JPH0139606Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of the Invention) The present invention relates to an oil spill prevention device in a vehicle height adjustment system.

(Prior Art) A vehicle height adjustment system is known in which compressed air is supplied to an air chamber in a damper to raise the vehicle height, or air is discharged from the air chamber to the outside to lower the vehicle height.

In such a system, when the vehicle height is lowered by discharging air from the air chamber of the damper while the vehicle is running, as the damper moves, oil scattered inside the damper is released into the piping outside the damper. As a result, the performance of the damper itself deteriorates,
The relief hole becomes clogged with oil, causing a problem in which the vehicle height cannot be adjusted properly.

(Purpose of the invention) The present invention was made to effectively eliminate the above-mentioned problems, and its purpose is to prevent the oil from flowing out from within the vehicle height adjustable damper, thereby reducing the performance of the damper. To provide an oil spill prevention device in a vehicle height adjustment system that prevents oil leakage and stably achieves desired vehicle height adjustment.

(Structure of the invention) In order to achieve the above object, the present invention provides a tank separate from the vehicle height adjustable damper which has an air chamber inside, and the upper part of the tank is provided with a tank for directing air from the damper body to the tank side. A check valve that allows air to flow from the tank to the damper body side is provided at the bottom, and the upper and lower parts of these tanks communicate with the air chamber inside the damper, and the tank was connected to a compressed air supply source to construct the device of the present invention.

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

The drawing is a partially cutaway side view of the oil spill prevention device according to the present invention, and in the drawing, 1 is a vehicle height adjustable damper. A piston rod 3 is inserted into the cylinder 2 of this vehicle height adjustable damper 1 from above,
A piston (not shown) is connected to the lower end of the piston rod 3 and is fitted onto the inner periphery of the cylinder 2 so as to be vertically slidable. A cylindrical case 4 is connected to the upper end of the piston rod 3, and an oil seal 5 that slides on the outer periphery of the cylinder 2 is fitted and held on the inner periphery of the lower part of the case 4. Therefore, oil is sealed inside the cylindrical case 4, and the case 4
An air chamber S is formed in the inner upper part.

On the other hand, numeral 10 in the figure is a tank provided separately from the damper 1, and check valves 13 and 14 are provided at the top and bottom of the tank 10, respectively, to be accommodated in valve cases 11 and 12. and,
The valve cases 13 and 14 are connected to the air chamber S of the damper 1 via hoses 15 and 16.
Also, nozzles 17 and 1 are located inside the valve cases 11 and 12.
It communicates with the inside of the tank 10 via 8.

By the way, the check valve 13 allows air to flow from the air chamber S to the tank 10 side, and the check valve 14 allows air to flow from the tank 10 to the air chamber S side. Further, the inside of the tank 10 communicates with a compressed air supply section (not shown) via a nozzle 19 and a hose 20.

Therefore, when lowering the vehicle height, by lowering the internal pressure of the tank 10, the air in the air chamber S of the damper 1 passes through the hose 15, uses that pressure to push open the check valve 13, and enters the tank 10 from the nozzle 17. It gushes out vigorously. At this time, the oil contained in the air is also blown out into the tank 10 along with the air.
It collides with the lower wall of the tank 10 and condenses, and the tank 10
Accumulates inside. In this case, check valve 14
is closed.

When lowering the vehicle height by discharging the air in the air chamber S as described above, the oil contained in the air is separated in the tank 10, and then the oil contained in the air is separated in the tank 10.
Since it is stored in the inner lower part and does not flow out to the outside, it does not cause a decrease in the performance of the damper 1 itself, and it does not cause the conventional relief hole to be clogged with oil, making it impossible to make the desired adjustment. Its occurrence is prevented.

In addition, if the vehicle height increases without supplying compressed air due to unevenness on the road surface while driving, the air chamber S becomes negative pressure, the check valve 14 is pulled and opened, and the lower part of the tank 10 is The accumulated oil is returned to the case 4. Therefore, the absolute amount of oil can be ensured.

Next, in order to raise the vehicle height, compressed air at a predetermined pressure is supplied into the tank 10 from the compressed air supply source through the hose 20 and the nozzle 19, and the compressed air pushes the check valve 14 open with its pressure. Then, when this check valve 14 opens,
First, the oil accumulated in the lower part of the tank 10 is returned to the case 4 via the hose 16, and then compressed air is supplied into the air chamber S, and the piston rod 3 extends upward relative to the cylinder 2, increasing the vehicle height. is adjusted high.

(Effects) As is clear from the above explanation, according to the present invention, apart from the vehicle height adjustable damper, a tank is provided to separate the oil contained in the air and store it in the lower part, so that Oil is prevented from leaking to the outside, and as a result, damper performance is prevented from deteriorating and the desired vehicle height adjustment can be achieved stably.

[Brief explanation of drawings]

The drawing is a partially cutaway side view of the oil spill prevention device according to the present invention. In addition, in the drawing, 1 is a vehicle height adjustable damper, 2 is a cylinder, 3 is a piston rod, 4 is a cylindrical case,
10 is a tank, 13 and 14 are check valves, 1
5, 16, and 20 are hoses, 17, 18, and 19 are nozzles, and S is an air chamber.

Claims (1)

[Scope of utility model registration request] A tank is provided separately from the height-adjustable damper, which has an air chamber inside, and a check valve is installed at the top of the tank to allow air to flow from the damper body to the tank, and at the bottom is a check valve that allows air to flow from the tank to the damper. A check valve is provided to allow air to flow toward the main body side, and the upper and lower parts of these tanks are connected to an air chamber in the damper, and the tanks are connected to a compressed air supply source. Oil spill device in vehicle height adjustment system.