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CN-117267282-B - Intermediate shaft brake

CN117267282BCN 117267282 BCN117267282 BCN 117267282BCN-117267282-B

Abstract

The invention belongs to the technical field of braking equipment, and discloses an intermediate shaft brake which comprises a shell assembly, a piston, a friction assembly and a constraint piece, wherein the shell assembly is provided with a working cavity, the intermediate shaft stretches into the working cavity, the periphery of the piston is attached to the inner cavity wall of the working cavity, one side of the piston, which is opposite to the intermediate shaft, forms an air cavity together with the working cavity, the shell assembly is provided with an air duct which is communicated with the air cavity, the friction assembly comprises a first friction plate and a second friction plate, the first friction plate is fixed on the intermediate shaft, the piston can move towards the intermediate shaft and can push the second friction plate to tightly abut against the first friction plate, the constraint piece comprises a fixing pin and a constraint plate, the fixing pin is fixed in the working cavity and axially parallel to the intermediate shaft, the constraint plate is fixed on the piston and provided with a first sliding groove, and the constraint plate slides along the axial direction of the fixing pin through the first sliding groove. The intermediate shaft brake can effectively avoid the piston from rotating around the circumferential direction of the intermediate shaft brake, and improves the durability and the reliability of sealing and the performance of the brake.

Inventors

  • GAO ZHIFEI
  • YANG KUN
  • ZHAO DA
  • LIU LIBO
  • YANG SHUAI
  • Zhou Xiongkuan
  • WU YULIANG

Assignees

  • 一汽解放汽车有限公司

Dates

Publication Date
20260512
Application Date
20231026

Claims (7)

  1. 1. An intermediate shaft brake, comprising: the shell assembly (1) is provided with a working cavity (101), and the intermediate shaft (6) penetrates through the shell assembly (1) and stretches into the working cavity (101); the piston (2) is movably arranged in the working cavity (101), the periphery of the piston (2) is attached to the inner cavity wall of the working cavity (101), an air cavity (102) is formed by one side, opposite to the intermediate shaft (6), of the piston (2) and the working cavity (101), and an air duct (111) communicated with the air cavity (102) is formed in the shell assembly (1); The friction assembly (3) is arranged in the working cavity (101) and comprises a first friction plate (31) and a second friction plate (32), the first friction plate (31) is fixed on the intermediate shaft (6), and the piston (2) moves towards the intermediate shaft (6) and can push the second friction plate (32) to tightly abut against the first friction plate (31); The restraint piece (4) is arranged in the working cavity (101) and comprises a fixed pin (41) and a restraint piece (42), the fixed pin (41) is fixed in the working cavity (101) and is axially arranged in parallel with the intermediate shaft (6), the restraint piece (42) is fixed on the piston (2) and is provided with a first sliding groove (421), and the restraint piece (42) slides along the axial direction of the fixed pin (41) through the first sliding groove (421); The constraint piece (42) is provided with a clamping connector (422), the piston (2) is correspondingly provided with a clamping groove (21), and the clamping connector (422) is fixedly clamped in the clamping groove (21); The restraining piece (42) is provided with a raised head (423) in a protruding mode along the circumferential direction of the restraining piece, the first sliding groove (421) is correspondingly formed in the raised head (423), and the piston (2) is provided with a caulking groove (22) corresponding to the raised head (423); The automatic hydraulic oil pump is characterized in that a return spring (5) is further arranged in the working cavity (101), the return spring (5) is located between the piston (2) and the intermediate shaft (6), the return spring (5) can enable the piston (2) to always have a trend of moving towards one side away from the intermediate shaft (6), the intermediate shaft (6) is provided with a containing groove (62), one end of the return spring (5) facing the intermediate shaft (6) stretches into the containing groove (62) and abuts against the bottom of the containing groove (62), a sleeve head (51) is sleeved at one end of the return spring (5) facing the piston (2), a sleeve head (25) corresponding to the sleeve head (51) is correspondingly arranged on the piston (2), and one end of the return spring (5) facing the piston (2) is abutted against the sleeve head (25) on the piston (2) through the sleeve head (51).
  2. 2. Intermediate shaft brake according to claim 1, characterized in that the second friction plate (32) is provided with a second slide groove (321), the second friction plate (32) being slidable along the fixing pin (41) via the second slide groove (321).
  3. 3. Intermediate shaft brake according to claim 2, characterized in that the fixing pins (41) are uniformly distributed at intervals along the axial direction of the intermediate shaft (6), and the first sliding grooves (421) of the restraining plates (42) and the second sliding grooves (321) of the second friction plates (32) are arranged in one-to-one correspondence with the fixing pins (41).
  4. 4. The intermediate shaft brake according to claim 1, characterized in that a spline groove (61) is formed in the outer peripheral wall of one end of the intermediate shaft (6) extending into the working chamber (101), a sleeve hole is formed in the first friction plate (31), and a spline (311) corresponding to the spline groove (61) is formed in the inner peripheral wall of the sleeve hole.
  5. 5. The intermediate shaft brake according to claim 1, characterized in that a main air groove (231) is formed in one side, facing away from the intermediate shaft (6), of the piston (2), a plurality of air dividing grooves (232) are formed in the outer edge of the main air groove (231) along the circumferential direction of the piston (2), the air dividing grooves (232) are communicated with the main air groove (231), and the air dividing grooves (231), the air dividing grooves (232) and the working cavity (101) jointly form the air cavity (102).
  6. 6. Intermediate shaft brake according to claim 1, characterized in that the piston (2) is fixedly sleeved with a sealing ring (24), the sealing ring (24) being fitted to the inner cavity wall of the working chamber (101).
  7. 7. Intermediate shaft brake according to claim 1, characterized in that the friction pack (3) is provided with a plurality of groups at intervals in the axial direction of the intermediate shaft (6), the first friction plates (31) and the second friction plates (32) of the friction pack (3) being alternately arranged in the axial direction of the intermediate shaft (6).

Description

Intermediate shaft brake Technical Field The invention relates to the technical field of braking equipment, in particular to an intermediate shaft brake. Background At present, most mechanical automatic transmission (Automated Mechanical Transmission, abbreviated as AMT) main boxes adopt a sliding gear sleeve mode to shift, the rotating speed of a target gear is required to be reduced during gear shifting, namely, the rotating speed of an intermediate shaft is reduced through the action of a brake, and when the rotating speed reaches a reasonable target value range, gear shifting is carried out, so that stable gear shifting is realized. After each upshift is completed, the return spring is required to push the jacking sleeve to return, and the jacking sleeve pushes the piston to return. In the prior art, in the working process of the transmission, the intermediate shaft is in a rapid rotation state, relative rotation is generated among the piston, the return spring and the intermediate shaft, the piston rotates around the circumferential direction of the piston due to friction of the return spring and other factors, the piston and a sealing ring sleeved by the piston are twisted, abnormal abrasion and early failure of a sealing element are caused, and the torque of a brake can be influenced by air leakage and oil leakage of the sealing element, so that the performance and durability of the brake are influenced. Disclosure of Invention The invention aims to provide the intermediate shaft brake, which has a simple structure, and can effectively prevent the piston in the intermediate shaft brake from rotating around the circumferential direction of the piston in the intermediate shaft brake in the working process, so that the durability and the reliability of sealing and the performance of the brake are improved. To achieve the purpose, the invention adopts the following technical scheme: an intermediate shaft brake comprising: The shell assembly is provided with a working cavity, and the intermediate shaft penetrates through the shell assembly and stretches into the working cavity; The piston is movably arranged in the working cavity, the periphery of the piston is attached to the inner cavity wall of the working cavity, an air cavity is formed by one side, opposite to the intermediate shaft, of the piston and the working cavity, and an air channel communicated with the air cavity is formed in the shell; The friction assembly is arranged in the working cavity and comprises a first friction plate and a second friction plate, the first friction plate is fixed on the intermediate shaft, and the piston moves towards the intermediate shaft to push the second friction plate to tightly abut against the first friction plate; The restraining piece is arranged in the working cavity and comprises a fixing pin and a restraining piece, the fixing pin is fixed in the working cavity and is axially parallel to the intermediate shaft, the restraining piece is fixed on the piston and is provided with a first sliding groove, and the restraining piece slides along the axial direction of the fixing pin through the first sliding groove. Preferably, the constraint piece is provided with a clamping connector, the piston is correspondingly provided with a clamping groove, and the clamping connector is fixedly clamped in the clamping groove. Preferably, the restraining piece is provided with a protruding head along the circumferential direction of the restraining piece, the first sliding groove is correspondingly arranged on the protruding head, and the piston is provided with a caulking groove corresponding to the protruding head. Preferably, the second friction plate is provided with a second sliding groove, and the second friction plate can slide along the fixing pin through the second sliding groove. Preferably, the fixing pins are uniformly distributed at intervals along the axial direction of the intermediate shaft, and the first sliding grooves of the constraint plates and the second sliding grooves of the second friction plates are respectively arranged in one-to-one correspondence with the fixing pins. Preferably, a spline groove is formed in the outer peripheral wall of one end, extending into the working cavity, of the intermediate shaft, a sleeve hole is formed in the first friction plate, and a spline corresponding to the spline groove is correspondingly formed in the inner peripheral wall of the sleeve hole. Preferably, a main air groove is formed in one side, facing away from the intermediate shaft, of the piston, a plurality of air dividing grooves are formed in the outer edge of the main air groove along the circumferential direction of the piston, the air dividing grooves are communicated with the main air groove, and the main air groove, the air dividing grooves and the working cavity jointly form the air cavity. Preferably, the piston fixing sleeve is provided with a sealing ring, and the sealing ring is attached t