JPH0856467A - Hydraulic operating device in mobile working car - Google Patents

Abstract

PURPOSE: To simplify the assembling of a hydraulic operating device for performing the lifting and lowering of an working device and steering of a machine body and improve the operation feeling. CONSTITUTION: This hydraulic operating device in a mobile working car is obtained by integrally connecting a lifting and lowering valve (65) to a steering valve (62) as a unit, internally installing and attaching the connected valve body (A) to a control panel (4), installing a spherical body joint (64) capable of supporting one operating lever (59) facing onto the control panel (4) and enabling the machine body to tilt in the front, rear, left and right directions of the machine body in the top surface of the valve body (A), interlocking and linking the lifting and lowering valve (65) and the steering valve (62) so as to respectively operate by the tilting operation of the operating lever (59).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic operating device for a traveling work vehicle in which a working device mounted on the machine body is moved up and down and the steering of the traveling vehicle is switched by a hydraulic device.

[0002]

2. Description of the Related Art Conventionally, an operation panel is provided in front of a driver's seat on the front of a machine body with operation steps separated from each other, and a working machine mounted on the machine body is moved up and down by a hydraulic device. In addition, a lifting valve for controlling the lifting and lowering of the working machine and a steering valve for controlling the switching of the steering device are provided near the respective devices, and these valves and the operation panel are provided. A traveling work vehicle in which an operation lever and an operation lever are connected by an operation wire or an operation link is already known.

[0003]

In the above-described known traveling work vehicle, since the valves are arranged at the positions apart from the passive body that responds to the operation of the operation lever, the operation lever and the valves are interlocked and linked. Assembling the operating wires or operating links to be used is complicated, and since they are complicated inside the operating panel, etc., a large space is required to prevent them from interfering with each other, and the aircraft eventually becomes large. Further, when the operation force transmission means for interlocking and connecting the operation lever and each valve is an operation wire, it is extended by use, and when it is an operation link, many connecting parts are worn, so that any of them is worn. In such cases, the transmission of the manipulated variable was inaccurate, and it was necessary to make adjustments such as occasional inspections and reduction adjustments to prevent this. Further, there is always a play between the operating lever and the valve and the operating force transmitting means, which hinders the feeling when the operating lever is operated, and at the time of assembling the operating lever. Since each valve must be separately assembled to the machine, the number of assembly steps increases,
Moreover, there is a problem that these adjustments are required after the assembling, and the cost cannot be reduced as a whole.

[0004]

SUMMARY OF THE INVENTION According to the present invention, an operation panel is erected in front of a driver's seat provided in a front portion of a machine body with operation steps separated from each other, and a work machine mounted on the machine body is lifted and steered. In a traveling work vehicle in which the device is switched by a hydraulic device, an elevating valve and a steering valve of the hydraulic device are integrally connected as a unit, and the combined valve body is mounted inside the operation panel. A ball joint that supports one operation lever facing the operation panel and is tiltable in the front-rear and left-right directions of the machine body is attached to the upper surface of the valve body, while the ball joint and the lifting valve and the steering valve are connected. The upper and lower parts of the spool, which are in the vertical direction, are connected to each other via two operation pins, which are in the front-rear direction and the left-right direction of the machine body, and the lifting valve and the steering valve are operated by tilting the operation lever. Solves the problems described above by respective interlocking cooperative to switching operation.

[0005]

When the lift valve and the steering valve are mounted on the operation panel, the lift valve and the steering valve are integrally connected as a unit. Therefore, the operation lever is supported on the upper surface of the combined valve body. A ball joint that allows tilting in the front-rear and left-right directions of the machine body is installed in advance, and the valve body with this ball joint integrally attached is assembled to the operation panel as it is. When the operation lever facing the operation panel is tilted in the front-rear and left-right directions of the machine body, the lifting valve and the steering valve are switched by the two operation pins provided between the upper end of each spool and the ball joint. Because
The operation amount (tilt amount) of the operation lever in the front-rear direction or the left-right direction is accurately transmitted to each spool, and the working machine is moved up and down or the work vehicle is swung by the hydraulic pressure corresponding to the operation amount.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. A threshing device 3 is mounted on one side of a machine base 2 having a traveling device 1 and an operation panel 4 is installed on the other side in order from the front. Driver's seat 5
And a paddy processing unit 6 is provided, an engine is provided in the lower part of the driver's seat 5, and a pretreatment device 7 including a harvesting device and a grain culm transporting device is tilted up and down by a pretreatment frame in the front part of the threshing device 3. A single-acting hydraulic cylinder 6a is interposed between the front portion of the machine base 2 and the pretreatment frame so that the pretreatment device 7 can be tilted up and down. Threshing device 3 in operation step 8
A mission case 10 is provided at a lower portion near the input shaft 13, and an input shaft 13 driven by a belt with a tension clutch 11 by the engine is provided on an upper rear portion of the mission case 10. A drive shaft 15 to which a drive split pulley 14 of the transmission is attached,
A driven shaft 20 which supports a pump shaft 16 and which is supported on an upper front side and has a driven split pulley 18 with a multi-plate clutch 17 attached to a protruding portion, and a mowing driven by the driven gears 21 and 22. The drive shaft 23 is supported, and the auxiliary transmission shaft 25, the counter shaft 26, and the axle 30 supported from the driven shaft 20 to the lower end of the mission case 10 are supported.
A side clutch shaft 27 is supported, and a crawler sprocket 28 is attached to the axle 30. A forward gear 33 and a reverse gear 35 rotatably supported on the driven shaft 20.
The main transmission clutch 36, which is spline-fitted with the main transmission gear 71, is moved left and right by the main transmission lever 71 via the shifter 37 and the like, and the cylinder shaft 38 loosely fitted to the cutting drive shaft 23 is meshed with the forward gear 33. The gear 39 and the gear 40 meshing with the gear 34 spline-fitted to the auxiliary transmission shaft 25 are fixed, and the reverse gear 35 is also meshed with the gear 34. The sub-transmission gear 41 is a small-diameter gear, a large-diameter gear, and a medium-diameter gear in order from one side, and is spline-fitted to the sub-transmission shaft 25 slidably. A large gear 42, a small gear 43, and a middle gear 45, in which the respective large, medium, and small gears are selectively meshed, are fixed, and a center gear 46 rotatably supported at the center of the side clutch shaft 27 is the small gear. 43 has a clutch on both sides of the shaft supporting portion, and a pair of left and right side clutch gears 48, 50 transmits the rotation on both sides thereof but is slidably mounted on the left and right sides. Side brakes 51 and 52 are mounted on the outer sides of the pistons 50, 50, and a piston 53, which is oil-tightly supported above and constitutes a steering switching device, has a pair of left and right flanges 55 and 56.
The bent portions at the tips of the shifters 57, 58 whose lower ends are loosely fitted in the circumferential grooves of the side clutch gears 48, 50 face the inside of the flanges 55, 56 of the piston 53, and both ends of the piston 53 are The inserted oil chambers 60 and 61 are connected to a pump 63 via a steering valve 62 as shown in a hydraulic circuit diagram (Fig. 6).

The steering valve 62 and the lifting valve 65 of the hydraulic cylinder 6a of the pretreatment device 7 are housed in a valve body A integrally connected as a valve unit, and a spherical joint mounted on the upper surface of the valve body A. 64
Supports one operation lever 59 that faces the operation panel 4 and tilts in the front-rear, left-right direction of the machine body. Also, the spherical joint 64
The upper ends of the spools 62a and 65a in the vertical direction of the steering valve 62 and the lifting valve 65 respectively have two operating pins 64a in the front-back and left-right directions of the machine body.
64b, and when the operation lever 59 is tilted in the front-back direction or the left-right direction of the machine body, the spool 65a of the lifting valve 65 or the steering valve 62 is connected.
The spool 62a is moved up and down, and the raising / lowering valve 65 or the steering valve 62 is interlocked and linked so as to be switched. The valve body A is attached to a bracket which is fixed to a cross rail connecting left and right struts, which is a skeletal member of the operation panel 4, and when these valve bodies A are assembled to the operation panel 4, a spherical body is formed on the upper surface of the valve body A. The joint 64 is attached in advance, and then the valve body A integrally attached with the spherical joint 64 is assembled to the operation panel 4 as it is. The spool 65a of the lifting valve 65
A projection 65b is fixed to the side surface of the upper end of the operation panel 4
The lock shaft 67 rotatably supported on the
8 is formed by cutting the outer periphery of the inner end portion in a crescent shape so as to allow the protrusion 65b to descend. The outer peripheral surface without the notch serves as a lowering stopper 69, and an outer L-shaped rising stopper is provided outside thereof. 70 is fixed. A cam attached to the drive split pulley 14 for expanding and contracting the V-groove width is composed of a fixed cam 74a and a movable cam 74b which are integral with the transmission case 10, and a hydraulic cylinder connected to the movable cam 74b. 73 is connected to a transmission valve 75 attached to the pump 63.

The hydraulic circuit will be described in more detail with reference to FIG. 6, which shows a hydraulic circuit of the speed change valve 75, the steering valve 62, and the lifting valve 65. The neutral position is connected in series by an oil passage 76 so as to communicate with the pump 63 when they are both in the neutral state, and the elevating valve 65 is positioned closer to the pump 63 than the steering valve 62 so that it is prioritized. In the oil supply oil passages 77, 78 of both valves 62, 65 and the oil passage 80 bypassing those valves 62, 65, the throttle valve 8 is provided.
1, 82, 83 are provided to limit the inflow amount, so that the respective hydraulic operating parts can be operated simultaneously, and the return oil passage of the elevating valve 65 is also provided with the throttle valve 85 so that the pretreatment device 7 can be operated. The hydraulic oil outflow speed from the single-acting hydraulic cylinder 6a that is reduced by its own weight is limited, and the hydraulic oil to the speed change valve 75 is supplied by the oil passage 86. In this hydraulic circuit, when the continuously variable transmission is operated to shift by another means, the oil passage 86 is not necessary. Therefore, as shown by the dotted line, the points a and b are connected to form the valve body A. It is possible to have two ports, and when operating the continuously variable transmission by a hydraulic system as in this embodiment, there are three ports, but by unitizing as described above, the hydraulic hose The number can be reduced, and a complicated link mechanism for operating the valve can be omitted.

In the above-mentioned combine, the lock shaft 67 is rotated to evacuate the lowering stopper 69 and the raising stopper 70 out of the ascending / descending locus of the spool 65a and the projection 65b protruding from the spool 65a during work or traveling on the road. When the main transmission clutch 36 is moved to the left or right by tilting the main speed change lever 71 to the left or right at the neutral position in the non-acting position, it switches to forward or reverse, and the continuously variable transmission tilts the main speed change lever 71 from the neutral position to the front. Then, when the auxiliary transmission gear 41 is moved to the left or right by the auxiliary speed change lever 72, the speed is increased to a high speed, a medium speed, or a low speed. When the operating lever 59 is tilted to the left, the steering valve 62 is switched so as to pump the hydraulic oil from the pump 63 to the oil chamber 60 on the left side, whereby the piston 53 slides to the left side, and the piston 53 on the side moves. The flange 55 tilts the upper part of the shifter 57, whose middle part is pivotally supported, to the right side, so that the clutch gear 48 on the left side is disengaged, and in this state, the aircraft gently turns to the left and further tilts the operation lever 59 to hydraulically operate. If you increase the power and tilt the shifter 57,
The side brake 51 is activated and the aircraft makes a sharp turn to the left. When turning the machine body to the right, tilting the operating lever 59 to the right causes the piston 53 to slide in the opposite direction to the above, so the machine body turns to the right. Further, when adjusting the mowing height, rotating the machine body, or raising / lowering the pretreatment device 7 during traveling on the road, etc., tilting the operating lever 59 backward pushes down the spool 65a of the raising / lowering valve 65. , The hydraulic oil from the pump 63 is pressure-fed to the lifting hydraulic cylinder 6a to raise the pretreatment device 7, and when the pretreatment device 7 tilts forward, the spool 65a is pulled up so that the hydraulic fluid in the hydraulic cylinder 6a is removed. Is discharged to the tank by its own weight, and the pretreatment device 7 descends. It should be noted that when a hand is released from the operation lever 59, it is returned to the neutral position by a return spring or the like. Thus, when the traveling device 1 or the pretreatment device 7 is to be maintained or traveling on the road, the pretreatment device 7 is raised to a desired height by the operation lever 59, and the lock shaft 67 is held by the grip portion 68. By rotating as shown in FIG. 2 to move the raising stopper 70 onto the upper end surface of the spool 65a and the lowering stopper 69 below the protrusion 65b,
Even if you try to tilt the operating lever 59 back and forth, the spool 65
The ascending of a is done by the ascending stopper 70 and the spool 6
As the lowering 5a receives the projection 65b by the lowering stopper 69, the pretreatment device 7 does not move up and down.

[0010]

Since the present invention is configured as described above, it has the following effects. (1) When the operation lever 59 facing the operation panel 4 is tilted in the front-rear, left-right direction of the machine body, the lifting valve 65 and the steering valve 6
2 is switched and operated via the two operating pins 64a and 64b provided between the upper ends of the spools 65a and 62a and the spherical joint 64, so that the operating amount (tilt amount) of the operating lever 59 can be accurately adjusted. , 62a, the hydraulic pressure corresponding to the operation amount of the operating lever 59 allows the working machine to be lifted or lowered or the working vehicle to be swung with good feeling. (2) Further, these valves 65 and 62 and the operating lever 59
When assembling to the operation panel 4, the ball joint 64 for supporting the operation lever 59 is previously attached to the upper surface of the valve body A which integrally connects the lifting valve 65 and the steering valve 62, and is assembled to the operation panel 4. Since it can be attached, it is not necessary to separately assemble the operation lever 59 and the valves 65 and 62 to the operation panel 4 in a narrow working space, and the operation lever 59 is provided with a strong valve body A via the spherical joint 64. Since it can be directly supported on the operation lever 59, the operation lever 59 is attached to the operation panel 4 through a separate attachment member,
The stable operation of the lever can be performed in a state in which the operation lever 59 is always reliably supported by the valve body A without making the support of the operation lever 59 unstable. (3) Furthermore, the ball joint 64, the lifting valve 65, and the steering valve 62 are respectively arranged in the vertical direction of the spools 65a, 62.
By connecting the upper end portion of a through the two operation pins 64a and 64b, the operation lever 59 and the valves 65 and 6 are connected.
2 can be linked and linked, and the assembly adjustment work and the like required when the operating lever 59 and each valve 65, 62 are linked by a complicated operating link can be omitted, and the subsequent adjusting work is also unnecessary. Therefore, the cost can be reduced as a whole.

[Brief description of drawings]

1A is a perspective view of a valve unit, and FIG. 1B is a front view of a stopper.

FIG. 2 (a) is a perspective view of the stopper in a working posture, and FIG. 2 (b) is a front view thereof.

FIG. 3 is a vertical sectional view of a main part.

FIG. 4 is a vertical sectional view of a transmission.

FIG. 5 is a developed plan view of the transmission.

FIG. 6 is a hydraulic circuit diagram.

FIG. 7 is a plan view of a driving unit.

FIG. 8 is a right side view of the combine.

FIG. 9 is a left side view in which a rear portion of the combine is omitted.

[Explanation of symbols]

 4 Operation Panel 5 Driver's Seat 7 Work Machine 8 Operation Step 48 Side Clutch Gear (Steering Device) 50 Side Clutch Gear (Steering Device) 59 Operation Lever 62 Steering Valve 62a Spool 64 Ball Joint 64a Operating Pin 64b Operating Pin 65 Lifting Valve 65a Spool A Valve body

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location G05G 9/047

Claims (1)

[Claims] 1. An operation panel (4) is erected in front of a driver's seat (5) provided on the front of the machine body with a driving step (8) in between, and a working machine (7) mounted on the machine body is elevated and lowered. And steering device (4
In a traveling work vehicle in which 8) and (50) are switched by a hydraulic system, the lifting valve (65) and the steering valve (62) of the hydraulic system are integrally connected as a unit, and the combined valve is connected. A ball joint that allows the body (A) to be installed inside the operation panel (4) and supports one operation lever (59) facing the operation panel (4) so that the body (A) can be tilted in the front-rear and left-right directions of the machine body. (6
4) is mounted on the upper surface of the valve body (A), while the ball joint (64) and the lifting valve (65) and steering valve (62) are respectively in the vertical direction spools (65a), (62a). The upper end of each of them is connected via two operation pins (64a) and (64b) in the front-rear direction and the left-right direction of the machine body, respectively, and by the tilting operation of the operation lever (59), the lifting valve (65) and the steering valve are operated. Valve (6
A hydraulic operating device for a traveling work vehicle, characterized in that 2) are interlockingly linked so as to be switched.