JPS6347671B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rear wheel steering device for controlling compliance steer caused by side force when a vehicle turns.

As a conventional rear wheel steering device of this type, there is a device as shown in FIG. 1 (Japanese Utility Model Application No. 147968/1983). In the figure, 1 is a rear wheel, 2 is an axle, and this axle 2 is formed integrally with left and right knuckle arms 3, 3', respectively.
is suspension beam 5 via kingpin 4
It is pivotally supported by the nutkl arm 3, 3'
The movable side of is connected by tie rod 6,
The free end of one of the knuckle arms 3 is adapted to be operated by a hydraulic or pneumatic cylinder 7.

However, in such a conventional rear wheel steering device, a suspension having a king pin 4 was required to steer the rear wheels 1.
The problem is that installing a rear wheel steering device like the one shown in Figure 1 on a conventional car with a rear wheel suspension without a king pin requires a major design change, which inevitably leads to a significant increase in costs. The dot was hot.

This invention was made in view of the above-mentioned problem, and involves connecting the rear wheel suspension to the vehicle body via an elastic body such as a rubber bushing, and steering the rear wheels by forcibly deforming the elastic body. The purpose is to solve the above problems.

Embodiments of the present invention will be described below based on the drawings. In the figure, 8 is a rear wheel, and 15 is a vehicle body.

Figures 2 to 4 show a trailing arm 34 that regulates the toe angle of the rear wheel 8 and positions it in the front-rear direction, a lateral link 35 that positions the rear wheel 8 in the left-right direction, and these arms. 34 and a link 35 are rotatably connected to each other, a strut 37 rigidly connected to the axle 36, and a coil spring 38. The configuration of the connecting portion of the tip end to the vehicle body 15 is shown in detail in FIG. 4. In other words, 27 in the figure is an outer cylinder provided at the connecting portion of the arm 34;
8 is a rubber bushing fixed inside this outer cylinder 27;
9 is an inner cylinder fixed inside this rubber bushing 28;
0 is a connecting bolt passing through the bracket 26 and the inner cylinder 29, and 31 is its nut.

In this case, a bracket 34a is provided protruding from the front part of the trailing arm 34, and a hydraulic cylinder 16 is interposed between the bracket 34a and the vehicle body 15 as an actuator. 17 is an electromagnetic proportional spool valve for controlling the hydraulic cylinder 16, and 17a and 17b are solenoids. 18 is an oil pump, 19 is an oil tank, 20 is a steering wheel of the vehicle, 21 is a steering angle detector that detects the amount of operation of this steering wheel 20, and 22 is this steering angle detector 21
Amplify the output signal of solenoid 17a or 1
7b to control the valve 17.

In this device, the hydraulic cylinder 16 allows
When the trailing arm 34 is pulled in the direction of arrow H, the connection point P of the lateral link 35 on the axle 36 side
The trailing arm 34, the axle 36, and the rear wheel 8 rotate together around the rear wheel 8, and the rear wheel 8 is steered as shown by the chain diagram in FIG.

5 and 6 show the trailing arm 3
9, an upper lateral link 40, and a lower lateral link 41, and the structure of the connection between the tip of the trailing arm 39 and the vehicle body 15 is the same as in the previous embodiment. . In this case as well, a hydraulic cylinder 16 is inserted as an actuator between a bracket 39a protruding from the front part of the trailing arm 39 and the vehicle body 15. Therefore, by operating the hydraulic cylinder 16, the fifth
By pulling the trailing arm 39 in the direction of arrow I in the figure, the rear wheels 8 can be steered as shown in the chain diagram.

7 and 8 show the present invention applied to a suspension consisting of a trailing arm 42 with a wide connecting portion to the vehicle body 15 and one lateral link 43. The structure of the connecting portion with the vehicle body 15 is similar to the structure consisting of the outer cylinder 27, the bracket 26, etc. described above.

In this case, a bracket 42a is provided protruding from the inside of the front part of the trailing arm 42, and this bracket 42a
A hydraulic cylinder 16 is provided between 2a and the vehicle body 15 as an actuator.

Therefore, when the hydraulic cylinder 16 is operated to pull the trailing arm 42 in the direction of arrow J in FIG. 7, for example, the arm 42 and the rear wheel 8 are displaced as shown by the chain diagram.

As explained above, according to the present invention, the suspension is attached to the vehicle body via an elastic body such as a rubber bush, and the elastic body such as the rubber bush is deflected by a separately provided actuator such as a hydraulic cylinder or a pneumatic cylinder. As a result, since the rear wheels are steered, it is possible to provide a rear wheel steering device to a conventional vehicle without making a major design change.

Further, in the present invention, since an actuator such as a hydraulic or pneumatic cylinder is provided separately from an elastic body such as a rubber bushing, high-pressure oil pressure or pneumatic pressure can be used, and the strength and durability of the elastic body such as a rubber bushing is improved. It also has the effect of eliminating worries.

Furthermore, by supporting the lateral load with the lateral link, the device of the present invention can reduce disturbances due to external forces entering the actuator, and can accurately steer the rear wheels according to the pressure of the actuator.

In addition, since the operating direction of the actuator is made to approximately match the direction in which the elastic body (rubber bushing) provided at the front end of the trailing arm connects to the vehicle body is easily deflected, the biasing force is small and the actuator can be made smaller. You can also get the effect of being able to do it.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an example of a conventional rear wheel steering device, FIG. 2 is a plan view of an embodiment of the device of the present invention, and FIG.
The figure is an elevational view, FIG. 4 is a partial sectional view, FIG. 5 is a plan view of another embodiment, FIG. 6 is an elevational view, and FIG.
The figure is a plan view of another embodiment, and FIG. 8 is an elevational view thereof. 8... Rear wheel, 15... Vehicle body, 16... Hydraulic cylinder,
17...Electromagnetic proportional spool valve, 18...Oil pump, 19...Oil tank, 20...Handle, 2
1... Rudder angle detector, 22... Amplifier, 27... Outer cylinder, 2
8... Rubber bush, 29... Inner cylinder, 30... Connection bolt, 31... Nut, 34... Trailing arm,
35... Lateral link, 36... Axle, 37... Strut, 38... Coil spring, 39... Trailing arm, 40... Upper lateral link, 41
...lower lateral link, 42...trailing arm, 43...lateral link.

Claims (1)

[Claims] 1 A trailing arm that is arranged to extend substantially in the longitudinal direction of the vehicle, whose front end is connected to the vehicle body via an elastic body by an axis oriented substantially in the left-right direction of the vehicle, and whose rear end has a wheel attached. , in a rear wheel suspension consisting of a lateral rod that is swingably attached between the rear end of the trailing arm and the vehicle body and extends substantially in the left-right direction of the vehicle, the rear wheel suspension is activated by detecting the operation of the front wheel steering device. an actuator that is swingably connected between the vicinity of the front end of the trailing arm and the vehicle body, and the operating direction of the actuator is made to substantially coincide with the axis of the elastic body. Steering device.