FRONT LOADER AND WORKING VEHICLE

Description

TECHNICAL FIELD

The disclosure relates to a technique of a front loader and a working vehicle.

BACKGROUND ART

Conventionally, techniques of a front loader and a working vehicle are known. For example, JP 2020-169553 A describes such a technique.

JP 2020-169553 A discloses a technique of detecting height information and angle information of a bucket and displaying the information on a front loader screen. This allows an operator to easily check the height and angle of the bucket.

In such a front loader, an angle sensor for detecting a rotation angle of a rotating member (for example, a bucket, a boom, or the like) is provided. The angle sensor includes, for example, a portion to be detected (for example, a magnet) and a detection unit (for example, a sensor body) capable of detecting a rotation angle of the portion to be detected. For example, the detection unit is fixed to a support frame, and the portion to be detected is fixed to the boom and the detection unit detects the rotation angle of the portion to be detected, whereby the rotation angle of the boom can be detected.

In a case where the angle sensor as described above is used, it is necessary to keep a distance between the portion to be detected and the detection unit at an appropriate operation distance. However, in a case where the angle sensor is provided between two relatively rotating members such as a boom, the distance between the portion to be detected and the detection unit may exceed an appropriate operation distance due to the influence of backlash and tolerance. If the distance between the portion to be detected and the detection unit exceeds the appropriate operation distance, there is a case where the rotation angle of the boom or the like cannot be appropriately detected.

SUMMARY OF INVENTION

One aspect of the present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a front loader and a working vehicle capable of appropriately detecting a relative rotation angle between a first member and a second member.

The problem to be solved by one aspect of the present disclosure is as described above, and means for solving the problem will be described below.

A front loader according to one aspect of the present disclosure is a front loader including a first member, and a second member relatively rotatable with respect to the first member about a predetermined rotating shaft, the front loader including: a fixing member fixed to the first member; a rotating member relatively rotatable with respect to the fixing member; a portion to be detected fixed to one of the fixing member and the rotating member; a detection unit fixed to the other of the fixing member and the rotating member and configured to detect a relative rotation angle of the portion to be detected; and an engagement member fixed to the second member and engaged with the rotating member in a state of allowing movement of the rotating member in an axial direction of the rotating shaft.

According to one aspect of the present disclosure, since an interval between the portion to be detected and the detection unit is not affected by the backlash and tolerance (backlash in the axial direction of the rotating shaft or the like) between the first member and the second member, a relative rotation angle between the first member and the second member can be appropriately detected.

Furthermore, in the rotating member according to one aspect of the present disclosure, an engagement groove extending in a radial direction about the rotating shaft is formed, and the engagement member is formed in a longitudinal shape extending in the axial direction and is inserted into the engagement groove.

According to one aspect of the present disclosure, relative movement between the rotating member and the engagement member can be permitted with a simple configuration. Furthermore, since the engagement member can move along the engagement groove, the relative rotation angle of the first member and the second member can be appropriately detected even in a case where the radial backlash or the like occurs between the first member and the second member.

Furthermore, the engagement member according to one aspect of the present disclosure is disposed so as to protrude from the rotating member in the axial direction, and a protruding amount of the engagement member with respect to the rotating member is formed to be larger than a backlash amount between the first member and the second member.

According to one aspect of the present disclosure, it is possible to prevent the engagement between the engagement member and the rotating member from being released due to backlash between the first member and the second member.

Furthermore, the rotating member according to one aspect of the present disclosure includes fitting portion fitted so as to be relatively rotatable with respect to the fixing member, and further includes a restriction portion configured to restrict movement of the fitting portion in the axial direction with respect to the fixing member.

According to one aspect of the present disclosure, by restricting the relative movement between the fixing member and the rotating member in the axial direction of the rotating shaft, an interval between the portion to be detected and the detection unit can be maintained, and the relative rotation angle between the first member and the second member can be appropriately detected.

Furthermore, the rotating member according to one aspect of the present disclosure includes a fitting portion fitted so as to be relatively rotatable with respect to the fixing member, and at least one of the portion to be detected and the detection unit is accommodated inside the fitting portion.

According to one aspect of the present disclosure, the portion to be detected or the like can be protected by accommodating at least one of the portion to be detected and the detection unit inside the fitting portion.

Furthermore, a working vehicle according to one aspect of the present disclosure includes the front loader.

According to one aspect of the present disclosure, since an interval between the portion to be detected and the detection unit is not affected by the backlash and tolerance (backlash in the axial direction of the rotating shaft or the like) between the first member and the second member, a relative rotation angle between the first member and the second member can be appropriately detected.

According to one aspect of the present disclosure, since an interval between the portion to be detected and the detection unit is not affected by the backlash and tolerance (backlash in the axial direction of the rotating shaft or the like) between the first member and the second member, a relative rotation angle between the first member and the second member can be appropriately detected.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a side view illustrating an overall configuration of a tractor according to an embodiment of the present disclosure;

FIG. 2 is a side cross-sectional view illustrating a front loader provided with a rotation angle detection mechanism;

FIG. 3 is a perspective view illustrating the rotation angle detection mechanism;

FIG. 4 is a side view illustrating the rotation angle detection mechanism;

FIG. 5 is a plan view illustrating the rotation angle detection mechanism;

FIG. 6 is a rear view illustrating the rotation angle detection mechanism; and

FIG. 7 is a schematic plan cross-sectional view illustrating the rotation angle detection mechanism.

DESCRIPTION OF EMBODIMENTS

In the following description, directions indicated by arrows U, D, F, B, L, and R in the drawings are defined as an upward direction, a downward direction, a forward direction, a backward direction, a left direction, and a right direction, respectively. Note that the forward direction is a direction in which a tractor 1 moves forward, and the backward direction is a direction in which the tractor 1 moves backward.

First, an overall configuration of a tractor 1 according to an aspect of the present disclosure will be described.

As illustrated in FIG. 1, the tractor 1 mainly includes a machine body frame 2, an engine 3, a transmission case 4, a lifting device 5, front wheels 6, rear wheels 7, a bonnet 9, a cabin 10, a steering wheel 12, and a front loader 20.

The machine body frame 2 is a frame-shaped member formed by appropriately combining a plurality of panel members. The machine body frame 2 is formed in a substantially rectangular shape in plan view. The machine body frame 2 is disposed with its longitudinal direction oriented in a front-back direction. The engine 3 is fixed to a rear portion of the machine body frame 2. The transmission case 4 is fixed to a rear portion of the engine 3.

The lifting device 5 is provided at a rear portion of the transmission case 4. Various working devices (for example, a cultivator or the like) can be mounted on the lifting device 5. The lifting device 5 can lift and lower the mounted working device by an actuator such as a hydraulic cylinder.

A front portion of the machine body frame 2 is supported by a pair of the left and right front wheels 6 through a front axle mechanism (not illustrated). The rear portion of the transmission case 4 is supported by a pair of the left and right rear wheels 7 through a rear axle mechanism (not illustrated). The pair of left and right rear wheels 7 is covered with a fender 8 from substantially above.

The engine 3 is covered with the bonnet 9. Power of the engine 3 can be transmitted to the front wheels 6 through the front axle mechanism and can be transmitted to the rear wheels 7 through the rear axle mechanism after being shifted by a transmission device (not illustrated) accommodated in the transmission case 4. The front wheels 6 and the rear wheels 7 are rotationally driven by the power of the engine 3, and the tractor 1 can travel.

The cabin 10 is provided behind the engine 3. Inside the cabin 10, a living space on which a worker boards is formed. In the living space, the steering wheel 12 for adjusting a turning angle of the front wheels 6, a console (not illustrated) provided with various operation tools, a seat 14 on which the worker sits, and the like are disposed. For example, an operation lever or the like for operating the front loader 20 is disposed on the console.

The front loader 20 is mounted to a front portion of the tractor 1. As illustrated in FIGS. 1 and 2, the front loader 20 includes a side frame 30, a boom 40, and a bucket 50.

The side frame 30 is detachably provided on a vehicle body (the machine body frame 2 and the transmission case 4) of the tractor 1. The side frames 30 are provided on the left and right of the vehicle body, respectively. As illustrated in FIG. 3, the side frame 30 includes a pair of left and right side walls 31, a plurality of coupling portions (for example, a coupling portion 32 illustrated in FIG. 3) that couples the pair of side walls 31, boss portions 33 respectively provided on the pair of side walls 31, and a boom rotating shaft 34 fixed to the boss portions 33. The boom rotating shaft 34 is disposed with its axis oriented to the left and right. An end portion of the boom rotating shaft 34 is disposed so as to protrude from the boss portion 33.

The boom 40 illustrated in FIGS. 1 and 2 is rotatably supported by the left and right side frames 30 through the boom rotating shaft 34. The boom 40 is disposed so as to extend forward and downward from an upper portion of each of the side frames 30. The boom 40 is provided with a boom cylinder 40a. The boom 40 can rotate with respect to the side frame 30 by extension and contraction of the boom cylinder 40a.

The bucket 50 is formed to open forward. The bucket 50 is rotatably coupled to a front end portion of the boom 40. The bucket 50 is provided with a bucket cylinder 50a through a link mechanism 60. The link mechanism 60 includes a first link member 61 coupled to the boom 40 and a second link member 62 coupled to the bucket 50. A link rotating shaft 63 is fixed to the first link member 61, and the first link member 61 is rotatably coupled to the boom 40 through the link rotating shaft 63. The bucket 50 can rotate with respect to the boom 40 by extension and contraction of the bucket cylinder 50a.

The worker can operate the front loader 20 by rocking a loader lever back and forth and right and left to expand and contract the boom cylinder 40a and the bucket cylinder 50a.

As illustrated in FIG. 2, the front loader 20 is provided with a rotation angle detection mechanism 100 capable of detecting the rotation angles of the boom 40 and the bucket 50. Specifically, the rotation angle detection mechanism 100 is provided on an inner side surface of the boom 40 on the right side. The rotation angle detection mechanism 100 (hereinafter, referred to as a “rotation angle detection mechanism 100A”) that detects a rotation angle of the boom 40 with respect to the side frame 30 is provided at a coupling portion between the side frame 30 and the boom 40 (near the boom rotating shaft 34). Furthermore, the rotation angle detection mechanism 100 (hereinafter, referred to as a “rotation angle detection mechanism 100B”) that detects a rotation angle of the bucket 50 with respect to the boom 40 is provided at a coupling portion between the boom 40 and the link mechanism 60 (near the link rotating shaft 63).

Hereinafter, the configuration of the rotation angle detection mechanism 100 will be described. Note that, since the configurations of the rotation angle detection mechanism 100A and the rotation angle detection mechanism 100B are substantially the same, the following description will focus on the rotation angle detection mechanism 100A.

The rotation angle detection mechanism 100A illustrated in FIGS. 3 to 7 detects a rotation angle of the boom 40 with respect to the side frame 30. The rotation angle detection mechanism 100A mainly includes a magnet 110, a sensor stay 120, a restriction pin 130, a sensor body 140, a sensor cover 150, and a detection rod 160.

The magnet 110 illustrated in FIGS. 5 to 7 generates a magnetic field. The magnet 110 is formed in a disk shape. The magnet 110 is fixed to the boom rotating shaft 34 provided so as to protrude leftward from a left side surface of the side frame 30 (boss portion 33). Specifically, the magnet 110 is fixed to a center of a left end surface of the boom rotating shaft 34.

The sensor stay 120 illustrated in FIGS. 3 to 5 supports the sensor body 140 to be described later. The sensor stay 120 mainly includes a stay body 121 and a cylindrical portion 122.

The stay body 121 constitutes a main part of the sensor stay 120. The stay body 121 is formed by bending a longitudinal panel member. The stay body 121 mainly includes a first plate-shaped portion 121a, a second plate-shaped portion 121b, and a third plate-shaped portion 121c.

The first plate-shaped portion 121a illustrated in FIGS. 3 to 5 and FIG. 7 is a portion to which the sensor body 140 described later is attached. The first plate-shaped portion 121a is disposed with the plate surface facing left and right. The first plate-shaped portion 121a is formed in a substantially rectangular shape in side view. As illustrated in FIG. 7, a through hole 121d is formed in a rear portion of the first plate-shaped portion 121a. The through hole 121d is formed in a circular shape having an inner diameter larger than a diameter of the magnet 110.

The second plate-shaped portion 121b illustrated in FIGS. 3 to 5 is a portion formed so as to be continuous with a front end portion of the first plate-shaped portion 121a. The second plate-shaped portion 121b is formed so as to be bent by approximately 90 degrees with respect to the first plate-shaped portion 121a. The second plate-shaped portion 121b is formed to be bent rightward (in a direction approaching the boom 40) from the front end of the first plate-shaped portion 121a.

The third plate-shaped portion 121c is a portion formed so as to be continuous with a right end portion of the second plate-shaped portion 121b. The third plate-shaped portion 121c is formed so as to be bent by approximately 90 degrees with respect to the second plate-shaped portion 121b. The third plate-shaped portion 121c is formed to be bent forward from the right end of the second plate-shaped portion 121b. The third plate-shaped portion 121c is formed so as to be parallel to the first plate-shaped portion 121a. A long groove portion 121e is formed in the third plate-shaped portion 121c.

The long groove portion 121e illustrated in FIGS. 3 and 4 is formed so as to cut out an end portion of the third plate-shaped portion 121c. The long groove portion 121e is formed to extend rearward from a front end portion of the third plate-shaped portion 121c. The long groove portion 121e is formed so as to extend in parallel in the radial direction around the boom rotating shaft 34 in side view. The long groove portion 121e is formed to have a constant width over the entire length.

The cylindrical portion 122 illustrated in FIGS. 3 and 5 to 7 is a portion fitted so as to be rotatable with respect to the boom rotating shaft 34. The cylindrical portion 122 is formed in a cylindrical shape with an axis line facing the left and right. An inner diameter of the cylindrical portion 122 is formed to be slightly larger than an outer diameter of the boom rotating shaft 34. The cylindrical portion 122 is fixed to a right side surface of the first plate-shaped portion 121a of the stay body 121. The cylindrical portion 122 is disposed on the same axis as the through hole 121d formed in the first plate-shaped portion 121a. The cylindrical portion 122 is rotatably fitted to a left end portion of the boom rotating shaft 34. As a result, the magnet 110 fixed to the end portion of the boom rotating shaft 34 is accommodated inside the cylindrical portion 122. A long hole 122a is formed in the cylindrical portion 122.

The long hole 122a is formed so as to penetrate a side surface of the cylindrical portion 122. The long hole 122a is formed to extend by a predetermined length along a circumferential direction of the cylindrical portion 122. The long hole 122a is formed so as to have a constant width over the whole.

The restriction pin 130 illustrated in FIGS. 5 to 7 restricts the movement of the sensor stay 120 attached to the boom rotating shaft 34 to the left and right. The restriction pin 130 is formed in a cylindrical shape. The restriction pin 130 may be configured by a spring pin or the like, for example. An outer diameter of the restriction pin 130 is formed to be slightly smaller than a width of the long hole 122a. The restriction pin 130 is fixed in a state of being inserted into the boom rotating shaft 34. One end portion (rear end portion) of the restriction pin 130 is disposed so as to protrude from boom rotating shaft 34. The one end portion of the restriction pin 130 is inserted into the long hole 122a of the cylindrical portion 122. The restriction pin 130 disposed as described above can restrict the cylindrical portion 122 fitted to the boom rotating shaft 34 from moving in the axial direction of the boom rotating shaft 34 while allowing the cylindrical portion to rotate about the boom rotating shaft 34.

The sensor body 140 illustrated in FIGS. 4 to 7 detects a relative rotation angle of the magnet 110. The sensor body 140 can detect the rotation angle of the magnet 110 by converting a change in the magnetic field of the magnet 110 into electric resistance. The sensor body 140 is fixed to a left side surface of the first plate-shaped portion 121a of the stay body 121. The sensor body 140 is disposed so as to cover the through hole 121d formed in the first plate-shaped portion 121a from the left side. The sensor body 140 and the magnet 110 are disposed so as to face each other in the left-right direction through the through hole 121d.

Here, in order for the sensor body 140 to appropriately detect the rotation angle of the magnet 110, it is necessary to maintain a distance between the sensor body 140 and the magnet 110 at an appropriate operation distance. In the present embodiment, the movement of the sensor stay 120 in the axial direction with respect to the boom rotating shaft 34 is restricted by the restriction pin 130. Therefore, the distance between the sensor body 140 and the magnet 110 can be maintained at a constant distance (appropriate operation distance).

The sensor cover 150 illustrated in FIGS. 3 to 7 is for protecting the sensor body 140. The sensor cover 150 is disposed so as to cover the sensor body 140 from the left. The sensor cover 150 is fixed to the left side surface of the first plate-shaped portion 121a of the stay body 121.

The detection rod 160 illustrated in FIGS. 3 to 5 is fixed to the boom 40 and is engaged with the sensor stay 120. The detection rod 160 is formed in a columnar shape (longitudinal shape) with the longitudinal direction facing left and right. An outer diameter of the detection rod 160 is formed to be slightly smaller than a width of the long groove portion 121e. The detection rod 160 is fixed to a left side surface of the boom 40 through a rod stay 161. The detection rod 160 is inserted into the long groove portion 121e of the sensor stay 120.

The detection rod 160 is disposed so as to protrude leftward from the sensor stay 120 (third plate-shaped portion 121c) through the long groove portion 121e. A protruding amount (a length of a protruding portion) of the detection rod 160 from the sensor stay 120 is formed to be larger than a backlash amount of the boom 40 with respect to the side frame 30 in the axial direction (left-right direction) of the boom rotating shaft 34. Accordingly, the detection rod 160 does not come out of the long groove portion 121e due to the backlash between the side frame 30 and the boom 40.

Since the outer diameter of the detection rod 160 is slightly smaller than the width of the long groove portion 121e, the detection rod 160 is not fixed to the long groove portion 121e (sensor stay 120). That is, the detection rod 160 can move inside the long groove portion 121e along the longitudinal direction of the long groove portion 121e. Furthermore, the detection rod 160 can move left and right with respect to the long groove portion 121e. Furthermore, in a case where the boom 40 rotates with respect to the side frame 30, the detection rod 160 can rotate the sensor stay 120 by pushing the side surface of the long groove portion 121e.

The rotation angle detection mechanism 100A thus configured can detect the rotation angle of the boom 40 with respect to the side frame 30.

Specifically, when the boom 40 illustrated in FIG. 4 rotates about the boom rotating shaft 34, the detection rod 160 also rotates together with the boom 40. Since the detection rod 160 is inserted (engaged) into the long groove portion 121e of the sensor stay 120, when the detection rod 160 rotates, the sensor stay 120 rotates about the boom rotating shaft 34.

When the sensor stay 120 rotates, the sensor body 140 fixed to the sensor stay 120 illustrated in FIG. 7 also rotates. As a result, the sensor body 140 and the magnet 110 relatively rotate. At this time, the sensor body 140 detects a relative rotation angle of the magnet 110 by converting a change in the magnetic field of the magnet 110 into electric resistance. That is, the sensor body 140 can detect the rotation angle of the boom 40.

Note that, due to backlash or tolerance between the boom 40 and the side frame 30 illustrated in FIG. 5, there is a possibility that the boom 40 moves left and right (in the axial direction of the boom rotating shaft 34) with respect to the side frame 30. However, in the present embodiment, since the detection rod 160 and the sensor stay 120 are not fixed, the relative movement of the boom 40 with respect to the side frame 30 is allowed. That is, even if the boom 40 moves to the left and right with respect to the side frame 30, an interval in the left and right direction between the sensor body 140 and the magnet 110 as illustrated in FIG. 7 is kept constant, so that the rotation angle of the boom 40 can be appropriately detected at all times.

Furthermore, in the present embodiment, as illustrated in FIG. 4, the long groove portion 121e is formed to extend in the radial direction of the boom rotating shaft 34. Therefore, even if the boom 40 moves relative to the side frame 30 due to a radial backlash of the boom rotating shaft 34 or the like, the detection rod 160 can move along the longitudinal direction of the long groove portion 121e. Therefore, even when the boom 40 moves in the radial direction of the boom rotating shaft 34 with respect to the side frame 30, the rotation angle of the boom 40 can be appropriately detected at all times.

Note that, in the above embodiment, the rotation angle detection mechanism 100A that detects the rotation angle of the boom 40 has been described. However, the rotation angle detection mechanism 100B that detects the rotation angle of the bucket 50 can be similarly configured. That is, the magnet 110 is fixed to an end portion of the link rotating shaft 63 illustrated in FIG. 2, and a rotation angle of the link rotating shaft 63 with respect to the boom 40 can be detected using the sensor body 140. Since there is a certain relationship between the rotation angle of the link rotating shaft 63 and the rotation angle of the bucket 50 with respect to the boom 40, the rotation angle of the bucket 50 can be grasped on the basis of the rotation angle of the link rotating shaft 63.

The information (the rotation angles of the boom 40 and the bucket 50) detected by the rotation angle detection mechanism 100 can be used for various purposes. For example, the worker driving the tractor 1 can be notified of the rotation angles of the boom 40 and the bucket 50 by using an appropriate display device (such as a monitor). Furthermore, it is also possible to adjust (control) the attitude of the front loader 20 on the basis of the detected rotation angles of the boom 40 and the bucket 50.

As described above, the front loader 20 according to the present embodiment is a front loader 20 including:

• • a first member (side frame 30); and a second member (boom 40) relatively rotatable with respect to the first member about a predetermined rotating shaft (boom rotating shaft 34), the front loader including:
  • a fixing member (boom rotating shaft 34) fixed to the first member;
  • a rotating member (sensor stay 120) relatively rotatable with respect to the fixing member;
  • a portion to be detected (magnet 110) fixed to one (boom rotating shaft 34) of the fixing member and the rotating member;
  • a detection unit (sensor body 140) fixed to the other (sensor stay 120) of the fixing member and the rotating member and configured to detect a relative rotation angle of the portion to be detected; and
  • an engagement member (detection rod 160) fixed to the second member and engaged with the rotating member in a state of allowing movement of the rotating member in an axial direction of the rotating shaft.

With such a configuration, an interval between the portion to be detected and the detection unit is not affected by the backlash and tolerance (backlash in the axial direction of the rotating shaft or the like) between the first member and the second member, so that the relative rotation angle between the first member and the second member can be appropriately detected.

Furthermore, since the degree of freedom of the installation location of the portion to be detected and the detection unit increases, the detection unit or the like can be installed in a location where the detection unit or the like cannot be installed due to the influence of backlash or the like in the related art.

Furthermore, since a countermeasure for reducing backlash or the like (addition of components or the like) becomes unnecessary, an increase in cost can be prevented.

Furthermore, an engagement groove (long groove portion 121e) extending in the radial direction about the rotating shaft is formed in the rotating member, and

• • the engagement member (detection rod 160) is formed in a longitudinal shape extending in the axial direction and is inserted into the engagement groove.

With such a configuration, relative movement between the rotating member and the engagement member can be permitted with a simple configuration. Furthermore, since the engagement member can move along the engagement groove, the relative rotation angle of the first member and the second member can be appropriately detected even in a case where the radial backlash or the like occurs between the first member and the second member.

Furthermore, the engagement member (detection rod 160) is disposed so as to protrude from the rotating member (sensor stay 120) in the axial direction, and

• • a protruding amount of the engagement member with respect to the rotating member is formed to be larger than a backlash amount between the first member (side frame 30) and the second member (boom 40).

With such a configuration, it is possible to prevent the engagement between the engagement member and the rotating member from being released due to backlash between the first member and the second member.

Furthermore, the rotating member (sensor stay 120) includes

• • a fitting portion (cylindrical portion 122) fitted so as to be relatively rotatable with respect to the fixing member (boom rotating shaft 34), and further includes
  • a restriction portion (restriction pin 130) configured to restrict movement of the fitting portion in the axial direction with respect to the fixing member.

With such a configuration, by restricting the relative movement between the fixing member and the rotating member in the axial direction of the rotating shaft, the interval between the portion to be detected and the detection unit can be maintained, and the relative rotation angle between the first member and the second member can be appropriately detected.

Furthermore, the rotating member (sensor stay 120) includes

• • a fitting portion (cylindrical portion 122) fitted so as to be relatively rotatable with respect to the fixing member (boom rotating shaft 34), and
  • at least one (magnet 110) of the portion to be detected and the detection unit is accommodated inside the fitting portion.

With this configuration, at least one of the portion to be detected and the detection unit is accommodated inside the fitting portion, whereby the portion to be detected and the like can be protected.

Furthermore, the working vehicle (tractor 1) according to the present embodiment includes

• • the front loader 20.

With such a configuration, an interval between the portion to be detected and the detection unit is not affected by the backlash and tolerance (backlash in the axial direction of the rotating shaft or the like) between the first member and the second member, so that the relative rotation angle between the first member and the second member can be appropriately detected.

Note that the side frame 30 according to the present embodiment is an embodiment of a first member according to the disclosure.

Furthermore, the boom rotating shaft 34 according to the present embodiment is an embodiment of the rotating shaft and the fixing member according to the disclosure.

Furthermore, the boom 40 according to the present embodiment is an embodiment of a second member according to the disclosure.

Furthermore, the sensor stay 120 according to the present embodiment is an embodiment of a rotating member according to the disclosure.

Furthermore, the magnet 110 according to the present embodiment is an embodiment of a portion to be detected according to the disclosure.

Furthermore, the sensor body 140 according to the present embodiment is an embodiment of a detection unit according to the disclosure.

Furthermore, the detection rod 160 according to the present embodiment is an embodiment of an engagement member according to the disclosure.

Furthermore, the long groove portion 121e according to the present embodiment is an embodiment of an engagement groove according to the disclosure.

Furthermore, the cylindrical portion 122 according to the present embodiment is an embodiment of a fitting portion according to the disclosure.

Furthermore, the restriction pin 130 according to the present embodiment is an embodiment of a restriction portion according to the disclosure.

Furthermore, the tractor 1 according to the present embodiment is an embodiment of a working vehicle according to the disclosure.

Although one embodiment of the disclosure has been described above, the disclosure is not limited to the above configuration, and various modifications can be made within the scope of the invention described in the claims.

For example, in the present embodiment, an example in which the rotation angles of the boom 40 and the bucket 50 are detected using the rotation angle detection mechanism 100 has been described, but the disclosure is not limited thereto, and a rotation angle of an arbitrary member can be detected using the rotation angle detection mechanism 100.

Furthermore, in the present embodiment, as illustrated in FIG. 7, an example in which the magnet 110 is fixed to the boom rotating shaft 34, and the sensor body 140 is fixed to the sensor stay 120 has been described. However, the disclosure is not limited to this. For example, the sensor body 140 can be fixed to the boom rotating shaft 34 and the magnet 110 can be fixed to the sensor stay 120 by switching the arrangement of both.

Furthermore, in the present embodiment, as illustrated in FIG. 7, an example in which the magnet 110 is accommodated inside the cylindrical portion 122 has been described, but the disclosure is not limited to this. For example, instead of the magnet 110 or in addition to the magnet 110, the sensor body 140 can be disposed inside the cylindrical portion 122.

Furthermore, in the present embodiment, an example in which the stay body 121 is bent as illustrated in FIG. 5 has been described, but the disclosure is not limited to this. For example, the stay body 121 can be formed in a flat plate shape depending on the size, positional relationship, and the like (left and right thickness of the boss portion 33, positional relationship between the boom rotating shaft 34 and the detection rod 160, and the like) of each part.

Furthermore, in the present embodiment, as illustrated in FIG. 4, an example in which the detection rod 160 is inserted into the long groove portion 121e formed at the end portion of the stay body 121 has been described, but the disclosure is not limited to this. For example, it is also possible to insert the detection rod 160 into a through hole penetrating the stay body 121. At this time, the through hole may be formed in a long hole shape extending in the radial direction of the boom rotating shaft 34.

In addition, the shape, structure, and the like of each part exemplified in the present embodiment are merely examples, and the configuration of each part can be arbitrarily changed.

Furthermore, in the above embodiment, the tractor 1 has been exemplified as the working vehicle, but the working vehicle is not limited to such an aspect. For example, the working vehicle may be another agricultural vehicle, a construction vehicle, an industrial vehicle, or the like.