JPS60179320A - Rear suspension structure for car - Google Patents

Abstract

PURPOSE:To obtain the optimum camber angle corresponding to a car height by installing an actuator for varying the suspension-member installation position in the vertical direction, between the suspension member and a chassis. CONSTITUTION:When a car-height sensor 35 detects the raising and lowering of the car height by a car-height adjuster, a selector valve 33 is operated by the detection signal. A hydraulic pressure is operated into an actuator 30 formed in a center mount 13 formed at the center of a suspension member 11, and one among fluid chambers 31 and 32 is expanded, and the other is contracted, and the inner and outer cylinders 13a and 13b are set eccentric, and the suspension member 11 is shifted upward or downward by a prescribed distance in the center mount part 13. Therefore, the swing center shaft 17 of a wheel supporting arm 14 tilts, and the camber angle in case when a suspension geometry is adjusted is made optimum.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a rear suspension structure for a vehicle.

In particular, the rear suspension structure is such that the pivot axis of the wheel support arm is attached to the suspension member at an angle with respect to the left-right direction of the vehicle.

Regarding construction.

Conventional technology A rear suspension structure for a vehicle such as an automobile is conventionally shown in L'J I 8 SAN Service Bulletin No. 442 (published by Nissan Motor Co., Ltd. in August 1980), page 129, and as shown in FIG. There is a semi-railing arm type rear suspension 1 like this. The rear suspension 1 shown in FIGS. A pair of wheel support arms 4, 4a are attached so as to be inclined in the front-rear direction with respect to the left-right direction of the vehicle.

Reference numerals 5 and 5a denote hubs 6 and 6a for attaching the wheels, which are shock absorbers disposed between the wheel support arms 4 and 4a and the vehicle body. In addition, the rear suspension 1
Since this is an F-R (70-engine rear twin) type, a housing 7 that accommodates the differential gear is fixed to the suspension member 3, and the rear end of the housing 7 is attached to the center mount 8. [It is designed to be installed on the single unit side.]

Incidentally, in recent years, in the rear suspension 1, an air spring (not shown) is provided between the wheel support arm 4.4 m and the vehicle body, and the vehicle height adjustment function is performed by changing the air pressure of the air spring. There is something like that. In addition to the type using an air spring, there are various types of such vehicle height adjustment devices. Using the vehicle height adjustment function, the vehicle height can be lowered on expressways to improve high-speed stability, and the vehicle height can be raised on uneven road surfaces to protect the underfloor.

However, in such a conventional rear suspension 1, as described above, the wheel support arm 4.4a is installed with an inclination in the front-rear direction with respect to the left-right direction of the suspension member A3K vehicle. When vertically adjusted, the camber angle of the wheel changes as the inclination angle of the wheel support arms 4, 4a changes. For example, the camber angle changes to a positive camber angle when the vehicle height is higher than the standard state in which the camber angle from the ground is set to approximately OK, and to a negative camber angle when the vehicle height is lowered. Therefore, if the vehicle height is changed significantly, the tires may wear unevenly and the steering stability may be impaired. For this reason, conventional suspensions have had the problem of not being able to accommodate a large amount of vehicle height adjustment.

In particular, when the vehicle height is raised, if the positive camber angle is too large, significant oversteer may occur, which is dangerous.

Purpose of the Invention In view of the conventional situation, the present invention provides a vehicle which has an additional function of adjusting the suspension geometry at the same time when adjusting the vehicle height to provide an optimal camber angle according to the vehicle height. The aim is to provide a simple structure for the user.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a suspension member attached to a vehicle body, in which a swinging center axis of a wheel support arm is inclined with respect to the left-right direction of the vehicle, and is mounted so as to be swingable up and down. In a vehicle that has become more flexible, an actuator is provided between the suspension member and the vehicle body for vertically varying the mounting position of the suspension member, and the actuator is actuated to vertically adjust the suspension member. The button is designed to change the suspension geometry and thereby set the wheel camber angle to the optimum Ml/C.

Example Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

That is, FIGS. 2 and 3 show a rear suspension structure of a vehicle showing one embodiment of the present invention, and this rear suspension 1
0 is an example of a semi-trailing type used in F@F (front engine front drive) cars. Reference numeral 11 denotes a suspension member extending in the left-right direction of the vehicle.The suspension member 11 is attached to the vehicle body (not shown) via mounts 12 and 12a, each of which has both ends formed of an elastic material. The center portion of the member 11 is attached to the vehicle body via a center mount 13 which is also made of an elastic material. The mounts 12, 12m have their mounting axes oriented in the vertical direction of the vehicle, and the center mount 13 has its mounting axis oriented in the longitudinal direction of the vehicle. 14
．． Reference numeral 14a designates a wheel support arm attached to both ends of the suspension member 11;
The wheel support arms 14, 141 are attached to the suspension member 11 via the wheels 5a, 16, 16a.
The rear side of the vehicle No. 1 can swing up and down. Also, the wheel support arm 14. The mounting surface of the suspension member 11 to which the suspension member 14a is mounted is inclined with respect to the left-right direction of the vehicle so that both ends of the suspension member 11 are located at the front of the vehicle.
6, 16g is installed. Accordingly, the wheel support arm 14.14a is connected to the pair of bushings 15, 15.
Jl and the tilt axis 17. which is the swing center axis connecting the centers of the bushings 16.16a. It swings up and down around center point 17a, and functions as a semi-trailing arm type suspension. and each wheel support arm 14.

At the rear end of the 14g vehicle is a hub 19 for mounting the wheel 18.

19g is rotatably supported. 20.20a is the wheel support arm 14. Shock absorber disposed between 14a and the vehicle body, 21. Similarly, 21a is an air spring disposed between the wheel support arms 14 and 14'a, and this air spring 21a is used as a part of a vehicle height adjustment device.
The vehicle height adjustment function is performed by adjusting the air pressure in 21a.

Here, in this embodiment, as shown in FIG. 3, the suspension member 1 is mounted using the center mount 13.
1. An actuator 30 is configured to move the robot 1 up and down. That is, as shown in the figure, the center slit 13 is loaded into an inner cylinder 13a, an outer cylinder 13b arranged concentrically with respect to the inner cylinder 13a, and between the inner cylinder 13a and the outer cylinder 13b. The outer cylinder 13b is fixed to the platen lla which integrally projects from the suspension member 11, and the inner cylinder 1 is configured with a rubber elastic body 13c.
3a is adapted to be attached to the vehicle body via a mounting bolt (not shown) inserted into the inner cylinder 13a. A pair of first fluid chambers 31 and a second fluid chamber 32 are provided in the elastic body 13c, facing each other in the vertical direction of the vehicle with the inner cylinder 13a as a boundary.
By supplying hydraulic pressure such as oil pressure to one of the first and second fluid chambers 3132 to make the inner and outer cylinders 13a and 13b eccentric with respect to each other, it also functions as an actuator 30. There is. That is, the first and second
The fluid chambers 31, 32 are connected to a hydraulic pump 34 via a switching pulp 33, and the switching operation of the switching pulp 33 causes the hydraulic pressure from the hydraulic pump to be applied to the first. second fluid chamber 31,
The temperature is 320°C and the temperature is supplied to either side.

Note that the fluid chamber on the side to which hydraulic pressure is not supplied is drained. The switching pulp 33 is connected to a vehicle height sensor 35.
The vehicle height position is detected by the controller 36 based on this detection signal. The switching operation is performed by deenergizing and energizing the second solenoid 37.37g.

When the vehicle height sensor 35 detects that the vehicle height is lower than the reference value, the first solenoid 37 is turned on by a surge from the controller 36 to move the spool pulp 33a to the right in the figure. 1. Hydraulic pressure is supplied to the fluid chamber 31. Then, the internal volume of the first fluid chamber 31 expands and the outer cylinder 13b
Since the suspension member 11 is eccentrically upward relative to the inner cylinder 13a, the suspension member 11 is moved upward and supported by the vehicle body. Also, if the vehicle height is within the standard value,
The controller 36 controls the first. 2nd solenoid 3737
a is both OFF L, the spool pulp 33a is in the neutral position, and the first. Hydraulic pressure is not supplied to either of the second fluid chambers 31, 32. Further, when the vehicle height is above the reference value, contrary to the case where the vehicle height is below, the second solenoid 37a is turned ON to supply hydraulic pressure to the second fluid chamber 32, and the outer cylinder 13b is eccentrically downward. Accordingly, the suspension member 11 is moved downward and supported.

Based on the above configuration, the functions of the rear suspension 10 according to this embodiment will be explained based on the schematic diagrams shown in FIGS. 4, 5, and 6. Here, FIG. 4 is a plan view of the rear suspension 10, and FIGS. 5-6 are rear views thereof. In each of these figures, only the right wheel 18 will be explained since both the left and right wheels have the same function. 1, description of the left wheel not shown in Figure 1 will be omitted. That is, suspension member 1
The vertical swing center axis 17a of the wheel support arm 14a, which is attached to the wheel support arm 14a via a bushing 16m (see Figure 2), is a line connecting the centers of the bushes 16 and 16a, and this swing axis 17a is a line connecting the centers of the bushes 16 and 16a. The point A that intersects with the axle axis 40 is the center of vertical swing of the wheel for one day. Then, when the vehicle height is raised or lowered by the vehicle height adjustment device and the wheel center W position of the wheel 18 changes to the lower position W1 or the upper position Wz with respect to the vehicle body as shown in FIG. Accordingly, the camber angle of the wheel 18 also changes by θ', θ'. In this embodiment, the suspension member 11 is is moved up and down,
The camber angle change can be prevented or suppressed. For example, as shown in Figure 6, when the vehicle height is lowered and the wheel center rises by a distance from W to W2,
The vehicle height sensor 35 shown in FIG. 3 detects this and creates the switching valve 33 aL, -! lI-Suspension Menha 11 Move upward by l[l (l<L)).

At this time, only the senkumaran 13 portion of the suspension member 11 rises, and both ends of the suspension member 11 rise to the mount 12. 12aK, it is in a substantially fixed position, so the mounting surface of the wheel support arm 14g, that is, the swing center axis 17a of the wheel support arm 14a is inclined with respect to the horizontal line so that the inside of the vehicle is upward, and the swing center A becomes point A, which has moved upward by a certain amount. Therefore, after the adjustment of the suspension geometry is completed, the axle shaft 40 is approximately horizontal, and the camber angle of the wheels 18 relative to the ground can be set to an optimal state, approximately equal to that at the vehicle height reference height. Incidentally, even when the vehicle height is raised, the camber angle can be set to the optimum state by performing the opposite operation to the case where the vehicle height is lowered.

By the way, in the above embodiment, the center mount 13 is provided with the function of the actuator 30, but the suspension member 1 is not limited to this.
It goes without saying that the mount 12.12a supporting both ends of the mount 12.12a may be provided with an actuator function to change the mount position relative to the center mount 13 up and down.

Furthermore, this embodiment discloses that the camber adjustment of the wheel 18 by adjusting the vertical movement of the suspension member 11 is performed in conjunction with a vehicle height adjustment mechanism,
By adjusting the camber in this way, it is highly effective to maintain stable steering stability at all times, but instead of being linked to the vehicle height adjustment, the camber can be changed by manually moving the suspension member 11 up and down. It is also possible to change the compliance steer when the vehicle turns from understeer to oversteer, and it is also possible to obtain delicate cornering characteristics depending on the driving condition.

It should be noted that although the above-described embodiments have been described with respect to a semi-trailing type rear suspension IOK, the present invention is not limited thereto, and the present invention can be applied to a swing arm type suspension and similar effects can be obtained.

As described in detail, in the rear suspension structure for a vehicle according to the present invention, the wheel support arm is mounted by an actuator, which is a suspension member that is mounted inclined in the longitudinal direction with respect to the left-right direction of the vehicle. Since the wheel can be moved up and down, the center of swing of the wheels can be moved up and down depending on the attitude of the vehicle, for example, the height position of the vehicle using the vehicle height adjustment device. [The camber angle of the wheels can be adjusted to the optimal state or a state close to this.

Therefore, tire wear can be prevented and handling stability can be ensured, and by solving the problems of uneven tire wear and handling stability, the vehicle height adjustment allowance can be increased. It has various excellent effects such as needles.

[Brief explanation of drawings]

Figure 1 is a perspective view showing a conventional rear suspension structure.
FIG. 2 is a perspective view showing an embodiment of the cabin pension structure of the present invention, FIG. 3 is an enlarged sectional view of the main part taken along the line ■-■ in FIG. 2, and FIGS. 4 and 5. FIG. 6 is a schematic diagram showing the operating state of the rear suspension structure of the present invention. 1.10... Rear suspension, 3.11... Suspension member, 4.4a, 14. 1431・
・・Wheel support arm, 17.17g・・Swinging center shaft,
18... Wheel, 30... Actuator, 31.3
2...Fluid chamber, 33...Switching pulp, 35...Vehicle height sensor, 36...Controller. Figure 1 Figure 2 Figure 3 0 18

Claims (1)

[Claims] (1) In a vehicle in which the swing center axis of the wheel support arm is inclined with respect to the left-right direction of the vehicle and is mounted on a suspension member attached to the vehicle body so as to be able to swing vertically, the suspension member A rear suspension structure for a vehicle, characterized in that an actuator is provided between the suspension member and the vehicle body to change the mounting position of the suspension member in the vertical direction.