JPS6348457Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a front wheel rut distance adjusting device for a four-wheel drive vehicle.

2. Description of the Related Art Some four-wheel drive tractors and the like equipped with a working machine are designed to be able to adjust the distance between the ruts of the left and right wheels in order to improve workability. However, although conventional rut-to-rut distance adjustment devices can easily adjust the rut-to-rut distance for the rear wheels, which are independent of the steering device, the complicated steering link mechanism etc. for the front wheels, which have a steering device, poses an obstacle. Although it is possible to implement a distance adjustment device between ruts with a complicated structure, it is not possible to implement a distance adjustment device between ruts with a simple structure.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to enable the driver to easily adjust the distance between ruts while sitting in the driver's seat even if the front wheels of the drive system are equipped with a steering device. An object of the present invention is to provide a front wheel track distance adjustment device for a four-wheel drive vehicle.

The front wheel rut distance adjustment device for a four-wheel drive vehicle of the present invention achieves the above object, and the front wheel drive case, which is slidably connected to both sides of the front axle case, is capable of adjusting the rut distance via a hydraulic cylinder. Tie rod arms, which are configured and interlockingly connected to each other via tie rods, are pivotally supported on both ends of the front axle case, and interlocking links integrally connected to the tie rod arms are provided on the front wheel drive case side. A connecting mechanism consisting of a long hole provided in one link and a pin provided at the end of the other link that slidably fits into the long hole connects the steering link that can be steered around the kingpin. It is characterized by interlocking connections.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings.

1 and 2 are a plan view and a side view of a four-wheel drive tractor equipped with a front wheel track distance adjustment device according to the present invention.

In Figures 1 and 2, 1 is the front wheel installed on the left and right sides of the front of the aircraft, 2 is the rear wheel installed on the left and right sides of the rear of the aircraft, 3 is the driver's seat, and 4 is the front wheel installed in front of the driver's seat 3. The steering wheel is By rotating the steering handle 4 left and right, a power steering booster 5 is operated, and the power steering booster 5 operates a connecting link 7 integral with the tie rod arm 6 via an arm 7b. The tie rod arm 6 is configured so that the left and right front wheels 1 can be steered left and right through a tie rod arm 6' on the opposite side, which is connected to the tie rod arm 6 via a tie rod 6b.

FIG. 3 and FIG. 4 are a front view and a plan view showing a front wheel portion of the above-mentioned four-wheel drive tractor, partially in section.

In FIGS. 3 and 4, reference numeral 8 denotes a front axle case, and hydraulic cylinders 9 are mounted on the outer walls of both ends of the front axle case 8 so as to be located in spaces sandwiched by tie rods 6b. ing. Furthermore, a front wheel drive case 10 is provided at both ends of the front axle case 8 with its cylindrical portion 10a inserted so as to be slidable in the axial direction. This front wheel drive case 10 is fixed to the tip of a piston 9a of a hydraulic cylinder 9, and by remotely controlling the hydraulic cylinder 9 from the driver's seat, the front wheel drive case 10 is axially attached to the front axle case 8 via the piston 9a. The displacement can be adjusted. Therefore, by adjusting the displacement of the front axle case 8 of the front wheel drive case 10 in the axial direction, the distance between the tracks between the left and right front wheels 1 is adjusted.

The power of the pinion shaft 11, which rotates by receiving power from the transmission, is transmitted to the left and right shafts 13 via the differential gear 12.The ends of the shafts 13 have a hollow structure with spline holes. The spline grooved end of the shaft 14 held in the front wheel drive case 10 is slidably fitted into the spline hole. Therefore, as described above, the front wheel drive case 10 is moved to the front axle case 8 by the hydraulic cylinder 9.
When the shaft 14 is displaced relative to the front wheel drive case 10, the shaft 14 held by the front wheel drive case 10 also moves together and is displaced relative to the shaft 13.

The ends of tie rod arms 6, 6', which are rotatably supported via fixed pins 6a, 6'a at both ends of the front axle case 8, are rotatably connected to each other by a tie rod 6b. Further, elongated holes 7a, 7'a are bored in interlocking links 7, 7' integrally connected to the tie rod arms 6, 6'. On the other hand, in the front wheel drive case 10,
The steering link 1 uses the king pin 10b as a fulcrum.
5 is rotatably supported, and this steering link 15 is provided so as to rotate integrally with a front wheel bearing case 16. This steering link 1
A pin 15a is fixed to the end opposite to the side fixed to the front wheel bearing case 16 of 5, and this pin 15a is connected to the long hole 7 of the interlocking links 7, 7' described above
a, 7'a are inserted and engaged. Therefore,
When the interlocking link 7 is rotated by the power steering booster 5 via the arm 7b, the tie rod arm 6' on the opposite side is interlocked via the tie rod 6b, and the interlocking link 7 integrated with these tie rod arms 6, 6' is rotated. ,7' long hole 7
The front wheels 1, 1 can be steered by operating the steering links 15, 15 which are engaged with the wheels 15a, 7'a via pins 15a.

According to the above-mentioned device, the interlocking links 7, 7' and the steering links 15, 15 are connected to the long holes 7a, 7'a of the interlocking links 7, 7' and the pin 1 of the steering links 15, 15.
5a and 15a, the front wheel drive case 10 is displaced with respect to the front axle case 8, and the distance between the front wheels' tracks changes.
No length adjustment is necessary.

5A and 5B show the front wheel drive case 1.
The figure shows the state of steering operation when the pin 10 is displaced relative to the long hole 7a of the interlocking link 7.
When the distance between the front wheels is short, set the position of 5a to the 5th position.
As shown in FIG. A, the link is moved closer to the pivot point of the interlocking link 7, and when the wheel gap between the front wheels is long, the link is moved farther away from the pivot point of the interlocking link 7 as shown in FIG. 5B.
5a are engaged with each other so as to be freely slidable and rotatable.
For the same rotation angle, the steering angle of the steering link 15 becomes larger, and therefore, even if the wheel rut distance becomes larger, the turning radius of the vehicle body does not increase proportionately.

FIG. 6 shows another embodiment of the present invention, in which the engagement relationship between the pin and the elongated hole in the sliding and rotatable mechanism between the interlocking link 7 and the steering link 15 is different from that of the above embodiment. It is configured in reverse. That is, a pin 7c is fixed to the interlocking link 7, and a long hole 15b is bored in the steering link 15.
and the pin 7c are slidably and rotatably engaged, and the same effects as in the above embodiment can be obtained.

As described above, the front wheel rut distance adjustment device for a four-wheel drive vehicle of the present invention enables the front wheel drive case, which is slidably connected to both sides of the front axle case, to adjust the rut distance via a hydraulic cylinder. The front axle case includes tie rod arms that are connected to each other via tie rods, and are pivotally supported on both ends of the front axle case, and an interlocking link that is integrally connected to the tie rod arm and a king pin provided on the front wheel drive case side. Interlocking connection between a steering link that can be steered as a center by a connecting mechanism consisting of a long hole provided in one link and a pin provided at the end of the other link that slidably fits into the long hole. With this configuration, the steering system tie rod arms, which are connected to each other via tie rods, are pivoted to both ends of the front axle case, thereby making it possible to move the front wheel drive case and adjust the distance between ruts. The front wheel drive case can be moved independently of the driver's seat, and the front wheel drive case can be moved without adjusting the length of the tie rod. The distance between the front wheel ruts can be adjusted.

Furthermore, between this movable steering link on the front wheel drive case side and the interlocking link that is integrally connected to the tie rod arm on the front axle side, there is a long hole provided in one link, and the link can be slid freely into the long hole. With a simple structure that only requires a connecting mechanism consisting of a pin provided at the other end of the link that fits into the tie rod arm, it is possible to allow movement of the front wheel drive case side independently of the tie rod arm, and also to allow the kingpin to move in this moved position. Steering on the front wheel drive case side, which is the center, can also be permitted. Furthermore, the larger the distance between the front wheels' tracks, the larger the steering angle of the steering link can be set for the same rotation angle of the interlocking link, so even if the distance between tracks is increased, the turning radius of the aircraft will increase proportionally. Never.

[Brief explanation of the drawing]

1 and 2 are a plan view and a side view of a tractor equipped with a front wheel rut distance adjustment device for a four-wheel drive vehicle according to the present invention, and FIGS. 3 and 4 show a part of the front wheel portion of the tractor. A front view and a plan view shown in cross section, and FIGS. 5A and 5B are plan views showing the state of steering operation by the device of the present invention, respectively. FIG. 6 is a plan view showing a steering operation according to another embodiment of the present invention. 1... Front wheel, 3... Driver's seat, 4... Steering handle, 6, 6'... Tie rod arm, 6b... Tie rod, 7, 7'... Interlocking link, 7a, 7'a
...Long hole, 8...Front axle case, 9...
...Hydraulic cylinder, 9a...Piston, 10...Front wheel drive case, 15...Steering link, 15a...
Pin, 16...Front wheel bearing case.

Claims (1)

[Scope of utility model registration request] The left and right front wheel drive cases are slidably connected to both ends of the front axle case, and the distance between the tracks can be adjusted via hydraulic cylinders, and the tie rod arms are interlocked and connected to each other via tie rods.
between an interlocking link pivotally supported on both ends of the front axle case and integrally connected to the tie rod arm, and a steering link that can be steered around a king pin provided on the front wheel drive case side; Adjustment of the distance between front wheels in a four-wheel drive vehicle that is interlocked and connected by a connecting mechanism consisting of a long hole provided in one link and a pin provided at the end of the other link that is slidably inserted into the long hole. Device.