| 摘要 |
A drain path extending from a control valve mounted upper an oil pump is designed to make unit sizes small. The drain path is formed using a groove on a joint surface where an oil pump housing is secured to a transmission case. The drain path is formed without any extension around a bearing holding portion for a counter shaft while it overlaps the bearing holding portion as seen in the axial direction. Thus, the whole structure of an automatic transmission can be designed in smaller dimensions. A supply hole is formed in the bearing holding portion so as to allow hydraulic oil drained from the drain path to be delivered to the transmission. The bearing holding portion may be dislocated to another position corresponding to design change for a counter shaft.
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