| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the mechanical efficiency of an automatic transmission 1 by reducing a drag resistance of a friction engagement device (C1, C2, B1 to B3, etc.) in the automatic transmission 1 for changing a shift mechanism 3 by engaging/disengaging the hydraulic friction engagement device (C1, C2, B1 to B3, etc.). Ž<P>SOLUTION: The automatic transmission includes an oil discharging means 10 for sucking and discharging oil in the friction engagement device (C1, C2, B1 to B3, etc.) by a negative pressure occurring in a torque converter housing 8. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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