To provide a hydraulic actuator device for an automatic transmission arranged with first projections and second projections on the same diameter so that at least one of the first projections and one of the second projections are not coupled with each other and capable of being made compact in the radial direction.
A plurality of the first projections 21 are protruded toward the cylinder face 30a of a sleeve 30 on a first clutch drum 20 to secure a pressure receiving area and a gap in a hydraulic chamber 42 between the sleeve 30 and the first clutch drum 20. A plurality of the second projections 11 are protruded toward the cylinder face 20a of the first clutch drum 20 on a second clutch drum 10 to secure a pressure receiving area and a gap in a hydraulic chamber 41 between the first clutch drum 20 and the second clutch drum 10. The first projections 21 and the second projections 11 are arranged on the same diameter so that at least one of the first projections 21 and one of the second projections 11 are not coupled with each other.
OKUMURA TAKAYUKI
NOZAKI KAZUTOSHI
KANEDA TOSHIKI
KASHIWABARA YUJI
TOYOTA MOTOR CORP