JPH079734Y2 - Steering operation device for work vehicle - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial field of application The present invention relates to a steering operation device for a working vehicle such as a combine, and more specifically, a hydraulic actuator for left and right side clutches and a left and right side brake by switching a switching valve. A steering operation device for a working vehicle in which a hydraulic actuator is appropriately operated to engage and disengage, brake and release the left and right side clutches and left and right side brakes, respectively, to steer the traveling machine body.

(B) Conventional Technology Generally, in a working vehicle, for example, a combine, the left and right side clutch levers are used to operate the left and right side clutch / brake devices. A mono-lever consisting of one lever is provided on the operation panel. When the mono-lever tilts left and right by a predetermined angle, the side clutch is disengaged via the solenoid valve, and when the mono-lever tilts more than a predetermined angle, the variable relief valve is operated. Then, a monolever device for controlling the left and right brakes has been proposed.

(C) Problems to be solved by the invention However, in the above-mentioned monolever device, since the side clutch is connected / disconnected and the side brake is braked / released by tilting operation of one monolever, switching of the side clutch is performed. It is difficult to distinguish between the range and the switching range of the side brakes.This may cause only the side clutch to be disengaged, but the side brakes will also operate, causing the traveling machine to turn against the operator's will, which may pose a danger. There is
It takes skill to properly use the side clutch and the side brake. Also, since the variable relief valve is controlled by tilting the mono-lever, the operating load is increased when the side brake is operated, which reduces the operator's feeling of operation and increases the manpower during steering operation. ing.

(D) Means for Solving Problems The present invention is intended to solve the above-mentioned problems, and for example, as shown in FIGS. 4 and 5, left and right side clutches and left and right side brakes. In addition to the above, in the working vehicle 1 in which the electromagnetic switching valve is switched and operated so that pressure oil is appropriately sent to the hydraulic actuators for the left and right side clutches and the hydraulic actuators for the left and right side brakes by tilting one operating lever 22, One variable relief valve 77 (see FIG. 1) is communicated with the oil passage to the left and right side brake hydraulic actuators, and the operating lever 79 is connected to the operating portion 79 of the variable relief valve.
Mechanically interlocking with the operating pedal 86 installed on the traveling machine body, the electromagnetic switching valve is actuated by tilting the operating lever 22 to supply pressure oil to either the left or right side brake hydraulic actuator. Feeding, and further tilting operation of the operation lever and / or the operation pedal
It is characterized in that the variable relief valve 77 is subjected to variable throttle control by a pedaling operation of 86 to brake / operate one of the left and right side brakes.

(E) Operation Based on the above-described configuration, when the operation vehicle 22 is steered in the field to perform work such as mowing, when the operation lever 22 is tilted to the right, for example, the electromagnetic switching valve is switched to the right side clutch. Pressure oil is sent in the order of the hydraulic actuator and the right side brake hydraulic actuator. On this occasion,
The hydraulic actuator for the right side clutch fully operates and disconnects the right side clutch, but the oil path to the hydraulic actuator for the right side brake is a relief that operates the actuator slightly and slightly operates the right side brake. Since pressure oil is supplied only by pressure, a large braking force is not generated in the right side brake. As a result, the working vehicle 1 is corrected to the right. In this state,
By further tilting the operating lever 22 and assisting the operation of the operating lever with a large pedaling pressure by the pedal 86, the variable relief valve 77 is controlled by the variable throttle to control the oil passage to the hydraulic actuator for the right side brake. The hydraulic pressure is increased so that the hydraulic actuator starts to strongly brake and actuate the right side brake, and thus the working vehicle 1
Is turned to the right.

Also, when the operation lever 22 is tilted to the left, the working vehicle 1 is corrected to the left or turned in the same manner as when the operation lever 22 is tilted to the right.

(F) Example Hereinafter, an example in which the present invention is applied to a combine and embodied will be described with reference to the drawings.

As shown in FIG. 4, the combine 1 has a traveling body 3 supported by a crawler 2, and one side portion of the traveling body 3 has a driver seat 5, a Glen tank 6 and an engine 7 from the front. Is provided, and the automatic thresher 9 is provided on the other side. Further, in front of the machine body 3, a pretreatment unit 10 is supported so as to be able to move up and down, and the pretreatment unit 10 is provided with a large number of dividers 11, a plow-up device, a cutting blade, a grain culm conveying device, and the like. In addition, a mission case 12 is mounted inside the driver's seat 5. In the driver's seat 5, a driver's seat frame 15 is fixed on a body frame 13, and a step surface 16 is fixed on the front part of the frame 15 and a seat frame is mounted on the rear part thereof. Seat 19 is installed through.

On the other hand, an operation console 20 is erected above the front part of the driver's seat frame 15, and an upper surface of the operation console 20 is an operation panel 21. Further, a mono lever 22 is erected on the operation panel 21, various operation switches, a meter and an indicator lamp are provided, and manual side clutch levers 23, 23 are provided on both sides of the operation console 20. Each of them is installed so as to be rotatable in the front-rear direction of the machine body and normally prevented from rotating by a stopper.

Further, as shown in FIGS. 2 and 3, a pipe 46 is fixed to the operation table 20 above a supporting member 43 which is erected inward thereof via a fixing member 45, and is fitted into the pipe 46. One end of the manual side clutch lever 23 is fixed to the shaft 47 via a bracket 49. Further, brackets 50 and 51 are fixed to both ends of the pipe 46, and a mounting plate 52 is vertically erected and fixed by the brackets 50 and 51, and a lever bracket 53 is attached to the mounting plate 52.
Are fixed with multiple bolts 55 ... The lever bracket 53 is provided with a pivot pin 56 which is erected and fixed at a substantially central portion thereof, and a stopper pin 56 is provided below the pivot pin 56.
57 is fixed.

Further, the monolever 22 has a pivot support plate 59 fixed to the lower end thereof, and a lever boss portion 60 fixed to the pivot support plate 59 substantially at the center thereof. 60
The monolever 22 is supported so as to be swingable left and right by fitting the pivot lever 56 to the pivot pin 56 of the bracket 53. Also,
A spring 63 and spring plates 65 and 66 are fitted and inserted into the lever boss portion 60, and the plates 65 and 66 are composed of two plate members having the same shape. Both ends of the spring 63 are inserted. The stopper pin 61 of the monolever 22 and the stopper pin 57 of the lever bracket 53 are
Spring plates 65, 66 biased by spring 63
The respective key portions of are contacted with each other, whereby the monolever 22 is configured to be in the neutral position in the normal state. Also, the monolever on the pivot pin 56
A rotary switch 67 is fitted on the rear surface of the pivot support plate 59 of 22. The rotary switch 67 operates the solenoids for the side clutch solenoid valve and the side brake solenoid valve in this order in synchronism with the left and right tilting movement of the monolever 22, thereby operating one of the left and right side clutch hydraulic actuators. Actuating disengages the side clutch and actuates either the left or right side brake hydraulic actuator. In this case, since the relief pressure is low, the hydraulic actuator for the side brake operates the side brake to such an extent that the multiple plates slightly contact each other. Furthermore, a switch mounting plate 69 is fitted in the hole at the tip of the pivot pin 56, and
The mounting plate 69 is fixed to the tip portion of the pin 56 by screwing a bolt 70 into the bolt hole at the tip of the 56.

On the other hand, to explain the basis of the present invention, as shown in FIG. 1 and FIG. 2, a brake operating pedal 70 is pivotally supported on a bracket 68 which is erected and fixed below the operation console 20.
It is rotatable in the machine front-rear direction by 71 and is urged toward the front of the machine by a spring 73. The pedal 70 has its one end 70a in contact with the operation base bottom 20a so that the pedal 70 can be rotated upward in a predetermined position. And the downward rotation is restricted at a predetermined position by a stopper bolt 75 standing and fixed below the other end 70b. Further, one end of a wire 76 is attached to one end 70a of the brake operating pedal 70, and the other end of the wire 76 is attached to one end of an operating arm 80 for operating a plunger 79 of one variable relief valve 77. ing. Further, the variable relief valve 77 is communicated with the oil passages to the hydraulic actuators for the left and right side brakes that operate the left and right side brakes, respectively. The hydraulic pressure of the oil passage to the hydraulic actuator is increased so that the braking force of the side brake can be adjusted appropriately.

Since this basic structure has the above-mentioned structure,
When the combiner 1 is steered to perform a mowing operation, if the operator tilts the monolever 22 to the right, for example, the lever 22 resists the biasing force of the spring 63 received via the spring plate 66. Rotate about the pivot pin 56. Then, the rotary switch 67 is rotated by the monolever 22, which energizes the side clutch solenoid valve to operate the right side clutch hydraulic actuator, disconnects the right side clutch, and energizes the side brake solenoid valve. Activate the hydraulic actuator for the right side brake. On this occasion,
Since the hydraulic pressure of the oil passage to the hydraulic actuator for the right side brake is low, the side brake is actuated to such a degree that the multiple plates are lightly contacted. In this state, when the operator depresses the other end 70b of the brake operation pedal 70, the pedal 70 rotates counterclockwise in FIG.
76 is towed, which causes actuating arm 80 to move plunger 79
Is pressed to operate the variable relief valve 77, and the pressure of the oil passage to the hydraulic actuator for the side brake is controlled by the variable throttle control to be increased. Therefore, the hydraulic actuator for the right side brake operates with a force corresponding to the stepping pressure on the operation pedal 70 to properly brake and operate the right side brake. As a result, the combine 1 turns right. Also, when the monolever 22 is tilted leftward, the left side clutch is disengaged and the left side brake hydraulic actuator is actuated in the same manner as when tilted rightward.In this state, the brake operating pedal 70 is depressed. By doing so, the side brake is braked and actuated, whereby the traveling machine body 3 turns to the left.

Next, an embodiment of the present invention in which both the monolever 22 and the brake operating pedal are linked to the variable relief valve 77 will be described with reference to FIGS. 5 and 6.

An operating arm 80 is rotatably installed inside the operation console 20, and at one end of the operating arm 80, wires 81, 81 and a variable relief valve that are pulled upward in conjunction with tilting of the monolever 22 are provided. The wire 82 connected to the 77 is connected and attached. Further, a bracket 83 is erected and fixed below the operation table 20, and a brake operation pedal 86 is rotatably installed on the bracket 83 by a pin 85, and one end of the operation pedal 86 operates as described above. Rotation beyond a predetermined position is restricted by a stopper bolt 87 that is attached to the tip of the arm 80 and the other end of which is erected on the step 16.

Therefore, when the monolever 22 is tilted to one of the left and right directions, for example, to the right, the solenoid valve for the side clutch is switched by the operation, the hydraulic actuator for the right side clutch is actuated, and the right side clutch is disengaged. The solenoid valve for the brake is also switched so that pressure oil is supplied to the hydraulic actuator for the right side brake at a low relief pressure. In this state, the combine 1 is corrected to the right. And combine 1
When turning, the operator tilts the monolever 22 further to the right, depresses the brake operating pedal 86, and pulls the wire 82 by the combined force of the monolever 22 and the operating pedal 86. As a result, as shown in FIG. 7, the operating force of the monolever 22 that increases in proportion to the relief pressure that rapidly increases at the final end of the lever stroke can be assisted by the stepping pressure of the operating pedal 86, The operating force of the monolever 22 can be reduced. Then, the variable relief valve 77 is subjected to variable throttle control, the hydraulic pressure of the oil passage to the hydraulic actuator for the right side brake is increased, and the right side brake is braked and operated, whereby the combine 1 turns right.
Further, when the combine 1 is corrected to the left or turned, the same operation as described above is performed. Therefore, when the side brake is operated, the brake operation pedal 86 can be depressed to assist the tilting operation of the monolever 22,
The load at the time of braking the mono lever 22 can be reduced to improve the operation feeling.In addition, by operating the lever with the operation pedal 86 stepped on in advance, the side brake can be quickly braked and actuated, resulting in quick operation. You can perform various turning operations. Further, it goes without saying that the side brake may be operated only by the mono lever 22 or only by the brake operating pedal 86.

(G) Effect of the Invention As described above, according to the present invention, the operation lever 22
Pressure oil is sent to the hydraulic actuator for the side brakes by tilting, and the variable relief valve 77 is controlled by variable depression by operating the operation pedal 86, so that one of the left and right side brakes is braked and operated. So
Even though it has a simple structure, the braking operation of the side brakes can be performed in addition to or separately from the operation of the operation lever 22, and the skilled artisan can make a delicate distinction between the side clutch switching range and the side brake switching range. By doing so, it is not necessary to learn it, the steering operation can be simplified, and the lever operation can be lightened to reduce the burden on the operator.

Further, since the variable relief valve 77 is also variable throttle controlled by the operation lever 22, the side brake can be controlled by only the operation lever 22 or the operation pedal 86, and the operation lever 86 is used as an auxiliary lever. 22 It is possible to reduce the load during operation and improve the operation feeling.

[Brief description of drawings]

FIG. 1 is a side view showing an operation pedal of a steering operation device according to the present invention, FIG. 2 is a front view showing an operation lever thereof, FIG. 3 is a side view thereof, and FIG. FIG. 5 is a side view showing the entire combine, FIG. 5 is a perspective view of a driver's seat showing another embodiment, and FIG. 6 is a side view thereof. FIG. 7 is a diagram showing the correlation between the relief pressure and the lever operating force with respect to the lever stroke. 1 ... Work vehicle (combining), 3 ... Traveling vehicle, 22 ...
… Operating lever (mono lever), 86… Operating pedal, 76…
… Wire, 77… Variable relief valve, 79… Operating part,
80 ... Actuating arm.

Claims (1)

[Scope of utility model registration request] 1. An electromagnetic switching valve comprising left and right side clutches and left and right side brakes, and by appropriately tilting one operating lever, pressure oil is appropriately sent to the left and right side clutch hydraulic actuators and the left and right side brake hydraulic actuators. In a working vehicle in which the operation is switched, one variable relief valve is connected to the oil passage to the hydraulic actuators for the left and right side brakes, and the operation lever is mechanically interlocked with the operation portion of the variable relief valve. In addition, the operation pedal installed on the traveling machine body is mechanically interlocked, and the electromagnetic switching valve is actuated by the tilting of the operation lever to send pressure oil to either one of the left and right side brake hydraulic actuators, and the operation lever. The tilting operation and / or the stepping operation of the operation pedal. A steering operation device for a working vehicle, characterized in that a variable relief valve is controlled by a variable throttle so that either one of the left and right side brakes is braked / operated.