CN-122014789-A - Automobile shock absorber ware piston rod of integrated self-lubricating noise cancelling structure

CN122014789ACN 122014789 ACN122014789 ACN 122014789ACN-122014789-A

Abstract

The invention discloses an automobile shock absorber piston rod integrated with a self-lubricating noise-eliminating structure, wherein spiral micro grooves are formed in the outer circumferential surface of the piston rod, a pumping angle is formed between the spiral direction of the spiral micro grooves and the descending direction of the piston rod, the groove depth gradually becomes shallow from the axial middle part to the two ends, a porous bronze sintered layer is covered on the outer surface of the piston rod, the thickness of the porous bronze sintered layer is smaller than the groove depth of the spiral micro grooves, and an annular oil collecting groove is formed in the inner hole wall surface of a guide sleeve and periodically communicated with the spiral micro grooves in movement. The spiral micro-groove pumps the oil to the matching area of the guide sleeve when the piston rod descends, the annular oil collecting groove collects temporary oil, the porous bronze sintering layer adsorbs and stores the oil, and the spiral micro-groove and the porous bronze sintering layer release the oil to the matching surface cooperatively when the piston rod ascends, so that a full-stroke lubricating oil film is maintained.

Inventors

CHEN FENG
Shi Beier
YANG GUANGTONG
ZHANG ZHAOHAI

Assignees

宁波市奉化拓翔机械有限公司

Dates

Publication Date: 20260512
Application Date: 20260323

Claims (10)

1. A spiral micro-groove oil storage self-circulation piston rod for an automobile shock absorber is characterized by comprising a piston rod (2), a guide sleeve (3), an oil seal (4), a spiral micro-groove (6) and an annular oil collecting groove (5), wherein the piston rod (2) penetrates through a cylinder barrel (1) and moves linearly in a reciprocating mode along the axial direction of the cylinder barrel, the guide sleeve is fixedly connected to an inner hole of the opening end of the cylinder barrel, the oil seal (4) is fixedly connected to the opening end of the cylinder barrel and is located on the outer side of the guide sleeve along the extending direction of the piston rod, the spiral micro-groove extends along a spiral line on the outer circumferential surface of the piston rod, the spiral direction of the spiral micro-groove is set to generate pumping driving force for oil in the groove towards the guide sleeve direction when the piston rod descends, the groove depth of the spiral micro-groove gradually becomes shallow from the axial middle of the piston rod to the two ends, the groove width is kept constant along the spiral stroke, a porous bronze sintered layer (7) is coated on the outer surface of the piston rod, the porous bronze sintered layer is fixedly sintered on the outer surface of a base metal of the piston rod and covers between the adjacent spiral micro-groove, the porous bronze sintered layer is smaller than the groove depth of the spiral micro-groove, the groove extends circumferentially, and the annular oil collecting groove is formed on the inner hole wall of the guide sleeve, and the spiral micro groove is formed when the piston rod reciprocates.
2. The spiral micro-groove oil storage self-circulation piston rod according to claim 1, wherein one end of the piston rod, which is far away from the extending end, is fixedly connected with a piston (8), the outer peripheral surface of the piston is in sealing sliding fit with the inner wall of the cylinder barrel, the inner cavity of the cylinder barrel is divided into two oil cavities, and the damping oil liquid fills the inner cavity of the cylinder barrel and the fit gap between the piston rod and the guide sleeve.
3. The spiral micro-groove oil storage self-circulation piston rod according to claim 1, wherein the spiral micro-groove is a single-head spiral groove and continuously extends along the outer circumferential surface of the piston rod at a constant helix angle to form a single uninterrupted spiral channel.
4. The spiral micro-groove oil storage self-circulation piston rod according to claim 1, wherein the spiral micro-groove is a multi-head spiral groove, the plurality of spiral micro-grooves are uniformly distributed along the circumferential direction of the outer circumferential surface of the piston rod, and the spiral direction and the spiral lift angle of each spiral micro-groove are the same.
5. The spiral micro-groove oil storage self-circulation piston rod according to claim 1, wherein the groove depth of the spiral micro-groove is linearly gradually changed along the axial direction, and the groove depth is gradually decreased from the axial middle part of the piston rod to the two ends at equal slopes.
6. The spiral micro-groove oil storage self-circulation piston rod according to claim 1, wherein the groove depth of the spiral micro-groove is in nonlinear gradual change along the axial direction, the groove depth changes gradually in a section near the axial middle part of the piston rod, and the change of sections near the two ends of the piston rod is aggravated.
7. The self-circulation piston rod for oil storage of the spiral micro-groove according to claim 1, wherein the cross section of the spiral micro-groove is arc-shaped, smooth arc transition is formed between the groove wall and the groove bottom, and round corner transition is formed between edges of two sides of the groove opening and the ridge surface of the outer circumferential surface of the piston rod.
8. The self-circulation piston rod for oil storage of the spiral micro-groove according to claim 1, wherein the cross section of the spiral micro-groove is rectangular, the groove wall and the groove bottom are intersected at right angles, and chamfer transition is arranged between the edges of two sides of the groove opening and the ridge surface of the outer circumferential surface of the piston rod.
9. The spiral micro-groove oil storage self-circulation piston rod according to claim 1, wherein the edge of the notch of the spiral micro-groove is provided with a smooth transition surface, and the smooth transition surface is used for smoothly connecting the groove wall and the ridge surface of the outer circumferential surface of the piston rod.
10. The self-circulation piston rod for oil storage of the spiral micro-groove according to claim 1, wherein the annular oil collecting groove is a plurality of annular grooves which are distributed at intervals along the axial direction of the inner hole of the guide sleeve, the cross section of the annular oil collecting groove is in a circular arc shape which is open towards the radial direction of the piston rod, and the opening width of the circular arc-shaped cross section at the inner hole wall surface of the guide sleeve is larger than the groove width of the spiral micro-groove.

Description

Automobile shock absorber ware piston rod of integrated self-lubricating noise cancelling structure Technical Field The invention relates to the technical field of automobile shock absorbers, in particular to an automobile shock absorber piston rod integrated with a self-lubricating noise-eliminating structure. Background In the automobile shock absorber, a piston rod axially reciprocates in a cylinder barrel, the piston rod penetrates through a guide sleeve and an oil seal, wherein the guide sleeve and the oil seal are fixed at the end part of the cylinder barrel, the guide sleeve provides radial support and axial guide, and the oil seal prevents shock absorption oil from leaking outwards. In the prior art, the piston rod lubricates the matching surface between the guide sleeve and the piston rod by means of natural adhesion of damping oil in the cylinder barrel to the outer surface of the rod body. However, when the piston rod goes up, the oil seal scrapes off the oil attached to the outer surface of the piston rod, so that when the piston rod goes down, the surface of the rod body is in a lean oil state and enters a guide sleeve area, the lubrication of the matching surface of the guide sleeve and the piston rod is insufficient, and dry friction abnormal sound is generated. This problem is particularly pronounced when the first action is performed after a low-temperature start or a long-term rest. Disclosure of Invention The invention provides a spiral micro-groove oil storage self-circulation piston rod, which solves the technical problems that in the prior art, when a piston rod ascends, an oil seal scrapes oil on the outer surface of the piston rod, so that when the piston rod descends, the surface of a rod body enters a guide sleeve area in a lean oil state, the lubrication of a matching surface between the guide sleeve and the piston rod is insufficient, and dry friction abnormal sound is generated. The invention discloses a spiral micro-groove oil storage self-circulation piston rod which is used for an automobile shock absorber and comprises a piston rod, a guide sleeve and an oil seal, wherein the piston rod penetrates through a cylinder barrel and makes reciprocating rectilinear motion along the axial direction of the cylinder barrel, the guide sleeve is fixedly connected to an inner hole at the opening end of the cylinder barrel, the oil seal is fixedly connected to the opening end of the cylinder barrel and is positioned at the outer side of the guide sleeve along the extending direction of the piston rod, a spiral micro-groove extending along a spiral line is formed in the outer circumferential surface of the piston rod, the spiral direction of the spiral micro-groove is set to generate pumping driving force towards the direction of the guide sleeve when the piston rod descends, the groove depth of the spiral micro-groove gradually becomes shallow from the axial middle part of the piston rod to two ends, the groove width is kept constant along the spiral stroke, a porous bronze sintered layer is covered on the outer surface of the piston rod, the thickness of the porous bronze sintered layer is smaller than the groove depth of the spiral micro-groove, an annular oil collecting groove extending along the circumferential direction is formed in the inner hole wall surface of the guide sleeve, and the spiral micro-groove is periodically communicated with the annular oil collecting groove when the piston rod reciprocates. Further, one end of the piston rod, which is far away from the extending end, is fixedly connected with a piston, the outer peripheral surface of the piston forms a sealing sliding fit with the inner wall of the cylinder barrel, the inner cavity of the cylinder barrel is divided into two oil cavities, and the damping oil is filled in the inner cavity of the cylinder barrel and the fit clearance between the piston rod and the guide sleeve. Further, the spiral micro-groove is a single-head spiral groove, and continuously extends along the outer circumferential surface of the piston rod at a constant spiral angle to form a single uninterrupted spiral channel. Further, the spiral micro grooves are multi-head spiral grooves, the plurality of spiral micro grooves are uniformly distributed along the circumferential direction of the outer circumferential surface of the piston rod, and the spiral direction and the spiral lift angle of each spiral micro groove are the same. Further, the groove depth of the spiral micro groove is linearly gradually changed along the axial direction, and the groove depth is gradually decreased from the axial middle part of the piston rod to the two ends at equal slopes. Further, the groove depth of the spiral micro groove is in nonlinear gradual change along the axial direction, the groove depth changes gradually in the section near the axial middle part of the piston rod, and the section near the two ends of the piston rod changes gradually. Further, the cr