| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hydraulic system of simple and inexpensive structure capable of restricting stagnation of hydraulic oil inside a casing of an automatic transmission. Ž<P>SOLUTION: The oil stored in an oil pan 50 is sent to an oil passage 84 by an oil pump 220, and thereafter, returned to the oil pan 50. The oil pump 60 is driven by rotational energy from a rotor 70 to be rotated by receiving the travelling wind generated during the travelling of a vehicle, and discharges the oil stagnating in a gap formed between a case 40 and a friction engagement device 200. Since discharging ability of the oil pump 60 is automatically adjusted in response to the wind speed of the travelling wind, stagnation of the oil inside the case 40 can be effectively restricted, and a control circuit for controlling the amount of the discharged oil becomes unnecessary. As a result, deterioration of the energy efficiency of the vehicle, and an increase in size, complication and cost increase of a transmission 100 can be restricted. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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