Patent ID: 8740579
Filing Date: 2014-06-03
Classification: F02M,Y10T

Abstract:
1. A high-pressure fuel supply pump comprising: a pressurizing chamber whose volume is varied by reciprocation of a plunger; a discharge port adapted to discharge fuel pressurized by the pressurizing chamber; and a discharge valve being a non-return valve provided between the discharge port and the pressurizing chamber, the discharge valve including: a valve body housing formed with a plurality of discharge ports communicating with the discharge port; a valve body accommodated in the valve body housing and biased in a direction of closing the valve by means of a discharge valve spring; and a seat member accommodated in the valve body housing and having a seat portion adapted to come into contact with the valve body for closing the valve, wherein the discharge valve is a flat valve in which a plane of a valve seat formed on the valve body and a plane of the seat portion are parallel to a plane perpendicular to an axial direction of the valve body, wherein, when the valve is opened, a flow of fuel moving from the pressurizing chamber through a hollow portion of the seat member and axially colliding with the valve body is radially distributed in a radial direction of the valve body to become a flow directly moving towards the discharge ports and a flow colliding with an inner wall of the valve body housing before moving toward the discharge ports and then in a circumferential direction of the valve body, and wherein the discharge valve is provided with a liquid damper chamber defined between an outer circumference of the seat member and an outer circumference of the valve body, and an inner circumference of the valve body housing to face the flow in the circumferential direction, wherein the liquid damper chamber includes a first tubular passage defined between the outer circumference of the valve body and the inner circumference of the valve body housing, and a second tubular passage defined between the outer circumference of the seat member and the inner circumference of the valve body housing.