Application of Kinematically Compatible Rolling-Contact Pairs to the Design of Low-Friction Rocker-Pivots

The concept of rolling-contact has been applied to reduce friction at highly loaded rocker-pivots without the use of rolling element bearings. Various configurations for a rolling motion at the pivot are discussed. As an example, this rolling-contact concept is applied to the pivot of a valve-train rocker. Problems relating to stability and motion distortion of the rocker are addressed and solved, resulting in significant friction reduction at the pivot.