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CN-116464766-B - Gear structure for speed change switching assembly and gearbox

CN116464766BCN 116464766 BCN116464766 BCN 116464766BCN-116464766-B

Abstract

The invention provides a speed change switching assembly and a gear structure for a gearbox, which comprises a switching shaft, a guide surface and a pushing mechanism, wherein the switching shaft is coaxially and rotatably connected with a connecting piece and a switching gear, a protrusion for limiting the rotation angle of the connecting piece is further arranged on the switching shaft, a limiting piece which can be clamped with the connecting piece is arranged on the switching gear, the guide surface is configured on the limiting piece and/or the connecting piece so as to push the connecting piece to deflect, and the pushing mechanism is connected with the connecting piece so as to push the connecting piece to axially slide along the connecting piece. The invention solves the problems that when the electric vehicle shifts gears in a variable speed, a motor is required to drive a conversion shaft and a connecting piece to rotate in advance in the variable speed switching assembly in the prior art, otherwise, the connecting piece is easy to cause that the connecting piece cannot be smoothly meshed with a conversion gear, and the speed is failed.

Inventors

  • XIAO FULU
  • WU GANG

Assignees

  • 重庆市佳南工贸有限公司

Dates

Publication Date
20260508
Application Date
20230320

Claims (10)

  1. 1. A shift switching assembly, comprising: The conversion shaft (1) is coaxially and rotatably connected with a connecting piece (2) and a conversion gear (3), a bulge for limiting the rotation angle of the connecting piece (2) is further arranged on the conversion shaft (1), and a limiting piece (5) which can be clamped with the connecting piece (2) is arranged on the conversion gear (3); A guide surface (211) which is arranged on the limiting piece (5) and/or the coupling piece (2) to push the coupling piece (2) to deflect; And a pushing mechanism (6) connected with the coupling member (2) to push the coupling member (2) to slide along the axial direction thereof.
  2. 2. A transmission shift assembly as defined in claim 1, wherein: The limiting piece (5) comprises first internal teeth (501) coaxially arranged on the conversion gear (3); the coupling (2) comprises a body and first external teeth (212) arranged on the body, wherein the first external teeth (212) can be embedded in the first internal teeth (501).
  3. 3. A transmission shift assembly as defined in claim 1, wherein: the limiting piece (5) comprises second external teeth protruding towards the coupling piece (2); The coupling (2) comprises a body and second internal teeth (214) arranged on the ring side of the body, wherein a clamping groove (215) for embedding the second external teeth is formed between tooth grooves of the second internal teeth (214) and the body.
  4. 4. A gear change shifting assembly according to claim 2 or 3, characterized in that the maximum swivel angle of the coupling member (2) is an integer multiple of the ratio of the radian between two adjacent teeth on the coupling member (2).
  5. 5. A gear change shifting assembly according to claim 4, characterized in that said guiding surface (211) is triangular.
  6. 6. A gear change switching assembly according to claim 5, characterized in that the guide surfaces (211) are provided on the facing flanks of the coupling element (2) and the limiting element (5), respectively.
  7. 7. A gear change shifting assembly according to claim 4, characterized in that said projection comprises a key (4) projecting axially along said shift shaft (1), the ratio of teeth on said coupling member (2) to the number of said keys (4) being 3:1.
  8. 8. A gear structure for a transmission, comprising: The conversion shaft (1) is coaxially and rotatably connected with a connecting piece (2) and conversion gears (3), the two conversion gears (3) are arranged on two sides of the connecting piece (2), a power mechanism for driving the conversion shaft (1) to rotate is arranged on the conversion shaft (1), a protrusion for limiting the rotation angle of the connecting piece (2) is also arranged on the conversion shaft (1), and each conversion gear (3) is provided with a limiting piece (5) which can be alternatively clamped with the connecting piece (2); A guide surface (211) which is arranged on the limiting piece (5) and/or the coupling piece (2) to push the coupling piece (2) to deflect; And a pushing mechanism (6) connected with the coupling member (2) to push the coupling member (2) to slide along the axial direction thereof.
  9. 9. A gear structure for a gearbox according to claim 8, characterised in that said propulsion mechanism (6) comprises: one end of the connecting rod is rotatably connected to the connecting piece (2) along the axial direction of the conversion shaft (1); And the pull rod (604) is fixedly connected with the other end of the connecting rod so as to drive the connecting rod to axially move along the conversion shaft (1).
  10. 10. A gear structure for a gearbox according to claim 9, characterized in that said coupling (2) further comprises: -an intermediate slot (203) in the shape of a ring to house the connecting rod; And the connecting gears comprise first connecting gears (201) and second connecting gears (202) which are distributed on two sides of the middle groove (203), and the first connecting gears (201) and the second connecting gears (202) are respectively opposite to the two conversion gears (3).

Description

Gear structure for speed change switching assembly and gearbox Technical Field The invention relates to the technical field of gearboxes, in particular to a speed change switching assembly and a gear structure for a gearbox. Background The existing electric vehicle generally adopts a two-gear transmission for gear shifting, for example, in the patent with the application number of CN202020060522.1, a connecting piece and two conversion gears are coaxially arranged on the same conversion shaft, a plurality of key grooves which can be meshed with the connecting piece are formed in the end faces of the two conversion gears, and then the connecting piece can be pushed to slide along the conversion shaft so as to be meshed with the key grooves on the conversion gears, so that the connecting piece is driven to rotate, and the function of speed change of the electric vehicle is finally realized by meshing the conversion gears with different gear ratios. However, when the transmission shifts gears, the connecting piece is required to slide along the axial direction of the conversion shaft and be embedded in the key slot, and the rotated connecting piece cannot be directly aligned with the key slot of the conversion gear, so that in the process, the motor is required to provide source power or rotating speed for the conversion shaft in advance, so that the connecting piece is driven to rotate until the connecting piece is aligned with the key slot and the clamping connection is smoothly completed. When the electric vehicle in the prior art is in a stationary state and the structure is used for speed change and gear shift, the motor is required to drive the conversion shaft and the connecting piece to rotate in advance, otherwise, the connecting piece is easy to be incapable of being smoothly meshed with the conversion gear, and the speed change is caused to be failed. Disclosure of Invention The first object of the present invention is to provide a gear shifting assembly, which solves the problem that when an electric vehicle shifts gears in a stationary state, the gear shifting assembly in the prior art needs a motor to drive a conversion shaft and a coupling member to rotate in advance, otherwise, the coupling member cannot be smoothly meshed with a conversion gear, and the gear shifting is failed. According to an embodiment of the present invention, a shift switching assembly includes: The conversion shaft is coaxially and rotatably connected with a connecting piece and a conversion gear, a protrusion for limiting the rotation angle of the connecting piece is further arranged on the conversion shaft, and a limiting piece which can be clamped with the connecting piece is arranged on the conversion gear; a guide surface configured on the limiting piece and/or the coupling piece to push the coupling piece to deflect; And a pushing mechanism connected with the coupling member to push the coupling member to slide along the axial direction thereof. Compared with the prior art, the invention has the advantages that the pushing mechanism is utilized to drive the connecting piece to slide until the guiding surface on the limiting piece/connecting piece contacts with the connecting piece/limiting piece, at the moment, the connecting piece is forced to deflect until being clamped in the limiting piece under the oblique driving of the guiding surface, namely, when the speed change gear is switched and clamped, the invention can spontaneously deflect the connecting piece until being clamped in the limiting piece under the linear pushing action of the pushing mechanism by utilizing the guiding surface without providing source power for the conversion shaft in advance to rotate. According to one embodiment, the limiting member comprises a first internal tooth coaxially arranged on the conversion gear; the coupling includes a body and first external teeth disposed on the body, the first external teeth being fittable within the first internal teeth. According to one embodiment, the stop comprises second external teeth protruding towards the coupling; The coupling includes a body and second internal teeth provided on a ring side of the body, and a groove for engaging the second internal teeth is formed between the tooth groove of the second internal teeth and the body. According to one embodiment, the ratio of the maximum angle of revolution of the coupling to the arc between two adjacent teeth on the coupling is an integer multiple. According to one embodiment, the guide surface is triangular. According to one embodiment, the guide surfaces are provided on opposite tooth surfaces of the coupling member and the limiting member, respectively. According to one embodiment, the projection comprises a key projecting axially along the conversion shaft, the tooth on the coupling member having a 3:1 ratio to the number of keys. The second objective of the present invention is to provide a gear structure for a gearbox, which solves the pro