Fluid Pressure Pulsation Damper Mechanism and High-Pressure Fuel Pump Equipped with Fluid Pressure Pulsation Damper Mechanism

A fluid pressure pulsation damper mechanism, comprising:

• a metal damper having two metal diaphragms joined together with a hermetic seal for forming a sealed spacing filled with a gas between the two metal diaphragms, an edge part at which are overlapped along outer peripheries thereof,
• a main body having a damper housing in which the metal damper is accommodated;
• and a cover attached to the main body to cover the damper housing;
• a damper chamber formed between the cover and the main body, in which the edge part of the metal damper is held between the cover and the main body, wherein:
• the cover is made of a metal plate having a uniform thickness, and having a high-stiffness bending area that bends inwardly and a low-stiffness area disposed around the bending area;
• and
• the edge part of the metal damper is held between a holding part on the main body and the high-stiffness bending area of the cover.

A high-pressure fuel pump equipped with a fluid pressure pulsation damper mechanism comprising:

• a body having a fuel inlet, a fuel outlet, a fuel pressurizing chamber formed therein, a cylinder fixed inside of the fuel pressurizing chamber and a plunger fitted into the cylinder for being reciprocatably slidable;
• an intake valve mechanism provided at an inlet of the fuel pressurizing chamber;
• an expelling valve mechanism provided at an outlet of the fuel pressurizing chamber, wherein
• fuel supplied from the fuel inlet is drawn by reciprocating of the plunger in the fuel pressurizing chamber through the intake valve mechanism into the fuel pressurizing chamber, and then pressurized in the fuel pressurizing chamber, pressurized fuel being drawn from the expelling valve mechanism to the fuel outlet;
• a metal damper having two metal diaphragms joined together with a hermetic seal for forming a sealed spacing filled with a gas between the two metal diaphragms, an edge part at which are overlapped along outer peripheries thereof;
• a damper housing part disposed in a fuel channel formed between the fuel inlet and the intake valve mechanism;
• and
• a cover attached to the body to cover the damper housing and isolate the damper housing from an outside air, the metal damper being held between the cover and a holding part of the body;
• wherein:
• the cover is made of a metal plate having a uniform thickness, and having a high-stiffness bending area that bends inwardly and a low-stiffness area disposed around the bending area;
• and
• the edge part of the metal damper is held between the holding part of the body and the cover in the high-stiffness bending area that bends inwardly.