JP2001270460A - Turning operation structure of working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turning operation structure of a working vehicle allowing reduction of the number of part items and contraction of a mounting space. SOLUTION: This structure includes a direction setting valve 2 for setting a turning device into a rightward or leftward turning state, a pressure setting valve 3 for varying the actuation pressure of the turning device to vary the turning radius of a machine body, and a turning operation tool 1. The structure also includes an operating member 6 having a first operating part 7 for operating the direction setting valve 2 and a second operating part 8 for operating the pressure setting valve 3. When the turning operation tool 1 is operated rightward or leftward from a neutral position, the direction setting valve 2 is operated by the first operating part 7 of the operating member 6 to either the right or left turning side. The turning operation tool 1 is linked with the operating member so that when the direction setting valve 2 is operated by the first operating part 8 of the operating member 6 toward the right or left turning side, the pressure setting valve 3 is operated by the second operating part 8 of the operating member 6 to vary the actuation pressure of the turning device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turning operation structure of a working vehicle such as a combine.

[0002]

2. Description of the Related Art Conventionally, as a turning operation structure of a working vehicle such as a combine provided with a pair of right and left traveling devices such as a crawler, for example, when a turning operation tool is operated right or left from a neutral position, a spool type is used. The direction setting valve is operated to the right or left turning side, the right and left steering devices are given a speed difference, the aircraft is turned right and left, and the direction setting valve is operated to the right or left turning side. Then, the pressure setting valve of the variable relief valve structure, which is configured such that the expansion / contraction elastic force of the spring spring supporting the valve element can be changed by the cam member and the operating pressure can be changed, is operated, and There is a configuration in which the operating pressure is changed to change the turning radius of the fuselage to a large or small.

The direction setting valve and the pressure setting valve are provided with operation receiving levers, respectively, and are linked to each other by a linking wire mechanism such as a turning operation tool and a release wire. In the direction setting valve, a spool is provided. The pressure setting valve is operated, and the cam member is operated.

However, since such a turning operation structure of a working vehicle is integrally provided at a place where a lightweight and compact design is always required in a design such as a transmission case, the same applies. To reduce the number of parts
At present, there is a need to reduce the mounting space. SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and a main problem thereof is to provide a turning operation structure of a work vehicle capable of reducing the number of parts and reducing an installation space. On the point.

[0004]

According to a first aspect of the present invention, a turning structure of a working vehicle includes a pair of right and left traveling devices, and a right and left traveling device that is provided with a speed difference to move the body to the right. And a hydraulically operated turning device for turning to the left, a direction setting valve for setting the turning device to the right and left turning states, and changing the operating pressure of the turning device to change the turning radius of the fuselage to large or small. An operation member including a pressure setting valve, a turning operation tool that is artificially operated, and a first operation unit that operates the direction setting valve, and a second operation unit that operates the pressure setting valve. When the turning operation tool is operated right or left from the neutral position, the direction setting valve is operated to the right or left turning side by the first operation unit of the operation member, and the first operation of the operation member is performed. The direction setting valve is operated to the right or left turning side by the part. In this state, the turning operation tool and the operating member are linked so that the pressure setting valve is operated by the second operating portion of the operating member to change the operating pressure of the turning device. .

[Operation] The direction setting valve and the pressure setting valve can be operated in an interlocked state by operating the operation member via the turning operation tool.

[Effect] Accordingly, by analyzing the value of the turning operation structure of this kind of worker, operation components such as operation receiving levers and the like are respectively provided on the direction setting valve and the pressure setting valve as in the conventional structure. The number of parts is reduced as compared with the required structure, and the whole can be made compact.

According to a second aspect of the present invention, the turning operation structure of the working vehicle is characterized in that when the pressure setting valve is operated to the end of the operation stroke by the second operation portion of the operation member, the first operation member is operated. The operation stroke of the direction setting valve is set such that the direction setting valve is also operated by the operation unit.

[Operation] The direction setting valve and the pressure setting valve can always be operated in an interlocked state in the entire operation range in which the operation member can be operated via the turning operation tool.

[Effect] Therefore, as compared with the structure in which the direction setting valve and the pressure setting valve are separately operated, malfunctions are less likely to occur, and the reliability in use can be significantly improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example in which the present invention is applied to a turning operation structure of a combine will be described.

FIGS. 5 and 6 show a structure inside a transmission case MK of a traveling system of a combine, in which power from an engine E as a driving unit is transmitted via a belt transmission mechanism 62 having a tension clutch to a main transmission. Is transmitted to the input pulley 26 of the hydrostatic continuously variable transmission M. Of the power from the output shaft 11 of the hydrostatic continuously variable transmission M, only the forward rotation power is transmitted through the one-way clutch OC, the first transmission shaft 24, the output pulley 25, and the cutting clutch 63 to the cutting section A. To the input pulley 53A.

The power from the output shaft 11 is transmitted to the second transmission shaft 31 via the first gear 20. This second transmission shaft 3
A first high-speed gear 32 is externally fitted to 1 so as to be relatively rotatable, and a shift gear 13 is slidably mounted in a spline structure. The third transmission shaft 34 has a low-speed gear 3
5, the medium-speed gear 18 and the second high-speed gear 33 are attached in a spline structure, and the first and second high-speed gears 32, 33
Is biting. Thus, by sliding the shift gear 13 to engage the first high-speed gear 32, the medium-speed gear 18, and the low-speed gear 35, the power can be shifted to three stages of high, medium, and low. Is transmitted to the first output gear 17 that meshes with the first gear. As described above, the gear transmission type transmission 54 is configured.

Right and left side gears 22 are rotatably fitted on the support shaft 16 supporting the first output gear 17, and input gears 28 of the left and right axles 15 always mesh with the left and right side gears 22. -ing This allows
An occlusal type first clutch FC (corresponding to a side clutch) is formed between the right or left side gear 22 and the first output gear 17, and the convex engagement portion 23 of the side gear 22 is connected to the first output gear 17. The forward rotation power is transmitted to the right and left crawler-type running devices B, B by engaging with the right and left. or,
The spring 29 biases the side gear 22 toward the first output gear 17. As described above, the second transmission shaft 31
Thus, a normal rotation system driving mechanism is constituted by the shift gear 13, the medium speed gear 18, the first output gear 17, and the like.

A pair of second output gears 1 are provided on the left and right sides of the support shaft 16.
9, the second output gear 19 and the support shaft 16
And a second clutch RC of a multi-plate friction type. On the other hand, the second gear 2 is provided at both ends of the third transmission shaft 34.
1 is fixed, and a sleeve 48 is externally fitted to the bearing so that the third transmission shaft 34 can be slid left and right. In this case, the low-speed gear 35 and the medium-speed gear 18
The third transmission shaft 34
The low-speed gear 35 and the medium-speed gear 1
The position of 8 does not change. The second gear 21, the third gear 37, the fourth gear 38, the second output gear 19, the second clutch RC, and the like interlocked with the third transmission shaft 34 constitute a reverse rotation system drive mechanism.

The transmission 54 of the gear type
, A forward rotation system drive mechanism and a reverse rotation system drive mechanism constitute a hydraulically operated turning device D of left and right crawler type traveling devices B, B. Hereinafter, the operation of the turning device D will be described.

FIG. 5 shows a state in which the third transmission shaft 34 is being slid leftward on the paper, and a state in which the left and right second gears 21 are engaged with the left and right third gears 37.
In this state, the power of the third transmission shaft 34 is
The power is transmitted to the left and right second output gears 19 via the transmission shaft 49 and the fourth gear 38 in a reverse rotation state. Accordingly, for example, when the left side gear 22 is separated from the first output gear 17 and the second clutch RC is pressed and operated by the pressing portion 27 of the side gear 22, the reverse rotation power of the left second output gear 19 is transmitted to the left traveling device B. It will be transmitted and you can make a left turn. When the pressing force of the left side gear 22 is reduced and the second clutch RC is slid, the forward force of the right striker B and the driving force of the reverse rotation of the left striker 14 are balanced, and the left strike The device B is apparently stopped. This allows a pivot turn to the left.

Next, the third transmission shaft 3 is switched by the switching lever 47.
When the user slides 4 from the state shown in FIG. 1 to the right in the drawing, the left and right second gears 21 shift to the positions shown by the two-dot chain lines and directly mesh with the left and right second output gears 19. Thereby, the forward rotation power, which is lower in speed than the forward rotation power transmitted from the third transmission shaft 34 to the first output gear 17, is transmitted from the third transmission shaft 34 to the second output gear 19. Therefore, for example, when the second clutch RC is pressed and operated by the left side gear 22, the left traveling device B is driven to rotate forward at a lower speed than the right traveling device B, and the aircraft slowly turns left.

Next, the sliding operation structure of the side gear 22 will be described. As shown in FIGS. 5 and 6, an operation arm 30 for sliding the side gear 22 and a hydraulic cylinder 39 for swinging the operation arm 30 are provided. And
The hydraulic oil from the pump 40 is supplied to the direction control valve 2 for the hydraulic cylinder 39. The side gear 22 separates from the first output gear 17 (the first clutch FC is disengaged),
When the hydraulic cylinder 39 extends until the second clutch RC is moved to a position where the second clutch RC is not pressed and operated, a drain oil passage 42 is provided for removing hydraulic oil from the hydraulic cylinder 39 and stopping the hydraulic cylinder 39 at that position. . Further, the pressure setting valve 3 is provided in the drain oil passage 42.

The directional control valve 2 and the pressure setting valve 3 are juxtaposed in a valve case 4 attached to the side surface of the transmission case MK as shown in FIGS. A first operating portion 7 of a projecting operation member 6 fixed to a support shaft 5 rotatably supported around an axis P1 orthogonal to the spool 2A and the valve hole 3A of the pressure setting valve 3; It is configured to be able to perform an interlocking operation via a second operation unit 8 that is a cam member. Also,
An operation receiving arm 9 is fixed to one end of the support shaft 5 extending from the transmission case MK to the outside, and is linked to the operation lever 1 as a turning operation tool via a linking wire mechanism 10 such as a release wire. I have.

In the side view of the transmission case MK shown in FIG. 4, the operation receiving arm 9 penetrates the transmission case MK from the valve case 4 attached to the right side surface in the drawing, and is disposed on the right side surface. It is attached to one end of the support shaft 5 which is led out to a lower portion of the input pulley 26. The reason for this is that, as shown by a two-dot chain line in the figure, one end of the support shaft 5 may be led out to the right side surface to which the valve case 4 is attached, and the operation receiving arm 9 may be attached. This is because the width W1 of the configuration in which the operation receiving arm 9 is provided on the left side surface is smaller than the width W2 of this configuration, and there is an advantage that the overall configuration can be made compact.

The directional control valve 2 is connected to a spool 2A having a partition valve portion 2D for partitioning a valve chamber 12 in which a pump port, a drain port, and a supply / discharge port are formed. The valve state is switched via the switch 7. Specifically, the first end of the operation member 6 fixed to the support shaft 5 is provided at the other end of the spool 2A.
An operation receiving portion 2C that engages with the operation portion 7 is formed, and the first operation portion 7 of the operation member 6 is rotated left and right on the paper surface to move the spool 2A left and right to switch the valve state. It has become.

At one end of the spool 2A, a spring receiving plate 2B is provided via a flange, and a spring 11 is provided between the spring receiving plate 2B and the valve case 4.
Is provided, and the spool 2A does not act on the operation movement from the neutral position to the rear side, but the elastic movement force acts on the operation movement of the spool 2A from the neutral position to the front side, and when the operation is released, the spool 2A is released. The elastic biasing force returns to the original neutral position. Although not shown, the operation receiving arm 9 is formed by, for example, a helical spring provided around the support shaft 5 or a coil spring provided between the operation receiving arm 9 and the valve case 4. An elastic urging force acts on the spool 2A via the first operating portion 6A of the operating member 6 from the neutral position to the near side, and when the operation is released, the elastic neutralizing force causes the original neutral position. To return to.

The pressure setting valve 3 is provided with a valve seat 3B having a mortar-shaped valve hole 3A at an intermediate portion of the valve chamber located between the supply port 3C on the back side of the valve chamber and the drain port 3D. A pair of large and small spherical members 13A and 13B serving as a valve body is provided between the second operating portion 8 of the operating member 6 and the valve seat 3B, and constitutes the second operating portion 8 when not operated. The valley portion of the V-shaped cam coincides with the axis of the valve seat 3B, the spherical members 13A and 13B are most separated from the valve seat 3B, the valve hole 3A has the maximum opening, and the support shaft 5, the spherical member 13A, 13B is displaced left and right by rotating the second operating portion 8 upward and downward from the neutral position on the paper surface, and the opening degree of the valve hole 3A, which is the operating portion, is changed from full open to full. It can be operated until it is closed.

Next, the operation of the direction control valve 2 and the pressure setting valve 3 will be described. The state shown in FIGS. 1 and 5 is a straight traveling state in which the left and right side gears 22 mesh with the first output gear 17. When the operation lever-1 is operated from this state to, for example, the first turning position L1 on the left side, only the direction control valve 2 is switched to supply hydraulic oil to the left hydraulic cylinder 39 and the left side gear 22 to operate. It slides to the left on the paper and moves away from the first output gear 17 (the disengagement state of the first clutch FC). In this case, the drain oil passage 42 is opened at the neutral position before the left side gear 22 presses the second clutch RC, and the operating oil is released from the pressure setting valve 3.
Stops at the neutral position. This is a state in which transmission to the left running device 14 has been cut off. This will cause the aircraft to gently turn left.

Then, as shown in FIG. 2, when the operating lever-1 is turned to the left to operate the second turning position L2, the pressure setting valve 3 is closed and the hydraulic cylinder 39 extends from the neutral position. Then, the left second clutch RC is completely engaged and operated. In this case, as shown in FIG.
Has been slid to the left in the drawing, the left traveling device B is driven to rotate in the reverse direction.

When the operating lever-1 is located between the first and second left and right turning positions L1 and L2, the hydraulic oil is removed from the hydraulic cylinder 39 from the state described above, and the pressing force on the second clutch RC is reduced. Can be weakened. Thereby, the second clutch RC
Slides, and the left striker B stops. The position (the position at which the second clutch RC slides) and the second turning position L2
When the operation lever-1 is operated between the second clutch RC
Is changed, and the reverse rotation speed of the left traveling device B can be changed.

Conversely, with the third transmission shaft 34 slid rightward on the paper surface and the second gear 21 directly engaged with the second output gear 19, the operation lever-1 is moved to the left second turning position L2. , The left traveling device B is driven in a forward rotation state at a lower speed than the right traveling device B.

Further, when the operating lever-1 is operated between the left first turning position L1 and the second turning position L2, the pressing force on the second clutch RC is changed, and the left traveling device B rotates forward. You can change the speed. The above operation is similarly performed at the right first turning position R1 and the second turning position R2.

As shown in FIG. 7, in this combine, a hydraulic cylinder 90 for raising and lowering the cutting unit A is used.
A lifting section elevating device C is configured by mechanically linking an up / down switching valve 91 to the mowing section A, and the mowing section A can be moved up and down by rotating the operation lever 1 back and forth. It has become. Specifically, when the operation lever 1 is rotated rearward from the neutral position, the reaping unit A rises, and when the operation lever 1 is rotated forward from the neutral position, the reaping unit A descends.

As shown in FIG. 6, a manually operated opening / closing valve 46 is provided in the oil discharge passage 45 of the direction control valve 2.
A reaping and squeezing pedal 50 is provided at the foot of a control section of the fuselage so that the on-off valve 46 can be switched to a closed state.

Normally, the on-off valve 46 is in an open position by a spring. When the operation pedal 50C is depressed, the on-off valve 46
Is switched to the closed position, and the hydraulic oil from the pump 40 cannot be discharged from the oil drain passage 45, but is supplied to the left and right hydraulic cylinders 39. As a result, the left and right hydraulic cylinders 39 extend to drain oil from the drain oil passage 42,
Stop at the neutral position described above. The neutral position is such that the left and right side gears 22 are connected to the first output gear 17 as described above.
(The first clutches FC, FC are in the disengaged state) and the second clutch RC is not pressed and operated. As a result, the aircraft stops, but the power of the engine E is transferred from the output shaft 1 of the hydrostatic continuously variable transmission M to the first transmission shaft 2.
4 to the reaper A. The fourth transmission shaft 4
A parking brake 60 is provided at an end of the switch 9 and is linked to an operation mechanism (not shown).

[Other Embodiments] (1) In the above embodiment, the configuration in which the operation lever 1 of the turning operation structure and the operation receiving arm 9 of the operation member 6 are linked via the link wire mechanism 10 has been described. The present invention is not limited to this, and may have a configuration in which both are connected via a link.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a turning operation structure according to the present invention.

FIG. 2 is a configuration diagram showing a turning operation structure.

FIG. 3 is a sectional view of a main part showing a direction setting valve and a pressure setting valve.

FIG. 4 is a simplified front view showing a relationship between a mission case and an operation receiving arm.

FIG. 5 is a configuration diagram showing a strike transmission mechanism and a mowing transmission mechanism.

FIG. 6 is a configuration diagram showing a relationship between a turning operation tool and left and right side clutches.

FIG. 7 is a configuration diagram showing a relationship between a turning operation tool and a mowing unit elevating device.

[Explanation of symbols]

 B Running device D Turning device 1 Turning device (operating lever) 2 Direction setting valve 3 Pressure setting valve 6 Operating member 7 First operating portion 8 Second operating portion

Claims (2)

[Claims] 1. A left-right pair of running devices, and a hydraulically operated turning device that gives a speed difference to the right and left running devices to turn the body right and left, and turns the turning device right and left. A direction setting valve for setting a state, a pressure setting valve for changing the operating pressure of the turning device to change the turning radius of the fuselage to a larger or smaller size, and a turning operation tool that is artificially operated; An operation member including a first operation unit for operating a valve and a second operation unit for operating the pressure setting valve, wherein when the turning operation tool is operated right or left from a neutral position, the operation is performed. In a state where the direction setting valve is operated to the right or left turning side by a first operating portion of the member, and the direction setting valve is operated to the right or left turning side by the first operating portion of the operating member, The pressure setting valve is operated by the second operating portion of A turning operation structure for a working vehicle, wherein the turning operation tool and the operating member are linked so that the operating pressure of the turning device is changed. 2. The method according to claim 1, wherein when the pressure setting valve is operated to the end of an operation stroke by a second operation portion of the operation member, the direction setting valve is also operated by a first operation portion of the operation member. The turning operation structure for a working vehicle according to claim 1, wherein an operation stroke of the direction setting valve is set.