Patent ID: 7731007
Filing Date: 2010-06-08
Classification: F16H,Y10T

Abstract:
1. A parking lock mechanism of an automatic transmission, comprising: a casing; a parking gear provided within said casing; a parking pawl pivotally mounted in said casing at a pivot support portion such that the parking pawl pivots in an engagement plane, the parking pawl including an engagement portion that engages with said parking gear to achieve a parking lock state; and a parking pawl holding portion that suppresses movement of said parking pawl in a direction perpendicular to said engagement plane; wherein said parking pawl holding portion includes opposing side surfaces of a groove portion of the casing, a base member separately provided from the casing, and a protruding portion of a sleeve member, wherein said pivot support portion pivotally supports said parking pawl with respect to said casing and said base member, wherein said base member is provided at a position distant from said pivot support portion and distant from said protruding portion of the sleeve member, such that the base member extends from the casing substantially parallel to the engagement plane in a direction towards the engagement portion, wherein said opposing side surfaces, said base member, and said protruding portion suppress said movement of said parking pawl in said direction perpendicular to said engagement plane when said parking lock mechanism is not in said parking lock state, and wherein said base member and said protruding portion suppress said movement of said parking pawl in said direction perpendicular to said engagement plane when said parking lock mechanism is in said parking lock state.