Patent ID: 7794216

Claim:
A high-pressure pump comprising: a plunger, and a cylinder body in which a pressurizing chamber is provided, wherein the plunger is inserted into a slide hole of the cylinder body provided between the pressurizing chamber and a drive cam, so as to slide and reciprocate within the slide hole; a biasing member which biases the plunger towards the drive cam and the drive cam allows movement of the plunger toward the drive cam so as to cause fluid to be sucked into the pressurizing chamber; a drive cam nose of the drive cam moves the plunger toward the pressurizing chamber so as to cause the fluid to be pressurized in the pressurizing chamber; a flow passage of the fluid discharged from the pressurizing chamber forms a space between the plunger and a wall of the slide hole; a fluid reservoir is provided in the flow passage to store the fluid, the fluid reservoir's capacity increases as the plunger moves toward the drive cam and decreases as the plunger moves toward the pressurizing chamber; and a reservoir chamber is fluidly connected to the fluid reservoir for returning the fluid to a fuel tank.