Direct-current brush gear motor

Abstract

The invention relates to a direct-current brush gear motor, and relates to the field of gear motors, the direct-current brush gear motor comprises a driving motor and a speed reducing mechanism, the driving motor comprises a casing, and a stator and a rotor arranged in the casing; the speed reducing mechanism comprises a box body, a worm gear and a worm, the machine shell is connected to one side of the box body, the worm gear is rotationally connected into the box body, the worm penetrates through the box body, and the worm is meshed with the worm gear and connected with the output end of the rotor; an axial limiting structure is arranged on the worm, the axial limiting structure comprises a first limiting piece and a second limiting piece, the first limiting piece and the second limiting piece are both fixed relative to the worm, the first limiting piece abuts against the inner side wall of the box body, and the second limiting piece abuts against the outer side of the box body. The situation that in the rotating reversing process of the speed reducer, the worm axially moves under the action of the rotating inertia force of the worm gear, and then collision abnormal sound is caused is effectively reduced, the running stability and reliability of the speed reducer are guaranteed, and the service life is prolonged.

Description

technical field [0001] The present application relates to the field of geared motors, in particular to a DC brushed geared motor. Background technique [0002] The electric power steering system is based on the ECU controller to control the rotation of the EPS motor according to the changes of the sensor torque signal and angle signal collected, and the EPS motor drives the worm gear-worm reduction mechanism to provide the assistance required for the vehicle steering, thereby improving the steering performance of the vehicle. . That is, the EPS steering system is used to improve the motion stability of the vehicle by utilizing the power of a separate EPS motor to assist the steering of the vehicle. Traditionally, the auxiliary steering device used hydraulic pressure, but recently, from the viewpoints of reducing engine load, reducing weight, improving steering stability, and quick restoring force, the use of gears adapted to transmit the rotational output of the motor via a...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned related technologies, the inventor believes that during the reversing process of the reducer of the related electric power steering system, when the EPS motor stops providing driving force to the worm, the worm gear will exert a force on the worm under the action of rotational inertia along the axial direction of the worm. Under the action of inertial force, the worm will drive the rotor of the EPS motor to move axially, and there will be abnormal collisions with the motor casing, etc., which will affect the service life of the reducer

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