Patent ID: 8069743
Filing Date: 2011-12-06
Classification: F16H,Y10T

Abstract:
1. A shift operation device of an automatic transmission, the shift operation device comprising: a shift operation member including: a plurality of shift rail members, each of which includes: wherein an engagement portion of the shift lug portion which is engaged with the arm portion includes a pair of columnar projections arranged at positions mutually different in the shift direction and in the select direction, one of the columnar projections includes a one-side pressure receiving surface for receiving a one-direction pressing force in one direction of the shift direction from the arm portion, the other of the columnar projections includes an other-side pressure receiving surface for receiving an opposite-direction pressing force in a direction opposite to the one-direction pressing force from the arm portion, when the shift lug portion is retained in a neutral position, the one-side pressure receiving surface and the other-side pressure receiving surface are approximately positioned on a reference orthogonal surface which is superimposed on the center axis of the shaft portion and which is orthogonal to the rail portion, and the arm portion is rotated around the center axis from the set-back position to apply the one-direction processing force to the one-side pressure receiving surface, thereby shift-actuating the shift fork portion in one direction and the arm portion is rotated reversely around the center axis from the set-back position to apply the other-direction pressing force to the other-side pressure receiving surface, thereby shift-actuating the shift fork portion in the other direction.