A compression hydraulic buffer structure for shock absorber

Abstract

The present invention relates to a compression hydraulic buffer structure for a shock absorber, comprising a buffer head and a buffer cylinder sleeve, wherein the buffer head comprises a buffer piston, wherein the buffer piston is fixedly arranged at one end of a piston rod located in a working cylinder, wherein the buffer cylinder sleeve is fixedly arranged in the working cylinder and is located at one end thereof close to a compression valve, wherein the buffer cylinder sleeve comprises a buffer section and a flow section, wherein the buffer section is cylindrical with one end open, wherein the open end of the buffer section faces the buffer piston, wherein the inner wall of the buffer section slides in contact with the outer wall of the buffer piston, wherein the flow section is fixedly arranged between the working cylinder and the compression valve, wherein the flow section is provided with a plurality of flow holes for connecting the compression valve with the inside of the working cylinder. The purpose of the present invention is to solve or at least alleviate the problem that the conventional shock absorber has a reduced buffering function due to spring attenuation, and to provide a compression hydraulic buffer structure for a shock absorber.

Description

Technical Field

[0001] The invention relates to the technical field of shock absorbers, and in particular to a compression hydraulic buffer structure for shock absorbers. Background Art

[0002] During the driving process of the car, the movement of the suspension will make the shock absorber piston rod and the working cylinder relative to each other, driving the hydraulic oil to flow back and forth through the restoring valve assembly and the compression valve assembly in the upper and lower chambers of the working cylinder and the oil cylinder chamber, generating damping force, absorbing the vibration energy generated by the movement of the car, and ensuring driving comfort. Due to the function of the shock absorber in the vehicle, the piston rod always makes reciprocating linear motion relative to the working cylinder. When the vehicle bounces to the upper and lower limit positions relative to the body, the shock absorber must be used to buffer and constrain the upper and lower jumping limits of the wheels. These two limit positions require the shock absorber to provide a large damping force within a very short movement distance, which is not possible with the existing restoring valve assembly and compression valve assembly. Therefore, it is necessary to add an additional buffer mechanism in the shock absorber to suppress the upper and lower jumping of the wheel limit positions to ensure the driving comfort of the car. At the same time, when the car encounters a bumpy road, the piston rod may directly impact and damage the compression valve assembly, affecting the service life of the shock absorber. Therefore, a buffer mechanism is set between the piston rod and the compression valve in some existing shock absorbers.

[0003] The internal buffer mechanism of a conventional shock absorber is generally a spring buffer, but as the use time increases, the spring is prone to attenuation, the buffering function decreases, and noise is generated, which cannot effectively solve the problem of short service life of the shock absorber buffer structure. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, solve or at least alleviate the problem of reduced buffering function of conventional shock absorbers due to spring attenuation, and provide a compression hydraulic buffer structure for shock absorbers.

[0005] The present invention is achieved through the following technical solutions:

[0006] A compression hydraulic buffer structure for a shock absorber, the shock absorber comprises an oil storage cylinder, a working cylinder, a piston rod and a compression valve, the working cylinder is sleeved in the oil storage cylinder, the piston rod is axially slidably arranged in the working cylinder, one end of the piston rod extends outward from the working cylinder and the oil storage cylinder, the working cylinder and the oil storage cylinder are connected and are both filled with hydraulic oil, the compression valve is located at one end of the oil storage cylinder away from the piston rod, and the compression hydraulic buffer structure comprises a buffer head and a buffer cylinder sleeve;

[0007] Wherein, the buffer head comprises a buffer piston, and the buffer piston is fixedly arranged at one end of the piston rod located in the working cylinder;

[0008] The buffer cylinder sleeve is fixedly arranged in the working cylinder and is located at one end thereof close to the compression valve. The buffer cylinder sleeve includes a buffer section and a flow section. The buffer section is cylindrical with one end open. The open end of the buffer section faces the buffer piston. The inner wall of the buffer section slides in contact with the outer wall of the buffer piston. The flow section is fixedly arranged between the working cylinder and the compression valve. The flow section is provided with a plurality of flow holes for connecting the compression valve with the inside of the working cylinder.

[0009] In order to further realize the present invention, the following technical solutions may be preferably selected:

[0010] Preferably, the buffer head further comprises a buffer mandrel, the upper end of which is threadedly sleeved on one end of the piston rod close to the buffer cylinder sleeve, and the lower end of which is fixedly sleeved with a buffer piston.

[0011] Preferably, an annular positioning groove is provided in the middle of the buffer core shaft, and the cross-section of the positioning groove is a right-angled triangle that is small at the top and large at the bottom. The buffer piston is fitted into the positioning groove of the buffer core shaft, and a plurality of inwardly inclined barbs are provided in a uniform circular array on the inner side of the upper end of the buffer piston, and the barbs are arranged corresponding to the positioning grooves.

[0012] Preferably, the lower end of the buffer core shaft is in an inverted T shape, and the buffer core shaft is also provided with a stop ring and a buffer cushion, the stop ring is fixedly fitted on the buffer core shaft and located above the buffer piston, and the buffer cushion is slidably fitted on the buffer core shaft and located below the buffer piston.

[0013] Preferably, a plurality of first grooves are arranged in a circumferential array on the upper end surface of the buffer pad, the first grooves are arranged radially, one end of the first grooves is connected to the outer wall of the buffer pad, and the other end is connected to the inner wall of the buffer pad, and a plurality of second grooves are arranged in a circumferential array on the outer side of the lower end surface of the buffer piston, the second grooves are arranged axially, the lower ends of the second grooves are connected to the lower end surface of the buffer piston, and the upper ends are located in the middle of the buffer piston.

[0014] Preferably, a chamfer is provided on the inner side of the upper end of the buffer section opening, and a plurality of flow grooves are provided in a circular array on the circumferential inner wall of the buffer section. The upper end of the flow groove is connected to the end face of the buffer section opening, and the lower end extends vertically downward, and the lengths of the plurality of flow grooves are different.

[0015] Preferably, the upper portion of the flow section is a truncated cone-shaped shell that is smaller at the top and larger at the bottom, and the lower portion is a circular tube, and a plurality of the flow holes are arranged in a circular array at the upper portion of the flow section.

[0016] Preferably, the outer diameter of the lower portion of the flow section is equal to the inner diameter of the working cylinder, and the lower end of the flow section is provided with an outward flange, and the lower end of the working cylinder presses the flange against the compression valve.

[0017] Through the above technical solution, the beneficial effects of the present invention are:

[0018] The present invention provides a buffer cylinder sleeve at the lower end of the working cylinder and above the compression valve, and a buffer head at the lower end of the piston rod; when the piston rod moves relative to the working cylinder to near the limit position of the compression stroke, the buffer head enters the buffer cylinder sleeve, and due to the sealing cooperation between the outer wall of the buffer piston and the inner wall of the buffer cylinder sleeve, the hydraulic buffer force in the buffer cylinder sleeve is rapidly increased, so that the shock absorber can attenuate the impact brought by the ground, improve the smoothness of the vehicle, and avoid the collision between the compression valve and the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the buffer head of the present invention;

[0021] Figure 3 It is a structural cross-sectional view of the buffer head of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the buffer piston of the present invention;

[0023] Figure 5 It is a structural schematic diagram of the cushioning pad of the present invention;

[0024] Figure 6 It is a front view of the buffer mandrel of the present invention;

[0025] Figure 7 It is a structural schematic diagram of the buffer cylinder sleeve of the present invention;

[0026] Figure 8 It is a structural cross-sectional view of the buffer cylinder sleeve of the present invention;

[0027] Among them: 1- oil storage cylinder; 2- working cylinder; 3- piston rod; 4- compression valve; 5- buffer head; 6- buffer cylinder sleeve; 7- buffer piston; 8- buffer core shaft; 9- barb; 10- stop ring; 11- buffer cushion; 601- buffer section; 602- flow section. DETAILED DESCRIPTION

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The following will be combined with the drawings in the embodiments of the invention to clearly and completely describe the technical solutions in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments of the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0030] Embodiment 1:

[0031] like Figure 1-8 As shown, a compression hydraulic buffer structure for a shock absorber, the shock absorber comprises an oil storage cylinder 1, a working cylinder 2, a piston rod 3 and a compression valve 4, the working cylinder 2 is sleeved in the oil storage cylinder 1, the piston rod 3 is axially slidably arranged in the working cylinder 2, one end of the piston rod 3 extends outward from the working cylinder 2 and the oil storage cylinder 1, the working cylinder 2 and the oil storage cylinder 1 are connected and are both filled with hydraulic oil, the compression valve 4 is located in the oil storage cylinder 1 at one end away from the piston rod 3, and the compression hydraulic buffer structure comprises a buffer head 5 and a buffer cylinder sleeve 6;

[0032] The buffer head 5 includes a buffer piston 7, and the buffer piston 7 is fixedly arranged at one end of the piston rod 3 located in the working cylinder 2;

[0033] The buffer cylinder sleeve 6 is fixedly arranged in the working cylinder 2 and is located at one end thereof close to the compression valve 4. The buffer cylinder sleeve 6 includes a buffer section 601 and a flow section 602. The buffer section 601 is cylindrical with one end open. The open end of the buffer section 601 faces the buffer piston 7. The inner wall of the buffer section 601 fits and slides with the outer wall of the buffer piston 7. The flow section 602 is fixedly arranged between the working cylinder 2 and the compression valve 4. The flow section 602 is provided with a plurality of flow holes for connecting the compression valve 4 with the inside of the working cylinder 2.

[0034] For ease of installation, in this embodiment, the buffer head 5 further includes a buffer core shaft 8, the upper end of the buffer core shaft 8 is threadedly sleeved on one end of the piston rod 3 close to the buffer cylinder sleeve 6, and the lower part is fixedly sleeved with a buffer piston 7.

[0035] In order to optimize the product structure and ensure the reliability of the buffering process, an annular positioning groove is provided in the middle of the buffer core shaft 8. The cross-section of the positioning groove is a right-angled triangle with a small upper part and a large lower part. The buffer piston 7 is sleeved on the positioning groove of the buffer core shaft 8. A plurality of inwardly inclined barbs 9 are uniformly arranged in a circular array on the inner side of the upper end of the buffer piston 7. The barbs 9 are arranged corresponding to the positioning groove. The lower end of the buffer core shaft 8 is in an inverted T shape. The buffer core shaft 8 is also provided with a retaining ring 10 and a buffering cushion 11. The retaining ring 10 is fixedly sleeved on the buffer core shaft 8 and is located above the buffer piston 7. The buffering cushion 11 is slidably sleeved on the buffer core shaft 8 and is located above the buffer piston 7. 7, a plurality of first grooves are arranged in a circumferential array on the upper end surface of the buffer pad 11, the first grooves are arranged radially, one end of the first groove is connected to the outer wall of the buffer pad 11, and the other end is connected to the inner wall of the buffer pad 11, and a plurality of second grooves are arranged in a circumferential array on the outer side of the lower end surface of the buffer piston 7, the second grooves are arranged axially, the lower end of the second groove is connected to the lower end surface of the buffer piston 7, and the upper end is located in the middle of the buffer piston 7; during assembly, the buffer pad 11, the buffer piston 7 and the stop ring 10 are successively passed onto the buffer core shaft 8, the stop ring 10 is riveted to the buffer core shaft 8, and then the buffer head 5 is tightened to the lower end of the piston rod 3.

[0036] In order to facilitate the entry of the buffer head 5, and when the buffer head 5 enters the buffer cylinder sleeve 6, the rate at which the hydraulic oil in the buffer cylinder sleeve 6 flows out of the buffer cylinder sleeve 6 can be reduced as the buffer head 5 goes deeper, a chamfer is provided on the inner side of the upper end of the opening end of the buffer section 601, and a plurality of flow grooves are provided in a circular array on the circumferential inner wall of the buffer section 601. The upper end of the flow groove is connected to the end face of the opening end of the buffer section 601, and the lower end extends vertically downward, and the lengths of the plurality of flow grooves are different.

[0037] In order to reliably fix the buffer cylinder sleeve 6 and ensure that the compression valve 4 is connected with the hydraulic oil in the working cylinder 2, the upper part of the flow section 602 is a conical shell with a small upper part and a large lower part, and the lower part is a circular tube. A plurality of flow holes are arranged in a circular array on the upper part of the flow section 602. The outer diameter of the lower part of the flow section 602 is equal to the inner diameter of the working cylinder 2. The lower end of the flow section 602 is provided with an outward flange, and the lower end of the working cylinder 2 presses the flange against the compression valve 4.

[0038] When the piston rod 3 moves downward, the buffer piston 7 and the buffer pad 11 move downward together with the buffer core shaft 8. When the buffer piston 7 enters the buffer cylinder sleeve 6, the outer diameter of the buffer piston 7 is variable, and it will shrink and become smaller under the squeezing of the inner wall of the buffer cylinder sleeve 6. At the same time, the hydraulic oil in the buffer cylinder sleeve 6 will be compressed. The hydraulic oil will flow upward in the first groove and the second groove between the buffer pad 11 and the buffer piston 7 and overflow from the flow groove of the buffer cylinder sleeve 6, thereby generating a compressed hydraulic buffer force. This buffer force will continue to increase as the piston rod 3 moves downward. The hydraulic buffer force generated by this structure can effectively suppress the impact of the wheel adjustment on the vehicle body, making the impact soft and smooth, thereby improving driving comfort.

[0039] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A compression hydraulic buffer structure for a shock absorber, the shock absorber comprising an oil storage cylinder (1), a working cylinder (2), a piston rod (3) and a compression valve (4), the working cylinder (2) being sleeved in the oil storage cylinder (1), the piston rod (3) being axially slidably arranged in the working cylinder (2), one end of the piston rod (3) extending outward from the working cylinder (2) and the oil storage cylinder (1), the working cylinder (2) and the oil storage cylinder (1) being connected and both filled with hydraulic oil, the compression valve (4) being located at one end of the oil storage cylinder (1) away from the piston rod (3), characterized in that: The compression hydraulic buffer structure comprises a buffer head (5) and a buffer cylinder sleeve (6); The buffer head (5) comprises a buffer piston (7), and the buffer piston (7) is fixedly arranged at one end of the piston rod (3) located in the working cylinder (2); The buffer cylinder sleeve (6) is fixedly arranged in the working cylinder (2) and is located at one end thereof close to the compression valve (4). The buffer cylinder sleeve (6) comprises a buffer section (601) and a flow section (602). The buffer section (601) is cylindrical with one end open. The open end of the buffer section (601) faces the buffer piston (7). The inner wall of the buffer section (601) slides in contact with the outer wall of the buffer piston (7). The flow section (602) is fixedly arranged between the working cylinder (2) and the compression valve (4). The flow section (602) is provided with a plurality of flow holes for connecting the compression valve (4) with the inside of the working cylinder (2). The inner side of the upper end of the buffer section (601) is provided with a chamfer, and the inner wall of the buffer section (601) is provided with a plurality of flow grooves in a circumferential array, the upper end of the flow grooves being connected to the end surface of the buffer section (601) opening, and the lower end extending vertically downward, and the lengths of the plurality of flow grooves are different; The upper portion of the circulation section (602) is a truncated cone-shaped shell with a small upper portion and a large lower portion, and the lower portion is a circular tube-shaped shell. A plurality of circulation holes are arranged in a circular array on the upper portion of the circulation section (602); The outer diameter of the lower portion of the flow section (602) is equal to the inner diameter of the working cylinder (2). The lower end of the flow section (602) is provided with an outward flange, and the lower end of the working cylinder (2) presses the flange against the compression valve (4).

2. A compression hydraulic buffer structure for a shock absorber according to claim 1, characterized in that The buffer head (5) also includes a buffer core shaft (8), the upper end of which is threadedly sleeved on one end of the piston rod (3) close to the buffer cylinder sleeve (6), and the lower end is fixedly sleeved with a buffer piston (7).

3. A compression hydraulic buffer structure for a shock absorber according to claim 2, characterized in that: The buffer core shaft (8) is provided with an annular positioning groove in the middle, the cross section of the positioning groove is a right triangle with a small top and a large bottom, the buffer piston (7) is sleeved in the positioning groove of the buffer core shaft (8), and a plurality of inwardly inclined barbs (9) are arranged in a uniform circumferential array on the inner side of the upper end of the buffer piston (7), and the barbs (9) are arranged corresponding to the positioning groove.

4. A compression hydraulic buffer structure for a shock absorber according to claim 3, characterized in that: The lower end of the buffer core shaft (8) is in an inverted T-shape. The buffer core shaft (8) is also provided with a stop ring (10) and a buffer cushion (11). The stop ring (10) and the buffer cushion (11) are both in annular shape. The stop ring (10) is fixedly sleeved on the buffer core shaft (8) and is located above the buffer piston (7). The buffer cushion (11) is slidably sleeved on the buffer core shaft (8) and is located below the buffer piston (7).

5. A compression hydraulic buffer structure for a shock absorber according to claim 4, characterized in that: The upper end surface of the buffer cushion (11) is provided with a plurality of first grooves in a circumferential array, the first grooves being arranged radially, one end of the first grooves being connected to the outer wall of the buffer cushion (11), and the other end being connected to the inner wall of the buffer cushion (11), and the outer side of the lower end surface of the buffer piston (7) is provided with a plurality of second grooves in a circumferential array, the second grooves being arranged axially, the lower end of the second grooves being connected to the lower end surface of the buffer piston (7), and the upper end being located in the middle of the buffer piston (7).

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