Torque sensing assembly and middle motor

By employing a spline groove and limiting ring structure in the torque sensing component of the electric bicycle's central shaft torque sensor, the problem of outer ring movement was solved, achieving high-precision detection and stable connection, and improving the speed measurement accuracy and reliability of the central motor.

CN224392878UActive Publication Date: 2026-06-23ZHEJIANG LUYUAN ELECTRIC VEHICLE
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Patent Information

Application Number
CN202521381673.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-07-02
Publication Date
2026-06-23
Estimated Expiration
2035-07-02

AI Technical Summary

Technical Problem

The outer ring of the torque sensor for the central shaft of existing electric bicycles is prone to shifting, which reduces the detection accuracy.

Method used

The torque sensing components, including a torque converter, a limit ring, and a positioning component, are used to ensure that the inner ring is fixed to the central shaft and the outer ring is fixed relative to the motor housing through structures such as spline grooves and spline mating, limit grooves and protrusions, and positioning grooves and bearings, thus achieving a stable connection.

Benefits of technology

This improved the detection accuracy of the torque sensor and the speed measurement accuracy of the mid-mounted motor, ensuring the reliability and stability of the sensor.

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Abstract

The utility model belongs to the technical field of middle motors, and discloses a torque sensing assembly and a middle motor, the torque sensing assembly is installed between a middle shaft and a motor shell, the torque sensing assembly comprises a torquer, a limiting ring and two positioning pieces, the torquer is provided with an inner ring and an outer ring, and the limiting ring is arranged on the inner ring. A spline groove matched with a spline on the middle shaft is formed in an inner ring of the torquer, a signal line of the torquer is connected to an outer ring and penetrates out of the motor shell in the axial direction of the middle shaft, the limiting ring is installed in an installation hole of the motor shell, and the limiting ring is arranged at the first end of the torquer in a sleeving mode and limits the outer ring in the circumferential direction of the torquer; the two positioning pieces are installed on the middle shaft and abut against the first end and the second end of the inner ring respectively. The installation stability of the torque sensing assembly is good, the torque sensing assembly is not easy to move in the testing process, and the detection precision is ensured.
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