Patent ID: 8297426
Filing Date: 2012-10-30
Classification: F16D,F16H

Abstract:
1. A piston apparatus of an automatic transmission including a cylindrical actuating member capable of moving in an axial direction of a rotation shaft of the automatic transmission, and a hydraulic chamber, and configured so that the actuating member moves in the axial direction due to pressure in the hydraulic chamber, the actuating member including a cylinder part that extends in the axial direction and to which pressure in the hydraulic chamber is transmitted, a pressing part that extends in a radial direction and presses against a friction engaging element of the automatic transmission, and a connecting part that connects the cylinder part and the pressing part and, with respect to the axial direction, is offset from the pressing part in a direction of separation from the friction engaging element, and an axial direction offset amount of the connecting part from the pressing part being set larger than a stroke amount of the actuating member, wherein the stroke amount of the actuating member is an axial direction distance that the actuating member can move between a released state and an engaged state of the friction engaging element.