JPS6225374Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field The present invention is an invention concerning a gear shift lever device for an agricultural tractor.

(b) Prior Art Conventionally, a technique for shifting a gear by moving a gear shift lever to a position below a steering handle so that it can be rotated in the longitudinal and horizontal directions is a well-known technique.

For example, Publication No. 46-18167, Publication No. 18167,
- As in Publication No. 18754.

(c) Problems to be solved by the invention This invention is configured so that the gear shift lever can be operated by rotation around the steering handle, and by changing the mounting angle of the gear shift lever attached to the gear shift lever shaft, the operator can If you are right-handed, you can operate the gear shift lever with your right hand, and if you are left-handed, you can operate the gear shift lever with your left hand.

(d) Means for solving the problem The purpose of the present invention is as described above. Next, the configuration for achieving the purpose will be explained.

A gear shift lever shaft guide 16 is installed near the steering column 15 of the steering handle 10 and approximately in the center rear thereof, and the gear shift lever shaft guide 16 is inserted through the gear shift lever shaft guide 16 to connect the gear shift lever shaft 17.
, and furthermore, a speed change lever 11 is fixedly attached to the speed change lever shaft 17 so that the speed can be changed by rotating back and forth,
Indicator panel 12 protruding from the speed change lever shaft guide 16 and the speed change lever shaft 17
In a configuration in which an indicator device is provided on the seat side by a slider 31 that is slid by,
The connection between the speed change lever shaft 17 and the speed change lever 11 can be freely changed to project to the right or to the left with respect to the direction of movement of the aircraft.

(E) Embodiment The purpose of the present invention is as described above, and the structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

FIG. 1 is an overall side view of the agricultural tractor.

An engine 2 is disposed within a bonnet 1, and a front axle bracket 3 protrudes from a lower side view of the engine 2. A front axle is provided on a front axle bracket 3 via a center pin, and front wheels 4 are supported at both ends of the front axle. A clutch housing 5 is fixed to the rear surface of the engine 2, and a transmission case 7 is fixed to the rear surface of the clutch housing 5 with a center plate 6 interposed therebetween. The rear wheels 8 are supported by a transmission case 7 or a rear axle housing provided on the side surface of the rear axle case.

A dash board 9 is provided at the rear end of the bonnet 1, and a steering handle 10 is erected on the dash board 9. Further, a gear shift lever shaft 1 is arranged parallel to the periphery of the steering handle 10.
7 is set upright, and a speed change lever 11 is provided to protrude from a speed change lever shaft 17. An indicator panel 12 indicating the gear shift position of the gear shift lever 11 is attached to the center part of the dart board 9 from the seat. A sub-shift lever 13 is a cover for a hydraulic directional control valve.

Fig. 2 is a side view of the steering handle and gear shift lever, Fig. 3 is a partial cross-sectional side view, and Fig. 4 is a plan view of the indicator panel 12.
FIG. 5 is a plan view of the clutch housing 5, center plate 6, and transmission case 7.

The steering handle 10 is inserted through a steering column 15, and has a steering gear box 29 fixedly attached to its lower end. A steering gear box 29 is fixedly mounted on the clutch housing 5.

Mounting stay 27, 2 on steering column 15
8, and a shift lever shaft guide 16 of a shift lever shaft 17 is fixedly installed in parallel with the steering column 15.

Insert and insert the gear shift lever shaft 17 into the gear shift lever shaft guide 16.
A speed change lever 11 is attached to the upper end of the speed change lever shaft 17 in such a manner that an inner diameter spline portion of a base portion 11a of the speed change lever 11 is fitted into an outer diameter spline portion 17a at the top of the speed change lever shaft 17. Gear shift lever shaft 1
Since the outer diameter spline portion 17a on the top of the shift lever 7 is fitted and engaged with the inner diameter spline portion of the gear shift lever base 11a, it is also possible to remove the lock knight 40 and change the spline position from the right side of the normal position to the left side and install the gear shift lever. It is.

However, if the speed change lever is placed on the left side of the steering handle, care must be taken because forward rotation of the speed change lever 11 causes the aircraft to move backward, and backward rotation of the speed change lever 11 causes the aircraft to move forward.

A crank-shaped arm 20 is fixed to the lower end of the speed change lever shaft 17 by welding, and a spring 19 is interposed between the crank-shaped arm 20 and the speed change lever shaft 16.

The spring 19 causes the gear shift lever shaft 1 to
7 is biased downward, and the indicator arm 18 is prevented from falling off by having the middle part of the indicator arm 18 abut against the guide stepped portions 30b, 30c, and 30d of the arm guide 30.

Therefore, when changing gears, it is necessary to lift the gear lever 11 against the spring 19 when shifting from the neutral position to forward or reverse. When changing gears from the forward or reverse position to neutral, the gear lever automatically lowers its position due to the biasing force of the spring 19.

The indicator arm 18 is fixed to the speed change lever shaft 17 by a threaded portion 18a at its base.

A crank-shaped arm 20 at the lower end of the speed change lever shaft 17 is interlocked with arms 26 and 39 which operate a hydraulic directional control valve 21 at ball joints 23 and 25 and a turnbuckle 24.

The hydraulic directional control valve 21 is placed and fixed on the upper surface of the mission case 7, and connects and disconnects pressure oil to the hydraulic crank device inside the mission case to operate the three forward stages,
Shift to 1st reverse gear.

FIG. 4 is a plan view of the indicator panel 12, in which the steering column 1 is inserted into the large diameter hole 12a.
5 is fitted into the small diameter hole 12b, and the gear shift lever shaft 17 is fitted into the small diameter hole 12b. The indicator panel 12 is attached to the upper surface of the dash board 9.

6 is a plan view of the steering handle 10 and gear shift lever 11, FIG. 7 is a plan view of the arm guide 30 of the indicator arm 18, FIG. 8 is a rear view of the arm guide 30, and FIG. 9 is a plan view of the indicator panel 12. 10 is a plan view of the speed change display plate 32 of the indicator panel 12, FIG. 11 is a side sectional view of the indicator panel 12, and FIG. 12 is a back view of the indicator panel 12.

As mentioned above, the indicator arm 18 is screwed onto the gear shift lever shaft 17, and the engagement fork 31 of the slider 31 is attached to the spherical lever at the tip of the indicator arm 18.
a is engaged. Since the engagement fork 31 is forcibly moved left and right by the rotation of the gear shift lever 11, the slider 31 is moved by the gear shift display plate 32 shown in FIGS. 9 and 10.
It reciprocates from side to side on the back side.

The front surface of the speed change display plate 32 is painted black,
Only the five grooves 32a that indicate the gear shift position are transparent. Only the protrusion 31b on the top surface of the slider 31 is coated with red fluorescent coating.
When the gear shift position is reached, this protrusion 31b connects to the groove 32b.
It will come to a position where you can see it and display the gear shift position. 3
Reference numeral 8 denotes a back plate that holds the slider 31 between it and the speed change display plate 32. A square elongated hole 38a is opened in the center of the back plate 38, through which the engaging fork 31a can move laterally. As shown in FIGS. 7 and 8, the arm guide 30 is configured in a fan shape that expands rearward, and guide steps 30b, 30 are formed at the tip of the fan shape.
c, 30d are provided. The lowest portion 30c of the guide step is a neutral position, and a forward step 30b is provided on the right side in the forward direction, and a reverse step 30d is provided on the left side.

A difference in height H is provided between the step 30d for backward movement and the step 30b for forward movement, so that the vehicle will not move backward unless the operator intentionally climbs over this height H.

(f) Effects of the invention Since the invention is constructed as described above, it has the following effects.

First, since the shift lever shaft guide 16 and the shift lever shaft 17 are provided at the rear of the steering column 15 at the center of the left and right sides of the aircraft, it is possible to place the shift lever 11 protruding to either the left or right side. It is.

Second, the transmission lever shaft 17 and the transmission lever 11 are connected by spline fitting, and the installation position of the transmission lever can be freely protruded to the right or left with respect to the direction of movement of the aircraft, so right-handed people can install it on the right side. Left-handed people can adjust the shift lever to the left, and even right-handed people can adjust the shift lever to the left or right depending on their preferred arm.

Thirdly, since the protruding position can be adjusted by spline fitting, the rotation operation range of the gear shift lever 11 can be adjusted back and forth, and even after the seat position has been fully adjusted back and forth, When it is necessary to adjust the front and rear positions, shift lever 1
This can be done by adjusting the spline fitting position.

Fourthly, even when the rotational operation position of the gear shift lever 11 is changed from side to side or front to back, the indicator device does not follow the change in the position of the gear shift lever 11 and remains at a constant position in front of the operator. So,
When changing the speed change lever 11, there is no need to move the indicator at the same time, so adjustment can be made simply by changing the fitting position of the spline.

Furthermore, since the forward and reverse positions are determined on the assumption that the shift lever 11 is on the right side, if the shift lever 11 is changed to the left side, the rotating direction of the shift lever 11 and the forward and reverse directions are determined. However, the indicator device will display the same information in either case, so the operator does not have to reverse the indicator device and will not be able to move forward or
Reversing is the opposite, but you can definitely operate it by looking at the indicator device.

[Brief explanation of the drawing]

Figure 1 is an overall side view of the agricultural tractor, Figure 2 is a side view of the steering handle and gear shift lever, Figure 3 is a partial sectional view of the same side, Figure 4 is a plan view of the indicator panel 12, and Figure 5 is a side view of the agricultural tractor. The figure is a plan view of the clutch housing 5, center plate 6, and transmission case 7, FIG. 6 is a plan view of the steering handle 10 and gear shift lever 11, and FIG. 7 is a plan view of the arm guide 30 of the indicator arm 18. Figure 8 shows the arm guide 30
9 is a rear sectional view of the indicator panel 12, FIG. 10 is a plan view of the speed change display plate 32 of the indicator panel 12, and FIG. 11 is a side sectional view of the indicator panel 12.
The figure is also a back view of the indicator panel 12. DESCRIPTION OF SYMBOLS 10...Steering handle, 11...Shift lever, 11a...Shift lever base, 15...Steering column, 16...Shift lever shaft guide, 17...Shift lever shaft, 17a...
...Outer diameter spline part.

Claims (1)

[Scope of utility model registration request] A gear shift lever shaft guide 16 is installed near the steering column 15 of the steering handle 10 and approximately in the center rear thereof, and the gear shift lever shaft guide 16 is inserted through the gear shift lever shaft guide 16 to connect the gear shift lever shaft 17.
, and furthermore, a speed change lever 11 is fixedly attached to the speed change lever shaft 17 so that the speed can be changed by rotating back and forth,
Indicator panel 12 protruding from the speed change lever shaft guide 16 and the speed change lever shaft 17
In a configuration in which an indicator device is provided on the seat side by a slider 31 that is slid by,
A speed change lever device for an agricultural tractor, characterized in that the connection between a speed change lever shaft 17 and a speed change lever 11 can be freely changed to project to the right or to the left with respect to the direction of movement of the machine body.