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CN-121977017-A - Sliding bearing with polytetrafluoroethylene antifriction pad

CN121977017ACN 121977017 ACN121977017 ACN 121977017ACN-121977017-A

Abstract

The invention provides a sliding bearing with a polytetrafluoroethylene antifriction pad, which relates to the technical field of bearings, wherein when the antifriction pad and a friction ring are axially reduced in thickness due to abrasion, an upper cover and a lower cover are axially close to each other in the central line and a safety gap is reduced to a preset value, a driving piece pulls a binding rope, the lengths of the binding rope reserved in a deformation section and a friction section are reduced, all the deformation sections continue to be compressed, all the friction sections slide inwards along the radial direction of the central line and are close to each other, namely the friction ring integrally approaches and contracts towards the central line, the friction section pushes the antifriction pad and the upper cover to be synchronously away from the lower cover through conical surfaces so as to increase the safety gap, rigid interference and severe abrasion of the edges of the upper cover and the lower cover are avoided to a certain extent, the sealing integrity is ensured, the inside pollution caused by plastic dust is avoided, the smoothness of the relative rotation of the upper cover and the lower cover is ensured, the steering feel is ensured, the volume of an oil storage cavity is maintained, lubricating grease is reserved in the oil cavity, and the lubricating performance of the bearing is ensured.

Inventors

  • ZHAO HUI
  • REN HAIYU

Assignees

  • 山西新环精密制造股份有限公司

Dates

Publication Date
20260505
Application Date
20260409

Claims (10)

  1. 1. The sliding bearing with the polytetrafluoroethylene antifriction pad is characterized by comprising an upper cover, a lower cover, antifriction pads and a friction ring, wherein the axes of the upper cover and the lower cover are overlapped with the central line, the antifriction pads and the friction ring are positioned between the upper cover and the lower cover, when the upper cover and the lower cover rotate relatively, the antifriction pads and the friction ring rotate relatively, the friction ring comprises a plurality of deformation sections and friction sections which are alternately arranged in the circumferential direction of the central line, the deformation sections can deform in the circumferential direction of the central line, the deformation sections are always in a compression state, the friction sections are in sliding connection with the lower cover, the sliding direction is radial of the central line, the upper surface of each friction section is contacted with the lower surface of the antifriction pad, the contact surface is a conical surface, the tightening ropes are jointly penetrated in the circumferential direction of the deformation sections and the friction sections along the central line, the tightening ropes are in a tension state, two ends of each tightening rope are closed, and a driving piece is arranged between the upper cover and the lower cover, and the driving piece is used for pulling the tightening ropes, so that the lengths of the tightening ropes remained in the deformation sections and the friction sections are reduced; The upper cover and the lower cover are provided with a safety gap in the axial direction of the central line, when the safety gap is reduced to a preset value, the driving piece pulls the bundling rope to enable all deformation sections to be continuously compressed, all friction sections slide inwards along the radial direction of the central line, and the antifriction pad and the upper cover are pushed by the conical surface to be synchronously far away from the lower cover.
  2. 2. The slide bearing with a polytetrafluoroethylene antifriction pad according to claim 1 wherein the driving member is annular and has an axis coincident with the center line, the lower surface of the driving member contacts the lower cover and generates a first friction force, the upper surface of the driving member contacts the upper cover and generates a second friction force when the safety gap is reduced to a predetermined value, the first friction force is less than the second friction force, the friction ring rotates relative to the driving member when the safety gap is reduced to a predetermined value and the lower cover rotates relative to the upper cover, the driving member pulls the drawstring to move the upper cover away from the lower cover, and the upper surface of the driving member disengages from the upper cover.
  3. 3. The sliding bearing with the polytetrafluoroethylene antifriction pad according to claim 2 wherein the driving member has a plurality of connection points for pulling the drawstring, the plurality of connection points being evenly distributed along a circumference of the center line, and the driving member pulls the drawstring through the plurality of connection points when the friction ring rotates relative to the driving member.
  4. 4. A sliding bearing with a teflon antifriction pad according to claim 2 or 3 characterized in that a connection is provided between the lower cover and the driving member, which connection allows the friction ring to rotate in a first rotational direction relative to the upper cover and in a second rotational direction relative to the driving member when the safety gap is reduced to a predetermined value, which connection allows the friction ring to rotate in the second rotational direction in synchronization with the driving member.
  5. 5. The sliding bearing with the polytetrafluoroethylene antifriction pad according to claim 4 wherein the lower cover is provided with an inner ring which is located inside the driving member and has an axis coincident with the center line, the connecting portion includes a tooth groove located on the inner wall of the driving member and a tooth located on the outer wall of the inner ring, the tooth groove and the tooth are uniformly distributed along the circumferential direction of the center line, the tooth groove and the tooth can extend into the tooth groove or retract from the tooth groove, the tooth has a tendency to extend into the tooth groove, and when the tooth extends into the tooth groove, the friction ring can rotate in a first rotational direction relative to the driving member, and the friction ring and the driving member rotate synchronously in a second rotational direction.
  6. 6. The sliding bearing with a polytetrafluoroethylene antifriction pad according to claim 1 wherein the deformation section upper surface is spaced from the antifriction pad lower surface in the axial direction of the center line.
  7. 7. The sliding bearing with a polytetrafluoroethylene antifriction pad according to claim 6 wherein a first distance is provided between the upper surface of the deformed section and the lower surface of the antifriction pad in the axial direction of the center line, and the first distance gradually increases from the middle to both ends of the deformed section in the circumferential direction of the center line.
  8. 8. The sliding bearing with a polytetrafluoroethylene antifriction pad according to claim 7 wherein the end of the upper surface of the deformed section is lower than the end of the upper surface of the friction section in the circumferential direction of the center line, and a transition section is provided between the end of the upper surface of the deformed section and the end of the upper surface of the friction section.
  9. 9. The sliding bearing with polytetrafluoroethylene antifriction pad according to claim 1 wherein the drawstring is provided in at least two and juxtaposed inside and outside.
  10. 10. The sliding bearing with polytetrafluoroethylene antifriction pad according to claim 1 wherein the taper of the upper surface of the friction segment and the lower surface of the antifriction pad is less than 1:3.

Description

Sliding bearing with polytetrafluoroethylene antifriction pad Technical Field The invention relates to the technical field of bearings, in particular to a sliding bearing with polytetrafluoroethylene antifriction pads. Background With the rapid development of the automobile electric technology, the self weight of the automobile is increased, the driving comfort requirement is improved, and the performance of a sliding bearing which is a core component of a shock absorber system is more required. The automobile shock absorber sliding bearing is mainly used for connecting an automobile body and a suspension system, is required to bear axial and radial alternating loads and impact loads at the same time, and keeps stable working under the working condition of-40 ℃ to 100 ℃. At present, a bidirectional thrust bearing structure is commonly adopted in the industry to meet the requirement of multidirectional stress, and the bidirectional thrust bearing structure generally comprises an upper cover body, a lower cover body, a friction chip, lubricating grease and other components. In terms of materials, the upper cover body and the lower cover body are made of materials such as Polyoxymethylene (POM) and the like, and the supporting function is realized through good mechanical strength, and the friction chip is made of materials such as polypropylene (PP) and the like, and forms a friction pair with the upper cover body and the lower cover body so as to reduce abrasion. In the sealing design, labyrinth sealing is widely adopted due to small influence on torque and low cost, and rubber sealing is used in scenes with higher requirements on dustproof performance. In addition, in order to optimize the friction performance of the bearing, an antifriction pad made of Polytetrafluoroethylene (PTFE) is arranged between the upper cover body of the bearing and the friction plate, and the friction coefficient and torque can be effectively reduced due to the super lubricity of the PTFE, so that the service life of the product is prolonged. In sliding bearings employing labyrinth seals, a slight axial safety gap is typically designed between the upper and lower cover bodies to form a non-contact labyrinth seal while defining a specific volume of the internal oil storage chamber. However, as the core friction member is reduced in axial thickness due to wear over extended periods of service, irreversible axial proximity between the upper and lower cover bodies occurs under axial loading. The axial approach can lead to the reduction of a safety clearance, the rigid interference and severe abrasion of the edges of the upper cover body and the lower cover body caused by the bearing of partial axial load on the edges of the upper cover body and the lower cover body, the damage of the sealing integrity, the pollution of plastic dust to the inside, the influence of the smoothness of the relative rotation of the upper cover body and the lower cover body, the deterioration of steering feel, and the compression of the volume of an oil storage cavity between the upper shell body and the lower shell body, and the forced extrusion of the originally retained lubricating grease out of a sealing interface caused by the pumping effect, so that the bearing is rapidly dried and loses efficacy due to irreversible lubricating grease loss. The information disclosed in the background section of the invention is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art. Disclosure of Invention In view of the above, it is necessary to provide a slide bearing with a polytetrafluoroethylene antifriction pad in order to solve the problems of the conventional slide bearing. The above purpose is achieved by the following technical scheme: a sliding bearing with a polytetrafluoroethylene antifriction pad comprises an upper cover, a lower cover, antifriction pads and friction rings, wherein the axes of the upper cover and the lower cover are overlapped on a central line, the antifriction pads and the friction rings are positioned between the upper cover and the lower cover, when the upper cover and the lower cover rotate relatively, the antifriction pads and the friction rings rotate relatively, the friction rings comprise a plurality of deformation sections and friction sections which are alternately arranged in the circumferential direction of the central line, the deformation sections can deform in the circumferential direction of the central line, the deformation sections are always in a compressed state, the friction sections are in sliding connection with the lower cover and the sliding direction is the radial direction of the central line, the upper surface of each friction section is contacted with the lower surface of the antifriction pad, the contact surface is a conical s