Patent ID: 6644254
Filing Date: 2003-11-11
Classification: F01L

Abstract:
A valve train for an internal combustion engine, comprising:a rocker shaft provided wit an oil passage therein; a plurality of rocker arms having support parts provided with bores, respectively, to receive the rocker shaft therein so as to be supported on the rocker shaft for rocking motion and operated for the rocking motion by cams to operate valves of the internal combustion engine, one of said rocker arms being provide with a pressure chamber and a connecting passage formed in one end part of the one rocker arm, said connecting passage extending obliquely to a direction parallel to an axis of the bore of the support part of said one rocker arm and being connected, through an open end of the connecting passage, to said oil passage formed in the rocker shaft, said bore of said one rocker arm having an open end surface on the side of said one end part; said connecting passage being directed toward said open end surface of the one rocker arm and inclined to said axis of the bore of said one rocker arm so that an imaginary passage forming an extension of the connecting passage toward said open end surface intersects the open end surface; a rocker arm interlocking mechanism including a connecting piston fitted in the pressure chamber of said one rocker arm so as to be displaced in a direction parallel to said axis by pressure of working fluid supplied into the pressure chamber of the one rocker arm, said rocker arm interlocking mechanism being operable to change the position of the connecting piston in the pressure chamber to engage the plurality of rocker arms or disengage the plurality of rocker arms; and a roller-receiving opening formed in said one rocker arm to accommodate a roller, said connecting passage extending from said pressure chamber in a direction away from said roller-receiving opening to said open end surface of the one rocker arm.