Disclosed is an internal combustion engine's piston with a piston head having first and second thinnest portions that are thinnest in thickness of the piston head. With respect to the center axis of the first and second pin holes for supporting the piston pin, the first and second thinnest portions of the piston head are respectively provided on both sides of a transverse axis that is perpendicular to the center axis of the first and second pin holes. Each of first and second rib portions that are respectively formed on inner surfaces of first and second pin boss portions extends at the piston head in a direction along the transverse axis to overlap each of the first and second thinnest portions of the piston head. This piston is capable of relaxing stress concentration at a position above the piston pin.

A piston with a cooling gallery containing an open cell radiator is provided. The radiator has a large thermally conductive surface area that acts as a heat-sink to remove heat from the piston. Heat from the piston is transmitted from the radiator to cooling oil that enters the cooling gallery via an oil inlet formed in a floor of the cooling gallery and exits the cooling gallery via an oil outlet. The piston comprises a piston body including an upper part presenting an upper combustion surface and an undercrown surface. A ring belt depends from the upper combustion surface, and the cooling gallery extends around the piston body beneath the undercrown surface radially inwardly of the ring belt. The radiator includes a plurality of fins extending annularly around the cooling gallery. The fins of the radiator are spaced from one another by gaps extending annularly around the cooling gallery.

A piston for a two-stroke engine operating with advanced scavenging has a piston base and a piston skirt. The piston has a piston pocket which has a smallest distance (e) from a top side of the piston base. The piston has a section plane perpendicularly to the longitudinal center axis of the piston, the distance of which section plane from the top side of the piston base is greater than the smallest distance (e). A middle plane of the piston intersects the piston skirt at a location. In the circumferential direction between the pocket and this location, a thickened area is arranged in the section plane, the greatest wall thickness of which area is at least 1.1 times the wall thickness at the location. The piston has an edge at a recess at which the piston skirt has a reduced height. A chamfer is arranged on the radially outer side of the piston.

A steel piston for heavy-duty diesel engines designed with features that increase adiabaticity, reduce weight, and improve passive cooling without loss of power density is provided. The piston includes a pair of skirt walls extending longitudinally from a crown to a lower end. The skirt walls include a plurality of heat sink wells extending axially from the crown to a lower end of the skirt wall. Each heat sink well is at least partially filled with a cooling medium and is sealed. The piston also includes a plurality of ribs each radially aligned with one of the heat sink wells and extending inwardly and upwardly from a first rib end at an inner surface of the skirt wall to a second rib end at the inner surface of the crown.

A piston for an internal combustion engine is provided. The piston includes a piston body of steel and including a crown portion, a pair of skirt portions and a pair of pin boss panels. The crown portion has an upper combustion surface, a lower surface having an undercrown surface area and an outer annular ring belt with at least one ring groove. The pin boss panels depend from the crown portion and extend in spaced relationship with one another between the skirt portions. Each pin boss panel includes a pin boss having a pin bore, and the pin bores are aligned with one another for receiving a wrist pin. Each pin boss panel also has at least one recess located vertically between the associated one of the pin bores and the crown portion to increase the undercrown surface area for improved cooling of the crown portion.

Disclosed is an engine piston structure including an outer peripheral portion (6) formed along an outer shape of a piston (1), and having a predetermined thickness, a pair of piston pin supporters (7) having peripheral walls (7b) having a predetermined thickness, and couplers (8) each coupling the pair of the piston pin supporters (7) to the outer peripheral portion (6). The outer peripheral portion (6) and the peripheral walls (7b) of the piston pin supporters (7) are solid. Each of the coupler (8) is porous. The outer peripheral portion (6), the piston pin supporters (7), and the couplers (8) are made of a metal material and are integrally formed together.

The invention relates to a piston (10) for an internal combustion engine, comprising a piston crown (22), a cylindrical piston head (11), which adjoins the piston crown (22), and an at least partially hollow piston skirt (40), which is formed on the piston head (11) on the side facing away from the piston crown (22) and which has two opposite skirt wall segments (50) and two opposite connecting walls (60) that connect the skirt wall segments (50), wherein the connecting walls (60) each have a pin bore (61), wherein the piston head (11) has an annular cooling channel (18), which has at least one inlet opening (28) and at least one outlet opening (30), and the two skirt wall segments (50) widen toward the piston head (11) in such a way that the sector length (L1) of the side of the skirt wall segment (50) formed on the piston head (11) is greater than the sector length (L2) of the side of the skirt wall segment (50) facing away from the piston head (11).

The present invention relates to compounds of general formula (I), wherein A represents an optionally substituted heterocycle group, B represents an aryl or heteroaryl group and wherein X, R1, R2, R3, R4 and R5 are as defined in the description. Compounds of formula (I) are useful to destroy, inhibit, or prevent the growth or spread of cells, especially malignant cells, into surrounding tissues implicated in a variety of human and animal diseases.

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A steel piston for coupling to a connecting rod and wrist pin is provided. The piston includes a body with an upper crown presenting a combustion surface for exposure to a combustion chamber. The upper crown presents an undercrown surface which is openly exposed as viewed from an underside of the piston and not bounded by a cooling gallery. The body includes a ring belt and pin bosses depending from the ring belt and presenting a pin bore for receiving the wrist pin. The body also includes ribs disposed along the undercrown surface. The body includes a ratio of compression height to outer diameter (CH/D) ranging from 34.8% to 42.0%. The piston also includes a low heat transfer coating on the combustion surface, and the low heat transfer coating has a thermal conductivity of about 0.20 to 0.80 W/m.Math.K.

A piston of an internal combustion engine is provided and includes a piston skirt enclosing at least a portion of an underside of a piston crown. A cooling oil passageway is provided on the underside of the piston and extends from a first part to a second part of the underside, where the first part is closer than the second part to a fluid flow from a cooling oil source. The cooling oil passageway may include a main channel and a branch channel extending from the main channel at an angle.