Lever-type cam follower
The invention proposes a lever-type cam follower ( 1 ) made without chip removal out of a sheet steel for use in a valve train of an internal combustion engine for actuating at least one gas exchange valve. This lever-type cam follower ( 1 ) is characterized by being made of a cold-forming, core-hardening heat-treatable steel.
1. A lever cam follower made without chip removal out of a sheet steel for use in a valve train of an internal combustion engine for actuating at least one gas exchange valve, said sheet steel being a cold formable, core-hardening heat-treatable steel, the cam follower having a core hardness of >600 HV and a surface hardness of >680 HV, the steel sheet being a heat-treatable steel of the brand C45M comprising
0.39-0.46% C, up to 0.15% Si, 0.55-0.70% Mn, up to 0.020% P, up to 0.07% S, 0.25-0.40% Cr, 0.020-0.060% Al, 0.0040-0.0100% N 2 , 0.10-0.20% Ni, 0.05-0.10% Mo, up to 0.005% Sn, up to 0.002% Sb, up to 0.15% Cu, the total of Ni, Mn, Cr equals 1.00 to 1.45% and a balance of Fe and unavoidable impurities.