Abstract:
Embodiments of a piston ring reduce the volume of a crevice defined between the circumferential wall of a cylinder and a portion of the outer wall of a piston within the cylinder, the portion extending down from the top of the piston. The piston ring is configured such that pressurized fluid within the cylinder reliably urges a radial face of the piston ring to sealingly engage the circumferential wall of the cylinder, even as the piston reciprocates within the cylinder.
Abstract:
The present invention relates to a piston ring (1) and to a process for deposition of a coating capable of guaranteeing a variable thickness of the coating layer (5) on the external surface (2) of the piston ring (1) such that a region in the vicinity of the ends (31, 32) of a gap (3) of the ring (1) comprises a coating layer (5) that is thicker than the coating layer in the opposite region in the vicinity of the ends (31, 32) of the ring (1) and, furthermore, with a reduction in the thickness of the coating layer (5) of the ends (31, 32) of the gap (3) of the ring (1), thus providing a piston ring (1) with a high level of durability owing to the excellent strength and to the high level of thickness in the region of greatest wear of the ring.
Abstract:
A wear ring for a piston of a die-casting apparatus comprises an annular body having a gap extending therethrough. The gap is configured to define at least two circumferentially offset pairs of circumferentially spaced apart facing surfaces. The facing surfaces of each pair are angled and configured to contact each other in a flush manner when the wear ring is circumferentially compressed.
Abstract:
The present invention relates to a piston ring for use in the piston of an internal combustion engine or compressor, having a substantially annular shape defining an inner face (2) that faces the raceway, a top face (3) that faces the combustion chamber and is substantially orthogonal to the top face (2), and a bottom face (4) substantially opposite to the second face (3), a heat-insulating coating layer (P) being provided on at least part of the surface of the inner, top or bottom face (2, 3, 4).
Abstract:
The invention provides a dykes-type piston ring (20) having a finished outer diameter and negligible tangential tension. The method includes the steps of machining a stock bar to an initial outer diameter slightly greater than the finished outer diameter of the piston ring (20), finishing the initial outer diameter of the stock bar to a rounded profile having a nominal diameter equal to the finished outer diameter, and machining the stock bar to the preferred cross-section. Dykes-type piston rings can have keystone or semi-keystone shaped cross- sections. The method continues by detaching the piston ring (20) from the stock bar using a parting tool in response to completing all tension inducing operations including the steps recited above. The method continues with the steps of lapping the piston ring to a final longitudinal thickness (48) and cutting the piston ring longitudinally to form a final gap (50).
Abstract:
Die Erfindung betrifft ein Gehäuse, insbesondere ein Gehäuse einer Mühle zum Mahlen oder zum Mahltrocknen von organischen Rohstoffen wie Steinkohle oder Braunkohle. Das Gehäuse trennt einen Innenraum von einem Außenraum, wobei durch die Gehäusewand eine Welle hindurchgeführt ist. Erfindungsgemäß ist die Welle zur Abdichtung von einem Kolbenring umgeben, der mit seinen an Umfangs- und Stirnfläche ausgebildeten Anlageflächen an Welle und Gehäuse anliegt. Er dichtet den Spalt zwischen Welle und Gehäuse ab und verhindert damit auch bei einer Explosion im Innenraum ein Entweichen von Flammen oder Überdruck zwischen der Welle und dem Gehäuse nach außen. Die bei der Explosion im Innenraum entstehende Druckerhöhung wird erfindungsgemäß dazu benutzt, den Anlagedruck zwischen dem Kolbenring und seiner Gegenfläche an Welle beziehungsweise Gehäuse zu erhöhen, und damit die Dichtwirkung im kritischen Moment zu verbessern. Es ergibt sich damit eine optimale Dichtwirkung bei minimalem Verschleiß.