JPH0151361B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a method for suspending wheels of an agricultural working vehicle, which reduces the inclination of the vehicle body when the ground contact wheels move up and down.

(b) Conventional method In a four-wheeled vehicle that has a pair of left and right front wheels and rear wheels, if the ground-contacting wheels incline due to undulations, irregularities, etc. of the ground-contact area, the vehicle body will also incline in the same way. In order to alleviate the tilting, vibration, etc. of the vehicle body, passenger cars are equipped with a shock absorbing mechanism such as a spring to absorb this.
However, for agricultural vehicles that are mainly used in fields with poor driving conditions such as undulating and sloping terrain where agricultural crops are cultivated, there is little point in providing a shock absorbing mechanism, etc. It is important to prevent the vehicle's center of gravity from becoming unbalanced and falling over.

For this reason, in general agricultural tractors, etc., the front part of the vehicle body is pivoted at the longitudinal center of the front axle to the front part of the vehicle body so that it can rotate from side to side (so-called pivot connection), so the vertical movement of the front wheels is limited. It has been reduced (halved). However, since the vehicle body itself is supported by the rear wheels integrally with the rear axle, the left and right movement of the vehicle body is controlled by the rear axle (rear wheels). This is especially true when the height of the vehicle is large, such as a transport vehicle, and the influence of lateral movement is large, and as mentioned above, the vehicle body tends to overturn on slopes and the like.

(c) Problems to be Solved by the Invention In view of the above circumstances, the present invention reduces (halves) the vertical motion and inclination transmitted to the front wheels (front axle) and rear wheels (rear axle) relative to the vehicle body. To provide a method for suspending wheels of an agricultural work vehicle, which allows the vehicle to transmit the information and reduces tilting and overturning of the vehicle body.

(d) Means for solving the problem In order to achieve this object, the present invention provides a front axle and a rear axle extending across the width direction of the vehicle body at the front and rear portions of the vehicle body. In an agricultural work vehicle having wheels pivotably supported, the longitudinal center portions of both axles are pivoted left and right with respect to the vehicle body to allow the wheels to move up and down. The front axle and rear axle on the same side are linked so that when the front axle or the rear axle moves up and down through the wheels as the vehicle runs, the vertical movement directions of the front axle and rear axle are opposite to each other. It is characterized by this.

(e) Examples Examples of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a vehicle body of an agricultural work vehicle, and at the front and rear portions of the vehicle body 1, longitudinal central portions of a front axle 2 and a rear axle 3 extend across the width direction of the vehicle body 1. Front rotation support part 4 provided in
and a rear rotation support part 5, which supports the rear rotation support part 5 so as to be rotatable left and right, and is pivotally connected. A front wheel 6 and a rear wheel 7 are pivotally supported at both ends of the front axle 2 and the rear axle 3, respectively.

The front axle 2 and the rear axle 3 are arranged at one side of the vehicle body 1 with their lower ends connected to the front and rear axles via pivot parts 8a and 9a.
An interlocking arm 11 is pivotably supported on the rear axles 2 and 3 so as to be rotatable left and right, and its upper end is pivotally supported on the vehicle body 1 via a pivot shaft 10 so as to be rotatable back and forth via pivots 8b and 9b. It is interlocked and connected by a front link 8 and a rear link 9 which are pivotally supported at both ends of the front and rear links so as to be rotatable back and forth.

In the embodiment described above, interlocking and connecting devices similar to those of the front and rear links 8 and 9, the pivot shaft 10, and the interlocking arm 11 may be provided on the other side of the vehicle body 1.

In the agricultural vehicle having such a configuration, when the vehicle body 1 is traveling in the direction of the arrow, the front wheels 6, 6,
If either of the rear wheels 7, 7 rides on a convex part of the ground or falls into a concave part, the front axle 2
Alternatively, the rear axle 3 rotates left and right around the front rotation support part 4 or the rear rotation support part 5, and at the same time, the interlocking arm 11 is pivoted via the front link 8 and the rear link 9. 10, and the other link 9 or 8 rotates the front axle 2 or the rear axle 3. As a result, the vehicle body 1 moves up and down in opposite directions at the front and rear rotation supports 4 and 5 and the pivot shaft 10, depending on the height of the convex part on which the wheel rides or the depth of the concave part into which the wheel falls. Therefore, the tilting of the vehicle body is small (approximately 1/2), and the center of gravity moves less, making it difficult for the vehicle to tip over. Therefore, it is highly adaptable when used in fields such as slopes. The same thing can be said even when there are small irregularities such as in a flat farm field, and a stable running condition can be obtained by reducing the lateral movement (rolling) of the vehicle body 1 to approximately 1/2.

However, the device of the present invention does not have a very good effect on vertical movement (pitching) of the vehicle body 1.

In another embodiment of the invention shown in FIG.
The front and rear links 8 of the embodiment of FIG.
9. Instead of the pivot shaft 10 and the interlocking arm 11, a front hydraulic cylinder 12 and a rear hydraulic cylinder 13 are pivoted to the front axle 2 and the rear axle 3 via pivot pins 12b and 13b, so that both hydraulic cylinders The tips of pistons 12 and 13 are pivotally supported on the vehicle body 1 via pivot pins 12a and 13a. Then, both cylinders 12 and 13 are connected with hydraulic hoses 14 and 14,
When one piston of both cylinders 12, 13 expands or contracts, the other piston also expands or contracts in the opposite direction. In this embodiment, the front wheels 6, 6 and the rear wheels 7, 7 touch the ground almost horizontally, and the vehicle body 1
The piston protrusion amounts of the hydraulic cylinders 12 and 13 are set to be approximately the same when the hydraulic cylinders 12 and 13 are approximately horizontal.

In this embodiment as well, the hydraulic cylinders 12 and 13 expand and contract with respect to the vertical movement of the front wheels 6, 6 and the rear wheels 7, 7, as in the embodiment shown in FIG. It can reduce the slope and prevent falls.

(F) Effects of the Invention As explained above, according to the method for suspending wheels of an agricultural working vehicle according to the present invention, the front axle or the rear wheel moves vertically in the longitudinal direction of the front wheel or the rear wheel due to the vertical movement of the front wheel or the rear wheel. Since it rotates left and right relative to the vehicle body around the center, and the front axle and rear wheels are linked so that their movements are on opposite sides, the vehicle body will not tilt if the wheels ride up on a convex part or fall into a concave part. is almost halved, the center of gravity of the vehicle body moves less, and it is less likely to fall over.
For example, it is suitable for agricultural work vehicles used on sloped areas.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a perspective view showing another embodiment of the present invention. 1...Vehicle body, 2...Front axle, 3...Rear axle, 4
...Front rotation support part, 5...Rear rotation support part, 6
... Wheel, 7 ... Rear wheel, 8 ... Front link, 8
a, 9a, 8b, 9b... Pivot part, 9... Rear link, 10... Pivot shaft, 11... Interlocking arm, 1
2...Front hydraulic cylinder, 12a, 12b, 13
a, 13b... Pivot pin, 13... Rear hydraulic cylinder, 14... Hydraulic hose.

Claims (1)

[Claims] 1. In an agricultural work vehicle in which a front axle and a rear axle are provided in the front and rear parts of the vehicle body across the width direction of the vehicle body, and a wheel is pivotally supported at both ends of the two axles, approximately at the center in the length direction of both said axles. The front axle and the rear axle on the same side of the left and right sides are pivoted around these pivot points so that the wheels can move up and down by rotating left and right with respect to the vehicle body. A method for suspending wheels of an agricultural work vehicle, characterized in that when the axle or the rear axle moves up and down, the front axle and the rear axle are linked so that the directions of up and down movement are opposite to each other.