Abstract: A high pressure fuel pump includes a plunger, which slidably reciprocates along a slide axis in an inside of a cylinder, a tappet body, which reciprocates integrally with the plunger, and a roller, which is held by the tappet body and is rotated by rotation of a camshaft. When the roller and the cam main body are viewed in a direction of an axis of the camshaft, a contact point, at which the roller and the cam main body contact with each other, is displaced from an intersection point, at which the slide axis of the plunger and a tangent line to a circle of a cross section of the roller at the contact point intersect with each other, in a counter-rotational direction of the cam main body, which is opposite from a rotational direction of the cam main body.

Abstract: A housing has a cylinder and a compression chamber. A plunger is slidable in the cylinder and configured to pressurize fuel in the compression chamber. A cam is eccentric with respect to a shaft center axis of a camshaft and integrally rotatable with the camshaft. A sliding member is slidable around an outer circumferential periphery of the cam and configured to revolve around the shaft center axis in conjunction with rotation of the camshaft. The plunger is slidable on the sliding member and configured to convert the revolution into a linear movement. The cam and the sliding member are accommodated in the housing. The sliding member has an opening through which the outer circumferential periphery is partially exposed.

Abstract: A housing has a cylinder and a compression chamber. A plunger is slidable in the cylinder and configured to pressurize fuel in the compression chamber. A cam is eccentric with respect to a shaft center axis of a camshaft and integrally rotatable with the camshaft. A sliding member is slidable around an outer circumferential periphery of the cam and configured to revolve around the shaft center axis in conjunction with rotation of the camshaft. The plunger is slidable on the sliding member and configured to convert the revolution into a linear movement. The cam and the sliding member are accommodated in the housing. The sliding member has an opening through which the outer circumferential periphery is partially exposed.