Speed change device of electric motorcycle

Abstract

The utility model provides a speed change device of an electric motorcycle, and belongs to the technical field of speed change. The problem of insufficient safety is solved. The low-speed input gears, the transmission assembly and the high-speed input assembly are sequentially arranged on the output shaft in a sleeving mode in the axial direction, a one-way clutch mechanism is arranged between the low-speed input gears, the transmission assembly is in circumferential linkage with the output shaft, and the output shaft is further sleeved with a rotatable wedging assembly. The wedging assembly is located between the high-speed input assembly and the transmission assembly and enables the high-speed input assembly and the transmission assembly to be linked in the circumferential direction during rotation, the wedging assembly can slide along the output shaft, and at least one elastic supporting piece is arranged between the wedging assembly and the high-speed input assembly and acts on the wedging assembly and the high-speed input assembly in the axial direction of the output shaft. A coil is arranged in the high-speed input assembly and can be electrified to generate magnetic attraction force to attract the wedging assembly. The device has the advantages of higher safety, simple structure and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of variable speed technology relates to the variable speed device of electric motorcycle. BACKGROUND

[0002] The existing electric motorcycle will be through setting up automatic speed change mechanism to realize the switching between low speed and high speed. For example the transmission mechanism in the automatic speed change device disclosed in patent application No. 202210742235.2, it includes output shaft, set up on the output shaft and can with its clutch low speed input component, set up on the output shaft high speed input piece and with the output shaft along the circumference linkage and can with high speed input piece clutch transmission assembly, low speed input component includes low speed input gear, the inner ring of being arranged in the inner side of low speed input gear and being arranged between the inner ring and low speed input gear and can make the circumferential linkage or slip of two of roller one, the inner ring is covered in the output shaft outside and both along the circumferential linkage. High speed input piece is hinged with two drive blocks, when high speed input piece rotates two drive blocks can swing and drive transmission assembly to rotate. Transmission assembly includes the inner ring of being covered on the output shaft and with the output shaft forms linkage relationship and the outer ring of being axially fixed to the outer of inner ring, the output shaft is also covered with the rotatable control disc, a plurality of roller two between the inner ring and outer ring are controlled by the control disc, the outer side of inner ring has a plurality of movable grooves, each roller two is located in the corresponding movable groove, when the control disc rotates relative to the inner ring can drive roller two along the movable groove movement makes the outer ring and inner ring along the circumferential linkage or break away. The outer ring and high speed input piece are circumferentially fixed, the control disc has the extension head that is cylindrical at the center of one side of high speed input piece, high speed input piece is also fixed with two magnetic blocks, drive block and magnetic block interval arrangement, the one end of each drive block is respectively adsorbed on the corresponding magnetic block, two drive blocks are arranged at the extension head outside of control disc. Drive block is arc block, the one end of drive block is clamping part, the hinge point of drive block and high speed input piece is located close to clamping part position, the other end of drive block and magnetic block cooperate, the length of the one end of drive block and magnetic block cooperation to the hinge point of drive block is greater than the length of the end of clamping part to the hinge point of drive block. High speed input piece includes high speed input gear and the chassis that is circumferentially fixed with high speed input gear, two drive blocks and two magnetic blocks are arranged on the chassis, the edge of chassis has the notch, the outer ring has the connecting piece that is inserted into the notch and makes the chassis and outer ring form circumferentially fixed.

[0003] The transmission mechanism in the automatic transmission device is mainly used for electric motorcycle. When the vehicle is running at low speed, the low-speed input gear and the high-speed input gear both receive power to rotate at low speed, and the rotation speed of the high-speed input gear is not enough to make the driving blocks swing inwards to overcome the magnetic force of the magnetic blocks. At this time, the power is transmitted from the low-speed input gear to the inner ring through the roller one, and then transmitted to the output shaft to make it rotate. When the vehicle is running at high speed, the low-speed input gear and the high-speed input gear both receive power to rotate at high speed, and the rotation speed of the high-speed input gear is increased to make the two driving blocks swing to overcome the magnetic force of the magnetic blocks. Thus, the clamping parts of the two driving blocks will clamp outside the extension head of the control disc and drive the control disc to rotate, so that the control disc controls the roller two to move along the active groove to make the outer ring and the inner ring move in the circumferential direction. The outer ring drives the inner ring to rotate at high speed, and finally the power is transmitted to the output shaft to make it rotate at high speed (the low-speed input assembly and the output shaft are slipping in this state).

[0004] After the actual installation is completed, the output shaft is perpendicular to the tire. As known above, when the vehicle is running at low speed, the driving blocks are adsorbed on the magnetic blocks and do not swing, and this structure is not a problem on a flat road. If the road is uneven, the vehicle will constantly fluctuate during driving, especially when driving through a larger pit, because of the large height difference, the vehicle will be subjected to a large impact, and the impact force generated in this case is enough to make the driving blocks swing uncontrollably to overcome the magnetic force of the magnetic blocks. Since the driving blocks are required to swing when the vehicle is switched from low speed to high speed, it is obvious that if the driving blocks swing during low-speed driving of the vehicle, it will inevitably affect the driving vehicle, and in severe cases, even a rollover phenomenon will occur, so the transmission mechanism in the above automatic transmission device also has the problem of insufficient safety. Content of the utility model

[0005] The utility model aims at the above problems existing in the prior art, and provides a transmission device of an electric motorcycle, which solves the problem of insufficient safety.

[0006] The utility model can be realized by the following technical schemes.

[0007] The transmission device of the electric motorcycle comprises an output shaft, a low-speed input gear, a transmission assembly and a high-speed input assembly which are sequentially sleeved on the output shaft in the axial direction, a one-way clutch mechanism is arranged between the low-speed input gears, the transmission assembly is circumferentially connected with the output shaft, and a rotatable wedge assembly is further sleeved on the output shaft, the wedge assembly is located between the high-speed input assembly and the transmission assembly and can make the two circumferentially connected when rotating, characterized in that the wedge assembly can slide along the output shaft, at least one elastic support is arranged between the wedge assembly and the high-speed input assembly and acts on the wedge assembly and the high-speed input assembly in the axial direction of the output shaft, a coil is arranged in the high-speed input assembly, and the coil can be electrified to generate a magnetic attraction force to attract the wedge assembly.

[0008] When the electric motorcycle is running at low speed, the motor outputs a small rotating speed, so that the low-speed input gear and the high-speed input gear rotate at low speed. At this time, the power is transmitted from the low-speed input gear to the output shaft through the one-way clutch mechanism. In this process, the coil is not electrified and does not generate a magnetic attraction force, the high-speed input assembly rotates freely relative to the wedge assembly, and the wedge assembly is supported by the elastic force of the elastic support and is in a state of separation from the high-speed input assembly.

[0009] When the electric motorcycle needs to run at high speed, the user controls the motor to output a large rotating speed and controls the coil to be electrified (in practice, a button can be directly arranged on the handlebar, and the coil can be electrified when the button is pressed). With the increase of the rotating speed of the motor, the low-speed input gear and the high-speed input assembly rotate at high speed, and the coil generates a magnetic attraction force after being electrified. The wedge assembly is attracted to the high-speed input assembly by the magnetic attraction force and overcomes the action of the elastic support. In this way, the high-speed input assembly rotates with the wedge assembly, and the high-speed input assembly and the transmission assembly are circumferentially connected with the movement of the wedge assembly. Therefore, the high-speed input assembly drives the transmission assembly to rotate at high speed, and finally the power is transmitted to the output shaft through the transmission assembly to make it rotate at high speed. Since the rotating speed of the output shaft is greater than that of the low-speed input gear at this time, the output shaft overcomes the low-speed input gear, and the two form a slip.

[0010] The transmission device of the electric motorcycle sets the coil in the high-speed input assembly and combines the wedge assembly which can slide along the output shaft and be attracted by the magnetic attraction force generated by the coil. In this way, the combination between the high-speed input assembly and the transmission assembly is realized by directly using the magnetic attraction force generated by the electrification of the coil to attract the wedge assembly when switching from low speed to high speed. The use of the driving block in the prior art is cancelled, and the safety hazard caused by the uncontrolled swinging of the driving block is eliminated, thereby improving the safety. At the same time, the structure is also simpler.

[0011] In the above-mentioned speed change device of the electric motorcycle, the high-speed input assembly is provided with an annular mounting cavity, and the coil is arranged in the mounting cavity; the high-speed input assembly is provided with a plurality of through holes in the circumferential direction towards the wedge assembly, and the through holes are communicated with the mounting cavity.

[0012] The through holes can reduce the influence of the magnetic attraction generated by the coil after being electrified, and ensure that the wedge assembly can be firmly adsorbed on the high-speed input assembly to form linkage.

[0013] In the above-mentioned speed change device of the electric motorcycle, the mounting cavity is provided with a polyurethane foaming layer, and the polyurethane foaming layer seals the coil in the mounting cavity.

[0014] The coil is sealed in the mounting cavity by the polyurethane foaming layer, which can avoid impurities or lubricating oil from entering the mounting cavity through the through holes to affect the normal work of the coil.

[0015] In the above-mentioned speed change device of the electric motorcycle, the wedge assembly is provided with a number of mounting holes I consistent with the elastic supporting members, the elastic supporting members include supporting springs and balls arranged in the mounting holes I, and the balls abut against the high-speed input assembly.

[0016] When the coil is electrified to generate magnetic attraction, the wedge assembly is adsorbed on the high-speed input assembly, the balls are extruded into the mounting holes I and compress the supporting springs. After the coil is de-energized, the wedge assembly is no longer subjected to magnetic attraction, the supporting springs reset and push the wedge assembly away from the high-speed input assembly. The arrangement of the balls can ensure that the high-speed input assembly will not drive the wedge assembly to rotate together under the friction force in the low-speed state.

[0017] In the above-mentioned speed change device of the electric motorcycle, as another technical solution, the high-speed input assembly is provided with a number of mounting holes II consistent with the elastic supporting members, the elastic supporting members include supporting springs and balls arranged in the mounting holes II, and the balls abut against the wedge assembly.

[0018] In the above-mentioned speed change device of the electric motorcycle, the high-speed input assembly includes a high-speed input gear, a rotating disc, a mounting seat and an outer ring, the outer ring is located on one side of the rotating disc and fixed in the circumferential direction, the transmission assembly includes a transmission disc located on the inner side of the outer ring, the wedge assembly is connected between the outer ring and the transmission disc, the other side of the rotating disc is provided with a cylindrical portion in the center area, the cylindrical portion is fixed in the circumferential direction with the high-speed input gear, the mounting seat is annular, the mounting seat is fixed on the cylindrical portion in the axial direction, one side of the mounting seat is provided with an annular groove, and the mounting cavity is surrounded by the groove wall of the annular groove and the side wall of the rotating disc provided with the cylindrical portion.

[0019] The high-speed input gear in the high-speed input assembly is used to receive the driving force of the motor. The transmission disc is located inside the outer ring, and the wedge assembly is connected between the outer ring and the transmission disc. The outer ring is fixed in the circumferential direction of the rotating disc, and the cylindrical part of the rotating disc is fixed in the circumferential direction of the high-speed input gear. Thus, when the wedge assembly links the outer ring and the transmission disc in the circumferential direction, the driving force received by the high-speed input gear can be smoothly transmitted to the transmission disc. In addition, the mounting cavity capable of providing a mounting position for the coil is formed by the cooperation of the mounting seat and the cylindrical part, ensuring that the speed change device of the electric motorcycle can realize gear shifting from low speed to high speed in an electric control manner.

[0020] In the above-mentioned speed change device of the electric motorcycle, a bearing is arranged between the mounting seat and the cylindrical part. The side of the mounting seat is provided with a wire outlet hole. The side of the mounting seat is further provided with a tab-shaped connecting part protruding therefrom. The connecting part is provided with a connecting hole.

[0021] The wire outlet hole is used to pass the wire. If the mounting seat is directly fixed to the rotating disc, the wire will be bent and twisted when the high-speed input assembly rotates, and the wire may be broken or pulled off after a long time of use. Therefore, by arranging a bearing between the mounting seat and the rotating disc, and by protruding a tab-shaped connecting part from the side of the mounting seat, the connecting part is provided with a connecting hole. In this way, the mounting seat and the housing of the speed change device of the electric motorcycle can be fixed together through the connecting hole and the fixing part to ensure that the mounting seat is always fixed.

[0022] In the above-mentioned speed change device of the electric motorcycle, the cylindrical part is provided with an abutting step on the outside. A positioning step is arranged in the center hole of the mounting seat. The same side of the bearing is abutted against the positioning step and the abutting sleeve. The cylindrical part is further provided with an annular clamping groove. A clamping spring is arranged in the annular clamping groove. The other side of the bearing is abutted against the clamping spring.

[0023] Through the above arrangement, the mounting seat is fixed together with the rotating disc in the axial direction, so that the magnetic attraction generated when the coil is energized can stably attract the wedge assembly.

[0024] In the above-mentioned speed change device of the electric motorcycle, the wedge assembly includes a control disc and a plurality of one-way wedge rollers. The elastic support member acts on the control disc. The side edge of the control disc opposite to the rotating disc is provided with a plurality of protrusions in the circumferential direction. Each protrusion is located between the inner wall of the outer ring and the outer wall of the transmission disc. Each one-way wedge roller is arranged between two adjacent protrusions.

[0025] Compared with the prior art, the transmission device of the electric motorcycle directly utilizes the magnetic attraction force generated by the coil energization to attract the wedge assembly to realize the combination between the high-speed input assembly and the transmission assembly when switching from low speed to high speed, cancels the use of the driving block in the prior art, and thus eliminates the safety hazard caused by the uncontrolled swing of the driving block, and improves the safety. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic view of the transmission device of the electric motorcycle.

[0027] Figure 2 is a sectional view of the transmission device of the electric motorcycle (coil non-energized state).

[0028] Figure 3 is Figure 2 the sectional view of A-A direction in

[0029] Figure 4 is a structural schematic view of the wedge assembly.

[0030] In the figure, 1 is an output shaft, 2 is a low-speed input gear, 3 is a transmission assembly, 4 is a high-speed input assembly, 5 is a wedge assembly, 6 is an inner ring, 7 is a one-way combination roller, 8 is an elastic support, 8a is a supporting spring, 8b is a ball, 9 is a coil, 10 is a mounting cavity, 11 is a polyurethane foaming layer, 12 is a high-speed input gear, 13 is a rotating disc, 13a is a through hole, 13b is a columnar part, 14 is a mounting seat, 14a is a wire outlet hole, 14b is a connecting part, 14c is a connecting hole, 15 is an outer ring, 16 is a transmission disc, 16a is a matching block, 17 is a bearing, 18 is a control disc, 18a is a mounting hole, 18b is a protruding block, 19 is a one-way wedge roller, 20 is a wedge disc, 20a is an arc-shaped matching groove, 21 is an outer cover, 22 is a friction block, 23 is a disc, 24 is an abutting block, 25 is a buffer spring, 26 is an acting spring, and 27 is a clamping spring. DETAILED DESCRIPTION

[0031] The following is a specific embodiment of the present application and further describes the technical scheme of the present application in combination with the drawings, but the present application is not limited to these embodiments.

[0032] Embodiment one

[0033] For example, Figure 1 and Figure 2As shown, the transmission device of the electric motorcycle comprises an output shaft 1, a low-speed input gear 2, a transmission assembly 3 and a high-speed input assembly 4 which are sequentially sleeved on the output shaft 1 in the axial direction, a one-way clutch mechanism is arranged between the low-speed input gear 2 and the output shaft 1, the transmission assembly 3 is circumferentially linked with the output shaft 1, and a rotatable wedge assembly 5 is further sleeved on the output shaft 1, the wedge assembly 5 is located between the high-speed input assembly 4 and the transmission assembly 3 and can make the two assemblies circumferentially linked when rotating. The one-way clutch mechanism comprises an inner ring 6 and a plurality of one-way combination rollers 7, the inner ring 6 is axially fixed on the output shaft 1 and located at the inner side of the low-speed input gear 2, each one-way combination roller 7 is located between the inner wall of the low-speed input gear 2 and the outer wall of the inner ring 6, the low-speed input gear 2 will drive the inner ring 6 to rotate through each one-way combination roller 7 when rotating, and when the rotating speed of the output shaft 1 is greater than that of the low-speed input gear 2, overrunning will be formed, that is, the inner ring 6 slips with the low-speed input gear 2, and the working principle can refer to the structure of the existing one-way clutch. The wedge assembly 5 can slide along the output shaft 1, at least one elastic supporting piece 8 is arranged between the wedge assembly 5 and the high-speed input assembly 4 and acts on the wedge assembly 5 and the high-speed input assembly 4 in the axial direction of the output shaft 1, a coil 9 is arranged in the high-speed input assembly 4, the coil 9 can be electrified to generate a magnetic attraction force to attract the wedge assembly 5. Specifically, the high-speed input assembly 4 is provided with an annular mounting cavity 10, the coil 9 is arranged in the mounting cavity 10, a plurality of through holes 13a are circumferentially arranged on the high-speed input assembly 4 towards the wedge assembly 5, and the through holes 13a are communicated with the mounting cavity 10. A polyurethane foaming layer 11 is arranged in the mounting cavity 10, and the polyurethane foaming layer 11 seals the coil 9 in the mounting cavity 10. The wedge assembly 5 is provided with a number of mounting holes 18a consistent with the elastic supporting pieces 8, the elastic supporting pieces 8 comprise supporting springs 8a and balls 8b arranged in the mounting holes 18a, and the balls 8b abut against the high-speed input assembly 4.

[0034] As Figure 2 and Figure 4As shown, the high-speed input assembly 4 comprises a high-speed input gear 12, a rotating disc 13, a mounting seat 14, and an outer ring 15 located on one side of the rotating disc 13 and fixed in the circumferential direction (in practice, a plurality of notches can be provided on the edge of the rotating disc 13, and the outer ring 15 is provided with a plurality of tabs inserted into the notches). The transmission assembly 3 comprises a transmission disc 16 located inside the outer ring 15, and the wedge assembly 5 is connected between the outer ring 15 and the transmission disc 16. The other side of the rotating disc 13 is protrusively provided with a cylindrical portion 13b, which is circumferentially fixed with the high-speed input gear 12 by means of concave-convex cooperation. The mounting seat 14 is annular, and is fixed on the cylindrical portion 13b in the axial direction. One side of the mounting seat 14 is provided with an annular groove, and the mounting cavity 10 is surrounded by the groove wall of the annular groove and the side wall of the rotating disc 13 provided with the cylindrical portion 13b. A bearing 17 is arranged between the mounting seat 14 and the cylindrical portion 13b. The side of the mounting seat 14 is provided with a wire outlet hole 14a, and the side of the mounting seat 14 is further protrusively provided with a tab-shaped connecting portion 14b provided with a connecting hole 14c. The outer side of the cylindrical portion 13b is provided with an abutting step, and the center hole of the mounting seat 14 is provided with a positioning step. The same side of the bearing 17 is abutted against the positioning step and the abutting sleeve at the same time. The outer side of the cylindrical portion 13b is further provided with an annular clamping groove, and the annular clamping groove is provided with a clamping spring 27. The other side of the bearing 17 is abutted against the clamping spring 27. The wedge assembly 5 comprises a control disc 18 and a plurality of one-way wedge rollers 19. A mounting hole 18a is arranged on the control disc 18. A plurality of protrusions 18b are protrusively arranged on the side edge of the control disc 18 away from the rotating disc 13 in the circumferential direction. Each protrusion 18b is located between the inner wall of the outer ring 15 and the outer wall of the transmission disc 16. Each one-way wedge roller 19 is arranged between two adjacent protrusions 18b. The side of the transmission disc 16 is provided with a plurality of wedge grooves in the circumferential direction. Each one-way wedge roller 19 is located in each wedge groove. When the control disc 18 rotates relative to the transmission disc 16, it can drive the one-way wedge roller 19 to move along the wedge groove to make the outer ring 15 and the transmission disc 16 move in the circumferential direction. The transmission disc 16 is abutted against the control disc 18, and a tension spring is further arranged therebetween. The tension spring is used to realize the reset of the control disc 18 driving the one-way wedge roller 19. The wedge assembly 5 in the embodiment is of a prior structure. How the wedge assembly 5 realizes the circumferential linkage between the outer ring 15 and the transmission disc 16 belongs to the prior art. For example, it is described in detail in the variable speed mechanism of the variable speed transmission device with patent application number 202011297355.3 disclosed before, and in the embodiment of the transmission mechanism of the automatic variable speed device with patent application number 202210742235.2 mentioned in the background art.

[0035] Further, as Figure 2 and Figure 3As shown, the transmission assembly 3 further comprises a wedge plate 20, an outer cover 21, friction blocks 22 and a disc 23, the wedge plate 20 and the outer cover 21 are sleeved on the output shaft 1, the outer cover 21 is circumferentially fixed with the output shaft 1 through the spline, the inner ring 6 is located on one side of the outer cover 21 and is circumferentially fixed through the concave-convex cooperation, the wedge plate 20 is provided with an arc-shaped cooperation groove 20a concentrically arranged with the output shaft 1, the transmission disc 16 is provided with a cooperation block 16a located in the cooperation groove, and the arc-shaped cooperation groove 20a is further provided with an abutting block 24, the cooperation block 16a and the abutting block 24 and the abutting block 24 and one end groove wall of the arc-shaped cooperation groove 20a are all abutted with buffer springs 25, in practice, the number of the arc-shaped cooperation grooves 20a is two, and the structures in each arc-shaped cooperation groove 20a are the same. The wedge plate 20 is partially located in the outer cover 21, the number of the friction blocks 22 is several, and each friction block 22 is located between the outer wall of the wedge plate 20 and the inner wall of the outer cover 21, and the wedge plate 20 can push each friction block 22 in the radial direction when rotating. The disc 23 is located on the inner side of each friction block 22 and abuts against the wedge plate 20, which is equivalent to that the disc 23 and the transmission disc 16 are located on both sides of the wedge plate 20, the disc 23 is provided with a plurality of positioning holes in the circumferential direction, each positioning hole is provided with an acting spring 26, each acting spring 26 abuts against the friction block 22 and makes the friction block 22 contact the inner wall of the outer cover 21.

[0036] In practice, the speed change device of the electric motorcycle further comprises a transmission shaft for receiving the power of the motor, the transmission shaft is provided with a low-speed output gear meshing with the low-speed input gear 2 and a high-speed output gear meshing with the high-speed input gear 12, the transmission ratio of the low-speed output gear to the low-speed input gear 2 is greater than the transmission ratio of the high-speed output gear to the high-speed input gear 12, and the rotation speed of the high-speed input gear 12 is always greater than that of the low-speed input gear 2 due to the transmission ratio.

[0037] When the electric motorcycle is running at low speed, the motor outputs a small rotation speed, and the low-speed input gear 2 and the high-speed input gear 12 both rotate at low speed. At this time, the power is transmitted from the low-speed input gear 2 to the inner ring 6 through the one-way combination roller 7, and the inner ring 6 directly drives the output shaft 1 to rotate through the outer cover 21. In this process, the coil 9 is not electrified and does not generate magnetic attraction force, the high-speed input assembly 4 rotates freely relative to the control disc 18, and the control disc 18 is supported by the elastic force of the elastic support 8 and is separated from the rotating disc 13 as shown. Figure 2 Figure 3

[0038] ​When the electric motorcycle needs to go at high speed, the user controls the motor to output a high speed and controls the coil 9 to be electrified (in practice, a button can be directly arranged on the handlebar, and when the button is pressed, the coil 9 is electrified). With the increase of the motor speed, the low-speed input gear 2 and the high-speed input gear 12 rotate at high speed, and the coil 9 generates a magnetic attraction force after being electrified, the control disc 18 is attracted to the rotating disc 13 under the action of the magnetic attraction force and overcomes the action of the elastic support 8, and the control disc 18 is attracted to the rotating disc 13, so that the high-speed input gear 12 rotates with the control disc 18, and the one-way wedge roller 19 is driven by the control disc 18 to move along the wedge groove to make the outer ring 15 and the transmission disc 16 move in the circumferential direction, so that the outer ring 15 drives the transmission disc 16 to rotate at high speed, and finally the power is transmitted to the output shaft 1 through the whole transmission assembly 3 to make it rotate at high speed, and because the speed of the output shaft 1 is greater than that of the low-speed input gear 2 at this time, the low-speed input gear 2 and the inner ring 6 are formed to slip. The power transmission process in the whole transmission assembly 3 is as follows: with the rotation of the transmission disc 16, the matching block 16a arranged thereon moves along the arc-shaped matching groove 20a and compresses the buffer spring 25, until the buffer spring 25 is compressed to the position, so that the wedge disc 20 also starts to rotate, and then the wedge disc 20 pushes each friction block 22 to the inner side wall of the outer cover 21 in the radial direction, so that the outer cover 21 also starts to rotate at high speed and drives the output shaft 1 to rotate together. After the coil 9 is disconnected, the control disc 18 is separated from the rotating disc 13 under the action of the elastic force of the elastic support 8.

[0039] The speed change device of the electric motorcycle combines the high-speed input assembly 4 and the transmission assembly 3 by using the magnetic attraction force generated by the coil 9 to attract the wedge assembly 5 when switching from low speed to high speed, cancels the use of the driving block in the prior art, and eliminates the safety hazard caused by the uncontrolled swinging of the driving block, thereby improving the safety.

[0040] Embodiment two

[0041] The structure and principle of this embodiment are basically the same as those of embodiment one, and the difference is that in this embodiment, the rotating disc 13 of the high-speed input assembly 4 is provided with a number of mounting holes two consistent with the elastic support 8, the support spring 8a and the ball 8b are arranged in the mounting hole two, and the ball 8b abuts against the control disc 18 of the wedge assembly 5.

[0042] The specific embodiments described in the present text are only illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. A transmission device for an electric motorcycle, comprising an output shaft (1), a low-speed input gear (2), a transmission assembly (3) and a high-speed input assembly (4) which are sequentially sleeved on the output shaft (1) in an axial direction, a one-way clutch mechanism is arranged between the low-speed input gear (2), the transmission assembly (3) is circumferentially linked with the output shaft (1), and a rotatable wedge assembly (5) is further sleeved on the output shaft (1), the wedge assembly (5) is located between the high-speed input assembly (4) and the transmission assembly (3) and can make the two circumferentially link when rotating, characterized in that, The wedge assembly (5) can slide along the output shaft (1), at least one elastic support (8) is arranged between the wedge assembly (5) and the high-speed input assembly (4), the elastic support (8) acts on the wedge assembly (5) and the high-speed input assembly (4) along the axial direction of the output shaft (1), the high-speed input assembly (4) is provided with a coil (9), the coil (9) can be electrified to generate a magnetic attraction force to attract the wedge assembly (5).

2. The electric motorcycle transmission device according to claim 1, characterized by, The high-speed input assembly (4) is provided with an annular mounting cavity (10), the coil (9) is arranged in the mounting cavity (10), and the high-speed input assembly (4) is provided with a plurality of through holes (13a) along the circumference towards the wedge assembly (5), the through holes (13a) are communicated with the mounting cavity (10).

3. The electric motorcycle transmission device according to claim 2, wherein The mounting cavity (10) is provided with a polyurethane foaming layer (11), and the polyurethane foaming layer (11) seals the coil (9) in the mounting cavity (10).

4. The electric motorcycle transmission device according to claim 1 or 2 or 3, characterized by, The wedge assembly (5) is provided with a number of mounting holes (18a) corresponding to the elastic supports (8), the elastic supports (8) comprise support springs (8a) arranged in the mounting holes (18a) and balls (8b), and the balls (8b) abut against the high-speed input assembly (4).

5. The electric motorcycle transmission device according to claim 1 or 2 or 3, characterized by, The high-speed input assembly (4) is provided with a number of mounting holes (18a) corresponding to the elastic supports (8), the elastic supports (8) comprise support springs (8a) arranged in the mounting holes (18a) and balls (8b), and the balls (8b) abut against the wedge assembly (5).

6. The electric motorcycle transmission device according to claim 2 or 3, characterized by, The high-speed input assembly (4) comprises a high-speed input gear (12), a rotating disc (13), a mounting seat (14) and an outer ring (15), the outer ring (15) is located on one side of the rotating disc (13) and the two are circumferentially fixed, the transmission assembly (3) comprises a transmission disc (16) located on the inner side of the outer ring (15), the wedge assembly (5) is connected between the outer ring (15) and the transmission disc (16), the other side of the rotating disc (13) is provided with a columnar portion (13b) in the central region, the columnar portion (13b) is circumferentially fixed with the high-speed input gear (12), the mounting seat (14) is annular, the mounting seat (14) is fixed on the columnar portion (13b) in the axial direction, one side of the mounting seat (14) is provided with an annular groove, and the mounting cavity (10) is surrounded by the groove wall of the annular groove and the side wall of the rotating disc (13) provided with the columnar portion (13b).

7. The electric motorcycle transmission of claim 6, wherein, The mounting seat (14) and the columnar portion (13b) are provided with a bearing (17), the side of the mounting seat (14) is provided with a wire outlet hole (14a), and the side of the mounting seat (14) is further provided with a sheet-shaped connecting portion (14b) protruding outward, and the connecting portion (14b) is provided with a connecting hole (14c).

8. The electric motorcycle transmission of claim 7, wherein, The outer side of the columnar portion (13b) is provided with an abutting step, the center hole of the mounting seat (14) is provided with a positioning step, the same side of the bearing (17) abuts against the positioning step and the abutting sleeve at the same time, the outer side of the columnar portion (13b) is further provided with an annular clamping groove, the annular clamping groove is provided with a clamping spring (27), and the other side of the bearing (17) abuts against the clamping spring (27).

9. The electric motorcycle transmission device according to claim 1 or 2 or 3, characterized by, The wedge assembly (5) comprises a control disc (18) and a plurality of one-way wedge rollers (19), the elastic support (8) acts on the control disc (18), the side edge of the control disc (18) opposite to the rotating disc (13) is provided with a plurality of protrusions (18b) in the circumferential direction, each protrusion (18b) is located between the inner wall of the outer ring (15) and the outer wall of the transmission disc (16), and each one-way wedge roller (19) is arranged between two adjacent protrusions (18b).

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