DISENGAGEABLE VALVE DRIVE MEANS

摘要

A disengageable valve drive means which may be employed in internal combustion engines having a retarding mode of the compression-release type additionally to the normal powering mode consists of at least two tubular members (258,288) which are engaged to each other in the normal powering mode and which are disengaged in the retarding mode so that the inner tubular member (280) may slide in the other tubular member (258) in order to disable or modify the normal valve motion. The disengageable valve drive means may be incorporated into the valve pushtube, the rocker arm adjustings crew, rocker arm, rocker arm shaft or crosshead.