Supply pump

摘要

A supply pump includes a housing, a tappet, a guide groove, and a stopper pin. The housing includes a cylindrical sliding wall. The tappet is configured to be reciprocated along the sliding wall. The guide groove is provided for one of the housing and the tappet. One end of the guide groove includes a tapered surface. The stopper pin is provided for the other one of the housing and the tappet. The stopper pin is fitted into the guide groove to stop rotation of the tappet relative to the housing. When the tappet is displaced abnormally in an upper direction, the tapered surface is pressed on an end of the stopper pin to be engaged with the stopper pin.

主权项

1. A supply pump comprising:
a housing that includes a cylindrical sliding wall; a tappet that is configured to be reciprocated along the sliding wall, wherein: a displacement direction of the tappet at time of compression operation of the supply pump is defined as an upper direction; a displacement direction of the tappet at time of suction operation of the supply pump is defined as a lower direction; a guide groove that is provided for one of the housing and the tappet, wherein one end of the guide groove includes a tapered surface; a stopper pin that is provided for the other one of the housing and the tappet, wherein: the stopper pin is fitted into the guide groove to stop rotation of the tappet relative to the housing; when the tappet is displaced in the upper direction abnormally as a result of the tappet being positioned outside of a predetermined range, the tapered surface is pressed on an end of the stopper pin to be engaged with the stopper pin; the guide groove is provided for the tappet; the tapered surface is provided only at a lower end of the guide groove, and an upper end of the guide groove is a non-tapered surface; and a longitudinal axis of the stopper pin passes through a central axis of the tappet.