CN215861470U

CN215861470U - Hydraulic shock absorber for automobile

Info

Publication number: CN215861470U
Application number: CN202121454284.3U
Authority: CN
Inventors: 杨代均
Original assignee: Chongqing Biaochi Auto Parts Co ltd
Current assignee: Chongqing Biaochi Auto Parts Co ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2022-02-18
Anticipated expiration: 2031-06-29

Abstract

The utility model discloses an automobile hydraulic shock absorber which comprises a hydraulic cylinder, wherein an inner cavity of the hydraulic cylinder comprises a first oil pressure cavity and a second oil pressure cavity, the first oil pressure cavity and the second oil pressure cavity are communicated with each other, a matched piston mechanism is arranged in the hydraulic cylinder, the piston mechanism comprises a piston rod and a piston body connected to the piston rod, the piston rod drives the piston body to reciprocate in the hydraulic cylinder, a connecting plate is arranged at a connecting part of the first oil pressure cavity and the second oil pressure cavity, one end, opposite to the piston body, of the piston rod is connected to the connecting plate, a pressure release valve is arranged in the center of the connecting plate, and a pressure release hole is formed in the edge, connected with the connecting plate, of the pressure release valve. According to the utility model, the pressure release valve is arranged between the first oil pressure cavity and the second oil pressure cavity, so that pressure release can be realized when the piston is compressed at the highest speed due to sudden reduction of the distance between the wheel and the vehicle body, and the hydraulic cylinder is prevented from being over-hard.

Description

Hydraulic shock absorber for automobile

Technical Field

The utility model relates to the field of automobile parts, in particular to an automobile hydraulic shock absorber.

Background

Hydraulic damping is a common damping mode in the field of automobiles. The automobile shock absorber is generally provided with a shock absorber piston, a piston rod of the shock absorber piston and a shock absorber shell are respectively arranged on an automobile body and a wheel assembly, when the automobile vibrates up and down in the running process, the piston reciprocates in a piston cylinder, when the piston is in a compression state, the piston rod drives the piston to enter the piston cylinder, the piston compresses the volume of an oil cavity at the lower part of the piston, part of oil in the oil cavity at the lower part of the piston reversely flows to the oil cavity above the piston through the surface of the piston or/and a channel of a flow passing groove, and the other part of oil flows to an external oil cavity consisting of the piston cylinder and the shock absorber shell through a channel in a bottom valve arranged at the bottom of the piston cylinder. When the piston is restored, the piston rod pulls the piston to move towards the opening of the piston cylinder, at the moment, the piston compresses the volume of the upper oil cavity of the piston, part of oil in the upper oil cavity of the piston reversely flows to the oil cavity below the piston through the surface of the piston or/and the channel of the overflowing groove, the volume of the lower oil cavity of the piston is increased due to the fact that the piston is far away from the bottom valve, oil pressure in the lower oil cavity of the piston is reduced, the oil pressure of the external oil cavity enables the bottom valve to be opened, and the oil in the external oil cavity is quickly supplemented into the piston cylinder through the channel of the bottom valve and the oil channel after the bottom valve is opened. Thereby playing a role of shock absorption.

In the prior art, the moving amplitude of a piston rod in an automobile shock absorber is directly proportional to the vibration amplitude degree of an automobile, namely the larger the vibration amplitude of the automobile is, the faster the reciprocating speed of the piston is, and the faster the speed of the piston through which hydraulic oil flows is. When the automobile passes through a bumpy road surface at a high speed in the driving process, the distance between the wheels and the automobile body is suddenly reduced, and people in the automobile feel that the automobile is damped to be 'hardened', so that a large bumpy feeling is caused, and passengers feel uncomfortable.

In the above case, the reason why the automobile shock absorber "hardens" is that: when the distance between the wheel and the vehicle body is suddenly reduced, the piston is compressed at the highest speed, the piston rod can drive the piston to enter the piston cylinder at the highest speed, and oil originally located in the oil cavity below the piston cannot flow into the oil cavity above the piston through the overflowing hole in the piston at the same speed, so that the first section of damping force is generated at the piston. In addition, when the piston rod enters the piston cylinder, along with the gradual increase of the length of the piston rod entering the piston cylinder, the volume of an oil cavity occupied by the volume of the piston rod is gradually increased, and at the moment, the rate of oil liquid with the same volume as the piston rod flowing into an external oil chamber through a bottom valve normally-open channel is far less than the rate of the piston rod entering the piston cylinder, so that a second section of damping force is formed at the bottom valve at the bottom of the piston cylinder, and the occurrence of the automobile shock absorption hardening condition is caused due to the existence of the two sections of damping forces. In the prior art, the effect of controlling the flow of the hydraulic oil when the pressure changes greatly in a short time can be realized through an electric control system, but the electric control system is expensive and the control process is complex. Therefore, the design of the automobile hydraulic shock absorber which effectively relieves the damping force at the piston and the bottom valve during the extreme-speed compression of the piston becomes a problem to be solved urgently at present.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model aims to provide a hydraulic shock absorber for an automobile aiming at the defects of the prior art.

The technical scheme is as follows: the utility model discloses an automobile hydraulic shock absorber which comprises a hydraulic cylinder, wherein an inner cavity of the hydraulic cylinder comprises a first oil pressure cavity and a second oil pressure cavity, the first oil pressure cavity and the second oil pressure cavity are communicated with each other, a matched piston mechanism is arranged in the hydraulic cylinder, the piston mechanism comprises a piston rod and a piston body connected to the piston rod, the piston rod drives the piston body to reciprocate in the hydraulic cylinder, a connecting plate is arranged at the connecting part of the first oil pressure cavity and the second oil pressure cavity, one end, opposite to the piston body, of the piston rod is connected to the connecting plate, a pressure release valve is arranged in the center of the connecting plate, and a pressure release hole is formed in the edge, connected with the connecting plate, of the pressure release valve.

Preferably, the opening pressure threshold of the pressure relief valve is 2 MPa.

Preferably, the inner diameter of the pressure relief hole at one end facing the first hydraulic chamber is 0.8mm, and the inner diameter of the pressure relief hole at one end facing the second hydraulic chamber is 0.2 mm.

Preferably, the piston rod is provided with an overflow channel communicated with the pressure relief hole.

Compared with the prior art, the utility model has the following beneficial effects: be equipped with the relief valve between first oil pressure chamber and second oil pressure chamber, cause the piston extremely fast compression when wheel and automobile body distance diminishes suddenly, the relief valve can realize the pressure release when the hydraulic oil pressure between first oil pressure chamber and the second oil pressure chamber rises rapidly, avoids the pneumatic cylinder to take place the state of hardening excessively.

Drawings

Fig. 1 is a schematic cross-sectional view of a hydraulic shock absorber for an automobile according to the present invention.

In the figure: 1. a hydraulic cylinder; 2. a first oil pressure chamber; 3. a second oil pressure chamber; 4. a connecting plate; 5. a pressure relief valve; 6. a pressure relief vent; 7. a piston rod; 8. a piston body.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

The utility model provides an automobile hydraulic shock absorber, including

pneumatic cylinder

1, 1 inner chamber of pneumatic cylinder includes first oil pressure chamber 2 and second oil pressure chamber 3, first oil pressure chamber 2 and second oil pressure chamber 3 communicate each other, be equipped with complex piston mechanism in the pneumatic cylinder 1, piston mechanism includes piston rod 7 and connects the piston body 8 on piston rod 7, piston rod 7 drives piston body 8 reciprocating motion in pneumatic cylinder 1, the connecting portion department in first oil pressure chamber 2 and second oil pressure chamber 3 is equipped with connecting plate 4, piston rod 7 is connected on connecting plate 4 in the one end of piston body 8 mutually on the back of the body, relief valve 5 has been seted up at the connecting plate 4 center, the border department that relief valve 5 and connecting plate 4 are connected is equipped with pressure release hole 6. The technical scheme has the advantages that the pressure release valve 5 is arranged between the first oil pressure cavity 2 and the second oil pressure cavity 3, the piston is compressed at the highest speed when the distance between the wheel and the vehicle body is suddenly reduced, the pressure release valve 5 can realize pressure release when the pressure of hydraulic oil between the first oil pressure cavity 2 and the second oil pressure cavity 3 is rapidly increased, and the hydraulic cylinder 1 is prevented from being in an over-hard state. The pressure relief hole 6 is provided to meet the pressure relief requirement during the retarded oscillation.

The weight of the conventional household vehicle is about one ton generally, one ton is taken for calculation, the sectional area of the cylinder of the hydraulic shock absorber for the conventional household vehicle is 2500 square millimeters, the pressure in the cylinder is about 1MPa during normal running, and therefore the threshold value of the opening pressure of the pressure release valve 5 is set to be 2 MPa.

The specific dimensions of the pressure relief holes 6 are set as follows: the inner diameter of the pressure relief hole 6 facing the first oil pressure chamber 2 is 0.8mm, and the inner diameter of the pressure relief hole facing the second oil pressure chamber 3 is 0.2 mm.

An overflow channel communicated with the pressure relief hole 6 is formed in the piston rod 7 and is used for being matched with the conventional pressure relief effect of the pressure relief hole 6.

In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides an automobile hydraulic shock absorber which characterized in that: the hydraulic cylinder comprises a hydraulic cylinder, the hydraulic cylinder inner chamber includes first oil pressure chamber and second oil pressure chamber, first oil pressure chamber and second oil pressure chamber communicate each other, be equipped with complex piston mechanism in the hydraulic cylinder, piston mechanism includes piston rod and the piston body of connection on the piston rod, the piston rod drives piston body reciprocating motion in the hydraulic cylinder, the connecting portion department in first oil pressure chamber and second oil pressure chamber is equipped with the connecting plate, the piston rod is connected on the connecting plate in the one end of piston body mutually in an opposite direction, the relief valve has been seted up at the connecting plate center, the border department that the relief valve is connected with the connecting plate is equipped with the pressure release hole.

2. The hydraulic shock absorber for automobile according to claim 1, wherein: and the opening pressure threshold of the pressure release valve is 2 MPa.

3. The hydraulic shock absorber for automobile according to claim 1, wherein: the inner diameter of one end, facing the first oil pressure cavity, of the pressure relief hole is 0.8mm, and the inner diameter of one end, facing the second oil pressure cavity, of the pressure relief hole is 0.2 mm.

4. The hydraulic shock absorber for automobile according to claim 1, wherein: and the piston rod is provided with an overflow channel communicated with the pressure relief hole.