Abstract:
The design and construction of past articulated pistons has failed to include the most efficient cooling reservoir for conducting heat from the piston to the coolant. The present invention overcomes these problems by using an annular cooling recess (82) of a precisely defined cross sectional shape and volume and a baffle plate (96) fixedly sealingly attached in heat conducting relationship to the piston member (24) to form a cooling gallery (86). The baffle plate (96) has an opening (92) therein and an upwardly extending raised portion (90) to preestablish a trapped volume of coolant therein. The assembly, positioning of the plate (96) and the preestablished trapped volume insures high efficiency of the coolant to absorb heat through the scrubbing action of the coolant on the recess (82) and the heat absorbed by the trapped coolant because of the heat conducting relationship of the plate (96) and the piston member (24).
Abstract:
A cooled two-piece trunk piston for internal combustion engines has a cast or pressed upper part that contains the piston ring groove and the piston pin hub, as well as a rod hingedly connected to the upper part exclusively by means of a piston pin. The upper part (1) is provided with a radial cooling oil channel (3) closed on all sides by the base material of the upper part of the piston, inside the ring groove section, into which the cooling oil is introduced in any appropriate manner and from which it is evacuated through at least one cooling oil outlet (5, 6) arranged in the direction of the piston pin between the piston pin hubs of the upper part of the piston. The cooling oil outlet(s) (5, 6) open into the free inner space of the rod (2). An oil collector (7, 8) arranged underneath the cooling oil outlet(s) (5, 6) is formed in the upper area of the rod (2) and directs the oil coming out the outlet towards the centre of the bottom of the upper part (1) of the piston.
Abstract:
In a two-stroke engine a sleeve-like extension (B) of the piston crown reciprocates into and out of a matching recess (D) in the cylinder head (C) in a manner analogous to a reciprocating sleeve valve. Approaching bottom-dead-centre the extension (B) is withdrawn from the recess (D) allowing air compressed in the crankcase to pass through the hollow piston (A) and extension (B) and scavenge the annular working space (E) into a surrounding toroidal scavenge belt (H). A system for direct induction of liquid fuel into the working space (E) is also diclosed.
Abstract:
A composite piston structure (10) and a method of making same. A piston member (15), carrier member (16), and ceramic facing member (14) are formed, the piston member (15) being comprised of a material selected from plastic and metal having a density of less than .15lb/in , the ceramic facing member (14), preferably comprised of a material selected from zirconia and aluminia, and carrier member (16) preferably comprised of a material selected from stainless steel and cast iron. The carrier member material has a coefficient of thermal expansion differing from the coefficient of thermal expansion of the ceramic by up to 2.0 x 10 in/in/ F. An annular grooved wall (18) is defined in the side surface of the piston member (15) and disposed at a location radially opposite a portion of the carrier member (16) when the latter is wrapped about the top of the piston member (15). A high energy beam is directed across a zone (29) of the carrier member (16) that is radially aligned with the grooved wall (18) and deployed to melt a portion of the carrier member (16) intersected by the beam, causing the melted material to flow into the grooved wall (18) to fill same and lock the piston member (15) to the carrier member (16), upon solidification, for conjoint movement.
Abstract translation:复合活塞结构(10)及其制造方法。 形成活塞构件(15),承载构件(16)和陶瓷面对构件(14),活塞构件(15)由选自塑料和金属的材料组成,密度小于0.15lb / 陶瓷面对构件(14)优选地由选自氧化锆和氧化铝的材料组成,并且载体构件(16)优选地由选自不锈钢和铸铁的材料组成。 载体构件材料的热膨胀系数与陶瓷的热膨胀系数不同,为2.0×10 -6 in / in /°F。 环形沟槽壁(18)限定在活塞构件(15)的侧表面中,并且当其围绕活塞构件(15)的顶部缠绕时,被布置在与承载构件(16)的一部分径向相对的位置处 )。 高能量束被引导穿过承载构件(16)的与凹槽壁(18)径向对准的区域(29)并展开以熔化由梁相交的载体构件(16)的一部分,从而使 熔化的材料流入有槽的壁(18)以填充相同的并且在固化时将活塞构件(15)锁定到载体构件(16)上,用于联合运动。
Abstract:
A piston for an internal combustion engine is provided. The piston includes a piston body which is made of steel. The piston body has a crown portion with an upper combustion surface, a pair of skirts which depend from the crown surface, a pair of pin bosses for receiving a wrist pin and a plurality of pin boss bridges which extend from the pin bosses to the skirts. Each of the pin boss bridges extends axially to a lower end which is opposite of the crown portion and has a rib with an increased thickness at its lower end. At least one of the pin boss bridges has a generally flat counter-bore surface for providing a reference location for machining of the piston body.
Abstract:
Die Erfindung betrifft einen Kolben einer Brennkraftmaschine, der gemäß seiner Herstellung einen einteiligen Kolben (1a) bildet und der ein Kolbenoberteil (2a) und ein Kolbenunterteil (3a) umfasst, die über korrespondierende, jeweils eine Fügezone (8a,9a) bildende Fügestege (4a,5a; 6a,7a) abgestützt und mittels einer multiorbitalen Reibschweißung stoffschlüssig verbunden sind. Die jeweils unmittelbar in Verbindung stehenden Fügestege (4a,5a) bzw. (6a,7a) weisen dabei eine weitestgehend übereinstimmende Wandstärke S1, S2 auf. Der Kolben (1a) schließt eine Brennraummulde (15a) sowie zumindest einen Kühlkanal (18a) ein, die zentrisch oder exzentrisch in dem Kolben (1a) eingebracht sind. Die Brennraummulde (15a) sowie der Kühlkanal (18a) bilden dabei eine kreisrunde oder von einer Kreisform abweichende Kontur.
Abstract:
The invention relates to a piston (10, 110, 210) for a combustion engine, having a piston main body (11, 111, 211) and a piston ring element (12, 112, 212), wherein the piston main body (11, 111, 211) has at least one inner region (14) of a piston crown (13) and a piston skirt (16) that is provided with pin hubs (18) having hub bores (17), wherein the piston ring element (12, 112, 212) has at least one outer region (21) of a piston crown (13) having a circumferential top land (22) and a circumferential ring part (23) provided with annular grooves (24). According to the invention the piston main body (11, 111, 121) and the piston ring element (12, 112, 212) are joined together by means of corresponding conical joint surfaces (32, 33, 27, 28; 135, 136; 232, 233, 227, 228) formed thereon. The invention further relates to a method for producing such a piston.
Abstract:
Die vorliegende Erfindung betrifft einen Kolben (10, 110, 210) für einen Verbrennungsmotor, mit einem Kolbengrundkörper (11, 111, 211 ) und einem Kolbenringelement (12, 112, 212), wobei der Kolbengrundkörper (11, 111, 211) zumindest einen inneren Bereich (14) eines Kolbenbodens (13) sowie einen Kolbenschaft (16) aufweist, welcher mit Nabenbohrungen (17) aufweisenden Bolzennaben (18) versehen ist, wobei das Kolbenringelement (12, 112, 212) zumindest einen äußeren Bereich (21 ) eines Kolbenbodens (13) mit einem umlaufenden Feuersteg (22) und einer mit Ringnuten (24) versehenen umlaufenden Ringpartie (23) aufweist. Erfindungsgemäß ist vorgesehen, dass Kolbengrundkörper (11, 111, 211) und Kolbenringelement (12, 112, 212) über an ihnen ausgebildete korrespondierende, kegelförmige Fügeflächen (32, 33, 27, 28; 135, 136; 232, 233, 227, 228) zusammengefügt sind. Die vorliegende Erfindung betrifft ferner ein Verfahren zur Herstellung eines derartigen Kolbens.