JPH07125528A - Controller for suspension - Google Patents

Abstract

PURPOSE:To change the attitude of a vehicle in order to stabilize the vehicle by connecting the centers of the turning movement of right and left upper links to each other by means of a link capable of being moved only in the right and left directions, and by moving the link by a control cylinder to be operated by stroke of lower links when the phase difference is generated on right and left wheels. CONSTITUTION:When side force is applied to the lower surfaces of right and left wheels 5, 5' by traveling on a curved road, lower links 3, 3' are upwardly turned by the rightward inclination of a vehicle body, thereby feeding and receiving cylinders 15, 16 are compressed. When the lower links 3, 3' are kept in the specific positions to the vehicle body, oil is allowed to flow in a control cylinder 17 through connecting pipes 18, 19, so as to extend a piston rod. Accordingly, a control link 11 is moved leftward, and upper links 2, 2' are pressed leftward, and then wheels 5, 5' are made to fall leftward by changing the camber of the wheels 5, 5' after pulling the link 7. In this time, the feeding and receiving cylinders 15, 16 are propped between the lower links 3, 3' and the vehicle body, thereby the car body is restrained from falling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension control device for a passenger car or the like, and more particularly to a suspension control capable of controlling the camber of the left and right wheels by detecting the movement of the suspension member due to the change of the posture of the vehicle body and the change of the road surface. It relates to the device.

[0002]

2. Description of the Related Art As shown in FIG. 3, a double wishbone type suspension, which is often used in passenger cars, has an upper link 2 whose base ends are rotatably supported on a vehicle body 1,
Wheels 5 and 5'are supported at the respective tips of 2'and the lower links 3 and 3'via knuckle arms 4 and the like, and the lower links 3 and 3'are usually made longer than the upper links 2 and 2 '. Unequal parallel links are used. With such a link, for example, when the wheel 5 rides on a convex portion of the road, the wheel 5 moves upward in an arc without almost any lateral displacement of the contact surface with the road surface.
It will change like c. In the above-mentioned conventional structure, the camber changes independently for each of the left and right wheels 5, 5 ', and the operation force of the steering wheel at the time of steering is changed intricately according to the behavior of the wheels, and the centrifugal force is exerted during the rolling motion of the vehicle. Due to this, there is a problem that the wheels are inclined outward together with the vehicle body to generate a canvas last.

The idea of changing the camber according to the running condition of the vehicle and the driver's preference to change the motion characteristics of the vehicle is disclosed, for example, in Japanese Utility Model Laid-Open No. 61-36408. That is, this is a strut-type independent suspension suspension, in which a rod that movably supports an upper strut fulcrum and connects the left and right upper strut fulcrums is provided, and the rod is displaced by expansion and contraction of a hydraulic cylinder to change the camber. Means are provided.

[0004]

However, in the one disclosed in the above publication, the camber is set to an arbitrary value according to the stone of the driver, and the suspension stroke, that is, the wheel formed by the upper link or the lower link is used. There is a problem that the camber cannot be set to an optimum value by the amount of movement of the vehicle up and down, and that the posture of the vehicle cannot be changed so as to stabilize the vehicle when the vehicle rolls. The present invention has been devised to solve the above problems, and stabilizes the vehicle by controlling the camber of the left and right wheels and the like by grasping the movement of the suspension member accompanying the posture change of the vehicle body and the change of the road surface. It is an object of the present invention to provide a suspension control device capable of changing its posture.

[0005]

In order to achieve the above object, the suspension control device of the present invention supports the rotation centers of the left and right upper links of the wishbone type suspension on the vehicle body so as to be movable only in the left and right directions. In addition to being connected by a control link, the link can be moved when a phase difference occurs between the left and right wheels by a control cylinder pipe-connected to a pair of transmission / reception cylinders operated by the strokes of the left and right lower links in the suspension. Characterize.

[0006]

[Operation] In the suspension control device of the present invention having the above-described structure, when side forces act on the lower surfaces of the left and right wheels due to traveling on a curved road or the like, the lower link consequently rotates upward due to the leaning of the vehicle body to the right. Therefore, when the transmission / reception cylinder 16 is compressed between the vehicle body and the lower link, while the lower link maintains a constant position with respect to the vehicle body, oil or the like enters the control cylinder through the connecting pipe and extends the piston rod thereof. Therefore, move the control link to the left against the right return spring, push the upper link to the left,
Pull the link to change the camber of the wheel and tilt the wheel to the left. At this time, the transmission / reception cylinder is stretched between the lower link and the vehicle body, thereby suppressing the vehicle body from collapsing.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 2 assuming that the same reference numerals as those in FIG. 3 represent the same elements. The return springs 14 and 14 'are provided between the spring receiver 13 fixed near both ends and the support member 12 so as to be movable in the left-right direction (arrow direction), and at both ends of the control link 11. Is the upper link 2,
2'is rotatably connected. The base ends of the upper links 2 and 2'are set so as to be located at the left and right end portions above the vehicle body 1 when the normal wheels 5 and 5'indicate normal wheel alignment. Reference numerals 15 and 16 denote transmission / reception cylinders. The transmission / reception cylinder 15 has hydraulic chambers 15c and 16c formed on the piston rod 15b side of the hydraulic cylinder 15a and on the opposite side of the piston rod 16b of the hydraulic cylinder 16a. The transmission / reception cylinder 15 has its base end rotatably mounted in the middle of the lower link 3, and the end of the piston rod 15b is rotatably mounted near the left end of the intermediate height of the vehicle body 1, and the transmission / reception cylinder 16 has its base end mounted rotatably. It is rotatably mounted near the right end of the intermediate height of the vehicle body 1 and at the end of the piston rod 15b in the middle of the lower link 3 '. Reference numeral 17 denotes a control cylinder, the base end of which is fixed in parallel with the control link 11, and the end of the piston rod 17b is connected to a protrusion 11a provided in the middle of the control link 11. The hydraulic chambers 15c, 16c and 17c of the three cylinders 15, 16 and 17
The spaces are connected by connecting pipes 18 and 19.

In the suspension control device of the present embodiment having the above-described structure, side forces as shown by arrows in FIG. 2 act on the lower surfaces of the left and right wheels 5, 5'from the state of FIG. 1 by traveling on a curved road, for example. At that time, the lower link 3 ′ is turned upward due to the tilting of the vehicle body 1 to the right, so that the oil and the like in the transmission / reception cylinder 16 is compressed between the vehicle body 1 and the lower link 3 ′, while the lower link 3 ′ is compressed. Is Figure 1
When the state is maintained, oil or the like enters the hydraulic chamber 17c of the control cylinder 17 through the connecting pipes 18 and 19 and extends the piston rod 17b. Therefore, the control link 11 is moved to the left in FIG. 2 against the right spring 14 ′, the upper link 2 is pushed to the left, and the same link 2 ′ is pulled to pull the wheels 5,
Change the camber of 5'and tilt the wheels 5, 5'to the left. At this time, the transmission / reception cylinder 16 is stretched between the lower link 3'and the vehicle body 1 to prevent the vehicle body 1 from collapsing.

[0009]

As described above, in the suspension control device of the present invention, the rotation centers of the left and right upper links of the wishbone type suspension are connected by the control link which is supported on the vehicle body so as to be movable only in the left and right directions. ,
The link is made to move when a phase difference occurs between the left and right wheels by a control cylinder that is pipe-connected to a pair of transmission and reception cylinders that are operated by the strokes of the left and right lower links in the suspension. There is an effect that the movement to the wheel can be reflected in the change amount of the camber of the wheel, and the posture can be changed so as to stabilize the vehicle when a lateral external force acts on the wheel.

[Brief description of drawings]

FIG. 1 is a schematic front view of a suspension to which a suspension control device of the present invention is applied.

FIG. 2 is a schematic front view explaining the operation of the suspension control device of the present invention.

FIG. 3 is an overall view of a conventional suspension 1; vehicle body 2, 2 ′; upper link 3, 3 ′; lower link 4; knuckle arm 5, 5 ′; wheel 11; control link 12; support member 13; spring bearing 14, 14 '; Return springs 15 and 16; Transmission / reception cylinder 17; Control cylinders 18 and 19; Connection pipe.

Claims (1)

[Claims] 1. A control link that supports the left and right upper links of a wishbone type suspension on a vehicle body so as to be movable only in the left and right directions, and
A suspension control device characterized in that the link is moved when a phase difference occurs between the left and right wheels by a control cylinder pipe-connected to a pair of transmission / reception cylinders that are operated by strokes of the left and right lower links in the suspension. .