JPH0739725Y2 - Transmission structure for traveling of work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is provided with a pair of steering clutch mechanisms for separately transmitting the rotational output of a traveling mission to the left and right traveling devices. The present invention relates to a traveling power transmission structure for a work vehicle provided with a steering operation tool for operating a machine body by operating a mechanism.

[Prior Art] In the above-mentioned work vehicle, as shown in, for example, Japanese Patent Laid-Open No. 62-165048, a drive rotation in which a forward / reverse switching device switches a rotation direction between a forward power transmission direction and a reverse power transmission direction. A body is provided, and the rotational power of the drive rotating body is transmitted to one of the left and right traveling devices by one of the pair of steering clutch mechanisms and to the other traveling device by the other steering clutch mechanism. The forward / reverse switching is performed by the rotation direction switching operation of the drive rotor by the switching operation of the forward / backward switching device, and the vehicle body steering operation is performed by the driving / stopping operation of the traveling device by the operation of the steering clutch mechanism. It was

[Problems to be solved by the device]

Conventionally, when working while reciprocating the aircraft or turning the aircraft at the end of the field, it was necessary to repeat the operation of switching the operation lever of the forward / reverse switching device from one of the forward position and the reverse position to the other. The operation labor required for switching between forward and backward movements is relatively large, and the vehicle can only make a turn with one of the left and right traveling devices stopped, so that the turning radius is relatively large.

The object of the present invention is to modify the vehicle so that the forward and backward movements can be relatively easily operated and a small turn can be made.

[Means for Solving the Problems]

In order to achieve the purpose, a traveling structure for traveling of a work vehicle according to the present invention, a first driving rotary body for forward power transmission, and a second driving rotary body for reverse power transmission are provided so as to be always drivable. A first steering clutch mechanism for selectively transmitting the turning power of the driving rotary body and the turning power of the second driving rotary body to one of the left and right traveling devices, and the turning power of the first driving rotary body and the A second steering clutch mechanism that selectively transmits the turning force of the second drive rotating body to the other of the left and right traveling devices is provided, and the first steering clutch mechanism and the second steering clutch mechanism are operated. A steering operation tool is operably provided, and both of the first steering clutch mechanism and the second steering clutch mechanism are rotated by the second drive rotating body in preference to the operation by the steering operation tool. The reverse position operated to the side for transmitting power and the first steering clutch And a maneuvering reverse operating tool that can be switched between a non-acting position allowing the operation of the steering mechanism and the second manipulating clutch mechanism by the steering manipulating tool, and urging the manipulating backward manipulating instrument to the non-acting position. The features and effects are as follows.

[Action]

When both the first and second steering clutch mechanisms are operated by operating the steering operation tool to a state in which the rotational force of the first drive rotor is transmitted, both of the left and right traveling devices are driven forward. State in which the vehicle body moves straight forward and one of the first and second steering clutch mechanisms transmits the rotational force of the first drive rotor and the other transmits the rotational force of the second drive rotor. When operated by, one of the left and right traveling devices is driven to the forward side and the other is driven to the reverse side, so that the machine body turns in a solid turn in which the turning center is located between the left and right traveling devices.

When the maneuvering reverse manipulator is operated to the reverse position while the steering manipulating device is positioned at the straight forward position or the turning position, both the first and second steering clutch mechanisms are caused due to the preferential action of the reverse manipulating device. Becomes a state in which the rotational force of the second drive rotating body is transmitted, and both of the left and right traveling devices are driven to the reverse side so that the machine body goes straight backward, and in this state, when the operation on the artificial backward operating tool is released, The reverse operation tool is automatically restored to the non-actuated position by the urging force, and the first and second steering clutch mechanisms are brought into the operation state by the steering operation tool, so that the machine body advances straight ahead or turns.

[Effect of device]

By switching the forward / backward movement of the machine body, it is easier to operate than before by simply switching the artificial reverse operation tool to the reverse position or canceling this switching operation, and the left / right traveling device is driven in the reverse rotation direction to turn the machine body. It was possible to make work easier and more efficient from both the operating and turning surfaces.

〔Example〕

 Next, examples will be shown.

As shown in FIG. 4, a hydraulic continuously variable transmission (M ₁ ) capable of switching the engine output between the forward drive side and the reverse drive side across neutral.
And a transmission auxiliary gear shift which is transmitted to the transmission case (2) via the input shaft (1), and the rotational power of the input shaft (1) can be switched to three stages by sliding operation of the shift gear member (3). device while transmitting to (M _2), the auxiliary converter (M ₂₎ the left and right crawler type traveling device through a rotational output machine exercises countercurrent apparatus (a) of (4), (4) respectively of the crawler drive shaft The drive transmission structure for the combine is configured by transmitting the power to (5).

As shown in FIG. 4 and FIG. 5, the forward steering gear (7) is mounted on the mission case (2) so as to be supported via the support shaft (6) to constitute the airframe steering device (A). ),
By directly engaging the output shaft gear (8) of the traveling auxiliary transmission (M ₂ ) with the output shaft gear (8), the auxiliary shaft (6) is always driven to rotate about the axis (P) of the support shaft (6). Support shaft (6)
A reverse transmission gear (9a) or (9b) arranged so as to rotate around the shaft center (P) on each of both ends of the traveling auxiliary transmission (M ₂ ) through a reverse transmission transmission gear mechanism (10). ) The output shaft gear (11a) or (11b) is driven so as to always rotate in the opposite rotation direction to the forward transmission gear (7) about the same axis as the forward transmission gear (7). The first steering clutch mechanism (CL ₁ ) and the gear transmission mechanism (18) are selectively arranged between the rotation power of the forward transmission gear (7) and the rotation power of one reverse transmission gear (9a). Is transmitted to the crawler drive shaft (5) of one of the traveling devices (4) to selectively rotate the forward drive gear (7) and the reverse drive gear (9b) in the second steering direction. A clutch mechanism (CL ₂ ) and a gear transmission mechanism (18) are used for transmission to the crawler drive shaft (5) of the other traveling device (4). Then, the first lever-type steering operation tool (22) shown in FIG.
The second steering clutch mechanism (CL ₁ ) and (CL ₂ ) are operated to drive and stop the left and right traveling devices (4) and (4).

That is, each of the first steering clutch mechanism (CL ₁ ) and the second steering clutch mechanism (CL ₂ ) includes the support shaft (6).
Sliding operation of the gear transmission member (12) attached to the gear transmission mechanism (18) such that the gear transmission member (12) can slide relative to the gear (18a) while maintaining the engagement with the gear (18a) by the swinging fork (20). Then, when the clutch gear portion (13) provided on one end side of the transmission member (12) meshes with the clutch gear portion provided on the boss portion of the forward transmission gear (7), the transmission member (12)
Rotates in conjunction with the forward transmission gear (7) and transmits power to the gear (18a), so that the forward transmission state is achieved so that the turning force of the forward transmission gear (7) is transmitted to one traveling device (4). Is done. Then, the friction plate mounting portion (15) provided on the other end side of the transmission member (12) and the reverse transmission gear (9
A multi-plate friction clutch body (1) provided between a) or (9b) and a clutch housing (14) formed as an integral part.
When 6) comes in due to the pressing operation of the clutch operating part (17) of the transmission member (12), the transmission member (12) rotates together with the reverse transmission gear (9a) or (9b) and the gear (18a).
By transmitting power to the reverse drive gear (9a) or (9b), the reverse drive state is set so that the rotational power of the reverse drive gear (9a) or (9b) is transmitted to one of the traveling devices (4). Further, when the transmission member (12) is disengaged from the forward transmission gear (7) and is in the neutral position where it does not press against the clutch body (16), the transmission member (12) is moved forward (forward) and backward (downward) transmission gear (7). By rotating relative to either 9a) or (9b), the forward transmission gear (7) and the reverse transmission gear (9a) or (9b) do not transmit any rotational power so that the transmission is cut off. It is designed to be.

The first and second steering clutch mechanisms (CL ₁ ) and (CL ₂ ) can be operated by the steering operation tool (22).
And the second steering clutch mechanisms (CL ₁ ) and (CL ₂ ) are slidably urged by the forward urging spring (19) to a position where they are engaged with the forward transmission gear (7), and a pair of As shown in FIG. 2, a hydraulic cylinder that interlocks with a swinging fork (20) for slidingly operating the transmission members (12) and (12) of the above, via a fork support shaft (21) and a swinging arm (26). (C) is attached to the outside of the mission case (2), and one electromagnetic control valve (CV) for operating the pair of hydraulic cylinders (C), (C) based on the hydraulic circuit shown in FIG. As shown in FIG. 3, the variable relief valve (RV) has a pair of control operation switches (25a), (25b) and switch operation tools (23a), (23).
It is linked to the steering operation tool (22) so that it can be operated via b) or the interlocking operation wire (27) and the pair of swing links (29a) and (29b). That is, when the steering operation tool (22) is swung in the lateral direction of the machine body around the pivot axis (X) and operated to the straight traveling position (S), the switch operation tool (23a) or (23b) is operated. The switch (25a) and the switch (25b) are switched off and the control valve (CV) is switched off because the switch (25a) and (25b) are switched to the non-contact state with the operation tool (22) and pulled by the spring (24). The neutral position. For this reason, the hydraulic cylinders (C) and (C) are shortened by their self-shortening force to be in the non-acting position apart from the swing arm (26).
Any of the output members (12), (12) is moved forward by the forward biasing spring (19) so that the forward drive transmission gear (7) is moved.
To occlude. When the steering operation tool (22) is operated from the straight travel position (S) to the first turning position (L ₁ ) or (R ₁ ) on the left or right side of the aircraft, the switch operation tool (23
a) or (23b) enters and is switched to the operation position for the pressing operation by the steering operation tool (22), and the operation switch (25a)
Or (25b) is switched to ON and the control valve (CV) is switched to the swing position. Due to this valve switching, one hydraulic cylinder (C) expands and pushes the swing arm (26), and one output member (12) moves the forward transmission gear for the fork operation by this arm operation. It leaves from (7). At this time, since the relief pressure of the variable relief valve (RV) is low and the operating pressure of the hydraulic cylinder (C) is low, the clutch body (16) is still in the disengaged state. Then, the steering operation tool (22) is further swung from the first turning position (L ₁ ) or (R ₁ ) to the left side or the right side of the aircraft.
When operated to the turning position (L ₂ ) or (R ₂ ), the variable relief valve (R
The relief pressure of V) is automatically increased to the set maximum relief pressure, so that the hydraulic pressure supplied to the hydraulic cylinder (C) becomes the set maximum hydraulic pressure, and the hydraulic cylinder (C) passes through the output member (12). The operating pressure acting on the clutch body (16) reaches the set maximum operating pressure, and the clutch body (16) is engaged. When the steering operation tool (22) is operated between the first turning position (L ₁ ) or (R ₁ ) and the second turning position (L ₂ ) or (R ₂ ), the relief pressure of the variable relief valve (RV) is increased. When the relief pressure is lower than the set maximum relief pressure, the hydraulic pressure of the hydraulic cylinder (C) becomes smaller than the set maximum hydraulic pressure, and the clutch operating pressure by the hydraulic cylinder (C) is lower than the set maximum operating pressure. Then, the clutch body (16) is in a half-clutch state.

The pair of swing links (29a) and (29b) are connected to the steering operation tool (22) by the operation tool pivot member (28) so that the steering operation tool (22) and the variable relief valve (RV) can be interlocked. ), The operation wire (27) interlocks the pair of rocking links (29a) and (29b) with the rocking operation part (33) of the variable relief valve (RV). At the same time, the outer wire and the inner wire of the operation wire (27) are separately connected to the pair of swing links (29a) and (29b), respectively.
When 2) reaches the straight-ahead position (S), the pair of rocking links (29a), (2
9b) are connected by a spring (31). And
As the steering operation tool (22) is swung from the forward position (S), the operation pin (30) attached to the steering operation tool (22) presses one of the swing links (29a) or (29b). The stopper pin (32) attached to the operation tool pivot member (28) is structured so as not to swing the other swing link (29b) or (29a) while swinging this link. The steering operation tool (22) is configured so as to be stopped and supported.
One swing link (29a) or (29b)
Operates the inner wire or the outer wire to operate the operation tool to operate the rocking operation part (33) to the relief pressure increasing side, and the biasing force of the spring (31) causes the rocking operation part (33) to operate. Is operated to reduce the relief pressure.

In short, when the steering operation tool (22) is operated to the straight traveling position (S), the first and second steering clutch mechanisms (CL ₁ ) and (CL ₂ )
Both of them are in the forward transmission state, and the left and right traveling devices (4), (4) are driven to the forward side so that the machine body advances straight ahead. When the steering operation tool (22) is operated to the first turning position (L ₁ ) or (R ₁ ), one steering clutch mechanism (CL ₁ ) or (CL ₂ ) is in the transmission disengaged state and the other operation is performed. While the directional clutch mechanism (CL ₂ ) or (CL ₁ ) is in the forward transmission state and one of the traveling devices (4) is in the idle state so that the aircraft turns around one traveling device around the turning center, The traveling device (4) is driven forward. When the steering operation tool (22) is operated to the second turning device (L ₂ ) or (R ₂ ), one steering clutch mechanism (CL ₁ ) or (CL ₂ )
In the reverse transmission state, the other steering clutch mechanism (CL ₂ ) or (CL ₁ ) is in the forward transmission state so that the aircraft turns around the turning center between the left and right traveling devices (4) and (4). One of the traveling devices (4) is driven on the reverse side and the other traveling device (4) is driven on the forward side.

As shown in FIG. 1, the pair of swing arms (26),
A reverse pedal (35) is interlocked with (26) through an interlocking operation wire (34). Then, connect the outer wire of the operation wire (34) to the operation portion (26
a) and connect the inner wire to the other swing arm (2
The hydraulic cylinders (C) and (C) are connected to the operation portion (26a) of 6), and each of the hydraulic cylinders (C) and (C) has a swing arm (26).
The hydraulic cylinder (C) acts on the rocking arm (26) by the control valve (CV).
Since the swinging arm (26) can be operated by the operation wire (34) even when it is operated in the non-acting position with respect to the reverse pedal (35), it is in the non-acting position (OFF) where the reverse pedal (35) is not depressed. At times, the first and second steering operation tools (22) are used to push the swinging arm (26) backward while bending any of the hydraulic cylinders (C), (C) or the operation wire (34). 2 steering clutch mechanism (C
If the reverse pedal (35) is depressed to the reverse position (R) so that L ₁ ) and (CL ₂ ) can be operated,
First and second operation is performed by operating each swing arm (26), (26) to the reverse side in preference to the operation by the steering operation tool (22).
Both steering clutch mechanisms (CL ₁ ) and (CL ₂ ) can be operated in reverse transmission. The reverse pedal (35) is connected to the first and second steering clutch mechanisms (C
The steering operation tool (22) is biased to the non-acting position (OFF) by the forward biasing springs (19) of L ₁ ) and (CL ₂ ) respectively, so that the steering operation tool (22) is moved to the straight traveling position (S) or the turning position (L). ₁ ), (L ₂ ),
(R ₁ ), (Keep it in the position of R ₂ and move backward pedal (35)
When the pedal is operated, the aircraft will go straight backward, and if the pedal operation is released, the reverse pedal (35) will be in the inactive position (OFF).
It is configured to automatically restore to the vehicle body and to perform straight forward movement or turning traveling determined by the operating position of the steering operation tool (22).

[Another embodiment]

FIG. 6 shows another implementation operation structure that enables reverse operation,
A hydraulic cylinder (36) is mounted between the operating portion (26a) of one swing link (26) and the operating portion (26a) of the other swing link (26), and this hydraulic cylinder (36) is an electromagnetic control valve. By switching operation of (37), oil is supplied and extension operation is performed, and since the hydraulic cylinder (C) is abutting type with respect to the swing arm (26), it can be operated by the steering operation tool (22). Pivoting arm (2
6) etc. via the first and second steering clutch mechanism (CL ₁ ),
(CL ₂ ) can be operated by switching to the reverse transmission state,
Due to the urging force of the forward urging spring (19) and the operating force of the hydraulic cylinder (C), the drainage can be shortened freely, and the first and second steering clutch mechanisms ( It is configured to allow the operations of CL ₁ ) and (CL ₂ ). Then, the operation switch (3
8) Attach a reverse operation tool (40) linked to this operation switch (38) via an interlocking rod (39) to a speed change lever (41) for operating the continuously variable transmission (M ₁ ). At the same time, the control valve (37) is operated by a switch operation by the reverse operation tool (40).

That is, when the reverse operation tool (40) is pulled up to the reverse position (R) where the set stroke is raised with respect to the speed change lever (41), the operation switch (38) is switched on and the electromagnetic control valve (37) is refueled. Position, and the hydraulic cylinder (3
6) is extended. Then, the reverse operation tool (4
When the lifting operation for (0) is released, the speed change lever (4
The reverse operation tool (40) descends with respect to the speed change lever (41) due to the urging force of the spring (42) that is installed inside 1) and that acts on the interlocking rod (39), and the reverse position (OF
Automatically returns to F), the electromagnetic control valve (37) switches to the oil drain operation position, and the hydraulic cylinder (36) turns into the hydraulic cylinder (C).
The external force allows it to expand and contract freely so as not to hinder the operation of the clutch mechanism.

The reverse transmission gear is one of (9a) or (9b) and is located in the middle part of the support shaft (6), and the two forward transmission gears (7) are both ends of the support shaft (6). You may carry out by disperse | distribute and arrange | position to the side. In addition, the forward transmission gear (7) and the reverse transmission gear (9
A) or (9b) may be replaced by a chain sprocket, and the forward transmission gear (7) is referred to as the first drive rotating body (7), and the reverse transmission gears (9a) and (9b) are referred to as the first Two
They are referred to as drive rotating bodies (9a) and (9b).

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 shows an embodiment of a power transmission structure for traveling of a work vehicle according to the present invention. FIG. 1 is a reverse operation system diagram, FIG. 2 is a hydraulic circuit diagram, and FIG. 3 is one of steering operation tool disposition parts. FIG. 4 is a cross-sectional view of a traveling transmission structure, FIG. 5 is a cross-sectional view of a reverse transmission portion, and FIG. (4) …… Traveling device, (7) …… First drive rotating body, (9
a), (9b) …… Second drive rotating body, (22) …… Steering operation tool, (35), (40) …… Reverse operation tool, (R) …… Reverse position, (OFF) …… Non-operating position, (CL ₁ ) ... 1st steering clutch mechanism, (CL ₂ ) ... 2nd steering clutch mechanism.

Claims (1)

[Scope of utility model registration request] 1. A first drive rotor (7) for forward power transmission,
And second drive rotating bodies (9a), (9b) for reverse power transmission
Is provided so that it can be driven at all times, and one of the left and right traveling devices (4) and (4) is selectively used for the turning power of the first driving rotor (7) and the turning power of the second driving rotor (9a). Steering mechanism (CL ₁ ), which is transmitted to the left / right traveling device, and the turning power of the first driving rotary body (7) and the turning power of the second driving rotary body (9b) are selectively transmitted to the left and right traveling devices. A second steering clutch mechanism (CL ₂ ) for transmitting to the other of (4) and (4) is provided, and the first steering clutch mechanism (CL ₁ ) and the second steering clutch mechanism (CL ₂ ) are provided. A steering operation tool (22) to be operated is provided so as to be freely operable, and both the first steering clutch mechanism (CL ₁ ) and the second steering clutch mechanism (CL ₂ ) are operated by the steering operation tool ( 22) and the reverse drive position (R) operated to the side transmitting the rotational force of the second drive rotors (9a), (9b) in preference to the operation by Mechanism (CL ₁₎ and the second steering clutch mechanism (CL ₂₎ the steering operation member (2
In addition to providing artificial reverse operation tools (35), (40) that can be switched to the non-acting position (OFF) that allows operation by 2),
A transmission structure for traveling of a work vehicle in which the artificial reverse operation tools (35), (40) are biased to the non-acting position (OFF).