Coating cams with dry lubricant film by screen printing, by coating periphery of cams with precursor paste of lubricant film, and solidifying paste to form film, where cams are designed to be fixed on camshaft including single-piece shaft

摘要

The process comprises coating a periphery of cams (3) with a precursor paste of a dry lubricant film (42), and solidifying the precursor paste so as to form the dry lubricant film. The cams are designed to be fixed on a camshaft (1), which includes a single-piece shaft (2). The precursor paste is coated in a groove that extends around the periphery of the cam and is delimited by two lateral edges. The groove has a depth of 5-50 mm. An external part of two lateral edges of the cam is chamfered after the solidifying step. The solidifying step is performed by firing the precursor paste. The process comprises coating a periphery of cams (3) with a precursor paste of a dry lubricant film (42), and solidifying the precursor paste so as to form the dry lubricant film. The cams are designed to be fixed on a camshaft (1), which includes a single-piece shaft (2). The precursor paste is coated in a groove that extends around the periphery of the cam and is delimited by two lateral edges. The groove has a depth of 5-50 mm. An external part of two lateral edges of the cam is chamfered after the solidifying step. The solidifying step is performed by firing the precursor paste. The precursor paste is made of an aqueous solvent, and comprises a polymer having a coefficient of friction that is 2 times lower than the coefficient of friction of a material of the cam.