The cam follower roller device provides a tappet body extending along an axis, an insert 18 mounted in the tappet body, a pin 14 mounted at least on the insert and a roller mounted on the pin. The device further provides a removable retaining plug carried by the tappet body and adapted to retain the insert relative to the body. A radial interference fit is provided between the retaining plug and the tappet body.

The cam follower roller device providing a tappet body extending along an axis, an insert mounted in the tappet body, a pin mounted at least on the insert and a roller mounted on the pin. The device further provides a retaining washer mounted into a bore of the tappet body so as to axially retain the insert inside the tappet body. The tappet body provides retention means, cooperating with the washer to axially retain the washer relative to the tappet body. The retaining washer is axially interposed between the insert and the retention means.

A valve lifter with a variable lift mechanism is required to be deployed at a predetermined angle with respect to a cam unit, and the present invention is intended to achieve this requirement with a simple configuration without too much processing such as a fitting of the conventional longitudinal groove and a pin. A cam sliding contact surface of a valve lifter on which a high lift cam and a low lift cam slides is formed to be a smooth inclined surface and a cam slide starting point is lower than a cam slide terminating point, thereby establishing an elevation difference between the cam slide starting point and the cam slide terminating point. As a result, since the high lift cam and the low lift cam always move uphill on the cam sliding contact surface, namely, from the low cam slide starting point toward the high cam terminating point along the slope of the cam sliding contact surface, the valve lifter is not subjected to a force around the reciprocating axis from the cam and therefore, the direction of the valve lifter is maintained constant.

A mechanical system forms a cam follower or a rocker arm and includes a support element, a pin extending between two opposite ends along a first axis and supported by the support element, 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 includes a first axial abutment feature blocking the translation of a pin assembly including at least the pin, in a first direction parallel to a second axis perpendicular to the first axis. The mechanical system additionally includes an insert inserted in the support element and supporting the pin opposite the first axial abutment feature, wherein the first axial abutment feature protrudes outside a cavity delimited by the support element and receiving the pin.

A method for manufacturing a roller, adapted to equip a mechanical system forming a cam follower or a rocker arm. The roller is centered on a central axis and comprising: an outer cylindrical surface adapted to roll on a cam, an inner cylindrical bore adapted to receive a pin belonging to the mechanical system, and two lateral faces extending radially to the central axis. The method includes a machining step forming circular grooves that are concentric with each other on at least one of the lateral faces of the roller. The roller can be installed within a mechanical system.

A washer member disposed in a valve housing of an engine is disclosed. The washer member resiliently supports an injector push member via an elastic member and receives a pair of hydraulic lash adjusters for operating an inlet valve and an outlet valve of a cylinder of the engine. The washer member includes a base portion adapted to abut a support member disposed within the valve housing. The support member defines a clearance with the valve housing to movably dispose the pair of hydraulic lash adjusters within the valve housing. The washer member further includes a side portion extending from the base portion. The side portion is configured to define a lateral movement of the elastic member within a tolerance limit. The side portion is further configured to define a rotational movement of the washer member within a tolerance limit.

A roller tappet for a fuel unit pump of an internal combustion engine is provided with a roller tappet bore for inserting the roller tappet within the internal combustion engine. The roller tappet includes a roller tappet body having a body longitudinal axis for connecting the roller tappet to a reciprocating element of the fuel unit pump. A cam roller contacts a cam lobe of a rotatable shaft of the internal combustion engine. The cam roller is rotatably mounted to the roller tappet body around a cam roller rotation axis. The external surface of the roller tappet body is configured to allow tilting of the roller tappet within the roller tappet bore for aligning the roller tappet with respect to the cam lobe of the rotatable shaft.

A switchable support element (1) for a valve train of an internal combustion engine is disclosed, including a housing (4), in the bore of which (5) an axially displaceable inner element (7) is located, wherein two coupling slides (9) run in a radial bore (8) of the inner element (7) and can be brought into engagement with a driver surface of the housing (4) in an axially extended position, wherein the extended position is limited by a height stop (10), which is formed of a circlip assembly, which runs peripherally on an annular shoulder (13) of the inner element (7) and which, in the event of contact, lies radially externally above the upper annular end (14) thereof in abutment against a lower annular edge (15) of an annular groove (16) of the housing (4) near the upper edge thereof (17), and wherein an outer casing (11) of the housing is enclosed by a rotationally fixed ring as an outer anti-twist mechanism (12) with an offset bore (18).

An anti-rotation guide for a lifter in an overhead valve valvetrain. The anti-rotation guide includes a plug having two lobes connected through a neck region. A first lobe of the plug is held within a bore in the lifter. The bore forms an opening at the edge of the lifter through which the neck of the plug emerges. The bore in the lifter accommodates a first lobe of the plug that is wider than the opening in the edge of the lifter, whereby the plug is shaped to prevent its slipping from the lifter through the opening. The lifter reciprocates in a first bore in the cylinder head. The second lobe of the plug extends outward from the lifter into a second bore formed in the cylinder head and adjoining the first bore. The second lobe reciprocates in the second bore and limits rotation of the lifter.

In one embodiment, a lifter assembly comprises a lifter having a latching mechanism, a slot arranged on an outer wall of the lifter and comprising an inlet that provides access to the latching mechanism, and a pin comprising a fluid channel. The latching mechanism is switchable between a latched position and an unlatched position. The pin is configured to interface with the slot such that the lifter is prevented from rotation about a lifter axis. The fluid channel is configured to be fluidly coupled to the inlet of the slot.