Provided is a tappet capable of supplying lubricating oil to a cam even when provided with a lash adjuster.

A tappet (10) includes: a lash adjuster (11) having a plunger (14) and a body (13) in which the plunger (14) is housed so as to be vertically movable, wherein the plunger (14) has a top portion (16) against which a lower end portion of a push rod (88) slidably abuts; and a tappet body (12) which has an assembly hole (45) in which the body (13) is inserted, has a cup-like shape, and has a lower surface portion (27) which slidingly contacts a cam (70). The tappet body (12) has an oil guide passage (30) extending so as to guide lubricating oil from the push rod (88) side to the cam (70).

An engine roller lifter for use in a valve train of an internal combustion engine according to one example of the present disclosure includes a body and a groove formed in the body. The body has an outer peripheral surface configured for sliding movement in a bore provided in the engine. The bore is supplied by an oil passage communicating therewith. The body defines an axial pocket that receives a plunger therein. The groove is inset from the outer peripheral surface and formed about only a portion of a circumference of the body. The groove defines a first end and a second end. Only a portion of the first and second ends overlap with the oil passage to regulate the amount of oil supplied to the groove from the oil passage.

An improved cam follower for a vehicle engine includes a body, a spring seat, a tower, a spring and an anti-rotation member. The body defines a body diameter, a first open end, and a second end. The spring seat includes a spring seat opening and an interlock portion. The spring seat may be affixed to the first open end of the body. The spring seat further includes a spring seat diameter wherein the spring seat diameter is greater than the body diameter. The tower may be disposed in a pin housing through the spring seat opening at the first open end of the body. The tower further includes an upper flange and a spring which abuts the upper flange at a first spring end. The second spring end abuts the spring seat. The anti-rotation member accordingly may be coupled to the body via the spring seat.

A hydraulic lash adjuster (HLA) sleeve configured to be received within a lifter bore of an engine block, includes a cylindrical sleeve having an outer surface defining an outer diameter, and an inner surface defining an inner diameter. The outer diameter is sized for an interference fit with the lifter bore to prevent rotation of the HLA sleeve within the lifter bore. The inner diameter is sized to receive a lifter.

An engine comprises a plurality of rotating eccentric cams on a cam rail, a valve train mechanism, and respective followers wherein at least one of the respective followers has a respective first end in contact with a respective rotating eccentric cam and a respective second end in contact with the valve train mechanism, a body extending between the first end and the second end, and a follower fluid port. The engine further comprises an oil gallery bore parallel to the cam rail wherein the oil gallery bore is configured to supply oil to the respective follower through its fluid port. The engine further comprises a gallery insert placed in the oil gallery bore and is configured to abut the respective follower to prevent axial rotation with respect to the cam rail. The engine further comprises a gallery insert abut a flat surface of a follower to prevent axial rotation.

The invention relates to a reciprocating-piston machine, comprising a valve actuation device for at least one gas exchange valve, at least one valve stroke transmission device, which has at least one valve stroke transmission element, which is arranged between the gas exchange valve and the camshaft and which is mounted for movement between a first Position associated with a closed Position of the gas exchange valve and a second Position associated with an open position of the gas exchange valve, at least one halting device having a halting element mounted for movement between an actuation position and a release position in a machine housing or a housing-fixed component parallel to a guiding surface of the first valve stroke transmission element that the halting element at least shows the displacement motion of the first valve stroke transmission element and releases said displacement motion in the release position.

An engine roller lifter for use in a leak-valvetrain of an internal combustion engine includes a body, a roller and an anti-rotation plug. The body includes an outer peripheral surface configured for sliding movement in a bore provided in the engine. The bore is supplied oil by an oil passage communicating therewith. The body defines an opening. The roller bearing is rotatably mounted to the body and is configured for rolling contact with an engine camshaft. The anti-rotation plug is received at the opening and has a plug body including an anti-rotation protrusion that extends radially beyond an outer peripheral surface of the plug body. The anti-rotation plug can be staked into the opening of the body.

An improved cam follower for a vehicle engine includes a body, a spring seat, a tower, a spring and an anti-rotation member. The body defines a body diameter, a first open end, and a second end. The spring seat includes a spring seat opening and an interlock portion. The spring seat may be affixed to the first open end of the body. The spring seat further includes a spring seat diameter wherein the spring seat diameter is greater than the body diameter. The tower may be disposed in a pin housing through the spring seat opening at the first open end of the body. The tower further includes an upper flange and a spring which abuts the upper flange at a first spring end. The second spring end abuts the spring seat. The anti-rotation member accordingly may be coupled to the body via the spring seat.

An engine roller lifter for use in a valve train of an internal combustion engine according to one example of the present disclosure includes a body and a groove formed in the body. The body has an outer peripheral surface configured for sliding movement in a bore provided in the engine. The bore is supplied by an oil passage communicating therewith. The body defines an axial pocket that receives a plunger therein. The groove is inset from the outer peripheral surface and formed about only a portion of a circumference of the body. The groove defines a first end and a second end. Only a portion of the first and second ends overlap with the oil passage to regulate the amount of oil supplied to the groove from the oil passage.

The invention relates to an improved system of electro-mechanical hydraulic valve lifters for piston engine automobiles that increases fuel economy and reduces fuel emissions. The electro-mechanical hydraulic valve lifters enclose a magnetorheological fluid chamber, containing magnetorheological fluid. A control module manages voltage sent to the magnetorheological fluid in the magnetorheological fluid chamber. The control module introduces various amounts of magnetic flux to the magnetorheological fluid in the magnetorheological fluid chamber. The magnetorheological fluid's viscosity changes based on the amount of magnetic flux applied to it from the electromagnets and, along with the magnetorheological fluid chamber spring, controls how much an intake and exhaust port of the spark plug engine opens to control the amount of fuel used and exhaust let out of the engine.