Valve operating apparatus in an internal combustion engine.

摘要

Apparatus for maintaining a cam follower (9) for operating a valve (1a,1b) of an internal combustion engine in biased engagement against its cam (5) includes a first spring (22) operative to bias the cam follower under a low speed engine operating condition and a second spring (23) series-connected to the first spring and having a spring constant greater than that of the first spring and operative to bias the cam follower under a high speed engine operating condition.