A static self-locking device for an electric motor and an electric motor

Abstract

The present invention belongs to the technical field of motors, and specifically discloses a static self-locking device for a motor, which includes a machine cover and a self-locking component. Among them, the machine cover is arranged at one end of the motor body, and the drive shaft of the motor body is rotationally and coaxially matched with the machine cover; the self-locking component is used for self-locking the drive shaft after the motor body is powered off. The self-locking component includes a friction member that cooperates with the drive shaft and an elastic member that is used to keep the friction member in contact with the drive shaft. The frictional force between the friction member and the drive shaft is greater than or equal to the torque of the drive shaft after the motor body is powered off. With the motor static self-locking device designed with such a structure, when the motor body is powered off, the drive shaft will quickly stop rotating under the resistance of the friction member, and the structure is simple and the cost is low. The present invention also provides a motor, which has a low cost, is easy to assemble, and can stably achieve self-locking of the drive shaft after the motor body is powered off.

Claims

1. A static self-locking device for an electric motor, characterized in that, it comprises: a machine cover (11) arranged at one end of the electric motor body (12), and the drive shaft (13) of the electric motor body (12) is rotationally and coaxially fitted with the machine cover (11); a self-locking component (2) for self-locking the drive shaft (13) after the electric motor body (12) is powered off. The self-locking component (2) includes a friction member (21) cooperating with the drive shaft (13), and an elastic member (22) for keeping the friction member (21) in contact with the drive shaft (13). The frictional force between the friction member (21) and the drive shaft (13) is greater than or equal to the torque of the drive shaft (13) after the electric motor body (12) is powered off; the elastic member (22) is arranged as a double-wound constant force spring, and both ends of the elastic member (22) are provided with coil springs (221), and the friction member (21) is fastened to the middle of the elastic member (22); a fixing seat (4) for mounting the elastic member (22) is arranged on the inner side wall of the machine cover (11), and the fixing seat (4) is fastened to the machine cover (11) through a screw (5); the fixing seat (4) includes a base (42) and a fixing shaft (43) integrally provided with the base (42); the coil spring (221) at the end of the elastic member (22) is sleeved on the fixing shaft (43), the outer diameter of the fixing shaft (43) is smaller than the outer diameter of the base (42), and the coil spring (221) is pressed on the base (42) by the end cover of the screw (5).

2. The static self-locking device for an electric motor according to claim 1, characterized in that, oil grooves (213) are evenly distributed on one side surface of the friction member (21) in contact with the drive shaft (13).

3. The static self-locking device for an electric motor according to claim 1, characterized in that, a through hole (44) is coaxially provided through the fixing shaft (43) and the base (42), and the screw (5) passes through the through hole (44) and is fastened to the machine cover (11) through a nut (6).

4. The static self-locking device for an electric motor according to claim 1, characterized in that, a friction member mounting position (222) is integrally bent at the middle of the elastic member (22), and the friction member mounting position (222) is arranged in a C shape.

5. The static self-locking device for an electric motor according to claim 4, characterized in that, a positioning groove (211) is recessed on one side wall of the friction member (21) away from the drive shaft (13), and a positioning post (212) protrudes in the positioning groove (211).

6. The static self-locking device for an electric motor according to claim 5, characterized in that, the positioning groove (211) is clamped on the friction member mounting position (222), and the positioning post (212) is matched with a positioning hole formed in the friction member mounting position (222).

7. An electric motor, characterized in that, it includes the static self-locking device for an electric motor according to any one of claims 1 to 6.

Images