The Evaluation of Cam Lubrication Characteristics in I.C. Engine

In this paper three evaluating parameters for cam lubrication characteristics in I.C. engine are introduced, namely the lubrication characteristic number N_s, the hydrodynamic characteristic number N_γ, and the non-dimensional lubrication characteristic number N̄_s. The relations among them are deduced. From viewpoint of lubrication some basic points for the design of the cam profile are presented. The requirement for the condition N_s =0 is also proposed, i.e. (dN_s /dϕ)N_s =0 ≥3mm/°. These evaluating parameters for cam lubrication characteristics of several current I.C. engines are computed, and finally some conclusions are drawn.