JP3445230B2 - Agricultural work vehicle - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention includes a steering operation mechanism, a traveling clutch operation mechanism, and a side brake operation mechanism that can be operated in a boarding state, and travels on a sloping ground with a narrow road width such as in a mountainous area or over a ridge. The present invention relates to an agricultural work vehicle that is provided with an auxiliary traveling operation mechanism that is easy to operate when it is necessary and that is capable of traveling operation when the vehicle is alighting.

[0002]

2. Description of the Related Art There is a traveling machine constructed as described above in Japanese Utility Model Laid-Open No. 52-76032, and in this conventional example, a tie rod of a steering mechanism is used to perform a steering operation in a getting-off state. A removable operating frame is provided for the driver so that the driver can hold the operating frame and operate it at a position that is centered to the left and right of the vehicle and is not far from the front end of the vehicle. It was arranged.

[0003]

Since the operating frame is arranged at the center of the traveling machine body in the left-right direction, as shown in FIG. 3 of the publication, when the driver grasps the operating frame, Since it will be located almost in front of you, you can only see the hood of the vehicle. However, when the traveling vehicle is mounted on the bed of a carrier using a foot plate, it is better to steer while watching the traveling state of the rear wheels, but as described above, At a position where only the bonnet can be seen, the running state of the rear part of the vehicle such as the state of the rear wheels could not be fully grasped, and there was a difficulty in maneuverability. On the other hand,
As shown in FIG. 1, by arranging an auxiliary traveling operation mechanism such as the auxiliary clutch lever 41 and the auxiliary brake lever 42 for traveling operation in a getting-off state on the lateral side of the traveling machine body, the trend of the rear wheels is also grasped. However, in this case, the driver's control position is limited to the lateral side of the traveling machine body, so it is difficult to move when driving on narrow ridges. Not only is the maneuvering cramped, but the road is practically too narrow to drive. The object of the present invention is to use not only the front wheels on the left and right but also the rear wheels while operating the vehicle in a rearward direction toward the traveling vehicle, if necessary, while using a relatively large space on the front side of the traveling vehicle. The point is to provide an agricultural work vehicle that can be operated while grasping

[0004]

[Structure] A characteristic structure of the invention according to claim 1 is that a steering operation mechanism, a traveling clutch operation mechanism, and a brake operation mechanism that can be operated in a riding state are provided, and the steering operation mechanism is At least one of the traveling clutch operation mechanism and the brake operation mechanism is provided with an auxiliary traveling operation mechanism that can be operated in the dismounting state,
An operation frame equipped with the auxiliary traveling operation mechanism extends forward from a front end portion of the traveling machine body, and an artificial operation section in the operation frame is located at a position separated from the front end portion of the traveling machine body forward. It is located eccentrically on one side in the left-right lateral direction of the traveling machine body, and its action and effect are as follows. [Action] When maneuvering operation in a getting-off state Since the operation part is located in front of the traveling body, it is possible to perform the steering operation in a relatively wide space part, and it is possible to view the entire traveling body from a distant position. It is also possible to visually check. Moreover, since the artificial operation section is eccentric to the left or right, the traveling machine body can be seen from the front diagonally, and one rear wheel portion can be visually checked together with the left and right front wheels.
If necessary, you can turn backwards and watch carefully for wheel movements and drive carefully. Also, even when traveling on a narrow road close to the width of the traveling body, the artificial operating part is set in a state of being eccentric to the front of the traveling body and to the left or right, so Moreover, since a large space is secured on the front side of the traveling machine body, a sufficient steering space can be secured. [Advantages of the Invention] As described above, by adopting a configuration in which the human operation unit is provided at a position spaced apart in front of the traveling machine body and is provided so as to be offset to the left and right one side, even in a getting-off state, and Even when traveling on a narrow road such as in a mountainous area, it is possible to perform a steering operation with sufficient intention for the traveling wheels, and a quick and reliable operation is possible.

[Structure] The characterizing feature of the invention according to claim 2 is the characterizing feature of the invention according to claim 1, wherein the steering operation mechanism and the operation frame are linked through a first linking mechanism, The steering operation mechanism is configured to be operated by changing the posture of the frame, and the operation and effect are as follows. [Operation and effect] In addition to the operation and effect on the invention according to claim 1, Since the steering operation mechanism can be operated only by changing the attitude of the operation frame, no special operation tools are required,
There is a merit that the operation frame itself, which is provided to equip the artificial operation section for performing other operations, can also be used as the operation tool.

[Structure] The characterizing feature of the invention according to claim 3 is the characterizing feature of the invention according to claim 1 or claim 2, wherein an artificial auxiliary clutch operating tool is provided on the operating frame as an auxiliary traveling operating mechanism. , The auxiliary clutch operating tool and the traveling clutch operating mechanism are linked through a second linking mechanism, and the action and effect are as follows. In addition to the effects of the invention of Item 2, the clutch can be operated, and the traveling operability can be improved.

[Structure] The characterizing feature of the invention according to claim 4 is the characterizing feature of the invention according to any one of claims 1 to 3, wherein the manipulating frame artificially functions as an auxiliary traveling manipulating mechanism. An auxiliary brake operating tool is provided, and the auxiliary brake operating tool and the brake operating mechanism are linked through a third linking mechanism, and the action and effect are as follows. In addition to the effect of the invention according to any one of claims 1 to 3, a brake operation can be performed while the vehicle is getting off. Therefore, when used in combination with steering operation or the like, traveling operability can be improved. Can be improved.

[Structure] The characterizing feature of the invention according to claim 5 is the characterizing feature of the invention according to any one of claims 1 to 4, wherein the operating frame is provided with respect to the machine body frame of the traveling machine body. It is configured to be detachable, and its operation and effect are as follows. [Operation and effect] In addition to the operation and effect for the invention according to any one of claims 1 to 4, Since the operation frame can be detachably configured, the operation frame may be attached and used only when necessary, and the operation frame does not hinder the traveling operation in the riding state.

[Structure] The characterizing feature of the invention according to claim 6 is the characterizing feature of the invention according to claim 1, wherein the traveling clutch operating mechanism or the brake operating mechanism is operated by moving the operating frame in the vertical direction. The operation and effects are as follows. [Operation and effect] In addition to the operation and effect on the invention according to claim 1, by vertically moving the operation frame, Since the traveling clutch mechanism or the brake mechanism can be operated, it is not necessary to provide a dedicated operation tool for operating the traveling clutch mechanism or the brake mechanism on the operation frame, and the operation frame can also be used as an operation tool. Therefore, the number of parts can be reduced.

[Structure] The characterizing feature of the invention according to claim 7 is the characterizing feature of the invention according to claim 1, wherein the brake operating mechanism is switched to the brake-on state by depressing the operation frame. The operation and effect are as follows. [Operation and effect] In addition to the operation and effect on the invention according to claim 1, the brake operation mechanism is turned on by pushing down the operation frame. Since it can be operated in the state,
It is not necessary to provide a dedicated operation tool for operating the brake operation mechanism on the operation frame, and the operation frame can also be used as an operation tool, and the number of parts can be reduced.

[Structure] The characterizing feature of the invention according to claim 8 is that in the characterizing feature of the invention according to claim 1, by changing the attitude of the operating frame in one direction, the traveling clutch operating mechanism is operated by the first stage operation. In addition to switching to the disengaged state, it is configured to switch from the clutch disengaged state to the brake engaged state by a series of operations, so as to switch to the brake engaged state with the brake operation mechanism by the second step operation, The action and effect are as follows. [Action effect] In addition to the action and effect for the invention according to claim 1, the clutch disengaged state can be switched to the brake engaged state by a series of operations on the operation frame. , It is possible to use both the clutch mechanism and the brake mechanism with the operation frame without the need for dedicated operation tools. Moni, can be performed only by switching on and off of the switching on and off of the clutches and brakes performed continuously a series of operations of the operating frame, it is possible to perform also a simple quick operation in operability.

[Structure] The characterizing feature of the invention according to claim 9 is the characterizing feature of the invention according to any one of claims 1 to 8, wherein a predetermined position is set from an operation start position with respect to the auxiliary traveling operation mechanism and the operation frame. Is located in a dead zone where the operating force is not transmitted to the other side, and its action and effect are as follows. [Effect] Any one of claims 1 to 8. In addition to the effect of the invention according to item 1, even if the operation of the auxiliary traveling operation mechanism or the like is started, the clutch mechanism or the like does not immediately respond, so the reaction is not too sensitive and the traveling operation is rather stable. .

[Structure] The characterizing feature of the invention according to claim 10 is the characterizing feature of the invention according to any one of claims 1, 5 to 9, wherein a lock mechanism for maintaining the brake operating mechanism in a braking state is provided. The operation frame is provided with a lock operation tool for the lock mechanism.
The operation and effect are as follows. [Operation and effect] In addition to the operation and effect on the invention according to any one of claims 1 to 5 to 9, by providing a brake lock mechanism, It is possible to stop, and it becomes possible to operate the operation mechanism that is operated in the riding state of the traveling machine away from the auxiliary traveling operation mechanism, and the operability is good.

[Structure] The characterizing feature of the invention according to claim 11 is the characterizing feature of the invention according to any one of claims 1 to 10, in which the operation frame is at the lower end operation limit of the operation frame. It is configured so as to contact the front end of the machine body frame in the direction of pushing it down, and its operation and effect are as follows. [Operation and effect] According to any one of claims 1 to 10. In addition to the effects of the invention, the operation frame is pressed against the front end of the traveling machine body even when the traveling machine body is in the forward rising state when the footboard is used to transfer to the carrier bed of the vehicle or over the ridge. Since it can be pushed down, it is possible to suppress the forward rising state of the traveling machine body and to secure a stable traveling state.

[Structure] The characterizing feature of the invention according to claim 12 is the characterizing feature of the invention according to any one of claims 1 to 11, in which a lock mechanism for stopping the operation of the steering operation mechanism is provided, and The lock release mechanism for releasing the locked state of the lock mechanism is provided, and the operation and effect are as follows. [Operation and effect] The invention according to any one of claims 1 to 11. In addition to the effect of the above, when the footboard is used to transfer to the bed of a carrier or when running over uneven ridges, the locking mechanism does not cause the steering to operate unexpectedly. It is possible to prevent the traveling body from moving in an unexpected direction. The lock mechanism can be effectively used because the lock can be released when the steering operation is required.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, an engine 4 is mounted on the front part of a traveling machine body 3 having front wheels 1 and rear wheels 2, and power from the engine 4 is passed through a main clutch 5A built in a main clutch housing 5. A transmission system for transmitting to a mission case 6 arranged at the rear of the traveling body is provided, a steering handle 7 is arranged at the center of the traveling body 3, and a driver's seat 8 is provided at an intermediate position between fenders of the left and right rear wheels 2.
Are arranged to configure an agricultural tractor as an agricultural work vehicle.

As shown in FIGS. 1 and 3, a side brake 9 for independently braking the left and right rear wheels 2 is provided on the side surface of the mission case 6, and on the right side of the step in front of the driver's seat 8. A pair of left and right brake pedals 10 for braking the left and right side brakes 9 by a depressing operation are arranged. The pair of left and right brake pedals 10 are connected by a connecting fitting 12 configured to be capable of changing the posture around a support shaft 11. It is configured to operate integrally. On the left side of the step, a main clutch pedal 13 that disengages the main clutch 5A by depressing is arranged. As described above, the side brakes 9, 9 and the side brake pedals 10, 10 and the linkage mechanism that links these together are collectively referred to as a brake operation mechanism. On the other hand, the main clutch pedal 13 and the main clutch 5A
And the linking mechanism that links them together are referred to as the main clutch operating mechanism.

The steering operation mechanism will be described.
As shown in FIG. 3, while mounting the pitman arm 14 on the lower end of the steering wheel shaft for the steering wheel 7,
Tie rods 15 and 15 are extended from the pitman arm 14, and the knuckle arm 1 is attached to the tips of the tie rods 15 and 15.
6, 16 are attached to the knuckle arms 16 and 16 so that they can rotate together with the front wheels 1 and 1. The steering wheel 7, the front wheel 1, and the pitman arm 14 that links them are collectively referred to as a steering operation mechanism. As described above, the steering operation mechanism, the main clutch operation mechanism, and the side brake operation mechanism are used when operating in the riding state seated on the driver's seat 8.

Next, when traveling on a ridge road in a mountainous area, or when elevating a footboard when mounting a tractor on a transport vehicle, an auxiliary traveling operation mechanism used when the driver drives in a getting-off state. Will be described. As shown in FIGS. 1 and 2, a channel-shaped bracket 17 is fixed near the right end of a bumper 3A provided at the front end of the traveling machine body 3 and can be swung left and right about the longitudinal axis X with respect to the bracket 17. A swing receiving frame 18 is attached to the. As shown in FIG. 4, a pair of left and right support brackets 19 and 19 are provided upright on the swing receiving frame 18, and the horizontal axis Y is sandwiched between the support brackets 19 and 19.
A swing holder 20 is pivotally supported so that it can swing up and down around it. A rod-shaped plug holder 20 is provided at the tip of the swing holder 20.
A is formed, and an operation frame 21 to be described later equipped with an auxiliary traveling operation mechanism is inserted and fixed to the holding portion 20A.

As shown in FIGS. 5 and 6, the operation frame 21 is formed of a substantially T-shaped pipe frame, and the front end frame portion 2 in the left-right direction is provided at the upper end position of the base end frame portion 21A.
1B is fixedly formed, and rubber grip portions 21C and 21C are attached to both ends of the tip frame portion 21B. The pipe-shaped lower end portion of the base end frame portion 21A is externally fitted to the insertion holding portion 20A of the swing holder 20 and is fixed with a stop pin. With such a configuration, the operation frame 21 can be vertically swingably operated around the horizontal axis Y. Although not shown, the operation frame 21 inserted and fixed in the insertion holding portion 20A does not need to be used during normal traveling, so it will be removed. However, after the removal, the base frame portion is removed. The front end face portion 21B is attached to the front end face of the bonnet with 21A facing upward so that it can be set to the retracted state. 5 and 6
As shown in FIG. 3, a plate frame 22 is erected on the rear side of the support brackets 19 and 19, and the outer wire end of a release wire type linkage mechanism 23 linked to the side brake operating mechanism is attached and fixed to the plate frame 22. . Board frame 22
The inner wire 23A protruding from the end of the outer wire attached to is fixedly connected to the swing holder 20. The linkage mechanism 23 is referred to as a second linkage mechanism. With the above configuration, when the operation frame 21 is pushed down,
The inner wire 23 is pulled and the side brakes 9 and 9 are set to the brake engaged state. The operation frame 21 and the side brakes 9, 9 are linked by a release wire type linkage mechanism 23 directly to the side brake pedal 1.
It may be linked to 0, 10 and side brake pedal 1
It may be connected to a linkage mechanism that links 0, 10 and the side brakes 9, 9.

The structure in which the brake can be switched to the on state by swinging the operating frame 21 downward about the horizontal axis Y has been described. Next, the operating frame 2
A configuration for steering operation by swinging 1 to the left and right will be described. As shown in FIGS. 3 and 5,
A passive arm 24 that swings integrally with the knuckle arm 16 is attached to the rotating shaft of the front right wheel 1, and a linking rod 25 is provided between the passive arm 24 and the swing receiving frame 18 that swings integrally with the operation frame 21. It is constructed so that the user can carry out a steering operation using the operating frame 21. That is, when the operation frame 21 is rotationally driven around the axis of the proximal end frame portion 21A, the swing receiving frame 18 rotates about the longitudinal axis X, and the knuckle arm 16 is rotationally driven via the linkage rod 25. Then, the front wheels 1, 1 are turned. Here, the swing receiving frame 18, the connecting rod 25, and the passive arm 24 are first
It is called a linkage mechanism.

Next, the auxiliary clutch operation tool 26 will be described. As shown in FIGS. 1 to 3, the auxiliary clutch operation tool 26 is provided with an oscillating arm 26A supported by a proximal end frame portion 21A of an operation frame 21 so as to be able to oscillate back and forth around a horizontal axis Z. The finger rest 2 is attached to the tip of the swingable arm 26A.
6B is attached to allow manual operation. In order to connect one end of the swingable arm 26A and the main clutch 5A, a release wire type linking mechanism 27 linked to the swingable arm 26A is provided to the main clutch pedal 13 and the main clutch 5.
The swingable arm 26A is connected to a linkage mechanism that links A and A.
It is possible to switch to the clutch disengaged state by laying the vehicle on the traveling body 3 side.

The brake lock operating tool 28 will be described. As shown in FIGS. 2 to 6, at the lower end portion of the base end frame portion 21A, the lock piece 29 is swingable about the lateral axis P.
In addition to pivotally supporting, the engaged piece 30 is erected from the swing receiving frame 18, and a serrated portion that engages with each other is formed at an engaging portion between the lock piece 29 and the engaged piece 30. A spring 31 that biases the lock piece 29 in a direction away from the engaged piece 30 is locked. To operate the lock piece 29, a grip lever 32 is provided on the distal end frame portion 21B, and a release wire type linkage mechanism 33 is provided between the grip lever 32 and the lock piece 29.
When the grip lever 32 is gripped, the lock piece 29 is rockably driven in a direction to engage with the engaged piece 30. Lock piece 29
When the engaged piece 30 is engaged with the engaged piece 30, the urging force acting on the lock piece 29 acts in a direction to maintain the engaged state, and the locked state is maintained even if the gripping operation on the grip lever 32 is released. It When the brake operation is performed by the structure as described above, the operation frame 21 is swung downward to switch the side brakes 9 and 9 to the on state, and when the grip lever 32 is gripped and operated, the lock piece 2 is released.
Even when 9 engages with the engaged piece 30 and the operation of the grip lever 32 is released, the engagement action of the urging spring 31, the lock piece 29, and the sawtooth engaging portion of the engaged piece 30 can be achieved. By cooperation,
The braked state is maintained. In this way, since the brake-engaged state is maintained without continuing the brake operation, it is possible to perform a shift operation by stopping on a slope or moving to the traveling machine body 3 side. As described above, the operation frame 21
The grip portion 21C and the grip lever 32 provided on the distal end frame portion 21B of the above, or the auxiliary clutch operating tool 26 and the like provided near the connection point between the proximal end frame portion 21A and the distal end frame portion 21B are artificially operated portions. And these are on the front side, which is separated from the front end of the traveling body 3 by a large distance. The left and right grips 21C provided on the distal end frame 21B of the operation frame 21, the finger hooks 26B of the auxiliary clutch operation tool 26, the grip lever 32, etc. are collectively referred to as an artificial operation section.

[First Alternative Embodiment] In the above embodiment, the auxiliary clutch operation tool 26 is provided on the base end frame portion 21A of the operation frame 21, and the grip lever 32 for brake lock is provided on the grip portion 21C of the operation frame 21. In the first alternative embodiment, as shown in FIG. 9, the grip lever 32 is configured as a clutch operating tool without providing the auxiliary clutch operating tool 26, and the grip lever 32 and You may employ | adopt the method of taking the structure linked with the clutch 5A. As for the brake operation, the operation frame 21 is rotated downward as in the above-described embodiment, and the brake is operated near the lower end position.

[Second Embodiment] As clearly shown in the above-described embodiment, the operation frame 21 is provided so as to be vertically swingable, and a grip-type brake lock operation tool is provided on the distal end frame portion 21A of the operation frame 21. 32 is provided and the auxiliary clutch operation tool 26 is not provided.
In the second alternative embodiment, no auxiliary steering operation mechanism for operating the steering by swinging the operation frame 21 is provided. On the other hand, the brake operation and the clutch operation have the following configurations. 7 and 8
As shown in, the bracket 17 is attached to the front of the bumper 3A.
Is attached, and the support brackets 19 and 19 are further erected from the bracket 17, and the support brackets 19 and 19 are
On the other hand, the operation frame 21 is attached so that it can swing only up and down around the horizontal axis Y. In order to operate the main clutch 5A and the side brakes 9 and 9 by vertically swinging the operation frame 21, the operation frame 21 is linked to the main clutch 5A and the side brakes 9 and 9 via a release wire mechanism 34. . The release wire mechanism 34 branches into a forked shape from the middle so as to link with the main clutch 5A and the side brakes 9, 9 and, as will be described later, the main clutch 5
A long hole-shaped interchange 34a is provided in the linkage mechanism linked to the side brakes 9 and 9 so that A is turned off and then the side brakes 9 and 9 are switched to the on state. Figure 8
As shown in FIG. 6, the lock swing arm 35 is pivotally supported rearward toward the steering mechanism at the swing axis Y position of the operation frame 21, and the lock swing arm 35 is engaged with the tie rod 15 of the steering mechanism. A possible lock engaging device 15A is provided. The lock swing arm 35 is provided with a spring 36 that urges the lock swing arm 35 in a direction to engage with the lock engagement tool 15A. The pressing rod 21a is extended from the base end frame portion 21A of the operation frame 21 with respect to the lock swing arm 35, and the pressing rod 21a is brought into contact with the lock swing arm 35 from above to operate the operation frame 2
When 1 is lifted up, the presser rod 21a swings the lock swing arm 35 downward so that the lock engagement tool 1
It can be detached from 5A. Therefore, in order to release the steering lock state, it is necessary to lift the operation frame 21 against the spring biasing force and maintain the state in which the lock swing arm 35 is separated from the lock engagement tool 15A. As shown in FIG. 7, the operation frame 21
Is rotated from the upper side to the lower side, the steering operation can be performed at the upper end of the operation range in the unlocked state, and when the first step operation is performed from the unlocked state, the lock swing arm 35 is locked. The steering operation is locked by engaging the tool 15A. In the first-step operation position, the main clutch is maintained in the engaged state. When the main clutch 5A is operated further downward from the first-step operating position and set to the second-step operating position, the main clutch 5A is disengaged. The steering lock state is maintained. When operated toward the third-step operating position below the second-step operating position, the main clutch 5
While A is in the disengaged state and the steering lock state is maintained, the side brakes 9, 9 are in the brake engaged state. Incidentally, reference numeral 32 in the drawing denotes a grip lever of the brake lock operating tool shown in the above-described embodiment, and when the grip lever 32 is operated by being gripped, the lock piece 29 engages with the engaged piece 30 to lock the brake state. To be done. As shown in FIG. 7, the bracket 17 provided at the tip of the bumper 3A is provided with a receiving pin 37 so that when the operation frame 21 is further pushed down from the third operation position, the downward surface of the operation frame 21 is received. It contacts the pin 36 and switches the entire traveling body to the forward leaning posture. That is, when traveling over a ridge or traveling in a mountainous area, the traveling machine body 3 may be in a rear center of gravity state and may be in a forward-raising posture, which makes it difficult to carry out traveling operation. The rising state is suppressed and a stable posture is maintained.

[Third Embodiment] The following configuration may be adopted as a brake operation mode. As shown in FIG. 10, both grip portions 21C, 21 of the operation frame 21
Grip levers 3 for operating the side clutch near C respectively
You may take the structure which provides 2,32. The left and right grip levers 32, 32 respectively include a release wire mechanism 38,
38 is linked to the left and right side brakes 9, 9. When one of the grip levers 32, 32 is operated, the corresponding side brake 9 is operated, one-side brake operation is performed, and a small turn is possible. On the other hand, the brake operating mechanism by the operation frame 21 is also maintained, and although not shown in the figure, as shown in the embodiment of FIG. 3, the swing holder 20 and the left and right side brakes 9, 9 are provided.
A release wire mechanism 23 is provided for linking the above, and when the operation frame 21 is pushed down to the lowermost position, both side brakes 9 and 9 are actuated and a traveling stopped state can be obtained.

An operation on an operation frame 21 which can be swung left and right to operate a steering operation mechanism and can be moved up and down to operate a clutch operation mechanism and a brake mechanism, or a clutch operation provided on the operation frame 21. When operating the grip lever 32 or the like with respect to the mechanism or the brake operating mechanism, a dead zone is provided at the initial operation stage to avoid excessive responsiveness.

In the above-described embodiment, the agricultural work vehicle equipped with the left and right side brakes 9 and 9 has been described. However, the brake operating mechanism is an operating mechanism for a single brake mechanism incorporated in the mission. Good.

Although not shown, the auxiliary clutch operation tool 26, the grip lever 32, and the operation frame 21 for operating the clutch brake are biased to the clutch disengagement side and the brake engagement side, respectively. You may take the structure which makes a spring act.

[Brief description of drawings]

1] Overall side view of an agricultural tractor

FIG. 2 is a plan view showing a mounting state of an operation frame.

FIG. 3 is a plan view showing the linkage between the operation frame and the steering mechanism.

FIG. 4 is a side view showing a mounting base end portion of the operation frame.

FIG. 5 is a vertical sectional side view showing a mounting base end portion of the operation frame.

6 is a plan view of FIG.

FIG. 7 is a side view showing another structure of the operation frame.

FIG. 8 is a plan view of FIG.

FIG. 9 is a plan view showing another structure in which the grip lever is configured to operate the main clutch operation mechanism.

FIG. 10 is a plan view showing another embodiment structure in which the left and right grip levers are configured to operate the left and right side brakes.

FIG. 11 is a plan view showing a comparative example in which auxiliary clutch levers and the like are attached to the side surface of the traveling body.

[Explanation of symbols]

3 traveling aircraft 7 Steering operation mechanism 10 Brake operation mechanism 13 Travel clutch operation mechanism 21 Operation frame 21C Human operation part 26 Auxiliary clutch operation tool 28 Auxiliary traveling operation mechanism 29 Brake lock mechanism 32 Auxiliary brake operation tool 35 Steering lock mechanism

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takuto Yasuhara 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Co., Ltd. Sakai Factory (72) Ken Uchiya, 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Corporation Inside the Sakai Works (56) References Actual Development 1-169475 (JP, U) Actual Development Sho 52-76032 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B62D 49/00 A01B 69/00 302

Claims (12)

(57) [Claims] 1. A steering operation mechanism, a traveling clutch operation mechanism, and a brake operation mechanism that can be operated in a boarding state, and at least one of the steering operation mechanism, the traveling clutch operation mechanism, and the brake operation mechanism is in an exiting state. An auxiliary traveling operation mechanism that can be operated with, and an operation frame equipped with the auxiliary traveling operation mechanism extends forward from the front end of the traveling machine body, and the human-operated portion of the operation frame is used as the traveling machine body. An agricultural work vehicle that is eccentrically provided at a position spaced apart from the front end of the vehicle and on one end side in the left-right lateral direction of the traveling machine body. 2. The agricultural product according to claim 1, wherein the steering operation mechanism and the operation frame are linked through a first linking mechanism, and the steering operation mechanism is operated by changing a posture of the operation frame. Work vehicle. 3. An artificial auxiliary clutch operating tool is provided as an auxiliary traveling operating mechanism on the operating frame, and the auxiliary clutch operating tool and the traveling clutch operating mechanism are linked via a second linking mechanism. The agricultural work vehicle according to 1 or 2. 4. The operation frame is provided with an artificial auxiliary brake operating tool as an auxiliary traveling operating mechanism, and the auxiliary brake operating tool and the brake operating mechanism are linked via a third linking mechanism. The agricultural work vehicle according to any one of 1 to 3. 5. The agricultural work vehicle according to claim 1, wherein the operation frame is configured to be detachable from the machine body frame of the traveling machine body. 6. The agricultural work vehicle according to claim 1, wherein the traveling clutch operating mechanism or the brake operating mechanism is operated by moving an operating frame in a vertical direction. 7. The agricultural work vehicle according to claim 1, wherein the brake operating mechanism is configured to be switched to a brake-on state by depressing the operation frame. 8. The posture of the operating frame is changed in one direction to switch the traveling clutch operating mechanism to the disengaged state by the first stage operation, and to bring the brake together with the brake operating mechanism by the second stage operation. The agricultural work vehicle according to claim 1, wherein the switching operation is switched from a clutch disengaged state to a brake engaged state by a series of operations. 9. The predetermined initial operation section from the operation start position with respect to the auxiliary traveling operation mechanism and the operation frame is set in a dead zone in which the operation force is not transmitted to the other side. The agricultural work vehicle according to item 1. 10. A lock mechanism for maintaining the brake operating mechanism in a brake state is provided, and a lock operating tool for the lock mechanism is provided on the operating frame.
10. The agricultural work vehicle according to any one of 9 to 10. 11. The agricultural machine according to any one of claims 1 to 10, wherein the operation frame is configured to come into contact with the front end portion of the machine body frame in a direction of pushing down at a lower end operation limit of the operation frame. Work vehicle. 12. A lock mechanism for stopping the operation of the steering operation mechanism, and a lock release mechanism for canceling the locked state of the lock mechanism.
The agricultural work vehicle according to any one of 1 to 11.