Structure for supporting a sleeve member in automatic transmission

1. A sleeve supporting structure for an automatic transmission, the automatic transmission including an input shaft, a motor and an oil pump with an inner gear which are disposed adjacent to each other in an axial direction of the input shaft, the sleeve supporting structure comprising:

a sleeve member that is disposed on a radial outside of the input shaft, the sleeve member is configured to transmit rotation of the input shaft to the inner gear of the oil pump,

a rotational shaft portion that is disposed in the motor;

an oil pump housing that accommodates the inner gear; and

a stationary member that supports an outer circumferential surface of the rotational shaft portion, the stationary member including a projection that projects toward a side of the oil pump,

wherein the sleeve member has one axial end portion that is overlapped with the rotational shaft portion in a radial direction of the sleeve member and an opposite axial end portion that is in meshing engagement with the inner gear, and the sleeve member is supported by an inner circumferential surface of the oil pump housing and an inner circumferential surface of the rotational shaft portion, and

wherein the projection of the stationary member is fitted onto an outer circumferential surface of the oil pump housing so as to form a faucet joint in cooperation with the oil pump housing.

2. The sleeve supporting structure as claimed in claim 1 , wherein the stationary member includes a support portion that supports the outer circumferential surface of the rotational shaft portion and a reduced thickness portion that extends from the support portion to a tip end portion of the projection which is fitted onto the outer circumferential surface of the oil pump housing, the reduced thickness portion being bulged so as to be elastically deformable.

3. The sleeve supporting structure as claimed in claim 1 , wherein the rotational shaft portion comprises a radial extension that extends in a radially inward direction of the rotational shaft portion, the sleeve member being supported by an inner circumferential surface of the radial extension.

4. The sleeve supporting structure as claimed in claim 2 , wherein the rotational shaft portion comprises an axial extension that extends toward a side of the oil pump in an axial direction of the rotational shaft portion, an outer circumferential surface of the axial extension being supported by the support portion of the stationary member.

5. The sleeve supporting structure as claimed in claim 2 , wherein the reduced thickness portion of the stationary member is bulged in such a direction as to be apart from the oil pump housing.

6. The sleeve supporting structure as claimed in claim 2 , wherein the reduced thickness portion of the stationary member extends from the support portion in a radially outward direction of the input shaft and is bent at a bend in such a direction as to be apart from the motor.

7. The sleeve supporting structure as claimed in claim 3 , wherein the radial extension of the rotational shaft portion is fitted onto an outer circumferential surface of the sleeve member so as to form a faucet joint in cooperation with the sleeve member.

8. The sleeve supporting structure as claimed in claim 3 , wherein the sleeve member includes a reduced diameter portion that is located on a side of an axial end of the sleeve member, the reduced diameter portion being supported by the inner circumferential surface of the radial extension of the rotational shaft portion.