LUBRICATING DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

A supply pump includes a housing that has a tappet receiving chamber, which receives a plunger drive mechanism, and oil for lubricating respective lubricating portions of the plunger drive mechanism is temporarily retained in the tappet receiving chamber. In the housing, a communication hole opens in an inner peripheral wall surface of a tappet guide and guides the oil from a tappet upper side chamber into a tappet lower side chamber at the time of upwardly moving a tappet.

主权项

1. A lubricating device for an internal combustion engine, comprising:
a camshaft that includes a cam and is rotatable synchronously with an output shaft of the internal combustion engine; a high pressure fuel pump that includes:
a plunger, which is reciprocatable along a contour of the cam; anda drive mechanism, which converts rotation of the cam into reciprocation of the plunger to reciprocate the plunger, wherein the high pressure fuel pump pressurizes the fuel drawn through the reciprocation of the plunger; and a housing that includes a receiving chamber, which receives the drive mechanism, wherein oil is retained in the receiving chamber, wherein: the drive mechanism includes:
a roller, which contacts the cam; anda tappet, which is integrally movably connected to the roller and reciprocates integrally with the plunger; the tappet includes a partition portion, which partitions the receiving chamber into a plunger side chamber and a cam side chamber; the housing includes:
a guide, which is configured into a tubular form and guides the tappet in a reciprocating direction of the tappet; anda communication hole, which communicates between the plunger side chamber and the cam side chamber; and the cam side chamber is a first volume variable chamber that is formed by a roller contact surface of the cam, an inner peripheral surface of the guide, and a cam side surface of the tappet.