CN209818716U

CN209818716U - Gear shifting device of motorcycle transmission

Info

Publication number: CN209818716U
Application number: CN201920600861.1U
Authority: CN
Inventors: 白虎珍; 张立成; 张林江; 潘江伟; 梁浩
Original assignee: Zhejiang Meikeda Motorcycle Co Ltd
Current assignee: Zhejiang Meikeda Motorcycle Co Ltd
Priority date: 2019-04-28
Filing date: 2019-04-28
Publication date: 2019-12-20
Anticipated expiration: 2029-04-28

Abstract

The utility model provides a gearshift of motorcycle derailleur belongs to motorcycle technical field. The gear shifting device solves the problem of how to save the arrangement space so as to improve the structural compactness of the gear shifting device. This gearshift is including setting up shift shaft and the variable speed drum on the casing, and shift epaxial is equipped with the shift arm that dials and can drive shift arm swing, is fixed with the fixed axle on the casing, rotates respectively on the fixed axle to be connected with the transmission turning arm and be used for locking the locking arm of variable speed drum, and the transmission turning arm is connected with the shift arm transmission and can drive the variable speed drum through drive mechanism and rotate. The gear shifting device is designed through the transmission connecting lever and the coaxial arrangement of the transmission connecting lever and the locking arm, so that the gear shifting device is more reasonable in structural arrangement, more favorable for saving arrangement space, and greatly improved in structural compactness.

Description

Gear shifting device of motorcycle transmission

Technical Field

The utility model belongs to the technical field of the motorcycle, a gearshift of motorcycle derailleur is related to.

Background

The speed variator of motorcycle is used for changing the transmission ratio of output shaft and input shaft, and the speed variator is driven by gear-selecting and shifting device to implement gear-shifting so as to meet the requirements for driving wheel traction force and different requirements for speed under the different running conditions of starting, accelerating and running, overcoming various road obstacles, etc. At present, on the existing motorcycle, the gear change is basically realized by operating a gear shifting arm on an engine.

Particularly, among the prior art, gearshift generally includes the input shaft that shifts, become to keep off the axle, set up at the epaxial change that shifts dial plate and the change that sets up on the variable speed drum of shifting and keep off the wheel, be equipped with drive mouth on the change and dial plate, it has a plurality of archs to become to keep off the wheel along the circumference distribution, it is located the drive mouth of the dial plate of shifting to become protruding on the wheel, it drives to shift the dial plate and rotates to become when the shift shaft, thereby utilize the interior lateral wall of drive mouth to promote protruding motion and make to shift the wheel rotation of keeping off, and finally drive variable speed drum rotates and accomplishes the shifting. After the gear shifting is completed, in order to avoid the gear jumping, a locking mechanism is generally designed independently to lock the gear shifting drum. For example, chinese patent [ application No.: 201521096576.9 discloses a shift drum shift mechanism, which comprises a shift drum, a shift arm and a shift shaft in transmission fit with the shift arm; the gear shifting drum is provided with a gear shifting turntable in a transmission fit mode, the gear shifting arm is provided with a gear shifting plate, the outer end of the gear shifting plate is matched with the gear shifting turntable and drives the gear shifting turntable to intermittently rotate by utilizing the reciprocating swing of the gear shifting plate, and the gear shifting shaft and the gear shifting arm are in transmission through a bevel gear, namely the gear shifting arm receives the gear shifting driving force of the gear shifting shaft to drive the gear shifting drum to complete gear shifting; the mechanism further comprises a gear locking mechanism, the gear locking mechanism comprises a gear locking groove arranged on the gear shifting turntable and a gear locking body embedded into the gear locking groove through elastic force, the gear locking body is arranged on one side of the speed changing drum in a rotating mode, the gear locking groove is arranged in a plurality of positions according to the gear number of the transmission, and after the gear shifting is completed by driving the speed changing drum to rotate through the gear shifting arm, the gear locking body is embedded into the gear locking groove to lock the rotation of the gear shifting turntable, and finally the transmission is prevented from jumping.

However, the shift mechanism of the shift drum has the following disadvantages: on one hand, as the gear shifting arm directly drives the speed changing drum to rotate through the gear shifting plate, in order to meet the requirement of a gear shifting angle, the gear shifting arm needs to be longer than the design of the gear shifting plate by obtaining an enough transmission ratio through the gear shifting plate, namely, the distance between the gear shifting arm and the speed changing drum needs to be larger, so that the gear shifting mechanism occupies a larger arrangement space, and the compactness of an arrangement structure is influenced; on the other hand, the lock mechanism is independently provided on the shift drum side, which further increases the compactness of the entire shift mechanism.

Disclosure of Invention

The utility model aims at having the above-mentioned problem to current technique, provided a gearshift of motorcycle derailleur, the technical problem that solve is how to practice thrift the compact structure nature of arranging the space in order to improve gearshift.

The purpose of the utility model can be realized by the following technical proposal: the gear shifting device of the motorcycle transmission comprises a shell, and comprises a gear shifting shaft and a gear shifting drum which are arranged on the shell, wherein the gear shifting shaft is provided with a gear shifting arm and can drive the gear shifting arm to swing.

The arrangement space of the gear shifting device is mainly limited by the influence of the distance between the gear shifting shaft and the gear shifting drum, and the gear shifting device of the motorcycle transmission has the following design principle in order to save the arrangement space and improve the structure compactness: different from direct transmission through the gear shifting arm between the gear shifting shaft and the gear shifting drum in the prior art, the utility model discloses a design transmission connecting lever and gear shifting plate transmission are connected, so borrow the transmission connecting lever to make the gear shifting arm enlarge the transmission ratio of the gear shifting drum, that is to say, the utility model discloses in, can reduce the design to the interaxial interval of gear shifting shaft and gear shifting drum, although above-mentioned interval reduces the design and can lead to the transmission length of gear shifting plate to need corresponding reduction design, but can compensate the influence that above-mentioned gear shifting plate reduces the design and enlargies whole transmission through the transmission ratio of above-mentioned transmission connecting lever enlargies to this demand that satisfies conventional gear shifting angle; from the above analysis, it can be known that the distance between the shift shaft and the shift drum can be designed to be smaller by the above design, thereby saving the layout space; meanwhile, the locking arm and the transmission crank arm which are used for locking the speed change drum are coaxially arranged on the fixed shaft by designing the fixed shaft fixed with the shell, namely the locking arm and the transmission crank arm are respectively and rotatably connected onto the fixed shaft, so that the influence of the transmission crank arms on the arrangement space is compensated, the arrangement space of the gear shifting device is further saved, and the structure compactness of the gear shifting device is further improved.

In the gear shifting device of the motorcycle transmission, the axial leads of the gear shifting shaft, the gear shifting drum and the fixed shaft are parallel to each other, and the gear shifting shaft, the gear shifting drum and the fixed shaft are arranged in a triangular shape. The triangular arrangement means that the axial leads of the three parts are not coplanar, and through the design of the triangular arrangement, the gear shifting device can utilize both the transverse space and the longitudinal space in a transmission shell, thereby avoiding the waste of space caused by arrangement along one direction and being beneficial to improving the structural compactness of the gear shifting device.

In the gear shifting device of the motorcycle transmission, the gear shifting drum is fixedly connected with the gear locking wheel, the gear locking wheel is provided with a plurality of tooth grooves, and the free end of the locking arm is pressed in the tooth grooves of the gear locking wheel through the elastic piece. When the speed changing drum finishes rotating and shifting gears, the locking arm is pressed in a tooth groove of the gear locking wheel through the elastic force of the elastic piece to prevent the gear locking wheel from freely rotating, and the locking arm is matched with the gear locking wheel in a locking mode to lock the speed changing drum after gear shifting adjustment. When the variable speed drum needs to rotate and shift gears, the tooth groove wall of the gear locking wheel can push the locking arm to overcome the elastic action of the elastic piece to realize unlocking.

In the above-described gearshift device for a motorcycle transmission, a lock wheel is rotatably connected to a free end of the lock arm, and the lock wheel is rotatable along an outer peripheral surface of the lock wheel and is pressed in a tooth groove of the lock wheel by an elastic member. Through the design of the locking wheel, the locking and unlocking operation between the locking arm and the gear wheel can be smoother.

In the above shifting device of the motorcycle transmission, the elastic member is a torsion spring, the torsion spring is sleeved on the fixed shaft, one end of the torsion spring is positioned on the fixed shaft or the housing, and the other end of the torsion spring is positioned on the locking arm. Through the design to above elastic component, the torsional spring also overlaps and establishes on the fixed axle promptly, has just so carried out make full use of to the space around the fixed axle to be favorable to improving gearshift's compact structure nature. Alternatively, the elastic member is a compression spring disposed between the housing and the lock arm, one end of the compression spring abuts against the housing, and the other end of the compression spring abuts against the lock arm.

In the gear shifting device of the motorcycle transmission, the transmission connecting lever is respectively provided with a first extension arm extending towards the gear shifting shaft and a second extension arm extending towards the gear shifting drum, the free end of the gear shifting arm is in transmission connection with the extension end of the first extension arm, and the extension end of the second extension arm can drive the gear shifting drum to rotate through the transmission mechanism; the length of the gear shifting arm is greater than the length of the first extension arm extending relative to the axis of the fixed shaft, and the length of the first extension arm extending relative to the axis of the fixed shaft is less than the length of the second extension arm extending relative to the axis of the fixed shaft. The gear shifting arm is designed by the structure of the transmission crank arm, so that transmission gear shifting operation is realized; the length of the gear shifting arm is designed to be the length of the extension arm I extending relative to the axis of the fixed shaft, so that the swing angle of the gear shifting arm can be amplified once by the extension arm I, and the design that the extension length of the extension arm I is smaller than that of the extension arm II is combined, so that the swing stroke obtained by the extension arm I is amplified by the extension arm II, namely, the transmission amplification effect of the transmission crank arm with the structural design on the speed change shifting plate is obvious, the gear shifting arm enables the swing angle and the swing stroke to be amplified through the transmission crank arm, and the small design of the transmission length of the gear shifting arm can meet the requirement of the conventional gear shifting angle; the axle distance between the speed changing shaft and the speed changing drum can be designed to be small, so that the arrangement space is saved, and the structural compactness of the gear shifting device is improved; in addition, the extension length of the first extension arm/the second extension arm extending relative to the axis of the fixed shaft refers to the vertical distance from the end of the first extension arm/the second extension arm to the axis of the fixed shaft.

In the gear shifting device of the motorcycle transmission, the transmission mechanism comprises a crank fixedly connected to a rotating shaft of the speed changing drum, the extending end of the extending arm II acts on the free end of the crank and can drive the crank to swing, and the swinging center line of the crank is positioned between the extending end of the extending arm II and the axis line of the fixed shaft. Through the design of the position of the crank, namely the direction of the free end of the crank is basically consistent with the extending direction of the extending arm, the free end of the crank and the extending direction of the extending arm can be partially overlapped in the same direction, so that the extending length of the extending arm II on the transmission crank can be designed to be long enough, the rotation stroke of the gear shifting arm is enlarged greatly through the transmission crank, the transmission length of the gear shifting arm can be further shortened, the conventional gear shifting requirement can be met, and the structural compactness can be improved; and, the partial overlapping arrangement of above-mentioned crank and extension arm two also is favorable to improving compactness.

In the above gearshift device for motorcycle transmission, the length of the crank is less than or equal to the extension length of the extension arm extending relative to the axis of the fixed shaft. When the length of crank is less than the extension length of extension arm one, the turned angle of above-mentioned transmission connecting lever can obtain articulate enlargies, that is to say, the turned angle of shifting gear shifting arm is through the enlargies back of extension arm one on the transmission connecting lever, the turned angle of extension arm one is through articulate enlargies again to further enlarge the turned angle of shifting gear shifting arm drive variable speed drum, thereby make the transmission length of shifting gear shifting arm can further reduce also can satisfy the conventional needs of shifting gears, and then be favorable to improving compact structure.

In the gear shifting device of the motorcycle transmission, the extending end of the extending arm II is provided with a strip-shaped sliding hole, the crank is provided with a sliding block capable of sliding in the strip-shaped sliding hole, and the sliding block is in a circular ring shape and is rotatably connected to the crank. Through the matching design of the strip-shaped sliding holes and the sliding blocks, the second extension arm can drive the crank to swing, and the design length of the second extension arm is not influenced, so that the transmission amplification of the gear shifting arm is not influenced, and the structural compactness of the gear shifting device is further ensured; as an equivalent scheme, the strip-shaped sliding hole can be arranged on the crank, and the sliding block is arranged on the second extension arm.

As another scheme, in the gear shifting device of the motorcycle transmission, the transmission mechanism comprises a crank fixedly connected to the rotating shaft of the speed changing drum and a guide strip positioned at the extending end of the second extension arm, rollers are respectively arranged on two sides of the guide strip, and the rollers are rotatably connected to the crank and can slide along the guide strip. When the extension arm rotates in one direction, the roller on one side slides along the guide strip, and when the extension arm rotates in the other direction, the roller on the other side slides along the guide strip, so that the extension arm II drives the crank to swing back and forth.

In the gear shifting device of the motorcycle transmission, the end surfaces of the gear shifting arm and the first extension arm are respectively provided with meshing teeth, and the gear shifting arm and the first extension arm are meshed and connected through the meshing teeth. The gear shifting arm drives the extension arm to swing in a gear transmission mode, and the meshing position of the meshing teeth is a contact part formed by the gear shifting arm and the extension arm in a contact mode. Alternatively, the end surfaces of the gear shifting arm and the first extension arm are friction surfaces. The gear shifting arm can also drive the extension arm to swing in a friction transmission mode.

In the gear shifting device of the motorcycle transmission, the gear shifting arm is sleeved on the gear shifting shaft, the gear shifting shaft is fixed with the rotating shifting plate, the gear shifting arm is provided with a limiting hole, the rotating shifting plate is provided with the shifting part, the shifting part extends into the limiting hole and can move in the limiting hole, the gear shifting shaft above the rotating shifting plate is further sleeved with a top plate, balls are arranged between the top plate and the rotating shifting plate, the shell is fixed with the limiting column, the top plate is provided with the limiting notch and is circumferentially positioned on the limiting column through the limiting notch, the upper surface of the rotating shifting plate is provided with concave surfaces and convex surfaces which are alternately arranged along the circumferential direction, the lower surface of the top plate is provided with corresponding concave surfaces and convex surfaces, and the rotating shifting plate can drive the top plate to axially move along the limiting column through rotating the balls along the concave surfaces and the convex surfaces. According to the structural design, the rotating shifting plate rotates by a certain angle firstly, so that a top plate for controlling clutch of the clutch is jacked up, the clutch is separated, then the shifting plate continues to rotate, and a shifting part on the shifting plate is in contact with the hole wall of the limiting hole to drive the shifting arm to swing, so that gear shifting operation is realized; meanwhile, as can be seen from the above analysis, the shift arm, the rotating dial plate for controlling clutch of the clutch, the top plate and the ball assembly are all arranged in the circumferential direction of the shift shaft, so that the arrangement space near the shift shaft can be fully utilized, and the compactness of the whole structure is improved.

Compared with the prior art, the gear shifting device of the motorcycle transmission has the following advantages: the gear shifting device is designed through the transmission connecting lever and the coaxial arrangement of the transmission connecting lever and the locking arm, so that the gear shifting device is more reasonable in structural arrangement, more favorable for saving arrangement space, and greatly improved in structural compactness.

Drawings

Fig. 1 is a schematic view of an assembly structure of a shifting apparatus according to a first embodiment of the present invention.

Fig. 2 is a schematic diagram of a partially exploded structure of the gear shifting device in the first embodiment.

Fig. 3 is a schematic diagram of a partially exploded structure of the gear shifting device in the first embodiment.

Fig. 4 is a schematic diagram of a partially exploded structure of the gear shifting device in the first embodiment.

Fig. 5 is a schematic plan view of the transmission between the shift lever and the transmission crank in the first embodiment.

In the figure, 1, a housing; 2. a gear shifting shaft; 3. a shift drum; 4. a gear shifting arm; 41. a limiting hole; 5. a transmission crank arm; 51. an extension arm I; 52. an extension arm II; 6. a crank; 7. a strip-shaped slide hole; 8. a slider; 9. meshing teeth; 10. rotating the shifting plate; 101. a toggle part; 11. a top plate; 111. a limiting notch; 12. a ball bearing; 13. a limiting column; 14. a concave surface; 15. a convex surface; 16. locking a catch wheel; 161. a tooth socket; 17. a fixed shaft; 18. a locking arm; 19. a locking wheel; 20. an elastic member.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

The first embodiment is as follows:

specifically, as shown in fig. 1 and fig. 2, the motorcycle transmission includes a housing 1, a gear shifting device includes a shift shaft 2 and a shift drum 3 rotatably connected to the housing 1, the shift shaft 2 is provided with a shift arm 4 and can drive the shift arm 4 to swing, the shift drum 3 is fixedly connected with a lock wheel 16 having a plurality of tooth grooves 161, the housing 1 is fixed with a fixing shaft 17, wherein the axial leads of the shift shaft 2, the shift drum 3 and the fixing shaft 17 are parallel to each other, and the shift shaft 2, the shift drum 3 and the fixing shaft 17 are arranged in a triangular manner. The fixed shaft 17 is respectively connected with a transmission crank arm 5 and a locking arm 18 for locking the locking wheel 16 in a rotating mode, the transmission crank arm 5 is in transmission connection with the gear shifting arm 4 and can drive the gear shifting drum 3 to rotate through a transmission mechanism, the free end of the locking arm 18 is connected with a locking wheel 19 in a rotating mode, and the locking wheel 19 can rotate along the outer peripheral surface of the locking wheel 16 and is pressed in a tooth groove 161 of the locking wheel 16 through an elastic piece 20. In this embodiment, the elastic member 20 is a torsion spring, the torsion spring is sleeved on the fixed shaft 17, one end of the torsion spring is positioned on the fixed shaft 17 or the housing 1, and the other end of the torsion spring is positioned on the locking arm 18.

More specifically, as shown in fig. 3 and 4, the transmission crank arm 5 is respectively provided with a first extension arm 51 extending towards the shift shaft 2 and a second extension arm 52 extending towards the shift drum 3, the end surfaces of the shift arm 4 and the first extension arm 51 are respectively provided with engaging teeth 9, the shift arm 4 and the first extension arm 51 are engaged and connected through the engaging teeth 9, and the extension end of the second extension arm 52 can drive the shift drum 3 to rotate through the transmission mechanism; as shown in FIG. 5, the length of the shift arm 4 is greater than the length of the first extension arm 51 extending relative to the axis of the fixed shaft 17, and the length of the first extension arm 51 extending relative to the axis of the fixed shaft 17 is less than the length of the second extension arm 52 extending relative to the axis of the fixed shaft 17.

As shown in fig. 3 and 4, the transmission mechanism in this embodiment includes a crank 6 fixedly connected to the rotation shaft of the shift drum 3, a bar-shaped sliding hole 7 is provided at the extending end of the second extension arm 52, a sliding block 8 capable of sliding in the bar-shaped sliding hole 7 is provided on the crank 6, and the sliding block 8 is annular and is rotatably connected to the crank 6. The swinging central line of the crank 6 is positioned between the extending end of the second extending arm 52 and the axis line of the fixed shaft 17. The length of the crank 6 is less than or equal to the extension length of the extension arm one 51 relative to the axis of the fixed shaft 17. Shift and dial 4 covers and establish on shifting axle 2, shift and be fixed with on the axle 2 and rotate and dial board 10, shift and dial and have spacing hole 41 on the arm 4, it has stirring portion 101 to rotate on dialling board 10, stirring portion 101 stretches into spacing hole 41 and can remove in spacing hole 41, it still overlaps on the axle 2 that shifts to rotate the shift of board 10 top and is equipped with roof 11, be equipped with ball 12 between roof 11 and the rotation dialling board 10, be fixed with spacing post 13 on the casing 1, have spacing notch 111 on roof 11 and pass through spacing notch 111 circumferential location on spacing post 13, the upper surface that rotates and dials board 10 is equipped with along circumference interval concave surface 14 and convex surface 15 of arranging in turn, be equipped with corresponding concave surface 14 and convex surface 15 on the lower surface of roof 11, it can make ball 12 drive roof 11 along spacing post 13 axial displacement along concave surface 14 and convex surface 15 through rotating to dial board 10, separation through the axial displacement control derailleur clutch of roof 11.

Example two:

the technical solution in this embodiment is substantially the same as the technical solution in the first embodiment, except that in this embodiment, the transmission mechanism includes a crank 6 fixedly connected to the rotation shaft of the shift drum 3 and a guide strip located at the extension end of the second extension arm 52, two sides of the guide strip are respectively provided with a roller, and the rollers are rotatably connected to the crank 6 and can slide along the guide strip. The end surfaces of the gear shifting arm 4 and the extension arm one 51 are friction surfaces.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although the terms of the housing 1, the shift shaft 2, the shift drum 3, the shift lever arm 4, the position limiting hole 41, the transmission crank arm 5, the first extension arm 51, the second extension arm 52, the crank 6, the bar-shaped slide hole 7, the slide block 8, the engaging teeth 9, the rotary dial plate 10, the dial portion 101, the top plate 11, the position limiting notch 111, the ball 12, the position limiting post 13, the concave surface 14, the convex surface 15, the lock gear wheel 16, the tooth groove 161, the fixed shaft 17, the lock arm 18, the lock wheel 19, the elastic member 20, etc. are used more frequently, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. The utility model provides a gearshift of motorcycle derailleur, the derailleur includes casing (1), gearshift is including setting up shift shaft (2) and variable speed drum (3) on casing (1), be equipped with on shift shaft (2) shift arm (4) and can drive shift arm (4) swing, its characterized in that, be fixed with fixed axle (17) on casing (1), rotate respectively on fixed axle (17) and be connected with transmission turning arm (5) and locking arm (18) that are used for locking variable speed drum (3), transmission turning arm (5) and shift arm (4) transmission are connected and can drive variable speed drum (3) through drive mechanism and rotate.

2. The gearshift device for motorcycle transmissions according to claim 1, wherein the axes of the gearshift shaft (2), the shift drum (3), and the stationary shaft (17) are parallel to each other, and the gearshift shaft (2), the shift drum (3), and the stationary shaft (17) are arranged in a triangular pattern.

3. The gearshift device for the motorcycle transmission according to claim 1 or 2, wherein the transmission connecting lever (5) is respectively provided with a first extension arm (51) extending towards the gearshift shaft (2) and a second extension arm (52) extending towards the shift drum (3), the free end of the gearshift arm (4) is in transmission connection with the extension end of the first extension arm (51), and the extension end of the second extension arm (52) can drive the shift drum (3) to rotate through a transmission mechanism; the length of the gear shifting and shifting arm (4) is greater than the length of the extension arm I (51) extending relative to the axis of the fixed shaft (17), and the extension length of the extension arm I (51) extending relative to the axis of the fixed shaft (17) is less than the extension length of the extension arm II (52) extending relative to the axis of the fixed shaft (17).

4. The gearshift device for motorcycle speed changer according to claim 3, characterized in that the transmission mechanism comprises a crank (6) fixed on the rotation shaft of the shift drum (3), the extension end of the extension arm II (52) acts on the free end of the crank (6) and can drive the crank (6) to swing, and the swing center line of the crank (6) is located between the extension end of the extension arm II (52) and the axis line of the fixed shaft (17).

5. Gearshift device for a motorcycle transmission according to claim 4, characterized in that the length of the crank (6) is less than or equal to the extension length of the extension arm one (51) with respect to the axis of the fixed shaft (17).

6. The gearshift of motorcycle speed changer according to claim 4, characterized in that the extension arm two (52) is provided with a bar-shaped sliding hole (7) at the extension end, the crank (6) is provided with a sliding block (8) capable of sliding in the bar-shaped sliding hole (7), and the sliding block (8) is annular and is rotatably connected to the crank (6).

7. The gearshift device for motorcycle transmissions according to claim 3, wherein the shift arm (4) and the extension arm one (51) have engagement teeth (9) on end surfaces thereof, respectively, and the shift arm (4) and the extension arm one (51) are engaged with each other via the engagement teeth (9).

8. Gear change device of a motorcycle transmission according to claim 1 or 2, characterised in that the shift drum (3) is attached with a latch wheel (16), that the latch wheel (16) has a number of tooth grooves (161), and that the free end of the locking arm (18) is pressed in the tooth groove (161) of the latch wheel (16) by means of a spring (20).

9. The gearshift of motorcycle transmission according to claim 8, characterized in that the elastic member (20) is a torsion spring, which is fitted over the stationary shaft (17), one end of which is positioned on the stationary shaft (17) or the housing (1), and the other end of which is positioned on the locking arm (18).

10. The gearshift device of motorcycle transmission according to claim 1 or 2, wherein the gearshift arm (4) is sleeved on the gearshift shaft (2), the gearshift shaft (2) is fixed with a rotary shifting plate (10), the gearshift arm (4) is provided with a limit hole (41), the rotary shifting plate (10) is provided with a shifting part (101), the shifting part (101) extends into the limit hole (41) and can move in the limit hole (41), the gearshift shaft (2) above the rotary shifting plate (10) is further sleeved with a top plate (11), balls (12) are arranged between the top plate (11) and the rotary shifting plate (10), the housing (1) is fixed with a limit column (13), the top plate (11) is provided with a limit notch (111) and is circumferentially positioned on the limit column (13) through the limit notch (111), the upper surface of the rotary shifting plate (10) is provided with concave surfaces (14) and convex surfaces (15) which are circumferentially arranged at intervals, be equipped with corresponding concave surface (14) and convex surface (15) on the lower surface of roof (11), it can make ball (12) drive roof (11) along concave surface (14) and convex surface (15) along spacing post (13) axial displacement to rotate group board (10) through rotating.