JPS58184334A - Liquid-pressure shock-absorber - Google Patents

Abstract

PURPOSE:To enable to adjust the height of a car and prevent a diaphragm from damage by partitioning a reservoir chamber by the diaphragm into a liquid chamber connected to the inside of a cylinder and an air chamber and forming an air chamber connected to the air chamber on the periphery of an outer cylinder. CONSTITUTION:A reservoir chamber 9 formed between a cylinder 1 and an outer cylinder 8 around the cylinder 1 is partitioned by a diaphragm 25 made of rubber or the like into a liquid chamber 26 connected to the cylinder 1 via a bottom body 13 and an air chamber 24 separated from the liquid chamber 26 fluid-tightly. Furthermore, the periphery of the outer cylinder 8 is provided with an air chamber 27 connected to the above-said air chamber 24 by using a spring seat 30 and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic front device used in an air suspension of a vehicle height adjustment device.

A conventional hydraulic shock absorber was constructed as shown in FIG.

That is, the communication hole 2 on the upper and lower surfaces allows limited circulation of the working liquid in one cylinder filled with the working liquid.
A piston 5 equipped with a damping force generating means 4 consisting of a pulp plate 3 that always closes the cylinder 1 is slidably inserted into the cylinder 1 to form an upper and lower double partition 6. The damping force generating means 12 includes a reservoir chamber 9 formed between the cylinder 1 and an outer cylinder 8 surrounding the cylinder 1, a communication hole 10 on the upper and lower surfaces, and a valve plate 11 that always closes the communication hole 10. Preferably, the reservoir chamber 9 is filled with a pressurized gas 14 that energizes the liquid in the reservoir chamber 9 and the cylinder 1, and the piston 5 is connected to the reservoir chamber 9 from the top of the cylinder 1. A piston rod 15 fixed to the piston rod 15 is made to protrude. Note 1
Reference numerals 6 and 17 designate check plates that always close the communication holes 18 and 19, respectively, and 20 and 21' designate springs with a weak spring force that bias the respective check plates 16 and 17.

As is well known, such a hydraulic shock absorber is mounted directly on the spring of the vehicle body at the end of the piston rod 15 by fixing the cylinder under the spring, and the extension of the piston rod 15 is During the stroke, the pressure in the upper chamber 6 becomes high, and the working liquid in the upper chamber 6 pushes open the valve plate 3 through the communication hole 2 and flows into the lower chamber 7 while creating a flow resistance, that is, a damping force. Liquid is bottom body 3
The piston rod 1 is pushed open through the hole 19 into the check plate 17YgM and flows into the cylinder 1 to compensate for the withdrawal volume of the piston rod 15. On the other hand, during the compression stroke of the piston rod 15, the liquid in the lower chamber 7 pushes up the check plate 16'4 through the communication hole 18 of the screw 5 and easily flows into the first chamber 6. , the liquid corresponding to the intrusion volume of the piston rod 15 pushes open the valve plate 11''1 from the communication hole IO of the bottom body 13, and flows into the reservoir chamber 9 while generating a flow resistance, that is, a damping force.
The D outlet gas 14 in the reservoir chamber 9 is compressed to -. In this way, the desired damping force is generated during the movement and extension stroke of the piston rod 15.

By the way, when the air suspension of the east height adjustment device is formed by using the final tension shock absorber having the above-mentioned structure, a rolling diaphragm 22 is used as shown in FIG. One end of the diaphragm 22 is fixed to the terciel 23 installed on the piston rod 15, and the other end is fixed to the outer cylinder 8 in a folded state to form an air chamber 24, which prevents flying stones. There is a drawback that the rolling diaphragm 22 is damaged due to such factors.

The present invention has been made for the purpose of providing a hydraulic loosening device that can be used as an air suspension for a vehicle height adjustment device without forming an air chamber using a rolling diaphragm, an outer shell, or the like. As shown in Figure 3, the gist of the structure is that the inside of the reservoir chamber 9 formed between the cylinder 1 and the outer cylinder 8 concavely surrounding the cylinder 1 is lengthwise. A diaphragm 25 made of rubber or the like divides the outer cylinder 8 into a liquid chamber 26 connected to the inside of the cylinder 1 via the bottom body 13 and an air chamber 24 separated from the liquid chamber 26 in a liquid-tight manner. An air chamber 27 connected to the air chamber 24 is formed on the outer periphery by using a spring seat 30 or the like.

In the row f shown in the drawing, the diaphragm 25 is formed into a cylindrical shape, with a bead portion 25a at the lower end σ) fixed between the outer cylinder 8 and the bottom body 13, and a bead portion 25b at the upper end.
is installed in the reservoir chamber 9 by being fixed between the outer cylinder 8 and the guide 82, and the inside and outside of the reservoir chamber 9 are separated, forming four liquid chambers 26, and an outer fl11.
1 to form an air chamber 24. Further, an air chamber 27 that is connected to the air chamber 24 through a communication hole 29 is formed on the outer periphery of the outer cylinder 8 by using a plate 28 . , 3o is a spring seat that forms the air chamber 27 together with the plate 28, and the spring seat 30 is provided with a feed opening 31.

When compressed air is supplied to the air chamber 27 through the air supply/exhaust port 31, the compressed air passes through the communication hole 29 to the air chamber 27.
enters the air chamber 24 and expands the diaphragm 2.
5 to the liquid chamber 26 side to increase the pressure inside the liquid chamber 26 and the cylinder, and also to increase the pressure inside the cylinder from the air supply/exhaust port 31 to the air chambers 27 and 24.
When the compressed air of
It bends to the side to lower the pressure inside the liquid chamber 26 or the cylinder. .

Therefore, by adjusting the amount of compressed air supplied to the air chambers 27.24 and controlling the internal pressure of these air chambers 27.24, F=P (air chamber pressure = cage pressure) XA (rod cross section f
ri): 1: This allows the force F to be freely set at 1°.The same reference numerals are given to the same parts as in the prior art, and redundant explanation will be omitted. .

As explained above, the present invention has a piston that is slidably inserted into a cylinder filled with a working fluid and equipped with a damping force generating means that allows limited flow of the working fluid, so that the inside of the cylinder is double-layered, upper and lower. A reservoir chamber formed between the inside of the cylinder and an outer cylinder surrounding the cylinder is communicated at its bottom via a bottom body provided with a damping force generating means, and from the top of the cylinder In a hydraulic a-impactor comprising a protruding piston rod fixed to the piston,
The reservoir chamber is further divided by a diaphragm made of rubber or the like into a liquid chamber connected to the inside of the cylinder via the bottom body, and an air chamber separated from the liquid chamber in a liquid-tight manner. Since this has an air chamber connected to the air chamber, it can be used as an air suspension for a vehicle height adjustment device without installing a rolling diaphragm on the outside of the outer cylinder as in the conventional case. This has the effect of eliminating damage to the diaphragm due to
In particular, in the present invention, since an air chamber is provided on the outside of the outer cylinder, the spring constant is correspondingly lowered, and riding comfort can be improved.

Furthermore, if the air chamber is formed by using the η opening spring seat of the embodiment, there is an effect that the air chamber can be formed to the maximum size without interference between the V9 air chamber and the tire.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a hydraulic shock absorber, Fig. 2 is a sectional view of a conventional air suspension configured by attaching a rolling diaphragm to a hydraulic damper, and Fig. 3 is a sectional view of a hydraulic blower according to the present invention. FIG. 0 l...Cylinder, 4...Damping force generating means, 5...
Piston, 6.7...Upper and lower double, 8...Outer cylinder, 9.
... Reservoir chamber, 12... Damping force generating means, 13...
・Bottom body, 15...Piston rod, 24...
・Air chamber, 25...diaphragm, 26...liquid chamber,
27...Air chamber. Figure 1

Claims (2)

[Claims] (1) A piston equipped with a damping force generating means that allows limited flow of the working liquid is slidably inserted into a cylinder filled with working liquid, so that the inside of the cylinder is divided into upper and lower layers,
A reservoir chamber formed between the inside of the cylinder and an outer cylinder surrounding the cylinder is communicated at its bottom through a bottom body equipped with a damping force generating means, and is fixed to the piston from the top of the cylinder. In the hydraulic shock absorber having a piston rod protruding from the reservoir chamber, one
A diaphragm made of rubber or the like divides the cylinder into a liquid chamber that is connected to the inside of the cylinder through the bottom body, and an air chamber that is separated from the liquid chamber in a liquid-tight manner. A hydraulic shock absorber characterized by forming an air chamber connected to a chamber. (2) The hydraulic shock absorber according to claim 1, wherein the air chamber outside the outer cylinder is formed using a spring seat.