RELIEF VALVE FOR OIL PUMP

摘要

PURPOSE: A relief valve for an oil pump is provided to prevent damages of a main gallery by lowering a peak pressure value through a fast flow of a bypass. CONSTITUTION: A relief valve for an oil pump comprises a plunger(2), a coil spring(7), and a locator(8). The plunger divides a relief space of an oil pump into a housing chamber and a plunger chamber. The housing chamber is connected to a main gallery. The plunger chamber is connected to an outlet port of the oil pump discharging oil to a main gallery. The plunger chamber bypasses a part of the oil discharged to the main gallery. The coil spring has elasticity modulus compressed in the oil pressure of the main gallery, which is relatively lower than a warm-up state of an engine. The coil spring supports the plunger. The locator supports the coil spring in order that the elasticity modulus is variable by a change of a bearing surface of the coil spring.