Shock absorber recovery hydraulic buffer structure

Abstract

A recovery hydraulic buffer structure of a shock absorber belongs to the technical field of shock absorption and comprises a guider, a buffer cylinder sleeve, a working cylinder and a piston rod with a piston, the buffer cylinder sleeve is in interference fit with the working cylinder and is provided with an oil discharge groove communicated with the outside of the buffer cylinder sleeve, and an oil discharge hole communicated with the inside of the buffer cylinder sleeve is arranged in the oil discharge groove. The guider and the piston rod are matched with the buffering cylinder sleeve and the piston rod to define an annular space, the piston rod carries the piston to change the size of the annular space, and then the oil flow area inside and outside the buffering cylinder sleeve is changed, so that the buffering force is changed, the conception is novel, the design is ingenious, and the structure is simple. And stable, efficient and enough buffering force can be provided for the piston rod.

Description

Technical Field

[0001] The utility model belongs to the technical field of vibration reduction, in particular to a recovery hydraulic buffer structure of a shock absorber. Background Art

[0002] When a car is driving, facing varying road conditions such as potholes and speed bumps, its suspension system experiences frequent up-and-down vibrations. During this process, relative motion occurs between the piston rod and the working cylinder within the shock absorber, driving fluid smoothly through the return and compression valve assemblies, creating a dynamic oil chamber. This mechanism effectively generates damping force, absorbing the vibration energy generated by the vehicle while driving, significantly enhancing driving stability and comfort.

[0003] Shock absorbers not only ensure that the piston rod maintains a precise linear motion trajectory relative to the cylinder, but also demonstrate rapid and powerful response when the vehicle experiences violent bouncing and reaches its upper and lower limits, quickly providing sufficient damping force to curb the wheel's violent up and down movement. Therefore, to further enhance driving stability and comfort, it is necessary to integrate innovative buffering devices within the shock absorbers to effectively suppress unstable wheel bouncing at extreme positions, providing drivers with a more secure and enjoyable driving experience.

[0004] However, this new type of buffer device has also found new problems when it was put into use. The shock absorber recovery buffer structure generally relies on springs or cushions as buffering media. However, these components are prone to attenuation under long-term use, which not only weakens the buffering efficiency, but also may cause noise and damage. What is particularly critical is that when the shock absorber reaches the limit of the lower jump position, the existing buffer elements cannot provide sufficient buffering force and it is difficult to meet the high buffering force requirements, thereby accelerating the wear process of the shock absorber and shortening its overall service life. For example, the prior art CN 112855829 A discloses a recovery hydraulic buffer structure for a shock absorber, which can increase the oil discharge resistance when the piston rod moves with a large stroke, thereby slowing down the movement speed of the piston rod. However, the structure is complex, and the manufacturing precision and sealing requirements are very high. The complexity of the structure will affect the quality of the product. In view of this, it is urgent to develop an innovative recovery hydraulic buffer structure to effectively overcome the above limitations. Utility Model Content

[0005] In order to solve the deficiencies of the prior art, the utility model proposes a shock absorber recovery hydraulic buffer structure with large energy absorption and stable action.

[0006] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0007] A shock absorber recovery hydraulic buffer structure is arranged in the working cylinder of the shock absorber, including a buffer cylinder sleeve fixed on the inner wall of the working cylinder and interference fit therewith, a piston rod arranged inside the buffer cylinder sleeve, and a piston is arranged on the piston rod. In the utility model, the outer side surface of the buffer cylinder sleeve is provided with at least one axial groove as an oil unloading groove, which extends to the rear end of the buffer cylinder sleeve. Oil unloading holes are distributed in the oil unloading groove, and the oil unloading holes pass through the inner and outer walls of the buffer cylinder sleeve. The piston can move in and out freely along the inner wall of the buffer cylinder sleeve and seal with it. The front end of the buffer cylinder sleeve is blocked with a guide, and a stop ring is fixedly provided behind the piston on the piston rod. The outer wall of the stop ring is clearance-fitted with the inner wall of the buffer cylinder sleeve.

[0008] In the present invention, the guide is arranged at the front end of the buffer cylinder sleeve, is sleeved on the piston rod, is sealed with the piston rod, has a clearance with the inner wall of the buffer cylinder sleeve, is fixedly connected to the end of the buffer cylinder sleeve, and is fixedly connected to the inner wall of the working cylinder.

[0009] In the present invention, the inner wall of the rear end of the buffer cylinder sleeve is arranged to be an inclined surface, and the inner diameter of the end portion is smaller than the inner diameter of the interior of the buffer cylinder sleeve.

[0010] Furthermore, the inner wall of the rear part of the buffer cylinder sleeve is provided with a plurality of oil guide grooves, the length of the oil guide grooves is greater than the length of the inclined surface, the outer opening of the oil guide grooves is on the rear end face of the buffer cylinder sleeve, and the inner end of the oil guide grooves is a conical, elliptical or arc-shaped inclined surface.

[0011] In the present invention, the piston is provided with a cushion in front of the piston rod. The cushion is sleeved on the piston rod, and one side of the cushion is connected to the front end of the piston.

[0012] In the present invention, the buffer cylinder sleeve and the piston rod, as well as the guide and the piston form an annular space, which is connected to the outside of the piston through the oil unloading hole and the oil unloading groove. As the piston rod is pushed and pulled, the piston continuously changes the number of oil unloading holes connecting the annular space with the outside world, thereby changing the flow channel area connecting the annular space with the outside world. That is, the more the piston rod is pushed forward, the more oil unloading holes the piston blocks, the smaller the flow channel area, and the greater the resistance brought to the piston rod by the oil unloading holes, and vice versa.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] This application effectively changes the buffering force on the piston rod during extension and retraction by changing the oil flow area before and after the piston, thereby increasing the damping force when the piston rod moves to the near end point during a long stroke, and effectively improving the shock absorption effect;

[0015] The fixed connection between the guide and the working cylinder, the sealed movable connection between the guide and the piston rod, the fixed connection between the piston and the retaining ring and the piston rod, and the sealed movable connection between the piston and the buffer cylinder sleeve of the present invention effectively ensure the working environment of the annular space and the flow channel of the oil, with a simple structure but good coordination effect;

[0016] The inclined surface and oil guide groove provided on the inner wall of the buffer cylinder sleeve of the present application can effectively guide the piston when entering the buffer cylinder sleeve, thereby reducing the wear of the piston and increasing the service life;

[0017] When the annular space of the present application is compressed to the point where there is no oil unloading hole, it can provide unlimited resistance. At the same time, the soft pad at the front end of the piston can also effectively protect the piston and sealing structure inside the buffer cylinder sleeve.

[0018] Therefore, the utility model has a novel concept, an ingenious design, and a simple structure, and can provide a stable, efficient, and sufficiently powerful buffering force for the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the buffer cylinder sleeve of the present utility model.

[0021] In the figure: guide 1, buffer cylinder sleeve 2, working cylinder 3, cushion 4, piston 5, retaining ring 6, piston rod 7, oil unloading hole 8, oil unloading groove 9, oil guide groove 10. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but the scope of protection of the present invention is not limited thereby.

[0023] A shock absorber recovery hydraulic buffer structure, such as Figure 1 As shown, it includes a guide, a buffer cylinder sleeve, a working cylinder and a piston rod. The buffer cylinder sleeve is arranged on the inner wall of the working cylinder and has an interference fit therewith. The guide is arranged at the front end of the buffer cylinder sleeve, has a clearance fit with the inner wall of the buffer cylinder sleeve, is fixedly connected to the end of the buffer cylinder sleeve, and is fixedly connected to the inner wall of the working cylinder. The piston rod is passed through the buffer cylinder sleeve and is sealed with the guide. A piston, a stop ring and a cushion are provided on the piston rod. The piston is arranged in front of the stop ring, and it and the stop ring are respectively fixedly connected to the piston rod. The cushion is arranged in front of the piston, and its rear side is connected to the front end of the piston. The piston is sealed with the inner wall of the buffer cylinder sleeve, and the outer wall of the stop ring has a clearance fit with the inner wall of the buffer cylinder sleeve. The buffer cylinder sleeve and the piston rod, as well as the guide and the piston form an annular space.

[0024] Buffer cylinder sleeve Figure 2As shown, four circumferential grooves are provided on its outer side surface, which are oil unloading grooves. The oil unloading grooves extend to the rear end of the buffer cylinder sleeve. Oil unloading holes are distributed in the oil unloading grooves. The oil unloading holes pass through the inner and outer walls of the buffer cylinder sleeve. The annular space is connected to the outside of the piston through the oil unloading holes and the oil unloading grooves; the inner wall of the rear end of the buffer cylinder sleeve is set to be inclined, and the inner diameter of the end is smaller than the inner diameter of the inside of the buffer cylinder sleeve. A number of oil guide grooves are provided on the inner wall of the rear part of the buffer cylinder sleeve. The length of the oil guide groove is greater than the length of the inclined surface. The outer opening of the oil guide groove is on the rear end face of the buffer cylinder sleeve, and the inner end of the oil guide groove is an elliptical inclined surface.

[0025] The present invention is applied to automobile shock absorbers. The piston rod carries the piston into the buffer cylinder sleeve and abuts against the inner wall of the buffer cylinder sleeve, forming a high-pressure zone between the working cylinder and the piston rod. The oil can only flow out through the oil discharge holes and the oil discharge groove. If the distance the piston rod carries the piston into the buffer cylinder sleeve is short, the number of oil discharge holes blocked by the piston is small, the oil discharge flow area is large, the oil flow resistance is small, and the hydraulic buffering force provided to the piston rod is small. At this time, the damping force of the piston rod extension is small, and the piston rod can move freely and smoothly. If the piston rod continues to move upward, the distance it carries the piston into the buffer cylinder sleeve becomes longer and longer, the number of oil discharge holes blocked by the piston increases, the oil discharge flow area becomes smaller and smaller, the oil flow resistance becomes greater and greater, the hydraulic buffering force provided to the piston rod becomes greater and greater, and the speed at which the piston rod can move becomes slower and slower. If there are almost no oil discharge holes in the annular space between the piston and the buffer cylinder sleeve, the oil discharge can hardly flow out of the annular space and the piston, and the oil in the annular space is almost impossible to compress, then a large hydraulic buffering force is provided. At this time, the damping force of the piston rod extension is extremely large, and the piston rod is almost unable to move.

[0026] In addition, the oil unloading holes in this embodiment can be replaced by long strip-shaped slits distributed along the oil unloading groove, which can achieve similar or identical effects.

[0027] In summary, combined with the above structure and working process, it can be found that the shock absorber recovery hydraulic buffer structure proposed in this application has novel conception, ingenious design, simple structure, and can provide the piston rod with stable, efficient and sufficient buffering force.

Claims

1. A shock absorber recovery hydraulic buffer structure, disposed in a working cylinder of the shock absorber, comprising a buffer cylinder sleeve fixed to the inner wall of the working cylinder in an interference fit therewith, a piston rod disposed within the buffer cylinder sleeve, and a piston disposed on the piston rod, characterized in that: The outer side surface of the buffer cylinder sleeve is provided with at least one axial groove as an oil unloading groove, which extends to the rear end of the buffer cylinder sleeve. Oil unloading holes are distributed in the oil unloading groove, and the oil unloading holes pass through the inner and outer walls of the buffer cylinder sleeve. The piston can freely move in and out along the inner wall of the buffer cylinder sleeve and seal with it. The front end of the buffer cylinder sleeve is blocked with a guide, and a stop ring is fixedly provided behind the piston on the piston rod. The outer wall of the stop ring is clearance-matched with the inner wall of the buffer cylinder sleeve.

2. The hydraulic buffer structure according to claim 1, characterized in that: The guide is arranged at the front end of the buffer cylinder sleeve, sleeved on the piston rod, sealed with the piston rod, gapped with the inner wall of the buffer cylinder sleeve, fixedly connected to the end of the buffer cylinder sleeve, and fixedly connected to the inner wall of the working cylinder.

3. The hydraulic buffer structure according to claim 1, characterized in that: The inner wall of the rear end of the buffer cylinder sleeve is arranged to be an inclined surface, and the inner diameter of the end portion is smaller than the inner diameter of the inside of the buffer cylinder sleeve.

4. The hydraulic buffer structure according to claim 3, characterized in that: The inner wall of the rear part of the buffer cylinder sleeve is provided with a plurality of oil guide grooves, the length of the oil guide grooves is greater than the length of the inclined surface, the outer opening of the oil guide grooves is on the rear end face of the buffer cylinder sleeve, and the inner end of the oil guide grooves is a conical, elliptical or arc-shaped inclined surface.

5. The hydraulic buffer structure according to claim 1, characterized in that: The piston is provided with a cushion in front of the piston rod. The cushion is sleeved on the piston rod, and one side of the cushion is connected to the front end of the piston.

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