JPH0623445Y2 - Vehicle height adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a vehicle height adjusting device for a vehicle such as an automobile.

(Prior Art) As a vehicle height adjusting device for use in an automobile or the like, for example, a jack cylinder for vehicle height adjustment is attached to an upper end portion of a piston rod of a hydraulic shock absorber arranged between a vehicle body and wheels. The plunger is slidably fitted in the cylinder,
Further, a spring seat for receiving the upper end portion of the suspension spring is arranged under the plunger, and hydraulic oil is supplied between the jack cylinder and the plunger to raise or lower the jack cylinder to adjust the vehicle height. What you have done is known.

(Problems to be solved by the invention) The vehicle height adjusting device for a vehicle described above adjusts the vehicle height by supplying hydraulic oil between the jack cylinder and the plunger according to, for example, the condition of the road surface or the weight of the loaded luggage. It's just something to do.

Therefore, when lateral acceleration of a certain amount or more (hereinafter referred to as "lateral G") acts on the vehicle body when the vehicle turns a corner, the vehicle body sinks on the side opposite to the side where the vehicle body tries to bend, and the side on which the vehicle body tries to bend rises. Rolling phenomenon is likely to occur.

(Means for Solving Problems) In order to solve the above problems, the present invention provides a hydraulic cylinder that slidably contacts a piston that interlocks with rotation of a steering wheel.
When the oil chambers of the hydraulic cylinder communicate with the jack cylinders of the hydraulic shock absorbers arranged on the left and right wheels and also between the oil chambers, and when the lateral G applied to the vehicle exceeds a predetermined value. A means for interrupting communication between the oil chambers of the hydraulic cylinder was provided.

(Operation) When the lateral G applied to the vehicle is equal to or less than the predetermined value, the oil chambers of the hydraulic cylinder are communicated with each other, and even if the piston of the hydraulic cylinder moves according to the steering state, the vehicle height adjusting function according to the running state of the vehicle body Although it does not work, when the lateral G applied to the vehicle exceeds a predetermined value, the oil chambers of the hydraulic cylinder are separated, and the piston moves in accordance with the steering state. Hydraulic oil is supplied into the jack cylinder, hydraulic oil in the other jack cylinder is returned to the hydraulic cylinder, and the vehicle height adjustment function works according to the running state of the vehicle body, which raises the vehicle height on the sinking side and raises it. The vehicle height on the side becomes low and rolling is prevented.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view of a vehicle height adjusting device according to the present invention.

In the hydraulic shock absorber 1, a piston rod 3 is inserted into a cylinder 2 from above, and a piston or the like (not shown) slidably contacting the inside of the cylinder 2 is fitted to a tip end portion of the piston rod 3. Then, the upper end of the piston rod 3 is fixed to the inner base 6 of the mount rubber 5, and the outer base 7 of the mount rubber 5 is attached to the vehicle body 8 via the bolt 9.

A jack cylinder 10 for adjusting the vehicle height is fixed to the upper end of the piston rod 3, and a plug 11 is attached to the upper wall of the jack cylinder 10.
A plunger 12 is provided inside the shaft 0 so as to be slidably contactable with the outer circumference of the piston rod 2 and the inner circumference of the jack cylinder 10. Further, the lower surface of the plunger 12 and the stopper rubber 1
3, an upper spring seat 14 is engaged with the upper spring seat 14, and a suspension spring 16 is tensioned between the upper spring seat 14 and a spring seat 15 attached to the outer peripheral surface of the cylinder 2; An upper end portion of the dust cover 17 is engaged with the outer peripheral edge portion and hangs down on the outer periphery of the plunger 11.

The hydraulic shock absorber 1 is a hydraulic shock absorber (suspension) on the right side front, but the right side rear shock absorber and the left side front and rear hydraulic shock absorbers are also configured in the same manner as the hydraulic shock absorber 1. In particular, the plunger 12 in the jack cylinder 10 of each of the front and rear hydraulic shock absorbers
The pressure receiving areas of are set equal in order to simultaneously adjust the vehicle height on the right side or the left side.

On the other hand, both ends of the hydraulic cylinder 21 are sealed by sealing members 22, and a piston 24 fixed to a piston rod 23 is slidably fitted in the hydraulic cylinder 21, and the hydraulic cylinder 21 is driven by the piston 24. Two oil chambers S inside
It is divided into R and SL. Then, a steering rack 27 is engaged with the pinion 26 that rotates in accordance with the rotation of the steering shaft.
7 and the piston rod 23 of the hydraulic cylinder 21 are connected by a connecting member 28 so that the piston 24 moves in the hydraulic cylinder 21 in accordance with the rotation of the steering shaft.

Further, one oil chamber SR in the hydraulic cylinder 21 has a pipe 3
1 to the jack cylinder 10 of the hydraulic shock absorber 1 on the front of the right side and the jack cylinder of the hydraulic shock absorber on the rear of the light side (not shown), and the other oil chamber SL is connected via a pipe 32 to the front of the left side and Communicates with the jack cylinder of each hydraulic shock absorber at the rear, and further oil chamber SR
And the oil chamber SL are connected by a pipe 33.

Then, according to the acceleration detector (G sensor) 35 that detects the lateral G on the vehicle body, the amplifier 36 that amplifies the output of the G sensor 35, and the output of the G sensor 35 that is amplified by the amplifier 36. A solenoid valve 37 that operates is provided, a valve 39 is attached to a plunger 38 of the solenoid valve 37, and the valve 39 is provided in a pipe 33 that connects the oil chamber SR and the oil chamber SL of the hydraulic cylinder 21.
When the output of 5, that is, the lateral G applied to the vehicle body exceeds a predetermined value, the solenoid valve 37 operates to operate the valve 39.
The communication between the oil chamber SR and the oil chamber SL is cut off.

The operation of the vehicle height adjusting device configured as described above will be described below.

First, when the vehicle travels straight or is gently cornering and the lateral G of a predetermined value or more does not act on the vehicle body, the output of the G sensor 35 is less than the set value, so the solenoid valve 37 is in the inoperative state. Turned valve 39
Is separated from the inside of the pipe 33, and the oil chamber S of the hydraulic cylinder 21 is
A pipe 33 connects between R and SL. Therefore, the rotation of the steering shaft causes the steering rack 27 to move in the arrow L direction or the arrow R direction to move the piston 2
Even if 4 moves in the same direction, the hydraulic oil in the oil chamber on the compressed side only returns to the expanded oil chamber, and no hydraulic pressure is applied between the jack cylinder 10 and the plunger 12 of the hydraulic shock absorber 1. The vehicle height does not change.

On the other hand, when a lateral G exceeding the predetermined value is applied to the vehicle body due to large cornering of the vehicle, G
Since the output of the sensor 35 exceeds the set value, the solenoid valve 37 is activated and the valve 39 enters the pipe 33, and the communication between the oil chambers SR and SL of the hydraulic cylinder 21 by the pipe 33 is cut off.

At this time, for example, if the steering wheel is turned to the right and the vehicle is cornering to the right, the steering rack 27 moves in the direction of arrow R and the piston 21 of the hydraulic cylinder 21 also moves in the same direction. The oil chamber SR of the hydraulic cylinder 21 is compressed, hydraulic oil is supplied between the jack cylinder 10 and the plunger 12 of the hydraulic shock absorber 1 on the light side via the pipe 31, the jack cylinder 10 rises, and the vehicle on the right side On the other hand, the oil chamber SL of the hydraulic cylinder 21 is expanded and the pipe 32 is opened to allow the hydraulic oil between the jack cylinder 10 and the plunger 12 of the hydraulic damper 1 on the left side to return to the oil chamber SL. The jack cylinder 10 is lowered to lower the vehicle height on the left side.

Conversely, when the steering handle is turned to the left and the vehicle is cornering to the left, the steering rack 27 moves in the direction of the arrow L and the piston 21 of the hydraulic cylinder 21 also moves in the same direction. The oil chamber SL of the cylinder 21 is compressed, hydraulic oil is supplied between the jack cylinder 10 and the plunger 12 of the hydraulic shock absorber 1 on the left side via the pipe 32, and the jack cylinder 10 rises to increase the vehicle height on the left side. On the other hand, the oil chamber SR of the hydraulic cylinder 21 is expanded, and the hydraulic oil between the jack cylinder 10 and the plunger 12 of the hydraulic shock absorber 1 on the light side returns to the inside of the oil chamber SR via the pipe 31. Cylinder 10
Decreases and the vehicle height on the right side decreases.

As a means for interrupting the communication between the oil chambers of the hydraulic cylinder when the lateral G applied to the vehicle body exceeds a predetermined value, for example, as shown in FIG. 2, a weight fixed to a rod 42 in the cylinder 41 is used. 43 is provided so as to be movable in the axial direction, and a mechanical G sensor 40 is provided which is provided with balance springs 44, 44 between both end surfaces of the weight 43 and both end surfaces of the cylinder 41, respectively. A valve mechanism 47 may be attached to the tip of the rod 42 of the sensor 40 and installed in a pipe 46 that communicates between the oil chambers of the hydraulic cylinder. In this case, weight 4
It is possible to set a predetermined value of the lateral G detected by the size (weight) of 3, the set load of the balance spring 42, the spring constant, and the like.

(Effect of the Invention) As described above, according to the present invention, the vehicle adjustment mechanism provided in the hydraulic shock absorber operates according to the rotation direction of the steering wheel and the detection result of the lateral G applied to the vehicle. When cornering the vehicle, it is possible to prevent the leaning of the vehicle body by increasing the vehicle height on the sinking side and increasing the vehicle height on the rising side.

[Brief description of drawings]

FIG. 1 is a sectional view of a vehicle height adjusting device according to the present invention, and FIG. 2 is a sectional view showing another example of vehicle height adjusting control means of the shock absorber. In the drawings, 1 is a hydraulic shock absorber, 2 is a cylinder, 3 is a piston rod, 10 is a jack cylinder, 12 is a plunger, 21 is a hydraulic cylinder, 24 is a piston, 27 is a steering rack, 35 is a G sensor, and 37 is A solenoid valve 40 is a mechanical G sensor.

Claims (1)

[Scope of utility model registration request] 1. A vehicle height adjusting device for a vehicle, wherein a jack cylinder for adjusting a vehicle height is mounted on an upper end portion of a piston rod of a hydraulic shock absorber, and a plunger is slidably fitted in the jack cylinder. A hydraulic cylinder that slides a piston that interlocks with each other is provided, and each oil chamber defined by the piston of this hydraulic cylinder communicates with each jack cylinder of the hydraulic shock absorbers arranged on the left and right wheels, and also between each oil chamber. A vehicle height adjusting control means is provided for communicating with the vehicle and further for detecting a lateral acceleration applied to the vehicle and cutting off communication between the oil chambers of the hydraulic cylinder when the value exceeds a predetermined value. High adjuster.