JPS58149814A - Car-height adjusting device - Google Patents

Abstract

PURPOSE:To improve the convenience of a car for riding and loading by fixing a piston of an oil pressure device composed of an oil pump and a cylinder on one of a bumper rubber or a rubber receiver to be relatively movable to the other for lowering the height of a car during stoppage. CONSTITUTION:For driving, an oil pump 18 is operated to send oil in an oil tank 19 into a cylinder 17 via a check valve 20, and the inner pressure in the cylinder 17 is risen to a set pressure of a relief valve 21. A piston 16 is pushed down to give a buffer clearance between a bumper rubber 13 and a rubber receiver 14, and a piston reaction greater than the input to the bumper rubber 13 is given to the piston 16. For stopping the driving, the pump 18 is stopped, and a valve 22 is opened to release the inner pressure of the cylinder 17. Therefore, the piston 16 is pushed upward by the bumper rubber 13 and the rubber receiver 14 to lower the car-height. This construction permits to improve the convenience of a car for riding and loading during stoppage.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle height adjustment device, particularly to a vehicle height adjustment device that improves ease of getting on and off and loading and unloading luggage, and that lowers the vehicle height as much as possible when the vehicle is stopped. It is something.

Vehicle height adjustment device generally *1 As shown in the figure, there is a pair of left and right O
Air springs 1.1 and these air springs l.

It is equipped with an air compressor 2 that supplies IK compressed air, and when the vehicle height increases, compressed air is supplied from the air tank 3 in the air compressor 2 to the air supply valve 4 to the air spring 1. The IK is supplied to raise the vehicle height, and when the vehicle height reaches the lower region, the compressed air from the air springs 1 and 10 is discharged to the outside through the exhaust valve 6 to lower the vehicle height. This is a pressure switch provided in the air tank 8, and when the pressure in the air tank 3 is below a predetermined value, the pressure switch 6 drives the motor M of the air compressor 2 to supply compressed air to the air tank 3. However, when the pressure inside the limb air tank 3 reaches a predetermined value, the drive of the motor M is stopped to keep the pressure inside the limb air tank 3 constant. This is a dryer for removing water contained in the compressed air supplied from the Air Compressor 2 to the Air Tank 3 by 8.9.10 Fi Check Pulp. t11 is a vehicle height detection sensor, and ■ is a controller. The vehicle height detection sensor 11 detects the vehicle height, and in the vehicle height up region, the controller n opens the air intake valve 4, and the air springs 1, 1 Supply compressed air to raise the vehicle height, and conversely, when the vehicle height is in the down range, open the exhaust valve 5 with the controller U, exhaust compressed air from the air springs 1, 1, and lower the vehicle height. It looks like this.

By the way, in the conventional vehicle height adjustment device of this type, as shown in FIG. Rubber receiver 1
Due to the presence of 4, the vehicle height reduction amount 1 relative to the standard attitude is calculated by adding the deflection amount δ3 of the bumper rubber due to the sprung mass to the buffer clearance δ (t' - Jt + JIm)
Since the vehicle height cannot be expected to be low, and therefore the ease of loading and unloading cargo during boarding and disembarkation is affected, there is a drawback that even if it is desired to lower the vehicle height as much as possible when the vehicle is stopped, the vehicle height cannot be lowered sufficiently.

The present invention has been made with the aim of solving the above-mentioned conventional drawbacks, increasing the amount of vehicle height reduction as much as possible when the vehicle is stopped, and improving the ease of getting on and off and loading and unloading luggage.] , its summary structure A conventional vehicle height adjustment device such as O above is attacked with either a piston, a cylinder rubber or a rubber holder to which the piston is slidably attached, and the piston is moved relative to the other. The vehicle is made movable, and the relative positions of the hydraulic system cover bumper 2 part and the rubber receiver are made to be spaced apart from each other when the vehicle is stopped, compared to their positions in a standard traveling state.

Next, the present invention will be explained based on the drawings from FIG. 3 onwards. Note that parts that are the same as those in the prior art are designated by the same reference numerals and redundant explanations will be omitted.

FIG. 3 shows an embodiment in which a bumper rubber is attached to a piston. In the figure, reference numeral 15 denotes a hydraulic system, and the hydraulic system 15 includes a piston 16 and a cylinder 17 (the cylinder 1
It is attached to the 7a car body. ), oil pump ratio, oil tank 19, check pulp added, relief pulp 2
1. It is equipped with a discharge pulp 4, which drives the motor M of the oil pump 18 during general driving to drain the oil tank 1.
The operating oil of No. 9 is applied to the cylinder No. 1 through the check valve.
7, the pressure inside the cylinder 17 is increased to the set pressure of the relief pulp 21, the piston 16 is pushed down below the cylinder 17, and the desired amount is placed between the bumper rubber 13 and the rubber receiver 14 fixed under the spring. In addition to providing a buffer clearance of 1, it is designed to provide a piston reaction force F=a (effective cross-sectional area of the piston)×P (internal cylinder pressure) that is greater than the input to the piston 16 nibber rubber barro. Preferably, the stop motor is configured to automatically stop when the piston 16 is lowered to a predetermined position. 〈When traveling is stopped (oil pump 18
When the drive of the cylinder 17 is stopped, the discharge pulp n is simultaneously opened to release the pressure inside the cylinder 17. ! 23 indicates a fixing member under the spring.The vehicle height adjustment device of the first embodiment has the above-mentioned configuration, and during normal driving, the piston 16 receives a reaction force F that is greater than the input to the bumper 2 bar 13. As a result, even if the bumper rubber 13 exceeds the desired buffer clearance and collides with the two-part receiver 14, the piston 16 will not be pushed up against the reaction force F.
Therefore, the bumper rubber 13 effectively fulfills its function.

Next, when one run is stopped (as soon as the oil pump 18 is stopped), the discharge pulp n is opened to release the pressure inside the cylinder 17, so the compressed air is discharged from the air springs 1, 1 and the vehicle height is increased. When lowered, the bumper rubber 13 comes into contact with the rubber receiver 14, but the bumper 2 part 13 to the piston 16 are pushed by the rubber receiver 14 and the ttK cylinder 17
is pushed upwards. Therefore, it becomes possible to increase the amount of vehicle height reduction by the amount of the ticket that is pushed up.

FIG. 4 shows an embodiment in which the rubber receiver 14 is attached to the piston 16. The bumper rubber 13 is attached to the fixing member 23 under the spring, and the rubber receiver 14 is attached to the piston 16 in the third embodiment. This is the same as in the embodiment shown.

FIG. 6 shows a case in which the oil pump ratio of the power steering wheel is shared with nine oil pump ratios, and the other parts are the same as in the embodiment shown in FIG. 3.

FIG. 6 shows an embodiment in which the bumper rubber 13 is attached to the piston 16 via the upper shell 1a of the air spring 1 and the rotating bracket arm.
It is designed so that it can be moved up and down by.

As explained above, the present invention includes an air spring and an air compressor that supplies compressed air to the air spring, and when the vehicle height increases, compressed air is supplied to the air spring to raise the vehicle height. In a vehicle height adjustment device that lowers the vehicle height by discharging compressed air from an air spring when the vehicle reaches a high down range, the device includes a piston, a cylinder to which the piston is slidably attached, and a hydraulic oil supplied to the cylinder. It is equipped with a hydraulic system equipped with an oil pump for injecting oil, and either a bumper rubber or a rubber receiver is attached to the piston of the hydraulic system so that it can move relative to the other. If you stop driving the oil pump and allow the working oil in the cylinder to drain into the oil tank, etc., when the bumper rubber comes into contact with the rubber receiver and the piston is pushed when the vehicle height is lowered, this will prevent the car from collapsing. Since the piston moves by the time it is pushed, the amount of vehicle height reduction increases by the amount of movement, and it is possible to advantageously improve the ease of getting on and off the vehicle and the ease of loading and unloading cargo.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional vehicle height adjustment device, Fig. 2 is a sectional view of the same air spring, Fig. 3 and the following show an embodiment of the hydraulic system of the present invention, and Fig. 3 shows a piston with bumper rubber. Figure 4 is a partial cross-sectional block diagram when the piston is installed with a horn (-receiver), Figure 5 is a partial cross-sectional block diagram when the
The figure is a block diagram when the power steering oil pump is shared as the oil pump for the hydraulic system, and Figure 6 is a sectional view showing the case where the I (bar rubber) is attached to the piston via the upper shell of the air spring and the rotation bracket. Yes. 1@...Air spring, 2...Air compressor, 1
3-・Pampa, Rubber, 140・Rubber, Uke, 15...
...Hydraulic system, 16...Piston, 17@...Cylinder, 18.Fist/Oil pump.

Claims (1)

[Scope of Claims] (1) The air compressor is equipped with an air spring and an air compressor that supplies compressed air to the air spring, and when the vehicle height increases in the region Ke, compressed air is supplied to the air spring to increase the vehicle height. In the vehicle height adjustment device, the piston and the acid piston can be slid to lower the vehicle height by discharging compressed air from the air spring when the vehicle height is in the lower region.
Attach the attached cylinder and a hydraulic AT equipped with an oil pump to inject operating oil into the cylinder, and attack either one of the bumper rubber modules and the service bar receiver to the screws 3/ of the wrinkle hydraulic system. , a vehicle height adjustment device characterized in that it is configured to be movable relative to the other. (!) The vehicle height adjustment device according to claim 1, wherein a bumper rubber is attached to the piston of the hydraulic device. (3) The vehicle height adjustment device according to claim 1, wherein a rubber receiver is not attached to the piston of the hydraulic device. (4) Claim 1, wherein the oil pump of the hydraulic system is a power steering oil pump! @1
Vehicle height adjustment device described in section.