A booster gas spring with noise reduction function

Abstract

This invention discloses a power-assisted gas spring with noise reduction function, comprising a cylinder and a piston rod assembly. The piston rod assembly divides the inner cavity of the cylinder into a rod chamber and a rodless chamber. A spring is disposed in the rodless chamber, and the spring and the cylinder are in clearance fit. A front spacer assembly and a rear spacer assembly are disposed in the rodless chamber. The front spacer assembly is movably disposed in the rodless chamber and is in clearance fit with the cylinder. The rear spacer assembly is fixedly disposed at the rear end of the cylinder. The spring abuts against the front spacer assembly and the rear spacer assembly. The front spacer assembly includes a front spacer body and a sealing ring. The sealing ring is sleeved on the front spacer body and has several first protrusions. Several second protrusions are disposed on the outer side wall of the sealing ring. Several third protrusions are disposed on the upper end surface of the front spacer body along the circumferential direction. The first protrusions protrude beyond the third protrusions. The hardness of the first protrusions is less than that of the third protrusions. The front spacer assembly generates less noise upon impact.

Description

Technical Field

[0001] The invention relates to the technical field of dampers, and in particular to a booster gas spring with a noise reduction function. Background Art

[0002] The main function of the balance bar for the tailgate of an automobile is to help the driver to open and close the tailgate more easily and conveniently. Specifically, the balance bar can provide a reverse force through the spring or air pressure device inside it to offset the weight of the tailgate itself. In this way, when the driver opens or closes the tailgate, he does not need to spend too much effort. He only needs to push or pull it gently, and the tailgate can be opened or closed smoothly. For example, a Chinese patent application (publication number: CN220889876U) discloses a balance bar for an automobile, which includes a cylinder, a piston assembly, a piston rod and a spring. One end of the piston rod is fixedly connected to the piston assembly, and the other end of the piston rod extends out of the front end of the cylinder. The spring and the inner wall of the cylinder are in a clearance fit. The cylinder is also provided with a front spacer and a rear spacer, respectively. The front spacer is movably arranged in the cylinder, and the front spacer is provided with a guide ring that slides with the inner wall of the cylinder. The rear spacer is fixedly arranged at the rear end of the cylinder, and the spring is arranged between the front spacer and the rear spacer. By optimizing and improving the installation structure of the spring, it is effectively ensured that the spring is not prone to movement in the cylinder, and that the spring will not have unexpected radial displacement deformation when compressed, thereby ensuring the stability of the spring force value and avoiding the occurrence of abnormal noise.

[0003] However, in the above-mentioned automobile balance bar, when the piston assembly contacts the front sleeve, the contact area between the two is large, which will produce a more obvious impact sound. When the spring is compressed and bent, the front sleeve is likely to collide with the inner wall of the cylinder, which will also produce an impact sound, forming a relatively large noise. This collision may also affect the service life of the automobile balance bar, so it is necessary to improve it. Summary of the invention

[0004] The purpose of the present invention is to provide a booster gas spring with noise reduction function in view of the defects and shortcomings of the prior art, which has a simple and reasonable structure, is easy to operate, and has low noise generated by the impact of the front spacer assembly.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The power-assisting gas spring with noise reduction function described in the present invention comprises a cylinder, a piston rod assembly is movably arranged in the cylinder, the piston rod assembly divides the inner cavity of the cylinder into a rod cavity and a rodless cavity, a spring is arranged in the rodless cavity, the spring and the cylinder are in a clearance fit, a front spacer assembly and a rear spacer assembly are arranged in the rodless cavity, the front spacer assembly is movably arranged in the rodless cavity, the front spacer assembly and the cylinder are in a clearance fit, the rear spacer assembly is fixedly arranged at the rear end of the cylinder, and the spring is arranged between the front spacer assembly and the rear spacer assembly The front sleeve assembly includes a front sleeve body and a sealing ring, the sealing ring is sleeved on the front sleeve body, a through hole is axially provided at the center of the front sleeve body, a plurality of first protrusions are circumferentially provided on the upper end surface of the sealing ring, a plurality of second protrusions are circumferentially provided on the outer wall of the sealing ring, the second protrusions protrude from the outer wall of the front sleeve body, a plurality of third protrusions are circumferentially provided on the upper end surface of the front sleeve body, the first protrusions protrude from the third protrusions, and the hardness of the first protrusions is less than that of the third protrusions.

[0007] Furthermore, the piston rod assembly includes a piston, a piston rod and a gasket, the piston is fixedly connected to the piston rod, the gasket is fixedly connected to the lower end of the piston, and the piston is provided with a damping channel connecting the rod cavity and the rodless cavity.

[0008] Furthermore, the outer diameter of the gasket is smaller than the outer diameter of the piston.

[0009] Further, the sealing ring includes an outer annular portion and an inner annular portion, the outer annular portion is sleeved on the outer side wall of the front sleeve body, the inner annular portion is located at the upper end of the through hole, the outer annular portion and the inner annular portion are connected via a plurality of connecting portions, the upper end surface of the front sleeve body is provided with a plurality of limiting grooves which cooperate with the connecting portions, the upper end surface of the connecting portion is provided with the first protrusion, and the outer side wall of the outer annular portion is provided with the second protrusion.

[0010] Furthermore, an annular groove is provided on the outer side wall of the front spacer body, the outer annular portion is arranged in the annular groove, a plurality of first recessed portions are provided on the outer side wall of the front spacer body, the first recessed portions are recessed toward the center of the front spacer body, a plurality of second recessed portions corresponding to the first recessed portions are provided on the outer side wall of the outer annular portion, and the second recessed portions are recessed toward the center of the outer annular portion.

[0011] Furthermore, the sealing ring is made of hydrogenated nitrile rubber material, and the front spacer body is made of plastic material.

[0012] Furthermore, the upper end surface of the front spacer body is provided with a plurality of grooves connected with the through holes along the circumferential direction.

[0013] Furthermore, the rear spacer assembly includes a rear spacer body and an O-ring, wherein the O-ring is sleeved on the outside of the rear spacer body, and the O-ring is interference fit with the inner wall of the cylinder.

[0014] Furthermore, a short guide column is axially protruded from the center of the rear spacer body.

[0015] Furthermore, a long guide column is axially protruded from the center of the rear spacer body.

[0016] The beneficial effects of the present invention are as follows: when the piston rod assembly is pressed down and contacts the front sleeve assembly, since the first protrusion protrudes from the third protrusion, the piston rod assembly first contacts the first protrusion and then contacts the third protrusion, which can effectively reduce the contact area between the piston rod assembly and the front sleeve assembly, reduce the impact sound, and reduce noise. The first protrusion is made of rubber material, which is relatively soft and can play a role in buffering and shock absorption, further reducing the sound caused by the impact. When the piston rod assembly presses down the front sleeve assembly and then compresses the spring, the spring is easily subjected to radial deformation by force. The outer side wall of the front sleeve body is provided with a second protrusion, which can provide buffering when the spring is compressed and bent. The second protrusion contacts the inner wall of the cylinder, which can effectively reduce the contact area between the front sleeve assembly and the inner wall of the cylinder, reduce the impact sound, and reduce noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the cross-sectional structure of the present invention at a first viewing angle;

[0018] Figure 2 is a schematic diagram of the cross-sectional structure of the present invention at a second viewing angle;

[0019] Figure 3 It is a schematic diagram of the exploded structure of the piston rod assembly;

[0020] Figure 4 It is a structural schematic diagram of a rear spacer body provided with a short guide post;

[0021] Figure 5 It is a structural schematic diagram of a rear spacer body provided with a long guide post;

[0022] Figure 6 is a schematic diagram of the structure of the front spacer assembly;

[0023] Figure 7 is a schematic diagram of the exploded structure of the front spacer assembly;

[0024] Figure 8 It is a schematic diagram of the cross-sectional structure of the front spacer assembly.

[0025] Figure 1-Figure 8In: 1. Cylinder barrel; 11. Rod chamber; 12. Rodless chamber; 2. Piston rod assembly; 21. Piston; 211. Damping channel; 22. Piston rod; 23. Gasket; 24. Open gasket; 241. Open groove; 25. Piston ring; 3. Spring; 4. Front sleeve assembly; 41. Front sleeve body; 411. Through hole; 412. Third protrusion; 413. Ring groove; 414. First recessed portion; 415. Groove; 416. Limiting groove; 42. Sealing ring; 421. Outer annular portion; 4211. Second protrusion; 4212. Second recessed portion; 422. Inner annular portion; 423. Connecting portion; 4231. First protrusion; 5. Rear sleeve assembly; 51. Rear sleeve body; 52. "O" ring; 511. Long guide post; 512. Short guide post. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] like Figure 1-Figure 8 A power-assisting gas spring with noise reduction function shown in the figure comprises a cylinder 1, a piston rod assembly 2 is movably arranged in the cylinder 1, the inner cavity of the cylinder 1 is filled with a damping medium, the piston rod assembly 2 divides the inner cavity of the cylinder 1 into a rod cavity 11 and a rodless cavity 12, a spring 3 is arranged in the rodless cavity 12, the spring 3 and the cylinder 1 are in a clearance fit, a front spacer assembly 4 and a rear spacer assembly 5 are arranged in the rodless cavity 12, the front spacer assembly 4 is movably arranged in the rodless cavity 12, the front spacer assembly 4 and the cylinder 1 are in a clearance fit, the rear spacer assembly 5 is fixedly arranged at the rear end of the cylinder 1, the spring 3 is arranged between the front spacer assembly 4 and the rear spacer assembly 5, plays a supporting and guiding role, reduces the radial deformation of the spring 3, and thereby reduces the collision between the spring 3 and the cylinder 1, and reduces abnormal noise, refer to Figure 6-8The front sleeve assembly 4 includes a front sleeve body 41 and a sealing ring 42. The sealing ring 42 is sleeved on the front sleeve body 41 and fits tightly with the front sleeve body 41. The center of the front sleeve body 41 is provided with a through hole 411 along the axial direction to allow the damping medium to pass through. The upper end surface of the sealing ring 42 is provided with a plurality of first protrusions 4231 along the circumferential direction. Specifically, there are 4 first protrusions 4231, and the first protrusions 4231 protrude upward along the axial direction of the sealing ring 42. Of course, in other embodiments, there may also be other numbers of first protrusions 4231. The outer wall of the sealing ring 42 is provided with a plurality of second protrusions 4231 along the circumferential direction. Bump 4211, the second bump 4211 protrudes outward along the radial direction of the sealing ring 42, the second bump 4211 protrudes from the outer side wall of the front sleeve body 41, and the upper end surface of the front sleeve body 41 is provided with a plurality of third bumps 412 along the circumferential direction. Specifically, there are 8 third bumps 412. Of course, in other embodiments, there may be other numbers of third bumps 412. The third bump 412 protrudes upward along the axial direction of the front sleeve body 41, and the first bump 4231 protrudes from the third bump 412. The hardness of the first bump 4231 is less than the hardness of the third bump 412.

[0028] Preferably, in this embodiment, the sealing ring 42 is made of hydrogenated nitrile rubber material, and the first protrusion 4231 and the second protrusion 4211 are integrally formed with the sealing ring 42. The hydrogenated nitrile rubber is obtained by hydrogenating nitrile rubber. The hydrogenation process saturates the unsaturated bonds in the nitrile rubber with hydrogen atoms, thereby forming a highly saturated special elastomer. The hydrogenated nitrile rubber has excellent heat resistance, oil resistance and aging resistance, and can effectively improve the service life of the sealing ring 42. Preferably, the front sleeve body 41 is made of plastic material, and the third protrusion 412 is integrally formed with the front sleeve body 41. The plastic is easy to process, low in cost, and has good corrosion resistance, which is beneficial to extending the service life of the front sleeve body 41.

[0029] When the piston rod assembly 2 is pressed down and contacts the front sleeve assembly 4, since the first protrusion 4231 protrudes from the third protrusion 412, the piston rod assembly 2 first contacts the first protrusion 4231 and then contacts the third protrusion 412, which can effectively reduce the contact area between the piston rod assembly 2 and the front sleeve assembly 4, reduce the impact sound, and reduce noise. The first protrusion 4231 is made of rubber material, which is relatively soft and can play a role in buffering and shock absorption, further reducing the sound caused by the impact. When the piston rod assembly 2 presses down the front sleeve assembly 4 and then compresses the spring 3, the spring 3 is easily subjected to radial deformation by the force. The outer wall of the front sleeve body 41 is provided with a second protrusion 4211, which can provide buffering when the spring 3 is compressed and bent. The second protrusion 4211 contacts the inner wall of the cylinder 1, which can effectively reduce the contact area between the front sleeve assembly 4 and the inner wall of the cylinder 1, reduce the impact sound, and reduce noise.

[0030] Preferably, in this embodiment, refer to Figure 3 The piston rod assembly 2 includes a piston 21, a piston rod 22, an open gasket 24, a piston ring 25 and a gasket 23. The piston ring 25 is sleeved on the piston 21. The piston 21 is fixedly connected to the lower end of the piston rod 22, and the connection relationship is firm. The upper end of the piston rod 22 extends out of the cylinder 1. The open gasket 24 is fixedly connected to the upper end of the piston 21. Preferably, the outer periphery of the open gasket 24 is provided with a plurality of open grooves 241, so that the damping medium can pass more smoothly. The gasket 23 is fixedly connected to the lower end of the piston 21. Preferably, in this embodiment, the outer diameter of the gasket 23 is smaller than the outer diameter of the piston 21, so as to facilitate the passage of the damping medium. The piston 21 is provided with a damping channel 211 connecting the rod chamber 11 and the rodless chamber 12. The damping medium flows between the rod chamber 11 and the rodless chamber 12 through the damping channel 211, thereby achieving a damping effect.

[0031] Preferably, in this embodiment, the sealing ring 42 includes an outer annular portion 421 and an inner annular portion 422, the outer annular portion 421 is sleeved on the outer side wall of the front spacer body 41, the inner annular portion 422 is located at the upper end of the through hole 411, the outer annular portion 421 and the inner annular portion 422 are connected by a plurality of connecting portions 423, specifically, the connecting portion 423 extends along the radial direction of the inner annular portion 422, so that the connecting portion 423 can more stably connect the inner annular portion 422 and the outer annular portion 421, the upper end surface of the front spacer body 41 is provided with a plurality of limiting grooves 416 which cooperate with the connecting portion 423 to limit the position, play a limiting role, and avoid the sealing ring 42 from being unexpectedly displaced, the upper end surface of the connecting portion 423 is provided with the first protrusion 4231, and the outer side wall of the outer annular portion 421 is provided with the second protrusion 4211.

[0032] Preferably, in this embodiment, the outer side wall of the front spacer body 41 is provided with an annular groove 413, and the outer circular ring portion 421 is arranged in the annular groove 413, which can effectively prevent the outer circular ring portion 421 from being unnecessary displaced or falling off during use, thereby affecting use. A plurality of first recessed portions 414 are provided on the outer side wall of the front spacer body 41, and the first recessed portions 414 are recessed toward the center of the front spacer body 41. A plurality of second recessed portions 4212 corresponding to the first recessed portions 414 are provided on the outer side wall of the outer circular ring portion 421, and the second recessed portions 4212 are recessed toward the center of the outer circular ring portion 421. By arranging the first recessed portions 414 and the second recessed portions 4212, the damping medium can pass through the front spacer assembly 4 more smoothly, thereby effectively reducing the noise and vibration generated by the fluid or other media when passing through.

[0033] Preferably, in this embodiment, the upper end surface of the front spacer body 41 is provided with a plurality of grooves 415 connected with the through holes 411 along the circumferential direction to increase the flow rate so that the damping medium can pass through the front spacer body 41 more smoothly.

[0034] Preferably, in this embodiment, an avoidance slope is provided at the upper end of the through hole 411 of the front sleeve body 41, and the avoidance slope is inclined toward the inner side of the front sleeve body 41, which can reduce the use of materials and reduce weight. A rivet head is provided at the lower end of the piston rod 22, and the rivet head will drill into the front sleeve body 41 when the piston rod 22 moves downward, and the avoidance slope plays a role of avoidance.

[0035] Preferably, in this embodiment, the rear spacer assembly 5 includes a rear spacer body 51 and an "O" ring 52, and the "O" ring 52 is sleeved on the outside of the rear spacer body 51. The "O" ring 52 is interference fit with the inner wall of the cylinder 1 to play a sealing role. The "O" ring 52 presses the rear spacer body 51 into the cylinder 1, so that the rear spacer body 51 is not easily displaced, thereby preventing the spring 3 from moving. Preferably, the number of "O" rings 52 is one, and of course it can also be two or more.

[0036] Preferably, in this embodiment, refer to Figure 4 The center of the rear spacer body 51 is provided with a short guide post 512 along the axial direction. The short guide post 512 can provide support, reduce the deformation degree of the spring 3 after compression, and further suppress noise. The short guide post 512 can also be replaced by a long guide post 511, see Figure 5 A long guide column 511 is axially protruded from the center of the rear spacer body 51. It should be noted that the long guide column 511 and the short guide column 512 refer to that the axial length of the long guide column 511 is greater than the axial length of the short guide column 512, and the long guide column 511 can provide better support than the short guide column 512.

[0037] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A booster gas spring with a noise reduction function, comprising a cylinder (1), a piston rod assembly (2) movably arranged in the cylinder (1), the piston rod assembly (2) dividing the inner cavity of the cylinder (1) into a rod cavity (11) and a rodless cavity (12), a spring (3) being arranged in the rodless cavity (12), the spring (3) and the cylinder (1) being in a clearance fit, characterized in that: The rodless cavity (12) is provided with a front spacer assembly (4) and a rear spacer assembly (5). The front spacer assembly (4) is movably arranged in the rodless cavity (12). The front spacer assembly (4) and the cylinder barrel (1) are clearance-matched. The rear spacer assembly (5) is fixedly arranged at the rear end of the cylinder barrel (1). The spring (3) is arranged between the front spacer assembly (4) and the rear spacer assembly (5). The front spacer assembly (4) includes a front spacer body (41) and a sealing ring (42). The sealing ring (42) is sleeved on the front spacer body (41). The center of the front spacer body (41) is along the axis. A through hole (411) is provided in the upper end surface of the sealing ring (42) along the circumferential direction, a plurality of first protrusions (4231) are provided in the circumferential direction, a plurality of second protrusions (4211) are provided in the circumferential direction on the outer side wall of the sealing ring (42), the second protrusions (4211) protrude from the outer side wall of the front spacer body (41), a plurality of third protrusions (412) are provided in the upper end surface of the front spacer body (41) along the circumferential direction, the first protrusions (4231) protrude from the third protrusions (412), and the hardness of the first protrusions (4231) is less than the hardness of the third protrusions (412); The sealing ring (42) comprises an outer annular portion (421) and an inner annular portion (422); the outer annular portion (421) and the inner annular portion (422) are connected via a plurality of connecting portions (423); the upper end surface of the connecting portion (423) is provided with the first protrusion (4231); the outer side wall of the front spacer body (41) is provided with an annular groove (413), and the outer annular portion (421) is arranged in the annular groove (413).

2. The booster gas spring with noise reduction function according to claim 1, characterized in that: The piston rod assembly (2) comprises a piston (21), a piston rod (22) and a gasket (23); the piston (21) is fixedly connected to the piston rod (22); the gasket (23) is fixedly connected to the lower end of the piston (21); and the piston (21) is provided with a damping channel (211) communicating with the rod chamber (11) and the rodless chamber (12).

3. The booster gas spring with noise reduction function according to claim 2, characterized in that: The outer diameter of the gasket (23) is smaller than the outer diameter of the piston (21).

4. The booster gas spring with noise reduction function according to claim 1, characterized in that: The inner annular portion (422) is located at the upper end of the through hole (411), the upper end surface of the front spacer body (41) is provided with a plurality of limiting grooves (416) that cooperate with the connecting portion (423) to limit the position, and the outer side wall of the outer annular portion (421) is provided with the second protrusion (4211).

5. The booster gas spring with noise reduction function according to claim 4, characterized in that: A plurality of first recessed portions (414) are provided on the outer wall of the front spacer body (41), and the first recessed portions (414) are recessed toward the center of the front spacer body (41). A plurality of second recessed portions (4212) corresponding to the first recessed portions (414) are provided on the outer wall of the outer annular portion (421), and the second recessed portions (4212) are recessed toward the center of the outer annular portion (421).

6. The booster gas spring with noise reduction function according to claim 1, characterized in that: The sealing ring (42) is made of hydrogenated nitrile rubber material, and the front spacer body (41) is made of plastic material.

7. The booster gas spring with noise reduction function according to claim 1, characterized in that: The upper end surface of the front spacer body (41) is provided with a plurality of grooves (415) in a circumferential direction and connected to the through holes (411).

8. The booster gas spring with noise reduction function according to claim 1, characterized in that: The rear spacer assembly (5) comprises a rear spacer body (51) and an O-ring (52), wherein the O-ring (52) is sleeved on the outside of the rear spacer body (51), and the O-ring (52) is interference fit with the inner wall of the cylinder barrel (1).

9. The booster gas spring with noise reduction function according to claim 8, characterized in that: A short guide column (512) is protruded axially from the center of the rear spacer body (51).

10. The booster gas spring with noise reduction function according to claim 8, characterized in that: A long guide column (511) is protruded axially from the center of the rear spacer body (51).

Images