Front loaders and work vehicles

Abstract

A front loader capable of appropriately detecting the relative rotation angle between a first member and a second member. [Solution] The device comprises a fixed member (boom rotation shaft 34) fixed to the first member (side frame 30), a rotating member (sensor stay 120) that is rotatable relative to the fixed member, a detectable part (magnet) fixed to either the fixed member or the rotating member (boom rotation shaft 34), a detecting part (sensor main body) fixed to the other of the fixed member and the rotating member (sensor stay 120) and detecting the relative rotation angle of the detectable part, and an engaging member (detection rod 160) fixed to the second member (boom 40) and engaging with the rotating member while allowing movement of the rotating member in the axial direction of the rotation shaft.

Description

[Technical Field]

[0001] The present invention relates to the technology of front loaders and work vehicles. [Background technology]

[0002] Conventionally, the technology for front loaders and work vehicles has been publicly known, as described in Patent Document 1, for example.

[0003] Patent Document 1 discloses a technology that detects bucket height and angle information and displays it on a front loader screen, allowing the operator to easily check the bucket height and angle.

[0004] Such front loaders are provided with an angle sensor for detecting the rotation angle of a rotating member (e.g., a bucket, a boom, etc.). Some angle sensors include, for example, a detected part (e.g., a magnet) and a detecting part (e.g., a sensor body) that can detect the rotation angle of the detected part. For example, the detecting part is fixed to a support frame, and the detected part is fixed to the boom, and the detecting part detects the rotation angle of the detected part, thereby making it possible to detect the rotation angle of the boom.

[0005] When using the angle sensor described above, it is necessary to maintain an appropriate operating distance between the detected part and the detecting part. However, when the angle sensor is installed between two components that rotate relatively, such as a boom, the distance between the detected part and the detecting part may exceed the appropriate operating distance due to the influence of backlash and tolerance. If the distance between the detected part and the detecting part exceeds the appropriate operating distance, it may not be possible to properly detect the rotation angle of the boom, etc. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2020-169553 Summary of the Invention [Problem to be solved by the invention]

[0007] One aspect of the present disclosure has been made in consideration of the above-described circumstances, and the problem it aims to solve is to provide a front loader and a work vehicle that are capable of appropriately detecting the relative rotation angle between a first member and a second member. [Means for solving the problem]

[0008] The problem to be solved by one embodiment of the present disclosure has been described above, and next, the means for solving this problem will be described.

[0009] A front loader according to one aspect of the present disclosure is a front loader comprising a first member and a second member rotatable relative to the first member around a predetermined rotation axis, and further comprising: a fixed member fixed to the first member; a rotating member rotatable relative to the fixed member; a detectable part fixed to either the fixed member or the rotating member; a detecting part fixed to the other of the fixed member or the rotating member and detecting the relative rotation angle of the detectable part; and an engaging member fixed to the second member and engaging with the rotating member while allowing movement of the rotating member in the axial direction of the rotation axis. According to one aspect of the present disclosure, the distance between the detected part and the detecting part is not affected by the play and tolerance (such as play in the axial direction of the rotation axis) between the first member and the second member, and therefore the relative rotation angle between the first member and the second member can be properly detected.

[0010] In addition, in one aspect of the present disclosure, the rotating member has an engagement groove formed therein extending radially around the rotating axis, and the engaging member is formed elongated and extends in the axial direction and is inserted into the engagement groove. According to one aspect of the present disclosure, it is possible to allow relative movement between the rotating member and the engaging member with a simple configuration. Furthermore, because the engaging member can move along the engaging groove, it is possible to appropriately detect the relative rotation angle between the first member and the second member even when there is a play in the radial direction between the first member and the second member.

[0011] Furthermore, in one aspect of the present disclosure, the engaging member is arranged so as to protrude from the rotating member in the axial direction, and the amount of protrusion of the engaging member relative to the rotating member is formed so as to be greater than the amount of play 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 engaging member and the rotating member from being released due to backlash between the first member and the second member.

[0012] Furthermore, the rotating member according to one aspect of the present disclosure includes an engaging portion that is fitted to the fixed member so as to be rotatable relative to the fixed member, and further includes a regulating portion that regulates movement of the engaging portion in the axial direction relative to the fixed member. According to one aspect of the present disclosure, by restricting the relative movement between the fixed member and the rotating member in the axial direction of the rotating shaft, the distance between the detected part and the detecting part can be maintained, and the relative rotation angle between the first member and the second member can be properly detected.

[0013] Furthermore, the rotating member according to one aspect of the present disclosure has an engaging portion that is fitted to the fixed member so as to be rotatable relative to the fixed member, and at least one of the detectable portion and the detecting portion is housed inside the engaging portion. According to one aspect of the present disclosure, at least one of the detected portion and the detecting portion is housed inside the fitting portion, thereby making it possible to protect the detected portion and the like.

[0014] A work vehicle according to one aspect of the present disclosure includes the front loader. According to one aspect of the present disclosure, the distance between the detected part and the detecting part is not affected by the play and tolerance (such as play in the axial direction of the rotation axis) between the first member and the second member, and therefore the relative rotation angle between the first member and the second member can be properly detected. [Effects of the Invention]

[0015] According to one aspect of the present disclosure, the distance between the detected part and the detecting part is not affected by the play and tolerance (such as play in the axial direction of the rotation axis) between the first member and the second member, and therefore the relative rotation angle between the first member and the second member can be properly detected. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a side view showing the overall configuration of a tractor according to an embodiment of the present disclosure; [Figure 2] FIG. 2 is a side cross-sectional view showing a front loader provided with a rotation angle detection mechanism. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 4 is a schematic plan sectional view showing a rotation angle detection mechanism. DETAILED DESCRIPTION OF THE INVENTION

[0017] In the following description, the directions indicated by arrows U, D, F, B, L, and R in the drawings are defined as the upward direction, downward direction, forward direction, backward direction, leftward direction, and rightward direction, respectively. Note that the forward direction is the direction in which the tractor 1 moves forward, and the backward direction is the direction in which the tractor 1 moves backward.

[0018] First, the overall configuration of a tractor 1 according to one embodiment of the present disclosure will be described.

[0019] As shown in FIG. 1, the tractor 1 mainly comprises a machine 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.

[0020] The vehicle frame 2 is a frame-like member formed by appropriately combining a plurality of plate materials. The vehicle frame 2 is formed in a generally rectangular shape when viewed from above. The vehicle frame 2 is disposed with its longitudinal direction oriented in the front-to-rear direction. An engine 3 is fixed to the rear of the vehicle frame 2. A transmission case 4 is fixed to the rear of the engine 3.

[0021] A lifting device 5 is provided at the rear of the transmission case 4. Various types of working equipment (for example, a tiller) can be attached to the lifting device 5. The lifting device 5 can raise and lower the attached working equipment by using an actuator such as a hydraulic cylinder.

[0022] The front of the vehicle frame 2 is supported by a pair of left and right front wheels 6 via a front axle mechanism (not shown). The rear of the transmission case 4 is supported by a pair of left and right rear wheels 7 via a rear axle mechanism (not shown). The pair of left and right rear wheels 7 are generally covered from above by fenders 8.

[0023] The engine 3 is covered by a hood 9. The power of the engine 3 is changed in speed by a transmission (not shown) housed in a transmission case 4, and then can be transmitted to the front wheels 6 via the front axle mechanism, and can be transmitted to the rear wheels 7 via the rear axle mechanism. The front wheels 6 and rear wheels 7 are driven to rotate by the power of the engine 3, allowing the tractor 1 to travel.

[0024] A cabin 10 is provided behind the engine 3. A living space for an operator is formed inside the cabin 10. In the living space, a steering wheel 12 for adjusting the turning angle of the front wheels 6, a console (not shown) on which various operating tools are provided, and a seat 14 for the operator to sit in are arranged. On the console, for example, operating levers for operating the front loader 20 are arranged.

[0025] A front loader 20 is attached to the front of the tractor 1. As shown in FIGS. 1 and 2, the front loader 20 includes side frames 30, a boom 40, and a bucket 50.

[0026] The side frames 30 are detachably mounted on the body (machine frame 2 and transmission case 4) of the tractor 1. The side frames 30 are mounted on the left and right sides of the body. As shown in FIG. 3, the side frames 30 include a pair of left and right side walls 31, a plurality of connecting portions (for example, connecting portion 32 shown in FIG. 3) connecting the pair of side walls 31, boss portions 33 provided on each of the pair of side walls 31, and a boom rotation shaft 34 fixed to the boss portions 33. The boom rotation shaft 34 is disposed with its axis facing left and right. The end of the boom rotation shaft 34 is disposed so as to protrude from the boss portions 33.

[0027] 1 and 2 is rotatably supported on the left and right side frames 30 via boom rotation shafts 34. The boom 40 is disposed so as to extend downward and forward from the top of the side frames 30. A boom cylinder 40a is provided on the boom 40. The boom 40 can rotate relative to the side frames 30 by extension and contraction of the boom cylinder 40a.

[0028] The bucket 50 is formed so as to open forward. The bucket 50 is rotatably connected to the front end of the boom 40. A bucket cylinder 50a is provided to the bucket 50 via a link mechanism 60. The link mechanism 60 includes a first link member 61 connected to the boom 40 and a second link member 62 connected to the bucket 50. A link pivot shaft 63 is fixed to the first link member 61, and the first link member 61 is rotatably connected to the boom 40 via the link pivot shaft 63. The bucket 50 can rotate relative to the boom 40 by extension and contraction of the bucket cylinder 50a.

[0029] The operator can operate the front loader 20 by swinging the loader lever back and forth and left and right to extend and retract the boom cylinder 40a and bucket cylinder 50a.

[0030] As shown in FIG. 2, the front loader 20 is provided with a rotation angle detection mechanism 100 capable of detecting the rotation angle of the boom 40 and the bucket 50. Specifically, the rotation angle detection mechanism 100 is provided on the inner side surface of the right boom 40. The rotation angle detection mechanism 100 (hereinafter referred to as the "rotation angle detection mechanism 100A") that detects the rotation angle of the boom 40 relative to the side frame 30 is provided at the connection portion between the side frame 30 and the boom 40 (near the boom rotation shaft 34). In addition, the rotation angle detection mechanism 100 (hereinafter referred to as the "rotation angle detection mechanism 100B") that detects the rotation angle of the bucket 50 relative to the boom 40 is provided at the connection portion between the boom 40 and the link mechanism 60 (near the link rotation shaft 63).

[0031] The following describes the configuration of the rotation angle detection mechanism 100. Note that since the rotation angle detection mechanisms 100A and 100B have roughly the same configuration, the following description focuses on the rotation angle detection mechanism 100A.

[0032] 3 to 7 detects the rotation angle of the boom 40 relative 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 main body 140, a sensor cover 150, and a detection rod 160.

[0033] The magnet 110 shown in Figures 5 to 7 generates a magnetic field. The magnet 110 is formed in a disk shape. The magnet 110 is fixed to the boom rotation shaft 34 that protrudes leftward from the left side surface of the side frame 30 (boss portion 33). Specifically, the magnet 110 is fixed to the center of the left end surface of the boom rotation shaft 34.

[0034] 3 to 5 supports a sensor main body 140 (described later). The sensor stay 120 mainly includes a stay main body 121 and a cylindrical portion 122.

[0035] The stay body 121 constitutes the main part of the sensor stay 120. The stay body 121 is formed by bending a longitudinal plate material. 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.

[0036] The first plate-shaped portion 121a shown in FIGS. 3 to 5 and 7 is a portion to which the sensor main body 140, which will be described later, is attached. The first plate-shaped portion 121a is disposed with its plate surface facing left and right. The first plate-shaped portion 121a is formed in a generally rectangular shape when viewed from the side. As shown in FIG. 7, a through-hole 121d is formed in the rear portion of the first plate-shaped portion 121a. The through-hole 121d is formed in a circular shape with an inner diameter larger than the diameter of the magnet 110.

[0037] 3 to 5 is a portion formed so as to be continuous with the front end portion of the first plate-shaped portion 121a. The second plate-shaped portion 121b is formed so as to bend at approximately 90 degrees relative to the first plate-shaped portion 121a. The second plate-shaped portion 121b is formed so as to bend rightward (toward the boom 40) from the front end of the first plate-shaped portion 121a.

[0038] The third plate-shaped portion 121c is a portion formed so as to be continuous with the right end portion of the second plate-shaped portion 121b. The third plate-shaped portion 121c is formed so as to bend at approximately 90 degrees relative to the second plate-shaped portion 121b. The third plate-shaped portion 121c is formed so as to bend 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.

[0039] 3 and 4 is formed by cutting out an end portion of the third plate-shaped portion 121c. The long groove portion 121e is formed to extend rearward from the front end portion of the third plate-shaped portion 121c. The long groove portion 121e is formed to extend parallel to the radial direction centered on the boom pivot shaft 34 in a side view. The long groove portion 121e is formed to have a constant width throughout.

[0040] The cylindrical portion 122 shown in Figures 3 and 5 to 7 is a portion that is rotatably fitted to the boom rotation shaft 34. The cylindrical portion 122 is formed in a cylindrical shape with its axis facing left and right. The inner diameter of the cylindrical portion 122 is formed to be slightly larger than the outer diameter of the boom rotation shaft 34. The cylindrical portion 122 is fixed to the right side surface of the first plate-shaped portion 121a of the stay main body 121. The cylindrical portion 122 is arranged 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 the left end of the boom rotation shaft 34. As a result, the magnet 110 fixed to the end of the boom rotation shaft 34 is housed inside the cylindrical portion 122. An elongated hole 122a is formed in the cylindrical portion 122.

[0041] The elongated hole 122a is formed to penetrate the side surface of the cylindrical portion 122. The elongated hole 122a is formed to extend a predetermined length along the circumferential direction of the cylindrical portion 122. The elongated hole 122a is formed to have a constant width over its entire length.

[0042] The restricting pin 130 shown in FIGS. 5 to 7 restricts left and right movement of the sensor stay 120 attached to the boom rotating shaft 34. The restricting pin 130 is formed in a cylindrical shape. The restricting pin 130 can be formed, for example, by a spring pin or the like. The outer diameter of the restricting pin 130 is formed slightly smaller than the width of the elongated hole 122a. The restricting pin 130 is fixed in a state where it is inserted into the boom rotating shaft 34. One end (rear end) of the restricting pin 130 is positioned so as to protrude from the boom rotating shaft 34. One end of the restricting pin 130 is inserted into the elongated hole 122a of the cylindrical portion 122. The restricting pin 130 positioned in this manner can restrict movement of the cylindrical portion 122 fitted to the boom rotating shaft 34 in the axial direction of the boom rotating shaft 34 while allowing it to rotate about the boom rotating shaft 34.

[0043] The sensor main body 140 shown in Figs. 4 to 7 detects the relative rotation angle of the magnet 110. The sensor main body 140 can detect the rotation angle of the magnet 110 by converting changes in the magnetic field of the magnet 110 into electrical resistance. The sensor main body 140 is fixed to the left side surface of the first plate-shaped portion 121a of the stay main body 121. The sensor main body 140 is arranged so as to cover the through-hole 121d formed in the first plate-shaped portion 121a from the left side. The sensor main body 140 and the magnet 110 are arranged so as to face each other on the left and right with the through-hole 121d interposed therebetween.

[0044] Here, in order for the sensor main body 140 to properly detect the rotation angle of the magnet 110, it is necessary to maintain an appropriate operating distance between the sensor main body 140 and the magnet 110. In this embodiment, the axial movement of the sensor stay 120 relative to the boom rotation shaft 34 is restricted by the restricting pin 130. Therefore, it is possible to maintain a constant distance (appropriate operating distance) between the sensor main body 140 and the magnet 110.

[0045] 3 to 7 is for protecting the sensor main body 140. The sensor cover 150 is arranged so as to cover the sensor main 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 main body 121.

[0046] The detection rod 160 shown in Figures 3 to 5 is fixed to the boom 40 and engaged with the sensor stay 120. The detection rod 160 is formed in a cylindrical (longitudinal) shape with its longitudinal direction facing left and right. The outer diameter of the detection rod 160 is formed to be slightly smaller than the width of the long groove portion 121e. The detection rod 160 is fixed to the left side surface of the boom 40 via the rod stay 161. The detection rod 160 is inserted into the long groove portion 121e of the sensor stay 120.

[0047] The detection rod 160 is disposed so as to protrude leftward from the sensor stay 120 (third plate-shaped portion 121c) via the long groove portion 121e. The amount of protrusion (the length of the protruding portion) of the detection rod 160 from the sensor stay 120 is formed to be greater than the amount of backlash of the boom 40 relative to the side frame 30 in the axial direction (left-right direction) of the boom rotating shaft 34. This prevents the detection rod 160 from coming out of the long groove portion 121e due to backlash between the side frame 30 and the boom 40.

[0048] Because 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. The detection rod 160 can also move left and right relative to the long groove portion 121e. When the boom 40 rotates relative to the side frame 30, the detection rod 160 can press against the side surface of the long groove portion 121e to rotate the sensor stay 120.

[0049] The rotation angle of the boom 40 relative to the side frame 30 can be detected using the rotation angle detection mechanism 100A configured in this manner.

[0050] 4 rotates around the boom rotation shaft 34, the detection rod 160 also rotates together with the boom 40. Since the detection rod 160 is inserted into (engaged with) the long groove portion 121e of the sensor stay 120, when the detection rod 160 rotates, the sensor stay 120 rotates around the boom rotation shaft 34.

[0051] When the sensor stay 120 rotates, the sensor main body 140 fixed to the sensor stay 120 shown in FIG. 7 also rotates. This causes the sensor main body 140 and the magnet 110 to rotate relative to each other. At this time, the sensor main body 140 converts the change in the magnetic field of the magnet 110 into electrical resistance, thereby detecting the relative rotation angle of the magnet 110. In other words, the sensor main body 140 can detect the rotation angle of the boom 40.

[0052] 5, there is a possibility that the boom 40 may move left and right (in the axial direction of the boom rotation shaft 34) relative to the side frame 30. However, in this embodiment, the detection rod 160 and the sensor stay 120 are not fixed, and therefore the boom 40 is allowed to move relative to the side frame 30. In other words, even if the boom 40 moves left and right relative to the side frame 30, the distance between the sensor main body 140 and the magnet 110 in the left and right direction as shown in FIG. 7 is kept constant, and therefore the rotation angle of the boom 40 can always be detected appropriately.

[0053] 4, the long groove 121e is formed to extend in the radial direction of the boom rotation shaft 34. Therefore, even if the boom 40 moves relative to the side frame 30 due to play in the radial direction of the boom rotation shaft 34, the detection rod 160 can move along the longitudinal direction of the long groove 121e. Therefore, even if the boom 40 moves in the radial direction of the boom rotation shaft 34 relative to the side frame 30, the rotation angle of the boom 40 can always be detected appropriately.

[0054] While the above embodiment has described rotation angle detection mechanism 100A that detects the rotation angle of boom 40, rotation angle detection mechanism 100B that detects the rotation angle of bucket 50 can also be configured in a similar manner. That is, magnet 110 is fixed to the end of link rotation shaft 63 shown in FIG. 2 , and sensor main body 140 can be used to detect the rotation angle of link rotation shaft 63 relative to boom 40. Because there is a certain relationship between the rotation angle of link rotation shaft 63 and the rotation angle of bucket 50 relative to boom 40, the rotation angle of bucket 50 can be determined based on the rotation angle of link rotation shaft 63.

[0055] The information detected by the rotation angle detection mechanism 100 (the rotation angles of the boom 40 and the bucket 50) can be used for various purposes. For example, an appropriate display device (monitor, etc.) can be used to notify the operator operating the tractor 1 of the rotation angles of the boom 40 and the bucket 50. It is also possible to adjust (control) the posture of the front loader 20 based on the detected rotation angles of the boom 40 and the bucket 50.

[0056] As described above, the front loader 20 according to this embodiment has the following features: A front loader (20) comprising a first member (side frame (30)) and a second member (boom (40)) that is rotatable relative to the first member about a predetermined rotation axis (boom rotation axis (34)), a fixed member (boom rotation shaft 34) fixed to the first member; a rotating member (sensor stay 120) that is rotatable relative to the fixed member; a detection target (magnet 110) fixed to either the fixed member or the rotating member (boom rotating shaft 34); a detection unit (sensor body 140) fixed to the other of the fixed member and the rotating member (sensor stay 120) and detecting a relative rotation angle of the detection target unit; an engaging member (detection rod 160) fixed to the second member and engaged with the rotating member in a state in which movement of the rotating member in the axial direction of the rotating shaft is permitted; It is equipped with the following. By configuring it in this manner, the distance between the detected part and the detecting part is not affected by the play and tolerances (such as play in the axial direction of the rotation axis) between the first member and the second member, so the relative rotation angle between the first member and the second member can be properly detected. Furthermore, since the degree of freedom in the installation locations of the detected part and the detecting part is increased, they can be installed in locations where it was previously impossible to install the detecting part etc. due to the influence of play or the like. Furthermore, since measures to reduce backlash and the like (such as adding parts) are not required, an increase in costs can be prevented.

[0057] The rotating member also has An engagement groove (long groove portion 121e) is formed extending in the radial direction around the rotation axis, The engagement member (detection rod 160) is The engaging member is formed in a longitudinal shape extending in the axial direction and is inserted into the engaging groove. This configuration allows relative movement between the rotating member and the engaging member with a simple configuration. In addition, because the engaging member can move along the engaging groove, the relative rotation angle between the first member and the second member can be properly detected even when there is radial play between the first member and the second member.

[0058] In addition, the engaging member (detection rod 160) is The sensor stay 120 is disposed so as to protrude from the rotating member in the axial direction. The amount of protrusion of the engaging member relative to the rotating member is formed to be larger than the amount of backlash between the first member (side frame 30) and the second member (boom 40). With this configuration, it is possible to prevent the engagement between the engaging member and the rotating member from being released due to backlash between the first member and the second member.

[0059] In addition, the rotating member (sensor stay 120) is a fitting portion (cylindrical portion 122) fitted to the fixed member (boom rotating shaft 34) so ​​as to be rotatable relative to the fixed member; The fixing member further includes a restricting portion (restricting pin 130) that restricts movement of the fitting portion relative to the fixing member in the axial direction. By configuring it in this manner, the relative movement between the fixed member and the rotating member in the axial direction of the rotating shaft is restricted, thereby maintaining the distance between the detected part and the detecting part, and the relative rotation angle between the first member and the second member can be properly detected.

[0060] In addition, the rotating member (sensor stay 120) is a fitting portion (cylindrical portion 122) fitted to the fixed member (boom rotating shaft 34) so ​​as to be rotatable relative to the fixed member; At least one of the detected part and the detecting part (magnet 110) It is housed inside the fitting portion. With this configuration, at least one of the detected portion and the detecting portion is housed inside the fitting portion, so that the detected portion and the like can be protected.

[0061] In addition, the work vehicle (tractor 1) according to this embodiment is The front loader 20 is provided. By configuring it in this manner, the distance between the detected part and the detecting part is not affected by the play and tolerances (such as play in the axial direction of the rotation axis) between the first member and the second member, so the relative rotation angle between the first member and the second member can be properly detected.

[0062] The side frame 30 according to this embodiment is one embodiment of the first member according to the present invention. The boom rotating shaft 34 according to this embodiment is one embodiment of the rotating shaft and fixing member according to the present invention. The boom 40 according to this embodiment is an embodiment of the second member according to the present invention. The sensor stay 120 according to this embodiment is one embodiment of a rotating member according to the present invention. Moreover, the magnet 110 according to this embodiment is one embodiment of the detection target part according to the present invention. The sensor body 140 according to this embodiment is one embodiment of the detection section according to the present invention. The detection rod 160 according to this embodiment is one embodiment of an engagement member according to the present invention. The long groove portion 121e according to this embodiment is one embodiment of an engagement groove according to the present invention. Moreover, the cylindrical portion 122 according to this embodiment is one embodiment of the fitting portion according to the present invention. The restriction pin 130 according to this embodiment is one embodiment of a restriction portion according to the present invention. The tractor 1 according to this embodiment is one embodiment of the work vehicle according to the present invention.

[0063] Although one embodiment of the present invention has been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention described in the claims.

[0064] For example, in this embodiment, an example has been shown in which the rotation angle of the boom 40 and the bucket 50 is detected using the rotation angle detection mechanism 100, but the present invention is not limited to this, and the rotation angle of any member can be detected using the rotation angle detection mechanism 100.

[0065] 7, the present embodiment has shown an example in which the magnet 110 is fixed to the boom rotating shaft 34 and the sensor main body 140 is fixed to the sensor stay 120, but the present invention is not limited to this. For example, it is also possible to reverse the positions of the two and fix the sensor main body 140 to the boom rotating shaft 34 and the magnet 110 to the sensor stay 120.

[0066] 7, the present embodiment has been described with reference to an example in which the magnet 110 is housed inside the cylindrical portion 122, but the present invention is not limited to this. For example, instead of the magnet 110, or in addition to the magnet 110, the sensor main body 140 may be disposed inside the cylindrical portion 122.

[0067] In addition, in this embodiment, an example is shown in which the stay body 121 is bent as shown in Fig. 5, but the present invention is not limited to this. For example, depending on the dimensions and positional relationship of each part (the left and right thickness of the boss part 33, the positional relationship between the boom rotation shaft 34 and the detection rod 160, etc.), the stay body 121 can also be formed into a flat plate shape.

[0068] In addition, in this embodiment, as shown in Fig. 4, an example has been shown in which the detection rod 160 is inserted into the long groove portion 121e formed at the end portion of the stay main body 121, but the present invention is not limited to this. For example, it is also possible to insert the detection rod 160 into a through hole that penetrates the stay main body 121. In this case, it is also possible to form the through hole in the shape of an elongated hole that extends in the radial direction of the boom rotating shaft 34.

[0069] Furthermore, the shapes, structures, etc. of the various parts exemplified in the above embodiment are merely examples, and the configuration of each part can be changed as desired.

[0070] In addition, in each of the above embodiments, the tractor 1 is used as an example of a work vehicle, but the work vehicle is not limited to this. For example, the work vehicle may be other agricultural vehicles, construction vehicles, industrial vehicles, etc. [Explanation of symbols]

[0071] 1 Tractor 20 Front Loader 30 Side frame 34 Boom rotation shaft 40 Boom 100 Rotation angle detection mechanism 110 Magnet 120 Sensor stay 121 Stay body 121e Long groove 122 Cylindrical part 140 Sensor body 160 Detection rod

Claims

1. A front loader comprising a first member and a second member that is rotatable relative to the first member about a predetermined rotation axis, a fixing member fixed to the first member; a rotating member that is rotatable relative to the fixed member; a detection target portion fixed to either the fixed member or the rotating member; a detection unit fixed to the other of the fixed member and the rotating member, for detecting a relative rotation angle of the detection target unit; an engaging member fixed to the second member and engaging with the rotating member in a state in which movement of the rotating member in the axial direction of the rotating shaft is permitted; A front loader comprising:

2. The rotating member has: An engagement groove is formed extending in a radial direction around the rotation axis, The engaging member is The engagement groove is formed in a longitudinal shape extending in the axial direction, and is inserted into the engagement groove. The front loader according to claim 1 .

3. The engaging member is The rotary member is disposed so as to protrude from the rotary member in the axial direction. a protruding amount of the engaging member relative to the rotating member is formed to be larger than an amount of backlash between the first member and the second member; The front loader according to claim 2.

4. The rotating member is a fitting portion fitted to the fixed member so as to be rotatable relative to the fixed member; a restricting portion that restricts movement of the fitting portion relative to the fixing member in the axial direction, The front loader according to claim 1 .

5. The rotating member is a fitting portion fitted to the fixed member so as to be rotatable relative to the fixed member; At least one of the detected portion and the detecting portion is It is housed inside the fitting portion. The front loader according to claim 1 .

6. A work vehicle comprising the front loader according to any one of claims 1 to 5.

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