Patent ID: 8240448
Filing Date: 2012-08-14
Classification: B60T,F16D,F16H,Y10T

Abstract:
1. A parking device of a transmission, comprising: a parking gear provided in a transmission case at a rotational axis which rotates together with a wheel axel; a parking pole provided in the transmission case so as to swing, the parking pole having a pawl portion which locks the parking gear through an engagement therebetween; a parking rod provided in the transmission case so as to move together with an operation of a shift lever, the parking rod having a cam portion which presses the parking pole so as to make the engagement between the pawl portion of the parking pole and the parking gear according to the operation of the shift lever; a support member provided in the transmission case beside the cam portion of the parking rod on an opposite side to the parking pole so as to be held at the transmission case, the support member receiving a reaction force which acts on the cam portion which occurs in case of pressing of the cam portion against the parking pole; and a concave holding portion formed at the transmission case so as to hold the support member, wherein the support member comprises a first cylindrical outer face having a curvature of a first radius which is positioned on the side of said concave holding portion so as to contact and slide along a concave inner face of said concave holding portion in a specified range of a rotational direction and a second cylindrical outer face having a curvature of a second radius which is positioned on the side of said cam portion of the parking rod so as to contact and slide on a surface of the cam portion, the curvature of the first radius of said first cylindrical outer face having a center which is located at the same position as that of the curvature of the second radius of said second cylindrical outer face, the second radius being smaller than the first radius.