High-pressure pump and production method thereof
AssigneeDenso Corporation
InventorMasaharu NAKAOKA
Life of this patent
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Abstract
A pump body of a high-pressure pump includes a pressure chamber formed in a deep portion of a cylinder. A plunger reciprocates within the cylinder to vary a volume of the pressure chamber. A discharge path and a supply path are formed in the pump body and extend in a radial direction of the cylinder from the pressure chamber. A pin provided at an end of the plunger in the pressure chamber protrudes in one radial direction of the plunger to the outside of an inner circumference of the cylinder. In this case, the pin is engaged with a step portion between the cylinder and the pressure chamber in a state before attachment of the high-pressure pump to an internal combustion engine. Accordingly, separation of the plunger from the cylinder is avoidable.
Claims15
A high-pressure pump comprising:
- a cylinder;
- a pump body including a pressure chamber having a larger inside diameter than an inside diameter of the cylinder, the pressure chamber provided in a deep portion of the cylinder;
- a plunger that reciprocates within the cylinder to vary a volume of the pressure chamber;
- a fuel path formed in the pump body so as to extend in a radial direction of the cylinder from the pressure chamber;
- and
- a protrusion portion protruding in one radial direction from an end of the plunger in the pressure chamber to the outside of an inner circumference of the cylinder.
Dependencies are inferred from the claim text.