Work vehicle

Abstract

To provide a work vehicle which can improve convenience.SOLUTION: A work vehicle 1 comprises: a main shift lever 20 (shift operation tool) which can perform shift operation; a changeover mechanism 100 which can change the main shift lever 20 between a stepped transmission operation state where shift operation of the main shift lever can be performed in stages and a stepless transmission operation state where shift operation of the main shift lever 20 can be performed steplessly; and a main shift lever 20 (changeover operation tool) which can perform an operation to change the states of the changeover mechanism 100. The changeover mechanism 100 includes: a support part 110 (engaged part) which is arranged in a vehicle body and has a plurality of groove parts 112 (recess parts) corresponding to shift position of the main shift lever 20 (shift operation tool); and engagement part 130 which can be movable relatively to the main shift lever 20. The main shift lever 20 (shift operation tool) can switch the engagement part 130 between a position where the engagement part can engage with the groove part 112 and a position where the engagement part cannot engage with the groove part 112.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to the technology of a work vehicle equipped with a transmission operation tool capable of transmission operation.

Background Art

[0002] Conventionally, the technology of a work vehicle equipped with a transmission operation tool capable of transmission operation has been known. For example, it is as described in Patent Document 1.

[0003] Patent Document 1 describes a tractor equipped with a main transmission lever capable of operating a transmission. As a transmission method of a transmission operation tool such as a transmission lever or a transmission pedal, there are a stepped transmission method in which the stop position of the main transmission lever is determined stepwise, and a stepless transmission method in which the main transmission lever can be stopped at an arbitrary position.

[0004] However, in the stepless transmission method where the stop position of the lever is arbitrary, there is a drawback that the reproducibility of the stop position is low and it is difficult to adjust to the target speed. For example, in the case of a tractor, an appropriate working vehicle speed is determined for each attached implement, and it is desirable to perform the same work at the same vehicle speed. On the other hand, in the stepped transmission method where the stop position of the lever is determined, although the reproducibility of the stop position is high, there is a problem that it hinders a sensory and smooth operation and it is difficult to finely adjust the speed. Thus, there has been a problem in terms of convenience in conventional work vehicles.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] One aspect of the present disclosure has been made in view of the above circumstances, and the problem to be solved is to provide a work vehicle that can improve convenience.

Means for Solving the Problem

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

[0008] In one aspect of the present disclosure, there is provided a shift operation tool capable of shift operation, a stepped shift operation state in which the shift operation tool can be shifted step by step, a stepless shift operation state in which the shift operation tool can be shifted steplessly, a switching mechanism capable of switching between them, and a switching operation tool capable of operating to switch the state of the switching mechanism. The switching mechanism is provided on the vehicle body and includes an engaged portion provided with a plurality of recesses according to the shift position of the shift operating tool, and an engaging portion provided so as to be relatively movable with respect to the shift operating tool. The switching operating tool can switch the engaging portion between a position where it can engage with the recess and a position where it cannot engage with the recess, and the switching mechanism includes a link mechanism that interlocks and connects the switching operating tool and the engaging portion. It is. According to one aspect of the present disclosure, convenience can be improved. That is, since it is possible to arbitrarily switch between a stepped shift operation (step shift) and a stepless shift operation (stepless shift), a preferable operation method can be used according to the application of the work vehicle. Thereby, the convenience of the work vehicle can be improved. Further, according to one aspect of the present disclosure, by switching the position of the engaging portion, it is possible to switch to a stepped shift operation state. Also, a stepped shift operation state can be realized with a relatively simple configuration. Further, according to one aspect of the present disclosure, the switching mechanism can have a relatively simple configuration.

[0009] In one aspect of the present disclosure, A shift operating tool capable of shift operation, a stepped shift operation state in which the shift operating tool can be shifted step by step, a continuously variable shift operation state in which the shift operating tool can be shifted continuously, and a switching mechanism capable of switching between them, and a switching operating tool capable of operating to switch the state of the switching mechanism. the switching mechanism is provided on the vehicle body, and includes an engaged portion provided with a plurality of recesses according to the shift position of the shift operation tool, and an engaging portion provided so as to be relatively movable with respect to the shift operation tool. The switching operation tool can switch the engaging portion between a position where it can be engaged with the recess and a position where it cannot be engaged with the recess. The switching mechanism includes a wire mechanism that interlocks and connects the switching operating tool and the engaging portion using a wire. It is. According to one aspect of the present disclosure, convenience can be improved. That is, since it is possible to arbitrarily switch between a stepped shift operation (step shift) and a continuously variable shift operation (continuously variable shift), a preferable operation method can be used according to the use of the work vehicle. Thereby, the convenience of the work vehicle can be improved. Also, According to one aspect of the present disclosure, by switching the position of the engaging portion, it is possible to switch to the stepped shift operation state. Also, a stepped shift operation state can be realized with a relatively simple configuration. Further, according to one aspect of the present disclosure, the switching mechanism can have a relatively simple configuration.

[0010] In one aspect of the present disclosure, the switching mechanism includes a biasing portion that constantly biases the engaging portion toward the engaged portion. According to one aspect of the present disclosure, by constantly biasing the engaging portion toward the engaged portion, it is possible to smoothly switch to the stepped shifting operation state.

[0013] In one aspect of the present disclosure, the switching mechanism includes a first contact portion provided on the vehicle body and a second contact portion provided on the shifting operation tool, the operation of the shifting operation tool being regulatable at an arbitrary shifting position by the frictional force between the first contact portion and the second contact portion. According to one aspect of the present disclosure, by utilizing the frictional force between the first contact portion and the second contact portion, it is possible to realize a continuously variable transmission operation state. Further, by switching the engaging portion to a position where it cannot be engaged with the concave portion (see claim 2), it is possible to switch to the continuously variable transmission operation state.

[0014] In one aspect of the present disclosure, the engaged portion and the first contact portion are constituted by a common member. According to one aspect of the present disclosure, it is possible to simplify the configuration of the switching mechanism.

[0015] In one aspect of the present disclosure, the switching operation tool and the shifting operation tool are constituted by a common member. According to one aspect of the present disclosure, it is possible to simplify the configuration of the switching mechanism.

[0016] In one aspect of the present disclosure, the switching operation tool is constituted by a gripping portion of the shifting operation tool, and by rotating the gripping portion, the stepped shifting operation state and the continuously variable transmission operation state are switched. According to one aspect of the present disclosure, it is possible to switch between the stepped shifting operation state and the continuously variable transmission operation state with a simple operation.

[0017] In one aspect of the present disclosure, the switching operation tool and the shifting operation tool are constituted by different members. According to one aspect of the present disclosure, the stepped shifting operation state and the continuously variable transmission operation state can be switched by a member different from the shifting operation tool.

Effects of the Invention

[0018] According to one aspect of the present disclosure, convenience can be improved.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Mode for Carrying Out the Invention

[0020] Hereinafter, the directions indicated by the arrows U, D, F, B, L, and R in the figure will be defined as the upward, downward, forward, backward, leftward, and rightward directions, respectively, and the description will be given.

[0021] Hereinafter, with reference to FIG. 1, the tractor 1 according to the first embodiment of the present invention will be described.

[0022] The tractor 1 mainly includes a body frame 2, an engine 3, a transmission case 4, front wheels 5, rear wheels 6, fenders 7, a cabin 8, a seat 9, and the like.

[0023] The body frame 2 is a frame-shaped member formed by appropriately combining a plurality of plate materials. The body frame 2 is formed in a substantially rectangular shape in plan view. The body frame 2 is provided at the front portion of the tractor 1 with its longitudinal direction oriented in the front-rear direction. The engine 3 is disposed at the rear portion of the body frame 2. A transmission case 4 is fixed to the rear portion of the engine 3.

[0024] The front portion of the body frame 2 is supported by a pair of left and right front wheels 5 via a front axle mechanism (not shown). The rear portion 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 pair of left and right rear wheels 6 are generally covered by the fenders 7 from above.

[0025] A transmission case 4 houses a transmission (not shown). As the transmission, for example, a stepless transmission capable of changing the transmission ratio steplessly, such as an HST (Hydro-Static Transmission) or a CVT (Continuously Variable Transmission), is used. The power of the engine 3 can be transmitted to the front wheels 5 via the front axle mechanism and to the rear wheels 6 via the rear axle mechanism after being shifted by the transmission (not shown). The front wheels 5 and the rear wheels 6 are rotationally driven by the power of the engine 3, and the tractor 1 can travel.

[0026] A cabin 8 is provided behind the engine 3. Inside the cabin 8, a living space for the operator to board is formed. A seat 9 for the operator to sit on is arranged substantially in the center of the cabin 8.

[0027] The cabin 8 is provided with various operating tools such as a sub-shift lever 10 and a main-shift lever 20 shown in FIG. 2. The sub-shift lever 10 and the main-shift lever 20 are provided near the fender 7 on the left side of the seat 9 and are configured to be able to operate the transmission. The tractor 1 also includes a switching mechanism 100 (see FIG. 2 etc.) for switching the state of the main-shift lever 20.

[0028] Hereinafter, with reference to FIGS. 2, 3, and 7, the configuration of the main-shift lever 20 will be described.

[0029] The main-shift lever 20 is for performing a forward / backward switching operation and a traveling speed changing operation. The main-shift lever 20 operates the transmission by moving it forward and backward, and thereby the tractor 1 can be shifted.

[0030] Also, the main-shift lever 20 can perform an operation for switching the state of a switching mechanism 100 described later. The main-shift lever 20 is connected to the switching mechanism 100. The main-shift lever 20 can switch the state of the switching mechanism 100 by rotating a gripping portion 21 described later.

[0031] The main shift lever 20 mainly includes a grip portion 21, a grip portion rotation shaft 22, a cylindrical body 23, a lever main body portion 24, and a lever rotation shaft 25.

[0032] The grip portion 21 shown in FIGS. 2 and 3 is the portion that the operator grips when operating the main shift lever 20. The grip portion 21 is formed in an appropriate shape that is easy for the operator to grip.

[0033] The grip portion rotation shaft 22 shown in FIGS. 2, 3, and 7 is for rotating the grip portion 21. The upper end of the grip portion rotation shaft 22 is fixed to the lower end of the grip portion 21, and it is formed so as to extend substantially downward (rearward and downward) from the lower end of the grip portion 21. A recess 22a is formed in the grip portion rotation shaft 22.

[0034] The recess 22a shown in FIG. 7(b) is formed so that the outer surface of the grip portion rotation shaft 22 is recessed. The recess 22a is formed in a shape corresponding to a ball 162 described later. Two recesses 22a are formed at intervals in the circumferential direction of the grip portion rotation shaft 22 according to the rotation position of the grip portion 21.

[0035] The cylindrical body 23 shown in FIGS. 2, 3, and 7 is a member formed in a cylindrical shape. The cylindrical body 23 is provided so that the axis of the cylindrical body 23 coincides with the axis of the grip portion rotation shaft 22. The cylindrical body 23 is provided so as to insert a part of the grip portion rotation shaft 22 therein. The cylindrical body 23 supports the grip portion rotation shaft 22 so as to be rotatable about the axis. A recess 23a and a through hole 23b are formed in the cylindrical body 23.

[0036] The recess 23a shown in FIG. 7 is formed so that a part (front part) of the outer surface of the cylindrical body 23 is recessed. Although not shown, the recess 23a is formed in substantially the same shape as the outer shape of the cylindrical body 161 in a substantially front view (a view in the axial direction of the cylindrical body 161 of the ball detent mechanism 160 described later).

[0037] The through-hole 23b shown in FIG. 7(b) is the portion through which the ball 162 of the ball detent mechanism 160 described later is inserted. The through-hole 23b is formed so as to penetrate in the radial direction the portion of the side part of the cylindrical body 23 where the recess 23a is formed. The through-hole 23b is formed in substantially the same shape as the outer shape of the ball 162 of the ball detent mechanism 160 in a substantially front view (a view in the axial direction of the cylindrical body 161 of the ball detent mechanism 160 described later).

[0038] The lever main body portion 24 shown in FIGS. 2 to 4 constitutes the main structure of the main transmission lever 20. The upper end portion of the lever main body portion 24 is fixed to the right portion of the cylindrical body 23, and is formed so as to extend obliquely downward while being appropriately bent from the right portion of the cylindrical body 23.

[0039] The lever rotation shaft 25 shown in FIGS. 2 and 3 is for rotating the main transmission lever 20. The lever rotation shaft 25 is fixed to the lower end of the lever main body portion 24, and is formed so as to extend rightward from the lower end of the lever main body portion 24. The lever rotation shaft 25 is rotatably supported by the vehicle body of the tractor 1.

[0040] The main transmission lever 20 formed in this way can swing back and forth around the lever rotation shaft 25. The main transmission lever 20 can operate the transmission device by swinging back and forth to shift the tractor 1. More specifically, the operation amount of the main transmission lever 20 is detected by a shift sensor 27 via a link mechanism 26 connected to the lower part of the main transmission lever 20 (see FIG. 2). According to the detected operation amount, an actuator (not shown) operates, and the gear ratio of the transmission device is changed. Thus, in this embodiment, a configuration in which the gear ratio of the transmission device is electrically controlled based on the operation of the main transmission lever 20 is exemplified, but the present invention is not limited to this, and it can also be applied to a configuration in which the main transmission lever 20 and the transmission device are mechanically connected to change the gear ratio.

[0041] Next, with reference to FIGS. 2 to 7 and the like, the configuration of the switching mechanism 100 will be described.

[0042] The switching mechanism 100 is capable of switching the main transmission lever 20 between a stepped shift operation state and a continuously variable shift operation state. Details of the stepped shift operation state and the continuously variable shift operation state will be described later.

[0043] The switching mechanism 100 mainly includes a support portion 110, a supported portion 120, an engaging portion 130, a wire mechanism 140, a biasing portion 150, and a ball detent mechanism 160.

[0044] The support portion 110 shown in FIGS. 2 to 4 and 6 is a portion that supports the main transmission lever 20 and the like. The support portion 110 is provided on the vehicle body of the tractor 1. The support portion 110 is formed in a plate shape with the plate surface facing in the left - right direction. The support portion 110 is provided on the left side of the middle part in the up - down direction of the main transmission lever 20. The upper end of the support portion 110 is formed in an arc shape centered on the axis of the lever rotation shaft 25 in a side view. An insertion hole 111 and a groove portion 112 are formed in the support portion 110.

[0045] The insertion hole 111 shown in FIGS. 2 to 4 is a portion through which the supported portion 120 described later is inserted. The insertion hole 111 is formed near the center of the support portion 110. The insertion hole 111 is formed in an arc shape centered on the axis of the lever rotation shaft 25 in a side view. Thus, the insertion hole 111 is formed in a concentric arc shape with the upper end of the support portion 110 in a side view.

[0046] The groove portion 112 shown in FIGS. 2 to 4 and 6 is a portion with which the engaging portion 130 (second spacer 134) described later is engaged. The groove portion 112 is formed such that the upper end of the support portion 110 is recessed substantially downward. The groove portion 112 is formed in a substantially arc shape in a side view. A plurality of groove portions 112 are formed according to the shift position of the main transmission lever 20 so as to be continuously arranged along the upper end of the support portion 110.

[0047] The supported portion 120 shown in FIGS. 2 to 5 is provided on the main transmission lever 20 and is a portion supported by the support portion 110. The supported portion 120 includes a collar 121, a spring 122, a friction plate 123, a nut 124, and a bolt 125.

[0048] The color 121 shown in FIGS. 3 to 5 is formed in a cylindrical shape. The color 121 is fitted and fixed to a through-hole provided in the middle part in the vertical direction of the lever main body 24 with its axis oriented in the left-right direction. The color 121 is provided so as to project to the left side and the right side of the lever main body 24.

[0049] The spring 122 shown in FIG. 5(b) generates a biasing force and is, for example, a compression coil spring. The spring 122 is disposed inside the color 121 with its expansion and contraction direction oriented in the axial direction of the color 121.

[0050] The friction plate 123 shown in FIGS. 3 to 5 generates a frictional force between it and the support portion 110. The friction plate 123 is formed in an annular plate shape. The friction plate 123 is provided on the left side and the right side of the support portion 110 respectively with its plate surface oriented in the left-right direction. Hereinafter, the friction plate 123 provided on the left side of the support portion 110 may be referred to as the friction plate 123a, and the friction plate 123 provided on the right side of the support portion 110 may be referred to as the friction plate 123b.

[0051] The friction plate 123a is provided such that its right surface contacts the left surface of the support portion 110. The friction plate 123b is provided such that its left surface contacts the right surface of the support portion 110. The friction plate 123 is arranged such that the center of the friction plate 123 substantially coincides with the axis of the color 121 in a side view.

[0052] The nut 124 shown in FIGS. 3 to 5 is provided on the right side of the color 121. The nut 124 is arranged such that its axial direction substantially coincides with the axis of the color 121.

[0053] The bolt 125 shown in FIGS. 3 to 5 is inserted from the left side of the friction plate 123a into the inside of the color 121 (spring 122) and fastened to the nut 124. As a result, the spring 122 is disposed inside the color 121 in a compressed state. Due to the biasing force of the spring 122 and the fastening force of the bolt 125, the friction plate 123a and the friction plate 123b are pressed against the support portion 110.

[0054] The supported part 120 configured as described above can hold the main shift lever 20 at any shift position by the frictional force between the friction plate 123 and the support part 110. Thereby, the supported part 120 can regulate the operation of the main shift lever 20 at any shift position.

[0055] The engaging part 130 shown in FIGS. 2 to 6 engages with the groove part 112 of the support part 110. The engaging part 130 is provided above the support part 110. The engaging part 130 is connected to the main shift lever 20 via a spring attachment part 151 described later. Thereby, the engaging part 130 can move along the upper end of the support part 110 (in an arc around the axis of the lever rotation shaft 25) as the main shift lever 20 swings back and forth.

[0056] Also, the engaging part 130 is provided so as to be relatively movable with respect to the main shift lever 20 by the operation of a wire mechanism 140 described later. Specifically, the engaging part 130 is provided so as to be movable between a position where it can engage with the groove part 112 (see FIG. 10(a)) and a position where it cannot engage with the groove part 112 (see FIG. 10(b)). The engaging part 130 includes a plate 131, a first spacer 132, a first rivet 133, a second spacer 134, and a second rivet 135.

[0057] The plate 131 shown in FIGS. 3 to 6 constitutes the main structure of the engaging part 130. The plate 131 includes a main body part 131a and a spring attachment part 131b.

[0058] The main body part 131a shown in FIGS. 4 to 6 is a part that supports the first spacer 132 and the second spacer 134 described later. The main body part 131a is formed in a substantially U shape in a front view with the open side facing substantially downward.

[0059] The spring mounting portion 131b shown in FIGS. 4 and 6 is a portion connected to a spring 152 described later. In FIG. 5(a), the illustration of the spring 152 is omitted. The spring mounting portion 131b is provided at the rear end of the main body portion 131a. An attachment hole 131c for engaging the upper end of the spring 152 is formed in the spring mounting portion 131b (see FIGS. 4 and 5(a)).

[0060] The first spacer 132 shown in FIG. 6 is a member formed in a cylindrical shape. The first spacer 132 is disposed inside the front portion of the main body portion 131a with its axis oriented in the left - right direction. The first spacer 132 is fixed to the main body portion 131a by a first rivet 133.

[0061] The second spacer 134 shown in FIGS. 3 to 6 is a member formed in a cylindrical shape. The second spacer 134 is disposed inside the rear portion of the main body portion 131a with its axis oriented in the left - right direction. The second spacer 134 is provided behind (rear - upper) the first spacer 132. The second spacer 134 is fixed to the main body portion 131a by a second rivet 135. The outer diameter of the second spacer 134 is formed to be engageable with the groove portion 112 of the support portion 110.

[0062] The wire mechanism 140 shown in FIGS. 2 to 4 and 6 is for interlock - connecting the main shift lever 20 and the engaging portion 130 using a wire 143. The wire mechanism 140 includes a first rotating plate 141, a second rotating plate 142, a wire 143, a first attachment portion 144, a first pin 145, a second attachment portion 146, and a second pin 147.

[0063] The first rotating plate 141 shown in FIGS. 2 and 3 is provided at the lower end of the gripping portion rotating shaft 22 of the main shift lever 20 and rotates integrally with the gripping portion rotating shaft 22. The first rotating plate 141 is formed below the cylindrical body 23 of the main shift lever 20. The first rotating plate 141 is formed to extend substantially rearward from the lower end of the gripping portion rotating shaft 22 with its plate surface oriented in the axial direction of the gripping portion rotating shaft 22.

[0064] The second moving plate 142 shown in FIG. 3 is provided on the lever main body 24 of the main shift lever 20 so as to be swingable left and right with its plate surface oriented substantially in the front-rear direction. The second moving plate 142 is provided to the right of the first moving plate 141. More specifically, the second moving plate 142 is provided at a position where the upper end portion of the second moving plate 142 can be pressed by the first moving plate 141 when the first moving plate 141 rotates to the right (see FIG. 7(a)).

[0065] The wire 143 shown in FIGS. 2 to 4 and 6 is provided so as to connect the second moving plate 142 and the engaging portion 130. The wire 143 is formed of a flexible material. A first attachment portion 144 is connected to the upper end of the wire 143 (see FIG. 3). The upper end of the wire 143 is connected to the lower portion of the second moving plate 142 by inserting and fixing a first pin 145 through the second moving plate 142 and the first attachment portion 144. A second attachment portion 146 is connected to the lower end of the wire 143 (see FIGS. 3 and 4). The lower end of the wire 143 is connected to the rear portion of the engaging portion 130 by inserting the second attachment portion 146 through a second pin 147 fixed to the upper surface of the main body portion 131a of the engaging portion 130.

[0066] The biasing portion 150 shown in FIGS. 3 to 5 constantly biases the engaging portion 130 toward the support portion 110. The biasing portion 150 includes a spring attachment portion 151 and a spring 152.

[0067] The spring attachment portion 151 shown in FIGS. 4, 5(a) and 6 is for attaching the spring 152 described later. The spring attachment portion 151 is formed in a substantially L shape when viewed from the front. As shown in FIG. 4, the lower end of the spring attachment portion 151 is fixed to the left surface of the lever main body 24 by welding or the like. As shown in FIGS. 5(a) and 6, the upper end of the spring attachment portion 151 is fastened together with the first spacer 132 to the plate 131 by the first rivet 133. In this way, the spring attachment portion 151 connects the engaging portion 130 to the main shift lever 20.

[0068] The spring 152 shown in FIGS. 3 and 4 biases the engaging portion 130 substantially downward. The spring 152 is, for example, a tension coil spring. As shown in FIG. 4, the upper end of the spring 152 is engaged with the mounting hole 131c of the spring mounting portion 131b of the engaging portion 130. The lower end of the spring 152 is engaged with the mounting hole 151a of the spring mounting portion 151.

[0069] By providing the biasing portion 150 configured as described above, the rear portion of the engaging portion 130 is biased substantially downward by the spring 152. As a result, the second spacer 134 of the engaging portion 130 is engaged with the groove portion 112 of the support portion 110.

[0070] The ball detent mechanism 160 shown in FIGS. 2, 3, and 7 holds the gripping portion rotation shaft 22 of the main transmission lever 20 at a predetermined rotation position. The ball detent mechanism 160 is provided in front of the cylindrical body 23 of the main transmission lever 20. The ball detent mechanism 160 includes a cylindrical body 161, a ball 162, a spring 163, a nut 164, and a bolt 165.

[0071] The cylindrical body 161 shown in FIGS. 3 and 7 is a member formed in a cylindrical shape. The cylindrical body 161 is arranged such that the axis of the cylindrical body 161 is perpendicular to the axis of the gripping portion rotation shaft 22. The rear end portion of the cylindrical body 161 is fitted into the concave portion 23a of the cylindrical body 23 of the main transmission lever 20.

[0072] The ball 162 shown in FIG. 7(b) is a member formed in a spherical shape. The ball 162 is accommodated in the through hole 23b of the cylindrical body 23 of the main transmission lever 20 inside the cylindrical body 161.

[0073] The spring 163 shown in FIG. 7(b) biases the ball 162 toward the gripping portion rotation shaft 22. The spring 163 is, for example, a compression coil spring. The spring 163 is arranged inside the cylindrical body 161 with the expansion and contraction direction along the axial direction of the cylindrical body 161 (a direction perpendicular to the axis of the gripping portion rotation shaft 22). The spring 163 is arranged substantially in front of the ball 162.

[0074] The nut 164 shown in FIGS. 3 and 7 is fixed to the front end of the cylindrical body 161 such that the axis of the nut 164 coincides with the axis of the cylindrical body 161.

[0075] The bolt 165 shown in FIGS. 3 and 7 is fastened to the nut 164 from substantially in front of the nut 164. Further, a part (front part) of the bolt 165 is inserted into the cylindrical body 161. Thereby, the spring 163 is held in the cylindrical body 161 in a compressed state.

[0076] With the ball detent mechanism 160 configured in this way, the ball 162 is pressed against the gripping part rotation shaft 22 by the biasing force of the spring 163. When the gripping part 21 (gripping part rotation shaft 22) is in the rotation position shown in FIG. 3, the ball 162 fits into one of the recesses 22a of the gripping part rotation shaft 22. Further, when the gripping part 21 (gripping part rotation shaft 22) is in the rotation position shown in FIG. 9, the ball 162 fits into the other recess 22a of the gripping part rotation shaft 22. In this way, the ball detent mechanism 160 can hold the gripping part 21 (gripping part rotation shaft 22) in two rotation positions (FIGS. 3 and 9).

[0077] Hereinafter, the stepped shift operation state and the continuously variable shift operation state will be described. The stepped shift operation state means a state in which the main shift lever 20 can be shifted stepwise. The continuously variable shift operation state means a state in which the main shift lever 20 can be shifted continuously.

[0078] In the stepped shift operation state, the second spacer 132a of the engaging part 130 is engaged with one of the plurality of groove parts 112 (see FIG. 10(a)). On the other hand, in the continuously variable shift operation state, the second spacer 132a of the engaging part 130 is not engaged with any of the plurality of groove parts 112 (see FIG. 10(b)). Thereby, in the stepped shift operation state, the main shift lever 20 can be shifted stepwise. Also, in the continuously variable shift operation state, the main shift lever 20 can be shifted continuously.

[0079] Hereinafter, with reference to FIGS. 3, 9, and 10, the operations of the main shift lever 20 and the switching mechanism 100 when the main shift lever 20 is switched from the stepped shift operation state to the continuously variable shift operation state will be described.

[0080] First, the operator rotates the grip portion 21 in the counterclockwise direction in a plan view to change the state from that shown in FIG. 3 to that shown in FIG. 9. The grip portion 21 is held at the position shown in FIG. 9 by the ball detent mechanism 160 even when the operator releases the hand from the grip portion 21.

[0081] As shown in FIG. 9, when the grip portion 21 is rotated in the counterclockwise direction in a plan view, the first rotating plate 141 rotates in the counterclockwise direction in a plan view together with the grip portion rotation axis 22 and presses the second rotating plate 142 to the right. As a result, the second rotating plate 142 rotates in the clockwise direction in a rear view.

[0082] As shown in FIG. 9, when the second rotating plate 142 rotates in the clockwise direction in a rear view, the lower portion of the second rotating plate 142 moves upward. Then, the wire 143 fixed to the lower portion of the second rotating plate 142 is pulled upward.

[0083] As a result, an upward force is applied to the rear portion of the engaging portion 130. Here, the first spacer 132 is fixed to the lever main body portion 24. Therefore, as shown in FIG. 10(b), the engaging portion 130 rotates in the counterclockwise direction in a left side view about the axis of the first spacer 132 against the biasing force of the spring 152, and the second spacer 134 moves upward.

[0084] As a result, the second spacer 134 of the engaging portion 130 is separated from the groove portion 112 and is in a state of not engaging with the groove portion 112. At this time, the engaging portion 130 is held at a position where it does not engage with the groove portion 112 by the fact that the grip portion 21 is held at a predetermined rotation position by the ball detent mechanism 160.

[0085] In this way, the main shift lever 20 can be switched from the stepped shift operation state shown in FIG. 10(a) to the continuously variable shift operation state shown in FIG. 10(b).

[0086] When performing a shift operation in the continuously variable transmission operation state, the main shift lever 20 is swung back and forth around the lever rotation axis 25 (see Fig. 8). In the continuously variable transmission operation state, since the second spacer 134 of the engaging portion 130 is not engaged with the groove portion 112, the main shift lever 20 can be stopped at an arbitrary position. The main shift lever 20 is held at an arbitrary stop position by the frictional force of the friction plate 123 between the main shift lever 20 and the support portion 110. Thus, the stop position of the main shift lever 20 is changed, and the shift operation of the tractor 1 can be performed.

[0087] On the other hand, when switching the main shift lever 20 from the continuously variable transmission operation state to the stepped transmission operation state, the operator rotates the grip portion 21 in the clockwise direction in a plan view, changing from the state shown in Fig. 9 to the state shown in Fig. 3. The grip portion 21 is held at the position shown in Fig. 3 by the ball detent mechanism 160 even when the operator releases the hand from the grip portion 21.

[0088] When the grip portion 21 is rotated in the clockwise direction in a plan view, the first rotating plate 141 rotates in the clockwise direction in a plan view together with the grip portion rotation axis 22, and the pressing of the second rotating plate 142 to the right is released. Then, due to the downward biasing force of the spring 152 on the rear portion of the engaging portion 130, the engaging portion 130 rotates in the clockwise direction in a left side view around the axis of the first spacer 132, and the second spacer 134 moves downward.

[0089] As a result, the second spacer 134 of the engaging portion 130 approaches the groove portion 112 and engages with the groove portion 112. Thereby, the engaging portion 130 is held at the position where it engages with the groove portion 112 shown in Fig. 10(a).

[0090] Thus, the main shift lever 20 can be switched from the continuously variable transmission operation state shown in Fig. 10(b) to the stepped transmission operation state shown in Fig. 10(a).

[0091] When performing a stepped shift operation in the stepped shift operation state, the main shift lever 20 is swung back and forth around the lever rotation axis 25 (see Fig. 8). In the stepped shift operation state, the second spacer 134 of the engaging portion 130 is engaged with the groove portion 112. However, when the main shift lever 20 is operated, the second spacer 134 overcomes the groove portion 112 against the biasing force substantially downward of the spring 152. When the main shift lever 20 is not being operated, the second spacer 134 is engaged with one of the groove portions 112 by the biasing force substantially downward of the spring 152. For this reason, the stop position of the main shift lever 20 is determined stepwise according to the groove portion 112. In this way, the stop position of the main shift lever 20 is changed, and the shift operation of the tractor 1 can be performed.

[0092] As described above, in the tractor 1 according to the present embodiment, since the stepped shift operation state and the continuously variable transmission operation state can be arbitrarily switched, a preferable operation method can be used according to the application. Thereby, the convenience of the tractor 1 can be improved.

[0093] For example, in the tractor 1, an appropriate working vehicle speed is determined for each attached implement. For this reason, it is desirable to perform the same work at the same vehicle speed. Therefore, by switching the switching mechanism 100 to the stepped shift operation state, it is easier to set the vehicle speed to the determined value.

[0094] On the other hand, when fine adjustment of the vehicle speed is required, the switching mechanism 100 can be switched to the continuously variable transmission operation state. Thereby, a sensitive and smooth operation can be enabled, and fine adjustment of the speed can be enabled.

[0095] Further, since the engaging portion 130 is constantly biased toward the groove portion 112 by the biasing portion 150, the switching to the stepped shift operation state can be performed smoothly.

[0096] Further, since the member in which the groove portion 112 is formed and the member with which the friction plate 123 contacts are constituted by a common member (support portion 110), the configuration of the switching mechanism 100 can be simplified.

[0097] In addition, since the member for operating to switch the state of the switching mechanism 100 and the member for performing a shift operation are constituted by a common member (main shift lever 20), simplification of the configuration of the switching mechanism 100 can be achieved.

[0098] Further, by rotating the grip portion 21, it is possible to switch between a stepped shift operation state and a stepless shift operation state, so that the switching operation can be performed with a simple operation.

[0099] As described above, the tractor 1 according to the present embodiment has a main shift lever 20 (shift operating tool) capable of performing a shift operation, a switching mechanism 100 capable of switching between a stepped shift operation state in which the main shift lever 20 can be stepwise shifted and a stepless shift operation state in which the main shift lever 20 can be steplessly shifted, and a main shift lever 20 (switching operating tool) capable of operating to switch the state of the switching mechanism 100. It is equipped with.

[0100] By configuring in this way, convenience can be improved. That is, since it is possible to arbitrarily switch between a stepped shift operation (step shift) and a stepless shift operation (stepless shift), a preferable operation method can be used according to the use of the work vehicle. Thereby, the convenience of the work vehicle can be improved.

[0101] In addition, the switching mechanism 100 is provided on the vehicle body, and has a support portion 110 (engaged portion) in which a plurality of groove portions 112 (recesses) are formed according to the shift position of the main shift lever 20 (shift operating tool), and an engaging portion 130 provided so as to be relatively movable with respect to the main shift lever 20. It is equipped with The main shift lever 20 (switching operating tool) can switch the engaging portion 130 between a position where it can be engaged with the groove portion 112 and a position where it cannot be engaged with the groove portion 112.

[0102] By configuring in this way, by switching the position of the engaging portion 130, it is possible to switch to the stepped shift operation state. Also, with a relatively simple configuration, the stepped shift operation state can be realized.

[0103] Also, the switching mechanism 100 includes a biasing portion 150 that constantly biases the engaging portion 130 toward the support portion 110 (engaged portion).

[0104] By configuring in this way, by constantly biasing the engaging portion 130 toward the support portion 110, the switching to the stepped shift operation state can be smoothly performed.

[0105] Also, the switching mechanism 100 includes a wire mechanism 140 that interlocks and connects the main shift lever 20 (switching operation tool) and the engaging portion 130 using a wire 143.

[0106] By configuring in this way, the switching mechanism 100 can have a relatively simple configuration.

[0107] Also, the switching mechanism 100 includes a support portion 110 (first contact portion) provided on the vehicle body, and a supported portion 120 (second contact portion) provided on the main shift lever 20 (shift operation tool) and capable of restricting the operation of the main shift lever 20 at an arbitrary shift position by the frictional force between the supported portion 120 and the support portion 110. and.

[0108] By configuring in this way, by utilizing the frictional force between the support portion 110 (first contact portion) and the supported portion 120 (second contact portion), the continuously variable transmission operation state can be realized. Also, by switching the engaging portion 130 to a position where it cannot be engaged with the groove portion 112, the continuously variable transmission operation state can be switched.

[0109] Further, the engaged portion and the first contact portion are configured by a common member (support portion 110).

[0110] By configuring in this way, simplification of the configuration of the switching mechanism 100 can be achieved.

[0111] Further, the switching operation tool and the speed change operation tool are configured by a common member (main speed change lever 20).

[0112] By configuring in this way, simplification of the configuration of the switching mechanism 100 can be achieved.

[0113] Further, the main speed change lever 20 (switching operation tool) is constituted by a grip portion 21 of the main speed change lever 20 (speed change operation tool), and by rotating the grip portion 21, the stepped speed change operation state and the stepless speed change operation state are switched.

[0114] By configuring in this way, the stepped speed change operation state and the stepless speed change operation state can be switched with a simple operation.

[0115] Note that the tractor 1 according to the present embodiment is one embodiment of the work vehicle according to the present invention. Further, the main speed change lever 20 according to the present embodiment is one embodiment of the speed change operation tool and the switching operation tool according to the present invention. Further, the support portion 110 according to the present embodiment is one embodiment of the first contact portion and the engaged portion according to the present invention. Further, the supported portion 120 according to the present embodiment is one embodiment of the second contact portion according to the present invention.

[0116] Hereinafter, with reference to FIGS. 11 and 12, the tractor 1A according to the second embodiment will be described.

[0117] The tractor 1A according to the second embodiment is different from the tractor 1 according to the first embodiment in that it is provided with a switching mechanism 200 instead of the switching mechanism 100. Further, the switching mechanism 200 is different from the switching mechanism 100 in that it is provided with an engaging portion 230 instead of the engaging portion 130 and a link mechanism 240 instead of the wire mechanism 140. Therefore, hereinafter, the same components as those in the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

[0118] The engaging portion 230 engages with the groove portion 112 of the support portion 110. The difference between the engaging portion 230 and the engaging portion 130 of the first embodiment is that the engaging portion 230 further includes a link engaging portion 231b. Therefore, hereinafter, the same components as those of the engaging portion 130 of the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

[0119] The link engaging portion 231b is a portion connected to the link mechanism 240 described later. The link engaging portion 231b is fixed to the upper rear side of the main body portion 131a. The link engaging portion 231b is formed in a substantially L shape in side view. The link engaging portion 231b is formed so as to extend substantially upward from the upper portion of the main body portion 131a and then bend and extend substantially rearward.

[0120] The link mechanism 240 interlocks and connects the main shift lever 20 and the engaging portion 230. The link mechanism 240 includes a first rotating plate 141, a rod 242, and an arm 243. Since the first rotating plate 141 is the same as that in the first embodiment, the description thereof will be omitted.

[0121] The rod 242 is provided to connect the first rotating plate 141 and the arm 243 described later. The rod 242 is formed in a long bar shape without flexibility. The upper end of the rod 242 is inserted through the tip (radially outward) of the first rotating plate 141. The rod 242 is formed so as to extend substantially rightward and downward while being appropriately bent from the tip of the first rotating plate 141. The rod 242 is formed so that its lower end extends to the right and above the link engaging portion 231b.

[0122] The arm 243 is provided on the lever main body 24 of the main speed change lever 20 so as to be swingable left and right with its plate surface facing substantially in the front-rear direction. The arm 243 is formed in a substantially L-shaped plate form. The lower end of the rod 242 is inserted into the upper end of the arm 243. The arm 243 is formed so as to extend substantially downward from the lower end of the rod 242 and then bend and extend substantially leftward. The left end of the arm 243 is formed so as to extend below the link engagement portion 231b.

[0123] Hereinafter, with reference to FIGS. 11 and 12, the operations of the main speed change lever 20 and the switching mechanism 200 when switching the main speed change lever 20 from the stepped speed change operation state to the continuously variable speed change operation state will be described.

[0124] First, the operator rotates the grip portion 21 in the counterclockwise direction in a plan view from the state shown in FIG. 11 to the state shown in FIG. 12. The grip portion 21 is held at the position shown in FIG. 12 by the ball detent mechanism 160 even when the operator releases the hand from the grip portion 21.

[0125] As shown in FIG. 12, when the grip portion 21 is rotated in the counterclockwise direction in a plan view, the first rotating plate 141 rotates in the counterclockwise direction in a plan view together with the grip portion rotation axis 22. Then, since the distance between the tip of the first rotating plate 141 and the rotation center of the arm 243 becomes shorter, the arm 243 rotates clockwise in a rear view, and the left end of the arm 243 is lifted upward. The link engagement portion 231b is lifted upward by the left end of the arm 243.

[0126] As a result, an upward force is applied to the rear portion of the engagement portion 130. Here, the first spacer 132 is fixed to the lever main body 24 via the spring attachment portion 151. For this reason, the engagement portion 130 rotates in the counterclockwise direction in a left side view around the axis of the first spacer 132 against the biasing force of the spring 152, and the second spacer 134 moves upward (see FIG. 10(b)).

[0127] As a result, the second spacer 134 of the engaging portion 130 is separated from the groove portion 112 and is in a state of not engaging with the groove portion 112. At this time, the engaging portion 130 is held at a position where it does not engage with the groove portion 112 by the ball detent mechanism 160 holding the gripping portion 21 at a predetermined rotational position.

[0128] In this way, the main transmission lever 20 can be switched from the stepped transmission operation state to the continuously variable transmission operation state.

[0129] As described above, the switching mechanism 200 includes a link mechanism 240 that interlocks and connects the main transmission lever 20 and the engaging portion 230.

[0130] By configuring it in this way, the switching mechanism 200 can have a relatively simple configuration.

[0131] Hereinafter, the tractor 1B according to the third embodiment will be described with reference to FIG. 13.

[0132] The difference between the tractor 1B according to the third embodiment and the tractor 1 according to the first embodiment is that it includes a switching mechanism 300 instead of the switching mechanism 100. Therefore, hereinafter, for the same configurations as those in the first embodiment, the same reference numerals will be given and the description will be omitted.

[0133] The switching mechanism 300 includes a support portion 310, a supported portion 120, an engaging portion 330, and a switching operation tool 340. Since the supported portion 120 is the same as that in the first embodiment, the description thereof will be omitted.

[0134] The support portion 310 is a portion that supports the main transmission lever 20 and the like. The support portion 310 is provided on the vehicle body of the tractor 1. The support portion 310 is formed in a plate shape with the plate surface facing in the left-right direction. The support portion 310 is provided to the right of the middle part in the up-down direction of the main transmission lever 20. An insertion hole 311 and a recess 312 are formed in the support portion 310.

[0135] The insertion hole 311 is a portion through which the supported portion 120 is inserted. The insertion hole 311 is formed near the center of the support portion 310. The insertion hole 311 is formed in an arc shape centered on the axis of the lever rotation axis 25 (see FIGS. 2 and 3) in a side view.

[0136] The recess 312 is a portion where the engaging portion 330 (ball 333) described later is engaged. The recess 312 is formed so that the right surface of the support portion 310 is recessed. The recess 312 is formed in a shape corresponding to the ball 333 described later. A plurality of recesses 312 are formed along an arc (an arc concentric with the insertion hole 311) centered on the axis of the lever rotation axis 25 in a side view according to the shift position of the main shift lever 20.

[0137] The engaging portion 330 engages with the recess 312 of the support portion 310. The engaging portion 330 is provided to the right of the support portion 310. The engaging portion 330 includes a cylindrical body 331, a fixing portion 332, a ball 333, a spring 334, a moving body 335, a support plate 336, and a roller 337.

[0138] The cylindrical body 331 is a member formed in a cylindrical shape. The cylindrical body 331 is arranged with the axis of the cylindrical body 331 oriented in the left-right direction.

[0139] The fixing portion 332 fixes the cylindrical body 331 to the lever main body portion 24 of the main shift lever 20. The fixing portion 332 is formed in a substantially L shape in a front view and is provided so that the lower end bends substantially to the left. The lower end of the fixing portion 332 is fixed to the lever main body portion 24. The left portion of the cylindrical body 331 is fitted to the middle portion in the vertical direction of the fixing portion 332.

[0140] The ball 333 shown in FIG. 13(b) is a member formed in a spherical shape. The ball 333 is provided inside the cylindrical body 331.

[0141] The spring 334 shown in Fig. 13(b) biases the ball 333 toward the support portion 310. The spring 334 is, for example, a compression coil spring. The spring 334 is disposed inside the cylindrical body 331 with its expansion and contraction direction oriented in the axial direction of the cylindrical body 331. The spring 334 is disposed to the right of the ball 333.

[0142] The moving body 335 shown in Fig. 13(b) is movable inside the cylindrical body 331. The moving body 335 is formed in a substantially cylindrical shape and is disposed inside the cylindrical body 331 with its axis oriented in the axial direction of the cylindrical body 331. The moving body 335 is disposed to the right of the spring 334.

[0143] The support plate 336 supports the roller 337 described later. The support plates 336 are provided at the front and rear portions of the cylindrical body 331 respectively with their plate surfaces oriented substantially in the front-rear direction. The support plate 336 is provided so as to protrude rightward from the right end of the cylindrical body 331.

[0144] The roller 337 is rotatable. The roller 337 is disposed to the right of the moving body 335 with its axis oriented substantially in the front-rear direction. The roller 337 is provided at a position where it contacts the moving body 335. The roller 337 is provided so as to be rotatable about the rotation axis 337a.

[0145] The rotation axis 337a is rotatably supported by the front and rear support plates 336 with its axis oriented substantially in the front-rear direction. The rotation axis 337a is provided at a position eccentric from the axis of the roller 337. Specifically, the rotation axis 337a is provided such that its axis is located to the right of the axis of the roller 337.

[0146] The switching operation tool 340 is for performing an operation to switch the state of the switching mechanism 300. The switching operation tool 340 is formed in a substantially rectangular plate shape and is provided with its plate surface oriented in the left-right direction. The switching operation tool 340 is fixed to the front end of the rotation axis 337a of the roller 337.

[0147] In the switching mechanism 300 configured as described above, by operating the switching operation tool 340, the roller 337 can be rotated. Since the rotation axis 337a of the roller 337 is eccentric, by rotating the roller 337 around the rotation axis 337a, the moving body 335 is displaced in the left - right direction. When the moving body 335 is displaced in the left - right direction, the force by which the ball 333 is pressed against the recess 312 also changes. Specifically, by displacing the moving body 335 to the left against the biasing force of the spring 334, the force by which the ball 333 is pressed against the recess 312 becomes relatively strong. On the other hand, by displacing the moving body 335 to the right by the biasing force of the spring 334, the force by which the ball 333 is pressed against the recess 312 becomes relatively weak.

[0148] By operating the switching operation tool 340 to displace the moving body 335 to the left, the main transmission lever 20 can be switched to the stepped - shift operation state. Specifically, when the moving body 335 is displaced to the left, the force by which the ball 333 is pressed to the left becomes relatively strong, so the ball 333 fits into the nearby recess 312. As a result, the main transmission lever 20 can be stopped only at positions corresponding to a plurality of recesses 312, and it becomes a stepped - shift operation state.

[0149] On the other hand, by operating the switching operation tool 340 to displace the moving body 335 to the right, the main transmission lever 20 can be switched to the continuously - variable - speed operation state. Specifically, when the moving body 335 is displaced to the right, the force by which the ball 333 is pressed to the left becomes relatively weak. In this state, the force for stopping the main transmission lever 20 by the friction plate 123 (see FIG. 5) provided at the rotation fulcrum of the main transmission lever 20 is stronger than the force by which the ball 333 tries to fit into the recess 312. As a result, the main transmission lever 20 can be stopped at an arbitrary position regardless of the position of the recess 312, and it becomes a continuously - variable - speed operation state.

[0150] In this way, by operating the switching operation tool 340, the stepped - shift operation state and the continuously - variable - speed operation state can be switched.

[0151] As described above, in the tractor 1B according to the third embodiment, the switching operation tool 340 and the main speed change lever 20 (speed change operation tool) are constituted by different members.

[0152] With such a configuration, the stepped speed change operation state and the continuously variable speed operation state can be switched by a member different from the main speed change lever 20 (speed change operation tool).

[0153] The embodiments of the present invention have been described above. However, 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.

[0154] For example, although the work vehicle according to each embodiment is the tractor 1, the type of the work vehicle according to the present invention is not limited thereto. The work vehicle according to the present invention may be other agricultural vehicles, construction vehicles, industrial vehicles, etc.

[0155] Also, in the first and second embodiments, when switching between the stepped speed change operation state and the continuously variable speed operation state by the main speed change lever 20, an operation of rotating the gripping portion 21 is performed. However, the switching operation may be performed by other methods. For example, an arbitrary operation tool (button, switch, lever, etc.) may be provided on the main speed change lever 20, and the stepped speed change operation state and the continuously variable speed operation state may be switched so as to be interlocked with the operation tool.

[0156] Also, in the first and second embodiments, the main speed change lever 20 and the engaging portion 130 are interlockingly connected by the wire mechanism 140 and the link mechanism 240, respectively. However, the mechanism for interlockingly connecting the main speed change lever 20 and the engaging portion 130 can have an arbitrary structure. For example, the rotation of the main speed change lever 20 (gripping portion 21) may be detected by a sensor, and the engaging portion 130 may be interlocked by electrically controlling an actuator.

[0157] Also, in the third embodiment, an operation is performed to switch between the stepped shift operation state and the continuously variable shift operation state by the switching operation tool 340. However, a mechanism for switching between the stepped shift operation state and the continuously variable shift operation state by the main shift lever 20 as in the first and second embodiments may also be provided. That is, it may be configured such that the stepped shift operation state and the continuously variable shift operation state can be switched by both the main shift lever 20 and the switching operation tool 340.

[0158] Also, the shape of each member is an example, and it can be any shape as long as the object can be achieved.

Explanation of Reference Numerals

[0159] 1, 1A, 1B Tractor 20 Main shift lever 100, 200, 300 Switching mechanism 110 Support portion 112 Groove portion 120 Supported portion 123 Friction plate 130, 230, 330 Engaging portion 140 Wire mechanism 150 Biasing portion 240 Link mechanism 340 Switching operation portion

Claims

1. A shift operation tool capable of shift operation, A stepped shift operation state in which the shift operation tool can be shifted step by step, and a stepless shift operation state in which the shift operation tool can be shifted steplessly, and a switching mechanism capable of switching between them, A switching operation tool capable of operating to switch the state of the switching mechanism, Comprising, The switching mechanism, An engaged portion provided on the vehicle body and having a plurality of recesses formed according to the shift position of the shift operation tool, An engaging portion provided so as to be relatively movable with respect to the shift operation tool, Comprising, The switching operation tool, The engaging portion can be switched between a position where it can be engaged with the recess and a position where it cannot be engaged with the recess, The switching mechanism, A work vehicle comprising a link mechanism that interlocks and connects the switching operation tool and the engaging portion. Work vehicle.

2. A shift operation tool capable of shift operation, A stepped shift operation state in which the shift operation tool can be shifted step by step, and a stepless shift operation state in which the shift operation tool can be shifted steplessly, and a switching mechanism capable of switching between them, A switching operation tool capable of operating to switch the state of the switching mechanism, Comprising, The switching mechanism, An engaged portion provided on the vehicle body and having a plurality of recesses formed according to the shift position of the shift operation tool, An engaging portion provided so as to be relatively movable with respect to the shift operation tool, Comprising, The switching operation tool, The engaging portion can be switched between a position where it can be engaged with the recess and a position where it cannot be engaged with the recess, The switching mechanism, A work vehicle comprising a wire mechanism that interlocks and connects the switching operation tool and the engaging portion using a wire. Work vehicle.

3. The switching mechanism, Comprising a biasing portion that constantly biases the engaging portion toward the engaged portion, The work vehicle according to Claim 1 or Claim 2.

4. The switching mechanism, A first contact portion provided on the vehicle body, A second contact portion provided on the shift operation tool and capable of restricting the operation of the shift operation tool at an arbitrary shift position by the frictional force between the first contact portion and the second contact portion, Comprising, The work vehicle according to Claim 1 or Claim 2.

5. The engaged portion and the first contact portion are constituted by a common member. The work vehicle according to Claim 4.

6. The switching operation tool and the shift operation tool are constituted by a common member. The work vehicle according to Claim 1 or Claim 2.

7. The switching operation tool, Is constituted by a gripping portion of the shift operation tool, and by rotating the gripping portion, the stepped shift operation state and the stepless shift operation state are switched. The work vehicle according to claim 6.

8. The switching operation tool and the shift operation tool are composed of different members. The work vehicle according to claim 1 or claim 2.

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