LINEAR MOTION MECHANISM, GOVERNING VALVE DRIVE DEVICE, AND STEAM TURBINE

摘要

A linear motion mechanism (27) is provided with: a cylinder rod (312) into which a ball screw (30) can be inserted, said cylinder rod (312) comprising a base end section that is connected to a nut (311) within a piston casing (36) and a tip section (312a) that is exposed on the outside of the piston casing (36); a nut-side grease supply hole (321) that is formed in the nut (311) and that comprises a discharge port (323) that opens toward the outer circumferential surface of the ball screw (30); and a cylinder rod-side grease supply hole (322) that is formed in the cylinder rod (312), that comprises on one end thereof an inlet (324) that opens at a position that is exposed to the outer section of the piston casing (36), and that comprises another end (322b) that is connected to the nut-side grease supply hole (321).

主权项

1. A linear motion mechanism, comprising:
an electric motor; a ball screw which is rotationally driven around an axis by the electric motor; a nut which is screwed into the ball screw, and advances and retreats relative to the ball screw in an axial direction of the ball screw according to rotation of the ball screw; a casing which surrounds the ball screw and the nut; a tubular cylinder rod which includes a base end section which is connected to the nut inside the casing and a tip section which is exposed to the outside of the casing, and into which the ball screw can be inserted; a nut-side grease supply hole which is formed in the nut and includes a discharge port which opens toward an outer circumferential surface of the ball screw; and a cylinder rod-side grease supply hole which is formed in the cylinder rod, and includes an inlet which opens at a position exposed to the outside of the casing on one end of the cylinder rod-side grease supply hole, and the other end thereof which communicates with the nut-side grease supply hole.