| 摘要 |
PURPOSE:To prevent a wrong signal from being generated during actuation by positioning the vacuum chamber of a sensor so that the vertical distance between the lower end surface of the vacuum chamber and a specific level position of the lubricant oil in a crank chamber is the value obtained by dividing the mean pressure difference between both chambers by oil concentration. CONSTITUTION:The mean pressure PC0 in the crank chamber 18 is negative during operation because of the influence of a leaf valve an the instantaneous value PC1 varies like a sine wave, but when the lubricant oil 20 is above a sepcific level L0, the pressure PC1 does not reach the vacuum chamber 15 of the oil sensor 16, which does not operate. Consequently, a signal which indicates that the oil falls below the level L0 is not generated. When, however, the sensor 16 is fitted newly, the pressure in the chamber 5 is held at the atmospheric pressure and above the pressure PC1, so air flows out of the chamber 18 and its mean pressure PV0 drops below the pressure PC0 to allow the oil 20 to move up in a pipe 2; the height (h) of the chamber 5 is made larger than the value obtained by dividing the difference between the pressure PV0 and pressure PC0 by the oil concentration to prevent the oil 20 from reaching the chamber 5. |
