JP2543110B2 - Height adjustment device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vehicle height adjusting device for changing a ground clearance of a vehicle body in a vehicle.

(B) Conventional Technology Conventionally, in order to change the minimum ground clearance of a vehicle, a technology for vertically adjusting the positions of the steering axle and the drive axle with respect to the body has been known.

For example, JP-A-59-202938 and JP-A-60-1522.
No. 4, gazette 58-111626 gazette, gazette 61-169 gazette
This is the same as the technique described in Japanese Patent Publication No. 627 and Japanese Patent Laid-Open No. 56-112326.

However, in the prior art, a device for adjusting the vertical position of the steering axle is used by rotating a bevel gear box with a kingpin inside with respect to the front axle case, or a final axle rotatably attached to the bevel gear box. Since it was done at one place either between the case and the case, there were the following problems.

That is, with respect to the kingpin supported on the body side of the vehicle,
Since the final axle case is rotated to change the position,
A camper formed between the kingpin and the steering wheel
The steering wheel alignment of casters, toes, etc. may change. If this alignment changes, the straightness and operability of the aircraft will deteriorate.

In order to prevent the steering wheel alignment from changing, it is necessary to fix the position of the steering axle at the position where the final axle case is rotated 180 degrees up and down.

Conversely speaking, when the position of the steering axle is stopped halfway at the position of the midway angle, the alignment changes and the straightness and the steering operability are adversely affected.

(C) Problems to be Solved by the Invention Because of the above-described problems, in the conventional vehicle height adjusting device, the position of the steering axle is rotated by 180 degrees.
Only the position was able to be taken, and either the normal position or the height of the vehicle could be adjusted.

As an operator, it is desirable to be able to work over ridges when the vehicle height is high, to work in paddy fields when the vehicle height is normal, and to work under the branches of an orchard when the vehicle height is low. In reality, they could only take the normal position and either the low position or the high position.

According to the present invention, the position of the steering axle can be adjusted at high, normal, low and up and down at three or more positions.
The steering wheel alignment does not change even if the steering wheel is located at more than one position.

(D) Means for Solving the Problems The object of the present invention is as described above, and a configuration for achieving the object will be described below.

Front axle cases 5 and 5 are provided extending left and right from the front differential gear device.
By rotating the vehicle height adjusting case 4 up and down by 180 degrees at both ends of 5, 5, a kingpin front stage adjusting portion of two upper and lower stages is formed, and the turning side bevel gear box 7 is attached to the vehicle height adjusting case 4. By fixing, the king pin 3 is pivotally supported on the rotating side bevel gear box 7, and the final axle case 9 pivotally supporting the steering axle A is rotated up and down by 180 degrees on the rotating side bevel gear box 7. Comprising two upper and lower kingpin rear adjusting parts, a kingpin front adjusting part and a kingpin rear adjusting part are separately arranged before and after the kingpin 3, and three or more vertical adjusting stages of the steering axle A are provided. Is.

(E) Embodiment The object and structure of the present invention are as described above, and the structure of the embodiment shown in the accompanying drawings will be described below.

Fig. 1 is an overall side view of a tractor with a vehicle height adjusting device, Fig. 2 is a front sectional view of a kingpin front stage adjusting part in a low position, and a kingpin rear stage adjusting part is in a high state, and Fig. 3 is a kingpin front stage adjusting part. 4 is a front sectional view showing a state in which the lower part of the kingpin and the rear adjusting part of the kingpin are low, and FIG.

 The overall structure will be described with reference to FIG.

In the drawing, a tractor is disclosed as a vehicle, and in this embodiment, the front wheels are steering wheels 11 and the rear wheels are driving wheels 12.

However, the steering wheels 11 may be rear wheels and the driving wheels 12 may be front wheels.

The vehicle height adjusting device of the present invention is arranged in the steering wheel 11 of such wheels.

And, in the portion of the drive wheel 12 that does not perform steering rotation,
Since it is not necessary to provide alignment such as campers, casters, and toes, it is possible to stop at this portion even while the rear wheel final axle case is rotating around the rear wheel height adjustment center axis C. At three positions on the turning path of the vehicle height adjusting central shaft C, three high, normal, and low vehicle height positions are formed by the positions D1, D2, D3 of the drive axle D.

On the other hand, in the case of the steering axle A, in order to prevent the alignment angle of the camper / caster / toe-in from changing, the final pin that rotates around the vehicle height adjustment central axis B that constitutes the kingpin rear-stage adjustment unit is used. Axle case 9
It can be fixed only in the position rotated up and down 180 degrees.

Then, in the kingpin pre-stage adjusting section configured in the front part of the kingpin 3, it is possible to separately adjust the upper and lower two stages, and actually obtain the adjusting positions of the four high and low stages of the steering axle A,
The three stages are "A1", "A2 or A3", and "A4", which are the high, normal, and low vehicle height adjustment positions.

 Next, a description will be given with reference to FIGS. 2 to 4.

FIG. 2 is a front cross-sectional view in the vicinity of the bevel gear box in a configuration in which power can be transmitted to the front wheels that are the steering axle A to be driven.

Front axle cases 5 and 5 are provided extending left and right from the front differential gear device.
Vehicle height adjustment cases 4 are attached to both ends of 5, 5 so that their positions can be adjusted.

Then, by rotating the vehicle height adjusting case 4 up and down 180 degrees between the front axle cases 5 and 5 and the vehicle height adjusting case 4, a kingpin front stage adjusting portion is configured.

In FIG. 2, centering on the front axle shaft 1,
The vehicle height adjustment case 4 is rotated upward and is in the low position.
The figure shows a high position in which the vehicle height adjusting case 4 is rotated downward around the front axle shaft 1.

Next, the gear 13 on the front axle shaft 1 meshes with the gear 14 on the counter shaft 2, and the counter shaft 2 is rotated.

Next, the end of the counter shaft 2 is inserted into the fixed-side bevel gear box 6, and the bevel gear 15 is fixedly installed at the end. The bevel gear 15 meshes with a bevel gear 16 on the upper end of the king pin 3, and the lower end of the king pin 3 is supported by a bearing in the rotating side bevel gear box 7.

And the bevel gear fixed to the lower end of the king pin 3
17 engages with a bevel gear 18, which is fixed to a portion of the vehicle height adjusting central shaft B in the final axle case 9 that protrudes into the rotating side bevel gear box 7.

The final axle case 9 is fitted into a rotation guide plate 10 fixed to the rotation-side bevel gear box 7, and the final axle case 9 rotates in a circular groove of the rotation guide plate 10 to rotate the final axle case 9 to the rear stage of the kingpin. It constitutes the adjustment part.

The gear 19 on the other end of the vehicle height adjusting center shaft B and the gear on the steering axle A supported by bearings on the other end of the final axle case 9
20 is meshed with. Steering wheels 11 are fixed to the steering axle A.

The rotating side bevel gear box 7 has a knuckle arm base 8
By rotating the knuckle arm base 8 around the kingpin 3, the turning-side bevel gear box 7, the final axle case 9, and the steering wheels 11 perform steering rotation about the kingpin 3. It is possible.

FIG. 2 shows the steering axle A in the low position, and FIG. 3 shows the steering axle A in the high position.

The adjustment height by the kingpin front-stage adjustment section is twice the axial center distance H1 between the front axle shaft 1 and the counter shaft 2.

The vehicle height adjustment width of the kingpin rear adjustment unit is twice the axial center distance H2 between the vehicle height adjustment central axis B and the steering axle A.

Axial distance, which is the adjustment width in the kingpin front stage adjustment part
When H1 and the axial distance H2, which is the adjustment width in the kingpin rear adjusting unit, are the same, as shown in FIG. 1, the intermediate positions A2 and A3 of the steering axle A are the same. .

 Next, the four adjustment positions are shown.

On the contrary, by greatly differentiating the values of the axial center distance H1 and the axial center distance H2, the positions of A2 and A3 become different.
It is possible to adjust the height of the steps.

(F) Effects of the Invention Since the present invention is configured as described above, it has the following effects.

First, in the conventional vehicle height adjusting device, the steering wheels 11
Adjust the steering axle A with respect to the kingpin position.
Since it moves up and down, if you try to adjust the steering wheel alignment such as camper, caster, toe-in so as not to change, it is absolutely necessary to rotate the final axle case 9 up and down 180 degrees, which is usually lower than the height. It was supposed to take only two positions, the position.

On the other hand, as in the present invention, by providing vehicle height adjusting portions at a plurality of positions before and after the kingpin 3, the vehicle height can be adjusted in three steps or more by combining the adjustments at the plurality of places, and the orchard. It was possible to obtain a vehicle that can be used for three types of work, such as under-branch work, normal paddy work, and furrow work in fields.

Secondly, by providing a plurality of vehicle height adjusting portions, a reduction gear train can be formed for each shaft turning position for adjusting the vehicle height, so that a large reduction ratio from the engine to the axle can be achieved. It is possible.

[Brief description of drawings]

Figure 1 is an overall side view of a tractor with a vehicle height adjustment device.
Fig. 2 is a front sectional view of the kingpin front stage adjusting part in the low position, and the kingpin rear stage adjusting part is in a high state, and Fig. 3 is a side sectional view of the kingpin front stage adjusting part in the low state and kingpin rear stage adjusting part in the low state. FIG. 4 and FIG. 4 are front sectional views showing a state in which the kingpin pre-stage adjusting portion is high. A …… Steering axle B …… Vehicle height adjustment central axis C …… Rear wheel vehicle height adjustment central axis D …… Drive axle 1 …… Front axle shaft 2 …… Counter shaft 3 …… King pin 4 …… Vehicle height adjustment Case 5 …… Front axle case 9 …… Final axle case 11 …… Steering wheel 12 …… Drive wheel

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-202938 (JP, A) JP-A-60-15224 (JP, A) Actual opening Sho-58-111626 (JP, U) Actual opening Sho-61- 169627 (JP, U)

Claims (1)

(57) [Claims] 1. A front axle case 5, 5 is provided extending leftward and rightward from a front differential gear device, and the vehicle height adjusting case 4 is pivoted up and down 180 degrees at both ends of the front axle case 5, 5. Thus, the upper and lower kingpin front-stage adjusting parts are configured, the turning side bevel gear box 7 is fixedly mounted on the vehicle height adjusting case 4, and the kingpin 3 is pivotally supported on the turning side bevel gearbox 7 to perform the turning. A final axle case 9 in which the steering axle A is pivotally supported by the side bevel gear box 7.
By rotating up and down by 180 degrees, the upper and lower two stages of the king pin rear stage adjusting part are configured, and the king pin front stage adjusting part and the king pin rear stage adjusting part are separately arranged before and after the king pin 3, and the steering axle A A vehicle height adjustment device characterized by having three or more vertical adjustment stages.