WORKING MACHINE

Description

This application claims priority under 35 U.S.C. § 119 to Japanese Patent Application No. 2024-158849, filed on Sep. 13, 2024, which is incorporated by reference.

TECHNICAL FIELD

The present invention relates to a working machine.

BACKGROUND ART

Conventionally, a construction machine of Patent Document 1 is known as an example of a working machine. In the construction machine, an air intake duct, a heat exchanger, a fan shroud, a fan, an engine, and a hydraulic pump are arranged in an engine room in order from an upstream side in the flow direction of air. The engine is arranged below a seat stand on which an operator seat is arranged. Electric components such as a controller are arranged between the seat stand and the heat exchanger and above the fan shroud. That is, the controller is arranged on the heat exchanger side with respect to the engine.

PRIOR ART DOCUMENT

Patent Document

• • Patent Document 1: JP-A-2015-90050

SUMMARY OF INVENTION

Technical Problem

In recent years, in working machines, a plurality of electrical components have been electronically controlled to communicate with each other (electronic control has progressed). In the configuration in which the controller is arranged on the heat exchanger side with respect to the engine as in Patent Document 1, it is necessary to route a communication harness that connects the controller and other electrical components while bypassing the heat exchanger that is large and the fan. Therefore, the harness becomes long, and the routing thereof becomes difficult. In addition, in a case where the hydraulic pump arranged on a side opposite to the fan with respect to the engine is electronically controlled, it is necessary to route the harness connecting the controller and the hydraulic pump while bypassing the engine that is large. Therefore, the above problem that it is difficult to route the harness becomes more remarkable. Furthermore, when the controller is arranged between the seat stand and the heat exchanger, the heat exchanger becomes an obstacle in performing maintenance of the controller, which makes maintenance work difficult.

The present invention has been made to solve the above problem, and an object thereof is to provide a working machine that can facilitate routing of a harness connected to a controller and can facilitate maintenance work of the controller.

Solution to Problem

A working machine according to one aspect of the present invention is a working machine including: a hydraulic pump arranged on a first lateral side with respect to a prime mover in a machine room, a heat exchanger arranged on a second lateral side with respect to the prime mover in the machine room; and a bracket to which a controller is mounted, the bracket being arranged in the machine room to face a cover member that is detachably provided and forms a side wall of the machine room, wherein the bracket is arranged to be at least partially located on the first lateral side of the hydraulic pump and above the hydraulic pump in a rear view.

Advantageous Effects of Invention

According to the above configuration, the routing of the harness connected to the controller can be facilitated, and the maintenance work of the controller can be facilitated.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a left side view illustrating a schematic configuration of a hydraulic excavator which is an example of a working machine of the present invention;

FIG. 2 is a plan view of an upper turning body in a state where illustrations of working equipment and a cabin of the hydraulic excavator illustrated in FIG. 1 are omitted;

FIG. 3 is a schematic rear view of the upper turning body of FIG. 2;

FIG. 4 is a plan view schematically illustrating an internal configuration of a machine room when the hydraulic excavator is cut along a horizontal plane including line A-A of FIG. 1;

FIG. 5 is a rear view schematically illustrating the internal configuration of the machine room in a state where an illustration of a side wall of the machine room is omitted;

FIG. 6 is a perspective view of a seat support base and a support structure of the hydraulic excavator as viewed obliquely from the rear;

FIG. 7 is an exploded perspective view of the seat support base and the support structure;

FIG. 8 is a perspective view of the support structure as viewed obliquely from the rear; and

FIG. 9 is a perspective view of the support structure as viewed obliquely from the front.

DESCRIPTION OF EMBODIMENTS

An embodiment of the present invention will be described below with reference to the drawings.

1. Schematic Configuration of Working Machine

FIG. 1 is a left side view illustrating a schematic configuration of a hydraulic excavator 1 which is an example of a working machine according to an embodiment of the present invention. The hydraulic excavator 1 includes a lower traveling body 2, working equipment 3, and an upper turning body 4.

In the present embodiment, directions are defined as follows. A direction in which an operator (driver or manipulator) sitting on a driver's seat 44a arranged in a driving section 44 of an upper turning body 4 faces the front side is referred to as “front”, and the opposite direction thereof is referred to as “rear”. In a state where the upper turning body 4 is not turning with respect to a lower traveling body 2 (turning angle: 0 degree), a front-rear direction of the upper turning body 4 coincides with a front-rear direction of the lower traveling body 2. In the drawings, the hydraulic excavator 1 in a state where the upper turning body 4 is not turning with respect to the lower traveling body 2 is illustrated. In addition, a left side as viewed from the operator sitting on the driver's seat 44a is referred to as “left”, and a right side is referred to as “right”. Furthermore, a gravity direction perpendicular to the front-rear direction and the left-right direction is defined as an up-down direction, an upstream side in the gravity direction is defined as “up”, and a downstream side is defined as “down”. In the drawings, as necessary, the front is denoted by “F”, the rear is denoted by “B”, the right is denoted by “R”, the left is denoted by “L”, the upper side is denoted by “U”, and the lower side is denoted by “D”.

The lower traveling body 2 includes a pair of left and right crawlers 21, a pair of left and right traveling motors 22, and a blade 23. The left and right traveling motors 22 drive the left and right crawlers 21, respectively, so that the hydraulic excavator 1 can be moved forward and rearward. The traveling motor 22 is configured using a hydraulic motor. The blade 23 that performs ground leveling work and the like is provided on the front side of the lower traveling body 2. The blade 23 is rotated by a blade cylinder (not illustrated). The blade cylinder includes a hydraulic cylinder.

The working equipment 3 includes a boom 31, an arm 32, and a bucket 33. By independently driving the boom 31, the arm 32, and the bucket 33, excavation work of earth, sand and the like can be performed.

The boom 31 includes a lower boom 31a, an upper boom 31b, and an arm stay 31c. A proximal end portion of the lower boom 31a is connected to a right front portion 4a (see FIG. 2) of the upper turning body 4 so as to be rotatable in the up-down direction and the front-rear direction. A distal end portion of a boom cylinder (not illustrated) is connected to a distal end portion of the lower boom 31a. A proximal end portion of the boom cylinder is connected to the right front portion 4a of the upper turning body 4. More specifically, the boom cylinder is arranged on the front of the lower boom 31a. The boom cylinder is telescopically movable. When the boom cylinder extends and retracts, the lower boom 31a rotates in the up-down direction and the front-rear direction with respect to the upper turning body 4.

A proximal end portion of the upper boom 31b is connected to a distal end portion of the lower boom 31a so as to be rotatable in the left-right direction. The arm stay 31c is connected to a distal end portion of the upper boom 31b so as to be rotatable in the left-right direction. A proximal end portion of an offset cylinder 31b1 is connected to a left side surface of the proximal end portion of the upper boom 31b. A distal end portion of the offset cylinder 31b1 is connected to a left side surface of the arm stay 31c. The offset cylinder 31b1 is telescopically movable. The left side surface of the arm stay 31c and a left side surface of a distal end portion of the lower boom 31a are connected by a link rod 31b2.

When the offset cylinder 31b1 extends and retracts, the upper boom 31b rotates in the left-right direction with respect to the lower boom 31a, and the arm stay 31c moves (offsets) in the left-right direction. At this time, the arm stay 31c rotates in the left-right direction with respect to the upper boom 31b. Thus, the arm stay 31c moves in the left-right direction without rotating in the left-right direction with respect to the lower boom 31a.

A proximal end portion of the arm 32 is connected to the arm stay 31c so as to be rotatable in the up-down direction and the front-rear direction. A distal end portion of the arm cylinder 32a is connected to the proximal end portion of the arm 32. An intermediate portion between the distal end portion and a proximal end portion of the arm cylinder 32a is connected to the arm stay 31c. The arm cylinder 32a is telescopically movable. When the arm cylinder 32a extends and retracts, the arm 32 rotates in the up-down direction and the front-rear direction with respect to the arm stay 31c.

The bucket 33 is connected to the distal end portion of the arm 32 so as to be rotatable in the up-down direction and the front-rear direction. The bucket 33 is also connected to the arm 32 via a bucket link 34. A proximal end portion of the bucket cylinder 33a is connected to the proximal end portion of the arm 32. A distal end portion of the bucket cylinder 33a is connected to the bucket link 34. The bucket cylinder 33a is telescopically movable. When the bucket cylinder 33a extends and retracts, the bucket 33 rotates in the up-down direction and the front-rear direction with respect to the arm 32.

The boom cylinder, the offset cylinder 31b1, the arm cylinder 32a, and the bucket cylinder 33a are configured using hydraulic cylinders.

The upper turning body 4 is located above the lower traveling body 2 and is provided to be turnable with respect to the lower traveling body 2 via a turning bearing (not illustrated). The upper turning body 4 includes a turning frame 41, a turning motor 42, a machine room 43, a driving section 44, and a cabin 100. That is, the hydraulic excavator 1 includes the cabin 100.

The upper turning body 4 turns via the turning bearing by driving of the turning motor 42 arranged in the turning frame 41. The turning motor 42 is configured using a hydraulic motor.

The machine room 43 houses an engine EG. The engine EG is a prime mover serving as a drive source of the hydraulic excavator 1. The engine EG is configured using a diesel engine, but is not limited thereto, and may be configured using, for example, a gasoline engine.

The machine room 43 houses not only the engine EG but also a hydraulic pump P (see FIG. 4 and the like). The hydraulic pump P supplies hydraulic oil (pressure oil) to a hydraulic motor and a hydraulic cylinder. Examples of the hydraulic motor include the left and right traveling motors 22 and the turning motor 42. Examples of the hydraulic cylinder include the blade cylinder, the boom cylinder, the offset cylinder 31b1, the arm cylinder 32a, and the bucket cylinder 33a. The hydraulic motor and the hydraulic cylinder driven by the hydraulic oil are collectively referred to as a hydraulic actuator.

The driving section 44 is arranged on the upper left side of the upper turning body 4. More specifically, the driving section 44 is arranged adjacent left to the working equipment 3. The driver's seat 44a is provided in the driving section 44. A plurality of operation members 44b are arranged around the driver's seat 44a. The plurality of operation members 44b include a lever, a switch, a pedal, and the like. The hydraulic actuator is driven when the operator sits on the driver's seat 44a and operates the plurality of operation members 44b. Thus, it is possible to perform traveling of the lower traveling body 2, ground leveling work by the blade 23, excavation work by the working equipment 3, turning of the upper turning body 4, and the like.

The cabin 100 is arranged to cover the driving section 44. That is, the cabin 100 is arranged on the upper left side of the upper turning body 4. The working equipment 3 is arranged on the right side of the cabin 100 in the upper turning body 4. In the cabin 100, a door 100D is arranged on the left front of the driver's seat 44a. The operator can get on and off the driving section 44 by opening and closing the door 100D.

2. Detailed Configuration of Upper Turning Body

FIG. 2 is a plan view of the upper turning body 4 in a state where illustrations of the working equipment 3 and the cabin 100 illustrated in FIG. 1 are omitted. FIG. 3 is a schematic rear view of the upper turning body 4 illustrated in FIG. 2. The driver's seat 44a arranged in the driving section 44 of the upper turning body 4 is supported from below by a seat support base 43S. That is, the hydraulic excavator 1 includes the seat support base 43S that supports the driver's seat 44a. The seat support base 43S is configured by connecting a plurality of metal plates in a staircase shape from a lower front portion to an upper rear portion of the driver's seat 44a (see FIG. 7).

The driving section 44 is provided with, as the operation members 44b, a right operation lever 44b1, a left operation lever 44b2, a function restriction lever 44b3, a pair of traveling levers 44b4, and a plurality of pedals 44b5.

The right operation lever 44b1 is supported by a right control box 45R arranged on the right side of the driver's seat 44a. The left operation lever 44b2 and the function restriction lever 44b3 are supported by a left control box 45L arranged on the left side of the driver's seat 44a. The function restriction lever 44b3 is a lever configured to switch on and off of driving of the hydraulic actuator, and is provided to restrict the function of the hydraulic actuator as necessary. The pair of traveling levers 44b4 and the plurality of pedals 44b5 are arranged in front of the driver's seat 44a.

An air conditioner 50 is arranged on the right front side of the driver's seat 44a on a floor 44F of the driving section 44. Devices necessary for air conditioning (air temperature adjustment), such as an evaporator, a blower, and a heater core, are arranged inside the air conditioner 50. In the seat support base 43S, an outdoor unit 54 is arranged behind the driver's seat 44a. The outdoor unit 54 includes a compressor that compresses a refrigerant, a condenser configured to perform heat exchange, and the like. The refrigerant is circulated between the air conditioner 50 and the outdoor unit 54 to perform heat exchange in each of the evaporator of the air conditioner 50 and the condenser of the outdoor unit 54, whereby the air (inside air) in the cabin 100 or the air (outside air) taken into the air conditioner 50 from the outside is cooled. The blower is driven to blow cold air from a vent of the air conditioner 50 into the cabin 100. On the other hand, cooling water increased in temperature in the engine EG is circulated through the heater core, and air is blown to the heater core, whereby hot air is blown into the cabin 100 from the vent.

The monitor 60 is arranged above the air conditioner 50. The monitor 60 is a display device that displays various types of information. For example, the monitor 60 displays various settings in the hydraulic excavator 1, a remaining amount of fuel, an hour meter, an image captured by a monitoring camera when the monitoring camera is mounted, and the like. The monitor 60 is supported by a beam (not illustrated) protruding leftward from a right side wall of the cabin 100, for example.

A control valve CV is arranged below the floor 44F of the driving section 44. The control valve CV is an assembly of direction switching valves corresponding to the respective hydraulic actuators. The direction switching valve controls a flow direction and a flow rate of hydraulic oil supplied to the corresponding hydraulic actuator. In the present embodiment, an electromagnetic type is adopted as a control system of the control valve CV (each of the direction switching valves). That is, the flow direction and the flow rate of the hydraulic oil supplied from the hydraulic pump P (see FIG. 4 and the like) to the hydraulic actuator are controlled by outputting a control signal from a controller 70 (see FIG. 4 and the like) described later to an electromagnetic proportional valve of the control valve CV.

In the seat support base 43S, a communication unit 43a is arranged on the right side of the outdoor unit 54. The communication unit 43a includes an antenna and a positioning unit, and is provided for communication with the outside and measurement of an own vehicle position. In the seat support base 43S, a lamp 43b is provided on the further right side of the communication unit 43a. The lamp 43b is turned on at the time of operating the hydraulic excavator 1 or warning the surroundings, for example, to call attention of the surroundings. On the further right side of the lamp 43b in the seat support base 43S, an opening/closing cover 43c is connected so as to open forward and be rotatable in the up-down direction. When the opening/closing cover 43c is rotated upward to be opened, for example, an internal fuel tank can be accessed, and the fuel tank can be replenished with fuel.

As illustrated in FIG. 3, the machine room 43 is provided with a right side portion cover 43R, a rear portion cover 43B, a left side portion cover 43L, and a left lower portion cover 43LU. The right side portion cover 43R is a cover member that forms a right side wall of the machine room 43. The right side portion cover 43R is provided with an opening 43Rp. The opening 43Rp is provided to allow air to flow between the inside and the outside of the machine room 43. The air is sent to a heat exchanger HE (see FIGS. 4 and 5) described later to cool the cooling water passing through the heat exchanger HE, whereby the engine EG can be cooled. For example, a guard having a mesh shape is provided in the opening 43Rp as a safety measure, but the shape of the guard is not limited to the mesh shape.

The rear portion cover 43B is a cover member that forms a rear wall of the machine room 43. A counterweight 43W for weight balancing with the working equipment 3 is attached below the rear portion cover 43B. The left side portion cover 43L is a cover member that forms a left side wall of the machine room 43. The left lower portion cover 43LU is a cover member that forms a side wall below the left side portion cover 43L. The right side portion cover 43R, the left side portion cover 43L, and the left lower portion cover 43LU are detachably provided in the machine room 43 with bolts or the like. The rear portion cover 43B is provided in a rear portion of the machine room 43 so as to open rightward and be rotatable, for example, but may be detachably provided with a bolt or the like.

3. Internal Configuration of Machine Room

FIG. 4 is a plan view schematically illustrating an internal configuration of the machine room 43 when the hydraulic excavator 1 is cut along a horizontal plane including line A-A of FIG. 1. The line A-A passes through the engine EG. FIG. 5 is a rear view schematically illustrating the internal configuration of the machine room 43 in a state where an illustration of the side wall of machine room 43 is omitted. In FIG. 5, the outer shape of the left side portion cover 43L is indicated by a two-dot chain line for convenience.

As illustrated in FIGS. 4 and 5, the hydraulic pump P is arranged on the left side of the engine EG in the machine room 43. On the other hand, the heat exchanger HE is arranged on the right side of the engine EG in the machine room 43. The heat exchanger HE includes a radiator and an oil cooler.

The radiator is a first heat exchanger connected to a water jacket of the engine EG via a pipe, and cools the refrigerant passing through the water jacket. The refrigerant is cooled by heat exchange in the radiator, and the refrigerant is supplied from the radiator to the engine EG (water jacket), whereby the engine EG can be cooled. The refrigerant is, for example, cooling water.

The oil cooler is a second heat exchanger connected to an oil passage circulating through the above-described hydraulic pump P, the hydraulic actuator, and the like. The oil cooler cools, by heat exchange, the hydraulic oil flowing through the oil passage by driving of the hydraulic pump P. The oil cooler is arranged side by side with the radiator, for example, in the front-rear direction. The oil cooler may be arranged to at least partially overlap with the radiator.

A fan F (see FIG. 4) is arranged between the engine EG and the heat exchanger HE. Rotational power of a crankshaft of the engine EG is transmitted to the fan F via a fan belt and a fan pulley. Thus, the fan F is rotationally driven.

When the fan F is driven, the fan F blows air toward the heat exchanger HE. More specifically, by driving of the fan F, for example, air is taken into the machine room 43 from a ventilation hole (not illustrated) provided in the turning frame 41 (see FIG. 1), and the taken air flows toward the heat exchanger HE. Thus, the heat exchanger HE is cooled. In other words, the refrigerant (cooling water) flowing through the radiator of the heat exchanger HE is cooled, and the hydraulic oil flowing through the oil cooler is cooled.

The air having cooled the heat exchanger HE flows through a gap of the heat exchanger HE or along the surface of the heat exchanger HE toward the opening 43Rp (see FIG. 3), and is released from the opening 43Rp to the outside of the machine room 43. A system that cools the heat exchanger HE by such a flow of cooling air is referred to as a “discharge type”. Note that the fan F may be driven to take air from the opening 43Rp into the machine room 43, and the taken air may be sent to the heat exchanger HE to cool the heat exchanger HE. A system that cools the heat exchanger HE by such a flow of cooling air is referred to as a “suction type”.

The periphery of the fan F is covered by a housing CA. The housing CA is a fan shroud having openings on the heat exchanger HE side and the engine EG side. The cooling air generated by driving of the fan F passes through the inside of the housing CA, and flows from the engine EG side toward the heat exchanger HE side, for example.

From the above, the hydraulic excavator 1 according to the present embodiment can be expressed as follows with the left side and the right side of the engine EG serving as the prime mover as a “first lateral side” and a “second lateral side”, respectively. That is, the hydraulic excavator 1 includes the hydraulic pump P arranged on the first lateral side with respect to the prime mover in the machine room 43, and the heat exchanger HE arranged on the second lateral side with respect to the prime mover in the machine room 43.

In the machine room 43, a bracket BR is arranged on the left side of the engine EG. Thus, the bracket BR faces the left side portion cover 43L in the machine room 43. The bracket BR is configured using, for example, a metal plate, and is supported by a left support frame 81 (see FIGS. 6 to 9) in the machine room 43. A method for supporting the bracket BR will be described later in detail.

A first controller 70a is mounted on the bracket BR. The first controller 70a is a type of the controller 70. The first controller 70a is a controller for electrical control, and is configured using, for example, an electronic control unit also called an electronic control unit (ECU). For example, the first controller 70a electronically controls the hydraulic pump P and the control valve CV (see FIG. 4).

The first controller 70a is mounted on a first surface BR1 which is one surface of the bracket BR. The first surface BR1 is a surface on the first lateral side of the bracket BR, that is, a surface on a side facing the left side portion cover 43L (a side opposite to the side facing the hydraulic pump P). As described above, the hydraulic excavator 1 includes the bracket BR which is arranged in the machine room 43 so as to face the detachable cover member (the left side portion cover 43L) forming the side wall of the machine room 43, and to which the controller 70 (particularly, the first controller 70a) is mounted.

In the machine room 43, a second controller 70b is further arranged. Similarly to the first controller 70a, the second controller 70b is a type of the controller 70, and is configured using, for example, an ECU. The second controller 70b is an integrated controller that controls electric components (for example, the monitor 60 in FIG. 2) arranged inside the hydraulic excavator 1 and controls the hydraulic pump P and the like by integrating with the first controller 70a.

The second controller 70b is mounted to an attachment stay ST. The attachment stay ST is fixed to a front wall 43S1 extending upward from a lower front portion of the driver's seat 44a in the seat support base 43S. Thus, the second controller 70b is arranged on the first lateral side of the hydraulic pump P and in front of the bracket BR.

In the machine room 43, a third controller 70c is further arranged. Similarly to the first controller 70a and the second controller 70b, the third controller 70c is a type of the controller 70 and is configured using, for example, an ECU. The third controller 70c is mounted on a second surface BR2 which is another surface of the bracket BR. The second surface BR2 is a surface of the bracket BR on a side opposite to the first surface BR1, that is, a surface on the side facing the hydraulic pump P.

The third controller 70c is a controller for machine guidance or machine control. The third controller 70c is an optional controller. That is, the third controller 70c is mounted as necessary.

For example, when a sensor for posture detection is attached to a predetermined position (for example, the arm 32) of the working equipment 3, the third controller 70c can display guidance on the monitor 60 (see FIG. 2) based on a detection result of the sensor. Thus, the operator can operate the operation member 44b such that the bucket 33 is at a desired position based on the guidance displayed on monitor 60. In this case, the machine guidance for guiding the operation of the working equipment 3 is achieved. In addition, when position information of a blade edge of the bucket 33 is detected by the sensor, the third controller 70c can achieve the machine control based on the position information. In the machine control, the working equipment 3 is automatically operated by the third controller 70c based on the position information such that the blade edge of the bucket 33 is at a desired position.

In the present embodiment, as illustrated in FIG. 5, the bracket BR is arranged such that a part thereof is located on the left side of the hydraulic pump P and above the hydraulic pump P in a rear view of the hydraulic excavator 1. In the rear view of the hydraulic excavator 1, the entire bracket BR may be arranged on the left side of the hydraulic pump P and above the hydraulic pump P. That is, the bracket BR may be arranged to be at least partially located on the first lateral side of the hydraulic pump P and above the hydraulic pump P in the rear view.

In the machine room 43, the first lateral side on which the hydraulic pump P is arranged with respect to the engine EG can easily ensure a larger free space than the second lateral side on which the heat exchanger HE is arranged with respect to the engine EG. This is because the heat exchanger HE, the fan F, and the housing CA that occupy a large space in the machine room 43 are arranged on the second lateral side with respect to the engine EG.

In the machine room 43, at least a part of the bracket BR is arranged on the first lateral side of the hydraulic pump P in the rear view, so that the bracket BR can be arranged by effectively utilizing a large free space on the first lateral side of the hydraulic pump P in the machine room 43. Moreover, since at least a part of the bracket BR is located above the hydraulic pump P, as illustrated in FIG. 5, a space for routing of the harness HN connecting the controller 70 (for example, the first controller 70a) mounted on the bracket BR and the hydraulic pump P can be easily ensured on the first lateral side of the hydraulic pump P and below the bracket BR. This facilitates the routing of the harness HN.

Moreover, with the above arrangement of the bracket BR, the first controller 70a can be arranged at a position close to the hydraulic pump P. Thus, the first controller 70a and the hydraulic pump P can be connected by the harness HN that is short. Therefore, it is not necessary to route the harness HN while greatly bypassing the heat exchanger HE or the engine EG, and the routing of the harness HN is facilitated also in this respect.

Furthermore, the bracket BR is arranged to face the left side portion cover 43L that is the cover member forming the side wall of the machine room 43. Thus, the operator (maintenance person) can easily access the first controller 70a to perform maintenance by removing the left side portion cover 43L. In addition, maintenance can also be performed by removing the first controller 70a together with the bracket BR. In any case, the maintenance work of the first controller 70a can be facilitated since the bracket BR is arranged to face the left side portion cover 43L.

As illustrated in FIG. 4, the first controller 70a is arranged on the left side of the hydraulic pump P in a plan view, that is, the controller 70 (particularly, the first controller 70a) is arranged on the first lateral side of the hydraulic pump P in the plan view.

In this case, the first controller 70a can be arranged by effectively utilizing the space on the first lateral side of the hydraulic pump P. In addition, as illustrated in FIG. 4, the other controllers 70 (the second controller 70b and the third controller 70c) can be collectively arranged on the first lateral side of the hydraulic pump P, in addition to the first controller 70a. As a result, the harness connected to each of the controllers 70 can be easily designed and routed.

The bracket BR is desirably arranged to be inclined with respect to the front-rear direction from the viewpoint of easily ensuring a space for arranging the other controllers 70 (the second controller 70b and the third controller 70c) on the first lateral side of the hydraulic pump P and on the front of the bracket BR in the machine room 43. More specifically, as illustrated in FIG. 4, the bracket BR is desirably arranged to be away from the hydraulic pump P from the rear toward the front in the plan view.

From the viewpoint of facilitating the routing of the harnesses connected to the first controller 70a and the second controller 70b, the first controller 70a and the second controller 70b are desirably arranged in a concentrated manner (collectively) on the first lateral side of the hydraulic pump P in the machine room 43. From the viewpoint of easily achieving such a concentrated arrangement, the second controller 70b is desirably arranged above the hydraulic pump P and in front of the bracket BR as illustrated in FIGS. 4 and 5. In particular, the second controller 70b is desirably arranged on the first lateral side of the hydraulic pump P in the plan view as illustrated in FIG. 4.

In order to support the first controller 70a and the third controller 70c with a small number of components, it is desirable to simultaneously support the first controller 70a and the third controller 70c with one bracket BR. In this respect, as in the present embodiment, the first controller 70a is desirably mounted on the first surface BR1 of the bracket BR, and the third controller 70c is desirably mounted on the second surface BR2 of the bracket BR.

4. Method for Supporting Bracket

Next, the method for supporting the bracket BR in the machine room 43 will be described. FIG. 6 is a perspective view of the seat support base 43S and a support structure 80 as viewed obliquely from the rear. FIG. 7 is an exploded perspective view of the seat support base 43S and the support structure 80 illustrated in FIG. 6. The support structure 80 is a structure that supports the seat support base 43S from below on the turning frame 41. The above-described bracket BR is supported by the support structure 80. Hereinafter, details of the support structure 80 will be described.

(4-1. Configuration of Support Structure)

FIG. 8 is a perspective view of the support structure 80 as viewed obliquely from the rear. FIG. 9 is a perspective view of the support structure 80 as viewed obliquely from the front. The support structure 80 includes a left support frame 81, a right support frame 82, and an upper frame 83.

The left support frame 81 is arranged on the first lateral side, that is, on the left side of the center in the left-right direction in the machine room 43 (see FIG. 4 and the like). The left support frame 81 includes a first upright portion 811, a second upright portion 812, and a connecting portion 813.

The first upright portion 811 is erected in the machine room 43. More specifically, the first upright portion 811 is erected on a left front support portion 91 on the turning frame 41. The left front support portion 91 is erected on the first lateral side (left side) of the turning frame 41 and at the center in the front-rear direction. The left front support portion 91 is, for example, fastened to the turning frame 41 with a bolt, but may be fixed by welding. The left front support portion 91 as well as the first upright portion 811 supports the front wall 43S1 of the seat support base 43S. Therefore, the left front support portion 91 constitutes a support base support portion that supports the seat support base 43S.

The second upright portion 812 is erected behind the first upright portion 811 in the machine room 43. More specifically, the second upright portion 812 is erected at an intersection of a left vertical plate 92 and a horizontal plate 93 on the turning frame 41. The second upright portion 812 is, for example, fastened to the intersection with a bolt, but may be fixed by welding. The horizontal plate 93 is erected in a rear portion of the turning frame 41 and extends in the left-right direction. The left vertical plate 92 is erected on the right side of the first upright portion 811 in the turning frame 41 and extends forward from a left end portion of the horizontal plate 93. The left vertical plate 92 and the horizontal plate 93 are provided for the purpose of enhancing the rigidity of the turning frame 41 with respect to the weight of the working equipment 3. The left vertical plate 92 and the horizontal plate 93 are provided on the turning frame 41 by welding, for example. The second upright portion 812 extends upward more than the first upright portion 811.

The connecting portion 813 connects the first upright portion 811 and the second upright portion 812. More specifically, the connecting portion 813 is connected to a first upper end portion 811a (see FIG. 9) which is an upper end of the first upright portion 811 and an intermediate portion 812H in the up-down direction of the second upright portion 812. The intermediate portion 812H is located between a second upper end portion 812a which is an upper end of the second upright portion 812 and a second lower end portion 812b which is a lower end of the second upright portion 812. Note that a position of the intermediate portion 812H in the up-down direction is not particularly limited. For example, the intermediate portion 812H may be located in the middle between the second upper end portion 812a and the second lower end portion 812b, may be located on a side closer to the second upper end portion 812a than the middle portion, or may be located on a side closer to the second lower end portion 812b than the middle portion.

In the present embodiment, the connecting portion 813 is configured integrally with the first upright portion 811, but may be configured as a separate member from the first upright portion 811 and connected to the first upright portion 811. In addition, the connecting portion 813 is fastened to the second upright portion 812 with a bolt at the intermediate portion 812H, but may be configured integrally with the second upright portion 812. The first upright portion 811 and the second upright portion 812 are bridged by the connecting portion 813 in the front-rear direction (strictly, in an oblique direction with respect to the front-rear direction in the plan view).

The right support frame 82 is arranged on the second lateral side of the center in the left-right direction, that is, on the right side in the machine room 43. The right support frame 82 includes a first frame 821, a second frame 822, and a third frame 823.

The second frame 822 is erected at an intersection of the horizontal plate 93 and a right vertical plate 94 on the turning frame 41. The right vertical plate 94 is erected on the turning frame 41 and extends forward from a right end portion of the horizontal plate 93. Similarly to the left vertical plate 92 and the horizontal plate 93, the right vertical plate 94 is also provided for the purpose of enhancing the rigidity of the turning frame 41 with respect to the weight of the working equipment 3. The right vertical plate 94 is provided on the turning frame 41 by welding, for example.

The first frame 821 is arranged on the front of the second frame 822 in the machine room 43. The first frame 821 is fixed to a side surface of the right vertical plate 94 with a bolt or the like. The third frame 823 is connected to an upper end of the first frame 821, extends rearward, and is connected to an upper end of the second frame 822. In the present embodiment, the third frame 823 is configured integrally with the first frame 821, but may be configured as a member separate from the first frame 821 and connected to the first frame 821. In addition, the third frame 823 is connected to the second frame 822 via a connecting stay 824, but may be configured integrally with the second frame 822. The third frame 823 bridges the first frame 821 and the second frame 822 in the front-rear direction.

The upper frame 83 is connected to an upper end of the left support frame 81 (the second upper end portion 812a of the second upright portion 812) and an upper end (the connecting stay 824) of the right support frame 82 by welding or the like. The upper frame 83 extends in the left-right direction. As illustrated in FIG. 7, the upper frame 83 is fastened to a lower surface of the seat support base 43S with bolts or the like. Thus, the seat support base 43S is supported by the support structure 80.

(4-2. Method for Supporting Bracket)

As illustrated in FIGS. 6 to 9, the above-described bracket BR is fixed to the first upright portion 811 and the connecting portion 813 of the left support frame 81. The bracket BR is fixed to the first upright portion 811 and the connecting portion 813 by bolt fastening, for example. The bracket BR may be fixed by a method other than the bolt fastening. Since the bracket BR is fixed to members (the first upright portion 811 and the connecting portion 813) that support the seat support base 43S in this manner, the bracket BR is stably supported in the machine room 43.

In particular, a front edge BR-f of the bracket BR is fixed to the first upright portion 811 in the present embodiment, as illustrated in FIG. 8. In addition, an upper edge BR-u of the bracket BR is fixed to the connecting portion 813. In such a method for fixing the bracket BR, since the bracket BR is arranged to extend downward with respect to the connecting portion 813, a free space below the connecting portion 813 is effectively utilized as a space for arranging the bracket BR and the controller 70. Moreover, since the front edge BR-f of the bracket BR is fixed to the first upright portion 811, the bracket BR is stably supported even when the bracket BR is hung and supported on the connecting portion 813 as illustrated in FIG. 8 and the like.

From the viewpoint of reliably arranging the controller 70 in a free space below the connecting portion 813, the controller 70 is desirably arranged as follows. That is, as illustrated in FIG. 8, the controller 70 (for example, the first controller 70a) is desirably arranged below the upper edge BR-u of the bracket BR.

In addition, from the viewpoint of effectively utilizing a free space between the first upright portion 811 and the second upright portion 812, the controller 70 is desirably arranged as follows. That is, the controller 70 (for example, the first controller 70a) is desirably arranged between the first upright portion 811 and the second upright portion 812.

In particular, as illustrated in FIGS. 8 and 9, the bracket BR is desirably fixed to the first upright portion 811 and the connecting portion 813 to be separated from the second upright portion 812 (forward). This is because of the following reasons. In the configuration in which the bracket BR is arranged to be separated from the second upright portion 812, a gap GP is formed between the bracket BR and the second upright portion 812. Therefore, it is possible to access the second surface BR2 side from the first surface BR1 side of the bracket BR via the gap GP by removing the left side portion cover 43L (see FIG. 5 and the like). Therefore, it is easy to perform maintenance on another controller 70 (the third controller 70c in the present embodiment) when the another controller 70 is mounted on the second surface BR2 side of the bracket BR.

In the present embodiment, as described above, the connecting portion 813 of the left support frame 81 is connected to the first upper end portion 811a of the first upright portion 811 and the intermediate portion 812H of the second upright portion 812. Since the bracket BR is fixed to the left support frame 81 having such a configuration, the arrangement of the bracket BR utilizing the support structure 80 including the left support frame 81 is achieved in the machine room 43.

In particular, the left support frame 81 of the support structure 80 that supports the seat support base 43S includes the first upright portion 811, the second upright portion 812, and the connecting portion 813 as described above. With such a configuration of the left support frame 81, the bracket BR can be fixed to the first upright portion 811 and the connecting portion 813 as described above. Therefore, the above-described configuration of the left support frame 81 is effective in that it is reliably possible to effectively utilize the left support frame 81 not only as a frame that supports the seat support base 43S but also as a frame that supports the bracket BR.

5. Supplementary Note

Although the configuration in which the hydraulic excavator 1 includes the cabin 100 has been described in the present embodiment, a configuration in which a canopy is provided instead of the cabin 100 may be adopted.

The hydraulic excavator 1 may have a configuration in which a hydraulic device such as a hydraulic actuator (for example, a hydraulic motor and a hydraulic cylinder) and an actuator driven by electric power are used in combination. Examples of the actuator driven by electric power include an electric traveling motor, an electric cylinder, and an electric turning motor.

Although the hydraulic excavator 1 includes the engine EG (see FIG. 1) as a prime mover, the prime mover may be an electric motor.

Although the hydraulic excavator 1 has been described as an example of the working machine in the present embodiment, the working machine is not limited to the hydraulic excavator 1, and may be a construction machine such as a mobile crane. In addition, the working machine may be an agricultural machine such as a combine harvester or a tractor.

6. Additional Note

The working machine described in the present embodiment can be expressed as in the following additional notes.

A working machine according to Additional Note (1) includes:

• • a hydraulic pump arranged on a first lateral side with respect to a prime mover in a machine room,
  • a heat exchanger arranged on a second lateral side with respect to the prime mover in the machine room; and
  • a bracket to which a controller is mounted, the bracket being arranged in the machine room to face a cover member that is detachably provided and forms a side wall of the machine room,
  • in which the bracket is arranged to be at least partially located on the first lateral side of the hydraulic pump and above the hydraulic pump in a rear view.

A working machine according to Additional Note (2) is the working machine according to Additional Note (1), in which the controller is arranged on the first lateral side of the hydraulic pump in a plan view.

A working machine according to Additional Note (3) is the working machine according to Additional Note (1) or (2), in which the bracket is arranged to be away from the hydraulic pump from the rear toward the front in a plan view.

A working machine according to Additional Note (4) is the working machine according to any one of Additional Notes (1) to (3), further including:

• • a first upright portion erected in the machine room;
  • a second upright portion erected on rear of the first upright portion in the machine room; and
  • a connecting portion that connects the first upright portion and the second upright portion,
  • in which the bracket is fixed to the first upright portion and the connecting portion.

A working machine according to Additional Note (5) is the working machine according to Additional Note (4), in which

• • a front edge of the bracket is fixed to the first upright portion, and
  • an upper edge of the bracket is fixed to the connecting portion.

A working machine according to Additional Note (6) is the working machine according to Additional Note (5), in which the controller is arranged below the upper edge of the bracket.

A working machine according to Additional Note (7) is the working machine according to any one of Additional Notes (4) to (6), in which the controller is arranged between the first upright portion and the second upright portion.

A working machine according to Additional Note (8) is the working machine according to Additional Note (7), in which the bracket is fixed to the first upright portion and the connecting portion to be separated from the second upright portion.

A working machine according to Additional Note (9) is the working machine according to any one of Additional Notes (4) to (8), in which

• • the second upright portion extends upward more than the first upright portion, and
  • the connecting portion is connected to an upper end portion of the first upright portion and an intermediate portion in an up-down direction of the second upright portion.

A working machine according to Additional Note (10) is the working machine according to any one of Additional Notes (4) to (9), further including:

• • a seat support base that supports a driver's seat; and
  • a support frame that supports the seat support base,
  • in which the support frame includes the first upright portion, the second upright portion, and the connecting portion.

A working machine according to Additional Note (11) is the working machine according to any one of Additional Notes (1) to (10), further including, when the controller is a first controller, a second controller arranged in the machine room,

• • in which the second controller is arranged above the hydraulic pump and in front of the bracket.

A working machine according to Additional Note (12) is the working machine according to Additional Note (11), in which the second controller is arranged on the first lateral side of the hydraulic pump in a plan view.

A working machine according to Additional Note (13) is the working machine according to any one of Additional Notes (1) to (12), further including, when the controller is a first controller, a third controller arranged in the machine room, in which the first controller is mounted on one surface of the bracket, and the third controller is mounted on another surface of the bracket.

Although the embodiment of the present invention has been described above, the scope of the present invention is not limited thereto, and may be expanded or modified without departing from the gist of the invention.

INDUSTRIAL APPLICABILITY

The present invention is applicable to working machines such as construction machines and agricultural machines.

LIST OF REFERENCE SIGNS

• • 1 Hydraulic excavator (working machine)
  • 43 Machine room
  • 43L Left side portion cover (cover member)
  • 43S Seat support base
  • 44a Driver's seat
  • 70 Controller
  • 70a First controller
  • 70b Second controller
  • 70c Third controller
  • 72 Control valve
  • 81 Left support frame (support frame)
  • 811 First upright portion
  • 811a First upper end portion
  • 812 Second upright portion
  • 812H Intermediate portion
  • 812a Second upper end portion
  • 812b Second lower end portion
  • 813 Connecting portion
  • BR Bracket
  • BR-f Front edge
  • BR-u Upper edge
  • BR1 First surface (one surface of bracket)
  • BR2 Second surface (another surface of the bracket)
  • EG Engine (prime mover)
  • HE Heat exchanger
  • P Hydraulic pump