Abstract:
Cet élément comprend un corps annulaire (9) équipé de deux séries de pions (10, 12) dépassant d'au moins un côté du corps (9), les pions (10) d'une première série étant engagés dans des rainures (7) de la volute fixe (3) et les pions (12) d'une seconde série étant engagés dans des rainures (8) de la volute mobile (4), pour assurer un mouvement orbital de la volute mobile (4) par rapport à la volute fixe (3) les faces de contact des pions (10, 12) d'une même série avec les parois des rainures de la volute correspondante étant parallèles et les faces de contact des pions (10, 12) appartenant à deux séries de pions étant perpendiculaires. Le corps annulaire (9) est réalisé en un premier métal d'une densité déterminée et les pions sont réalisés en un second métal ayant une densité inférieure à celle du premier métal.
Abstract:
Ein Unterteil eines gebauten Kolbens soll auf einfache Weise mit ausreichender Schaftlänge hergestellt werden. Hierzu weist das Unterteil die folgenden Merkmale auf: - das Unterteil (1) besteht aus zwei miteinander verschweissten oder verlöteten Hälften (2,3), - die Trennebene in Druck-Gegendruckrichtung, - die beiden Hälften (2,3) bestehen aus fliessgepresstem oder geschmiedetem Stahl, - in Bolzenrichtung ist der Schaft (5) nach Art eines Kastenkolbens gegenüber dem Kolbendurchmesser zurückgenommen.
Abstract:
A free piston internal combustion engine (10) includes a combustion cylinder (16) having a substantially cylindrical inside surface (68). A piston (14) which is reciprocally disposed within the combustion cylinder (16) includes a piston head (32) and a plunger rod (34). The plunger rod (34) is attached to the piston head (32) and has a longitudinal axis (60). The piston head (32) includes a non-metallic cap (62) and a metallic skirt (64). The cap (62) has a substantially cylindrical outside surface (66) lying closely adjacent to and defining a bearing surface with the inside surface (68) of the combustion cylinder. The cap (62) is substantially immovably attached to the skirt (64) in a direction parallel to the longitudinal axis (60) of the plunger rod (34), and is movably attached to the skirt (64) in a radial direction relative to the longitudinal axis (60) of the plunger rod (34).
Abstract:
A piston (20) for an internal combustion engine includes an upper crown (22) and a lower crown (24) that are each fabricated using a same strong material, such as steel and fastened together using a plurality of fasteners (50). The piston (20) provides increased strength resulting in improved design flexibility and smaller sized engines that produce the same amount of power. Piston ring grooves (100, 102, 104) are also provided in either one or both of the upper and lower crowns (22, 24) which control piston combustion height. A deeper combustion bowl (72) is also available with the piston (20).
Abstract:
A carbon piston engine having a lower side (112) that forms a domed surface, preferably an ellipsoid surface, in the area between the enlargements of the hub (151) irrespective of the design of the lower side of the piston head, whereby said domed surface is adjacent to the enlargements of the hub. The skirt (104) of the piston has an axial profile in the form of a conical surface with straight-line generatrixes, tapering upwards as it comes into contact with the ring section.
Abstract:
The invention relates to a piston built in three parts, in which the base and shaft are connected only by means of the piston pin in the manner of a pivoted piston. The aim of the invention is to avoid a complicated shape of the shaft and upper part. To this end the shaft has at its upper end a guide element for the piston base at least in the direction of pressure and counterpressure.
Abstract:
A movable wall member in the form of an exhaust valve spindle (1) or a piston (7) in an internal combustion engine is on the side of the wall member facing a combustion chamber provided with a hot-corrosion-resistant material (5, 14) made from a particulate starting material of an alloy containing nickel and chromium which by a HIP process has been unified to a coherent material substantially without melting the starting material. The corrosion-resistant material has a hardness of less than 310 HV measured at approximately 20 DEG C after the material has been heated to a temperature within the range of 550-850 DEG C for more than 400 hours.
Abstract:
A piston for use on endothermic motors, compressors and pumps, featuring a configuration formed by several parts (2, 3) for the assembly of entire seal rings (10), as well as the eventual use of optimal materials for each one of its specific working areas, to reduce its weight and improve its efficiency.
Abstract:
The invention concerns a light-metal piston which has a sheet-metal cooling channel integrally cast in the piston head. In order to improve the heat transfer between the piston material and the cooling channel and to reduce the manufacturing costs of the cooling channel, the channel has a narrow slit, which allows oil to pass, extending along at least part of the channel wall.
Abstract:
A piston for diesel engines is made of a toughness-increasing aluminium alloy containing copper, nickel, silicon, magnesium, iron and manganese. The use of this material, which can conventionally be chill-cast, and by applying special dimensions, provides a piston which, despite its relatively light construction, provides the utmost security against cracking in the stressed regions, e.g. the piston boss or the combustion chamber recess.