Shifting fork gear shifting mechanism of middle motor harmonic reducer

Abstract

The utility model discloses a shifting fork gear shifting mechanism of a middle motor harmonic reducer. The shifting fork gear shifting mechanism comprises an output gear, a first transmission gear, a second transmission gear, a transmission shaft, a third transmission gear, a gear shifting spline, a fourth transmission gear, a one-way needle bearing, a movable ring, a gear shifting motor, a lead screw, a gear shifting rod, a fifth transmission gear, a polished rod, a main shaft and a motor shell. Further gear shifting adjustment can be achieved between the harmonic reducer and the main shaft, a flexible gear in the harmonic reducer is connected with an output gear, when the reduction ratio does not need to be increased, a gear shifting motor drives a lead screw to move, a gear shifting rod is made to move towards the left side, a gear shifting spline is connected with a fifth transmission gear in a meshed mode, and gear shifting is achieved. The gear shifting spline drives the main shaft to rotate through the one-way needle bearing, and equal-ratio transmission is achieved at the moment. When the reduction ratio needs to be increased, the gear shifting rod moves towards the right side, the gear shifting spline is in meshed connection with the fourth transmission gear at the moment, the gear shifting spline drives the main shaft to rotate through the one-way needle bearing, and speed reduction transmission is achieved at the moment.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of middle -placed motor, concretely relates to a yoke gear shifting mechanism of middle -placed motor harmonic reducer. BACKGROUND

[0002] In view of the compact size, high reduction ratio, multiple teeth meshing at the same time, stable transmission, strong bearing capacity and high transmission precision of harmonic reducer, the device has been widely used in many fields. Especially in the field of high technology such as aerospace, military and industrial robot, harmonic reducer has become an indispensable key component. It is mainly composed of three core components: wave generator, flexible gear and rigid gear. The wave generator is responsible for generating the required wave motion, the flexible gear can adapt to this wave motion and transmit power, and the rigid gear works with the flexible gear to complete the reduction task. The precise cooperation of the three components makes the harmonic reducer perform well in various complex working conditions, becoming an indispensable part of modern mechanical transmission system.

[0003] Currently, harmonic reduction middle -placed motor has been widely used in various electric bicycles. The motor is a high-efficiency low-speed motor manufactured by combining brushless permanent magnet motor with harmonic reducer. Its clever design installs the motor in the inner circle of the electric bicycle middle shaft support, so that the driving shaft of the harmonic reduction middle -placed motor is coaxial with the middle shaft of the pedal crank, thereby realizing more efficient and stable transmission effect. This integrated design not only improves the overall performance of electric bicycle, but also simplifies the installation and maintenance process of motor. Therefore, the application of harmonic reduction middle -placed motor in electric bicycle field is increasingly popular, and it has become an indispensable important part of modern electric bicycle.

[0004] In the current technical field, harmonic reducer generally has the characteristics of fixed reduction ratio, that is, the reduction ratio cannot be adjusted during operation. However, in some specific applications, such as vehicle climbing process, higher reduction ratio is needed to enhance the traction. In these cases, the traditional middle -placed motor design cannot realize the dynamic adjustment of reduction ratio, which limits the performance of vehicle in specific working conditions such as climbing.

[0005] Therefore, how to provide a yoke gear shifting mechanism of middle -placed motor harmonic reducer to solve the problems existing in the prior art is of great significance to its application. INVENTION CONTENTS

[0006] Therefore, the purpose of the present application is to provide a yoke gear shifting mechanism of middle -placed motor harmonic reducer to solve the problem that the traditional middle -placed motor design cannot realize the dynamic adjustment of reduction ratio, which limits the performance of vehicle in specific working conditions such as climbing.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] A shift fork shift mechanism of a mid-mounted motor harmonic reducer, comprising an output gear, a first transmission gear, a second transmission gear, a transmission shaft, a third transmission gear, a shift spline, a fourth transmission gear, a one-way needle roller bearing, a movable ring, a shift motor, a lead screw, a shift lever, a fifth transmission gear, a polished rod, a main shaft, and a motor housing;

[0009] The main shaft is rotatably connected to the motor housing via a bearing, the output gear, transmission gear five, and transmission gear four are rotatably connected to the main shaft via bearings, the transmission gear one, transmission gear two, and transmission gear three are mounted on the transmission shaft, both ends of the transmission shaft are rotatably connected to the motor housing, the shift spline is transmission-connected to the main shaft via a one-way needle roller bearing, and the shift spline is mounted inside the movable ring via a bearing.

[0010] Preferably, the output gear is meshed and connected with the transmission gear 1, the transmission gear 5 is meshed and connected with the transmission gear 2, and the transmission gear 3 is meshed and connected with the transmission gear 4.

[0011] Preferably, the shift motor is installed inside the motor housing, the output shaft of the shift motor is connected to the screw rod, the optical rod is installed inside the motor housing, the shift rod is slidingly connected to the optical rod, one end of the shift rod is threadedly connected to the screw rod, and the other end of the shift rod is fixedly connected to the movable ring.

[0012] Preferably, protrusions are provided on both sides of the shift spline, and the transmission gear four and the transmission gear five are provided with connecting keys facing the shift spline, and the protrusions on both sides of the connecting key shift spline match, and the shift spline is located between the transmission gear four and the transmission gear five.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The utility model can realize further gear shifting adjustment between the harmonic reducer and the main shaft. The flexible wheel in the harmonic reducer is connected to the output gear. When the reduction ratio does not need to be increased, the shift motor drives the lead screw to move, so that the shift rod moves to the left. At this time, the shift spline is engaged with the transmission gear five, and the shift spline drives the main shaft to rotate through the one-way needle roller bearing. At this time, it is a constant ratio transmission; when the reduction ratio needs to be increased, the shift rod moves to the right. At this time, the shift spline is engaged with the transmission gear four, and the shift spline drives the main shaft to rotate through the one-way needle roller bearing. At this time, it is a reduction transmission.

[0015] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, so as to be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following will be described in detail with the preferred embodiment of the present application and the accompanying drawings as follows.

[0016] According to the detailed description of the specific embodiments of the present application in the following combined with the drawings, those skilled in the art will more clearly understand the above and other purposes, advantages and characteristics of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0018] Fig. 1 Structure diagram of the present application;

[0019] Fig. 2 Structure explosion diagram of the present application.

[0020] In the figure: 1, output gear; 2, transmission gear one; 3, transmission gear two; 4, transmission shaft; 5, transmission gear three; 6, shift spline; 7, transmission gear four; 8, one-way needle bearing; 9, movable ring; 10, shift motor; 11, screw rod; 12, shift lever; 13, transmission gear five; 14, polished rod; 15, main shaft; 16, motor housing. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely in the following combined with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. In the following description, the specific details such as specific configurations and components are only provided to help understand the embodiments of the present application. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, in order to be clear and concise, the description of known functions and structures is omitted in the embodiments.

[0022] Furthermore, reference numerals and / or letters can be repeated in different instances in the present application. Such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and / or arrangements discussed.

[0023] The term "and / or", merely describes an associated relationship between associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases, A alone, B alone, and A and B together. The term " / " in this paper is used to describe another relationship between associated objects, which means that there can be two relationships, for example, A / and B, which means that there are two cases, A alone and A and B together. In addition, the character " / " in this paper generally represents an "or" relationship between the associated objects before and after it.

[0024] It should also be noted that in this paper, relationship terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion.

[0025] Please refer to Figs. 1-2 The present application provides a kind of technical scheme of shifting mechanism of middle motor harmonic reducer fork: including output gear 1, transmission gear one 2, transmission gear two 3, transmission shaft 4, transmission gear three 5, shift spline 6, transmission gear four 7, one-way needle bearing 8, movable ring 9, shift motor 10, screw rod 11, shift lever 12, transmission gear five 13, light pole 14, main shaft 15, motor housing 16;

[0026] Main shaft 15 is rotatably connected with motor housing 16, output gear 1, transmission gear five 13, transmission gear four 7 are rotatably connected with main shaft 15, transmission gear one 2, transmission gear two 3, transmission gear three 5 are installed on transmission shaft 4, both ends of transmission shaft 4 are rotatably connected with motor housing 16, shift spline 6 is drivingly connected with main shaft 15 by one-way needle bearing 8, shift spline 6 is installed in the inside of movable ring 9 by bearing.

[0027] Output gear 1 is meshingly connected with transmission gear one 2, transmission gear five 13 is meshingly connected with transmission gear two 3, transmission gear three 5 is meshingly connected with transmission gear four 7.

[0028] Shift motor 10 is installed in the inside of motor housing 16, the output shaft of shift motor 10 is drivingly connected with screw rod 11, light pole 14 is installed in the inside of motor housing 16, shift lever 12 is slidingly connected with light pole 14, one end of shift lever 12 is threadedly connected with screw rod 11, the other end of shift lever 12 is fixedly connected with movable ring 9.

[0029] The shift spline 6 is provided with protrusions on both sides, the transmission gear four 7 and the transmission gear five 13 are provided with connecting keys towards the shift spline 6, the connecting keys match the protrusions on both sides of the shift spline 6, and the shift spline 6 is located between the transmission gear four 7 and the transmission gear five 13.

[0030] In specific use, the same ratio transmission is adopted: the flexible gear drives the output gear 1 to rotate, the output gear 1 drives the transmission gear one 2 to rotate, at this time, the transmission gear one 2, the transmission gear two 3 and the transmission gear three 5 are installed on the transmission shaft 4, the transmission gear one 2, the transmission gear two 3 and the transmission gear three 5 rotate simultaneously, and the transmission gear five 13 is connected with the transmission gear two 3 in meshing, and the transmission gear three 5 is connected with the transmission gear four 7 in meshing, at this time, the transmission gear five 13 drives the output gear 1 at the same speed, and the transmission gear four 7 and the output gear 1 are in speed reduction transmission, the shift rod 12 is moved to the left side by the shift motor 10 driving the lead screw 11, at this time, the shift spline 6 is connected with the transmission gear five 13 in meshing, and the shift spline 6 drives the main shaft 15 to rotate through the one-way needle bearing 8, at this time, it is equal ratio transmission.

[0031] Increase the speed reduction ratio transmission: the shift rod 12 is moved to the right side by the shift motor 10 driving the lead screw 11, at this time, the shift spline 6 is connected with the transmission gear four 7 in meshing, and the shift spline 6 drives the main shaft 15 to rotate through the one-way needle bearing 8, at this time, it is speed reduction transmission.

[0032] The above only describes preferred embodiments of the present application, and does not limit the protection scope of the present application. For those skilled in the art, the present application can be variously changed and modified. Any change, modification, replacement, integration and parameter change of the embodiments within the spirit and principle of the present application, which can realize the same function without departing from the principle and spirit of the present application, falls within the protection scope of the present application.

Claims

1. A shift fork shift mechanism for a mid-mounted motor harmonic reducer, characterized by: It includes an output gear (1), a transmission gear 1 (2), a transmission gear 2 (3), a transmission shaft (4), a transmission gear 3 (5), a shift spline (6), a transmission gear 4 (7), a one-way needle bearing (8), a movable ring (9), a shift motor (10), a screw rod (11), a shift rod (12), a transmission gear 5 (13), a polished rod (14), a main shaft (15), and a motor housing (16); The main shaft (15) is rotatably connected to the motor housing (16) via a bearing, the output gear (1), the transmission gear five (13), and the transmission gear four (7) are all rotatably connected to the main shaft (15) via a bearing, the transmission gear one (2), the transmission gear two (3), and the transmission gear three (5) are all mounted on the transmission shaft (4), and both ends of the transmission shaft (4) are rotatably connected to the motor housing (16), the shift spline (6) is transmission-connected to the main shaft (15) via a one-way needle bearing (8), and the shift spline (6) is mounted inside the movable ring (9) via a bearing.

2. The shift fork shift mechanism of a mid-motor harmonic reducer according to claim 1, characterized in that: The output gear (1) is meshed and connected with the transmission gear 1 (2), the transmission gear 5 (13) is meshed and connected with the transmission gear 2 (3), and the transmission gear 3 (5) is meshed and connected with the transmission gear 4 (7).

3. The shift fork shift mechanism of a mid-mounted motor harmonic reducer according to claim 2, characterized in that: The shift motor (10) is installed inside the motor housing (16), the output shaft of the shift motor (10) is transmission-connected to the screw rod (11), the polished rod (14) is installed inside the motor housing (16), the shift rod (12) is slidingly connected to the polished rod (14), one end of the shift rod (12) is threadedly connected to the screw rod (11), and the other end of the shift rod (12) is fixedly connected to the movable ring (9).

4. The shift fork shift mechanism of a mid-mounted motor harmonic reducer according to claim 3, characterized in that: The shift spline (6) is provided with protrusions on both sides, and the transmission gear four (7) and the transmission gear five (13) are provided with connecting keys facing the shift spline (6). The protrusions on both sides of the connecting key and the shift spline (6) match each other, and the shift spline (6) is located between the transmission gear four (7) and the transmission gear five (13).

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