| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hydraulic control device for an automatic transmission that can improve the responsiveness and controllability of the automatic transmission while maintaining the operating efficiency thereof. <P>SOLUTION: The hydraulic control device for an automatic transmission 1 includes: a hydraulic pressure chamber 5 which hydraulic pressure is supplied to and exhausted from, and is coupled with a rotator 4; a hydraulic pressure supply valve 7 for supplying hydraulic pressure to the hydraulic pressure chamber 5 from a hydraulic pressure source 11; a hydraulic pressure exhaust valve 8 for exhausting hydraulic pressure therefrom; and a hydraulic pressure circulation path 9 extending from the hydraulic pressure source 11 to the hydraulic pressure chamber 5, and which is configured to be firmly sealed from an external air while the hydraulic pressure exhaust valve 8 is closed. The hydraulic control device is provided with: an oil path provided along the rotational center of the hydraulic pressure chamber 5, and for supplying and exhausting hydraulic pressure to and from the hydraulic pressure chamber 5; an exhaust passage 9a communicated with the oil path 6 and provided above the axial center of the oil path 6 for air vent; and an air vent 12 for exhausting the air in hydraulic pressure from the exhaust passage 9a to the outside. <P>COPYRIGHT: (C)2012,JPO&INPIT |
