LINEAR ACTUATOR AND ROCKING CONTROL DEVICE FOR RAILWAY VEHICLE

摘要

Provided are: a compact linear actuator configured in such a manner that a back drive force generated in the linear actuator is small and the linear actuator is less likely to be seized due to powder caused by wear; and a rocking control device adapted for use in a railway vehicle and having the linear actuator. A linear actuator comprises: a body having a hollow structure, the body having an open end section and a closed end section; a cylinder affixed to the closed end section side, which is located within the body, and having an open end located on the open end section side; a linear motion rod contained within the cylinder so as to be slidable in the axial direction, the linear motion rod having one end section extended from the open end section of the body and having a wear ring provided to the outer periphery of the other end section of the linear motion rod; and a hollow shaft rotatably supported within the body. The hollow shaft has a permanent magnet provided to a part of the outer peripheral surface thereof. A winding wire section provided to a part of the inner surface of the body and the permanent magnet form a hollow motor. A nut section which is affixed coaxially to the hollow shaft and a screw thread section which is located on the outer peripheral surface of the linear motion rod engage with each other to form a rotation/linear motion conversion mechanism. Rotation oil seal sections seal between the hollow shaft and the body at opposite ends axially of the nut section.