Patent ID: 8662868
Filing Date: 2014-03-04
Classification: F04B

Abstract:
1. A high pressure pump comprising: a plunger that is adapted to reciprocate in an axial direction; a housing that includes a pressurizing chamber and a fluid chamber, wherein the plunger pressurizes fuel in the pressurizing chamber through reciprocating movement of the plunger, and the pressurizing chamber is communicated with the fluid chamber; a delivery valve that discharges the fuel, which is pressurized to a predetermined pressure or higher in the pressurizing chamber, through a fuel outlet; a metering valve that discharges a portion of the fuel from the pressurizing chamber to the fluid chamber by opening or closing a fuel passage, which communicates between the pressurizing chamber and the fluid chamber, when a volume of the pressurizing chamber is reduced by the plunger; a cover member that covers an opening of the fluid chamber, which is formed in the housing; a damper member that is placed in the fluid chamber and includes a first-side diaphragm and a second-side diaphragm, wherein a first-side outer peripheral portion of the first-side diaphragm and a second-side outer peripheral portion of the second-side diaphragm are joined together in a joined part thereof to form a sealed damper chamber between the first-side diaphragm and the second-side diaphragm; a first-side support member that supports the first-side outer peripheral portion of the damper member from a cover member side of the first-side outer peripheral portion in the axial direction at a radial location, which is radially inward of the joined part; a second-side support member that supports the second-side outer peripheral portion of the damper member from a housing side of the second-side outer peripheral portion in the axial direction at the radial location, which is radially inward of the joined part; and an annular resilient member that is placed between the cover member and the first-side support member to urge the first-side support member against the first-side outer peripheral portion and to urge the second-side support member against the housing through the damper member, wherein: the first-side support member includes an annular support portion at a cover member side of the first-side support member to support both of an inner peripheral surface and a housing side surface of the annular resilient member; the annular support portion includes: a guide portion, which is configured into a tubular form and guides the inner peripheral surface of the annular resilient member; and an urging portion, which radially outwardly projects from the guide portion and is configured into an annular plate form, wherein the housing side surface of the annular resilient member urges the urging portion, the fluid chamber includes an outer fluid chamber, which is located radially outward of the annular support portion and circumferentially extends all around the annular support portion; the outer fluid chamber is communicated with the pressurizing chamber; and the first-side outer peripheral portion and the second-side outer peripheral portion are clamped in the axial direction between the first-side support member and the second-side member at the radial location, which is radially inward of the joined part, along an entire circumferential extent of the first-side outer peripheral portion and the second-side outer peripheral portion.