JPH08108761A - Device for checking speed change operation - Google Patents

Abstract

PURPOSE: To enable a first speed change part as auxiliary speed change to be neutralized and an engine to be started for restraining a first speed change part from having high speed even when a second speed change part of creep speed change is turned on. CONSTITUTION: A lever support shaft 16 of a first speed change lever 14 is provided with a checking means 26 and a second speed change lever 15 is provided through a second lever support shaft 21 with a checked means 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check device for gear shift operation, and is used for traveling system missions such as tractors.

[0002]

2. Description of the Related Art A tractor traveling system mission incorporates a main shift 4 speed, a first auxiliary shift 2 speed, a second auxiliary shift 2 speed, and a creep shift in order to meet the needs of agricultural work sophistication and compounding. For the creep shift, the creep shift is turned on only at the low speed of the second auxiliary shift, and the safety switch is set to the second shift.
The engine can be started at the neutral position of the auxiliary gear shift.

[0003]

If the engine is started while the creep shift is turned on, the creep shift must be turned off and the shift lever for the second auxiliary shift must be made neutral, which is a troublesome operation. In addition, the gear shift lever extends through the floor of the cabin that is suspended independently from the mission case, which is essentially the vehicle body. Since the vehicle body and the cabin have different vibration frequencies, the gear shift lever operation is heavy. There was a problem of becoming.

In view of this, the present invention operates by making it possible to return the second auxiliary shift (first shift unit) to the neutral state even when the creep shift (second shift unit) is in the ON state, and by controlling the switching at high speed. The first purpose is to improve the property.
A second object of the present invention is to enable the gear shift lever to be operated lightly by absorbing the abnormal vibration even if the cabin and the vehicle body vibrate (swing).

[0005]

According to the present invention, the first transmission section 6 is provided.
Is provided with a first speed change lever 14 for switching the high speed position H, the neutral position N, and the low speed position L to turn on the second speed change portion 7.
In the gear shift operating device including the second gear shift lever 15 that is turned off, the following technical measures are taken to achieve the above-described first object.

That is, according to the first aspect of the present invention, when the second shift lever 15 is turned on, the first shift lever 15 is turned on.
The gear shift lever 14 is provided with a restraining device 26 and a restrained device 27 that can shift the shift lever 14 between the neutral position N and the low speed position L but cannot shift the high speed position H. Further, the first speed change lever 14 is provided on one side of the driver's seat 12, and the second speed change lever 15 is provided on the other side of the driver's seat 12, and the lever support shaft 16 of the first speed change lever 14 is provided. Is provided so as to penetrate the mission case 2, a check tool 26 is provided at the inserted end of the lever support shaft 16, and the interlocking arm 24 of the second speed change lever 15 is provided with the check target tool 27.
Can be

Further, the present invention takes the following technical means in order to achieve the above-mentioned second object. That is,
A cabin 8 having a driver's seat 12 is independently suspended on a mission case 2 which is a vehicle body 1, and the first and second speed change levers 14 and 15 are arranged on the cabin 8 from the mission case 2.
Are disposed on both sides of the driver's seat 12 by inserting the vibration absorbing means 28 at the insertion portion of the cabin 8 of the first and second speed change levers 14 and 15.

[0008]

The first speed change lever 14 remains in the neutral position N even when the second speed change lever 7 is turned on by operating the second speed change lever 15.
Therefore, the engine can be started and the first shift lever 14 is set to the high speed position H by the restraint 26 and the restrained 27.

Further, even if the vehicle body 1 and the cabin 8 independently suspended on the vehicle body 1 vibrate differently, the first and second speed change levers 14 and 15 are vibrated by the vibration absorbing means 28.
It does not hinder the operation of 5.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. Referring to FIG. 4 showing a tractor with a cabin, a wet case main clutch electronic shuttle 3, a main shift unit 4 capable of four-speed gear shifting by a power shift, and a sub-stage capable of two-speed gear shifting are provided in a mission case 2 which is a vehicle body 1. The first transmission unit 5 and the sub-second transmission unit (hereinafter referred to as the first transmission unit) capable of shifting to high speed, neutral and low speed positions.
A traveling system mission is constituted by a gear shift portion 6), a creep gear shift portion (hereinafter referred to as a second gear shift portion) 7 that can be switched on and off, a diff and the like.

On the vehicle body 1, a cabin 8 is independently suspended by a vibration-proof rubber support or the like (not shown).
The left and right rear wheel fenders 9 are connected by a floor seat 10, the steering wheel 11 and the driver's seat 12 are surrounded, and a pair of left and right doors 13 are provided. A first speed change lever 14 is provided on one side of the driver's seat 12, that is, on the right side in the embodiment, and a second speed change lever 15 is provided on the other side thereof. Both levers 14 and 15 are both floor seats of the cabin 8. 10 are inserted.

In the first embodiment shown in FIG. 1, a first lever support shaft 16 is provided by penetrating the mission case 2, and an interlocking arm 17 is fixed to one end (right side) of the lever support shaft 16. The first transmission unit 6 is provided in the middle of the lever support shaft 16.
Is provided with a shift fork 19 for switching the shifter 18 to a high speed position H, a neutral position N and a low speed position L, and the lower end of the first speed change lever 14 is pivotally attached to the interlocking arm 17 by a pin 20.

A second lever support shaft 21 having a short shaft structure is rotatably provided on the left side of the transmission case 2 in the middle of its height direction. The lever support shaft 21 is provided with a shifter 22 of the second transmission section 7. A shift fork 23 that turns on and off is provided, and an interlocking arm 24 having an L-shape in side view is fixed to the shaft end of the lever support shaft 21.
The lower end of the second gearshift lever 15 has a pin 25 on the arm 24A.
And the second arm 24B is extended upward so that its extended end is located near the first lever support shaft 16.

The shifter 22 is turned on and off by moving the second speed change lever 15 up and down to swing the interlocking arm 24 around the second lever support shaft 21, but when the shifter 22 is in the on position, the first lever support shaft 21 is turned on and off. The plate-like restraining device 26 fixed to the shaft end of the shaft 16 can be switched between the neutral position N and the low speed position L by the second arm 24B of the interlocking arm 24, but cannot be switched at the high speed position H so that it cannot be switched. And here, the second arm 2
4B is a restrained device 27.

The first and second speed change levers 14 and 15 both penetrate the floor sheet 10 of the cabin 8, and the second speed change lever 15 is shown as a representative in the inserted portion. The gap is formed between the lever 15 and the lever 15 to form the vibration absorbing means 28, and the bellows 29 close the gap. FIG. 2 shows another embodiment of the vibration absorbing means 28, in which the vibration absorbing means 28 is constituted by a ball seat rotating body.

Incidentally, it is desirable that the middle of the second shift lever 15 can be joined and separated by a screw structure 30, and the vibration absorbing means 28 can also be provided in the first shift lever 14 and the like. FIG. 3 shows another embodiment of the restraint means according to the present invention, in which the restraint tool 26 is extended downwardly and a restraint pin 26A is provided at the extension end thereof, and the second arm 24B of the interlocking arm 24 has a substantially L-shape. It is formed on the restrained device 27 having a window (hole) structure, and the restraining pin 26 is attached to the restrained device 27.
A is engaged, and its basic operation is the first described above.
Since it is common to the embodiment, common parts are indicated by common reference numerals.

In each of the above-described embodiments, the safety switch can start the engine at the N position of the first speed change lever 14.

[0018]

As described above in detail, even when the second transmission portion is on, the first transmission portion can be in the neutral position and the engine can be started, and the first shift lever can be restrained from being in the high speed position.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of the present invention.

FIG. 2 is a side view showing a second embodiment of the present invention.

FIG. 3 is a side view showing a third embodiment of the present invention.

FIG. 4 is a side view of a tractor with a cabin.

[Explanation of symbols]

 1 Vehicle Body 2 Mission Case 6 1st Speed Change Part 7 2nd Speed Change Part 8 Cabin 14 1st Speed Change Lever 15 2nd Speed Change Lever 26 Checking Tool 27 Checked Tool

Claims (3)

[Claims] 1. A first operation for switching a first transmission section (6) to a high speed position (H), a neutral position (N) and a low speed position (L).
It is equipped with a speed change lever (14) to turn on the second speed change section (7).
A gear shift operation device having a second gear shift lever (15) for turning off, wherein when the second gear shift lever (15) is turned on, the first gear shift lever (14) is moved to a neutral position (N) and a low speed position. A restraint device for gear shift operation, wherein (L) is provided with a restraining device (26) and a restrained device (27) capable of shifting gears at the high speed position (H) and not capable of shifting at a high speed position (H). 2. The first shift lever (14) is provided with a driver seat (1
2) is provided on one side and the second shift lever (15) is provided on the other side of the driver's seat (12), and the lever support shaft (16) of the first shift lever (14) is used for the mission. It is provided so as to be inserted through the case (2), the checker tool (26) is provided at the inserting end portion of the lever support shaft (16), and the interlocking arm (24) of the second speed change lever (15) is provided with the check target tool (27). ) The check device for shifting operation according to claim 1, wherein: 3. A cabin (8) having a driver's seat (12) is independently suspended on a mission case (2) which is a vehicle body (1), and first and second speed change levers (14) (1).
5) is the cabin (8) from the mission case (2)
Is arranged on both sides of the driver's seat (12), and a vibration absorbing means (28) is provided at the insertion portion of the cabin (8) of the first and second speed change levers (14) and (15). The check device for gear shift operation according to claim 2, wherein