| 摘要 |
There is provided 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 fuel supply pump includes a cylinder head that is fitted to a cylinder hole formed in a pump housing, a plunger that is slidably fitted to a sliding hole of 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. 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. |
