ECVT executing mechanism of motorcycle

Abstract

The invention relates to the field of motorcycle transmissions, and discloses a motorcycle ECVT executing mechanism which comprises a driving part and a transmission mechanism, the transmission mechanism comprises a driving gear, an intermediate gear and a driven gear which are sequentially meshed, a threaded part is arranged on the driven gear and is in threaded connection with a lead screw, and the driving part drives the lead screw to push a movable disc to move axially. And the belt driving disc generates axial displacement by inertia instead of a pulley ball, so that the contact diameter of the belt is changed, and reliable, efficient and large-torque stepless speed change is realized.

Description

Technical Field

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

[0002] The motorcycle CVT is mainly a variator with centrifugal weights. When the motorcycle CVT with centrifugal weights works, the centrifugal weights are affected by the engine speed. When the speed gradually increases, the centrifugal weights overcome the outward force of the large spring and radially move along the chute towards the outer edge of the disk, increasing the force squeezing the moving disk moving axially, increasing the working radius, reducing the diameter of the moving disk, changing the transmission ratio, and thus achieving stepless speed change.

[0003] Defects of this technology: 1. Low transmission efficiency: Since the variator with centrifugal weights system relies on the frictional 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. 3. Limited application range: Due to the relatively low transmission efficiency, the variator with centrifugal weights system is usually used for small-displacement models and is not suitable for high-performance motorcycles with large torque output. Summary of the Invention

[0004] The present invention aims to provide a motorcycle ECVT actuator to replace the centrifugal weights, which rely on inertia to cause the axial displacement of the belt-driven pulley disk, changing the contact diameter of the belt, so as to achieve reliable, efficient, and stepless speed change suitable for large torque.

[0005] To achieve the above object, the present invention adopts the following technical solution: The motorcycle ECVT actuator includes a driving member and a transmission mechanism. The transmission mechanism includes a driving gear, an intermediate gear, and a driven gear that are sequentially engaged. A threaded portion is provided on the driven gear, and a lead screw is threadedly connected to the threaded portion. The driving member drives the lead screw to push the moving disk axially.

[0006] The beneficial effects of this solution are as follows: The driving member is decelerated and torque-increased through the intermediate gear, and through the threaded connection with the lead screw, the rotational motion is converted into axial movement, thereby squeezing the moving disk and changing the diameter of the moving disk. Furthermore, it replaces the centrifugal weights that rely on inertia to cause the axial displacement of the belt-driven pulley disk, changing the contact diameter of the belt, and achieving reliable, efficient, and stepless speed change suitable for large torque. In this solution, the number of intermediate gears is one or more. Further, the driving gear includes an outer gear and an inner gear coaxially connected. The output shaft of the driving member meshes with the inner gear, and the outer gear meshes with the intermediate gear.

[0007] Further, the intermediate gear includes a small intermediate gear and a large intermediate gear coaxially connected. The large intermediate gear meshes with the outer gear of the driving gear, and the small intermediate gear meshes with the driven gear.

[0008] Further, the lead screw is a tubular object with threads on the inner side. One end of the lead screw is used for detachably connecting to the moving disk in the gearbox, and the other end of the lead screw is sleeved outside the driving gear and threadedly connected to the driving gear.

[0009] Further, a displacement measurement unit is provided laterally on the lead screw. The displacement measurement unit includes a distance sensor and a signal block. The signal block is arranged on the lead screw and can move along with the lead screw. The distance sensor is located laterally of the output shaft and can detect the moving distance of the signal block. Wherein, one side of the signal block facing the distance sensor is provided with an inclined surface. The distance between one end of the inclined surface 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. In this solution, the moving distance of the signal block along the axial direction is judged by the cooperation of the distance sensor and the inclined surface. 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 under the Hall effect between the Hall sensor and the permanent magnet block on the signal block.

[0010] Further, the limiting hole includes a positioning notch for accommodating the signal block. The signal block and the positioning notch cooperate to limit the rotation of the lead screw.

[0011] Further, it includes a housing. The housing is arranged between the gearbox and the motorcycle main body, and the moving disk of the gearbox is arranged on the side close to the motorcycle main body.

[0012] Further, it includes a housing. The housing is installed on the outer surface of the gearbox, and the moving disk of the gearbox is arranged on the side away from the motorcycle main body.

[0013] Further, a first limiting portion is circumferentially arranged between the driven gear and the lead screw. Before the lead screw abuts against the driven gear, the first limiting portion abuts against the signal block.

[0014] Further, several arc-shaped grooves are circumferentially arranged on the side of the driven gear close to the lead screw. The parts between the arc-shaped grooves are relatively convex to form a first limiting portion. A second limiting portion is arranged on the side of the signal block close to the driven gear. The projection of the rotation track of the second limiting portion is within the range of the arc-shaped grooves and the first limiting portion. Before the lead screw abuts against the driven gear, the first limiting portion abuts against the second limiting portion.

[0015] This solution also has the following effects: 1. The internal gear has the advantages of compact structure, stable transmission, high precision, and high contact ratio. 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 without separate maintenance.

[0016] 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 power-input motor and the present invention; thus, the effects of compact structure, reasonable layout, and space saving are achieved. Compared with arranging them in a row, in this solution, the driving shaft, the driven shaft, and the output shaft form a triangle, and with the gear radius unchanged, the outer contour area of the total plane is the smallest, saving more space.

[0017] 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 makes up the actuator needs to be completed one by one before the installation of structures such as the pulley housing cover can be carried out, 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.

[0018] In this solution, first, the driving part, the driving gear, the intermediate gear, and the driven gear of the actuator are integrated on the housing. The supplier can assemble the actuator in advance and sell it unified. 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 lead screw of the actuator and the moving disk of the transmission, thus achieving rapid assembly. Finally, the pulley housing cover and the housing can be connected through parts such as bolts.

[0019] 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, which is more convenient for maintenance.

[0020] 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 gears by moving the moving disk axially along the output shaft, the structure that pushes the moving disk will not be blocked by the fixed disk, enabling the realization of the above-mentioned external hanging technology.

[0021] 4. Since the inclined surface of the signal block is inclined, there is a difference in the distance between the end of the inclined surface close to the end of the output shaft and the end far from the end of the output shaft and the distance sensor. When shifting gears, 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 by 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 measurement mechanism is smaller.

[0022] 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. Description of the Drawings

[0023] Figure 1 Top view of the installation on the transmission for Embodiment 1; Figure 2 Front view of the installation on the transmission for Embodiment 1; Figure 3 For Figure 2 A - A sectional view; Figure 4 Top view of the installation on the transmission for Embodiment 2; Figure 5 For Figure 4 A - A sectional view; Figure 6 For Figure 4 B - B sectional view. Detailed Embodiment

[0024] The following is further detailed through specific embodiments: The reference numerals in the accompanying drawings of the specification include: housing 1, moving disk 2, motor 3, driving gear 4, driving shaft 41, external gear 42, internal gear 43, intermediate gear 5, intermediate shaft 51, small intermediate gear 52, large intermediate gear 53, driven gear 6, driven shaft 61, threaded portion 62, lead screw 7, distance sensor 81, signal block 82, housing cover 9.

[0025] Embodiment 1 Embodiment 1 is basically as Figures 1-3As shown: The motorcycle ECVT actuator includes a housing 1, which is arranged between the gearbox and the motorcycle body, and the driving disk 2 of the gearbox is arranged on the side close to the motorcycle body. A driving member and a transmission mechanism are arranged inside the housing 1. The driving member is a motor 3, and the driving member is bolted to the motorcycle body. The transmission mechanism includes a driving shaft 41, an intermediate shaft 51 and a driven shaft 61. The central axes (centers) of the driving shaft 41, the intermediate shaft 51 and the driven shaft 61 are connected to form a triangle; As Figure 3 shown, the upper side in the figure is the side close to the motorcycle body; the lower end of the driving shaft 41 is assembled and rotationally connected to the outer 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 4. The internal gear 43 is arranged above the external gear 42 and has an upward opening, and meshes with the output shaft of the driving member. The output shaft of the driving member is eccentrically arranged relative to the internal gear 43.

[0026] The intermediate shaft 51 is inserted into the housing 1 and rotationally connected to the housing 1. A small intermediate gear 52 and a large intermediate gear 53 are integrally formed coaxially on the intermediate shaft 51. The small intermediate gear 52 is arranged below the large intermediate gear 53, and the large intermediate gear 53 meshes with the external gear 42. The intermediate shaft 51, the small intermediate gear 52 and the large intermediate gear 53 form an intermediate gear 5.

[0027] The upper end of the driven shaft 61 is inserted into and rotationally connected to the motorcycle body. A driven gear 6 is integrally formed on the driven wheel. A ball bearing is arranged between the driven gear 6 and the driven shaft 61. The driven gear 6 meshes with the small intermediate gear 52. A threaded portion 62 is arranged on the lower surface of the driven gear 6. A lead screw 7 is sleeved and threadedly connected outside the threaded portion 62. The lead screw 7 is a tubular object with internal threads. The lower end of the lead screw 7 is used to be clamped with the driving disk 2 in the gearbox. After the lower end of the lead screw 7 is clamped, the lead screw 7 and the driving disk 2 move axially together. In this embodiment, the chuck is partially inserted into the lead screw 7 and clamped to achieve the clamping connection.

[0028] An inner channel (not shown in the figure) is formed by inward protrusion on the inner side of the housing 1. A limit block is integrally formed on the lead screw 7, and the limit block is slidably arranged in the inner channel. The inner channel is used to limit the rotation of the limit block and the lead screw 7.

[0029] Embodiment 2 As Figures 4-6 shown, the difference between Embodiment 2 and Embodiment 1 is that: the housing 1 is installed on the outer surface of the gearbox, and correspondingly, the driving disk 2 of the gearbox is arranged on the side far from the motorcycle body.

[0030] It further includes a housing cover 9. The housing 1 and the housing cover 9 cooperate to protect the transmission mechanism inside, as Figure 6As shown in the figure, the lower side is closer to the motorcycle body and the transmission side. The driving part is bolted inside the housing 1. Compared with Embodiment 1, the structure of the driving gear 4 is upside down: the internal gear 43 is arranged below the external gear 42 and the opening is downward, and meshes with the output shaft of the driving part; the structures and meshing methods of the intermediate gear 5 and the driven gear 6 remain unchanged. The upper end of the driving shaft 41 is assembled and fitted with the housing cover 9 using a shoulder bushing.

[0031] The driven shaft 61 and the upper surface of the driven gear 6 are integrally formed. A ball bearing is provided between the driven shaft 61 and the housing cover 9, so that the driven shaft 61 and the housing cover 9 are rotatably connected.

[0032] As Figure 5 shown in the figure, a displacement measuring unit is provided in one direction outside the lead screw 7. The displacement measuring unit includes a distance sensor 81 and a signal block 82. The signal block 82 is the limit block in Embodiment 1. The signal block 82 is integrally formed outside the lead screw 7. The distance sensor 81 is bolted inside the housing 1. One side of the signal block 82 facing the distance sensor 81 is provided with an inclined surface. The distance between the end of the inclined surface close to the output shaft and the output shaft is greater than or less than the distance between the other end and the output shaft. 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 inclined surface.

[0033] Embodiment 3 On the basis of Embodiment 2, in Embodiment 3: several first limiting parts are welded circumferentially and equiangularly on one side of the driven gear 6 close to the lead screw 7. The specific number is determined according to the design. In this embodiment, three first limiting parts are welded. The first limiting part is a pin. When the lead screw 7 rotates and approaches the driven gear 6 to the limit position, the signal block 82 on the lead screw 7 abuts against one of the pins, so as to prevent the lead screw 7 from directly hitting the driven gear 6, thereby avoiding damage to the ball bearing between the driven gear 6 and the driven shaft 61.

[0034] Embodiment 4 On the basis of Embodiment 2, in Embodiment 4: as an improved scheme of Embodiment 2, since the thickness of the driven gear 6 is usually not too thick, if the pin is directly welded on the driven gear 6, it is easy to affect the mechanical properties of the driven gear 6.

[0035] Therefore, in this scheme, three arc-shaped grooves are provided circumferentially on one side of the driven gear 6 close to the lead screw 7. The part between the arc-shaped grooves is relatively convex to form the first limiting part; a second limiting part is provided on one side of the signal block 82 close to the driven gear 6. The projection of the rotation trajectory of the second limiting part is within the range of the arc-shaped groove and the first limiting part. When the lead screw 7 rotates and approaches the driven gear 6 to the limit position, the second limiting part first turns into the arc-shaped groove, and then the second limiting part continues to rotate until it abuts against the first limiting part.

[0036] Embodiment 5 The difference between Embodiment 5 and Embodiment 2 is that the signal block 2 in Embodiment 2 is strip-shaped and extends along the axial direction of the 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 coating a plastic shell outside the magnet. The signal block 2 is installed on the 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 faces the signal block 2. Compared with Embodiment 2, the Hall sensor in this embodiment uses the Hall effect to detect the moving distance of the signal block 2.

[0037] The limiting hole includes a positioning notch for accommodating the signal block 82, and the signal block 82 and the positioning notch cooperate to limit the rotation of the lead screw 7.

[0038] 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 herein. 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 and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. Motorcycle ECVT actuator, characterized in that: It includes a driving member and a transmission mechanism. The transmission mechanism includes a driving gear, an intermediate gear, and a driven gear that are meshed in sequence. A threaded portion is provided on the driven gear, and a lead screw is threadedly connected to the threaded portion. The driving member drives the lead screw to axially move the moving disk.

2. The motorcycle ECVT actuator according to claim 1, wherein: The driving gear includes an outer gear and an inner gear that are coaxially connected. The output shaft of the driving member meshes with the inner gear, and the outer gear meshes with the intermediate gear.

3. The motorcycle ECVT actuator according to claim 1, characterized in that: The intermediate gear includes a small intermediate gear and a large intermediate gear that are coaxially connected. The large intermediate gear meshes with the outer gear of the driving gear, and the small intermediate gear meshes with the driven gear.

4. The motorcycle ECVT actuator according to claim 1, characterized in that: The lead screw is a tubular object with a thread provided on the inner side. One end of the lead screw is used for detachably connecting to the moving disk in the gearbox, and the other end of the lead screw is sleeved outside the driving gear and threadedly connected to the driving gear.

5. The motorcycle ECVT actuator according to claim 4, wherein: A displacement measuring unit is provided laterally on the lead screw. The displacement measuring unit includes a distance sensor and a signal block. The signal block is provided on the lead screw and can move along with the 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 the 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 actuator according to claim 5, characterized in that: The limiting hole includes a positioning notch for accommodating the signal block. The signal block and the positioning notch cooperate to limit the rotation of the lead screw.

7. The motorcycle ECVT actuator according to claim 1, characterized in that: It includes a housing. The housing is arranged between the gearbox and the motorcycle body. The moving disk of the gearbox is arranged on the side close to the motorcycle body.

8. The motorcycle ECVT actuator according to claim 1, characterized in that: It includes a housing. The housing is installed on the outer surface of the gearbox. The moving disk of the gearbox is arranged on the side away from the motorcycle body.

9. 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 lead screw. Before the lead screw abuts against the driven gear, the first limiting portion abuts against the signal block.

10. The continuously variable transmission and motorcycle according to claim 9, characterized in that: A plurality of arc-shaped grooves are provided circumferentially on the side of the driven gear close to the lead screw. The portions between the arc-shaped grooves protrude relatively to form the 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 lead screw abuts against the driven gear, the first limiting portion abuts against the second limiting portion.

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