Torque fixing sleeve structure for built-in motor of electric power-assisted bicycle

Abstract

The utility model relates to a torque fixing sleeve structure for a built-in motor of an electric power-assisted bicycle. The torque fixing sleeve structure comprises a center shaft, a torque sensor, a shell, a circlip for a shaft, a torque fixing sleeve and a fixing screw, the torque sensor is sleeved on the middle shaft, and the axial movement of the torque sensor is limited by the elastic retainer ring for the shaft; the torque sensor is sleeved with the torque fixing sleeve, four right positioning grooves and two left positioning grooves are formed in the two ends of the torque fixing sleeve respectively, and the right positioning grooves and the left positioning grooves are clamped with the inner wall of the shell. The torque fixing sleeve is fixed to the shell through a fixing screw, a wiring port and a wiring channel groove are formed in the torque fixing sleeve, and a sensor wiring harness penetrates through the wiring port and is contained in the wiring channel groove. The problems of high cost, complex structure and difficult maintenance are solved.

Description

Technical Field

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

[0002] Currently, the torque sensor for the mid-mounted motor and the bottom bracket in electric-assist bicycles are generally integrated into a single design. This design has significant drawbacks and shortcomings:

[0003] Higher cost: The integrated structure results in a high degree of component integration and a complex manufacturing process, leading to an increase in overall cost.

[0004] Complex structure: The integration of various functional components increases the difficulty of design and manufacturing, and also makes the structure of the entire system more complicated.

[0005] Maintenance difficulties: When the torque sensor or the central shaft malfunctions, since they are designed as a single unit, the entire unit often needs to be replaced. It is not possible to repair or replace the damaged parts individually, which not only increases maintenance costs but also prolongs maintenance time, causing inconvenience to users.

[0006] Based on the shortcomings of the existing technology, this patent proposes a modular structure that separates the torque sensor from the central shaft through a torque fixing sleeve, in order to solve the problems of high cost, complex structure and difficult maintenance in the existing technology. Utility Model Content

[0007] This application provides a torque fixing sleeve structure for a mid-mounted motor in an electric-assist bicycle, which solves the problems of high cost, complex structure, and difficult maintenance in the prior art.

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

[0009] A torque fixing sleeve structure for a mid-drive motor of an electric-assist bicycle includes a bottom bracket, a torque sensor, a housing, an elastic retaining ring for the shaft, a torque fixing sleeve, and fixing screws. The torque sensor is sleeved on the bottom bracket, and the elastic retaining ring for the shaft restricts its axial movement. The torque fixing sleeve is sleeved on the outside of the torque sensor, and its two ends are respectively provided with four right positioning grooves and two left positioning grooves, which engage with the inner wall of the housing. The torque fixing sleeve is fixed to the housing by fixing screws, and it is provided with a cable routing port and a cable routing channel groove, through which the sensor cable harness passes and is accommodated in the cable routing channel groove.

[0010] As a further improvement to the above technical solution: the torque fixing sleeve and the torque sensor are interference fit or clearance fit.

[0011] As a further improvement to the above technical solution: a bearing is installed inside the housing, and the central shaft is rotatably connected to the housing through the bearing.

[0012] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0013] 1. By adopting a modular design that separates the torque sensor from the central shaft through a torque fixing sleeve, the drawbacks of the high integration of traditional integrated structures are overcome. Components can be manufactured independently, simplifying the production process, reducing processing complexity, and thus lowering overall production costs.

[0014] The torque fixing sleeve modularizes the assembly relationship between the torque sensor and the central shaft by engaging with the housing through a positioning groove and securing it with screws. Compared to an integrated design, each component functions independently, resulting in a simpler structure, reduced design and manufacturing complexity, and improved assembly efficiency.

[0015] When the torque sensor or bottom bracket malfunctions, the component can be replaced individually by removing the torque retaining sleeve, eliminating the need to replace the entire bottom bracket assembly. This significantly reduces maintenance costs and shortens repair time.

[0016] The torque retaining sleeve features a wiring port and a wiring channel groove, allowing the sensor wiring harness to pass through and be accommodated in an orderly manner, preventing tangling or compression. This improves wiring efficiency during assembly, reduces wiring wear, and enhances the reliability of electrical connections.

[0017] The torque fixing sleeve and the torque sensor can be fitted with either an interference fit or a clearance fit, allowing for flexible selection of the assembly method based on actual working conditions and improving structural adaptability. Meanwhile, the bearings within the housing ensure smooth rotation of the central shaft, reducing frictional losses and improving motor operating efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the torque fixing sleeve structure used for the mid-mounted motor of an electric-assist bicycle in this utility model.

[0019] Figure 2 This is a cross-sectional view of the torque fixing sleeve structure used for the mid-mounted motor of an electric-assist bicycle in this utility model.

[0020] In the diagram: 1. Central shaft; 2. Torque sensor; 3. Sensor wiring harness; 4. Housing; 5. Shaft retaining ring; 6. Torque fixing sleeve; 7. Fixing screw; 8. Bearing; 9. Wiring port; 10. Wiring channel groove; 11. Right positioning groove; 12. Left positioning groove. Detailed Implementation

[0021] This application provides a torque fixing sleeve structure for a mid-mounted motor in an electric-assist bicycle, which solves the problems of high cost, complex structure, and difficult maintenance in the prior art.

[0022] The technical solution in this application embodiment is to solve the above problems, and the overall idea is as follows:

[0023] 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.

[0024] A torque fixing sleeve structure for a mid-drive motor of an electric-assist bicycle includes a bottom bracket 1, a torque sensor 2, a housing 4, an elastic retaining ring 5 for the shaft, a torque fixing sleeve 6, and a fixing screw 7. The torque sensor 2 is sleeved on the bottom bracket 1, and the elastic retaining ring 5 for the shaft restricts its axial movement. The torque fixing sleeve 6 is sleeved on the outside of the torque sensor 2, and its two ends are respectively provided with four right positioning grooves 11 and two left positioning grooves 12, which are engaged with the inner wall of the housing 4. The torque fixing sleeve 6 is fixed to the housing 4 by the fixing screw 7, and it is provided with a cable routing port 9 and a cable routing channel groove 10. The sensor wire harness 3 passes through the cable routing port 9 and is accommodated in the cable routing channel groove 10.

[0025] The torque fixing sleeve 6 and the torque sensor 2 are either interference fit or clearance fit.

[0026] A bearing 8 is installed inside the housing 4, and the central shaft 1 is rotatably connected to the housing 4 through the bearing 8.

[0027] By employing a modular design that separates the torque sensor 2 from the central shaft 1 through a torque fixing sleeve 6, the drawbacks of the high integration of traditional integrated structures are overcome. Components can be manufactured independently, simplifying the production process, reducing processing complexity, and thus lowering overall production costs.

[0028] The torque fixing sleeve 6 modularizes the assembly relationship between the torque sensor 2 and the central shaft 1 by engaging with the housing 4 through a positioning groove and fixing with screws. Compared with the integrated design, each component has independent function, the structure is simpler, the design and manufacturing difficulty is reduced, and the assembly efficiency is improved.

[0029] When torque sensor 2 or central shaft 1 malfunctions, the component can be replaced individually by disassembling torque fixing sleeve 6, without needing to replace the entire central shaft 1 assembly. This significantly reduces maintenance costs and shortens maintenance time.

[0030] The torque fixing sleeve 6 is equipped with a wiring port 9 and a wiring channel groove 10, allowing the sensor wire harness 3 to pass through and be accommodated in an orderly manner within the groove, preventing the wire harness from becoming tangled or squeezed. This improves wiring efficiency during assembly, reduces wire harness wear, and enhances the reliability of electrical connections.

[0031] The torque fixing sleeve 6 and the torque sensor 2 can be fitted with either an interference fit or a clearance fit, allowing for flexible selection of the assembly method based on actual working conditions and improving structural adaptability. Meanwhile, the bearing 8 inside the housing 4 ensures smooth rotation of the central shaft 1, reduces frictional loss, and improves motor operating efficiency.

[0032] 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.

[0033] 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 torque fixing sleeve structure for a mid-drive motor of an electric-assist bicycle, characterized in that, The device includes a central shaft (1), a torque sensor (2), a housing (4), a shaft elastic retaining ring (5), a torque fixing sleeve (6), and a fixing screw (7). The torque sensor (2) is fitted on the central shaft (1), and the shaft elastic retaining ring (5) restricts its axial movement. The torque fixing sleeve (6) is fitted on the outside of the torque sensor (2), and its two ends are respectively provided with four right positioning grooves (11) and two left positioning grooves (12). The right positioning grooves (11) and the left positioning grooves (12) are engaged with the inner wall of the housing (4). The torque fixing sleeve (6) is fixed to the housing (4) by the fixing screw (7), and it is provided with a wiring port (9) and a wiring channel groove (10). The sensor wire harness (3) passes through the wiring port (9) and is accommodated in the wiring channel groove (10).

2. The torque fixing sleeve structure for a mid-mounted motor in an electric-assist bicycle as described in claim 1, characterized in that, The torque fixing sleeve (6) and the torque sensor (2) are either interference fit or clearance fit.

3. The torque fixing sleeve structure for a mid-mounted motor in an electric-assist bicycle as described in claim 2, characterized in that, The housing (4) is equipped with a bearing (8), and the central shaft (1) is rotatably connected to the housing (4) through the bearing (8).

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