| 摘要 |
An electromechanical actuator for use in a hydraulic braking circuit of a vehicle comprises an electric motor having a stator and a rotor, and a linear actuator that is located within the motor. The stator is located within a housing having a first end and a second end and the rotor is located inside the housing and comprises an elongate rotor body having a bore passing from one end of the body to the other, the bore being enlarged over a first portion of the body located towards the first end of the motor, and being of reduced size over a second portion of the body located towards the second end of the motor. The linear actuator comprises an elongate shaft that is located within the bore in the elongate rotor body, the shaft having a screw part at one end carrying an external thread that extends along a portion of the shaft that is located within the enlarged portion of the bore in the rotor body, and a fixing part at the other end shaft that is a tightly located into the bore of the second portion of the elongate body to prevent radial movement of the shaft relative to the elongate body, the linear actuator further comprising a drive nut that surrounds the screw part of the shaft and is located at least in a retracted position inside the enlarged bore of the first portion of the rotor body, the drive nut having an internal thread and being connected to the screw part through a set of balls that engage the threads of the drive nut and screw part, and the fixing part of the shaft includes a tapering portion that engages a complimentary tapering portion of the bore in the second portion of the rotor body.A locking nut engages with one end of the rotor body and engages a bearing assembly secured to the stator. |
