| 摘要 |
<P>PROBLEM TO BE SOLVED: To secure the stability of initial variable speed performance of an automatic transmission. Ž<P>SOLUTION: A working fluid is filled in the inside of a working fluid chamber 312 and the inside of an oil passage 313 by sending the working fluid from a working fluid tank 402 into the inside of the working fluid chamber 312 and the inside of the oil passage 313 in such a state that pressures in the inside of the working fluid chamber 312 and the inside of the oil passage 313 are reduced into negative pressures using a vacuum pump 401 before incorporating a valve body to a case 10. Thus, the stability of initial variable speed performance of the automatic transmission can be secured because air is prevented from being mixed into a hydraulic circuit composed by the working fluid chamber 312 and the oil passage 313 by filling the working fluid in such a state that pressures in the inside of the working fluid chamber 312 and the inside of the oil passage 313 are reduced into negative pressures. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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