ECVT speed change structure of motorcycle

Abstract

The invention relates to the field of motorcycle transmissions, and particularly discloses an ECVT speed change structure of a motorcycle. Comprising an input assembly, an output assembly and a traction belt, the output assembly comprises a primary belt pulley fixed wheel, a primary belt pulley movable wheel and an output shaft, and the input assembly comprises an input shaft, a secondary belt pulley fixed wheel and a secondary belt pulley movable wheel; the primary belt pulley fixed wheel and the secondary belt pulley movable wheel are both located on the side close to the interior of the motorcycle, and the primary belt pulley movable wheel and the secondary belt pulley fixed wheel are both located on the side, facing the exterior of the motorcycle, of the primary belt pulley fixed wheel. The traction belt is tensioned between the input assembly and the output assembly, one end of the traction belt is located between the primary belt pulley fixed wheel and the primary belt pulley movable wheel, and the other end of the traction belt is located between the secondary belt pulley fixed wheel and the secondary belt pulley movable wheel. According to the ECVT speed change structure of the motorcycle, the problem that the assembling efficiency of the motorcycle is low is solved.

Description

Technical Field

[0001] The present invention relates to the field of motorcycle transmissions, and particularly to a motorcycle ECVT transmission structure. Background Art

[0002] Currently, motorcycles mainly use centrifugal variators with flyweights. When a centrifugal variator with flyweights is working, the flyweights are affected by the engine speed. When the speed gradually increases, the flyweights are subjected to an outward force that overcomes the large spring, and they move radially along the chute towards the outer edge of the disk, increasing the force that presses the axially moving movable disk, increasing the working radius, decreasing the diameter of the driven disk, changing the transmission ratio, and thus achieving stepless speed change.

[0003] Since the centrifugal variator with flyweights mainly relies on frictional transmission between the belt and the pulley during operation, the transmission efficiency is low, the fuel consumption is high, the pulley is easily worn and needs to be replaced regularly, resulting in high maintenance costs and low reliability of the transmission; the low transmission efficiency also makes the transmission mainly applicable to small-displacement models and not suitable for high-performance motorcycles with large torque output.

[0004] To solve the above problems, a multi-scheme, modular, constant-power stepless speed regulation mechanism as disclosed in the patent number CN204153070U appeared later. This stepless speed regulation mechanism achieves stepless speed change by reducing or increasing the distance between the movable and fixed pulleys of the split pulley: during machine operation, the pulley rotates, the bearing housing contains bearings, the outer ring of the bearing is fixed to the bearing housing, and the inner ring of the bearing is fixed to the pulley. When the belt rotates, it only drives the inner ring of the bearing to rotate, while the outer ring of the bearing and the bearing housing remain stationary. In this way, the bearing housing can be used for stepless speed regulation control. During use, the speed regulation component directly or indirectly controls the up and down movement of the bearing housing, drives the movable pulley of the split pulley pair to move up and down, changes the distance between the movable and stationary pulleys of the pulley pair, and thus changes the transmission speed ratio of the two ends of the pulley pair, achieving the purpose of stepless mechanical speed regulation.

[0005] Currently, in actual application, the movable and stationary pulleys of the pulley pair of the transmission, as well as the actuators such as the motor and the intermediate shaft gear, are installed inside the motorcycle. Therefore, when assembling the motorcycle, it is necessary to complete the installation of the structures such as the motor that make up the actuator one by one before installing the pulley housing cover and other structures of the motorcycle, resulting in low overall vehicle assembly efficiency of the motorcycle. Summary of the Invention

[0006] The present invention aims to provide a motorcycle ECVT transmission structure to solve the problem of low assembly efficiency of motorcycles.

[0007] To achieve the above object, the present invention adopts the following technical solution: a motorcycle ECVT transmission structure, comprising an input assembly, an output assembly and a traction belt. The output assembly includes a primary pulley fixed wheel, a primary pulley movable wheel and an output shaft. The input assembly includes an input shaft, a secondary pulley fixed wheel and a secondary pulley movable wheel. The primary pulley fixed wheel and the primary pulley movable wheel are both arranged on the output shaft, and the primary pulley movable wheel can move axially along the output shaft. The secondary pulley fixed wheel and the secondary pulley movable wheel are both arranged on the input shaft. The primary pulley fixed wheel and the secondary pulley movable wheel are both located on the side close to the interior of the motorcycle, and the primary pulley movable wheel and the secondary pulley fixed wheel are both located on the side of the primary pulley fixed wheel facing the outside of the motorcycle. The traction belt is tensioned between the input assembly and the output assembly, and one end of the traction belt is located between the primary pulley fixed wheel and the primary pulley movable wheel, and the other end is located between the secondary pulley fixed wheel and the secondary pulley movable wheel.

[0008] The beneficial effects of this solution are as follows: The traditional ECVT transmission includes an actuator, a pulley housing cover, a primary pulley fixed wheel, a primary pulley movable wheel, a secondary pulley fixed wheel, a secondary pulley movable wheel, an output shaft and an input shaft. Among them, the actuator is used to move the primary pulley movable 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 movable 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, when assembling 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 first without installing the actuator, and the overall assembly of the motorcycle can be completed first. When the motorcycle is assembled, the external 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 its lubrication system can be maintained separately without disassembling the power assembly of the motorcycle, making the maintenance more convenient.

[0011] In this solution, the driving pulley of the primary pulley is closer to the outside of the motorcycle, that is, the side closer to the pulley housing cover. Therefore, when shifting gears by pushing the driving pulley of the primary pulley to move axially along the output shaft, the structure for pushing the driving pulley of the primary pulley to move will not be blocked by the fixed pulley of the primary pulley, enabling the realization of the above-mentioned external hanging technology.

[0012] Furthermore, a first sleeve is coaxially fixed to the driving pulley of the primary pulley. The first sleeve is sleeved on the output shaft and can rotate with the output shaft and slide axially along the output shaft. An opening opposite to the first sleeve is provided on the pulley housing cover.

[0013] The beneficial effect of this solution is that after the externally hung actuator is installed, a structure for pushing the driving pulley of the primary pulley to slide axially needs to be connected to the driving pulley of the primary pulley. The opening in this solution provides space for the connection between the two.

[0014] Furthermore, an internal lead screw is sleeved on the outside of the first sleeve. The first sleeve is rotationally matched with the internal lead screw, and the internal lead screw can push the driving pulley of the primary pulley axially.

[0015] The beneficial effect of this solution is that the externally hung actuator can quickly push the driving pulley of the primary pulley to move through the internal lead screw, and the operation is simple.

[0016] Furthermore, a displacement measurement unit is provided on the side of the internal lead screw. The displacement measurement unit includes a distance sensor and a signal block. The signal block is arranged on the internal lead screw and can move with the internal lead screw. The distance sensor is located on the side of the output shaft and can detect the moving distance of the signal block.

[0017] The beneficial effect of this solution is that the distance sensor in this solution can directly measure the moving distance of the signal block. Therefore, only one sensor needs to be set in this solution 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 measurement mechanism is smaller.

[0018] Furthermore, 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 output shaft and the output shaft is greater than or less than the distance between the other end far from the end of the output shaft and the output shaft.

[0019] The beneficial effect of this solution is that due to the inclined setting of the slope, there is a difference in the distance between one end of the slope close to the end of the output shaft and the sensor and the other end far from the end of the output shaft and the sensor. When shifting gears, the signal block moves axially synchronously. At this time, the slope moves accordingly, the relative position between the slope and the sensor changes, and the detected distance by the sensor changes. Therefore, only one sensor needs to be set in this solution 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 measurement mechanism is smaller.

[0020] Further, the distance sensor is a stroke sensor.

[0021] The beneficial effect of this solution is that the stroke sensor can collect the magnetic field change signal of the stroke displacement, so as to determine the position of the inclined plane more quickly and accurately, thereby improving the measurement efficiency and accuracy.

[0022] Further, a housing is provided on the side of the pulley housing cover away from the motorcycle, the displacement measurement 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 output shaft, and one end of the signal block away from the inner lead screw is located in the positioning groove and is in sliding fit with the positioning groove.

[0023] The beneficial effect of this solution is that 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, pushing the moving pulley of the primary pulley axially to complete the gear shift.

[0024] Further, a second sleeve is coaxially provided inside the inner lead screw, the inner lead screw is in threaded cooperation with the second sleeve, and the second sleeve is coaxially fixed with the output shaft gear.

[0025] The beneficial effect of this solution is that the rotation of the output shaft gear can drive the second sleeve to rotate synchronously. At this time, under the cooperation between the positioning groove and the signal block, the inner lead screw can move axially quickly, and the gear shifting operation is simple.

[0026] Further, the signal block includes a permanent magnet block, and the distance sensor is a Hall sensor.

[0027] The beneficial effect of this solution is that 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. Description of the Drawings

[0028] Figure 1 It is a front vertical sectional view of Embodiment 1 of the present invention. Detailed Description of the Invention

[0029] The following is further detailed through specific embodiments: The reference numerals in the drawings of the specification include: pulley housing cover 1, output shaft 2, fixed pulley 21 of the primary pulley, moving pulley 22 of the primary pulley, first sleeve 23, bearing 24, second sleeve 3, inner lead screw 4, signal block 41, inclined plane 42, mounting seat 5, stroke sensor 51, input shaft 6, moving pulley 61 of the secondary pulley, fixed pulley 62 of the secondary pulley, limit ring 63, pre-tightening spring 64.

[0030] Embodiment 1 Embodiment 1 is basically as follows Figure 1 shown. The motorcycle ECVT transmission structure includes an input component, an output component, a traction belt, and a displacement measurement unit. In this embodiment, both the input component and the output component are disposed within the pulley housing cover 1 of the motorcycle. The input component includes an input shaft 6, a secondary pulley fixed wheel 62, and a secondary pulley movable wheel 61. The secondary pulley fixed wheel 62 is coaxially fixed with a sleeve-shaped extension portion. The input shaft 6 axially penetrates through the secondary pulley fixed wheel 62 and is used to drive the secondary pulley fixed wheel 62 to rotate synchronously. The secondary pulley movable wheel 61 is located below the secondary pulley fixed wheel 62 and sleeved on the extension portion. There is a small clearance transition fit between the secondary pulley movable wheel 61 and the extension portion, such that the secondary pulley movable wheel 61 can slide axially relative to the secondary pulley fixed wheel 62. A limiting ring 63 is integrally formed at the lower end of the extension portion. A pre-tightening spring 64 is sleeved on the extension portion, and both ends of the pre-tightening spring 64 abut against the secondary pulley movable wheel 61 and the limiting ring 63 respectively.

[0031] The output component is disposed on the left side of the input component. The output component includes a primary pulley fixed wheel 21, a primary pulley movable wheel 22, and an output shaft 2. The output shaft 2 is parallel to the input shaft 6. The primary pulley fixed wheel 21 is sleeved on the lower end of the output shaft 2 and is spline-connected to the output shaft 2; the primary pulley movable wheel 22 is coaxially fixed with a first sleeve 23. The first sleeve 23 is sleeved on the output shaft 2 and has a small clearance transition fit with the output shaft 2, such that the primary pulley movable wheel 22 can slide axially along the output shaft 2. In this embodiment, the primary pulley movable wheel 22 is located above the primary pulley fixed wheel 21, that is, the primary pulley fixed wheel 21 is close to the interior of the motorcycle, and the primary pulley movable wheel 22 is close to the outside of the motorcycle. There is an opening on the pulley housing cover 1 of the motorcycle. The upper ends of both the first sleeve 23 and the output shaft 2 extend from the buckle to the outside of the pulley housing cover 1. In this embodiment, the traction belt uses a belt, and the traction belt is tensioned between the input component and the output component. Specifically, the left end of the traction belt is tensioned between the primary pulley movable wheel 22 and the primary pulley fixed wheel 21; the right end of the traction belt is tensioned between the secondary pulley movable wheel 61 and the secondary pulley fixed wheel 62.

[0032] A second sleeve 3 is sleeved on the upper end of the first sleeve 23. The second sleeve 3 has a clearance fit with the first sleeve 23. The upper end of the second sleeve 3 is integrally formed with the output shaft gear of the transmission. An inner lead screw 4 is sleeved outside the second sleeve 3. The inner lead screw 4 is in threaded fit with the second sleeve 3. A bearing 24 is installed between the inner lead screw 4 and the first sleeve 23, and there is an oil seal between the lower end of the inner lead screw 4 and the first sleeve 23.

[0033] The displacement measurement unit includes a distance sensor, a mounting seat 5, and a signal block 41. The signal block 41 is located on the left side wall of the inner lead screw 4 and is integrally formed with the inner lead screw 4. The cross-section of the signal block 41 is fan-shaped. In actual implementation, a housing is provided on the outer side wall of the pulley housing cover 1, and this housing also serves as the actuator housing. A positioning groove is provided on the inner wall of the housing, and the positioning groove extends vertically. The signal block 41 is located in the positioning groove and is slidably engaged with the positioning groove. The cooperation between the positioning groove and the signal block 41 can limit the inner lead screw 4, so that when the output shaft 2 gear rotates, the inner lead screw 4 can slide along the axial direction of the output shaft 2, thereby driving the primary pulley moving wheel 22 to move axially.

[0034] The distance sensor in this embodiment uses a stroke sensor 51. The stroke sensor 51 is installed on the mounting seat 5 and is provided on the left side of the signal block 41. Specifically, the mounting seat 5 in this solution is installed on the housing by bolts. The side of the signal block 41 facing away from the inner lead screw 4 is an inclined surface 42 and is opposite to the stroke sensor 51. Specifically, the inclined surface 42 in this embodiment is inclined with the upper end to the left and the lower end to the right, so that from top to bottom, the distance between the part of the inclined surface 42 opposite to the stroke sensor 51 and the stroke sensor 51 gradually increases.

[0035] The specific implementation process is as follows: When the speed change structure in this solution is used, the second sleeve 3, the inner lead screw 4, and the displacement measurement unit are all arranged in an externally mounted actuator. During installation, the inner lead screw 4 can be connected to the first sleeve 23 without being blocked by the primary pulley fixed wheel 21. When a gear shift is required, the second sleeve 3 rotates with the output shaft gear, causing the inner lead screw 4 to move along the axial direction of the second sleeve 3, driving the primary pulley moving wheel 22 to move synchronously. At this time, the signal block 41 also moves synchronously, and the part of the inclined surface 42 opposite to the stroke sensor 51 changes, causing the distance detected by the stroke sensor 51 to change. At this time, according to the change amount and the slope of the inclined surface 42, the distance that the inner lead screw 4 slides along the axial direction can be quickly calculated, and this distance is the distance that the primary pulley moving wheel 22 moves along the axial direction, thereby determining the gear shift amount.

[0036] Embodiment 2 Based on Embodiment 1, the difference from Embodiment 1 is that the signal block 41 in this embodiment is strip-shaped and extends along the axial direction of the inner lead screw 4. The signal block 41 includes a permanent magnet block. Specifically, the permanent magnet block in this embodiment is a magnet, and the signal block 41 is formed by plastic coating outside the magnet. The signal block 41 is installed on the inner lead screw 4 by 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 41 and is opposite to the signal block 41. Compared with Embodiment 1, the Hall sensor in this embodiment uses the Hall effect to detect the moving distance of the signal block 41.

[0037] The above are only embodiments of the present invention, and common general technical solutions and / or characteristics in the solutions are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solutions of the present invention, several modifications and improvements can be made, which 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 practicability of the patent. The protection scope required by this application shall be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. Motorcycle ECVT transmission structure, characterized in that: It includes an input component, an output component and a traction belt. The output component includes a primary belt pulley fixed wheel, a primary belt pulley moving wheel and an output shaft. The input component includes an input shaft, a secondary belt pulley fixed wheel and a secondary belt pulley moving wheel. The primary belt pulley fixed wheel and the primary belt pulley moving wheel are both arranged on the output shaft, and the primary belt pulley moving wheel can move axially along the output shaft. The secondary belt pulley fixed wheel and the secondary belt pulley moving wheel are both arranged on the input shaft. The primary belt pulley fixed wheel and the secondary belt pulley moving wheel are both located on the side close to the inside of the motorcycle, and the primary belt pulley moving wheel and the secondary belt pulley fixed wheel are both located on the side of the primary belt pulley fixed wheel facing away from the motorcycle. The traction belt is tensioned between the input component and the output component, and one end of the traction belt is located between the primary belt pulley fixed wheel and the primary belt pulley moving wheel, and the other end is located between the secondary belt pulley fixed wheel and the secondary belt pulley moving wheel.

2. The motorcycle ECVT transmission structure according to claim 1, wherein: The primary belt pulley moving wheel is coaxially fixed with a first sleeve, and the first sleeve is sleeved on the output shaft. The first sleeve rotates with the output shaft and can slide axially along the output shaft. An opening opposite to the first sleeve is provided on the pulley housing cover.

3. The motorcycle ECVT transmission structure according to claim 2, characterized in that: An inner lead screw is sleeved outside the first sleeve. The first sleeve is rotationally matched with the inner lead screw, and the inner lead screw can push the primary belt pulley moving wheel axially.

4. The motorcycle ECVT transmission structure according to claim 3, wherein: A displacement measuring unit is provided laterally on the inner lead screw. The displacement measuring unit includes a distance sensor and a signal block. The signal block is arranged on the inner lead screw and can move with the inner lead screw. The distance sensor is located laterally of the output shaft and can detect the moving distance of the signal block.

5. The motorcycle ECVT transmission structure according to claim 4, characterized in that: A slope is provided on the side of the signal block facing the distance sensor. The distance between the end of the slope close to the end of the output shaft and the output shaft is greater than or less than the distance between the end away from the end of the output shaft and the output shaft.

6. The motorcycle ECVT transmission structure according to claim 4, wherein: The distance sensor is a travel sensor.

7. The motorcycle ECVT transmission structure according to claim 4, 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 axially along the output shaft. The end of the signal block away from the inner lead screw is located in the positioning groove and is slidably matched with the positioning groove.

8. The motorcycle ECVT transmission structure according to claim 3, wherein: A second sleeve is coaxially provided inside the inner lead screw. The inner lead screw is threadedly matched with the second sleeve, and the second sleeve is coaxially fixed with the output shaft gear.

9. The motorcycle ECVT transmission structure according to claim 4, wherein: The signal block includes a permanent magnet block, and the distance sensor is a Hall sensor.

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