JPS59213509A - Car height adjusting device - Google Patents

Abstract

PURPOSE:To properly adjust the car height of a car height adjusting device that can maintain a car body in almost horizontal position when a car is turned by detecting the twisting deformation of a stabilizer using a distortion meter when the car is turned and controlling the right and left car height adjusters. CONSTITUTION:When a car is turned counterclockwise, for example, the right coil spring 3 is compressed, but the left coil spring 3 is stretched and a car body 4 is tilted right loweringly centering around its longitudinal axle. The right arm section 21a of a stabilizer 17 following it is raised and the left arm section 21b is let to fall. A twisting section 18 is deformed in right twisting and the inclination of the car body is suppressed by its repulsive force. In addition, the twisting deformation is detected by a distortion meter 19 and the pressure oil is sent to the right hydraulic cylinder 5 from a hydraulic pump 10 through a control unit 20 by using the detection signals. At the same time, the oil in the left hydraulic cylinder 5 is absorbed and the car body 4 is automatically maintained in a horizontal position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides the following features when the vehicle body leans to one side due to turning or the like. This vehicle height adjustment device maintains a vehicle body in a horizontal position by forcibly pushing up the side where the vehicle height has been lowered.

When a car makes a turn, the car body tilts outward due to centrifugal force, so stabilizers are installed between the car body and the wheels to elastically prevent the car body from tilting to the left or right. However, this stabilizer, for example,
When only one wheel passes over small irregularities on the road,
Since it acts as a spring to suppress vertical movement of the axle relative to the vehicle body, if a stabilizer with a large spring constant is used to effectively suppress the tilting of the vehicle body described above, it can absorb the vertical movement of the wheels. There is a natural limit to increasing the spring constant of the stabilizer, and therefore, it has been considered extremely difficult to sufficiently suppress the tilt of the vehicle body when turning.

The present invention was completed in view of the above circumstances, and an object of the present invention is to provide a vehicle height adjustment device that can maintain a vehicle body in a substantially horizontal position even when the vehicle is turning.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a first embodiment of the present invention, in which suspension coil springs 3 are attached to both left and right ends of a rear axle housing 2, and a space between the suspension coil springs 3 and the vehicle body 4 is provided with an open top surface. A pair of hydraulic cylinders 5 are installed in which an outer cylinder 7 whose bottom surface is open is tightly and slidably fitted to the upper end of the inner cylinder 6 of the hydraulic cylinder 5. The lower end of the inner cylinder 6 of each hydraulic cylinder 5 is An oil supply port 8 and an oil drain port 9 formed in are two sets of delivery ports 1 provided in a hydraulic pump 1o equipped with an oil delivery and suction function.
1 and the suction port 12 by connecting pipes 13 and 14, and the outer cylinder 7 is moved up and down by oil supply or drainage into each hydraulic cylinder 5.

A stabilizer 17 is installed between the support part 16 that supports the front wheel 15 and the vehicle body 4, and a strain gauge 19 is attached to the center of the torsion part 18 to detect torsional deformation of the torsion part 18. is connected to a control device 20 that receives signals from the strain gauge 19 and controls the delivery and suction operations of the hydraulic pump IO, and when the torsion portion 18 of the stabilizer 17 deforms to the right, the hydraulic pump 1
0 feeds oil into the right hydraulic cylinder 5 and at the same time sucks oil in the left hydraulic cylinder 5, and conversely, the torsion part 18
When the cylinder deforms to the left, oil is sent into the left hydraulic cylinder 5 and at the same time oil is sucked into the right hydraulic cylinder 5.

Next, the operation of this embodiment will be explained.

When the car starts turning counterclockwise, the car body 4 compresses the right side coil spring 3 and expands the left side coil spring 3.
As shown by the chain line in the figure, the vehicle body 4 tilts downward to the right about the vertical axis, and accordingly, the right arm portion 21a of the stabilizer 17 rises, and the left arm portion 21b lowers.
The torsion part 18 deforms to the right and its restoring force acts to suppress the inclination of the vehicle body 4, and when the strain gauge 19 detects that the torsion part 18 deforms to the right, the detection signal is The oil is sent to the control device 20, and the oil is sent from the hydraulic pump 10 to the right hydraulic cylinder 5, and at the same time, the outer cylinder 7 is raised and the right side of the vehicle body 4 is pushed up.
At 0, the oil in the left hydraulic cylinder 5 is sucked, the outer cylinder 7 is lowered, and the left side of the vehicle body 4 is lowered, so that the vehicle body 4 assumes a horizontal position as shown by the solid line.

As the turning stroke approaches the final stage, the force that tries to tilt the vehicle body 4 downward to the right gradually decreases, so the coil spring 3 on the right side
The restoring extension force of the left side coil spring 3 and the restoring contraction force of the left side coil spring 3 act to rotate the vehicle body 4 counterclockwise around the vertical axis, and the outer cylinder 7 of the right side hydraulic cylinder 5 is caused by the above-mentioned oil supply. is rising, and the outer cylinder 7 of the left hydraulic cylinder 5 is falling, causing the vehicle body 4 to tilt downward to the left, and as a result, the torsion portion 18 of the stabilizer 17 deforms to the left. When this is detected, oil is sent into the left hydraulic cylinder 5 and its outer cylinder 7 rises, and at the same time, the oil in the right hydraulic cylinder 5 is sucked and the outer cylinder 7 descends, causing the vehicle body to move. 4 is in a horizontal position.

Incidentally, even when the automobile turns clockwise, the vehicle body 4 can be maintained in a horizontal position by the reverse procedure to that described above.

FIG. 2 shows a second embodiment of the present invention, in which, instead of the hydraulic cylinder 5 of the first embodiment, a support tube 26 is installed between the left and right ends of the rear axle housing 2 and the vehicle body 4 at the upper end. A diaphragm-type air spring 2 with a rubber membrane 27 attached
5, the support cylinder 2 of each air spring 25
The air supply port 28 and the exhaust port 29 formed in the air supply port 28 and the air exhaust port 29 formed in the air pump 30 are connected to two sets of the air supply port 31 and the suction port 32 provided in the air pump 30, which have air delivery and suction functions, respectively, by connecting pipes 33 and 34, respectively. The strain gauge 19 is also connected to a control device 40 that controls the delivery and suction operations of the air pump 30.
8 deforms to the right, the air pump 30 pumps air into the air spring 25 on the right side, and at the same time the air spring 2 on the left side
When the torsion part 18 deforms to the left, the air in the left air spring 25 is sucked, and at the same time the air in the right air spring 25 is sucked.

When the car starts turning counterclockwise, the air in the right air spring 25 is compressed and its volume decreases, and the air in the left air spring 25 becomes diluted, as shown by the chain line. When it is detected that the volume increases in the state where the vehicle body 4 tilts downward to the right and the torsion portion 18 of the stabilizer 17 is deformed to the right, air is pumped from the air pump 30 into the air spring 25 on the right side. At the same time as air is pumped in and its volume increases, the air pump 30 pumps the left air spring 2.
The air inside 5 is sucked out and its volume decreases.

As the vehicle body 4 assumes a horizontal position as shown by the solid line, and as the turning stroke approaches the final stage and the force that tends to tilt the vehicle body 4 downward to the right gradually decreases, the air on the right side is The pressure inside the spring 25 is high and its volume gradually increases, and the pressure inside the left air spring 25 is low and its volume gradually decreases, so the vehicle body 4 tilts downward to the left. When it is detected that the torsion portion 18 of the stabilizer 17 has deformed to the left, air is sent into the air spring 25 on the left side and its volume increases, and at the same time, the air inside the air spring 25 on the right side increases. is sucked in and its volume is reduced, so that the vehicle body 4 assumes a horizontal position.Furthermore, even when the vehicle turns clockwise, the vehicle body 4 is placed in a horizontal position by the reverse procedure to the above. can be retained.

FIG. 3 shows a third embodiment of the present invention, in which a pair of shock absorbers 45 are installed inside a suspension coil spring 43 attached between both left and right ends of the rear axle housing 2 and the vehicle body 4. Inner cylinder 4 of shock absorber 45
6 are connected to the hydraulic pump 10 shown in the first embodiment, and the other structure is the same as that of the first embodiment. When the car body 4 turns around, the coil spring 43 on the right side
is compressed, and the outer cylinder 47 of the right shock absorber 45 is pushed down to lower it, while the left coil spring 43 is pulled and the outer cylinder 47 of the left shock absorber 45 is pulled up. 4 tilts downward to the right as shown by the chain line, and when it is detected that the torsion portion 18 of the stabilizer 17 has deformed to the right, oil is pumped from the hydraulic pump 10 into the shock absorber 45 on the right side and the shock absorber 45 is moved outward. At the same time as the cylinder 47 rises, the oil in the left shock absorber 45 is sucked and the outer cylinder 47 descends, so that the vehicle body 4 assumes a horizontal position as shown by the solid line, and the turning stroke approaches the final stage. When the force that tends to tilt the vehicle body 4 downward to the right gradually decreases, the restoring extension force of the right side coil spring 43 and the restoring contraction force of the left side coil spring 43 act, and the above-mentioned oil supply and discharge acts. As the outer cylinder 47 of the right hydraulic cylinder 45 rises and the outer cylinder 47 of the left hydraulic cylinder 45 descends, the vehicle body 4 tilts downward to the left, which causes the torsion part of the stabilizer 17 to When it is detected that the shock absorber 18 has been deformed to the left, oil is sent into the left shock absorber 45 and the outer cylinder 47 rises, and at the same time, the oil in the right shock absorber 45 is sucked and the outer cylinder By lowering 47, the vehicle body 4 assumes a horizontal position.Furthermore, even when the automobile turns clockwise, the vehicle body 4 can be maintained in a horizontal position by the reverse procedure to that described above.

In each of the embodiments described above, the stabilizer 17 may be mounted on the rear axle 1 side, and the hydraulic cylinder 5, air spring 25, and shock absorber 45 may be mounted on the rear axle 1 side.
The devices may be provided on both the front shaft 15 side and the rear shaft 1 side, respectively.

As specifically explained in the above embodiments, the vehicle height adjustment device of the present invention includes a pair of left and right vehicle height adjusters that increase and decrease the height by supplying and discharging fluid, which are connected to the axle housing at both ends of the axle housing. Each pump is interposed between the vehicle body and has fluid delivery and suction functions, and a strain gauge is attached to the vehicle suspension stabilizer to detect the displacement of the stabilizer to control the pump's delivery and suction operations. The vehicle height adjuster is connected to a control device to control the vehicle body, and adjusts the vehicle height by increasing or decreasing the height of the vehicle height adjuster in response to the displacement of the stabilizer. When the vehicle is tilted, the height of the height adjuster on the side where the vehicle height is lowered increases and the vehicle body is pushed up, and at the same time the height of the vehicle height adjuster on the side where the vehicle height is raised decreases and the vehicle body is pushed up. Because the vehicle can be lowered, the vehicle body can be maintained in a nearly horizontal position even when turning.Moreover, the height of the vehicle height adjuster is controlled by the stabilizer, which is activated whenever the vehicle tilts. Since this is performed by detecting the displacement of

[Brief explanation of the drawing]

FIG. 1 is an operational system diagram of a first embodiment of the vehicle height adjusting device of the present invention, FIG. 2 is an operational system diagram of a second embodiment, and FIG. 3 is an operational system diagram of a third embodiment. 2: Axle housing 4: Vehicle body 5: Hydraulic cylinder 10: Hydraulic pump 17: Stabilizer 19: Strain gauge 20: Control device 25 Two air springs 30: Air pump 40: Control device 45: Shock absorber applicant Chuo Spring Co., Ltd. agent Patent attorney Hiroshi Noguchi

Claims (1)

[Scope of Claims] / A pair of left and right vehicle height adjusters that increase and decrease the height by supplying and discharging fluid are interposed between the axle housing and the vehicle body at both ends of the axle housing to provide fluid delivery and suction functions. At the same time, a strain gauge for detecting the displacement of the stabilizer is attached to the vehicle suspension stabilizer and connected to a control device that controls the delivery and suction operations of the pump, so as to respond to the displacement of the stabilizer. The vehicle height adjusting device is characterized in that the vehicle height is adjusted by increasing or decreasing the height of the vehicle height adjuster.-The vehicle height adjuster is a hydraulic cylinder. Vehicle height adjustment device 3 according to claim 1 Vehicle height adjustment device according to claim 1, characterized in that the vehicle height adjuster is an air spring.