| 摘要 |
PURPOSE:To reduce the loss of an oil pump by obtaining the characteristics in the variation of the pushing force for the variation of negative pressure by controlling a throttle valve by combining two diaphragms in reverse operation. CONSTITUTION:The first diaphragm 18 in which the pushing force towards a throttle valve 12 side reduces are the suction-pipe negative-pressure increases and the first rod 46 arranged between the first diaphragm 18 and the spool of the throttle valve 12 are arranged. The second diaphragm 20 in which the pushing force towards the throttle valve 12 side as the suction-pipe negative- pressure increases and the second rod 48 set between the second diaphragm 20 and the spool of the throttle valve 12 are arranged. Further, in the first diaphragm 18, a force acts onto a spool only when the negative pressure is at the first prescribed value or less, and in the second diaphragm 20, a power acts onto the spool when the negative pressure is at the second prescribed value or more. With such constitution, the loss of an oil pump can be reduced. |
