WORK MACHINE

Description

TECHNICAL FIELD

The present invention relates to a working machine. The present application claims priority based on Japanese Patent Application No. 2023-142855 filed on Sep. 4, 2023, the entire contents of which are incorporated herein by reference.

BACKGROUND ART

Patent Literature 1 discloses a backhoe as the working machine. The backhoe includes, as a working device, an arm device extending from a machine body, and a bucket attached to a tip of the arm device. The arm device includes a boom (first arm) located on the machine body side, and an arm (second arm) to which the bucket is attached. The boom, the arm, and the bucket operate by hydraulic pressure. Therefore, the machine body has a hydraulic unit, and the arm device has a plurality of hydraulic cylinders. The hydraulic unit and each hydraulic cylinder are connected by hydraulic pipe. The hydraulic pipe includes a hose having flexibility.

CITATION LIST

Patent Literature

PATENT LITERATURE 1: Japanese Laid-Open Patent Publication No. 2015-10386

SUMMARY OF THE INVENTION

A working machine according to one aspect of the present disclosure includes a machine body and an arm device, in which

• • the arm device includes: a first arm; a second arm configured to swing about a central axis with respect to the first arm; an angle detector configured to detect an angle formed by the first arm and the second arm; a protection portion configured to protect the angle detector; and a hose provided at a coupling portion between the first arm and the second arm,
  • the angle detector includes: a detection body provided on the first arm side; and a lever coupled to the detection body and a member on the second arm side and displaced in accordance with relative swing between the first arm and the second arm,
  • the protection portion includes: a cover configured to cover a displacement region of the lever; and
  • a guide configured to cover the detection body, the guide having a contour shape as viewed from a direction along the central axis smaller than a contour shape of the cover and being disposed at a position overlapping the cover as viewed from a direction along the central axis, and
  • a passing region through which the hose passes is provided between the first arm or the second arm and the cover and outside the guide.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view illustrating an example of a working machine.

FIG. 2 is a perspective view of an arm device.

FIG. 3 is an explanatory view illustrating a coupling portion between a boom and an arm and a periphery of the coupling portion.

FIG. 4 is an explanatory view of a tip of the boom.

FIG. 5 is a perspective view of the tip of the boom illustrated in FIG. 4.

FIG. 6 is a perspective view illustrating the coupling portion between the boom and the arm and the periphery of the coupling portion.

FIG. 7 is an image view illustrating the tip of the boom excluding an outer wall of a cover.

FIG. 8 is a perspective view of the cover and a guide.

FIG. 9 is an explanatory view illustrating a modification of a protection portion.

DETAILED DESCRIPTION

Problems to be Solved by the Present Disclosure

An arm is swingable with respect to a boom and is attached to a tip of the boom. An arm device includes an angle detector (potentiometer) for detecting an angle formed by the boom and the arm.

The hydraulic pipe is provided along the boom and the arm, and a hose is provided across a coupling portion (joint portion) between the boom and the arm. When the arm swings with respect to the boom, the hose may be loose and approach the angle detector or the like provided in the coupling portion. The hose is disposed to be curved in a large circle around the coupling portion as a center so as not to interfere with the angle detector, and the boom and the arm are positionally regulated by clamps.

Therefore, depending on an angle of the arm, the hose greatly protrudes, or many clamps are required to positionally regulate the hose, which complicates a configuration.

Therefore, an object of the present disclosure is to provide a working machine in which the hose is disposed more smartly than before.

advantageous Effect of the Present Disclosure

According to the working machine of the present disclosure, the hose is disposed more smartly than before.

Outline of Embodiments of the Present Disclosure

Hereinafter, an outline of embodiments of the present disclosure will be listed and described.

• • (1) A working machine according to an embodiment includes a machine body and an arm device, in which
    • the arm device includes: a first arm; a second arm configured to swing about a central axis with respect to the first arm; an angle detector configured to detect an angle formed by the first arm and the second arm; a protection portion configured to protect the angle detector; and a hose provided at a coupling portion between the first arm and the second arm,
    • the angle detector includes: a detection body provided on the first arm side; and a lever coupled to the detection body and a member on the second arm side and displaced in accordance with relative swing between the first arm and the second arm,
    • the protection portion includes: a cover configured to cover a displacement region of the lever; and
    • a guide configured to cover the detection body, the guide having a contour shape as viewed from a direction along the central axis smaller than a contour shape of the cover and being disposed at a position overlapping the cover as viewed from a direction along the central axis, and
    • a passing region through which the hose passes is provided between the first arm or the second arm and the cover and outside the guide.

According to the working machine having the above configuration, the hose can be positioned to be curved with a small radius around the detection body side of the angle detector. Since the guide is interposed between the hose and the detection body, the hose does not interfere with the detection body. A portion of the hose that is curved around the detection body and passes through the passing region is hidden by the cover. The hose is disposed more smartly than before.

• • (2) It is preferable that the guide has an outer peripheral surface having a contour shape viewed from a direction along the central axis being a shape along an arc, and the passing region is provided along the outer peripheral surface.

According to the above configuration, the guide having the outer peripheral surface having the shape along the arc is located inside the hose curved around the detection body.

• • (3) In the working machine of the above (1) or (2), it is preferable that the first arm has an arcuate end surface at a tip where the angle detector is provided, the end surface and the guide are positioned side by side in a direction parallel to the central axis, and the passing region is provided in a region between the second arm and the cover and outside the guide and the end surface.

In the case of the above configuration, the end surface at the tip of the first arm and the guide are positioned between the second arm and the cover. The hose passes outside one or both of the end surface and the guide.

• • (4) In the working machine according to any one of the above (1) to (3), it is preferable that the guide is integrated with the cover and the guide and the cover are detachable from the first arm.

According to the above configuration, the cover and the guide can be easily attached to the first arm, and the cover and the guide can be easily replaced.

• • (5) It is preferable that the working machine according to the above (4) includes a bracket for attaching the detection body to the first arm, in which the detection body is disposed inside an outer edge of the bracket when viewed from a direction along the central axis, and an inner peripheral surface of the guide faces an outer peripheral surface of the bracket.

According to the above configuration, even if a large force is applied to one or both of the cover and the guide or one or both of the cover and the guide are deformed by the force, the guide does not come into contact with the angle detector due to contact of the guide with the bracket, and thus the angle detector is hardly affected.

• • (6) In the working machine according to any one of the above (1) to (3), it is preferable that the first arm includes a bracket to which the detection body is attached, the guide is integrated with the bracket, and the cover is separate from the guide and the bracket.

In the case of the above configuration, the detection body is attached to the bracket, and the bracket and the guide are integrated. Even if the large force acts on the cover or the cover is deformed by the force, since the cover is separate from the guide and the bracket, the detection body is hardly affected.

• • (7) In the working machine according to any one of the above (1) to (5), the cover and the guide are preferably attached to the first arm side in a non-contact state with the angle detector.

According to the above configuration, even if the large force acts on one or both of the cover and the guide or one or both of the cover and the guide are deformed by the force, the angle detector is hardly affected.

• • (8) In the working machine according to any one of the above (1) to (6), it is preferable that the cover includes: an outer peripheral wall covering an outside of the displacement region of the lever; an outer wall connected to the outer peripheral wall and covering the angle detector from an outside in a machine body width direction; and an inner wall connected to the outer peripheral wall, disposed inside the outer wall in the machine body width direction, and facing the outer wall, and the inner wall is located outside in a machine body width direction of the hose passing through the passing region.

According to the above configuration, the outer wall covers and protects the angle detector from the outside in the machine body width direction. The outer peripheral wall covers and protects the angle detector from its outer peripheral side. The inner wall serves as a regulating member that prevents the hose passing through the passing region from being displaced outward in the machine body width direction.

• • (9) In the working machine of the above (8), it is preferable that the outer wall is provided over substantially an entire circumferential region around the detection body of the outer peripheral wall, the inner wall is provided corresponding to a circumferential part around the detection body of the outer peripheral wall, and the displacement region of the lever is included in a range in which the inner wall is not provided in the cover.

According to the above configuration, the outer wall widely covers and protects the angle detector having the detection body. The inner wall serves as a regulating member that prevents the hose passing through the passing region from being displaced outward in the machine body width direction, and the inner wall does not interfere with the lever displaced by the swing of the first arm and the second arm.

• • (10) In the working machine of the above (9), a circumferential length of the guide around the detection body is preferably longer than a circumferential length of the inner wall.

In this case, the guide is provided in a range as wide as possible between the hose and the detection body.

• • (11) In the working machine according to any one of the above (1) to (9), the cover preferably has an arc-shaped outer peripheral wall covering an outside of the displacement region of the lever formed in an arc shape around the central axis.

According to the above configuration, the cover has a shape suitable as a member that covers the displacement region of the lever formed in the arc shape from an outside.

Details of Embodiments of the Present Disclosure

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Note that at least some of the embodiments described below may be arbitrarily combined.

[Overall Configuration of Working Machine]

FIG. 1 is a perspective view illustrating an example of a working machine 10. The working machine 10 illustrated in FIG. 1 is a swivel working machine and is called a backhoe. The working machine 10 includes a machine body (turning table) 11, a traveling device 12, and a working device. The working device is an arm device 13. The arm device 13 includes a boom 31 that is a first arm and an arm 32 that is a second arm. Note that the working machine is not limited to the backhoe as long as the working machine includes the machine body 11 and the arm device 13 integrated with the machine body 11.

Directions of the working machine 10 are defined. A direction in which a driver correctly seated on a driver's seat 22 included in the working machine 10 faces is defined as “front”, and the opposite direction is defined as “rear”. In a state where the driver faces forward, a left side is defined as “left”, and a right side is defined as “right”. A front-rear direction and a left-right direction are orthogonal to each other. In the following description, the left-right direction is also referred to as a “machine body width direction”.

A direction orthogonal to both the front-rear direction and the machine body width direction is defined as an up-down direction. The up-down direction is also referred to as a height direction.

In each figure, orthogonal three-dimensional coordinates are shown, in which a front direction is indicated by an arrow X1 and a rear direction is indicated by an arrow X2. A left direction is indicated by an arrow Y1, and a right direction is indicated by an arrow Y2. An upper direction is indicated by an arrow Z1, and a lower direction is indicated by an arrow Z2.

A direction from a central portion in the machine body width direction toward the right or the left may be referred to as “outside in the machine body width direction”. The outside in the machine body width direction is a direction away from a center in the machine body width direction of the working machine 10. A direction opposite to the outside in the machine body width direction may be referred to as an inside in the machine body width direction. The inside in the machine body width direction is a direction approaching the center of the working machine 10, in the machine body width direction.

The arm device 13 swings about the central axis of the up-down direction (that is, swings left and right) with respect to the machine body 11. When describing parts of the arm device 13, it is assumed that the arm device 13 is in a state facing straight ahead without swinging left and right as illustrated in FIG. 1.

The machine body 11 includes a swivel frame 21 serving as a framework, and the driver's seat 22 mounted on the swivel frame 21 and on which the driver sits. In the case of the working machine 10 illustrated in FIG. 1, the machine body 11 has a cabin 23 surrounding the driver's seat 22. The machine body 11 may have a canopy instead of the cabin 23.

The working machine 10 includes a swivel bearing 14. The machine body 11 (swivel frame 21) is supported by the traveling device 12 via the swivel bearing 14. The swivel bearing 14 allows the machine body 11 to turn about the central axis of the up-down direction. The machine body 11 (swivel frame 21) turns hydraulically or electrically.

The machine body 11 includes a prime mover 24 mounted on the swivel frame 21 and a hydraulic device (hydraulic unit) 25. The prime mover 24 is a diesel engine. Note that he prime mover 24 may be a gasoline engine or an electric motor, or may be a hybrid type having the engine and the electric motor. Although not illustrated, the hydraulic device 25 includes a tank that stores hydraulic oil, a hydraulic pump, and a hydraulic circuit. The hydraulic device 25 generates a hydraulic pressure to operate a hydraulic actuator.

The traveling device 12 supports the machine body 11 in a travelable manner. The traveling device 12 illustrated in FIG. 1 is a crawler type device. The traveling device 12 includes a traveling frame 29, a first traveling device 28L provided on the left side of the traveling frame 29, and a second traveling device 28R provided on the right side of the traveling frame 29. Although not illustrated, the first traveling device 28L and the second traveling device 28R are driven by a traveling motor including a hydraulic motor (hydraulic actuator). Note that the traveling device 12 is not limited to the crawler type, and may be a wheel type.

The traveling device 12 illustrated in FIG. 1 includes a dozer device 27 located at a front portion thereof. Although not illustrated, the dozer device 27 is driven by the hydraulic cylinder (hydraulic actuator). The dozer device 27 may be omitted.

The machine body 11 includes a support bracket 15 and a swing bracket 16 at a front portion thereof. The support bracket 15 is provided to protrude forward from the machine body 11 (swivel frame 21). The swing bracket 16 is attached to a front portion of the support bracket 15 so as to be swingable about a central axis of the up-down direction. The swing bracket 16 swings by expansion and contraction of a swing cylinder (not illustrated) provided between the swing bracket and the machine body 11.

The arm device 13 is attached to the swing bracket 16. The arm device 13 includes the boom 31, the arm 32, and a bucket 33.

FIG. 2 is a perspective view of the arm device 13. The boom 31 is attached to the swing bracket 16 at a base portion 41 of the boom 31. The boom 31 is swingable about a central axis C0 of the machine body width direction and is supported by the swing bracket 16. A boom cylinder 34 is provided between the swing bracket 16 and the boom 31. The boom 31 swings with respect to the swing bracket 16 by expansion and contraction of the boom cylinder 34.

The arm 32 is attached to a tip 43 of the boom 31 at a base portion 51 of the arm 32. The arm 32 is swingable about a central axis C1 of the machine body width direction and is supported by the boom 31. An arm cylinder 35 is provided between the boom 31 and the arm 32. The arm 32 swings with respect to the boom 31 by expansion and contraction of the arm cylinder 35.

The bucket 33 is attached to a tip 53 of the arm 32. The bucket 33 is swingable about a central axis C2 of the machine body width direction and is supported by the arm 32. The bucket 33 can perform a scooping operation and a dumping operation. The scooping operation is an operation of swinging the bucket 33 in a direction of approaching the boom 31, and is, for example, an operation of scooping earth and sand. The dumping motion is a motion of swinging the bucket 33 in a direction away from the boom 31, and is, for example, an operation of dropping (discharging) the scooped earth and sand or the like. A bucket cylinder 36 is provided between the arm 32 and the bucket 33. The bucket 33 swings with respect to the arm 32 by expansion and contraction of the bucket cylinder 36.

The boom cylinder 34, the arm cylinder 35, the bucket cylinder 36, and the swing cylinder (not illustrated) are configured by hydraulic cylinders (hydraulic actuators). These hydraulic cylinders are operated by hydraulic pressure generated by the hydraulic device 25 (see FIG. 1) mounted on the machine body 11. In order to supply the hydraulic oil from the hydraulic device 25 to the hydraulic cylinders, the arm device 13 includes a plurality of hydraulic pipes 85 provided along the boom 31 and the arm 32.

The hydraulic pipe 85 includes pipes 81 and a hose 80. The pipes 81 are made of, for example, metal and are respectively fixed to the boom 31 and the arm 32 by clamps 82. The hose 80 has flexibility. The hose 80 is connected to the pipe 81 via a joint. The hose 80 (see FIG. 2) is provided across a coupling portion 37 between the boom 31 and the arm 32. The hose 80 is a part of the hydraulic pipe 85 for supplying the hydraulic oil to a service port SP to which various hydraulic actuators are connected. Note that the hose 80 may supply the hydraulic oil to the bucket cylinder 36 or the arm cylinder 35.

Instead of the bucket 33 or in addition to the bucket 33, another working tool (attachment) that can be driven by the hydraulic actuator can be attached to the arm device 13. Examples of other working tools include a hydraulic breaker, a hydraulic crusher, an angle broom, an earth auger, a pallet fork, a sweeper, a mower, and a snow blower.

[Configuration of Parts of Arm Device 13]

As described above, the arm device 13 includes the boom 31 and the arm 32 that swings with respect to the boom 31.

The boom 31 has the base portion 41, a boom body 42, and the tip 43. The base portion 41 is made of, for example, cast steel. The boom body 42 has, for example, a structure in which a plurality of steel plates are assembled by welding, and has a shape bent at an intermediate portion in the case of the present embodiment. The tip 43 is made of, for example, cast steel. The base portion 41 and the tip 43 are fixed to the boom body 42 by welding.

The arm 32 has the base portion 51, an arm body 52, and the tip 53. The arm 32 has a structure in which a plurality of steel plates are assembled by welding, and has a linear shape in the case of the present embodiment.

FIG. 3 is an explanatory view illustrating the coupling portion 37 between the boom 31 and the arm 32 and a periphery of the coupling portion. FIG. 4 is an explanatory view of the tip 43 of the boom 31. FIG. 4 illustrates a state in which the arm 32 is removed from the tip 43. The arm device 13 includes an angle detector 60 for detecting an angle formed by the boom 31 and the arm 32, and a protection portion 70 for protecting the angle detector 60. FIG. 3 and FIG. 4 illustrate a state in which the protection portion 70 is removed for the sake of description of the angle detector 60.

The tip 43 of the boom 31 (see FIG. 4) includes a tip body 430, a first frame 431, a second frame 432, and a pin 433. The tip 43 has a bifurcated shape divided into two from the tip body 430, and one of bifurcated portions is the first frame 431 and the other is the second frame 432. The pin 433 is attached to the first frame 431 and the second frame 432. The base portion 51 of the arm 32 is attached to the pin 433, and the arm 32 is swingable about the central axis C1 of the pin 433. The central axis C1 is a swing center line of the boom 31 and the arm 32.

The angle detector 60 is a rotary potentiometer, and includes a detection body 61 and a lever 62. The detection body 61 includes a columnar case 611 and a sensor 612 including a variable resistor or the like provided in the case 611. Although not illustrated, the sensor 612 has a rotation shaft, and one end 621 of the lever 62 is attached to the rotation shaft. A central axis of the rotation shaft coincides with an extension line of the central axis C1 of the pin 433. The sensor 612 detects displacement (rotation) of the lever 62.

The detection body 61 is provided at the tip 43 of the boom 31. In the case of the present embodiment, the boom 31 has a bracket 55, and the bracket 55 attaches the detection body 61 to the boom 31. The bracket 55 has a plate shape and is fixed to the tip 43 by a bolt 78. The detection body 61 is attached to the first frame 431 via the bracket 55.

The one end 621 of the lever 62 is coupled to the detection body 61 (the rotation shaft of the sensor 612), and the other end 622 of the lever 62 is coupled to a mounting member 56 provided in the arm 32 (see FIG. 3). The lever 62 is displaced about the central axis C1 in accordance with relative swing between the boom 31 and the arm 32. The angle detector 60 detects a displacement angle of the lever 62 as a swing angle between the boom 31 and the arm 32.

[Protection Portion 70]

FIG. 5 is a perspective view of the tip 43 of the boom 31 illustrated in FIG. 4 as viewed from an opposite side in the machine body width direction. The protection portion 70 includes a cover 71 and a guide 72 to protect the angle detector 60 (see FIG. 4, FIG. 5, and FIG. 8). FIG. 8 is a perspective view of the cover 71 and the guide 72. The cover 71 and the guide 72 are made of metal, and are configured by assembling thin plates.

The cover 71 of the present embodiment includes an outer peripheral wall 711, an outer wall 712 connected to the outer peripheral wall 711, and an inner wall 713 connected to the outer peripheral wall 711.

The outer peripheral wall 711 covers a region (displacement region K2) where the lever 62 is displaced by the relative swing between the boom 31 and the arm 32. The outer peripheral wall 711 has an outer peripheral surface having a shape along an arc. That is, the outer peripheral wall 711 is an arc wall having an arc shape. The outer peripheral wall 711 covers an outside of the displacement region K2 of the lever 62 formed in an arc shape around the central axis C1.

The outer wall 712 covers the angle detector 60 from the outside in the machine body width direction. That is, the outer wall 712 covers the angle detector 60 from a side opposite to the tip 43 (first frame 431) of the boom 31 in the machine body width direction.

The inner wall 713 is disposed inside the outer wall 712 in the machine body width direction. The inner wall 713 is connected to the outer wall 712 via the outer peripheral wall 711 and faces the outer wall 712.

The guide 72 is disposed at a position (an overlapping position) overlapping the cover 71 when viewed from a direction along the central axis C1. The guide 72 has a contour shape smaller than that of the cover 71 when viewed from the direction along the central axis C1. More specifically, the guide 72 has a contour shape smaller than the outer peripheral wall 711. In the case of the present embodiment, the guide 72 has an outer peripheral surface 72a having a smaller diameter than the outer peripheral wall 711 and having a contour shape along an arc when viewed from the direction along the central axis C1. The guide 72 covers the detection body 61. The protection portion 70 has a two-step shape with large and small outer peripheral contour shapes due to the outer peripheral wall 711 and the guide 72.

FIG. 6 is a perspective view illustrating the coupling portion 37 between the boom 31 and the arm 32 and the periphery of the coupling portion. An outside (outer peripheral side) of the guide 72 between the base portion 51 of the arm 32 and the cover 71 is a passing region K1 through which the hose 80 passes. The passing region K1 is an arcuate space centered on the detection body 61. The inner wall 713 (see FIG. 5) is located outside in the machine body width direction of the hose 80 passing through the passing region K1. A region between the inner wall 713 and the base portion 51 of the arm 32 is the passing region K1.

As described above, the outer wall 712 (see FIG. 4) covers and protects the angle detector 60 including the lever 62 from the outside in the machine body width direction. The outer peripheral wall 711 (see FIG. 5) covers and protects the angle detector 60 including a part of the lever 62 from its outer peripheral side. The inner wall 713 serves as a regulating member that prevents the hose 80 passing through the passing region K1 from being displaced outward in the machine body width direction.

The guide 72 serves as a contact plate with which the hose 80 can come into contact, and covers and protects the detection body 61. The guide 72 has a shape along an arc, and is located inside the hose 80 curved at the coupling portion 37 between the boom 31 and the arm 32. The guide 72 has a shape suitable as a member located inside the curved hose 80.

In the boom 31, the tip 43 provided with the angle detector 60 has the first frame 431 as described above (see FIG. 4 and FIG. 5). The first frame 431 has an arcuate end surface (a boom end surface 44) at its tip. That is, the boom 31 has an arcuate boom end surface 44 at the tip 43.

The boom end surface 44 and the guide 72 are positioned side by side in a direction parallel to the central axis C1 of the swing between the boom 31 and the arm 32 (see FIG. 7). FIG. 7 is an image view illustrating the tip 43 of the boom 31 excluding the outer wall 712 of the cover 71. In the case of the present embodiment, a radius of the arcuate boom end surface 44 and a radius of the outer peripheral surface 72a of the guide 72 having an arcuate shape are equal (substantially equal) to each other.

With this configuration, the guide 72 and the boom end surface 44 are positioned between the base portion 51 of the arm 32 and the cover 71. Therefore, the passing region K1 of the hose 80 is provided in a region between the base portion 51 of the arm 32 and the cover 71 and on the outside (outer peripheral side) of the guide 72 and the boom end surface 44. The hose 80 can pass through the outside of one or both of the guide 72 and the boom end surface 44.

Although not illustrated, the radius of the boom end surface 44 may be larger than that of the guide 72. For example, although not illustrated, the radius of the boom end surface 44 may be equal to (substantially equal to) that of the outer peripheral wall 711. In this case, the outside (outer peripheral side) of the guide 72 between the tip 43 (first frame 431) of the boom 31 and the cover 71 is the passing region K1 of the hose 80.

That is, the outside (outer peripheral side) of the guide 72 between the tip 43 of the boom 31 or the base portion 51 of the arm 32 and the cover 71 may be the passing region K1 of the hose 80.

The cover 71 (see FIG. 7) has an auxiliary wall 714 on a side opposite to the outer peripheral wall 711 with the detection body 61 as a center. The auxiliary wall 714 is connected to both ends of the outer peripheral wall 711. The detection body 61 is covered and protected in a wide range by the outer peripheral wall 711 and the auxiliary wall 714. A space surrounded by the outer peripheral wall 711 and the auxiliary wall 714 is closed by the outer wall 712 (see FIG. 4). As illustrated in FIG. 7, the auxiliary wall 714 has an opening 714a through which a signal line 79 connected to the sensor 612 of the detection body 61 passes. The opening 714a may contact the signal line 79. Therefore (see FIG. 8), a round bar 714b is provided as an edge guard at an edge of the opening 714a, and the opening 714a has a convex curved shape.

The outer wall 712 (see FIG. 4) is provided over substantially the entire circumferential region (along substantially the entire circumference) around the detection body 61 of the outer peripheral wall 711. The outer wall 712 widely covers and protects the angle detector 60 having the detection body 61.

On the other hand, the inner wall 713 (see FIG. 7) is provided corresponding to a part Q (along the part Q) in a circumferential direction around the detection body 61 of the outer peripheral wall 711.

The displacement region K2 of the lever 62 is included in a range where the inner wall 713 is not provided in the cover 71.

As described above, the inner wall 713 serves as a regulating member that prevents the hose 80 (see FIG. 5) passing through the passing region K1 from being displaced outward in the machine body width direction, and the inner wall 713 is provided at the part Q along the circumferential direction, and thus the inner wall 713 does not interfere with the lever 62 displaced by the swing of the boom 31 and the arm 32.

A circumferential length of the guide 72 around the detection body 61 is longer than a circumferential length of the inner wall 713. That is, the guide 72 is provided along the circumferential direction around the detection body 61 of the outer peripheral wall 711 in a range wider than the part Q where the inner wall 713 is provided. The guide 72 is provided in a range as wide as possible between the hose 80 and the detection body 61.

The protection portion 70 (see FIG. 8) has the guide 72 (first guide 72) and a second guide 73. The second guide 73 is provided on a side opposite to the inner wall 713 at an angle of approximately 180 degrees about the central axis C1 and at a position inside the cover 71 in the machine body width direction. The second guide 73 is separated from the first guide 72. A space between the first guide 72 and the second guide 73 is included in the displacement region K2 of the lever 62.

An outside (outer peripheral side) of the second guide 73 is a region through which the hose 80 can pass (see FIG. 5), and an outer region of the second guide 73 is continuous with the passing region K1. Since the second guide 73 may come into contact with the hose 80, the second guide 73 (see FIG. 8) is provided with a round bar 73a at its end as an edge guard, and an end of the second guide 73 has a convex curved shape.

In the case of the present embodiment (see FIG. 4, FIG. 5, FIG. 7, and FIG. 8), the guide 72 is integrated with the cover 71. That is, the guide 72 and the cover 71 are connected. The guide 72 is fixed along an inner peripheral edge of the inner wall 713, for example, by welding. The protection portion 70 integrally including the guide 72 and the cover 71 is attached to the tip 43 of the boom 31 by a bolt 75. By removing the bolt 75, the protection portion 70 is removed from the boom 31. That is, the protection portion 70 is detachable from the boom 31. With this configuration, the protection portion 70 (the cover 71 and the guide 72) can be easily attached to the boom 31, and the protection portion 70 can also be easily replaced.

The cover 71 is provided so as to cover the detection body 61 and the lever 62 of the angle detector 60. The cover 71 is attached to the tip 43 of the boom 31 with gaps between the cover 71 and the detection body 61 and between the cover 71 and the lever 62.

The guide 72 is provided so as to cover a part of a periphery of the detection body 61 of the angle detector 60 and the bracket 55. The guide 72 is provided at the tip 43 of the boom 31 with gaps between the guide 72 and the detection body 61 and between the guide 72 and the bracket 55.

In this manner, the cover 71 and the guide 72 are attached to the boom 31 side in a non-contact state with the angle detector 60. The detection body 61 (see FIG. 4) is disposed inside an outer edge (outer peripheral surface) 55a of the bracket 55 when viewed from the direction along the central axis C1. In addition, an inner peripheral surface 72b of the guide 72 (see FIG. 7) has a shape (an arc shape) along the outer edge (outer peripheral surface) 55a of the bracket 55, and the inner peripheral surface 72b of the guide 72 faces the outer peripheral surface 55a of the bracket 55.

With this configuration, even if a large force acts on one or both of the cover 71 and the guide 72 or one or both of the cover 71 and the guide 72 are deformed by the force, the guide 72 does not come into contact with the angle detector 60 due to contact of the guide 72 with the bracket 55, and thus the angle detector 60 is not affected.

FIG. 9 is an explanatory view illustrating a modification of the protection portion 70. In the case of the protection portion 70 illustrated in FIG. 9, the guide 72 is a separate body from the cover 71. That is, the guide 72 is separated from the cover 71. The guide 72 is fixed to the bracket 55 by welding or the like.

The cover 71 is attached to the tip 43 of the boom 31 by a first bolt 75. The bracket 55 integral with the guide 72 is attached to the tip 43 of the boom 31 by a second bolt 76. That is, the guide 72 is attached to the tip 43 of the boom 31 together with the bracket 55.

The detection body 61 is attached to the bracket 55 by a third bolt 77. When the second bolt 76 is removed, the guide 72 and the bracket 55 are integrally removed from the tip 43 of the boom 31 together with the detection body 61.

In a form illustrated in FIG. 9, the cover 71 is separate from the guide 72 and the bracket 55. Therefore, even if a large force acts on the cover 71 or the cover 71 is deformed by the force, the detection body 61 is hardly affected.

In the case of the form illustrated in FIG. 9, similarly to a form illustrated in FIG. 4, the cover 71 is provided so as to cover the detection body 61 and the lever 62 of the angle detector 60. The cover 71 is attached to the tip 43 of the boom 31 with gaps between the cover 71 and the detection body 61 and between the cover 71 and the lever 62.

The guide 72 is provided so as to cover a part of the periphery of the detection body 61. The guide 72 is provided at the tip 43 of the boom 31 with a gap between the guide 72 and the detection body 61.

In this manner, the cover 71 is attached to the boom 31 side in a non-contact state with the angle detector 60, and the guide 72 is attached to the boom 31 side in a non-contact state with the detection body 61. With this configuration, even if a large force acts on the cover 71 or the cover 71 is deformed by the force, the angle detector 60 is not affected.

[Working Machine 10 of the Present Embodiment]

As described above, the working machine 10 of the present embodiment (see FIG. 1) includes the machine body 11 and the arm device 13 integrated with the machine body 11. The arm device 13 (see FIG. 2 and FIG. 3) includes the boom (first arm) 31, the arm (second arm) 32 that swings about the central axis C1 with respect to the boom 31, the angle detector 60, the protection portion 70, and the hose 80. The angle detector 60 is a device for detecting the angle formed by the boom 31 and the arm 32. The protection portion 70 is a member that protects the angle detector 60. The hose 80 is provided at the coupling portion 37 between the boom 31 and the arm 32.

The angle detector 60 includes the detection body 61 provided on the boom 31 side, and the lever 62 coupled to the detection body 61 and the mounting member 56 on the arm 32 side. The lever 62 is displaced in accordance with the relative swing between the boom 31 and the arm 32.

The protection portion 70 (see FIG. 4 and FIG. 5) includes the cover 71 and the guide 72. The cover 71 covers the displacement region K2 of the lever 62. The guide 72 is smaller in contour shape than the cover 71 when viewed from the direction along the central axis C1, and is disposed at a position overlapping the cover 71 as viewed from the direction along the central axis C1, and covers the detection body 61.

In the case of the present embodiment (see FIG. 6), the outside of the guide 72 between the base portion 51 of the arm 32 and the cover 71 is the passing region K1 through which the hose 80 curved around the detection body 61 passes.

According to the working machine 10 having the above configuration, the hose 80 is positioned to be curved with a small radius around the detection body 61 of the angle detector 60 and is shortened. The hose 80 is disposed around the detection body 61 with a small radius near the detection body 61, and the guide 72 is interposed between the hose 80 and the detection body 61. Therefore, the hose 80 does not interfere with the detection body 61.

A portion of the hose 80 that is curved around the detection body 61 and passes through the passing region K1 is hidden by the cover 71. The hose 80 is disposed more smartly than before.

Since the hose 80 is short and disposed with a small radius, it is possible to reduce the number of clamps for fixing the hose 80 to the boom 31 or the arm 32.

The hose 80 may contact the guide 72. Even if the guide 72 is scratched or a coating film of the painted guide 72 is peeled off, the guide 72 is hidden by the cover 71. Therefore, appearance is not deteriorated.

The cover 71 covers the displacement region K2 of the lever 62 and the detection body 61 (see FIG. 5). Therefore, for example, even when the arm device 13 turns and the coupling portion 37 between the boom 31 and the arm 32 is likely to come into contact with a structure, the cover 71 comes into contact with the structure before the angle detector 60. In addition, the lever 62 and the detection body 61 do not directly contact the structure. Therefore, for example, deformation of the lever 62 can be prevented. The protection portion 70 prevents detection accuracy of the angle detector 60 from deteriorating and the angle detector 60 from being damaged.

The cover 71 is attached in a non-contact state with the detection body 61 and the lever 62 of the angle detector 60. Therefore, even if the cover 71 comes into contact with, for example, a structure and is deformed, the detection body 61 and the lever 62 are hardly affected. That is, it is possible to prevent a failure of the angle detector 60.

Even if the cover 71 is damaged, the cover 71 can be easily removed from the tip 43 of the boom 31 by means of the bolt 75, and the cover 71 can be easily replaced.

[Others]

In the above embodiment, the arm device 13 includes the first arm (boom 31) and the second arm (arm 32) as arms. The arm device 13 may include not only two arms but also three or four or more arms.

In a case where the arm device 13 includes, for example, three arms, the arm device 13 includes two coupling portions (joint portions). Then, two arms adjacent to each other with the coupling portion interposed therebetween relatively swing. In this case, the angle detector 60 is provided in the first arm which is one of the two adjacent arms. The lever 62 of the angle detector 60 is attached to a member provided in the second arm which is the other of the two adjacent arms. The angle detector 60 and the protection portion 70 are provided in each of the coupling portions. The protection portion 70 has a configuration shown in each of the above forms.

In the case of the above embodiment, the detection body 61 of the angle detector 60 is provided at the tip 43 of the boom 31, and the lever 62 is coupled to the mounting member 56 (see FIG. 3) of the arm 32. Although not illustrated, the detection body 61 may alternatively be provided on the arm 32 side, and the lever 62 may be coupled to a member provided on the boom 31. In this case, the arm 32 is the first arm, and the boom 31 is the second arm.

In the present embodiment (for example, FIG. 4 and FIG. 5), the tip 43 of the boom 31 has a bifurcated shape, and the base portion 51 of the arm 32 is positioned between the first frame 431 and the second frame 432. A structure of the coupling portion 37 between the boom 31 and the arm 32 may be other than a form illustrated in the drawings.

The working machine 10 of the present embodiment is the backhoe, but may be another working machine. When the working machine 10 is the backhoe, the backhoe is not limited to the illustrated form, and can be changed within the scope of the present invention.

The embodiments are illustrative in all respects and are not restrictive. The scope of the present invention is defined by the claims rather than the embodiments, and includes all changes within the scope equivalent to configurations described in the claims.

REFERENCE SIGNS LIST

• • 10 working machine
  • 11 machine body
  • 13 arm device
  • 31 boom (first arm)
  • 32 arm (second arm)
  • 37 coupling portion
  • 43 tip
  • 44 end surface (boom end surface)
  • 55 bracket
  • 56 mounting member (member on second arm side)
  • 60 angle detector
  • 61 detection body
  • 62 lever
  • 70 protection portion
  • 71 cover
  • 711 outer peripheral wall
  • 712 outer wall
  • 713 inner wall
  • 714 auxiliary wall
  • 72 guide
  • 72a outer peripheral surface
  • 72b inner peripheral surface
  • 80 hose
  • C1 central axis
  • K1 passing region
  • K2 displacement region