JPH08228507A - Backup restriction apparatus of tractor working machine - Google Patents

Abstract

PURPOSE: To improve the safety of a tractor by restricting the lifting of a lift arm of a tractor at the high-speed backing mode. CONSTITUTION: This backup restriction apparatus of a tractor working machine is composed of a backup apparatus 3 to lift a lift arm 2 at the backing position R of a main speed change lever 1 and a restriction apparatus attached to the backup apparatus 3 to allow the lifting of the lift arm 2 by the backup apparatus at the low-speed position of an auxiliary speed change lever and inhibit the lifting motion at a high-speed position of the lever.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backup check device for checking the backup of a tractor working machine.

[0002]

2. Description of the Related Art In tractor work, there is a backup device at the rear part of a vehicle body for raising a connected working machine to a non-working position by switching to a reverse position during work. Even in the case, if the main transmission lever is moved to the reverse position, the working machine may be suddenly raised and it may be dangerous.

[0003]

According to the present invention, a backup device 3 for moving a lift arm 2 upward by operating a reverse position R of a main transmission lever 1 and a backup device 3 for a low speed position L of an auxiliary transmission lever 4 are provided. The lift arm 2 is moved upward, but at the high speed position H, the check device 5 is provided so that it does not move upward.

[0004]

[Operation and Effect of the Invention] The auxiliary transmission lever 4 is set to the low speed position L.
Thus, the work can be performed by the working machine while transmitting the traveling power by the shift operation of the main shift lever 1. At this time, when the main transmission lever 1 is operated to the reverse position R, the lift arm 2 is raised by the backup device 3 in conjunction with the operation of the main transmission lever 1, and the working machine is raised.

When the auxiliary transmission lever 4 is in the high speed position H, even if the main transmission lever 1 is in the reverse position, the lift arm 2 is not raised by the restraining position 5 and the working machine is raised more than the present. Not done. As described above, the sub gear shift lever 4 is set to the low speed position L to raise the work implement by the backward movement only when the work implement is in a working state, and the sub gear shift is set to the high speed position H to prevent the lift-up. Therefore, safe operation and work can be performed. The operation is also easy.

[0006]

[Example] The tractor body 6 is a steering wheel 7
Has a front wheel 8 and a rear wheel 9 which can be operated by the above-mentioned operation, and is driven from inside the clutch housing 11 via a transmission mechanism inside the front and rear transmission cases 12 and 13 by an engine 10 mounted on the front portion. It is a four-wheel drive mode of traveling by A hydraulic case 14 is provided above the mission case 13, and the lift arm 2 is rotated up and down by expansion and contraction of the hydraulic cylinder, and work is performed on a rotary cultivator or the like connected via a three-point link mechanism including a lower link and a top link. The machine can be raised and lowered. A pilot seat 15 is provided between the fenders 16, a lift lever (position lever) 17 is provided on the right hand side fender 16, and a main shift lever 1 and a sub shift lever 4 are provided on the left hand side fender 16.
Etc.

The main transmission lever 1 shifts the main transmission in the transmission case 12 to shift the traveling speed.
Guided by the H-shaped shift guide 18 formed on the fender 16, the forward first speed F1 to the third speed F3, and the reverse position R
Each shift can be performed. The sub speed change lever 4 is
The lever shaft 19 is rotated to switch the auxiliary transmission gear in the transmission case 12 between the shift position H and the low speed position L to shift gears.

The backup device 3 is located between the main shift lever 1 and the sub shift lever 4 and the position arm 20 of the position control valve operated by the lift lever 17, and the sub shift lever 4 is at the high speed position H.
In the state of being shifted to, the stopper rod 21 locks the swing of the swing arm 22 and restrains the switching operation in the raising direction of the position arm 20 which is interlocked via the swing arm 22 and the rod 23. Then, the lift arm 2 is prevented from being raised by the position control valve.

The swing arm 22 is used for the main shift lever 1
It is interlocked with the operation of, and can be swung around the swing pin 25 by being engaged by the pin 24 of the main shift lever 1. The swing arm 22 is used for the mission case 12
Arc-shaped long hole 2 with respect to the plate 26 attached to
The rocking pin 25 is fitted to 7. Further, a pin 28 is also provided at the lower end of the swing arm 22 so that the arc-shaped elongated hole 2 is formed.
9, and the swing arm 22 includes the upper and lower pins 25,
28 is fitted and guided in the long holes 27 and 29, and can swing back and forth.

The stopper rod 21 is vertically slidably guided to the opposite side of the plate 26, and the tip portion of the auxiliary transmission lever 4 is connected to the pin 30 of the stopper rod 21.
The stopper rod 21 can be moved up and down by the shift of the auxiliary transmission lever 4 to lock the swing of the pin 25 or the pin 28. That is, when the pin 25 is stopped at the upper end of the stopper rod 21 (FIG. 2), the swing arm 22 is swung around the pin 25, and the pin 28 is stopped at the lower end of the stopper rod 21. When swung (FIG. 3), the swing arm 22 is swung about the pin 28.

Therefore, when the auxiliary transmission lever 4 is shifted to the high speed position H, the stopper rod 21 moves downward,
As described above, the pin 28 of the swing arm L22 is locked, and the pin 25 side of the upper end is swingable, and the swing can be performed by operating the reverse position R of the main shift lever 1. The rod 23 connected to the side is not interlocked, and therefore the arm 20 of the control valve is also not rotated. Conversely, when the pin 25 on the upper side of the swing arm 22 is locked (FIG. 2), the main shift lever 1 is swung by the backward movement position R operation,
The rod 23 connected to the lower end is swung back and forth, and the arm 20 of the control valve acts to raise the lift arm 2.

The lift lever 17 has a hydraulic case 14
A lever shaft 31 is provided on a side portion of the position lever rotatably in the front-rear direction.
0 is rotated to control the switching of the control valve in the hydraulic circuit to operate the hydraulic cylinder to move the lift arm 2 up and down. The long hole 32 of the rod 23 on the swing arm 22 is pin-engaged with one end of the position arm 20, and the position arm 20 can be rotated by moving the rod 23 in the front-rear direction.

The position arm 20 has a spring 33.
, The position arm 20 is rotated by the rod 23 against the spring 33.
The position arm 20 is formed in an inverted V shape in a side view, and a central portion of the position arm 20 is rotatably attached to a bracket 35 attached to the hydraulic case 14 by a control valve interlocking pin 34.

Lift lever 17 and the position arm 2
An interlocking plate 36 is provided between the interlocking plate 36 and the spring 0, and an arm 38 integral with the lift lever 17 is engaged with an edge 37 of the front end portion of the interlocking plate 36, so that the interlocking plate 36 becomes a spring 42. It can be rotated around the plate shaft 39. Also, this interlocking plate 36
Is formed with an arc-shaped elongated hole 41 for fitting and guiding the tip end 40 of the position arm 20. The tip end 40 of the position arm 20 includes the elongated hole 41 and the rod 23.
It is fitted in the long hole 32. Reference numeral 42 denotes a spring, which causes the interlocking plate 36 to spring toward the position arm 20. Further, the lower end portion 4 of the lift lever 17 is attached to the tip end portion 43 of the position arm 20 on the side having the spring 33.
4 is engaged from the upper side, and by rotating the lift lever 17 to the raising side, the position arm 20 is engaged and rotated.

Reference numeral 45 denotes a bracket, which is the hydraulic case 14
The lift lever 17 is pivotally supported by the lever shaft 31, and the long hole 46 of the lift lever 17 is fitted to the pin 47 to regulate the rotation angle. Further, it has a plate shaft 39 of the interlocking plate 36. When the lift lever 17 is operated to the lowered position (FIG. 4), the tip end portion 40 of the position arm 20 is moved rearward, and the tip end portion 43 locked to the lower end portion 44 is moved backward by the spring 33. Is engaged with the rear end of the slot 32 because it is pulled to the rod 2
3 is pulled rearward, whereby the swing arm 22 is also rotated so that the pin 28 at the lower end is located at the rear end of the elongated hole 29. At the same time, the tip end portion 40 of the position arm 20 engages with the rear end of the elongated hole 41 of the plate 36 so as not to rotate further rearward.

Further, the lift lever 17 is raised to a position (FIG. 5).
When operated to, the tip portion 43 of the position arm 20
Is rotated forward by the lower end portion 44 against the spring 33, so that the distal end portion 40 is guided by the elongated hole 32 of the rod 23 and the elongated hole 41 of the plate 36 and rotated forward. A front end portion 48 of the long hole 41 is slightly bent downward to hold the tip end portion 40 of the position arm 20 engaged with the long hole 41 and maintain the control valve in the raised position.

In FIGS. 4 to 6 and 8, in the backup device 3 as described above, the engine 10 can be started when the lift lever 17 is in the lowered position and the safety switch 55 is ON. It is configured to be. The engine 10 can be started by turning on the main switch 57 only when the lift lever 17 is in the lowered position, and it is safe that the working machine does not suddenly rise when the engine is started. Further, in the circuit of FIG. 8, the safety switch 56 is also provided on the clutch so that the engine 10 cannot be started unless the clutch is stepped on even when the lift lever 17 is in the lowered position. 58 is a starter
59 is a battery.

In FIG. 9, the point different from the above example is that when the engine 10 is stopped, the A check arm 60 stopped by the motor M cannot shift the main transmission lever 1 to the reverse position R. The lift arm 2 is prevented from rising when the engine is started to ensure safety. While the engine 10 is being driven, the restraint arm 60 is rotated by the motor M and is in the restraint release position B. 10, the difference from the above example is that the check arm 60 is
Instead of the control rod 61, the restraint rod 61 is replaced by a shifter 62 of the main transmission.
The spring 64 of the hydraulic cylinder 63 causes the spring 64 to project so as to prevent the shift to the reverse position R. This hydraulic cylinder 63
The oil is supplied from the hydraulic pump P to retract the check rod 61 against the spring 64, whereby the shifter 62 can be shifted to the reverse position R. Reference numeral 65 is a main transmission gear, and 66 is a shifter stay. When the engine 10 is stopped, the driving of the hydraulic pump P is stopped, and the restraining rod 61 is automatically projected by the spring 64, and the shifter 62 is
The reverse position R of the vehicle is restrained. Further, when the engine 10 is started, the hydraulic pump P is also driven, and therefore the check rod 61 is pushed against the spring 64 by the hydraulic pressure, and the reverse position operation of the main transmission lever 1 is performed to release the check. The shifter 62 can shift the main transmission gear 65 to the reverse position.

[Brief description of drawings]

FIG. 1 is a side view of a main shift lever portion.

FIG. 2 is a side view of an auxiliary shift lever portion.

FIG. 3 is a side view showing a part of the operation thereof.

FIG. 4 is a side view of a lift lever portion.

FIG. 5 is a side view showing the operation.

FIG. 6 is a rear view thereof.

FIG. 7 is a side view of the tractor.

FIG. 8 is a block circuit diagram of an engine starter.

FIG. 9 is a side view of a main shift lever portion showing another embodiment.

FIG. 10 is a side view of a main transmission unit showing a partially different embodiment.

[Explanation of symbols] 1 main gear shift lever 2 lift arm 3 backup device 4 auxiliary gear shift lever 5 restraining device R reverse position L low speed position H high speed position

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nozomu Katagami 1 Hachikura, Tobe-cho, Iyo-gun, Ehime Izeki Agricultural Machinery Co., Ltd. In the Engineering Department (72) Inventor Matsuhiko Tsunekawa, No. 1 Yakura, Tobe Town, Iyo-gun, Ehime Prefecture

Claims (1)

[Claims] 1. A backup device 3 for moving a lift arm 2 upward by operating a reverse position R of a main gear shift lever 1, and an upward motion of the lift arm 2 by the backup device 3 at a low speed position L of a sub gear shift lever 4. A backup restraint device for a tractor working machine, which is provided with a restraint device 5 that does not perform the upward movement at the high speed position H.