| 摘要 |
PURPOSE:To maintain a stable driving state even at time of trouble happening, by installing a hydraulic pressure generator, increasing discharge pressure according to an increase in engine speed, and displacing valve action timing to the state suited to a high-speed drive in the state that the discharge pressure is more than the specified value. CONSTITUTION:At medium and low speed ranges of an engine, hydraulic pressure is not fed to a hydraulic fluid supply passage 30 due to excitation of a solenoid valve 43, and each of pistons 25 and 26 is matched to the inside of each of guide holes 17 and 20 by energizing force of a coil spring 28, so that respective rocker arms 5-7 are possible for their relative angle displacement with one another. At this time, if nonconformity occurs in a control circuit 45 and the solenoid valve 43 or the like, the solenoid valve 43 is demagnetized and a hydraulic fluid flows in the inside of the passage 30, but discharge pressure of a pump 40 will not go up till it overcomes the energizing force of the coil spring 28, so that these pistons 25 and 26 maintain the state conformed to a low speed range. Therefore, even when something nonconform ity occurs in an electric system, a selector is operated to the stable side, thus reliability in this device is improvable.
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