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CN-224214679-U - Variable speed drum

CN224214679UCN 224214679 UCN224214679 UCN 224214679UCN-224214679-U

Abstract

The utility model relates to the technical field of transmission systems, in particular to a variable speed drum, which comprises a gear shifting drum rod, a gear shifting sleeve and a torsion spring, wherein the gear shifting sleeve and the torsion spring are arranged on the gear shifting drum rod, one end of the torsion spring is in butt joint with the gear shifting drum rod, the other end of the torsion spring is in butt joint with the gear shifting sleeve, and the gear shifting sleeve is provided with a first gear shifting groove. The speed changing drum is small in structure, is used for enabling the lifting gear to be smooth when the speed changing box is lifted and blocked, greatly reduces the abrasion and damage risks of the speed changing box, prolongs the service life, reduces the failure rate and the use cost, and can effectively solve the problems that the existing speed changing box needs to stop stepping down and is broken due to stay wires or deformed and blocked pawls. The gear shifting drum is used for driving the gear-withdrawing piece to move in gear shifting of the gearbox so as to enable the gear-withdrawing piece to synchronously move with the elastic shifting fork mechanism or drive the elastic shifting fork mechanism and the gear-withdrawing piece to synchronously move, and adopts a gear shifting drum rod, a gear shifting sleeve and a torsion spring mounting structure, so that the gear-withdrawing piece can be effectively prevented from being blocked when being abutted against the top of the gear-withdrawing protrusion, and the smooth gear shifting control of the gearbox is ensured.

Inventors

  • CHEN LIJIANG
  • ZHAO HUIXING
  • TAN YANG

Assignees

  • 卓克骑行科技(重庆)有限公司

Dates

Publication Date
20260508
Application Date
20250619

Claims (6)

  1. 1. A gear shift drum is characterized by comprising a gear shift drum stick (01), a gear shift sleeve (02) and a torsion spring (03) which are arranged on the gear shift drum stick (01), One end of the torsion spring (03) is abutted with the gear shifting drum stick (01), and the other end of the torsion spring (03) is abutted with the gear shifting sleeve (02), wherein the gear shifting sleeve (02) is provided with a first gear shifting groove (04); When the gear shift drum stick (01) rotates towards one direction, the gear shift drum stick (01) pushes the gear shift sleeve (02) to rotate, and when the gear shift drum stick (01) rotates towards the other direction, the gear shift drum stick (01) presses the torsion spring (03), and the torsion spring (03) presses the gear shift drum stick (01) to enable the gear shift drum stick (01) to push the gear shift sleeve (02) to rotate through the torsion spring (03).
  2. 2. The gear shift drum according to claim 1, wherein a first abutting table (011) is axially arranged on the gear shift drum rod (01), a second abutting table (021) is axially arranged on the gear shift sleeve (02), one end of the torsion spring (03) abuts against the first abutting table (011), and the other end of the torsion spring (03) abuts against the second abutting table (021); When the gear shift drum stick (01) rotates towards one direction, the first abutting table (011) abuts against the second abutting table (021) so that the gear shift drum stick (01) pushes the gear shift sleeve (02) to rotate, when the gear shift drum stick (01) rotates towards the other direction, the first abutting table (011) presses the torsion spring (03), the torsion spring (03) presses the second abutting table (021), and the gear shift drum stick (01) pushes the gear shift sleeve (02) to rotate through the torsion spring (03).
  3. 3. The shift drum according to claim 2, wherein the first abutment table (011) is provided with a first spring groove (0111), and the second abutment table (021) is provided with a second spring groove (0211); One end of the torsion spring (03) is arranged in the first spring groove (0111), and the other end of the torsion spring (03) is arranged in the second spring groove (0211).
  4. 4. The gear shift drum according to claim 2, wherein the gear shift drum stick (01) is provided with an installation section (012) and a grooving section (013), the gear shift sleeve (02) is sleeved on the installation section (012), and the first abutting table (011) is arranged at the end of the grooving section (013).
  5. 5. The shift drum as claimed in claim 2, wherein a radial space (05) for abutment of the torsion spring (03) is provided between the first abutment table (011) and the second abutment table (021), one end of the torsion spring (03) is located at one end portion of the radial space (05), and the other end of the torsion spring (03) is located at the other end portion of the radial space (05).
  6. 6. A shift drum according to any one of claims 1-5, characterized in that the shift drum stick (01) is provided with a shift fork shift groove (014).

Description

Variable speed drum Technical Field The utility model relates to the technical field of transmission systems, in particular to a variable speed drum. Background In a transmission system of a gearbox, a gear shifting control system is needed for shifting in order to realize a mechanism for transmitting change between different gear pairs of the gearbox. As shown in fig. 1, in a conventional transmission, pawls of a shift operating system are provided in a countershaft. During gear shifting, the pulling wire is pulled by hand to push and block the pawl in the auxiliary shaft. When the load of the gearbox needs to be shifted, the pawl cannot be withdrawn due to the fact that the pawl is pulled, at the moment, the pawl is pulled out forcefully to be disengaged after the pedal is stopped, and the risks of broken pull wires, deformed pawl and blocked and the like exist. Based on the above-mentioned disadvantages of gearboxes, there is a need to provide a solution to overcome the above-mentioned technical problems. Disclosure of utility model Aiming at the defects of the prior art, the utility model provides the speed changing drum which has a small structure, is used for enabling the lifting gear to be smooth when being used in the lifting gear of the speed changing box, greatly reduces the abrasion and damage risks of the speed changing box, prolongs the service life, reduces the failure rate and the use cost, and can effectively solve the problems that the existing speed changing box needs to stop stepping down, has broken stay wires or deformed and blocked pawls and the like. In order to solve the technical problems, the utility model adopts the following technical scheme: The utility model provides a gear shifting drum, which comprises a gear shifting drum rod, a gear shifting sleeve and a torsion spring, wherein the gear shifting sleeve and the torsion spring are arranged on the gear shifting drum rod, one end of the torsion spring is in butt joint with the gear shifting drum rod, the other end of the torsion spring is in butt joint with the gear shifting sleeve, the gear shifting sleeve is provided with a first gear shifting groove, when the gear shifting drum rod rotates in one direction, the gear shifting drum rod pushes the gear shifting sleeve to rotate, when the gear shifting drum rod rotates in the other direction, the gear shifting drum rod extrudes the torsion spring, and the torsion spring extrudes the gear shifting drum rod, so that the gear shifting drum rod pushes the gear shifting sleeve to rotate through the torsion spring. Further, a first abutting table is arranged in the axial direction of the gear shifting drum rod, a second abutting table is arranged in the axial direction of the gear shifting sleeve, one end of the torsion spring abuts against the first abutting table, the other end of the torsion spring abuts against the second abutting table, when the gear shifting drum rod rotates towards one direction, the first abutting table abuts against the second abutting table to enable the gear shifting drum rod to push the gear shifting sleeve to rotate, and when the gear shifting drum rod rotates towards the other direction, the first abutting table presses the torsion spring, and the torsion spring presses the second abutting table to enable the gear shifting drum rod to push the gear shifting sleeve to rotate through the torsion spring. Further, the first abutting table is provided with a first spring groove, the second abutting table is provided with a second spring groove, one end of the torsion spring is arranged in the first spring groove, and the other end of the torsion spring is arranged in the second spring groove. Further, the gear shifting drum stick is provided with a mounting section and a slotting section, the gear shifting sleeve is sleeved on the mounting section, and the first abutting table is arranged at the end part of the slotting section. Further, a radial space for abutting the torsion spring is arranged between the first abutting table and the second abutting table, one end of the torsion spring is located at one end portion of the radial space, and the other end of the torsion spring is located at the other end portion of the radial space. Preferably, the shift drum stick is provided with a shift fork shift groove. The utility model has the beneficial effects that: The speed changing drum is small in structure, is used for enabling the lifting gear to be smooth when the speed changing box is lifted and blocked, greatly reduces the abrasion and damage risks of the speed changing box, prolongs the service life, reduces the failure rate and the use cost, and can effectively solve the problems that the existing speed changing box needs to stop stepping down and is broken due to stay wires or deformed and blocked pawls. The gear shifting drum is used for driving the gear-withdrawing piece to move in gear shifting of the gearbox so as to enable the gear-withdrawing piece