Buffer

Abstract

The utility model provides a buffer. The buffer comprises a cylinder body, a piston, a piston rod and an elastic sleeve, the elastic sleeve comprises an outer cylinder part and an inner cylinder part which are integrally formed; an annular air chamber is defined between the outer barrel part and the inner side wall of the cylinder body; the annular air chamber is communicated with the outside of the cylinder body through an air path; the inner cylinder part is arranged in the outer cylinder part; a through hole is formed in the middle of the inner cylinder part; one end of the piston rod is fixedly connected with the piston, and the other end of the piston rod is sequentially inserted into the outer barrel part and the through hole and then extends out of the cylinder body; and the piston rod is hermetically connected with the through hole of the inner cylinder part. According to the utility model, the inner cylinder part is additionally arranged and is in sealed connection with the piston rod, so that a sealing structure between the piston rod and the elastic sleeve is greatly prolonged in the axial direction, viscous liquid cannot leak out through a gap between the piston rod and the elastic sleeve even if the piston rod runs for a long time, and the sealing performance and the reliability of the whole part are improved.

Description

Technical Field

[0001] This utility model relates to the field of shock absorption components, and in particular to a shock absorber. Background Technology

[0002] Currently, existing shock absorbers typically consist of a cylinder and a guide rod, with a valve plate at the head of the guide rod. The movement of this valve plate opens and closes the flow path for liquids between the pressure chamber and non-pressure chamber sides. However, existing shock absorbers have low sealing performance and reliability, and are prone to leakage after prolonged operation, leading to component malfunction. Utility Model Content

[0003] The purpose of this invention is to provide a buffer to solve at least one of the aforementioned technical problems existing in the prior art.

[0004] To solve the above-mentioned technical problems, this utility model provides a buffer, comprising: a cylinder, a piston, a piston rod, and an elastic sleeve;

[0005] The cylinder body is provided with a liquid cavity formed for sealing in a viscous liquid;

[0006] The piston is slidably disposed within the liquid chamber; the piston divides the liquid chamber into a pressure chamber and a non-pressure chamber;

[0007] The elastic sleeve is disposed within the non-pressure chamber;

[0008] The elastic sleeve includes an outer cylinder portion and an inner cylinder portion integrally formed;

[0009] An annular air chamber is formed between the outer cylinder and the inner side wall of the cylinder; the annular air chamber is connected to the outside of the cylinder through an air passage.

[0010] The inner cylinder is disposed inside the outer cylinder; at one end of the piston, the inner cylinder and the outer cylinder are integrally sealed and connected, forming an annular chamber between the inner cylinder and the outer cylinder; a through hole is provided in the middle of the inner cylinder; one end of the piston rod is fixedly connected to the piston, and the other end of the piston rod is inserted into the outer cylinder and the through hole in sequence before extending out of the cylinder body;

[0011] The piston rod is sealed to the through hole in the inner cylinder.

[0012] The elastic sleeve of this application is made of elastic material. By adding an inner cylinder, which is sealed to the piston rod, the sealing structure between the piston rod and the elastic sleeve is greatly extended in the axial direction. Even after long-term operation, viscous liquid will not leak out through the gap between the piston rod and the elastic sleeve, thus improving the sealing performance and reliability of the entire component.

[0013] Furthermore, multiple annular protrusions are spaced apart on the sidewall of the through hole to improve the sealing between the piston rod and the through hole.

[0014] The number of annular protrusions can be set as needed, preferably 3-10.

[0015] Furthermore, the length of the inner cylinder is 1 / 5 to 4 / 5 of the overall length of the outer cylinder.

[0016] Furthermore, it also includes a support and fixing component, which is a circular sleeve in shape. The support and fixing component is set in the annular air chamber and is used to fix and support the two ends of the outer cylinder of the elastic sleeve in the axial direction of the cylinder body. The middle part of the support and fixing component is hollowed out in the axial direction of the cylinder body. During the reciprocating movement of the piston in the liquid chamber, the viscous liquid enters and exits the internal cavity of the outer cylinder of the elastic sleeve, and the outer cylinder bulges or contracts accordingly, thereby adjusting the volume of the internal cavity.

[0017] The support and fixing components secure and support the two ends of the outer cylinder, thereby maintaining the airtightness of the liquid chamber and preventing the viscous liquid from leaking out through the gap between the elastic sleeve and the cylinder body; at the same time, they support and form the aforementioned annular air chamber; the middle of the support and fixing components is hollowed out, and when the outer cylinder is squeezed by the viscous liquid, it bulges outward through the hollowed-out middle, squeezing the annular air chamber, and the gas in the annular air chamber is discharged through the air passage; when the viscous liquid gradually flows out of the inner cavity of the outer cylinder, and the outer cylinder returns to its original state, the gas is drawn back into the annular air chamber through the air passage.

[0018] Furthermore, the outer cylinder portion includes an inner end near the piston; the inner port is turned outward to form an annular groove; after the inner end of the support and fixing member is inserted into the annular groove, the inner end of the outer cylinder portion abuts against the inner wall of the cylinder body.

[0019] Furthermore, a piston chamber and a sleeve chamber are sequentially arranged inside the cylinder body, the piston is reciprocally slidably arranged in the piston chamber, and the elastic sleeve is installed in the sleeve chamber;

[0020] The inner diameter of the sleeve cavity is larger than the inner diameter of the piston cavity; the sleeve cavity has an annular recess near the bottom of the piston cavity; the inner end of the support and fixing member abuts the bottom of the annular groove of the outer cylinder against the annular recess.

[0021] Furthermore, the inner end of the support and fixing member is provided with an outwardly protruding annular locking part, which abuts the outer wall of the annular groove against the inner wall of the cylinder.

[0022] Furthermore, it also includes a sealing element for sealing the cylinder opening at one end of the elastic sleeve of the cylinder body; the sealing element has a shaft hole in the middle, through which the piston rod extends out of the cylinder body.

[0023] Preferably, an air passage is provided inside the sealing member or between the sealing member and the cylinder body, connecting the inside and outside of the annular air chamber.

[0024] Furthermore, the outer end of the support and fixing member is provided with an inwardly recessed annular limiting platform, and the outer end of the elastic sleeve is provided with a limiting ring platform adapted to the annular limiting platform.

[0025] Furthermore, it also includes a pressure block, which is filled inside the outer end of the support and fixing member and between the sealing member and the elastic sleeve; after the sealing member is tightened, the limiting ring platform abuts against the annular limiting platform.

[0026] Furthermore, the outer ends of the pressure block and the elastic sleeve are fixedly connected to the outer end of the support fixing member by a snap-fit ​​structure.

[0027] Furthermore, it also includes a sphere (valve ball), and the piston is provided with a passage connecting the pressure chamber and a non-pressure chamber; the passage is provided with a ball seat structure on one side of the pressure chamber, and the sphere is movably disposed in the pressure chamber, adapted to the ball seat structure to open and close the passage or to adjust the flow rate and flow of viscous liquid through the passage by adjusting the cross-sectional size of the passage at the ball seat structure.

[0028] Furthermore, the ball seat structure is a frustoconical chamber disposed on one side of the pressure chamber on the piston.

[0029] Furthermore, the piston is provided with a limiting structure on the outer side of the frustoconical chamber near the pressure chamber to prevent the ball from completely disengaging from the piston.

[0030] Furthermore, the limiting structure is a receiving cavity communicating with the frustum-shaped chamber. The ball can be reciprocated between the frustum-shaped chamber and the receiving cavity. The receiving cavity is provided with a limiting protrusion or limiting pin at its outer edge to prevent the ball from falling off.

[0031] Furthermore, the limiting structure is a cage-like body disposed outside the frustum-shaped cavity.

[0032] Furthermore, it also includes a return spring, which is disposed in the pressure chamber, with its two ends abutting against the piston and the cylinder respectively, tending to force the piston to move towards the non-pressure chamber side.

[0033] By adopting the above technical solution, this utility model has the following beneficial effects:

[0034] The present invention provides a buffer in which the elastic sleeve is made of elastic material. By adding an inner cylinder, which is sealed to the piston rod, the sealing structure between the piston rod and the elastic sleeve is greatly extended in the axial direction. Even after long-term operation, viscous liquid will not leak out through the gap between the piston rod and the elastic sleeve, thus improving the sealing performance and reliability of the entire component. Attached Figure Description

[0035] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 A perspective view of the buffer provided for an embodiment of this utility model;

[0037] Figure 2 for Figure 1 The main view of the buffer shown;

[0038] Figure 3 for Figure 1 An exploded view of the buffer shown;

[0039] Figure 4 for Figure 2 BB section view in the middle;

[0040] Figure 5 This is a cross-sectional view of the cylinder body in this utility model;

[0041] Figure 6 This is a schematic diagram of the elastic sleeve in this utility model;

[0042] Figure 7 for Figure 6 AA section view in the middle;

[0043] Figure 8 This is a perspective view of the elastic sleeve in this utility model;

[0044] Figure 9 This is a schematic diagram of the structure of the support and fixing component in this utility model;

[0045] Figure 10 This is a perspective view of the support and fixing component in this utility model.

[0046] Figure label:

[0047] 10-Cylinder block; 11-Annular air chamber; 12-Non-pressure chamber; 13-Pressure chamber; 14-Cavity; 14a-Annular recess; 15-Piston chamber; 20-Piston; 21-Piston rod; 30-Elastic sleeve; 31-Outer cylinder; 32-Inner cylinder; 32a-Through hole; 32b-Annular protrusion; 33-Inner end; 34-Annular groove; 35-Limiting ring platform; 40-Supporting fastener; 41-Hollowed out; 42-Inner end; 42a-Annular locking part; 43-Annular limiting platform; 50-Sealing part; 51-Pressure block; 60-Spherical body; 61-Reset spring. Detailed Implementation

[0048] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0049] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0051] The present invention will be further explained below with reference to specific embodiments.

[0052] like Figure 1-2 As shown, the buffer provided in this embodiment includes: a cylinder 10, a piston 20, a piston rod 21, and an elastic sleeve 30;

[0053] The cylinder 10 is provided with a liquid cavity for sealing in a viscous liquid;

[0054] The piston 20 is slidably disposed within the liquid chamber; the piston 20 divides the liquid chamber into a pressure chamber 13 and a non-pressure chamber 12;

[0055] The elastic sleeve 30 is disposed within the non-pressure chamber 12;

[0056] The elastic sleeve 30 includes an integrally formed outer cylinder portion 31 and an inner cylinder portion 32;

[0057] An annular air chamber 11 is formed between the outer cylinder portion 31 and the inner sidewall of the cylinder body 10; the annular air chamber 11 is connected to the outside of the cylinder body 10 through an air passage.

[0058] The inner cylinder portion 32 is disposed inside the outer cylinder portion 31; at one end of the piston 20, the inner cylinder portion 32 and the outer cylinder portion 31 are integrally and sealed together, forming an annular chamber between the inner cylinder portion 32 and the outer cylinder portion 31; a through hole 32a is provided in the middle of the inner cylinder portion 32; one end of the piston rod 21 is fixedly connected to the piston 20, and the other end of the piston rod 21 is inserted into the outer cylinder portion 31 and the through hole 32a in sequence before extending out of the cylinder body 10; the piston rod 21 is sealed together with the through hole 32a of the inner cylinder portion 32.

[0059] The elastic sleeve 30 of this application is made of elastic material. By adding an inner cylinder 32, which is sealed to the piston rod 21, the sealing structure between the piston rod 21 and the elastic sleeve 30 is greatly extended in the axial direction. Even if it runs for a long time, viscous liquid will not leak out through the gap between the piston rod 21 and the elastic sleeve 30, thus improving the sealing performance and reliability of the entire component.

[0060] Furthermore, a plurality of annular protrusions 32b are spaced apart on the sidewall of the through hole 32a to improve the sealing between the piston rod 21 and the through hole 32a. The number of annular protrusions 32b can be set as needed, preferably 3-10.

[0061] The length of the inner cylinder 32 and the number of annular protrusions 32b can be adjusted to meet the requirements of sealing; preferably, the length of the inner cylinder 32 is 1 / 5 to 4 / 5 of the overall length of the outer cylinder 31.

[0062] Since the elastic sleeve 30 is made of elastic materials such as rubber, silicone or plastic, it preferably also includes a support and fixing member 40 for supporting and fixing the elastic sleeve 30. The support and fixing member 40 is generally in the shape of a circular sleeve and is disposed in the annular air chamber 11. It is used to fix and support the two ends of the outer cylinder 31 of the elastic sleeve 30 in the axial direction of the cylinder body 10. In the axial direction of the cylinder body 10, the support and fixing member 40 has a hollow 41 in the middle. During the reciprocating movement of the piston 20 in the liquid chamber, the viscous liquid enters and exits the internal cavity of the outer cylinder 31 of the elastic sleeve 30, and the outer cylinder 31 bulges or contracts accordingly, thereby adjusting the volume of the internal cavity.

[0063] The support and fixing member 40 fixes and supports the two ends of the outer cylinder 31, thereby maintaining the sealing of the liquid cavity and preventing the viscous liquid from leaking out through the gap between the elastic sleeve 30 and the cylinder 10; at the same time, it supports the formation of the aforementioned annular air chamber 11; the hollow 41 in the middle of the support and fixing member 40 causes the outer cylinder 31 to bulge outward through the hollow 41 when it is squeezed by the viscous liquid, squeezing the annular air chamber 11, and the gas in the annular air chamber 11 is discharged through the air passage; when the viscous liquid gradually flows out of the inner cavity of the outer cylinder 31, and the outer cylinder 31 recovers, the gas is drawn back into the annular air chamber 11 through the air passage.

[0064] Furthermore, the outer cylinder portion 31 includes an inner end 33 near the piston 20; the inner end 33 is turned outward to form an annular groove 34; after the inner end 42 of the support and fixing member 40 is inserted into the annular groove 34, the inner end 33 of the outer cylinder portion 31 is pressed against the inner wall of the cylinder body 10.

[0065] The piston 20 is a reciprocating moving component, thus the size of the pressure chamber 11 and the non-pressure chamber 12 in this application is dynamically changing; the inner cavity of the cylinder 10 can be sequentially divided into a piston chamber 15 and a sleeve cavity 14, the sizes of which are relatively fixed; the piston 20 is reciprocally slidably disposed in the piston chamber 15, and the elastic sleeve 30 is installed in the sleeve cavity 14. Preferably, the maximum outer diameter of the support fixing member 40 is equivalent to the inner diameter of the sleeve cavity 14 of the cylinder 10, and is relatively fixedly fitted in the sleeve cavity 14; the outer end of the support fixing member 40 fixes the outer end of the elastic sleeve 30; the inner end 42 of the support fixing member 40 supports and fixes the inner end 33 of the elastic sleeve 30, while also forcing a sealed connection between the inner end 33 of the elastic sleeve 30 and the cylinder 10.

[0066] The inner diameter of the sleeve cavity 14 is larger than the inner diameter of the piston cavity 15; the sleeve cavity 14 has an annular recess 14a at its bottom near the piston cavity 15; the inner end 42 of the support and fixing member 40 abuts the bottom of the annular groove 34 of the outer cylinder 31 against the annular recess 14a; furthermore, the inner end 42 of the support and fixing member 40 has an outwardly protruding annular locking part 42a, which abuts the outer wall of the annular groove 34 against the inner wall of the cylinder body 10. The combination of these two sealing structures greatly improves the sealing performance between the elastic sleeve 30 and the cylinder body 10.

[0067] Further preferably, this embodiment also includes a sealing member 50 for sealing the cylinder opening of the cylinder body 10 at one end of the elastic sleeve 30; preferably, the sealing member 50 is screwed onto the cylinder opening by means of threads; the sealing member 50 has a shaft hole in the middle, through which the piston rod 21 extends out of the cylinder body 10. Preferably, an air passage communicating with the inside and outside of the annular air chamber 11 is provided inside the sealing member 50 or between the sealing member 50 and the cylinder body 10.

[0068] Preferably, the outer end of the support fixing member 40 is provided with an inwardly recessed annular limiting platform 43, and the outer end of the elastic sleeve 30 is provided with a limiting ring platform 35 adapted to the annular limiting platform 43.

[0069] Furthermore, this embodiment also includes a pressure block 51, which is filled inside the outer end of the support fixing member 40 and between the sealing member 50 and the elastic sleeve 30; after the sealing member 50 is tightened, the limiting ring platform 35 abuts against the annular limiting platform 43. Preferably, the outer ends of the pressure block 51 and the elastic sleeve 30 are fixedly connected to the outer end of the support fixing member 40 by a snap-fit ​​structure, thereby allowing the elastic sleeve 30 to be pre-installed on the support fixing member 40, facilitating subsequent assembly processes and improving production efficiency.

[0070] Furthermore, this embodiment also includes a sphere 60 (valves), and the piston 20 is provided with a passage connecting the pressure chamber 11 and the non-pressure chamber 12; a ball seat structure is provided on one side of the passage in the pressure chamber 11, and the sphere 60 is movably disposed in the pressure chamber 11, adapted to the ball seat structure for opening and closing the passage or adjusting the flow rate and volume of the viscous liquid through the passage by adjusting the cross-sectional size of the passage at the ball seat structure. Preferably, the ball seat structure is a frustoconical chamber disposed on the piston 20 on one side of the pressure chamber 11.

[0071] Furthermore, the piston 20 is provided with a limiting structure on the outer side of the frustoconical chamber near the pressure chamber 11 to prevent the ball 60 from completely disengaging from the piston 20. The limiting structure can be a receiving cavity communicating with the frustoconical chamber, and the ball 60 can reciprocate between the frustoconical chamber and the receiving cavity. The receiving cavity has a limiting protrusion or limiting pin, etc., at its outer edge to prevent the ball 60 from disengaging. Alternatively, the limiting structure can be a cage-like body located outside the frustoconical chamber.

[0072] This embodiment also includes a return spring 61, which is disposed in the pressure chamber 11. The two ends of the return spring 61 abut against the piston 20 and the cylinder 10 respectively, tending to force the piston 20 to move towards the non-pressure chamber 12 side.

[0073] The elastic sleeve 30 of this utility model is made of elastic material. By adding an inner cylinder 32, which is sealed to the piston rod 21, the sealing structure between the piston rod 21 and the elastic sleeve 30 is greatly extended in the axial direction. Even if it runs for a long time, viscous liquid will not leak out through the gap between the piston rod 21 and the elastic sleeve 30, thus improving the sealing performance and reliability of the entire component.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A buffer, characterized in that, Includes: cylinder block, piston, piston rod, and elastic sleeve; The cylinder body is provided with a liquid cavity formed for sealing in a viscous liquid; The piston is slidably disposed within the liquid chamber; the piston divides the liquid chamber into a pressure chamber and a non-pressure chamber; The elastic sleeve is disposed within the non-pressure chamber; The elastic sleeve includes an outer cylinder portion and an inner cylinder portion integrally formed; An annular air chamber is formed between the outer cylinder and the inner side wall of the cylinder; the annular air chamber is connected to the outside of the cylinder through an air passage. The inner cylinder is disposed inside the outer cylinder; at one end of the piston, the inner cylinder and the outer cylinder are integrally sealed and connected, forming an annular chamber between the inner cylinder and the outer cylinder; a through hole is provided in the middle of the inner cylinder; one end of the piston rod is fixedly connected to the piston, and the other end of the piston rod is inserted into the outer cylinder and the through hole in sequence before extending out of the cylinder body; The piston rod is sealed to the through hole in the inner cylinder.

2. The buffer according to claim 1, characterized in that, Multiple annular protrusions are spaced apart on the side wall of the through hole to improve the sealing between the piston rod and the through hole.

3. The buffer according to claim 1, characterized in that, The length of the inner cylinder is 1 / 5 to 4 / 5 of the overall length of the outer cylinder.

4. The buffer according to claim 1, characterized in that, It also includes a support and fixing component, which is a circular sleeve in shape. The support and fixing component is set in the annular air chamber and is used to fix and support the two ends of the outer cylinder of the elastic sleeve in the cylinder axial direction. The middle part of the support and fixing component is hollowed out in the cylinder axial direction. During the reciprocating movement of the piston in the liquid chamber, the viscous liquid enters and exits the internal cavity of the outer cylinder of the elastic sleeve, and the outer cylinder bulges or contracts accordingly, thereby adjusting the volume of the internal cavity.

5. The buffer according to claim 4, characterized in that, The outer cylinder includes an inner end near the piston; the inner port is turned outward to form an annular groove; after the inner end of the support and fixing member is inserted into the annular groove, the inner end of the outer cylinder abuts against the inner wall of the cylinder.

6. The buffer according to claim 5, characterized in that, The cylinder body is provided with a piston chamber and a sleeve chamber in sequence. The piston is reciprocally slidably disposed in the piston chamber, and the elastic sleeve is installed in the sleeve chamber. The inner diameter of the sleeve cavity is larger than the inner diameter of the piston cavity; the sleeve cavity has an annular recess near the bottom of the piston cavity; the inner end of the support and fixing member abuts the bottom of the annular groove of the outer cylinder against the annular recess.

7. The buffer according to claim 5 or 6, characterized in that, The inner end of the support and fixing member is provided with an outwardly protruding annular locking part, which abuts the outer wall of the annular groove against the inner wall of the cylinder.

8. The buffer according to claim 4, characterized in that, It also includes a sealing element for sealing the cylinder opening at one end of the elastic sleeve of the cylinder body; the sealing element has a shaft hole in the middle, through which the piston rod extends out of the cylinder body.

9. The buffer according to claim 8, characterized in that, An air passage connecting the inside and outside of the annular air chamber is provided inside the sealing component or between the sealing component and the cylinder body.

10. The buffer according to claim 9, characterized in that, The outer end of the support and fixing member is provided with an inwardly recessed annular limiting platform, and the outer end of the elastic sleeve is provided with a limiting ring platform that is adapted to the annular limiting platform.

11. The buffer according to claim 10, characterized in that, It also includes a pressure block, which is filled inside the outer end of the support and fixing member and between the sealing member and the elastic sleeve; after the sealing member is tightened, the limiting ring platform abuts against the annular limiting platform.

12. The buffer according to claim 11, characterized in that, The outer ends of the pressure block and the elastic sleeve are fixedly connected to the outer end of the support fastener via a snap-fit ​​structure.

13. The buffer according to claim 1, characterized in that, It also includes a sphere, and the piston is provided with a passage connecting the pressure chamber and a non-pressure chamber; a ball seat structure is provided on one side of the pressure chamber of the passage, and the sphere is movably disposed in the pressure chamber, adapted to the ball seat structure for opening and closing the passage or adjusting the flow rate and flow of viscous liquid through the passage by adjusting the cross-sectional size of the passage at the ball seat structure.

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