Positioning device of middle motor torque fixing sleeve of electric power-assisted bicycle

Abstract

The utility model relates to a positioning device for a torque fixing sleeve of a built-in motor of an electric power-assisted bicycle, which comprises the torque fixing sleeve, four right positioning grooves and two left positioning grooves are respectively arranged at two ends of the torque fixing sleeve, and the right positioning grooves and the left positioning grooves are distributed along the circumferential direction; the inner wall of the shell is provided with a protruding structure matched with the right positioning groove and the left positioning groove, and the protruding structure is used for being clamped and positioned with the torque fixing sleeve. The problems that positioning reliability is insufficient, stress balance is poor, and installation and debugging are complex are solved.

Description

Technical Field

[0001] This utility model relates to electric-assisted bicycles, and more particularly to a positioning device for a torque fixing sleeve of a central motor in an electric-assisted bicycle. Background Technology

[0002] In the existing technology, the torque fixing sleeve of the mid-drive motor of electric-assist bicycles generally has the following technical problems in its positioning connection with the housing:

[0003] Insufficient positioning reliability: Traditional fixed sleeves often use a single direction or a small number of positioning structures, which makes the torque sensor prone to rotation or unilateral displacement when subjected to force, affecting the accuracy of torque signal acquisition.

[0004] Poor force balance: When the positioning structure layout is unreasonable, the connection points between the fixing sleeve and the housing are unevenly distributed. During the operation of the motor, the torque sensor may deform due to uneven force, which will reduce the life of the equipment in the long term.

[0005] Installation and debugging are complicated: The lack of standardized positioning structure design leads to repeated adjustments to the position of the fixing sleeve during installation, resulting in low installation efficiency and easy errors.

[0006] In the prior art, the positioning scheme of the torque fixing sleeve has failed to effectively solve the problems of circumferential anti-rotation and force balance. However, the "differentiated positioning groove layout at both ends" (four right positioning grooves and two left positioning grooves) proposed in this patent can significantly improve the positioning accuracy and structural stability of the fixing sleeve and the shell through symmetrical distribution and optimized quantity ratio, fundamentally solving the above-mentioned technical defects. Utility Model Content

[0007] This application provides a positioning device for the torque fixing sleeve of the central motor of an electric-assist bicycle, which solves the problems of insufficient positioning reliability, poor force balance and complicated installation and debugging in the prior art.

[0008] The technical solutions adopted in the embodiments of this application are as follows.

[0009] A positioning device for a torque fixing sleeve of a mid-mounted motor in an electric-assisted bicycle includes a torque fixing sleeve with four right positioning grooves and two left positioning grooves at its two ends, the right positioning grooves and left positioning grooves being distributed circumferentially; and a housing with a protruding structure on its inner wall that matches the right positioning grooves and left positioning grooves for engaging and positioning with the torque fixing sleeve.

[0010] As a further improvement to the above technical solution:

[0011] The four right positioning grooves are evenly distributed at one end of the torque fixing sleeve, and the two left positioning grooves are symmetrically distributed at the other end.

[0012] The cross-sections of the right and left positioning slots are rectangular, trapezoidal, or arc-shaped.

[0013] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0014] 1. The design employs a multi-directional constraint structure created by a differentiated positioning slot layout at both ends (four evenly distributed right positioning slots + two symmetrically distributed left positioning slots). Compared to traditional single-direction or limited positioning point designs, this structure effectively restricts the circumferential rotation and radial offset of the torque fixing sleeve, ensuring the torque sensor maintains a stable position under stress and significantly improving the accuracy of torque signal acquisition. The rectangular, trapezoidal, or arc-shaped positioning slots perfectly match the raised structure on the inner wall of the housing, resulting in a more rational distribution of contact points between the torque fixing sleeve and the housing. This design evenly distributes stress during motor operation to each positioning point, avoiding deformation of the fixing sleeve caused by localized stress concentration and extending the equipment's service life. The standardized positioning slot layout and symmetrical design provide clear directional guidance for the installation process. Installers can quickly complete the positioning and engagement of the torque fixing sleeve and the housing without repeated adjustments, greatly improving assembly efficiency and reducing positioning deviations caused by human error. The diverse designs of the positioning slot cross-sectional shapes (rectangular, trapezoidal, arc-shaped) allow selection based on the torque characteristics and operating environment of different motor models. This flexibility allows the positioning device to be adapted to a variety of mid-mounted motors, improving the product's versatility and market adaptability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the positioning device for the torque fixing sleeve of the central motor of the electric-assist bicycle according to this utility model.

[0016] Figure 2 This is a cross-sectional view of the positioning device for the torque fixing sleeve of the central motor of the electric-assist bicycle according to this utility model.

[0017] In the diagram: 6. Torque fixing sleeve; 11. Right positioning groove; 12. Left positioning groove; 4. Housing. Detailed Implementation

[0018] This application provides a positioning device for the torque fixing sleeve of the central motor of an electric-assist bicycle, which solves the problems of insufficient positioning reliability, poor force balance and complicated installation and debugging in the prior art.

[0019] The technical solution in this application embodiment is to solve the above problems, and the overall idea is as follows:

[0020] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0021] A positioning device for a torque fixing sleeve of a mid-mounted motor in an electric-assisted bicycle includes a torque fixing sleeve 6, which has four right positioning grooves 11 and two left positioning grooves 12 at its two ends, and the right positioning grooves 11 and left positioning grooves 12 are distributed circumferentially; and a housing 4, whose inner wall has protrusions that match the right positioning grooves 11 and left positioning grooves 12 for engaging and positioning with the torque fixing sleeve 6.

[0022] Four right positioning grooves 11 are evenly distributed at one end of the torque fixing sleeve 6, and two left positioning grooves 12 are symmetrically distributed at the other end.

[0023] The cross-sections of the right positioning groove 11 and the left positioning groove 12 are rectangular, trapezoidal or arc-shaped.

[0024] The adoption of a differentiated positioning slot layout at both ends (four right positioning slots 11 evenly distributed + two left positioning slots 12 symmetrically distributed) forms a multi-directional constraint structure. Compared to traditional single-direction or limited positioning point designs, this structure effectively restricts the circumferential rotation and radial offset of the torque fixing sleeve 6, ensuring the torque sensor maintains a stable position under stress and significantly improving the accuracy of torque signal acquisition. The rectangular, trapezoidal, or arc-shaped positioning slots perfectly match the raised structure on the inner wall of the housing 4, making the contact point distribution between the torque fixing sleeve 6 and the housing 4 more reasonable. This design evenly distributes the stress during motor operation to each positioning point, avoiding deformation of the fixing sleeve caused by localized stress concentration and extending the equipment's service life. The standardized positioning slot layout and symmetrical design provide clear directional guidance for the installation process. Installers can quickly complete the positioning and engagement of the torque fixing sleeve 6 and the housing 4 without repeated adjustments, greatly improving assembly efficiency and reducing positioning deviations caused by human error. The diverse designs of the positioning slot cross-sectional shapes (rectangular, trapezoidal, arc-shaped) can be selected according to the torque characteristics and operating environment of different motor models. This flexibility allows the positioning device to be adapted to a variety of mid-mounted motors, improving the product's versatility and market adaptability.

[0025] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0026] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A positioning device for a torque fixing sleeve of a mid-mounted motor in an electric-assist bicycle, characterized in that, Includes a torque fixing sleeve (6), which has four right positioning grooves (11) and two left positioning grooves (12) at its two ends, and the right positioning grooves (11) and left positioning grooves (12) are distributed circumferentially; and a shell (4), whose inner wall has a protrusion structure that matches the right positioning grooves (11) and left positioning grooves (12) for engaging and positioning with the torque fixing sleeve (6).

2. The positioning device for the torque fixing sleeve of the central motor of an electric-assist bicycle as described in claim 1, characterized in that, The four right positioning grooves (11) are evenly distributed at one end of the torque fixing sleeve (6), and the two left positioning grooves (12) are symmetrically distributed at the other end.

3. The positioning device for the torque fixing sleeve of the central motor of an electric-assisted bicycle as described in claim 1, characterized in that, The cross-sections of the right positioning groove (11) and the left positioning groove (12) are rectangular, trapezoidal or arc-shaped.

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