JPH0725279B2 - Hydraulic system for work vehicle - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hydraulic device in a working vehicle such as a combine, and more particularly to centralization of valves and oil passages and their arrangement.

(B) Conventional technology Generally, in a work vehicle, especially in a combine, each device such as a continuously variable transmission, a side clutch, a pretreatment unit, and a hydraulic clutch is controlled by a hydraulic actuator. The solenoid valves and the like are not arranged centrally, but are arranged in the vicinity of the respective devices in a distributed manner. Therefore, many valves are installed near the mission case where each device is concentrated.

(C) Problems to be solved by the invention For this reason, an oil passage communicating between the hydraulic pump and each valve,
In addition, the electric wiring that connects the electric control panel and each solenoid valve is complicated and long, causing a malfunction.
When a failure occurs, it is necessary to replace or repair the valve in a deep and narrow place, which makes maintenance very troublesome. In particular, the valve near the mission case may have a secondary failure due to repair because dust such as muddy water, mud, and rice is accumulated around the valve.

Therefore, an object of the present invention is to eliminate the above-mentioned problems by centralizing valves and arranging them in a place where maintenance is easy.

(D) Means for Solving the Problems The present invention has been made in view of the above circumstances, and includes various devices such as the continuously variable transmission 57, the side clutch, the preprocessing unit 23, and the hydraulic clutch in the hydraulic actuator 20, 23A, 57A, RA, FA, B
In a work vehicle operating at A, a valve body including a block 31b forming a control oil passage for each of the hydraulic actuators and valves V1 to V10 for controlling the hydraulic actuators arranged on the block 31b. 31, an electric control panel 32 for controlling each valve of the valve body, a driver's seat frame 24 having a step surface 25 in the front part and a seat frame 12 standing upright in the rear part, and installed in the seat frame 12 And a seat 27 that has been installed, the valve body 31 is arranged on the driver seat frame 24 below the seat, and the electric control panel 32 is arranged in a space below the seat. On the device.

Specifically, below the seat 27 fixed and supported by the seat frame 12 on the driver's seat frame 7, and on the driver's seat frame 7, a block 31a having a predetermined oil passage is placed and fixed. Then, on the block 31a, a solenoid valve V1 for continuously variable transmission, a solenoid valve V2 for side clutch, a solenoid valve V3 for lowering a pretreatment section, a solenoid valve V4 for raising the same, an unloading solenoid valve V5, a pretreatment section Manual lowering valve V6, brake solenoid valve V7, forward hydraulic clutch solenoid valve V
8, a reverse hydraulic clutch solenoid valve V9, a clutch petal variable relief valve V10, and a filter F are provided. Further, the periphery of the seat frame 12 is covered with a cover, and an electric control board 32 for controlling each solenoid valve is installed on the step surface side front cover 16a in the cover, and a side cover outside the fuselage is provided. 16b can be opened and closed freely.

(E) Operation Based on the above configuration, each valve V1 to V9 of the valve body 31 is controlled based on the electric signal from the electric control panel 32, and each of the preprocessing unit, the continuously variable transmission, the side clutch, and the hydraulic clutch is controlled. The actuator is activated accordingly.

If any operation is defective, the open / close cover 16b is opened, and the valves V1 to V10, the electric control panel 32, and the wiring from the control panel 32 to the valves are inspected and repaired appropriately. It At this time, solenoid valves V1 for continuously variable transmission, solenoid valves V2 for side clutches, solenoid valves V3, V4 for lowering and raising the pretreatment section, which have a relatively high frequency of failure,
The unload valve V5 is installed on the front side and is configured so that it can be manually switched and operated, and can be easily inspected and repaired.

(F) Example Hereinafter, an example according to the present invention will be described with reference to the drawings.

As shown in FIG. 4, the combine C has a machine body 17 supported by crawlers 15. The machine body 17 has an engine 19 mounted on one rear side and a driver seat on one front side. 7 is arranged, and a Glen tank 21 is further installed. In addition, a pretreatment unit 23 is arranged in front of the machine body 17 so as to be able to move up and down.

Then, as shown in detail in FIGS. 1 and 2, the driver's seat 7
The driver's seat frame 24 is fixed on the machine body frame 17a, the step surface 25 is fixed on the front part of the frame 24, and the seat 27 is installed on the rear part via the seat frame 12. ing. Further, a fuel tank 29 is arranged in the driver's seat frame 24, and the seat
27 Valve body 31 on the driver's seat frame 24 below
Is placed and fixed. Further, the periphery of the seat frame 12 is covered with a cover, and the front cover 16 inside the cover is covered.
An electric control panel 32 is fixed and installed in a, and a side cover 16b outside the machine body is configured to be openable and closable. And
The valve body 31 is a block in which a predetermined oil passage is formed.
31a, the block 31a is fixed on the driver's seat frame 24, and further, on the block 31a, a solenoid valve V1 for a continuously variable transmission, a solenoid valve V2 for a side clutch, and a solenoid for lowering a pretreatment section are provided. Valve V3, solenoid valve V4 for lifting, solenoid valve V5 for unloading,
A valve V6 for manually lowering the pretreatment unit, a solenoid valve V7 for a brake, a solenoid valve V8 for a forward hydraulic clutch, a solenoid valve V9 for a reverse hydraulic clutch, a variable relief valve V10 for a clutch petal, and a filter F are provided. In addition, solenoid valve V1 for continuously variable transmission,
Solenoid valve V2 for side clutch, solenoid valves V3, V4 for lowering and raising pretreatment section and unloading valve V
5 is installed near the open / close cover 16b and is configured to be manually switchable.

On the other hand, above the front part of the driver's seat frame 24, as shown in FIGS. 2 and 3, an operation console 11 is erected, and an upper surface of the operation console 11 is an operation panel 9. On the right side of the operation panel 9, the monolever 1 is erected, and various operation switches, meters and display lamps are provided. Monolever 1 only 2 in the left-right direction
The lever 1 itself is moved with respect to the lever box 33 by the movement of the first step to operate the limit switch, and the side clutch solenoid valve V2 is controlled to control the left and right sides. The clutch actuator 20 is actuated, and the second stage of the movement moves the lever box 33 together with the lever 1 to control the variable relief valve 22 to control the braking pressure of the left and right side brakes. (See FIG. 5). On the other hand, the left and right side clutch levers 3 and 5 are rotatably supported in the front-rear direction on the shaft 35 supported in the operation console 11, and the base ends of the levers 3 and 5 are respectively linked to the link mechanism 3.
It is linked to the side clutch / brake in the mission case 39 via 7. Further, the tip ends of the left and right side clutch levers 3 and 5 project from the opening of the operation console 11 toward the driver's seat 7, and further extend upward through the outside of the operator's seat on the operation panel 9, and The grips 3a and 5a are bent and extended inward at positions higher than the grip 1a of the monolever 1.
Are configured. Therefore, the left and right side clutch levers 3,
The grips 5a of the right side clutch lever 5 do not interfere with the visual observation of various meters and display lamps on the operation panel 9 and the operation of various switches, and are widely opened between the grips 3a, 5a of the right side clutch lever 5. Is located so as to cover the monolever 1 when viewed from the front, and the grip portion 5a serves as an armrest when the monolever 1 is operated and also serves as a protective frame for the monolever 1. Further, hooks 13 and 13 forming locking means facing the left and right side clutch levers 3 and 5 are fixed to the side plate on the driver's seat side of the operation console 11 with bolts, and the hook 13 is attached to the side clutch lever 3 and 5. The levers 3, 5 can be used as handles for stabilizing the operator by locking and fixing the levers 5, 5.

On the other hand, as shown in FIGS. 1 and 2, a side operation panel 10 is disposed adjacent to the inside of the body of the driver's seat 7, and the hydraulic lever 2, FR A continuously variable transmission lever 4 and an auxiliary transmission lever 6 are arranged, and further the panel 10
An engine control lever 51 is arranged at the upper front end portion, and a threshing clutch lever 47 and a pretreatment portion clutch lever 49 are arranged side by side on the far side portion of the seat. The hydraulic lever 2, the continuously variable transmission lever 4, and the auxiliary transmission lever 6 are, as shown in detail in FIGS. 1 to 3,
The hydraulic lever 2, the continuously variable transmission lever 4, and the auxiliary transmission lever 6 are arranged in this order from the front of the aircraft with respect to the longitudinal direction of the aircraft, and the auxiliary transmission lever 6, the continuously variable transmission lever 4 and the hydraulic lever are provided in the lateral direction of the aircraft from the driver's seat 7 side. 2 in order, and further, the respective levers are configured such that the sub-transmission lever 6, the continuously variable transmission lever 4, and the hydraulic lever 2 become higher in this order. Furthermore, the second
As shown in detail in the drawing, the hydraulic lever 2 is swingably supported by a pin 52, and a valve body 31 is connected via a link mechanism 54.
It is possible to control the valve V6 for manually lowering the pretreatment unit and the valve V4 for raising the pretreatment unit to vertically control the actuator 23A for the pretreatment unit 23 (see FIG. 5). Further, the F / R continuously variable transmission lever 4 is supported by the pivot support plate 4a by being urged so as to be swingable in the right and left directions and in an upright posture, and the pivot support plate 4a is further attached to the pin 53 via the friction material 58. It is swingably supported in the front-rear direction of the machine body, and therefore can be operated along the crank-shaped guide hole 70 over the forward travel region F, the reverse travel region R and the neutral position N. Further, a potentiometer 56 is interlocked with the pivotal support plate 4a portion of the continuously variable transmission lever 4, and the meter 56 is a continuously variable transmission solenoid valve V1 that operates an actuator 57A for a belt type continuously variable transmission 57, and a mission case. The solenoid valves V8 and V9 that operate the forward and reverse hydraulic multi-plate clutches FA and RA in 39 are controlled (see FIG. 5) to control the shift continuously in the forward and reverse directions, and to adjust the neutral position N. , Both forward and reverse clutches are disengaged, and it is in a neutral state. Further, the sub-transmission lever 6 is pivotally supported by the pin 59 and further interlocked with the sub-transmission gear arm 61 of the transmission case 39 via the link mechanism 60 so that the sub-transmission gear can be switched between high speed and low speed. Further, a pre-treatment portion shift lever 62 is pivotally supported on a pivot pin 59 of the sub-shift lever 6, and the lever 62 is interlocked with a pre-treatment portion shift gear arm 65 of the mission case 39 via a link mechanism 63. Thus, the pre-processing unit transmission gear can be switched. Incidentally, the continuously variable transmission lever 4
The step portion 70a at the neutral position N of the guide hole 70 of the
The hydraulic lever 2 is set in a direction in which the reverse range R and the auxiliary transmission lever 6 are separated from each other.

In FIG. 1, 66 is a vehicle speed memory switch,
The position of the continuously variable transmission lever 4 in the forward travel region F is detected and stored, and the vehicle speed is set to the storage position regardless of the forward travel position of the transmission lever 4 when the vehicle travels forward after turning. Further, 55 is a traveling clutch pedal that also serves as a brake, controls the variable relief valve V10 via the link mechanism 67 (see FIG. 5), drains the hydraulic oil of the left and right side clutches, releases the clutch, and It mechanically connects to the brakes to brake and operate the left and right brakes.

Next, the hydraulic circuit will be described with reference to FIG.

The hydraulic pump P is connected to the flow divider via the filter F.
The flow divider 69 communicates with the high pressure system 70.
And low voltage system 71. The high pressure system 70 includes an unload valve V5, a pretreatment section raising valve V4, a pretreatment section lowering valve V3, a pretreatment section manual lowering valve V6, a side clutch valve V2, and a continuously variable transmission valve. V1 is connected in parallel. The pretreatment section raising valve V4 is used both during manual operation and automatic control by an ultrasonic sensor or the like, but the lowering solenoid valve V3 is used only during automatic control because it performs inching control or the like. In addition, a manual lowering valve V6 is installed for manual operation by the hydraulic lever 2. The side clutch valve V2 is a side clutch actuator consisting of a double-acting cylinder.
20 and operating both cylinders 20a of the actuator 20,
20b is linked to one variable relief valve 22 from a position corresponding to the time of braking operation, and the braking pressure of the left and right brakes is controlled by the throttle amount of the relief valve 22 depending on the tilting angle of the monolever 1. On the other hand, to the low pressure system 71, a reverse hydraulic clutch valve V9, a forward hydraulic clutch valve V8, and a parking brake valve V7 are connected in parallel. The valves V9, V8, and V7 are linked to the reverse hydraulic clutch actuator RA, the forward hydraulic clutch actuator FA, and the parking brake actuator BA, and the low-pressure system oil passage 71 has a clutch petal.
The variable relief valve V10 operated by 55 communicates. In the figure, 29 'is a hydraulic device for the Glen tank 29 and
29A is the actuator for the fried cylinder.

Next, the operation of this embodiment will be described.

When the operator operates the monolever 1 in either the left or right direction during the combine operation, the side clutch solenoid valve V2 is switched, and the side clutch actuator 20 is operated to disconnect one side clutch. Then, when the monolever 1 is tilted further, the throttle amount of the variable relief valve 22 is increased, the actuator 20 is largely moved, and the brake is operated to the braking pressure according to the tilt angle of the lever 1. When the continuously variable transmission lever 4 is tilted to a predetermined position in the forward drive range F, the forward drive clutch valve V6 is first switched to connect the forward drive clutch (FA), and then the signals from the potentiometer 56 and the continuously variable transmission 57 are transmitted. Based on the above, the continuously variable transmission valve V1 is switched to correspond to the position of the lever 4, and the actuator 57A is operated to set the continuously variable transmission 57 at a predetermined gear shift position. When the speed change lever 4 is tilted to the reverse speed range R, the reverse speed clutch valve V9 is switched to connect the reverse speed clutch (RA), and similarly, the continuously variable transmission 57 is moved to the speed change position corresponding to the position of the lever 2. Is set. When the parking brake is set to the operating state, both forward and reverse clutches (FA, RA) are connected, the brake valve V7 is switched, and the actuator BA is activated to brake and activate both left and right side brakes. To do. Furthermore, based on the signal from the cutting height sensor, the valve for lowering the pretreatment section
By controlling V3 or the raising valve V4 to operate the actuator 23A, the pretreatment unit 23 is automatically moved up and down according to the field scene. When the hydraulic lever 2 is tilted in the upward direction, the lifting valve V4 is switched to raise the pretreatment section 23, and when the lever 2 is tilted in the downward direction, the manual lowering valve V6 is switched to perform the pretreatment. Part 23 is rapidly lowered. When controlling the high pressure system 70, the unload valve is controlled at the same time as the control of each valve.
V5 is also switched, and high hydraulic pressure is applied to the high pressure system circuit 70.
Then, when the clutch petal 55 is stepped on, the variable relief valve V10 is relieved according to the pedaling pressure of the petal, and the forward and reverse hydraulic clutch actuators FA and RA to which the hydraulic pressure from the low pressure system 71 is normally supplied are operated. Oil is drained and both clutches are disengaged. At this time, the hydraulic oil is also discharged from the parking brake actuator BA and the brake is released, but the clutch petal 55 and the brake operating rod are connected via a separate wire, and when the petal 55 is stepped on, The brake operates via the wire.

Then, if any of the above operations fails, the operator or the like opens the open / close cover 16b. Then, the electrical wiring to each solenoid valve of the valve body 31, the electric control panel 32, and the valve body is inspected, and a failure point is found,
Replace or repair the faulty part. At this time, the solenoid valve V1 for the continuously variable transmission, the solenoid valve V2 for the side clutch, the pretreatment section lowering and raising solenoid valves V3, V4, and the unload valve V5, which have a relatively high frequency of failure, are
Since it is located on the front side and can be switched even manually, by observing the operation of each device such as the continuously variable transmission while manually switching, the failure point can be easily found and repaired. You can

(G) Effects of the Invention As described above, according to the present invention, the valves V1 to V10 for controlling the hydraulic actuators 57A, 20, 23A, RA, FA, BA and the valve body 31 are configured by concentrating the oil passages. Moreover, since the valve body 31 is installed in the space below the seat 27 in the driver's seat, almost all repairs and inspections can be performed at one place that is easily accessible and easily repaired, and maintenance is possible. In addition, the valve body 31 is normally closed and installed in a place where dust and muddy water are unlikely to enter, and it is possible to prevent a secondary failure due to repair.

In addition, since the valve body 31 is configured by arranging a large number of valves V1 to V10 in the oil passage-formed block 31a, it can be unitized, manufacturing and assembling are facilitated, and even depending on the wide variation of the model. The same type of valve body can be installed, which is extremely advantageous in production. Further, the combine C generally has a thresher on the left side and has a left center of gravity, but since the valve body 31 having the block 31a having an extremely large weight is installed on the driver's seat 7 side,
The valve body 31 serves as a balance weight, and the left-right balance of the machine body can be improved.

Further, since the electric control board 32 for controlling each solenoid valve of the valve body 31 is installed in the space D below the seat, the valve body 31 and the electric control board 32 are brought close to each other to facilitate wiring, and to prevent a failure such as a short circuit or a disconnection. In addition to reducing the number, repairs and inspections can be performed at one location, and maintainability can be further improved. In addition, since the electric control panel 32 and the wiring are also arranged in the clean space D below the seat, it is possible to reduce failures due to intrusion of dust and muddy water into the coupler, and dust and the like can be removed when the control panel 32 is repaired. It is possible to reduce the amount of falling into the oil passage and prevent dust and the like from entering the oil passage due to repair.

[Brief description of drawings]

FIG. 1 is a plan view showing a driver seat of a combine according to the present invention in a partially cutaway view, FIG. 2 is a sectional view as seen from the rear of the seat, FIG. 3 is a side view in which the partially cutaway view, and FIG. It is a side view. FIG. 5 is a hydraulic circuit diagram thereof. 7 ... Driver's seat, 12 ... Seat frame, 23 ... Pretreatment section, 39 ... Mission case, 57 ... Continuously variable transmission, 20,23
A, 57A, RA, FA, BA …… actuator, 24 …… driver frame, 27 …… seat, 31 …… valve body, 31a …… block, V1 to V10 …… valve, C …… work vehicle (combined ), D ... space.

Claims (1)

[Claims] 1. A working vehicle in which each device such as a continuously variable transmission, a side clutch, a pretreatment unit, and a hydraulic clutch is operated by a hydraulic actuator, and a block in which an oil passage for controlling each hydraulic actuator is formed, A valve body composed of the valves for controlling the respective hydraulic actuators arranged on a block, an electric control panel for controlling the valves of the valve body, a step surface at the front part and a seat at the rear part. A driver's seat frame having an upright frame, and a seat installed in the seat frame, the valve body is disposed on the driver's seat frame below the seat, and the electric control is provided in a space below the seat. A hydraulic system in a work vehicle that has a panel.