A cam follower, comprising: a tappet which includes two flanges provided with opposite holes centered on a transverse axis; a pin extending along the transverse axis between two opposite ends received in the opposite holes; and a roller movable in rotation relative to the pin around the transverse axis and adapted to roll on a cam. Each of the opposite holes is provided with: an open portion for mounting the pin by translation in a first direction perpendicular to the transverse axis, a cylindrical portion for supporting the pin along the first direction and a plane portion for retaining the pin along the transverse axis during transport and mounting of the cam follower. A method includes steps for manufacturing such a cam follower.

The disclosed apparatus, systems and methods relate to an indexed hydraulic roller lifter for use in internal combustion engines.

A cam follower assembly is provided including an improved lubricant flowpath. The assembly includes a generally cylindrical housing including an annular groove adapted to be in communication with a lubricant gallery in an engine block or cylinder head. An axial end of the housing includes skirt portions including openings, and one of the skirt portions includes a first recessed section indented from an outer lateral surface of the housing and extending axially between the annular groove and a respective one of the openings. A pin is mounted in the openings of the skirt portions and has a second recessed section indented from an outer lateral surface of the pin that extends to at least one of the ends of the pin. The second recessed section is in communication with the first recessed section, and a cam roller supported on the pin.

An engine roller lifter for use in a valve train of an internal combustion engine includes a body, an anti-rotation device and a clip. The body can have an outer peripheral surface configured for sliding movement in a bore provided in the engine. The body can define a receiving channel formed in the outer peripheral surface. The body can further define a slot formed at the receiving channel. The anti-rotation device can include a guide plug received in the receiving channel of the body. The guide plug can extend outwardly from the outer peripheral surface of the body. The guide plug can be configured to locate into a bore slot defined in a cylinder head of the internal combustion engine. The clip can be received by the slot and captured the guide plug in the receiving channel.

A mechanical system that forms a cam follower or a rocker arm. The mechanical system includes a support element, a pin extending between two opposite ends along a first axis, and a roller mounted on the pin, movable in rotation relative to the pin around the first axis and adapted to roll on a cam. The support element further comprises an insert having holding members supporting the pin ends, provided with cut-outs having a shape complementary to the shape of the pin-ends, for assembling pin with insert by quarter-turn around the first axis. The pin ends each have a flat surface and an external surface. A first dimension of each pin end, measured perpendicularly to the flat surface, between the flat surface and the external surface of the pin end, is higher than half the outer diameter of the pin ends.

A roller lifter includes a lifter body having a cylindrical peripheral wall and a roller rotatably mounted on the lifter body via a shaft member and brought into contact with a cam. The peripheral wall has an outer periphery formed with a sliding surface which is slid on an inner wall of a cylinder. The lifter body has a rotation stopper formed by outwardly protruding a part of the peripheral wall, and an opening formed in another part of the peripheral wall which another part is radially opposed to the rotation stopper. The opening is open so that the rotation stopper oppositely faces the opening.

A rocker arm assembly includes a rocker arm configured to rotate about a rocker shaft and having a valve side end configured to selectively engage an engine valve, and a cam side end configured to be selectively engaged by a camshaft. A cylinder deactivation (CDA) capsule is coupled to the cam side end and includes an outer body having at least one slot formed therein, the outer body configured to be coupled to the rocker arm, and an inner plunger at least partially received within the outer body and having at least one outwardly extending tab. The inner plunger is configured to translate within the outer body, and the at least one outwardly extending tab is received within the at least one slot and a groove formed in the rocker arm to facilitate preventing rotation of the inner plunger and outer body relative to the rocker arm.

An engine valve actuation system includes a camshaft, rotatable in an engine, and a compound collar including a mounting sleeve, a guide sleeve, and a bridge cantilevering the guide sleeve to the mounting sleeve. A first valve lifter is interference-fitted in the mounting sleeve, and a second valve lifter is slip-fitted within the guide sleeve. First and second lifter bores receiving the first and second valve lifters are congruent, and the first and second valve lifters may be substantially identical. The compound collar reciprocates with the interference fitted first valve lifter, slidably receives the slip-fitted second valve lifter, and limits in-service rotation of both.

An engine valve actuation system includes a camshaft, rotatable in an engine, and a compound collar including a mounting sleeve, a guide sleeve, and a bridge cantilevering the guide sleeve to the mounting sleeve. A first valve lifter is interference-fitted in the mounting sleeve, and a second valve lifter is slip-fitted within the guide sleeve. First and second lifter bores receiving the first and second valve lifters are congruent, and the first and second valve lifters may be substantially identical. The compound collar reciprocates with the interference fitted first valve lifter, slidably receives the slip-fitted second valve lifter, and limits in-service rotation of both.

An engine valve actuation system includes a rotatable camshaft, a first valve lifter, and a second valve lifter, structured to actuate valves in an engine in response to rotation of cams of the camshaft. The engine valve actuation system includes an anti-rotation device having a collar with a sleeve portion and a boss portion, and a bridge connector structured to couple with one of the valve lifters. Another one of the valve lifters is slidably received in the sleeve portion. The anti-rotation device reciprocates with the one of the valve lifters, and each of the valve lifters is restricted from rotation during service.