Schaeffler Technologies Ag & Co .kg

Karsten Kucht

Norbert Geyer

Stefan Dorn

Norbert Radinger

Manfred Jansen

The invention relates to a tappet () for a high-pressure fuel pump or for a valve drive of an internal combustion engine, comprising a housing () which has a cam run-on surface () on the drive side () thereof, wherein an output side () of the housing () rests on a lower face () of a bridge piece () that projects through an inner shell () of the housing (), wherein an anti-turn lug () protrudes from the outer shell () of the housing () and is arranged in a window () in the latter, wherein said lug is substantially present as an upright body similar to a semi-cylinder in the region thereof protruding from the housing (), and the outer surface () of said lug, in cross section, results in an ogival curve made up of two or more circular arcs ().

Tappet

The invention concerns a roller tappet () for a high pressure fuel pump, said roller tappet () comprising a housing () comprising on a drive side front end (), a slide-mounted roller () serving as a running surface of a cam, said housing (), as viewed in housing direction, comprising a bridge member () arranged below the roller (), said bridge member () comprising on a front end () turned towards a driven side front end () of the housing (), a support () for a tappet follower member, wherein a shell member () like a semi shell or a one-third shell separated out of a rolling bearing ring is seated in a cylindrical cavity () of a further drive side front end () of the bridge member (), and the roller () extends for sliding displacement directly in said shell member ().

Roller tappet

A tappet () for a high-pressure fuel pump having a housing (), the drive input side (), which serves as a cam run-on face. The housing () incorporates a roller (), wherein the drive output side (), which serves as a contact surface for a tappet follower part, of said housing () bears against an underside () of a bridge piece () which projects through an inner casing () of the housing (), and a rotation prevention device () which projects beyond the outer casing () of the housing () extends in a window () of the housing (). The rotation prevention device () is formed by a radial elongation of the bridge piece (). A projection extends from the inner casing () of the tappet () only on a portion situated diametrically opposite the window (), which projection is integrally connected and is produced by a punching and embossing process and rises in a wedge shape in a direction of the drive input side. The section () of the sheet-steel bridge piece () which is situated diametrically opposite the radial elongation () is snapped over the projection (), and this section () rests with an edge region () of the underside () thereof on said projection ().

A tappet (), either for a high-pressure fuel pump or for a valve train of an internal combustion engine, with a housing () whose driven side () used for a contact of a tappet-following part forms a contact on a bottom side () of a bridge part () projecting through an inner casing () of the housing (). An anti-rotation locking device () projects past the outer casing () of the housing with a first cylinder section () and sits in a window () of the housing (), with this anti-rotation locking device () being provided as a cylindrical element, and tab-like projections () project from peripheral walls () of the window () and the anti-rotation locking device (), standing 'loose' in the window (), snaps behind these projections. A second cylinder section () of the anti-rotation locking device extends behind the inner casing () of the housing (), and the bridge part (), extending on an axial section of the anti-rotation locking device (), has in its peripheral section a recess () in its outer surface (), with the second cylinder section () of the anti-rotation locking device () being supported against this recess.

A mechanical roller tappet (,) comprising a tappet housing (,) shaped out of sheet metal, a drive roller () actuable by a cam () and an axle (,) on which the drive roller () is mounted, end portions () of the axle (,) being supported in axle eyes () of the tappet housing (,), said tappet housing (,) comprising a tappet skirt (,) and a tappet bottom () possessing a contact surface () for an adjacent engine component on a power take-off side and at an end of the tappet skirt facing the cam, the tappet bottom is connected to the tappet skirt and is shaped into the interior of the tappet skirt while forming a pocket for receiving the drive roller, the axle eyes being arranged in first sections () of the tappet bottom while being spaced from an inner peripheral surface () of the tappet skirt and extend substantially parallel to the longitudinal direction of the tappet skirt, the contact surface being arranged on a second section () of the tappet bottom connecting the first sections to each other.

Mechanical roller tappet for an internal combustion engine

A mechanical tappet () is provided, in particular for actuating the lifting of a pump piston () of a fuel pump of an internal combustion engine, with a sleeve-shaped tappet housing () constructed as a shaped sheet-metal part and with a driving roller () supported so that it can rotate. Here, a bolt () supports the driving roller so that it is centered, and end sections () of the bolt projecting from the driving roller are supported in bolt eyes () of the tappet housing.

Growing community of inventors

Herzogenaurach, Germany

Karsten Kucht