Continuously variable transmission and motorcycle

Abstract

The invention relates to the field of motorcycle transmissions, and discloses a continuously variable transmission and a motorcycle, the continuously variable transmission comprises a speed change mechanism and an externally-hung execution mechanism, the speed change mechanism comprises a belt pulley shell cover, the belt pulley shell cover is provided with an output assembly, a transmission part and an input assembly, and the transmission part is used for transmitting power between the output assembly and the input assembly; the externally-hung executing mechanism comprises an externally-hung shell, the externally-hung shell is arranged on the side, away from the motorcycle body, of the belt wheel shell cover, a limiting part, a driving part, a driving gear, an intermediate gear and a driven gear are arranged in the externally-hung shell, the driving gear, the intermediate gear and the driven gear are sequentially meshed, a threaded part is arranged on the driven gear and is in threaded connection with an inner lead screw, and the driving part drives the inner lead screw to move axially. Therefore, the primary belt pulley driving wheel is driven to axially move. The device is reliable, efficient and suitable for large-torque stepless speed change.

Description

Technical Field

[0001] The present invention relates to the field of motorcycle transmissions, and specifically to continuously variable transmissions and motorcycles. Background Art

[0002] In the domestic motorcycle CVT field, the centrifugal roller type continuously variable transmission technology is mainly adopted, and its working principle relies on the radial sliding of the centrifugal roller on the variable speed disk to achieve the adjustment of the transmission ratio. This technology has the following significant defects: 1. Low transmission efficiency; since the pulley continuously variable transmission system relies on the friction transmission of the belt and the pulley disk, the transmission efficiency is relatively low, resulting in higher fuel consumption; 2. Low reliability and high maintenance cost: Although the structure is simple, components such as the pulley disk are prone to wear and need to be replaced regularly.

[0003] 3. Limited application range: Due to the relatively low transmission efficiency, the pulley continuously variable transmission system is usually used for small-displacement models and is not suitable for high-performance motorcycles with large torque output.

[0004] Although electromagnetic direct drive ECVT devices have been developed abroad, they are all built-in in the power assembly, with a relatively complex structure, requiring an internal lubrication system to provide lubrication, a mechanical displacement sensor, a two-stage gear transmission system, a small speed ratio, and are mainly installed on small-displacement motorcycles. Summary of the Invention

[0005] The present invention aims to provide a continuously variable transmission and a motorcycle with reliable, efficient, and continuously variable suitable for large torque.

[0006] To achieve the above object, the present invention adopts the following technical solution: a continuously variable transmission and a motorcycle, including a speed change mechanism and an external execution mechanism. The speed change mechanism includes a pulley housing cover, on which an output assembly, a transmission member, and an input assembly are provided. The transmission member is used to transmit power between the output assembly and the input assembly; The input assembly includes a primary pulley fixed wheel, a primary pulley movable wheel, and a main input shaft. Both the primary pulley fixed wheel and the primary pulley movable wheel are arranged on the main input shaft, and the primary pulley movable wheel is arranged on the side away from the motorcycle body; The external execution mechanism includes an external housing, which is arranged on the side of the pulley housing cover away from the motorcycle body. The external housing is internally provided with a limiting portion, a driving member, and a driving gear, an intermediate gear, and a driven gear that are sequentially engaged. A threaded portion is provided on the driven gear, and an internal lead screw is threadedly connected to the threaded portion. The driving member drives the internal lead screw to axially move, thereby driving the primary pulley movable wheel to axially move.

[0007] The beneficial effects of this solution are: 1. Decelerate and increase the torque of the driving part through an intermediate gear pair. Through threaded connection with the lead screw, convert the rotational motion into axial movement, thereby squeezing the moving wheel and changing the diameter of the contact between the moving wheel and the fixed wheel and the belt. Furthermore, reliable, efficient, and stepless speed change suitable for large torque is achieved.

[0008] 2. The traditional ECVT transmission includes an actuator, a pulley housing cover, a primary pulley fixed wheel, a primary pulley moving wheel, a secondary pulley fixed wheel, a secondary pulley moving wheel, an output shaft, and a main input shaft 20. Among them, the actuator is used to move the primary pulley moving wheel axially along the output shaft to shift gears. Moreover, the primary pulley fixed wheel is arranged on the side close to the pulley housing cover, that is, the primary pulley fixed wheel is close to the outside of the motorcycle, and the primary pulley moving wheel is close to the inside of the motorcycle. The actuator structures such as the motor and the intermediate shaft gear of the transmission are also installed inside the pulley housing cover of the motorcycle. Therefore, during the assembly of the motorcycle, the structures such as the motor that make up the actuator need to be installed one by one before the pulley housing cover and other structures can be installed, resulting in a low overall assembly efficiency of the motorcycle.

[0009] To solve the above problems, the applicant has developed a technology of installing the actuator outside the pulley housing cover. That is, the pulley housing cover can be installed preferentially without installing the actuator, and the overall assembly of the motorcycle can be completed preferentially. When the motorcycle is assembled, the externally mounted actuator can be buckled on the pulley housing cover to quickly complete the installation of the transmission actuator, effectively improving the assembly efficiency of the motorcycle. Moreover, the assembly of the motorcycle and the assembly of the actuator can be carried out simultaneously. After the motorcycle is assembled, the assembled actuator can be directly connected to the motorcycle, making the installation of the actuator more convenient and improving the assembly efficiency of the motorcycle at the same time.

[0010] At the same time, the actuator being independent of the motorcycle can also improve the heat dissipation efficiency and can be provided with an independent sealing and lubrication system. During the maintenance process of the motorcycle, the actuator and the lubrication system of the actuator can be maintained separately without disassembling the power assembly of the motorcycle, making the maintenance more convenient.

[0011] In this solution, the primary pulley moving wheel is closer to the outside of the motorcycle, that is, the side close to the pulley housing cover. Therefore, when pushing the primary pulley moving wheel to move axially along the output shaft to shift gears, the structure that pushes the primary pulley moving wheel will not be blocked by the primary pulley fixed wheel, enabling the above-mentioned externally mounted technology to be realized.

[0012] Furthermore, the driving gear includes an external gear and an internal gear connected coaxially. The output shaft of the driving part meshes with the internal gear, and the external gear meshes with the intermediate gear.

[0013] Furthermore, the intermediate gear includes a small intermediate gear and a large intermediate gear connected coaxially. The large intermediate gear meshes with the external gear of the driving gear, and the small intermediate gear meshes with the driven gear.

[0014] Furthermore, a first sleeve is coaxially fixed to the primary pulley, the first sleeve is sleeved on the main input shaft, and the first sleeve rotates with the main input shaft; an opening opposite to the first sleeve is provided on the pulley housing cover; the inner screw is sleeved outside the first sleeve, the first sleeve rotates in cooperation with the inner screw, and the inner screw can push the primary pulley in the axial direction.

[0015] Furthermore, a displacement measuring unit is provided laterally of the inner screw rod, and the displacement measuring unit comprises a distance sensor and a signal block, wherein the signal block is provided on the inner screw rod and can move with the inner screw rod, and the distance sensor is located laterally of the output shaft and can detect the moving distance of the signal block; Among them, a slope is provided on the side of the signal block facing the distance sensor, and the distance between one end of the slope close to the end of the main input shaft and the main input shaft is greater or less than the distance between the other end and the main input shaft; in this scheme, the movement distance of the signal block along the axial direction is judged by the cooperation between the distance sensor and the slope: Alternatively, the signal block includes a permanent magnet block, and the distance sensor is a Hall sensor. In this solution, the moving distance of the signal block can be accurately detected through the Hall effect between the Hall sensor and the permanent magnet block on the signal block.

[0016] Furthermore, a shell is provided on the side of the pulley housing cover away from the motorcycle, the displacement measuring unit is located in the shell, a positioning groove is provided on the inner wall of the shell, the positioning groove extends along the axial direction of the main input shaft, and one end of the signal block away from the inner screw is located in the positioning groove and slidably cooperates with the positioning groove.

[0017] Furthermore, a first limiting portion is circumferentially provided between the driven gear and the inner screw rod, and before the inner screw rod is pressed against the driven gear, the first limiting portion and the signal block abut against each other.

[0018] Furthermore, a plurality of arc grooves are circumferentially provided on one side of the driven gear close to the inner screw rod, and the parts between the arc grooves are relatively protruding to form a first limiting portion; a second limiting portion is provided on the side of the signal block close to the driven gear, and a rotation trajectory of the second limiting portion is projected within the range of the arc groove and the first limiting portion, and before the inner screw rod is pressed against the driven gear, the first limiting portion and the second limiting portion are abutted against each other.

[0019] Furthermore, the distance sensor is a travel sensor.

[0020] The present invention also adopts the following technical solution: a motorcycle comprises the aforementioned continuously variable transmission.

[0021] This solution also has the following effects: 1. The internal gear has the advantages of compact structure, smooth transmission, high precision and high overlap. Since it is in direct contact with the output shaft of the driving part, it can be removed and maintained together with the output shaft of the driving part, and no separate maintenance is required.

[0022] 2. To make the overall appearance of the present invention more symmetrical and regular for layout when installed on a motorcycle and maximize space utilization, in this solution, the motor output shaft is made as close as possible to the center of the overall structure to facilitate the connection and fixation of the motor for inputting power and the present invention; thus achieving the effects of compact structure, reasonable layout, and space saving. Compared with arranging them in a row, in this solution, the centers of the driving gear, the intermediate gear, and the driven gear form a triangle, and with the gear radius unchanged, the outer contour area of the total plane is the smallest, saving more space.

[0023] 3. The traditional ECVT transmission includes an actuator, a pulley housing cover, a fixed disk, and a moving disk. The actuator is used to move the moving disk axially to perform stepless shifting. The fixed disk is arranged on one side close to the pulley housing cover, that is, the fixed disk is close to the outside of the motorcycle, and the moving disk is close to the inside of the motorcycle. The actuator structure is also installed inside the pulley housing cover of the motorcycle. Therefore, during the assembly of the motorcycle, the installation of structures such as the motor that make up the actuator needs to be completed one by one before installing structures such as the pulley housing cover, that is, all the above-mentioned parts need to be prepared in place and then installed at one time. The parts in this process are numerous and miscellaneous, resulting in a low overall assembly efficiency of the motorcycle.

[0024] In this solution, first, the driving part, the driving gear, the intermediate gear, and the driven gear of the actuator are integrated on the external housing. The supplier can pre-assemble the actuator and sell it uniformly. The processing factory can first install the transmission on the motorcycle main body, and then directly fix the integrated actuator on the outside of the pulley housing cover of the transmission, and connect the inner lead screw of the actuator and the moving disk of the transmission, thus achieving rapid assembly. Finally, the pulley housing cover and the external housing can be connected through parts such as bolts.

[0025] At the same time, the actuator being independent of the motorcycle can also improve the heat dissipation efficiency and can be provided with an independent sealing and lubrication system. During the maintenance process of the motorcycle, the actuator and its lubrication system can be maintained separately without disassembling the power assembly of the motorcycle, making the maintenance more convenient.

[0026] For the transmission supporting this solution, its moving disk is closer to the outside of the motorcycle, that is, the side close to the pulley housing cover. Therefore, when shifting by moving the moving disk axially along the main input shaft, the structure for moving the moving disk will not be blocked by the fixed disk, enabling the above-mentioned external technology to be realized.

[0027] 4. Since the inclined surface of the signal block is inclined, there is a difference in the distance between one end of the inclined surface close to the end of the main input shaft and the other end and the distance sensor. During gear shifting, the signal block moves axially synchronously. At this time, the inclined surface moves accordingly, the relative position between the inclined surface and the distance sensor changes, and the detected distance of the distance sensor changes. Therefore, in this solution, only one distance sensor needs to be set to accurately measure the displacement. Compared with the current method that requires the cooperation of an angle sensor and a stroke sensor to achieve displacement measurement, the structure of this solution is simpler and the weight of the measuring mechanism is smaller.

[0028] In this solution, the distance sensor is a Hall type stroke sensor, which can collect the magnetic field change signal of the stroke displacement, so as to more quickly and accurately determine the position of the inclined surface, thereby improving the measurement efficiency and accuracy.

[0029] 5. After the externally mounted actuator is installed, the structure that pushes the moving pulley of the primary belt pulley to slide axially needs to be connected to the moving pulley of the primary belt pulley. The opening in this solution provides space for the connection of the two.

[0030] 6. The stroke sensor can collect the magnetic field change signal of the stroke displacement, so as to more quickly and accurately determine the position of the inclined surface, thereby improving the measurement efficiency and accuracy.

[0031] 7. During the gear shifting process, since the signal block is eccentrically arranged on the inner lead screw, the inner lead screw can be guided through the cooperation between the positioning groove and the signal block, thereby preventing the inner lead screw from rotating. While simplifying the structure, it ensures that the inner lead screw can be adjusted axially, pushes the moving pulley of the primary belt pulley axially, and thus completes stepless speed change. Description of the Drawings

[0032] Figure 1 It is the top view of Embodiment 1; Figure 2 It is Figure 1 the A-A sectional view of Figure 3 It is Figure 1 the B-B sectional view of Figure 4 It is the top view of Embodiment 1 installed on the transmission; Figure 5 It is Figure 4 the A-A sectional view of Detailed Description of the Specific Embodiment

[0033] The following is further detailed through specific embodiments: The reference numerals in the attached drawings of the description include: external housing 1, external housing cover 11, pulley housing cover 2, main input shaft 20, primary pulley fixed wheel 21, primary pulley moving wheel 22, first sleeve 23, main output shaft 24, secondary pulley moving wheel 25, secondary pulley fixed wheel 26, limiting ring 27, pre-tightening spring 28, motor 3, driving shaft 41, external gear 42, internal gear 43, intermediate shaft 51, small intermediate gear 52, large intermediate gear 53, driven gear 6, driven shaft 61, threaded portion 62, internal lead screw 7, distance sensor 81, signal block 82.

[0034] Embodiment 1 Embodiment 1 is basically as Figures 1-5 shown: a continuously variable transmission, including a speed-changing mechanism and an external execution mechanism. The speed-changing mechanism includes a pulley housing cover 2. On the side of the pulley housing cover 2 close to the motorcycle body, there are an output assembly, a transmission member, and an input assembly. The transmission member is used to transmit the power between the output assembly and the input assembly. The transmission member is a belt or a chain. In this embodiment, the transmission member is a belt.

[0035] The output assembly includes a main output shaft 24, a secondary pulley fixed wheel 26, and a secondary pulley moving wheel 25. The secondary pulley fixed wheel 26 is coaxially fixed with a sleeve-shaped extension portion. The main output shaft 24 axially penetrates the secondary pulley fixed wheel 26 and is used to drive the secondary pulley fixed wheel 26 to rotate synchronously. The secondary pulley moving wheel 25 is located below the secondary pulley fixed wheel 26 and sleeved on the extension portion. There is a small clearance transition fit between the secondary pulley moving wheel 25 and the extension portion, so that the secondary pulley moving wheel 25 can slide axially relative to the secondary pulley fixed wheel 26. A limiting ring 27 is integrally formed at the lower end of the extension portion. A pre-tightening spring 28 is sleeved on the extension portion, and the two ends of the pre-tightening spring 28 are respectively abutted against the secondary pulley moving wheel 25 and the limiting ring 27.

[0036] The input component is arranged on the left side of the output component. The input component includes a primary belt pulley fixed wheel 21, a primary belt pulley movable wheel 22, and a main input shaft 20. The main input shaft 20 is parallel to the main output shaft 24. The primary belt pulley fixed wheel 21 is sleeved on the lower end of the main input shaft 20 and is spline-connected to the main input shaft 20. The primary belt pulley movable wheel 22 is coaxially fixed with a first sleeve 23. The first sleeve 23 is sleeved on the main input shaft 20 and is in a small clearance transition fit with the main input shaft 20, so that the primary belt pulley movable wheel 22 can slide axially along the main input shaft 20. In this embodiment, the primary belt pulley movable wheel 22 is located above the primary belt pulley fixed wheel 21, that is, the primary belt pulley fixed wheel 21 is close to the inside of the motorcycle, and the primary belt pulley movable wheel 22 is close to the outside of the motorcycle. An opening is provided on the belt pulley housing cover 2 of the motorcycle. The upper ends of the first sleeve 23 and the main input shaft 20 both extend from the buckle to the outside of the belt pulley housing cover 2. The belt is tensioned between the output component and the input component. Specifically, the left end of the belt is tensioned between the primary belt pulley movable wheel 22 and the primary belt pulley fixed wheel 21; the right end of the belt is tensioned between the secondary belt pulley movable wheel 25 and the secondary belt pulley fixed wheel 26.

[0037] The external execution mechanism includes an external housing 1. The external housing 1 is bolted to the side of the belt pulley housing cover 2 away from the motorcycle body. The primary belt pulley movable wheel 22 of the gearbox is arranged on the side away from the motorcycle body. A driving member and a transmission mechanism are provided in the external housing 1. The driving member is a motor 3, and the driving member is bolted to the motorcycle body; The external housing 1 is installed on the outer surface of the gearbox, and the corresponding primary belt pulley movable wheel 22 of the gearbox is arranged on the side away from the motorcycle body.

[0038] It further includes an external housing cover 11. The external housing 1 and the external housing cover 11 cooperate to protect the transmission mechanism therein, such as Figure 3 as shown. The lower side is the side close to the motorcycle body. The driving member is bolted inside the external housing 1. The transmission mechanism includes a driving shaft 41, an intermediate shaft 51, and a driven shaft 61. The upper end of the driving shaft 41 is assembled and rotationally connected to the external housing cover 11 using a shoulder bushing, and the lower end is assembled and rotationally connected to the external housing 1 using a bearing. An external gear 42 and an internal gear 43 are integrally formed coaxially on the driving shaft 41. The driving shaft 41, the external gear 42, and the internal gear 43 form a driving gear. The output shaft of the driving member is eccentrically arranged relative to the internal gear 43; the driving shaft 41 passes through the external gear 42 and is rotationally connected to the external gear 42.

[0039] The upper and lower ends of the intermediate shaft 51 are respectively rotatably connected to the outer housing cover 11 and the outer housing 1. The specific connection method is as follows: The two ends of the intermediate shaft 51 are directly in small clearance fit with the corresponding holes of the outer housing cover 11 and the outer housing 1, or bushings and bearings are added to the ends of the intermediate shaft 51 or the corresponding holes for assembly. A small intermediate gear 52 and a large intermediate gear 53 are integrally formed coaxially on the intermediate shaft 51. The intermediate shaft 51, the small intermediate gear 52, and the large intermediate gear 53 form an intermediate gear. The small intermediate gear 52 is arranged below the large intermediate gear 53, and the large intermediate gear 53 meshes with the outer gear 42.

[0040] The upper and lower ends of the driven shaft 61 are respectively rotatably connected to the outer housing cover 11 and the outer housing 1, and the connection method is the same as that of the intermediate shaft 51; A driven gear 6 is integrally formed on the driven shaft 61. A ball bearing is provided between the outer housing cover 11 and the driven shaft 61. The driven gear 6 meshes with the small intermediate gear 52. A threaded portion 62 is provided on the lower surface of the driven gear 6. An internal lead screw 7 is sleeved and threadedly connected to the threaded portion 62. The internal lead screw 7 is a tubular object with internal threads. The internal lead screw 7 is in clearance fit with the primary pulley moving wheel 22, and the internal lead screw 7 is used to push the primary pulley moving wheel 22 to move axially.

[0041] As Figure 5 shown, a displacement measuring unit is provided in one of the directions outside the internal lead screw 7. The displacement measuring unit includes a distance sensor 81 and a signal block 82. The signal block 82 is integrally formed on the outside of the internal lead screw 7. The distance sensor 81 is bolted to the inside of the outer housing 1. A slope is provided on the side of the signal block 82 facing the distance sensor 81. The distance between the slope and the output shaft at one end close to the output shaft end is greater than or less than the distance at the other end. The distance sensor 81 is a travel sensor, which can collect the magnetic field change signal of the travel displacement, so as to more quickly and accurately determine the position of the slope.

[0042] An inner channel (not shown in the figure) is formed by inward convexity inside the housing 1. The signal block 82 is slidably arranged in the inner channel, and the inner channel is used to limit the rotation of the limiting block and the lead screw 7.

[0043] Embodiment 2 Based on Embodiment 1, in Embodiment 2: Three first limiting parts are welded circumferentially and equiangularly on the side of the driven gear 6 close to the internal lead screw 7. The first limiting parts are pins. When the internal lead screw 7 rotates and approaches the driven gear 6 to the limit position, the signal block 82 on the internal lead screw 7 abuts against one of the pins, thereby preventing the internal lead screw 7 from directly hitting the driven gear 6, and thus avoiding damage to the ball bearing between the outer housing cover 11 and the driven shaft 61.

[0044] Embodiment 3 Based on Embodiment 1, in Embodiment 3: As an improved scheme of Embodiment 2, since the thickness of the driven gear 6 is usually not too thick, if the pins are directly welded on the driven gear 6, it is easy to affect the mechanical properties of the driven gear 6.

[0045] Therefore, in this solution, three arc-shaped grooves are circumferentially provided on the side of the driven gear 6 close to the inner lead screw 7, and the parts between the arc-shaped grooves protrude relatively to form a first limiting portion; a second limiting portion is provided on the side of the signal block 82 close to the driven gear 6, and the rotation trajectory projection of the second limiting portion is within the range of the arc-shaped grooves and the first limiting portion. When the inner lead screw 7 rotates and approaches the driven gear 6 to the limit position, the second limiting portion first turns into the arc-shaped groove, and then the second limiting portion continues to rotate until it abuts against the first limiting portion. Embodiment 4 The difference between Embodiment 4 and Embodiment 1 is that the signal block 2 in this Embodiment 1 is strip-shaped and extends along the axial direction of the inner lead screw 1. The signal block 2 includes a permanent magnet block. Specifically, the permanent magnet block in this embodiment is a magnet, and the signal block 2 is formed by plastic coating on the outside of the magnet and is installed on the inner lead screw 1 through bolts. At the same time, the distance sensor in this embodiment uses a Hall sensor, and the detection end of the Hall sensor is located at the rear side of the signal block 2 and is opposite to the signal block 2. Compared with Embodiment 1, the Hall sensor in this embodiment uses the Hall effect to detect the moving distance of the signal block 2.

[0046] The above are only the embodiments of the present invention, and common general technical solutions and / or characteristics in the solutions are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be subject to the content of its claims, and the specific implementation manners in the specification can be used to interpret the content of the claims.

Claims

1. A continuously variable transmission, characterized in that: It includes a speed change mechanism and an externally mounted actuator. The speed change mechanism includes a pulley housing cover, on which an output assembly, a transmission member, and an input assembly are provided. The transmission member is used to transmit power between the output assembly and the input assembly. The input assembly includes a primary pulley fixed wheel, a primary pulley movable wheel, and a main input shaft. Both the primary pulley fixed wheel and the primary pulley movable wheel are provided on the main input shaft, and the primary pulley movable wheel is arranged on the side away from the motorcycle body. The externally mounted actuator includes an externally mounted housing, which is arranged on the side of the pulley housing cover away from the motorcycle body. A limiting portion, a driving member, and a driving gear, an intermediate gear, and a driven gear that are sequentially engaged are provided inside the externally mounted housing. A threaded portion is provided on the driven gear, and an internal lead screw is threadedly connected to the threaded portion. The driving member drives the internal lead screw to axially move, thereby driving the primary pulley movable wheel to axially move.

2. The continuously variable transmission and motorcycle according to claim 1, characterized in that: The driving gear includes an external gear and an internal gear that are coaxially connected. The output shaft of the driving member meshes with the internal gear, and the external gear meshes with the intermediate gear.

3. The motorcycle ECVT transmission structure according to claim 2, wherein: The intermediate gear includes a small intermediate gear and a large intermediate gear that are coaxially connected. The large intermediate gear meshes with the external gear of the driving gear, and the small intermediate gear meshes with the driven gear.

4. The motorcycle ECVT transmission structure according to claim 1, characterized in that: The primary pulley movable wheel is coaxially fixed with a first sleeve, and the first sleeve is sleeved on the main input shaft. The first sleeve rotates with the main input shaft. An opening opposite to the first sleeve is provided on the pulley housing cover. The internal lead screw is sleeved outside the first sleeve. The first sleeve is rotationally matched with the internal lead screw, and the internal lead screw can axially push the primary pulley movable wheel.

5. The motorcycle ECVT transmission structure according to claim 4, characterized in that: A displacement measuring unit is provided laterally on the internal lead screw. The displacement measuring unit includes a distance sensor and a signal block. The signal block is provided on the internal lead screw and can move with the internal lead screw. The distance sensor is located laterally of the output shaft and can detect the moving distance of the signal block. Wherein, a slope is provided on the side of the signal block facing the distance sensor. The distance between one end of the slope close to the end of the main input shaft and the main input shaft is greater than or less than the distance between the other end and the main input shaft. Alternatively, the signal block includes a permanent magnet block, and the distance sensor is a Hall sensor.

6. The motorcycle ECVT transmission structure according to claim 5, characterized in that: A housing is provided on the side of the pulley housing cover away from the motorcycle. The displacement measuring unit is located inside the housing. A positioning groove is provided on the inner wall of the housing. The positioning groove extends along the axial direction of the main input shaft. One end of the signal block away from the internal lead screw is located in the positioning groove and is slidably matched with the positioning groove.

7. The stepless transmission and motorcycle according to claim 5, characterized in that: The distance sensor is a travel sensor.

8. The continuously variable transmission and motorcycle according to claim 5, characterized in that: A first limiting portion is provided circumferentially between the driven gear and the internal lead screw. Before the internal lead screw abuts against the driven gear, the first limiting portion abuts against the signal block.

9. The continuously variable transmission and motorcycle according to claim 8, characterized in that: A plurality of arc-shaped grooves are provided circumferentially on the side of the driven gear close to the internal lead screw. The portions between the arc-shaped grooves are relatively convex to form a first limiting portion. A second limiting portion is provided on the side of the signal block close to the driven gear. The projection of the rotation trajectory of the second limiting portion is within the range of the arc-shaped grooves and the first limiting portion. Before the internal lead screw abuts against the driven gear, the first limiting portion abuts against the second limiting portion.

10. Motorcycle, characterized in that: It includes the continuously variable transmission according to any one of claims 1-8.

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