Gear driving mechanism and automobile actuator

The micromotor-driven gear combination structure and shaft buffer design solve the problems of insufficient gear strength and salt spray resistance in the actuator, avoid damage to the potentiometer, and achieve a miniaturized and low-cost actuator design.

CN223306263UActive Publication Date: 2025-09-05DONGFENG FUJI THOMSON THERMOSTAT
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Patent Information

Application Number
CN202421832641.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-31
Publication Date
2025-09-05
Estimated Expiration
2034-07-31

AI Technical Summary

Technical Problem

In existing actuators, plastic gears are large due to insufficient strength, powder metallurgy gears are not resistant to salt spray, and in the potentiometer control method, gear shaft eccentricity causes the potentiometer pins to be disconnected or have poor contact, resulting in actuator failure.

Method used

It adopts a combined structure of a micromotor, worm, worm wheel, first transmission gear, second transmission gear and output gear. The output gear and potentiometer are indirectly transmitted through the rotating shaft. The combination of a plastic central rotating shaft and a powder metallurgy gear ring increases the gear strength and salt spray resistance. The rotating shaft is covered with rubber to buffer eccentric rotation.

Benefits of technology

It effectively avoids the damage of the potentiometer due to eccentric rotation, improves the salt spray resistance of the actuator, reduces the product volume and weight, and reduces costs.

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Abstract

The utility model relates to a gear driving mechanism and an automobile actuator, the gear driving mechanism comprises a micromotor, a worm, a worm gear, a first transmission gear, a second transmission gear and an output gear, the worm is fixedly arranged on an output shaft of the micromotor, the worm gear is in meshing transmission with the worm, the first transmission gear is in meshing transmission with the worm gear, and the second transmission gear is in meshing transmission with the output gear. The second transmission gear is in meshing transmission with the first transmission gear, and the output gear is in meshing transmission with the second transmission gear; a lower-end shaft hole of the output gear is connected with the upper end of a rotating shaft, and the lower end of the rotating shaft is inserted into a potentiometer shaft hole; the output gear rotates and drives the potentiometer to rotate through the rotating shaft, and the potentiometer directly feeds back the rotation angle of the output gear to the ECU. According to the utility model, the transitional rotating shaft is arranged between the output gear and the potentiometer, that is, the power between the output gear and the potentiometer is indirectly transmitted through the rotating shaft, so that the effect of buffering deformation is achieved, and the situation that pins of the potentiometer are disconnected or are in poor contact due to eccentric rotation of the output gear is effectively avoided.
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