Operation mechanism for front loader and work vehicle

Abstract

To provide an operation mechanism for a front loader that is able to reduce the influence of looseness of an operation lever.SOLUTION: An operation mechanism for a front loader includes: an operation lever; a moving pin 50 which is movable in a longitudinal direction and a lateral direction according to an operation of the operation lever and is connected to a control valve; and a regulation mechanism 90 which, in a state where the operation lever is operated to a neutral position, regulates movement of the moving pin 50. The regulation mechanism 90 includes: a ball 92 capable of abutting on a surface of the moving pin 50; and a spring 93 that urges the ball 92 toward the moving pin 50.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a control mechanism for a front loader and a technique for a work vehicle. [Background technology]

[0002] Conventionally, technology regarding an operating mechanism for operating a front loader has been publicly known, as described in Patent Document 1, for example.

[0003] The operation mechanism described in Patent Document 1 includes a loader lever and two push-pull wires. The loader lever is configured to be swingable in the left-right and front-rear directions. The two push-pull wires connect the loader lever and the loader valve. One of the two push-pull wires moves up and down when the loader lever is swung left-right. The other of the two push-pull wires moves up and down when the loader lever is swung front-rear. The up and down movement of the push-pull wire displaces a spool of the loader valve, and the arm and working tool (bucket) of the front loader can be operated.

[0004] However, due to factors such as a gap between the inner and outer wires of the push-pull wire, the spool may not be displaced (only the push-pull wire may operate) until the loader lever is operated by more than a certain amount from the neutral position. If there is an operating range (backlash) within which the spool does not displace, the loader lever may move (wobble) unintentionally near the neutral position due to vibrations while the tractor is traveling. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2017-91061 A Summary of the Invention [Problem to be solved by the invention]

[0006] One aspect of the present disclosure has been made in consideration of the above-described situation, and the problem it aims to solve is to provide an operating mechanism for a front loader and a work vehicle that are capable of reducing the effects of play in the operating lever. [Means for solving the problem]

[0007] The problem to be solved by one embodiment of the present disclosure has been described above. Next, the means for solving this problem will be described.

[0008] In one aspect of the present disclosure, the valve comprises an operating lever, a movable member that is movable in a predetermined direction in response to operation of the operating lever and is connected to a control valve, and a regulating mechanism that regulates the movement of the movable member when the operating lever is operated to a neutral position. According to one aspect of the present disclosure, the influence of rattle of the operating lever can be reduced by restricting the movement of the moving member.

[0009] In one aspect of the present disclosure, the regulating mechanism includes an abutting member capable of abutting against a surface of the moving member, and a biasing member that biases the abutting member toward the moving member. According to one aspect of the present disclosure, the influence of backlash of the operating lever can be reduced with a simple configuration.

[0010] In one aspect of the present disclosure, the movable member includes a first recess that is engageable with the abutment member when the operating lever is operated to a neutral position. According to one aspect of the present disclosure, the influence of backlash of the operating lever can be effectively reduced.

[0011] In one aspect of the present disclosure, the moving member includes a second recess formed to extend along the moving direction of the moving member and to guide the contact member. According to one aspect of the present disclosure, it is possible to suppress an increase in the operating load of the operating lever that is caused by providing a restriction mechanism.

[0012] In one aspect of the present disclosure, the device further includes a support member having a storage portion formed to accommodate the movable member, and the regulating mechanism is provided in a communication hole connecting an outer surface of the support member and the storage portion. According to one aspect of the present disclosure, the restriction mechanism can be easily provided from the outside of the support member.

[0013] In one aspect of the present disclosure, the moving member includes a rotation restricting portion that restricts rotation of the moving member about an axis parallel to a moving direction of the moving member. According to one aspect of the present disclosure, the positioning of the moving member relative to the supporting member can be easily performed.

[0014] In one aspect of the present disclosure, the moving members include a boom moving member for controlling operation of a boom of the front loader, and a bucket moving member for controlling operation of a bucket of the front loader. According to one aspect of the present disclosure, it is possible to reduce the effect of backlash of the operating lever in two operating directions.

[0015] One aspect of the present disclosure includes the operation mechanism for a front loader according to any one of claims 1 to 7. According to one aspect of the present disclosure, the influence of backlash of the operating lever can be reduced. Effect of the Invention

[0016] According to one aspect of the present disclosure, the influence of backlash of the operating lever can be reduced. [Brief description of the drawings]

[0017] [Figure 1] 1 is a side view of a tractor according to an embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] Similarly, an enlarged front view. [Figure 4] (a) is a cross-sectional view taken along line AA, (b) is a diagram in which the connecting member shown in FIG. [Diagram 5] B-B cross section. [Figure 6] (a) is a side view showing the moving pin, (b) is a cross-sectional view taken along line CC. [Figure 7] FIG. 11 is a plan view showing a second through hole and a movable pin according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] In the following description, the directions indicated by arrows U, D, F, B, L and R in the figures are defined as upward, downward, forward, backward, leftward and rightward, respectively.

[0019] Hereinafter, a tractor 1 according to one embodiment of the present invention will be described with reference to FIG.

[0020] The tractor 1 mainly comprises a body frame 2, an engine 3, a transmission case 4, front wheels 5, rear wheels 6, a bonnet 7, a cabin 8, a steering wheel 9, a seat 10, and a front loader 11.

[0021] The vehicle frame 2 is a frame-like member formed by appropriately combining a number of plate materials. The vehicle frame 2 is formed in a generally rectangular shape when viewed from above. The vehicle frame 2 is arranged with its longitudinal direction facing 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. The front of the vehicle frame 2 is supported by a pair of left and right front wheels 5 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 6 via a rear axle mechanism (not shown). The engine 3 is covered by a bonnet 7.

[0022] 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 front wheels 5 via the front axle mechanism, and can be transmitted to rear wheels 6 via the rear axle mechanism. The front wheels 5 and rear wheels 6 are rotated by the power of the engine 3, allowing the tractor 1 to travel.

[0023] A cabin 8 is provided behind the engine 3. A steering wheel 9 for adjusting the turning angle of the front wheels 5 and various operating tools are disposed in front of the cabin 8. A seat 10 for a driver to sit in is disposed approximately in the center of the cabin 8. In addition, an operating mechanism 20 for operating a front loader 11 is provided near the seat 10.

[0024] A front loader 11 is attached to the front of the tractor 1. The front loader 11 includes a boom 12, a bucket 13, a boom cylinder 14, a bucket cylinder 15, a control valve 16, and the like.

[0025] The boom 12 is disposed so as to extend downward and forward. The bucket 13 is detachably connected to the front end of the boom 12. The control valve 16 is configured to be able to supply hydraulic pressure to the boom cylinder 14 and the bucket cylinder 15. The control valve 16 is disposed below the cabin 8. The boom cylinder 14 is extended and retracted by hydraulic pressure from the control valve 16, thereby enabling the boom 12 to rotate relative to the vehicle body. The bucket cylinder 15 is extended and retracted by hydraulic pressure from the control valve 16, thereby enabling the bucket 13 to rotate relative to the boom 12. In this manner, work such as transporting soil and sand can be performed while appropriately rotating the boom 12 and the bucket 13.

[0026] The operation mechanism 20 of the front loader 11 will be described below with reference to FIGS.

[0027] The operation mechanism 20 is for operating the front loader 11 in response to operation by an operator. As shown in Fig. 2, the operation mechanism 20 includes a support member 30, a fixed pin 40, a movable pin 50, a cable 60, a connecting member 70, an operation lever 80, and a restriction mechanism 90. Figs. 2 to 5 show the operation mechanism 20 when the operation lever 80 is in the neutral position.

[0028] The support member 30 shown in Figs. 2, 3 and 4(b) is a member for supporting various members (such as the fixing pin 40) of the operation mechanism 20. The support member 30 is formed in a substantially rectangular parallelepiped shape. The support member 30 is provided inside the cabin 8. As shown in Figs. 3 and 4(b), the support member 30 has a first through hole 31, a second through hole 32 and a communication hole 33.

[0029] The first through hole 31 and the second through hole 32 are holes that vertically penetrate the support member 30. The first through hole 31 and the second through hole 32 are formed in a substantially circular shape in a plan view. The first through hole 31 is formed in the left front part of the support member 30. The second through holes 32 are formed in the left rear part and the right front part of the support member 30, respectively. Hereinafter, the second through hole 32 formed in the left rear part of the support member 30 will be referred to as the "left second through hole 32L". Also, the second through hole 32 formed in the right front part of the support member 30 will be referred to as the "right second through hole 32R".

[0030] The communication holes 33 shown in Figs. 4(b) and 5 are holes that communicate between the second through holes 32 and the outer side surface of the support member 30. One communication hole 33 is formed for each second through hole 32. The communication holes 33 are formed to extend in the left-right direction. The communication holes 33 are formed to be substantially circular in side view. The communication holes 33 are formed to communicate between the second through hole 32L on the left side and the left side surface of the support member 30. The communication holes 33 are also formed to communicate between the second through hole 32R on the right side and the right side surface of the support member 30. A female screw portion (not shown) is formed on the inner peripheral surface of each communication hole 33.

[0031] The fixing pin 40 shown in Figures 3 and 4 is a member fixed to the support member 30. The fixing pin 40 has a cylindrical portion 41, a spherical portion 42, and a connecting portion 43. The cylindrical portion 41 is a cylindrical portion whose axial direction faces the up-down direction. The cylindrical portion 41 is fixed to the first through hole 31. The spherical portion 42 is a portion formed into a substantially spherical shape. The spherical portion 42 is formed above the cylindrical portion 41. The connecting portion 43 is a portion that connects the cylindrical portion 41 and the spherical portion 42. The spherical portion 42 and the connecting portion 43 are located above the support member 30.

[0032] The movable pin 50 shown in Fig. 4(b) and Fig. 5 is a member that is movable in the up-down direction relative to the support member 30. The movable pins 50 are provided in the left and right second through holes 32L and 32R, respectively. Hereinafter, the movable pin 50 provided in the left second through hole 32L will be referred to as the "left movable pin 50L". Also, the movable pin 50 provided in the right second through hole 32R will be referred to as the "right movable pin 50R". Hereinafter, the configuration of the movable pin 50 will be described using the right movable pin 50R as an example. The movable pin 50 has a cylindrical portion 51, a spherical portion 52, and a connection portion 53.

[0033] The cylindrical portion 51 is a cylindrical portion whose axial direction faces the up-down direction. The outer diameter of the cylindrical portion 51 is smaller than the inner diameter of the second through hole 32. The cylindrical portion 51 is accommodated in the second through hole 32. As shown in Figs. 5 and 6(a), the cylindrical portion 51 has a first recess 51a and a second recess 51b.

[0034] The first recess 51a and the second recess 51b are formed on the outer circumferential surface of the cylindrical portion 51 so as to be recessed leftward (toward the center of the cylindrical portion 51). The first recess 51a is formed in a substantially hemispherical shape so as to fit along a ball 92 of a restriction mechanism 90 (to be described later). The first recess 51a is formed in the lower part of the cylindrical portion 51.

[0035] The second recess 51b is formed to extend from the first recess 51a in the up-down direction (the moving direction of the movable pin 50). The depth of the second recess 51b is shallower than that of the first recess 51a. The magnitude relationship between the depths of the first recess 51a and the second recess 51b is not limited to this embodiment. For example, the first recess 51a and the second recess 51b may have the same depth. The second recesses 51b are formed respectively above and below the first recess 51a. As shown in FIG. 6(a), the upper second recess 51b has a sharpened portion 51c and a straight portion 51d.

[0036] The sharp tip portion 51c is a portion formed in a tapered shape such that the left-right width decreases toward the first recess 51a. The straight portion 51d is a portion extending in the up-down direction with a constant left-right width. The straight portion 51d is formed in a generally arc shape in a planar cross section (see FIG. 6(b)). The straight portion 51d is formed to extend from the sharp tip portion 51c to the upper end of the cylindrical portion 51.

[0037] The lower second recess 51b has only the sharp tip portion 51c among the above-mentioned sharp tip portion 51c and straight portion 51d. The lower second recess 51b may also have the straight portion 51d depending on the amount of movement of the movable pin 50, the vertical position of the first recess 51a, and the like.

[0038] 5 and 6(a) is formed above the cylindrical portion 51. The spherical portion 52 is formed in the same shape as the spherical portion 42 of the fixing pin 40.

[0039] The connecting portion 53 is a portion that connects the cylindrical portion 51 and the spherical portion 52. The connecting portion 53 is formed in a substantially cylindrical shape. The connecting portion 53 has a flat portion 53a. The flat portion 53a is disposed above the first recess 51a and the second recess 51b and facing rightward. The flat portion 53a is located above the second through hole 32.

[0040] The cable 60 shown in Fig. 5 is for transmitting the operating force of the operating lever 80 to the control valve 16. The cable 60 is formed in a longitudinal (linear) shape and has flexibility. The cable 60 connects the left and right moving pins 50L, 50R to the control valve 16, respectively. The cable 60 includes an outer cable 61 and an inner cable 62.

[0041] The outer cable 61 is formed so as to cover the inner cable 62. One end of the outer cable 61 is connected to the support member 30. The other end of the outer cable 61 is fixed to the vehicle body near the control valve 16 shown in FIG.

[0042] One end of the inner cable 62 shown in Fig. 5 protrudes upward from one end of the outer cable 61 and is connected to the movable pin 50. The other end of the inner cable 62 protrudes from the other end of the outer cable 61 and is connected to the spool of the control valve 16 shown in Fig. 1. More specifically, the other end of the outer cable 61 is connected to the spool by inserting a pin into a hole formed in the spool.

[0043] The connecting member 70 shown in Figures 2, 3, and 4(a) is a member to which the operating lever 80 is connected. The connecting member 70 is formed in a plate shape with its plate surface facing in the up-down direction. The connecting member 70 is disposed above the support member 30. The connecting member 70 has a first notch 71 and a second notch 72.

[0044] 3 and 4(a) has a generally semicircular cross-sectional shape with an opening facing downward, and is formed so as to extend from the left front end to the right rear of the connecting member 70. The first notch 71 is formed in the left front part (above the first through hole 31) of the connecting member 70. The first notch 71 receives the spherical portion 42 of the fixing pin 40.

[0045] The second cutouts 72 are formed in the left rear portion (above the left second through hole 32) and the right front portion (above the right second through hole 32) of the connecting member 70. The left rear second cutout 72 has a substantially semicircular cross-sectional shape with an opening facing downward, and is formed so as to extend forward from the rear side surface of the connecting member 70. The left rear second cutout 72 receives the spherical portion 52 of the left moving pin 50L. The right front second cutout 72 has a substantially semicircular cross-sectional shape with an opening facing downward, and is formed so as to extend leftward from the right side surface of the connecting member 70. The right front second cutout 72 receives the spherical portion 52 of the right moving pin 50R.

[0046] The operating lever 80 shown in Fig. 2 is a member that can be operated by an operator. The operating lever 80 is formed by appropriately bending a rod-shaped member. The lower end of the operating lever 80 is connected to the connecting member 70. The lower end of the operating lever 80 is located at a position that does not overlap with the fixed pin 40 and the movable pin 50 in a plan view (see Fig. 4).

[0047] As shown in FIG. 2, the operating lever 80 is configured to be operable in the left-right direction and the front-rear direction from a neutral position. When the operating lever 80 is moved in the left-right direction, the connecting member 70 swings left and right with the fixed pin 40 as a fulcrum. With this swing, the right front part of the connecting member 70 swings up and down, and the right movable pin 50R housed in the second cutout part 72 of the right front part moves up and down. Thus, as shown in FIG. 5, the right movable pin 50R slides up and down relative to the second through hole 32R on the right side of the support member 30. With this sliding, the cable 60 (inner cable 62) connected to the right movable pin 50R moves up and down, and the spool of the control valve 16 is displaced to control the bucket cylinder 15. This allows the operator to operate the bucket 13 in response to the left-right operation of the operating lever 80.

[0048] When the operating lever 80 shown in FIG. 2 is swung forward and backward, the connecting member 70 swings forward and backward around the fixed pin 40 as a fulcrum. The swing causes the left rear part of the connecting member 70 to swing up and down, and the left movable pin 50L housed in the second cutout 72 of the left rear part is moved up and down. Thus, as shown in FIG. 5, the left movable pin 50L slides up and down relative to the second through hole 32L on the left side of the support member 30. The sliding causes the cable 60 (inner cable 62) connected to the left movable pin 50L to move up and down, displacing the spool of the control valve 16 and controlling the boom cylinder 14. This allows the operator to operate the boom 12 in response to the operation of the operating lever 80 in the forward and backward directions.

[0049] Here, due to the influence of a gap that occurs between the outer cable 61 and the inner cable 62, a gap that occurs at the connection portion between the spool and the cable 60 (between the hole portion of the spool and the pin), etc., the spool may not be displaced (only the cable 60 may move) until the operating lever 80 is operated by more than a predetermined amount from near the neutral position. If there is an operating range (backlash) within which the spool does not displace, the operating lever 80 may move (wobble) unintentionally near the center position due to vibrations while the tractor 1 is traveling, etc.

[0050] The restricting mechanism 90 shown in Figs. 4 and 5 is intended to reduce the effect of the rattle described above (rattle during travel) by restricting the movement of the movable pin 50 located in the neutral position. The restricting mechanism 90 is provided on the support member 30. One restricting mechanism 90 is provided for each movable pin 50. The configuration of the restricting mechanism 90 will be described below using the restricting mechanism 90 that restricts the movement of the right-side movable pin 50R as an example. The restricting mechanism 90 includes a housing member 91, a ball 92, and a spring 93.

[0051] The accommodating member 91 shown in Fig. 5 is a member for accommodating a ball 92 and a spring 93. The accommodating member 91 is formed in a generally cylindrical shape with a bottom. The axial direction of the accommodating member 91 faces the left-right direction. The accommodating member 91 is also arranged so that its opening faces leftward (second through hole 32). A male screw portion (not shown) is formed on the outer circumferential surface of the accommodating member 91. The accommodating member 91 is attached to the support member 30 by being screwed into the communication hole 33.

[0052] The ball 92 is disposed in the opening (the end on the second through-hole 32 side) of the support member 30. A part of the ball 92 protrudes from the opening. The ball 92 abuts (engages) with the first recess 51a of the movable pin 50 when the operating lever 80 is in the neutral position (the state shown in FIG. 5).

[0053] The spring 93 is for biasing the ball 92 leftward (toward the moving pin 50). The spring 93 is housed in the housing member 91, and is disposed between the bottom (right end) of the housing member 91 and the ball 92. Note that, although the spring 93 is configured by a compression coil spring in this embodiment, the biasing member that biases the ball 92 is not limited to a compression coil spring, and may be another type of spring or an elastic body such as resin.

[0054] According to the restriction mechanism 90, when the right-side movable pin 50R attempts to move up or down while the operation lever 80 is in the neutral position, the ball 92 attempts to climb over the first recessed portion 51a. At this time, the ball 92 is pressed against the first recessed portion 51a by the spring 93, restricting the movement of the movable pin 50R in the up or down direction. This makes it possible to suppress the operation lever 80 from rattling in the left or right direction near the neutral position due to vibrations while the tractor 1 is traveling, etc.

[0055] In particular, in this embodiment, not only the right movable pin 50R but also the left movable pin 50L is restricted in movement by the restricting mechanism 90. This makes it possible to suppress back and forth wobbling of the operating lever 80 near the neutral position, thereby effectively reducing the effects of wobble.

[0056] Furthermore, when the operator applies an operating load of a predetermined value or more to the operating lever 80 that is in the neutral position, the moving pin 50 can be moved up and down against the biasing force of the spring 93. When the ball 92 overcomes the first recess 51a as a result of this movement, the second recess 51b comes into contact with the ball 92. When the operating lever 80 is further operated in this state, the moving pin 50 moves up and down while the ball 92 is guided by the second recess 51b. Thus, in this embodiment, even after the ball 92 overcomes the first recess 51a, the other recess (second recess 51b) continues to allow the ball 92 to escape toward the second through-hole 32.

[0057] This allows the biasing force of the spring 93 to be relatively small, thereby preventing an increase in the operating load after the operating lever 80 is moved from the neutral position, and preventing a decrease in operability.

[0058] Moreover, the accommodating member 91 of the present embodiment is screwed into the communication hole 33. With this configuration, by adjusting the amount that the accommodating member 91 is screwed into the communication hole 33, the biasing force of the spring 93 can be easily adjusted.

[0059] In this embodiment, the flat surface portion 53a of the movable pin 50 is disposed between the support member 30 and the connecting member 70 (see FIG. 3). This configuration makes the flat surface portion 53a visible from the outside, so that the circumferential positions of the first recessed portion 51a and the second recessed portion 51b can be easily grasped using the flat surface portion 53a as a landmark.

[0060] As described above, the operation mechanism 20 of the front loader 11 in this embodiment comprises the operation lever 80, the movable pin 50 (moving member) which is movable in a predetermined direction (up and down) in response to operation of the operation lever 80 and is connected to the control valve 16, and the regulating mechanism 90 which regulates the movement of the movable pin 50 when the operation lever 80 is operated to the neutral position.

[0061] With this configuration, the effect of rattle of the operating lever 80 can be reduced.

[0062] In addition, the regulating mechanism 90 includes a ball 92 (abutment member) that can abut against the surface of the movable pin 50, and a spring 93 (biasing member) that biases the ball 92 toward the movable pin 50 (see FIG. 5).

[0063] By configuring in this way, the influence of rattle of the operating lever 80 can be reduced with a simple configuration.

[0064] Further, the moving pin 50 has a first recess 51a that can be engaged with the ball 92 when the operating lever 80 is operated to the neutral position (see FIG. 5).

[0065] With this configuration, the influence of rattle of the operating lever 80 can be effectively reduced.

[0066] Further, the moving pin 50 is provided with a second recess 51b which is formed so as to extend along the moving direction (up-down direction) of the moving pin 50 and guides the ball 92 (see FIG. 5).

[0067] With this configuration, an increase in the operating load of the operating lever 80 due to the provision of the restriction mechanism 90 can be suppressed.

[0068] The device further includes a support member 30 having a second through hole 32 (accommodating portion) for accommodating the movable pin 50, and the regulating mechanism 90 is provided in a communication hole 33 that connects the outer surface of the support member 30 with the second through hole 32 (see Figure 5).

[0069] With this configuration, the restriction mechanism 90 can be easily provided from the outside of the support member 30.

[0070] In addition, the moving pin 50 includes a boom moving member (left side moving pin 50L) for controlling the operation of the boom 12 of the front loader 11, and a bucket moving member (right side moving pin 50R) for controlling the operation of the bucket 13 of the front loader 11.

[0071] With this configuration, the influence of rattle of the operating lever 80 in two operating directions (directions in which the boom 12 and the bucket 13 are operated) can be reduced.

[0072] As described above, the tractor 1 (work vehicle) according to this embodiment is equipped with the operation mechanism 20 for the front loader 11.

[0073] With this configuration, the effect of rattle of the operating lever 80 can be reduced.

[0074] The moving pin 50 according to this embodiment is one embodiment of a moving member according to the present invention. Moreover, the ball 92 according to this embodiment is one embodiment of a contact member according to the present invention. Moreover, the spring 93 according to this embodiment is one embodiment of the biasing member according to the present invention. Moreover, the second through hole 32 according to this embodiment is one embodiment of a storage portion according to the present invention. Moreover, the tractor 1 according to this embodiment is one embodiment of a work vehicle according to the present invention.

[0075] Although the 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.

[0076] For example, the work vehicle according to this embodiment is a tractor 1, but the type of work vehicle is not limited to this. The work vehicle may be other agricultural vehicles, construction vehicles, industrial vehicles, etc.

[0077] Further, in this embodiment, the movement of each of the left and right movable pins 50L and 50R is restricted, but the restriction mechanism 90 according to the present invention may be configured to restrict the movement of at least one of the movable pins 50.

[0078] Furthermore, the configuration of the restriction mechanism 90 is not limited to this embodiment as long as it is capable of restricting the movement of the movable pin 50. For example, it is also possible to abut a member having a shape other than a sphere (ball 92) against the movable pin 50.

[0079] Moreover, the first recess 51a is formed in a substantially hemispherical shape, but the shape of the first recess 51a can be appropriately changed depending on the shape of the abutting member that abuts against the moving pin 50, etc. The second recess 51b is formed in a substantially arc shape in a plan cross section, but the shape of the second recess 51b can be appropriately changed depending on the shape of the abutting member, etc.

[0080] Furthermore, the movable pin 50 is described as being movable up and down in response to the operation of the operating lever 80, but this is merely an example, and the moving direction of the movable pin 50 can be changed as desired.

[0081] In addition, the second through hole 32 and the movable pin 50 (cylindrical portion 51) are formed to have a circular shape in a plan view, but this is only an example, and they may be formed to have a shape other than a circle in a plan view. For example, as shown in Fig. 7, the second through hole 32 and the movable pin 50 may be formed to have a shape in which a part of a circle is cut out in a plan view. In Fig. 7, the second through hole 32 and the movable pin 50 are formed with flat surfaces 32a-51e facing in the left-right direction. With this configuration, when the movable pin 50 tries to rotate around its axis, the flat surfaces 32a-51e come into contact with each other, and the rotation of the movable pin 50 can be restricted.

[0082] As described above, the moving pin 50 has a flat portion 51e (rotation restricting portion) that restricts rotation about an axis parallel to the moving direction (up-down direction) of the moving pin 50.

[0083] With this configuration, it is possible to easily position the moving pin 50 relative to the support member 30 (accommodating portion). This allows the moving pin 50 (cylindrical portion 51) to be quickly accommodated in the support member 30.

[0084] The flat surface portion 51e shown in FIG. 7 is one embodiment of the rotation restricting portion according to the present invention. The rotation restricting portion is not limited to the flat portion 51e as long as it is capable of restricting the rotation of the movable pin 50. For example, the rotation restricting portion may be an uneven portion or the like formed on the cylindrical portion 51. [Explanation of symbols]

[0085] 1 Tractor 11 Front loader 20 Operating mechanism 50 Moving Pin 80 Operating lever 90 Regulatory Mechanisms

Claims

1. An operating lever; a moving member that is movable in a predetermined direction in response to an operation of the operating lever and is connected to a control valve; a restricting mechanism that restricts movement of the movable member when the operating lever is in a neutral position; An operating mechanism for a front loader comprising:

2. The regulating mechanism is a contact member capable of contacting a surface of the moving member; a biasing member that biases the contact member toward the moving member; Equipped with 2. The operating mechanism for a front loader according to claim 1.

3. The moving member is a first recess that is engageable with the abutment member when the operating lever is in a neutral position; 3. The operating mechanism for a front loader according to claim 2.

4. The moving member is A second recess is formed to extend along the moving direction of the moving member and guide the contact member.

4. The operating mechanism for a front loader according to claim 3.

5. The present invention further includes a support member having a housing portion for housing the moving member, The regulating mechanism is A communication hole is provided in the support member, the communication hole communicating with the outer surface of the support member and the storage portion.

3. The operating mechanism for a front loader according to claim 2.

6. The moving member is A rotation restricting portion restricts rotation of the movable member about an axis parallel to the moving direction of the movable member.

6. The operating mechanism for a front loader according to claim 5.

7. The moving member is a boom moving member for controlling the operation of the boom of the front loader; A bucket moving member for controlling the operation of a bucket of the front loader; Including, 2. The operating mechanism for a front loader according to claim 1.

8. The operation mechanism for a front loader according to any one of claims 1 to 7 is provided. Work vehicle.

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