| 摘要 |
<p>Provided is a lash adjuster which enables a thread surface to resistant to wear and ensures a certain level of frictional coefficient between thread surfaces for a long period of time even in a Diesel engine in which a large amount of carbon soot is mixed with an engine oil. The lash adjuster (1) includes a nut member (17) having a female screw thread (16) on the inner circumference; an adjusting screw (19) having a male screw thread (18) on the outer circumference, the male screw thread being brought into screw engagement with the female screw thread (16); and a return spring (20) for exerting a force on the adjusting screw (19). The adjusting screw (19) is axially moved while rotating through the nut member (17), thereby adjusting a gap between component members of a valve actuating device. The lash adjuster (1) is adapted such that the adjusting screw (19) has a scratch-brush finished thread surface (19a) and the thread surface (19a) is provided thereon with a high-hardness carbide layer (27) which has a hardness equal to or greater than Hv1500.</p> |
