RU117999U1 - HYDRAULIC TELESCOPIC SHOCK ABSORBER WITH GAS SUPPORT OF LOW PRESSURE - Google Patents

Abstract

A hydraulic telescopic shock absorber containing a shock absorbing fluid and a mixture of gases under pressure, a housing, a working cylinder located in the housing with a compression valve, a rod located in the working cylinder, a piston with a rebound valve and a bypass valve installed in series on the rod, a rod guide and a rod seal, characterized by that the stem seal in the form of a cuff has an outer sealing edge, which is based on the inner part on the ledge of the rod guide, and on the outer diameter contacts the shock absorber body, having an outer diameter larger than the inner diameter of the shock absorber body, elastic is installed on the cylindrical surface of the rod guide with an interference fit a check valve ring of rectangular section, which is limited from movement on one side by the ledge of the rod guide, on the other side by the end of the working cylinder, to ensure the sealing of the compensation cavity of the shock absorber on one side and allowing the shock absorber nd liquid that has got into the cavity under the cuff, flow back into the compensation cavity of the shock absorber from the other side.

Description

The invention relates to mechanical engineering, namely, to the design of hydraulic telescopic shock absorbers and struts of vehicles.

A hydraulic shock absorber with a sealing assembly consisting of a rod ring, a rod ring holder, a housing sealing element, an oil seal frame, an oil seal, a nut is known from the prior art. Above the sealing edge of the gland, a collar-type valve is made, made at the same time with the gland (RU No. 2111868 C1).

The disadvantage of this invention is the large number of parts of the seal assembly and low sealing of the shock absorber with a collar valve.

A known hydraulic shock absorber with a seal assembly made in the form of a cuff and a sleeve. The cuff consists of an elastic material forming sealing lips in contact with the shock absorber rod, and a vulcanized cuff frame made in the form of a washer contacting its inner side surface with the centering protrusion of the rod guide, a spring ring that presses the sealing lips of the cuff against the shock absorber rod. On the cuff is a check valve in the form of a collar that closes the grooves of the sleeve from the side of the tank (patent RU No. 2179668 C1).

The disadvantage of this invention is the complexity of the design of the sleeve and the difficulty of installing the cuff during assembly, due to the possibility of jamming the edges of the collar of the check valve along the landing planes, which will lead to a loss of tightness of the shock absorber.

A telescopic strut of a vehicle suspension is known in which a valve is installed between the holder of the stem ring and the stem guide and is made covering the holder and covers its openings, and with a flange located in the gap between the end face of the holder and the surface of the guide rod, facing the end and sealing this gap for tight separation of the compensation cavity and the cylinder (RU 2123433 C1).

The disadvantage is the complexity of the design and requires large manufacturing costs due to the greater number of parts.

Closest to the claimed technical solution is a hydraulic telescopic shock absorber with a seal assembly of the Boghe company (J. Raimpel, Chassis of a car. Shock absorbers, tires and wheels. M., Mechanical Engineering, 1986, p. 125, Fig. 232). The shock absorber has a rod guide with a rubber ring of circular cross-section, mounted with a radial interference in the wedge groove and preventing gas loss.

The disadvantage is the need for additional operations to produce a wedge groove, the use of a rubber O-ring mounted with a radial interference is not effective enough to prevent the loss of a mixture of gases.

The objective of the utility model is to simplify the design of a hydraulic telescopic shock absorber with low pressure gas support with a reliable check valve.

This problem is solved by changing the design of the seal assembly, which includes a cuff, a rod guide and a check valve in the form of a ring of rectangular cross section.

The cuff consists of an elastic material vulcanized to the cuff frame, forming the inner sealing lips, the outer sealing lip and the spring ring, which presses the sealing lips of the cuff against the shock absorber rod. The inner sealing edges of the cuff are in contact with the shock absorber rod, the upper edge acts as a wiper ring, and the lower edge provides sealing of the cuff with the rod. The outer sealing lip of the cuff in the inner part is based on the ledge of the rod guide, and in outer diameter is in contact with the shock absorber body, having an outer diameter larger than the inner diameter of the shock absorber body. The non-return valve is formed by an elastic ring of rectangular cross-section installed with an interference fit on the cylindrical surface of the rod guide and is designed to allow liquid to flow through the gap between the rod and the rod guide sleeve from cavity D to cavity C, on the one hand, and to hold the gas mixture under pressure in the compensation cavity C on the other hand. The check valve ring, to limit movement, abuts the upper end against the ledge of the rod guide, the lower end against the end of the working cylinder.

The rod guide consists of a housing and an anti-friction coated guide sleeve pressed into the housing. In the upper part of the housing of the rod guide on the outer surface there is a ledge for installing the cuff on the inside of the outer sealing lip. In the housing of the rod guide there are channels for connecting the cavities C and D of the shock absorber.

The inventive utility model is illustrated by drawings, in which Fig. 1 shows a shock absorber in a section, and Fig. 2 shows a cross-section of a shock absorber rod seal design.

The shock absorber (figure 1, 2) includes:

1. shock absorber housing;

2. slave cylinder;

3. compression valve;

4. stock;

5. piston;

6. rebound valve;

7. end buffer;

8. rod guide;

9. cuff;

10. check valve ring.

The proposed utility model works as follows. During compression, the rod 4 with the piston 5 moves into the working cylinder 2, the pressure under the piston in the cavity B rises and the shock absorber flows through the bypass holes in the piston 5, flows into the cavity A. Part of the volume in the cavity A during the compression takes up the rod and the excess of shock absorber from the cavity B flows into the compensation cavity C through the compression valve 3, creating a compression force.

During the rebound stroke, the rod 4 with the piston 5 extends from the working cylinder 2, the pressure above the piston in the cavity A increases and the shock-absorbing fluid flows into the cavity B through the rebate valve 6 of the piston 5, creating a rebound force. During the rebound stroke, the rod 4 ceases to occupy part of the volume in the cavity A and the shock-absorbing liquid from the compensation cavity C returns to the cavity B through the calibrated openings of the compression valve 3.

In a hydraulic telescopic shock absorber with a low pressure gas support, there is a mixture of gases under a pressure of 0.4 MPa. The gas mixture is located in the compensation chamber C to prevent foaming of the shock absorber fluid. The gas mixture in the compensation cavity C of the shock absorber is separated from the cavity D by an elastic ring of a check valve 10 of rectangular cross section, preventing the mixture of gases from entering the cavity D with subsequent leakage into the atmosphere. The elastic ring of the check valve is pressed against the cylindrical surface of the rod guide under the pressure of the gas mixture. During the operation of the shock absorber, a part of the shock absorber leaks through the gap between the rod and the rod guide into the cavity D. If the pressure of the shock absorber in the cavity D is higher than the pressure of the gas mixture in the compensation cavity C, the shock absorber presses the walls of the elastic ring of the non-return valve 10 and flows from cavity D to compensation cavity C.

Claims (1)

A hydraulic telescopic shock absorber comprising a shock absorber fluid and a mixture of pressurized gases, a housing located in the housing a working cylinder with a compression valve, a rod located in the working cylinder, a piston with a rebound valve and a bypass valve installed in series on the rod, a rod guide and a rod seal, characterized in that the stem seal in the form of a cuff has an external sealing lip, which on the inside is based on a ledge of the stem guide, and on the outer diameter is in contact with with a shock absorber housing, having an outer diameter larger than the inner diameter of the shock absorber body, an elastic rectangular check valve is installed on the cylindrical surface of the rod guide with an interference fit, which is limited from moving on one side by a ledge of the rod guide, on the other hand, with the end face of the working cylinder, to ensure compensation shock absorber cavities on one side and allowing shock absorber fluid that enters the cavity under the cuff to flow back into compensation ionic damper cavity on the other side.