Fuel supply pump

摘要

A fuel supply pump in which even when a tappet slides at high speed, a sliding balance of the tappet is maintained and improved durability is achieved by preventing one-sided contact between the tappet and a cylinder hole.;The tappet is configured to have a cylindrical tappet body and a roller, and a cylindrical guide ring is fixed into the cylinder hole. In the tappet body and a cylindrical portion of the guide ring, a tappet side guide portion and a guide ring side guide portion which can be fitted thereto in an axial direction are provided in at least two locations at equal intervals.

主权项

1. A fuel supply pump comprising:
a pump housing; a cylinder head that is fitted to a cylinder hole formed in the pump housing; a plunger that is slidably fitted to a sliding hole formed in the cylinder head; a tappet that is slidably fitted to the cylinder hole; a cam shaft that is rotatably supported in a cam chamber formed inside the pump housing so as to communicate with the cylinder hole; a cam that is formed integrally with the cam shaft; and a plunger spring that is interposed between the cylinder head and the tappet, wherein the tappet is configured to have a cylindrical tappet body and a roller, wherein a cylindrical guide ring is fixed into the cylinder hole, and wherein in the tappet body and a cylindrical portion of the guide ring, a tappet side guide portion and a guide ring side guide portion which can be fitted thereto in an axial direction are provided in at least two locations at equal intervals.