Tappet with cam follower roller for fuel high pressure pump of heavy duty internal combustion engine

Abstract

A tappet (1) for a high-pressure fuel pump in a heavy-duty internal combustion engine is proposed, comprising a housing (2) having a cam follower roller (4) rotating on a pin (6) at its upper annular end face (3). The pin (6) is disposed in a receiving portion (7) of an opposing plane (8) of the housing (2), wherein the housing (2) is penetrated below the plane (8) by a separate bridge-shaped member (10). The end face (11) of the bridge-shaped member (10) facing the upper annular end face (3) of the housing (2) contacts the lower crossbeam (12) of the plane (8), and the end face (16) of the bridge-shaped member (10) facing the lower annular end face (15) of the housing (2) is held outside the housing (2) by a retaining ring (31), wherein the bridge-shaped member (10) abuts against the inner wall (14) of the housing (2) in the circumferential region of the plane (8) via two opposing ring segments (18). The housing (2) is cut at least one of the annular segments (18) by a channel (19) for lubricating oil, the channel (19) starting from an oil reservoir (20) on the outer peripheral surface (9) of the housing (2) and leading to a radial hole (21) in the bridge member (10), the radial hole (21) being cut downstream by at least one axial hole (22) in the bridge member (10), the axial hole (22) having an outlet (23) in a length section between the upper end face (11) of the bridge member (10) and the planes (8) of the housing (2), wherein, viewed from the axial direction of the cam follower roller (4), the outlet (23) is located at the gap (24) between the cam follower roller (4) and an inner wall (25) of the corresponding plane (8), in which an upward channel (26) for continuing to guide the lubricating oil to the bearing (5) is formed.

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