ELECTRICALLY-DRIVEN BRAKING DEVICE OF VEHICLE

摘要

PROBLEM TO BE SOLVED: To provide a rotation and linear motion conversion mechanism (screw member) of an electrically-driven braking device of a vehicle that can be maintained at a sufficient lubrication state for a long period.SOLUTION: A rotary motion of a shaft member SFT rotary-driven by an electric motor is converted to a linear motion of a pressing member PSN by a screw member NJB. The pressing member PSN has a first cylinder part Et1 on its inner periphery. The shaft member SFT has a second cylinder part Et2 overlapped with the first cylinder part Et1 in an axial direction on its outer periphery, and a third cylinder part Et3 on its inner periphery. The screw member NJB is arranged inside the third cylinder part. A storage chamber Hch is blocked by the first cylinder part Et1 and the second cylinder part Et2. The storage chamber Hch is connected to one end Pb2 of the screw member NJB, and inside of the storage chamber Hch is filled with a lubricant GRS for lubricating the screw member NJB.