HIGH-PRESSURE FUEL SUPPLY PUMP INCLUDING AN ELECTROMAGNETICALLY DRIVEN INTAKE VALVE

摘要

A high-pressure fuel supply pump including an electromagnetically driven intake valve is configured such that a pressure equalizing hole is provided in the valve stopper positioned between the valve and a pressurizing chamber. The pressure equalization hole connects a spring storage space, provided between a valve and a valve stopper, with a surrounding fluid passage. The high-pressure fuel supply pump is further configured such that an opening of the pressure equalizing hole at the spring storage chamber side is open at a position at the inner side of a diameter of the spring. Since the pressure in the pressurizing chamber can be introduced into the inner side of the spring without traversing the spring, the unstable behavior of the spring or the valve due to the introduced pressure eliminated. Since the force applied to the valve when the valve closes is stabilized, the closing timing of the valve is stable.

主权项

1. A high-pressure fuel supply pump including an electromagnetically driven intake valve, comprising:
a pump housing including a pressurizing chamber; a piston plunger supported on the pump housing, the piston plunger repeating reciprocating in the pressurizing chamber in order to take fluid into the pressurizing chamber and discharge the fluid from the pressurizing chamber after the fluid is pressurized; and an intake valve operated by an electromagnetically driven plunger rod attached to the pump housing, the intake valve including
a valve seat and a valve that opens and closes a fuel introduction passage provided at an entrance of the pressurizing chamber,a valve stopper provided between the valve and the pressurizing chamber, the valve stopper restricting an open position of the valve, anda spring storage space provided between the valve stopper and the valve, the spring storage space storing a spring which biases the valve in a closing direction, the spring storage space being a substantially closed space isolated from a surrounding fuel passage when the valve is in an open state; wherein a pressure equalizing hole is provided in the valve stopper, the pressure equalizing hole being configured to have an opening thereof on a side of the spring storage space, the opening being located on an inner side of a diameter of the spring.