| 摘要 |
PURPOSE:To decrease a discharge rate at a given running speed or more by diminishing a throttle opening undergoing power due to centrifugal force, which is caused by a rotational drive of a drive shaft. CONSTITUTION:Action force caused by centrifugal force caused by rotational drive of a drive shaft 5 is applied to the valve body 19 of a variable throttle valve 17, until the rotational speed of the drive shaft 5 reaches a preset rotational speed, however discharge rate is increased proportionally to an increase in the rotational speed because of unchanged throttle opening. After the rotational speed of the drive shaft 5 reaches to a preset rotational speed, the variable throttle valve 17 diminishes its opening with the valve body 19 moved by action force due to centrifugal force which is caused by the rotational drive of the drive shaft 5, so as to increase the difference between the front and the rear pressures of the variable throttle valve 17 due to its diminished opening to move a operative piston 12 for displacing a discharge rate changing member 10 in a direction for decreasing the discharge rate. |
