A buffer

Abstract

The utility model provides a kind of buffer, it includes cylinder, piston, intermediate sealing sleeve and elastic sleeve;Cylinder is provided with the chamber for enclosing viscous liquid inside;Piston is slidably arranged in chamber;Piston divides chamber into pressure chamber on the side away from piston rod and non-pressure chamber on the side of piston rod;Elastic sleeve and intermediate sealing sleeve are arranged in non-pressure chamber;Intermediate sealing sleeve is provided with long hole in the middle;Piston rod extends out of cylinder through long hole;Piston rod and long hole are sealed and relatively slidably connected;Elastic sleeve is sleeved outside intermediate sealing sleeve, and enclosed between the inner side wall of cylinder, forming an annular air chamber;Annular air chamber is communicated with the outside of cylinder through gas path.The intermediate sealing sleeve and elastic sleeve of the present application are made separately, and are relatively independently arranged, thereby greatly reducing the complexity and manufacturing cost of individual components;The reliability of each component is also greatly increased;The sealing property of the overall buffer structure is also increased.

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 on both the pressure chamber and non-pressure chamber sides. However, existing shock absorbers suffer from low sealing and reliability, and are prone to leakage after prolonged operation, leading to component malfunction. Furthermore, components such as the elastic sleeve have complex structures, high manufacturing costs, and poor reliability. 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, an intermediate sealing sleeve, and an elastic sleeve; The cylinder body is provided with a chamber for sealing in viscous liquid; The piston is slidably disposed in the chamber; the piston divides the chamber into a pressure chamber on the side opposite to the piston rod and a non-pressure chamber on the side opposite to the piston rod; the elastic sleeve and the intermediate sealing sleeve are disposed in the non-pressure chamber; The intermediate sealing sleeve has an elongated hole in the middle; the piston rod extends out of the cylinder body through the elongated hole; the piston rod and the elongated hole are sealed and can slide relative to each other; The elastic sleeve is fitted outside the intermediate sealing sleeve, forming an annular air chamber between itself and the inner wall of the cylinder; the annular air chamber is connected to the outside of the cylinder through an air passage.

[0005] The intermediate sealing sleeve is made of plastic, resin, or non-metallic materials such as polyoxymethylene (POM), or metal materials such as stainless steel. Preferably, the intermediate sealing sleeve is a tube made of polyoxymethylene (POM) material.

[0006] The intermediate sealing sleeve and elastic sleeve of this application are manufactured separately and set relatively independently. The sealing between the piston rod and the chamber, and the sealing between the annular gas chamber and the chamber are completed by two independent components, which greatly reduces the complexity of individual components and manufacturing costs; the reliability of each component is also greatly increased; and the sealing performance of the overall buffer structure is also increased.

[0007] Furthermore, it also includes a circular sleeve-shaped fixing support sleeve, which is disposed within the annular air chamber; The elastic sleeve has a U-shaped outward-flaring portion at its inner end near the piston; the outward-flaring portion includes an annular plate portion parallel to the inner wall of the cylinder. The head of the fixed support sleeve presses the annular plate against the inner wall of the cylinder, thereby achieving a seal between the elastic sleeve and the cylinder.

[0008] Furthermore, an annular sealing protrusion is provided on the outer side of the annular plate, and an annular sealing groove is provided on the inner wall of the cylinder; after assembly, the sealing protrusion is inserted into the sealing groove.

[0009] In this application, the sealing protrusion and the elastic sleeve are integrally formed, serving as a sealing ring that engages with the sealing groove on the inner wall of the cylinder. Therefore, the elastic sleeve of this application has a built-in oil seal structure, reducing costs, improving assembly efficiency, and enhancing overall sealing performance.

[0010] Furthermore, an annular groove is provided on the inner side of the annular plate portion, and an annular radial protrusion is provided on the outer circle of the head of the fixed support sleeve to engage with the annular groove.

[0011] The annular radial protrusion engages with the annular groove, pressing the annular plate against the inner wall of the cylinder body while also defining the axial position of the elastic sleeve on the cylinder body or piston rod; that is, while achieving a seal between the annular air chamber and the non-pressure chamber, it also achieves the function of limiting the elastic sleeve.

[0012] Furthermore, a countersunk hole is provided at the outer edge of the fixed support sleeve; and an inwardly recessed annular boss is provided at the bottom of the countersunk hole. The outer end of the elastic sleeve is provided with an L-shaped end, which includes an annular end plate portion and a side plate portion. The outer end of the intermediate sealing sleeve is provided with a radially protruding end cap. The end cap presses the side plate of the elastic sleeve and abuts against the side wall of the mounting countersunk hole of the fixed support sleeve, thereby achieving the sealing of the chamber at the outer end of the elastic sleeve.

[0013] Furthermore, an annular groove is provided on the side plate portion, and an annular protrusion adapted to the annular groove is provided on the outer circle of the end cap portion of the intermediate sealing sleeve. After the annular protrusion is inserted into the annular groove, it presses the side plate portion of the elastic sleeve tightly and abuts against the side wall of the mounting countersunk hole of the fixed support sleeve.

[0014] Furthermore, it also includes a pressure block, which is installed in the mounting countersunk hole of the fixed support sleeve to press the end cap of the intermediate sealing sleeve and the end plate of the elastic sleeve against the annular boss of the fixed support sleeve. This further improves the sealing of the cylinder chamber at the outer end of the elastic sleeve.

[0015] Furthermore, the pressure block is fixedly connected to the side wall of the countersunk hole in the fixed support sleeve by means of threaded connection or snap-fit.

[0016] Furthermore, the fixed support sleeve has a hollowed-out center to allow for gas circulation between the inner and outer sides.

[0017] Furthermore, multiple annular protrusions are spaced apart on the inner wall of the elongated hole to improve the sealing between the piston rod and the through hole. The number of annular protrusions can be set as needed, preferably 3-10.

[0018] Furthermore, the length of the intermediate sealing sleeve is 1 / 2 to 1 times the overall length of the elastic sleeve.

[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; The inner diameter of the sleeve cavity is larger than the inner diameter of the piston cavity; the sleeve cavity is provided with an annular recess at the bottom near the piston cavity; the inner end of the fixed support sleeve presses the bottom of the U-shaped outward turn of the elastic sleeve against the annular recess.

[0020] 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.

[0021] 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.

[0022] By adopting the above technical solution, this utility model has the following beneficial effects: The buffer provided by this utility model is made of a middle sealing sleeve and an elastic sleeve separately and independently. The sealing between the piston rod and the chamber and the sealing between the annular air chamber and the chamber are completed by two independent components, which greatly reduces the complexity and manufacturing cost of individual components; the reliability of each component is also greatly increased; and the elastic sleeve has its own oil seal structure, that is, the elastic sleeve and the oil seal are made as one piece, which also increases the sealing performance of the overall buffer structure. Attached Figure Description

[0023] 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.

[0024] Figure 1 A perspective view of the buffer provided for an embodiment of this utility model; Figure 2 for Figure 1 The main view of the buffer shown; Figure 3 for Figure 2 AA section view in the middle; Figure 4 for Figure 3 Enlarged view of section B in the middle; Figure 5 for Figure 1 An exploded view of the buffer shown; Figure 6 This is a perspective view of the intermediate sealing sleeve in the embodiment; Figure 7 This is a schematic diagram of the elastic sleeve in the embodiment; Figure 8 This is a perspective view of the fixed support sleeve in the embodiment; Figure 9 This is a perspective view of the elastic sleeve in the embodiment; Figure 10 This is a perspective view of the piston in the embodiment; Figure 11 This is a cross-sectional view of the cylinder block in the embodiment; Figure 12 This is a schematic diagram of a partial assembly structure of the elastic sleeve in the embodiment.

[0025] Figure label: 1-Valve ball; 2-Return spring; 10-Cylinder body; 11-Non-pressure chamber; 12-Pressure chamber; 13-Annular air chamber; 14-Piston chamber; 15-Sleeve cavity; 16-Sealing groove; 17-Annular countersunk platform; 0-Piston; 21-Piston rod; 30-Intermediate sealing sleeve; 31-Elongated hole; 32-End cap; 32a-Second annular protrusion; 40-Elastic sleeve; 41-Annular plate; 42-Sealing protrusion; 43-First annular groove; 44-End plate; 45-Side plate; 45a-Second annular groove; 50-Fixed support sleeve; 51-First annular radial protrusion; 52-Mounting countersunk hole; 52a-Annular boss; 60-Pressure block; 70-Sealing component. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] 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.

[0029] The present invention will be further explained below with reference to specific embodiments.

[0030] like Figure 1-12 As shown, the buffer provided in this embodiment includes: a cylinder 10, a piston 20, an intermediate sealing sleeve 30, and an elastic sleeve 40; The cylinder 10 is provided with a chamber for sealing in viscous liquid; The piston 20 is slidably disposed in the chamber; the piston 20 divides the chamber into a pressure chamber 12 on the side opposite to the piston rod 21 and a non-pressure chamber 11 on the side opposite to the piston rod 21; the elastic sleeve 40 and the intermediate sealing sleeve 30 are disposed in the non-pressure chamber 11.

[0031] The intermediate sealing sleeve 30 has an elongated hole 31 in the middle; the piston rod 21 extends out of the cylinder body 10 through the elongated hole 31; the piston rod 21 and the elongated hole 31 are sealed and can be slidably connected relative to each other; The elastic sleeve 40 is fitted outside the intermediate sealing sleeve 30, and together with the inner wall of the cylinder body 10, it forms an annular air chamber 13; the annular air chamber 13 is connected to the outside of the cylinder body 10 through an air passage.

[0032] The intermediate sealing sleeve 30 is made of non-metallic materials such as plastics and resins, such as polyoxymethylene (POM), or metallic materials such as stainless steel or copper alloys. Preferably, the intermediate sealing sleeve 30 is a tube made of polyoxymethylene (POM) material.

[0033] The intermediate sealing sleeve 30 and the elastic sleeve 40 of this application are made separately and set relatively independently. The sealing between the piston rod 21 and the chamber and the sealing between the annular air chamber 13 and the chamber are completed by two independent components, which greatly reduces the complexity of individual components and manufacturing costs; the reliability of each component is also greatly increased; and the sealing performance of the overall buffer structure is also increased.

[0034] More preferably, this embodiment also includes a circular sleeve-shaped fixing support sleeve 50, which is disposed in the annular air chamber 13; used to support and fix the elastic sleeve 40.

[0035] The elastic sleeve 40 has a U-shaped outward-turned portion at its inner end near the piston 20; the outward-turned portion includes an annular plate portion 41 parallel to the inner wall of the cylinder 10; the head of the fixed support sleeve 50 presses the annular plate portion 41 against the inner wall of the cylinder 10, thereby achieving a seal between the elastic sleeve 40 and the cylinder 10.

[0036] Preferably, see Figure 4 and Figure 7 As shown, an annular sealing protrusion 42 is provided on the outer side of the annular plate portion 41, and an annular sealing groove 16 is provided on the inner wall of the cylinder body 10; after assembly, the sealing protrusion 42 is engaged in the sealing groove 16. In this application, the sealing protrusion 42 is integrally formed with the elastic sleeve, and serves as a sealing ring to engage in the sealing groove 16 on the inner wall of the cylinder body. Thus, the elastic sleeve of this application has a built-in oil seal structure, which reduces costs, improves assembly efficiency, and enhances overall sealing performance.

[0037] More preferably, see Figure 4 and 12 As shown, a first annular groove 43 is provided on the inner side of the annular plate portion 41, and a first annular radial protrusion 51 is provided on the outer circle of the head of the fixed support sleeve 50 to engage with the first annular groove 43. The first annular radial protrusion 51 engages with the first annular groove 43, pressing the annular plate portion 41 against the inner wall of the cylinder body 10, while also further defining the position of the elastic sleeve 40 in the axial direction of the cylinder body 10 or piston rod 21; that is, while achieving a seal between the annular air chamber 13 and the non-pressure chamber 11, it also achieves the function of limiting the position of the elastic sleeve 40.

[0038] See Figure 12 As shown, a mounting countersunk hole 52 (or countersunk platform, countersunk groove structure) is provided at the outer edge of the fixed support sleeve 50; an inwardly recessed annular boss 52a is provided at the bottom of the mounting countersunk hole 52; an L-shaped end is provided at the outer end of the elastic sleeve 40, the L-shaped end including an annular end plate portion 44 and a side plate portion 45. The outer end of the intermediate sealing sleeve 30 is provided with a radially protruding end cap 32. The end cap 32 presses the side plate 45 of the elastic sleeve 40 against the side wall of the mounting countersunk hole 52 of the fixed support sleeve 50, thereby achieving the sealing of the chamber at the outer end of the elastic sleeve 40.

[0039] The side plate portion 45 of the elastic sleeve 40 is provided with a second annular groove 45a. The outer circle of the end cap portion 32 of the intermediate sealing sleeve 30 is provided with a second annular protrusion 32a that matches the second annular groove 45a. After the second annular protrusion 32a is inserted into the second annular groove 45a, it presses the side plate portion 45 of the elastic sleeve 40 and abuts against the side wall of the mounting countersunk hole 52 of the fixed support sleeve 50.

[0040] More preferably, see Figure 12 As shown, this embodiment may further include a pressure block 60, which is installed in the mounting countersunk hole 52 of the fixed support sleeve 50 to press the end cap 32 of the intermediate sealing sleeve 30 and the end plate 44 of the elastic sleeve 40 onto the annular boss 52a of the fixed support sleeve 50. This further improves the sealing of the cylinder 10 chamber at the outer end of the elastic sleeve 40. The pressure block 60 can be fixedly connected to the side wall of the mounting countersunk hole 52 of the fixed support sleeve 50 by means of threaded connection or snap-fit.

[0041] See Figure 8 As shown, the fixed support sleeve 50 has a hollowed-out center to allow for air circulation on both the inner and outer sides, and also to provide space for the deformation of the elastic sleeve 30.

[0042] The inner wall of the elongated hole 31 is preferably provided with a plurality of annular protrusions or fitted with a plurality of sealing rings (not shown) at intervals to improve the sealing between the piston rod 21 and the through hole. The number of annular protrusions or sealing rings can be set as needed, preferably 3-10. Furthermore, the length of the intermediate sealing sleeve 30 is 1 / 2 to 1 times the overall length of the elastic sleeve 40.

[0043] See Figure 11 As shown, a piston chamber 14 and a sleeve chamber 15 are sequentially arranged inside the cylinder body 10. The piston 20 is reciprocally slidably disposed in the piston chamber 14, and the elastic sleeve 40 is installed in the sleeve chamber 15. The inner diameter of the sleeve chamber 15 is larger than the inner diameter of the piston chamber 14. An annular recess 17 is provided at the bottom of the sleeve chamber 15 near the piston chamber 14. The inner end of the fixed support sleeve 50 presses the bottom of the U-shaped outward turn of the elastic sleeve 40 against the annular recess 17, further improving the sealing performance.

[0044] Furthermore, this embodiment also includes a sealing member 70 for sealing the cylinder opening of the cylinder body 10 at one end of the elastic sleeve 40; the sealing member 70 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 13 is provided inside the sealing member 70 or between the sealing member 70 and the cylinder body 10.

[0045] See Figure 12 As shown, this embodiment also includes a valve ball 1. The piston 20 has a passage connecting the pressure chamber 12 and the non-pressure chamber 11. A ball seat structure is provided on one side of the passage in the pressure chamber 12. The valve ball 1 is movably disposed within the pressure chamber 12 and is adapted to the ball seat structure to open and close the passage, or to adjust 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. The ball seat structure is a frustoconical chamber disposed on the piston 20 on one side of the pressure chamber 12. A limiting structure is provided on the outer side of the frustoconical chamber near the pressure chamber 12 to prevent the valve ball 1 from completely disengaging from the piston 20. The limiting structure can be a receiving cavity communicating with the frustoconical chamber or a cage-like body disposed on the outer side of the frustoconical chamber. This embodiment also includes a return spring 2, disposed within the pressure chamber 12. The two ends of the return spring 2 abut against the piston 20 and the cylinder 10 respectively, tending to force the piston 20 to move towards the non-pressure chamber 11 side.

[0046] The intermediate sealing sleeve 30 and the elastic sleeve 40 of this utility model are made separately and set relatively independently. The sealing between the piston rod 21 and the chamber and the sealing between the annular gas chamber 13 and the chamber are completed by two independent components, which greatly reduces the complexity of individual components and manufacturing costs; the reliability of each component is also greatly increased; and the elastic sleeve 40 has its own oil seal structure, that is, the elastic sleeve 40 and the oil seal are made as one piece, which also increases the sealing performance of the overall buffer structure.

[0047] 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, intermediate sealing sleeve, and elastic sleeve; The cylinder body is provided with a chamber for sealing in viscous liquid; The piston is slidably disposed in the chamber; the piston divides the chamber into a pressure chamber on the side opposite to the piston rod and a non-pressure chamber on the side opposite to the piston rod; the elastic sleeve and the intermediate sealing sleeve are disposed in the non-pressure chamber; The intermediate sealing sleeve has an elongated hole in the middle; the piston rod extends out of the cylinder body through the elongated hole; The piston rod is sealed to the elongated hole and can be slidably connected relative to it. The elastic sleeve is fitted outside the intermediate sealing sleeve, forming an annular air chamber between itself and the inner wall of the cylinder; the annular air chamber is connected to the outside of the cylinder through an air passage.

2. The buffer according to claim 1, characterized in that, The intermediate sealing sleeve is a tube made of polyoxymethylene material.

3. The buffer according to claim 1, characterized in that, It also includes a circular sleeve-shaped fixing support sleeve, which is disposed in the annular air chamber; The elastic sleeve has a U-shaped outward-flaring portion at its inner end near the piston; the outward-flaring portion includes an annular plate portion parallel to the inner wall of the cylinder. The head of the fixed support sleeve presses the annular plate against the inner wall of the cylinder, thereby achieving a seal between the elastic sleeve and the cylinder.

4. The buffer according to claim 3, characterized in that, An annular sealing protrusion is provided on the outer side of the annular plate, and an annular sealing groove is provided on the inner wall of the cylinder; after assembly, the sealing protrusion is inserted into the sealing groove.

5. The buffer according to claim 3, characterized in that, The inner side of the elastic sleeve annular plate is provided with an annular groove, and the outer circle of the head of the fixed support sleeve is provided with an annular radial protrusion that engages with the annular groove.

6. The buffer according to claim 3, characterized in that, The outer edge of the fixed support sleeve is provided with a countersunk hole; the bottom of the countersunk hole is provided with an inwardly recessed annular boss. The outer end of the elastic sleeve is provided with an L-shaped end, which includes an annular end plate portion and a side plate portion. The outer end of the intermediate sealing sleeve is provided with a radially protruding end cap. The end cap presses the side plate of the elastic sleeve and abuts against the side wall of the mounting countersunk hole of the fixed support sleeve, thereby achieving the sealing of the chamber at the outer end of the elastic sleeve.

7. The buffer according to claim 6, characterized in that, The side plate is provided with an annular groove, and the outer circle of the end cap of the intermediate sealing sleeve is provided with an annular protrusion that matches the annular groove. After the annular protrusion is inserted into the annular groove, it presses the side plate of the elastic sleeve tightly and abuts against the side wall of the mounting countersunk hole of the fixed support sleeve.

8. The buffer according to claim 6, characterized in that, It also includes a pressure block, which is filled into the mounting countersunk hole of the fixed support sleeve to press the end cap of the intermediate sealing sleeve and the end plate of the elastic sleeve against the annular boss of the fixed support sleeve.

9. The buffer according to claim 8, characterized in that, The pressure block is fixedly connected to the side wall of the countersunk hole in the fixed support sleeve by means of threaded connection or snap-fit.

10. The buffer according to claim 3, characterized in that, The fixed support sleeve has a hollowed-out center to allow for gas circulation between the inner and outer sides.

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

12. The buffer according to claim 1, characterized in that, The length of the intermediate sealing sleeve is 1 / 2 to 1 times the overall length of the elastic sleeve.

13. The buffer according to claim 3, 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 is provided with an annular recess at the bottom near the piston cavity; the inner end of the fixed support sleeve presses the bottom of the U-shaped outward turn of the elastic sleeve against the annular recess.

14. The buffer according to claim 1, 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.

Images