Motor torque output gear structure of electric power-assisted bicycle

Abstract

The utility model relates to a torque output gear structure of an electric power-assisted bicycle motor. The torque output gear structure comprises a torque sensor center shaft, a torque sensor, a one-way needle bearing, a needle bearing and a three-stage output gear set. The torque sensor center shaft is coaxially sleeved with a second bearing, a torque sensor, a needle bearing and a three-stage gear output set from bottom to top. A first bearing, a first check ring and a second clamping ring are used for limiting up-and-down movement of a three-level output gear set, and the problem of axial fixing of an output gear on a torque shaft is solved. The first check ring metal part ensures that the third-stage output gear set is meshed with the third-stage input gear more stably; under the condition of ensuring large torque transmission, the internal stacking space of the motor is saved, the size of the motor is reduced, and the cost is reduced. According to the transmission mechanism, by applying the torque output gear structure of the electric power-assisted bicycle motor, one-way transmission of power is guaranteed, vibration generated by abnormal gears is reduced, and the noise effect is reduced.

Description

Technical Field

[0001] The utility model relates to the field of motors for electric-assisted bicycles, and particularly relates to a torque output gear structure of a motor for an electric-assisted bicycle. Background Art

[0002] With the continuous development of the electric-assisted bicycle market, more and more consumers begin to pay attention to the technology and performance of electric-assisted bicycles. In an electric-assisted bicycle, the motor is a very important component, which directly affects the power and performance of the vehicle.

[0003] Motors for electric-assisted bicycles are mainly divided into two types: traditional hub motors and mid-drive motors. A traditional hub motor is designed by integrating the "power system, transmission system, and braking system" of the vehicle. The motor is directly installed inside the wheel hub and drives the wheel to rotate by converting electrical energy into mechanical energy. A mid-drive motor is installed in the middle of the frame and transmits power to the rear wheel through a transmission mechanism, thereby driving the vehicle forward. Compared with traditional hub motors, mid-drive motors have greater torque, faster acceleration, and stronger climbing ability. However, the mid-drive motor is directly installed in the middle of the vehicle, with a high rotational speed and large working noise, and the manufacturing cost and later maintenance and use costs of this type of motor are relatively high.

[0004] At present, the power generated by the motor of an electric-assisted bicycle is transmitted to the vehicle through a transmission mechanism. The transmission mechanism of the motor of an electric-assisted bicycle usually includes a multi-stage transmission gear structure, and the power is finally transmitted to the vehicle through the torque output gear structure in the transmission mechanism. Vibration will occur during the power transmission process. In order to ensure unidirectional power transmission and large torque output, currently, the torque output gear is axially limited by two upper and lower bearings. This has a certain effect on the axial fixation of the torque output gear structure, but it also brings certain negative effects. On the one hand, a special support bracket needs to be designed for the bearing below the gear, occupying the space below the torque output gear. On the other hand, all relevant components on the gear structure also need to be lengthened; as a result, the overall size of the motor of the electric-assisted bicycle is relatively large, and the manufacturing cost is relatively high. Therefore, a new torque output gear structure for the motor of an electric-assisted bicycle is needed to solve the above problems. Summary of the Utility Model

[0005] To solve the above technical problems, on the one hand, the utility model provides a torque output gear structure of a motor for an electric-assisted bicycle, which can solve the axial fixation problem of the torque output gear structure; while ensuring the transmission of large torque, it saves the internal stacking space of the motor and reduces costs. On the other hand, the utility model provides a transmission mechanism, by applying the above torque output gear structure, it can improve the stability of gear meshing, ensure unidirectional power transmission, reduce the vibration generated by the gears, and reduce noise.

[0006] The technical solution of the present utility model is as follows:

[0007] An electric assist bicycle motor torque output gear structure, comprising a torque sensor central shaft, a torque sensor, a one-way needle bearing, a needle bearing, and a three-stage output gear set;

[0008] The torque sensor central shaft coaxially sleeved with a second bearing, a torque sensor, a needle bearing, and a three-stage output gear set from bottom to top;

[0009] The one-way needle bearing is coaxially nested between the torque sensor and the three-stage output gear set to play a role in transmitting torque;

[0010] There is a cut groove on the middle and lower parts of the torque sensor central shaft, namely a first cut groove and a second cut groove respectively;

[0011] The torque sensor central shaft is provided with a second retaining ring, a second snap ring, and a first retaining ring from bottom to top;

[0012] The three-stage output gear set includes a gear and a spline;

[0013] A first bearing and a first snap ring are nested on the three-stage output gear set.

[0014] Further, the first retaining ring is located between the second snap ring on the torque sensor central shaft and the inner end face of the three-stage output gear set.

[0015] Further, the first snap ring is nested on the three-stage output gear set and is located above the first bearing.

[0016] Further, the second snap ring is located in the first cut groove in the middle of the torque sensor central shaft;

[0017] Further, the second snap ring is located between the torque sensor and the first retaining ring.

[0018] Further, the second retaining ring is located in the second cut groove at the lower part of the torque sensor central shaft, between the second bearing and the torque sensor.

[0019] Further, the first bearing and the second bearing are deep groove ball bearings.

[0020] Further, the gear of the three-stage output gear set meshes with the three-stage input gear, and the power is transmitted to the vehicle through the spline of the three-stage output gear set.

[0021] Compared with the prior art, the beneficial effects obtained by the present utility model include:

[0022] 1. The torque output gear structure of the electric assist bicycle motor provided by the present utility model restricts the up-and-down movement of the three-stage output gear set through the first bearing and the first retaining ring, solving the problem of axial fixation of the output gear on the torque shaft; combined with the second bearing and the needle bearing, it ensures the circular runout of the torque sensor central shaft and the three-stage output gear set; makes the rotation of the three-stage output gear set and the torque sensor central shaft smoother, and the engagement between the three-stage output gear assembly and the three-stage input gear more stable; while ensuring the transmission of large torque, it saves the stacking space inside the motor, compresses the motor size, and reduces costs.

[0023] 2. The torque output gear structure of the electric assist bicycle motor provided by the present utility model, the transmission mechanism transmits power to the three-stage input gear through multiple gears; the three-stage input gear meshes with the three-stage output gear of the torque output gear structure of the electric assist bicycle motor, and the power is transmitted to the vehicle through the spline of the torque output gear structure of the electric assist bicycle motor. It can achieve the effects of improving the stability of gear engagement, ensuring one-way power transmission, reducing the vibration generated by abnormal gears, and reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. In all the drawings, similar elements or parts are generally denoted by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to actual scale.

[0025] Figure 1 It is a torque output gear structure diagram of an electric assist bicycle motor provided by the present application;

[0026] Among them: 1 - torque sensor central shaft; 2 - torque sensor; 3 - one-way needle bearing; 4 - needle bearing; 5 - three-stage output gear set; 6 - first cutting groove; 7 - second cutting groove; 8 - first retaining ring; 9 - second retaining ring; 10 - second snap ring; 11 - first bearing; 12 - first snap ring; 13 - second bearing; 14 - three-stage input gear; 501 - gear; 502 - spline. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some, but not all, of the embodiments of this application. In the following description, specific details such as specific configurations and components are provided only to assist in a comprehensive understanding of the embodiments of this 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 this application. Additionally, descriptions of known functions and structures are omitted in the embodiments for clarity and conciseness.

[0028] It should be understood that the term "one embodiment" or "this embodiment" mentioned throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, the appearances of the term "one embodiment" or "this embodiment" throughout the specification do not necessarily refer to the same embodiment. Moreover, these specific features, structures, or characteristics can be combined in one or more embodiments in any suitable manner.

[0029] In addition, this application may repeat reference numerals and / or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or arrangements discussed.

[0030] The term "and / or" in this document is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, B exists alone, and both A and B exist simultaneously. The term " / and" in this document describes another association relationship of associated objects, indicating that two relationships can exist. For example, A / and B can represent: A exists alone, and both A and B exist. Additionally, the character " / " in this document generally indicates that the associated objects before and after are in an "or" relationship.

[0031] The term "at least one" in this document is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, at least one of A and B can represent: A exists alone, both A and B exist simultaneously, and B exists alone.

[0032] It should also be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprises", "comprising", or any other variation thereof is intended to cover a non-exclusive inclusion. Embodiment

[0033] Please refer to Figure 1, an electric assist bicycle motor torque output gear structure, which includes a torque sensor central shaft 1, a torque sensor 2, a one-way needle bearing 3, a needle bearing 4, and a three-stage output gear set 5;

[0034] The torque sensor central shaft 1 coaxially sleeved with a second bearing 13, a torque sensor 2, a needle bearing 4, and a three-stage output gear set 5 from bottom to top;

[0035] The one-way needle bearing 3 is coaxially nested between the torque sensor 2 and the three-stage output gear set 5;

[0036] The middle and lower parts of the torque sensor central shaft 1 each have a circle of cut grooves, namely a first cut groove 6 and a second cut groove 7;

[0037] The torque sensor central shaft 1 is respectively provided with a second retaining ring 9, a second snap ring 10, and a first retaining ring 8 from bottom to top;

[0038] The three-stage output gear set 5 includes a gear 501 and a spline 502;

[0039] A first bearing 11 and a first snap ring 12 are nested on the three-stage output gear set 5.

[0040] Further, the first snap ring 12 is nested on the three-stage output gear set 5 and is located above the first bearing 11.

[0041] Further, the second snap ring 10 is located in the first cut groove 6 in the middle of the torque sensor central shaft.

[0042] Further, the second snap ring 10 is located between the torque sensor 2 and the first retaining ring 8.

[0043] Further, the first retaining ring 8 is located between the second snap ring 10 and the inner end face of the three-stage output gear set 5.

[0044] Further, the second retaining ring 9 is located in the second cut groove 7 at the lower part of the torque sensor central shaft.

[0045] Further, the first bearing 11 and the second bearing 13 are deep groove ball bearings.

[0046] The gear 501 of the three-stage output gear set meshes with the three-stage input gear 14, and the power is transmitted to the vehicle through the spline 502 of the three-stage output gear set.

[0047] The working principle of a torque output gear structure of an electric power-assisted bicycle motor is as follows: when the torque sensor central axis 1 rotates clockwise, the needle bearing 4 and the No. 1 bearing 11 ensure the circular rotation of the torque sensor central axis 1, and at the same time, the torque sensor central axis 1 transmits power to the torque sensor 2, and then transmits power to the three-stage output gear set through the one-way needle bearing 3, thereby outputting power to the vehicle through the spline 502 of the three-stage output gear set.

[0048] When the torque sensor shaft 1 rotates counterclockwise, it drives the torque sensor 2 to rotate. At this time, the one-way needle bearing 3 will not drive the three-stage output gear set 5 to rotate. The function of the one-way needle bearing 3 at this time is to prevent the transmission from being transmitted to the three-stage output gear set 5, ensuring that the vehicle rider can easily step on the pedal in the opposite direction to achieve the purpose of free pedaling in the reverse direction.

[0049] The technical effect achieved by this embodiment is as follows: the utility model provides an electric power-assisted bicycle motor torque output gear structure, in which the step above the three-stage output gear assembly is pressed by the second bearing, and the end face of the first bearing is limited by the shell, thereby limiting the upward axial movement of the three-stage output gear assembly; by supporting the inner end face of the three-stage output gear assembly, and then clamping the first clamping ring on the groove of the torque sensor center shaft with a clamping ring, the downward axial movement of the three-stage output gear assembly is limited; the problem of axial fixation of the output gear on the torque shaft is solved; the circular runout of the torque sensor center shaft and the three-stage output gear set is ensured, so that the three-stage output gear set and the torque sensor center shaft rotate more smoothly, and the meshing of the three-stage output gear assembly with the three-stage input gear is more stable; while ensuring the transmission of large torque, the internal stacking space of the motor is saved, the motor size is compressed, and the cost is reduced.

[0050] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific implementation method of the utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A motor torque output gear structure for an electric power-assisted bicycle, characterized in that: The structure comprises a torque sensor center shaft (1), a torque sensor (2), a one-way needle roller bearing (3), a needle roller bearing (4), and a three-stage output gear set (5); The torque sensor central shaft (1) is coaxially sleeved with a second bearing (13), a torque sensor (2), a needle bearing (4) and a three-stage output gear set (5) from bottom to top; The torque sensor central shaft (1) is respectively embedded with a No. 2 retaining ring (9), a No. 2 clamping ring (10) and a No. 1 retaining ring (8) from bottom to top; The one-way needle roller bearing (3) is coaxially nested between the torque sensor (2) and the three-stage output gear set (5); The middle and lower parts of the torque sensor central shaft (1) each have a circle of grooves, namely a first groove (6) and a second groove (7); The three-stage output gear set (5) comprises a gear (501) and a spline (502); A first bearing (11) and a first retaining ring (12) are embedded in the third-stage output gear set (5).

2. The electric power-assisted bicycle motor torque output gear structure according to claim 1, characterized in that: The first retaining ring (12) is nested on the third-stage output gear set (5) and is located on the first bearing (11).

3. The electric power-assisted bicycle motor torque output gear structure according to claim 1, characterized in that: The first retaining ring (8) is located between the second retaining ring (10) on the center shaft (1) of the torque sensor and the inner end surface of the third-stage output gear set (5).

4. The electric power-assisted bicycle motor torque output gear structure according to claim 1, characterized in that: The second retaining ring (10) is located between the torque sensor (2) and the first retaining ring (8), and in the first groove (6) of the center shaft of the torque sensor.

5. The electric power-assisted bicycle motor torque output gear structure according to claim 1, characterized in that: The No. 2 retaining ring (9) is located in the No. 2 groove (7) of the center shaft of the torque sensor, between the No. 2 bearing (13) and the torque sensor (2).

6. The electric power-assisted bicycle motor torque output gear structure according to claim 1, characterized in that: The first bearing (11) and the second bearing (13) are deep groove ball bearings.

7. The electric power-assisted bicycle motor torque output gear structure according to claim 1, characterized in that: The gear (501) of the three-stage output gear set meshes with the three-stage input gear (14), and power is transmitted to the vehicle through the spline (502) of the three-stage output gear set.

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