Abstract: A rocker arm of the cam-follower type capable of simultaneously operating two valves of a cylinder of an internal combustion engine is disclosed. In a preferred form, the rocker arm has a one-piece, cold-formed body which is of inverted U-shaped cross section throughout much of its length. The rocker arm body is of generally Y-shaped configuration as viewed from above. The extremities of the arms of the Y-shaped body are shaped to engage ends of valve stems and the extremity of the leg of the Y-shaped body has an axle on which a cam-contacting roller is rotatably mounted. An intermediate portion of the rocker arm has an upwardly-facing recess to receive an end of a pivot post.

Abstract: A low-friction, boat-type, cold-formed rocker arm is provided. The rocker arm is of generally U-shaped configuration in transverse cross section throughout most of its length. An intermediate portion of the rocker arm has a concave interior surface extending there-across with a central opening through which a shank of a pedestal extends. One end portion of the rocker arm has a concave recess facing downwardly to receive the upper end of a push rod. The other end portion of the rocker arm has a rectangular opening in the bottom thereof. An axle extends between side walls of the rocker arm above the rectangular opening and a roller is rotatably mounted on the axle and has a circumferential portion exposed at the rectangular opening. The roller engages an end of a valve stem with rolling, rather than sliding, contact, resulting in lower friction during operation of the rocker arm.

Abstract: A one-piece, cold-formed rocker arm of the cam-follower type is provided. The rocker arm includes a one-piece metal body cold formed from a metal blank and being of inverted U-shaped cross section throughout most of its length. The body has a top wall with depending, structurally-integral side walls. An intermediate, convex portion of the top wall has an opening extending therethrough with an axle extending between the side walls below the opening. A cam-contacting roller is rotatably mounted on the axle and has a circumferential surface exposed at the opening to engage a cam. The rocker arm body has a recess at one end portion to receive a lifter post and an additional recess at another end portion to receive an end of a valve stem. The one end portion of the body is wider than the remainder of the body. Ribs are formed at the lower edges of the body and extend along the intermediate portion of the body between the two end portions.