JPH10291429A - Shift operation device for tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent misoperation in the simplified shift operation of a tractor whereby a main speed shift is performed by a switching operation and a sub- speed shift is done by a manual operation. SOLUTION: Main speed shift switches 3, 4 are provided on the thumb side of the grip 49 of a sub-speed shift lever 5 which is operated in the back and forth direction and the switch button 71 of the main speed shift switch 3 for shifting up and the switch button 72 of the main speed sift switch 4 of shifting down are arranged in parallel along a vertical plane such that they are pressed at the same position. When these buttons 71, 72 are not pressed, the upper button 71 is depressed below an operation plate 50 and the lower button 72 is projected above an operation plane 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor speed change operation device.

[0002]

2. Description of the Related Art Among the tractor traveling speeds, a technology for simplifying a speed change operation by manually operating a sub speed change and operating a main speed change by a switch operation is disclosed. Try to reduce the occurrence of erroneous operations due to computerization.

[0003]

Therefore, the present invention has taken the following technical means. That is, when the sub-transmission lever 5 that operates in the front-rear direction and performs the sub-transmission and the main transmission switches 3 and 4 that perform the main transmission are provided on the thumb side of the grip portion 49 of the sub-transmission lever 5, the up-shift and the down-shift are performed. The switch button 71 of the main speed change switch for shifting and the switch button 72 of the main speed change switch 4 for downshifting are arranged in parallel so as to be pressed at the same position along the vertical plane. When the switch 72 is not pressed, the upper switch button 71 is at a position retracted from the operation surface 50, and the lower switch button 72 is
It is configured to be set so as to protrude from 0.

[0004]

By operating the sub-transmission lever 5 in the front-rear direction, the sub-transmission is switched to a high / low speed range, and the main transmission switches 3 and 4 are pushed with the thumb while the lever 5 is held as it is. It is possible to easily switch to a predetermined gear. In the above-described main speed changeover operation, one of the switch button 71 of the upshift main speed change switch and the switch button 72 of the downshift main speed changeover switch 4 is selected and pushed. However, when they are not pressed, the upper switch button 71 surface is at a position retracted from the operation surface 50 and the lower switch button 72 surface is
Since the setting is made so as to protrude from 0, the shift-up switch button 71 is difficult to press, and the shift-down switch button 72 is in an easy-to-press form. Can be eliminated.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated example, the main part is constituted by main shift switches 3, 4 and an auxiliary shift lever 5, etc., between a cockpit 1 and a left fender 2, for electronically shifting a gear. A shift control box A inside the electronic shift control unit capable of controlling the switching operation between the control and the forward / reverse movement is installed. Between the cockpit 1 and the rear fender 15, the steering angle of the steering handle 6 and the vehicle speed are detected. Full-turn control box B inside electronic full-turn control unit that switches transmission of front wheel 21 at high speed
Is installed between the cockpit 1 and the right fender 7.
A vehicle body 10 having a position setting device 8 and a tillage depth setting device 9
And a hydraulic control box C having communication lines 11 to 14 between the control boxes A and B is installed.

[0006] In such a configuration, when the driver in the cockpit 1 performs a traveling shift, the operator operates the left sub-shift lever 5 and the main shift switches 3 and 4 to shift the shift control box A. Through the electronic shift control unit, shift control is performed in accordance with the shift specification, and control such as forward / backward switching operation and traction control can be performed.

At the time of traveling turning by the steering handle 6, the transmission of the front wheels is switched at a higher speed than the rear wheels through the electronic full-turn control unit in the full-turn control box B by detecting the turning angle and the vehicle speed of the steering handles 6. Can be When performing a tilling operation by attaching a working device such as a tilling device, the ascending position of the tilling device is set by the position setting device 8 of the hydraulic control box C on the right side, and the tilling depth is set by the tilling depth setting device 9. Is set, the elevating control of the tillage device is performed through the electro-hydraulic control unit in the hydraulic control box C, such as the control of the tillage depth.

The switching and setting of the control of each part such as manual and automatic are performed in the right hydraulic control box C, and between the left shift control box A and the rear full turn control box B, etc. Are transmitted and received by the communication lines 11 to 14. The car body 1
0 connects the clutch housing 16, the spacer case 17, the transmission case 18, the rear transmission case 19 and the like from the front engine E to the rear, and a pair of left and right front axle housings 20 at the front of the engine E. The front wheel 21 is steerably provided by the steering handle 6, the rear wheel 23 is mounted on the left and right sides of the rear transmission case 19 by the rear axle housing 22, and the transmission device in the transmission case 18 and the like passes therethrough. The front wheels 21 and the rear wheels 23 can be transmitted. A hydraulic case 24 is provided above the rear transmission case 19,
Lift arm 25 pivoted up and down by a hydraulic cylinder
Is provided.

On the upper part of the vehicle body 10, brackets 2 are provided on the side of the spacer case 17 and the rear axle housing 22.
The frame 28 is mounted and supported via a cushioning material 6, 27, and the like, and the left and right fenders 2, 7,
The rear fender 15, the seat floor 29 connecting these parts, the step floor 30, etc.
0 and the upper part of the rear wheel 23. Reference numeral 31 denotes a column, which is connected in a gate shape over the rear ends of the left and right frames 28, and supports the rear portions of the left and right fenders 2, 7 and the rear fender 15 portion.

On the inner peripheral portions of the fenders 2, 7, 15 surrounding the left, right and rear sides of the cockpit 1, inner covers 33, 34, 35 are provided between the cockpit 1 and the left fenders. A shift control box A is provided between the inner cover 33 and the right fender 7 and the inner cover 34.
, A hydraulic control box C is provided, and a full-turn control box B is provided between the rear fender 15 and the inner cover 35.

A control box having a microcomputer and the like includes, in addition to the shift control box A, the full turn control box B, and the hydraulic control box C, a dashboard 32,
A meter control box D is provided, and the meter control box D is connected to the hydraulic control box C via communication lines 36 and 37 so that transmission and reception can be performed. The meter control unit includes an engine rotation sensor 38 for detecting rotation of the engine E, a wheel rotation sensor 39 for detecting rotation of front and rear wheels, a PTO rotation sensor 40 for detecting rotation of the power take-off shaft PTO, and a high-speed position shift. A high-speed sensor 41 and the like to be detected are input. Further, it outputs a tachometer 42, a buzzer 43, a liquid crystal display 44 and the like.

In the electronic shift control unit of the shift control box A, a check switch 45,
The reverse lever switch 46, the sub-shift position sensor 47 for detecting the sub-shift position, the main shift position sensor 48 for detecting the main shift position, the main shift switches 3 and 4 for raising and lowering the main shift position, and the sub-shift are performed. The main shift which operates the booster valve solenoid 52, the reverse valve solenoid 53 which switches the reverse valve between forward and reverse, and the main shift switchover valve by inputting the sub-shift sensor 51 etc. It outputs a solenoid 54, a shift position monitor 55 for displaying each shift position, and the like.

The electronic full-turn control unit of the full-turn control box B has a full-turn transmission 63 for transmitting the transmission speed of the front wheels 21 about twice as fast as that of the rear wheels 23. By detecting, the full-turn transmission is shifted. In addition, mission case 18
Full-time four-WD clutch 5 provided in the middle of the front wheel transmission shaft interlocked with the front wheel 21 via the internal transmission.
6 can be turned on and off, and this four WD clutch 5
Input shaft rotation sensor 5 for detecting input shaft rotation on the input side of 6
7. Output shaft rotation sensor 5 for detecting output shaft rotation on the output side
8. The turning angle of the steering handle 6 is detected. A work implement lift-up sensor 60 for detecting that the work implement has been raised to a certain height or higher by the handle turning angle sensor 59, the lift arm 25, and a full-time clutch 56 that fixes the full-time clutch 56 A mode changeover switch 61 for switching to a mode, a full turn switch 62 for changing the rotation of the front wheels 21 at a high speed with respect to the rotation of the rear wheels 23, and the like are input.

The electro-hydraulic control unit in the hydraulic control box C includes a PTO lever switch 64 for detecting the input of PTO transmission, a control lever 65 for raising and lowering the lift arm 25, and a lift arm for detecting the amount of lift of the lift arm 25. A sensor 66, a tillage depth setting device (dial) 9 for setting the tillage depth of the tillage device, a depth sensor 68, a draft sensor 69, and other rolling sensors and tilt sensors for controlling the posture of the working device are input. The output section includes the lift arm 25.
A lift valve solenoid 70 of a hydraulic circuit for raising and lowering the hydraulic pressure, a rolling valve solenoid for rolling control, and the like are output.

The main speed change switches 3 and 4 are provided on the thumb side of the grip portion 49 of the sub speed change lever 5, and the operation surface 50 on which the main speed change switches 3 and 4 switch buttons 71 and 72 are provided has an upper end. A switch button 71 of a shift-up main shift switch, which is formed to be inclined so that the lower end is located on the cockpit 1 side and the lower end is located outside, and a shift-down main shift switch The four switch buttons 72 are arranged in parallel so as to be pressed at the same position along the vertical plane, and when these buttons 71, 72 are not pressed, the upper switch button 71 surface is The switch button 72 is set so that the switch button 72 on the lower side is protruded from the operation surface 50.
1 is hard to press, and the downshift switch button 72 is easy to press. When operating the main transmission,
By pressing these switch buttons 71 and 72, upshift or downshift can be performed. When the sub-shift lever 5 is manually operated to perform the sub-shift, the main shift is automatically shifted according to the setting program in the electronic shift control, and the main shift is controlled to maintain the speed closest to the traveling speed immediately before the sub-shift operation. You.

[Brief description of the drawings]

FIG. 1 is a plan view of a tractor cockpit.

FIG. 2 is a left side view thereof.

FIG. 3 is a right side view thereof.

FIG. 4 is a rear view thereof.

FIG. 5 is a partial block diagram thereof.

FIG. 6 is a side view of the auxiliary transmission lever.

FIG. 7 is an enlarged rear view of a part thereof.

FIG. 8 is an enlarged rear view showing the operation.

FIG. 9 is a left side view of the tractor.

[Explanation of symbols]

3, 4 main transmission switch, 5 sub transmission lever, 49 grip part, 50 operation surface, 71, 72 button

Claims (1)

[Claims] 1. A main shift switch (3, 4) for performing a main shift is provided on a thumb side of a grip portion (49) of the auxiliary shift lever (5). The switch button 71 of the main shift switch for upshifting and the switch button 72 of the main shift switch 4 for downshifting are arranged in parallel so as to be pressed at the same position along the vertical plane. Button 71,
When the switch 72 is not pressed, the upper switch button 71 surface is at a position retracted from the operation surface 50, and the lower switch button 72 surface is protruded from the operation surface 50. A tractor speed change operation device, wherein the speed change operation device is set.