Patent ID: 7559867
Filing Date: 2009-07-14
Classification: F16D,F16H

Abstract:
1. A connection structure for an automatic transmission, comprising: a drum member that includes a base portion, an outer diameter portion that extends from an outer diameter side of the base portion in an axial direction, and a collar portion that extends from an inner diameter side of the base portion at a first end of the collar portion in the axial direction; a base member that includes a raised portion, an outer diameter portion that extends from an outer diameter side of the raised portion in the axial direction, a boss portion that extends from an inner diameter side of the raised portion in the axial direction, and a connection portion that extends from a first end of the outer diameter portion; and a ring gear of a planetary gear that includes a spline groove and a circular concave groove on an end portion of an inner peripheral face, wherein: a circular portion, including the circular concave groove, of the ring gear has a notch portion in at least one position along a periphery thereof, the snap ring includes tabs extending toward an outer diameter direction on both end portions thereof, and the tabs are positioned in the notch portion and tabs are manipulated from an outer diameter direction of the notch portion such that the snap ring can be engaged and disengaged from the circular concave groove.