Federal-mogul Burscheid Gmbh

Fabian Ruch

Richard Mittler

Dirk Bärenreuter

Nigel Gray

Stephan Machliner

Jörn Pröpper

Jurgen Gillen

Oliver Nickisch

Jürgen Gillen

An oil scraper ring is provided for pistons () of an internal combustion engine having an oil scraper piston ring groove () formed without at least one oil drain bore. The scraper ring includes a ring body () comprising an upper ring flank (), a lower ring flank (), a ring inner side (), a ring outer side () and two abutting surfaces (). An upper oil scraper rail () and a lower oil scraper rail () extend in the circumferential direction in spaced apart relation from one another in the axial direction and extend radially to the outside from the ring outer side () are arranged on the ring outer side (). Oil passages () running in the radial direction are arranged in a region between the upper scraper rail () and the lower scraper rail (), and at least one groove () extends in the radial direction on the lower ring flank ().

Oil scraper ring for pistons of an internal combustion engine

A piston ring system for an internal combustion engine includes a first compression piston ring (), a second compression piston ring (), and an oil scraper piston ring (). The first compression piston ring () has a first ring body () with a first upper ring flank (), a first lower ring flank (), a first ring inner side (), a first ring outer side (), as well as two first abutting surfaces. A first contact region () of the first ring body () is arranged with a cylinder running surface () above a first piston ring center (). At least one first oil pocket () is arranged below the first contact region () in the circumferential direction. The second compression piston ring () having a second ring body () a second upper ring flank (), a second lower ring flank (), a second ring inner side (), a second ring outer side (), as well as two second abutting surfaces. A second contact region () of the second ring body () is arranged with the cylinder running surface () above or below a second piston ring center (). At least one second oil pocket () is arranged below the second contact region () in the circumferential direction. The oil scraper piston ring () is formed in one piece, two pieces, or three pieces.

Piston ring system for an internal combustion engine with direct water injection

A piston ring with improved wear properties has a running surface, an upper ring flank, a lower ring flank, and an inner surface. The piston ring has a radius R, and wherein in a radial section, a running surface contour includes an upper region, a central region, and a lower region. The upper region of the running surface contour has a curvature radius R, which lies between the ring radius R and infinity. The central region of the running surface contour has a curvature radius R, which lies between the ring radius R and infinity. The lower region has a curvature radius R, which is smaller than the ring radius R.

Piston ring and piston ring/piston combination with improved wear properties

A piston ring has a running surface, an inner surface, a lower ring flank, and an upper ring flank. A recess, extending across the perimeter in the shape of an internal angle, is located at the transition between the inner surface and the upper ring flank. The recess defines a conical first surface and a conical second surface at the piston ring. The first surface lies farther outward, when viewed in the radial direction, and farther above, when viewed in the axial direction, than the second surface. In an axial cross section, a first angle between the axial direction and the first surface lies in the range between 10&#xb0; and 50&#xb0;, and a second angle between the radial direction and the second surface lies in the range between 5&#xb0; and 30&#xb0;. A piston having a piston ring groove includes a projection on the groove bottom. A combination made from an above-mentioned piston ring and an above-mentioned piston are adapted to one another, so that the projection projects into the recess.

Piston ring and piston with internal groove sealing

A stepped piston ring () includes a ring outer side (), an upper ring flank (), and a lower ring flank (). The ring outer side () on the upper edge has a notch (, so that only a lower portion of the ring outer side () forms a contact surface ().

Piston ring having a stepped running surface

A three-piece piston oil control ringhas an upper, disc-shaped scraping ring, a lower, disc-shaped stabilising ring, and a circular expanderwhich has projectionsprotruding in the axial direction on an inner face. The circular expanderis arranged between the upper scraping ringand the lower stabilising ring, wherein the projectionseach bear inwardly against an inner faceof the scraping ringor against an inner faceof the stabilising ring. An outer radiusof the scraping ringis greater than an outer radiusof the lower stabilising ring, so that there is a radius difference &#x3b4; between the scraping ringand the stabilising ring

Multiple-piece oil stripping piston ring with reduced friction

A compression piston ring is provided, in particular a piston ring suitable as a second piston ring in a three-ring piston ring set, which piston ring has convex sections and concave sections alternating in the circumferential direction in a middle running face region in relation to the axial height, wherein the concave sections form profile recesses in the convexly crowned running face.

Compression oil control piston ring

A one-piece control ring with two stripping ridges and openings that extend from the outside of the ring to the inside is provided wherein the cross section of the ring body varies in the circumferential direction. This variation is achieved with internal grooves, the cross-sectional area of which decreases in the direction of the back of the ring, and with a variation of the depth of the groove lying between the ridges.

One-piece oil control ring

An oil wiper ring is provided having two circumferential shoulders, the running surfaces whereof are outwardly curved, wherein the shoulder of the combustion chamber side has an axial height greater by at least a factor of 2 than the axial height of the shoulder on the crankcase side and wherein the should on the combustion chamber side has an asymmetrical crowning.

Two part oil control ring having oil pressure effect ridges

The present invention relates to a two-part oil scraper ring, which comprises an L-shaped base body and an axial stabilization element. The L-shaped base body has a ring flank leg, which is pressed against a piston ring groove flank by the axial stabilization element, and a bearing surface leg, on which a scraping web is arranged. A twist compensation is attained by means of a suitable selection&#x2014;and in particular variation&#x2014;of hearing surface leg length, ring flank leg length and axial position of the scraping web.

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Leverkusen, Germany

Fabian Ruch