| 摘要 |
An oil pump capable of supplying a required amount of oil in response to engine rotational speed even at low temperatures is configured at low cost. The oil pump is provided with a capacity adjustment mechanism that changes the pump capacity by moving a tubular body in a tube radial direction, with a pump chamber being formed between the tubular body and an outer circumference side of a rotor, a first spring that biases the tubular body in a direction in which pump capacity increases, a control valve that converts oil pressure of the oil pump into control pressure and causes the control pressure to act on the capacity adjustment mechanism, and a second spring that biases a valve body in order to set the control pressure in the control valve. The relationship of the biasing forces of the first spring and the second spring is set so that the pump capacity is set to maximum when the engine rotational speed is less than a predetermined value, and so that the pump capacity is reduced when the engine rotational speed exceeds a predetermined value. |
