| 摘要 |
An electric linear actuator has a housing, an electric motor, a speed reduction mechanism, and a ball screw mechanism. The ball screw mechanism has a nut and a screw shaft. The nut is rotationally supported by bearings on the housing but is axially immovable. The screw shaft is rotationally supported on the nut and is axially movable with respect to the housing. The housing has a first housing and a second housing abutting against one another. Bores contain the screw shaft in the housing. The speed reduction mechanism has an input gear, an intermediate gear, and an output gear, secured on the nut, mating with the intermediate gear. The intermediate gear is rotationally supported, via a bearing, on a shaft. The shaft is supported at its opposite ends on the first and second housings. |
| 主权项 |
1. An electric linear actuator comprising:
a housing; an electric motor mounted on the housing; a speed reduction mechanism transmitting the rotational power of the electric motor to a ball screw mechanism, via a motor shaft, while reducing motor speed; the ball screw mechanism converting the rotational motion of the electric motor, transmitted via the speed reduction mechanism, to an axial linear motion of a drive shaft; the ball screw mechanism comprising a nut and a screw shaft, the nut has a helical screw groove on its inner circumference, the nut is rotationally supported by bearings on the housing, the nut is axially immovable with respect to the housing, the screw shaft is coaxially integrated with the drive shaft, the screw shaft has a helical screw groove on its outer circumference that corresponds to helical screw groove of the nut, the screw shaft is inserted into the nut, via a large number of balls, the screw shaft is axially movably supported on the housing, the screw shaft is non-rotatably supported with respect to the housing; the housing comprises a first housing and a second housing, the second housing is arranged with its end face abutting against an end face of the first housing, the electric motor is mounted on the first housing, bores formed in the first and second housings, respectively, containing the screw shaft; the speed reduction mechanism comprises an input gear secured on the motor shaft, an intermediate gear mating with the input gear, and an output gear, secured on the nut, mating with the intermediate gear; the intermediate gear is rotationally supported, via a bearing, on a shaft, the shaft is supported at its opposite ends on the first and second housings; and ring-shaped washers are arranged at either side of the intermediate gear, a face width of gear teeth of the intermediate gear is formed smaller than the whole axial width of the intermediate gear. |
