High-pressure pump and method for manufacturing same
AssigneeDenso Corporation
InventorsShinobu OIKAWA, Masaharu NAKAOKA
Life of this patent
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Abstract
A plunger of a high-pressure pump is provided reciprocatably on an inner side of a cylinder. A holder disposed on an opposite side of the cylinder from a pressurizing chamber includes a large tubular portion that provides a predetermined space between the large tubular portion and an outer wall of the plunger, and a small tubular portion that is disposed on an opposite side of the large tubular portion from the cylinder. A pin inserted into a hole of the plunger at a position corresponding to the large tubular portion protrudes radially outward from the outer wall of the plunger and is accommodated in a space on an inner side of the large tubular portion.
Claims11
A high-pressure pump comprising:
- a cylinder;
- a pump body that includes a pressurizing chamber provided in an end portion of the cylinder;
- a plunger that is disposed reciprocatably on an inner side of the cylinder and is capable of changing a volume of the pressurizing chamber;
- a cylindrical member that is disposed coaxially with the cylinder on an opposite side of the cylinder from the pressurizing chamber, and the cylindrical member including a large tubular portion which defines a predetermined space between the large tubular portion and an outer wall of the plunger, and a small tubular portion having an inner diameter smaller than an inner diameter of the large tubular portion and being located on an opposite side of the large tubular portion from the cylinder;
- and
- a locking member protruding radially outward from the outer wall of the plunger at a position corresponding to the large tubular portion of the cylindrical member, the locking member being accommodated in the space on an inner side of the large tubular portion.
Dependencies are inferred from the claim text.