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CN-122014786-A - Shock absorber

CN122014786ACN 122014786 ACN122014786 ACN 122014786ACN-122014786-A

Abstract

The invention belongs to the technical field of vehicle accessories, and relates to a shock absorber, which comprises a bottom valve assembly, a working cylinder assembly and an external nitrogen gas storage bottle, wherein a damping cavity for oil supply liquid to flow back and forth is arranged in the bottom valve assembly, the external nitrogen gas storage bottle comprises an outer bottle body and an inner bottle body which are arranged at intervals, the inner bottle body is slidably provided with a floating piston, the cavity of the inner bottle body is divided into a gas bottle oil cavity and a gas cavity by the floating piston, an oil overflow cavity is formed between the outer bottle body and the inner bottle body, the gas bottle oil cavity is communicated with the oil overflow cavity through an oil overflow hole, the oil overflow cavity is communicated with the working cylinder assembly through a backflow channel, and the oil overflow hole is arranged at the top of the gas bottle oil cavity. The shock absorber provided by the invention can solve the technical problem of oil-liquid series flow of the existing nitrogen shock absorber.

Inventors

  • CHEN JINMING
  • LIU YONG

Assignees

  • 台州市诺高科技有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (10)

  1. 1. The utility model provides a bumper shock absorber, includes bottom valve assembly (1), working cylinder assembly (2) and external nitrogen gas bomb (3), its characterized in that, external nitrogen gas bomb (3) are including outer bottle (31) and interior bottle (32) that the interval set up, interior bottle (32) slide and are provided with floating piston (33), the cavity of floating piston (33) with interior bottle (32) is separated into gas cylinder oil pocket (34) and air cavity (35), form between outer bottle (31) and interior bottle (32) and spill oil pocket (36), gas cylinder oil pocket (34) are through spill oil hole (37) intercommunication with spill oil pocket (36), spill oil pocket (36) are through backflow channel (11) intercommunication with working cylinder assembly (2), spill oil hole (37) set up in the top of gas cylinder oil pocket (34).
  2. 2. The shock absorber according to claim 1, wherein an oil cavity sealing ring (331) is arranged at the bottom of the floating piston (33), an air cavity sealing ring (332) is arranged at the top of the floating piston, an annular oil overflow groove (38) is formed in the middle of the inner wall of the inner bottle body (32), the oil overflow hole (37) is formed in the annular oil overflow groove (38) and penetrates through the inner bottle body (32), and a conduction gap is formed between the oil cavity sealing ring (331) and the annular oil overflow groove (38) when the floating piston (33) moves to the annular oil overflow groove (38).
  3. 3. A shock absorber according to claim 2, wherein the annular oil spill groove (38) comprises an upper conical groove (381), a cylindrical groove (382) and a lower conical groove (383) which are sequentially arranged from top to bottom, and the oil spill hole (37) is formed in the cylindrical groove (382) or in both the cylindrical groove (382) and the upper conical groove (381).
  4. 4. A shock absorber according to claim 2, wherein the oil spill hole (37) is provided with two or more oil spill holes which are located at the same axial position of the annular oil spill groove (38) and are evenly distributed in the circumferential direction.
  5. 5. A shock absorber according to claim 1, wherein the bottom valve assembly (1) is provided with a stepped gas cylinder mounting seat (16), the outer cylinder (31) and the inner cylinder (32) are respectively adapted to respective corresponding stepped mounting structures, and the outer cylinder (31) and the inner cylinder (32) are coaxially arranged.
  6. 6. The shock absorber according to claim 5, wherein a first convex ring (311) extending inwards is arranged at the top of the inner wall of the outer bottle body (31), a second convex ring (321) extending outwards is arranged at the top of the inner bottle body (32), the second convex ring (321) is in sealing connection with the inner wall of the outer bottle body (31) and is abutted against the bottom of the first convex ring (311), a third convex ring (322) extending outwards is arranged in the middle of the inner bottle body (32), an oil spilling sealing ring (323) in sealing connection with the inner wall of the outer bottle body (31) is sleeved on the third convex ring (322), and an oil spilling cavity (36) is formed by the third convex ring (322), the outer bottle body (31) and the inner bottle body (32) in a surrounding mode.
  7. 7. The shock absorber according to claim 1, wherein a shock absorption upper cavity (20) and a damping lower cavity are arranged in the working cylinder assembly (2), the damping lower cavity is surrounded by a first cylinder body (21), a second cylinder body (22) and a third cylinder body (23) which are coaxially arranged, the shock absorber comprises a working cavity (24) in the third cylinder body (23), an oil storage cavity (25) between the third cylinder body (23) and the second cylinder body (22), an oil return cavity (26) between the second cylinder body (22) and the first cylinder body (21), a piston assembly (27) is slidably arranged in the working cylinder assembly (2), the shock absorption upper cavity (20) is communicated with the working cavity (24) through a one-way oil seal (28), the oil storage cavity (25) is communicated with the top of the working cavity (24), the oil return cavity (26) is communicated with the shock absorption upper cavity (20), and the oil return channel (11) is communicated with the oil return cavity (26).
  8. 8. A shock absorber according to claim 7, wherein a guide sleeve (29) is fixed to the top of the second cylinder (22), the piston assembly (27) is slidably arranged in the guide sleeve (29), the unidirectional oil seal (28) is arranged between the guide sleeve (29) and the piston assembly (27), and the guide sleeve (29) is in clearance fit with the first cylinder (21).
  9. 9. A shock absorber according to claim 7, wherein the return channel (11) is provided in the base valve assembly (1) and has one end communicating with the bottom of the oil spill cavity (36) and the other end communicating with the bottom of the oil return cavity (26).
  10. 10. A shock absorber according to claim 7, wherein a compression damping chamber (12) and a rebound damping chamber (13) are provided in the base valve assembly (1), a compression damping valve (14) is provided in the compression damping chamber (12), a rebound damping valve (15) is provided in the rebound damping chamber (13), an inlet end of the compression damping valve (14) is communicated with the working chamber (24), an outlet end is communicated with an outlet end of the rebound damping valve (15), an inlet end of the rebound damping valve (15) is communicated with the oil storage chamber (25), and an outlet end is communicated with the oil chamber (34) of the gas cylinder.

Description

Shock absorber Technical Field The invention belongs to the technical field of vehicle accessories, and relates to a shock absorber. Background The nitrogen damper is widely applied to the fields of off-road vehicles, high-performance passenger vehicles and industrial equipment. The existing nitrogen shock absorber generally comprises a working cylinder assembly, an external nitrogen gas storage bottle and a damping valve system, wherein a piston assembly, a shock absorption upper cavity and a damping lower cavity are arranged in the working cylinder assembly. A floating piston is arranged in the external nitrogen gas storage bottle, the floating piston divides the interior of the gas storage bottle into an oil cavity and an air cavity, and high-pressure nitrogen is filled in the air cavity. When the shock absorber works, oil flows back and forth among the damping lower cavity, the external nitrogen gas storage bottle and the damping valve system, damping force is generated through the damping valve system, and meanwhile, the gas spring effect is achieved through the compressibility of nitrogen. The oil cavity of the external nitrogen gas storage bottle is directly communicated with the damping lower cavity, the oil enters the oil cavity to push the floating piston to compress the air cavity, and the floating piston resets under the action of the air cavity pressure during rebound to push the oil back to the damping lower cavity. The damping upper cavity and the damping lower cavity of the shock absorber are both closed cavities, but under the influence of high pressure, oil in the damping upper cavity possibly enters the damping lower cavity, oil in the damping lower cavity possibly also enters the damping upper cavity, the phenomenon is called oil-mixing, and the oil-mixing phenomenon can seriously affect the performance of the shock absorber. When the oil in the damping lower cavity is in series, the air cylinder floats to the bottom, air bubbles can be generated in the damping lower cavity, and the riding damping change is larger. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a shock absorber to solve the technical problem of the existing nitrogen shock absorber oil-liquid series flow. In order to solve the technical problems, the aim of the invention is realized by the following technical scheme: The utility model provides a bumper shock absorber, includes bottom valve assembly, working cylinder assembly and external nitrogen gas bomb, external nitrogen gas bomb is including outer bottle and the interior bottle that the interval set up, interior bottle slides and is provided with floating piston, floating piston separates into gas cylinder oil pocket and air cavity with the cavity of interior bottle, form the oil spilling chamber between outer bottle and the interior bottle, gas cylinder oil pocket and oil spilling chamber pass through the oil spilling hole intercommunication, oil spilling chamber and working cylinder assembly pass through the return passage intercommunication, the oil spilling hole sets up in the top of gas cylinder oil pocket. As a further improvement of the invention, the bottom of the floating piston is provided with an oil cavity sealing ring, the top of the floating piston is provided with an air cavity sealing ring, the middle part of the inner wall of the inner bottle body is provided with an annular oil overflow groove, the oil overflow hole is arranged on the annular oil overflow groove and penetrates through the inner bottle body, and when the floating piston moves to the annular oil overflow groove, a conduction gap is formed between the oil cavity sealing ring and the annular oil overflow groove. As a further improvement of the invention, the annular oil overflow groove comprises an upper conical groove, a cylindrical groove and a lower conical groove which are sequentially arranged from top to bottom, wherein the oil overflow Kong Kaishe is arranged on the cylindrical groove or is simultaneously arranged on the cylindrical groove and the upper conical groove, specifically, the radial dimension of the upper conical groove is gradually enlarged from top to bottom, the radial dimension of the lower conical groove is gradually enlarged from bottom to top, and the upper conical groove and the lower conical groove are respectively in smooth transition with the inner wall of the inner bottle body and the cylindrical groove. As a further improvement of the invention, the oil spill holes are provided with more than two oil spill holes which are positioned at the same axial position of the annular oil spill groove and are uniformly distributed along the circumferential direction. As a further improvement of the invention, the bottom valve assembly is provided with a stepped gas cylinder mounting seat, the outer bottle body and the inner bottle body are respectively matched with the corresponding stepped mounting structures, the outer bottle