| 摘要 |
PROBLEM TO BE SOLVED: To provide a high pressure fuel pump without seizure by preventing surface pressure of a contact part between a cylinder and a plunger from becoming high, and specifically, by reducing remaining burr occurring due to grinding, as when the plunger reciprocating in the cylinder comes in contact at high surface pressure with a corner part or burr remaining on a connecting part between a cylindrical face and a chamfer, there is potential that scratches occur on the surface of the plunger, the burr falls off and bites in a minute gap between the cylinder and the plunger, and as a result, seizure occurs in the cylinder and the plunger, causing the both to become fixed. SOLUTION: In this high pressure fuel pump, an inner peripheral face of the cylinder 6 comprises the cylindrical face forming a through-hole, diameter increased parts formed at both ends thereof, and curved faces formed at connecting parts connecting the cylindrical face to the diameter increased parts. According to this structure, the surface pressure of the contact part between the cylinder and the plunger becomes low, and seizure of the both parts can be reduced. COPYRIGHT: (C)2011,JPO&INPIT
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