초록 ▼

The objective of the present invention is to dampen operating sounds of an electromagnetic drive mechanism used for a variable displacement to reduce an individual difference depending on apparatus due to the control mechanism in a high-pressure fuel supply pump change over time or installation tole

The objective of the present invention is to dampen operating sounds of an electromagnetic drive mechanism used for a variable displacement to reduce an individual difference depending on apparatus due to the control mechanism in a high-pressure fuel supply pump change over time or installation tolerance. To achieve the above objective, the present invention is configured such that before the electromagnetic drive mechanism supplies a drive force to a plunger which is electromagnetically driven by the electromagnetic drive mechanism, another displacement force situates the plunger in a specific position. When compared to an occasion where the plunger is displaced all strokes by a magnetic biasing force, the above configuration is able to reduce the force of impact on a member (for example, valve body) mounted to the plunger and a restricting member, thereby damping the collision noise. Furthermore, since an extra member, such as a damping member, is not required, individual difference depending on apparatus do not easily occur.

대표청구항 ▼

What is claimed is: 1. A high-pressure fuel supply pump, comprising: a body of a high-pressure fuel supply pump, a pressure chamber formed in the body of the supply pump, a fuel intake port for intaking fuel, a fuel discharge port provided in the body of the supply pump for discharging the fuel fro

What is claimed is: 1. A high-pressure fuel supply pump, comprising: a body of a high-pressure fuel supply pump, a pressure chamber formed in the body of the supply pump, a fuel intake port for intaking fuel, a fuel discharge port provided in the body of the supply pump for discharging the fuel from the pressure chamber, an intake channel provided in the body of the supply pump for intaking the fuel to the pressure chamber from the fuel intake port, a discharge channel provided in the body of the supply pump for delivering the fuel from the pressure chamber, a discharge valve provided in the discharge channel for discharging the fuel from the pressure chamber to the fuel discharge port, a plunger disposed in the body of the supply pump and reciprocates in the pressure chamber for drawing and discharging the fuel, a pressure pulsation damping mechanism provided inside of the intake channel between the fuel intake port and the pressure chamber for damping pressure pulsation of the fuel generated in the intake channel, a damper cover provided on the body of the supply pump, the damper cover containing said pressure pulsation damping mechanism and said fuel intake port, the high-pressure fuel supply pump further comprising: an intake valve provided at a fluid intake port of the pressure chamber in the intake channel at the down streamside of the pressure pulsation damping mechanism, and an electromagnetic drive mechanism for driving the intake valve electromagnetically to open or close the fluid intake port of the pressure chamber and controlling an amount of the fuel discharged from the pressure chamber through the discharge valve, wherein the electromagnetic drive mechanism is provided in a penetration hole, an end of which is opened on a side surface of the body of the supply pump and an other end of which is opened to the pressure chamber, and a flow passage is formed from an outer surface of the body of the supply pump covered with the dumper cover to the inside of the body along an axis of the plunger disposed in the pressure chamber, and the flow passage is connected with the penetration hole at an upstream of an inlet of the pressure chamber and also at an upstream of the intake valve. 2. The high-pressure fuel supply pump according to claim 1, wherein: the fuel flown from the fuel intake port and the fuel flown return from the intake valve enable to flow into the intake channel provided with the pressure pulsation damping mechanism therein, whereby the pressure pulsation of the fuel generated in the intake channel is damped by the pressure pulsation damping mechanism. 3. The high-pressure fuel supply pump according to claim 1, wherein: the fuel flown from the fuel intake port and the fuel flown return from the intake valve enable to flow into the intake channel provided with the pressure pulsation of the fuel generated in the intake channel is damped by the pressure pulsation damping mechanism. 4. The high-pressure fuel supply pump according to claim 1, further comprising: a restricting member for restricting a displacement of the intake valve by an opening operation at a certain position, and a biasing member for biasing the intake valve in the direction of closing the valve, wherein when the electromagnetic drive mechanism is turned off, the intake valve is displaced in the direction of opening the valve due to a fluid differential pressure between an intake channel side pressure and a pressure chamber side pressure of the intake valve.