LUBRICATION OIL INJECTOR USED IN LARGE LOW-SPEED TWO-STROKE ENGINE AND HAVING HARDENED VALVE SEAT AND MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide an improved lubrication oil injector for a large low-speed two-stroke engine.SOLUTION: An injector (4) for injecting lubrication oil into a cylinder (1) of a large low-speed two-stroke engine, especially a marine diesel engine, has an injector housing (12) accommodating a valve member (16), wherein the injector housing has a plain bearing (23) with a first surface, the valve member has a stem (17) with a second surface, and the second surface is provided while slidably abutting against the first surface so that the stem is reciprocably guided by the plain bearing along a contact region (24) between the stem and the plain bearing. The first surface and the second surface are hardened surfaces. A hardened surface for a valve seat (19) in the nozzle (14) is the point of technological improvement. It was found that the injector thus configured provides better uniform performance.SELECTED DRAWING: Figure 2a