Patent ID: 7694605
Filing Date: 2010-04-13
Classification: F16H,Y10T

Abstract:
1. A gear change control system of an automatic transmission, comprising: a shift member, including a shaft portion disposed in such a manner that a selection axis thereof is oriented in a selecting direction, and including an arm portion formed on the shaft portion in such a manner as to project radially therefrom; shift fork portions, operable to make gear shifts of gears within a change-speed gear section; a plurality of shift rail members, connected to the shift fork portions, and arranged in such a manner that shift axes thereof are oriented in a shifting direction; and shift lug members, projecting from the shift rail members, and being capable of facing the arm portion, wherein the arm portion of the shift member moves for selection and gear shifting and presses against the selected shift lug member, so that a gear shift to a target gear is attained by the shift fork portion which is linked with the shift lug member so pressed against, wherein, each of the shift lug members include only a single pillar-shaped portion, and the arm portion is provided as a member rotating about the selection axis in a position where the arm portion faces a selected shift lug member, and the arm portion moves for selection in a direction of the selection axis to select the single pillar-shaped portion of the selected the shift lug member and then swings about the selection axis to apply a pressure in the shifting direction against a second side surface of the single pillar-shaped portion of the selected shift lug member to cause the shift fork portion of the shift rail member linked with the selected shift lug member to perform a shift withdrawing operation, and wherein, the single pillar-shaped portion of the shift lug member projects from the shift rail member substantially perpendicularly relative to the shifting direction, and the single pillar-shaped portion of the shift lug member is provided in such a manner that a center axis in the projecting direction of the single pillar-shaped portion of the shift lug member intersects the selection axis which is a rotational axis of the arm portion when the shift fork portion of the shift rail member is in a neutral state.