Abstract: The present invention provides a piston for a spark-ignition engine, comprising: a land part 18, an upper surface part of which has a crown part 26 forming a combustion chamber; a pair of skirt parts 20 extending downward from a peripheral part of the land part 18 and facing each other in a radial direction thereof; a pair of sidewall parts 19 coupling side end parts of the pair of skirt parts 20 to each other; and a pin boss part 21 that is formed in each of the sidewall parts 19. The present invention can inhibit the generation of HC produced at the time of combustion, while thermally protecting a top ring 30 fitted into a top ring groove 24a on an outer circumferential surface of the land part 18. The crown part 26 is configured by a flat base surface 27 and a bulging part 15 bulging upward above the base surface 27, and a thinned part 40 provided in the land part 18 is formed deep such that the deepest part thereof is positioned inside the bulging part 15.

Abstract: The present invention provides a piston for a spark-ignition engine, comprising: a land part 18, an upper surface part of which has a crown part 26 forming a combustion chamber; a pair of skirt parts 20 extending downward from a peripheral part of the land part 18 and facing each other in a radial direction thereof; a pair of sidewall parts 19 coupling side end parts of the pair of skirt parts 20 to each other; and a pin boss part 21 that is formed in each of the sidewall parts 19. The present invention can inhibit the generation of HC produced at the time of combustion, while thermally protecting a top ring 30 fitted into a top ring groove 24a on an outer circumferential surface of the land part 18. The crown part 26 is configured by a flat base surface 27 and a bulging part 15 bulging upward above the base surface 27, and a thinned part 40 provided in the land part 18 is formed deep such that the deepest part thereof is positioned inside the bulging part 15.

Abstract: A steel-pipe sheet pile including a steel pipe and joints for coupling the steel pipe to another steel pipe and multiple steel pipes arranged in a building direction of a steel-pipe sheet pile wall, wherein the joints include a male joint and a female joint each made of an H-shaped steel-beam coupled at flange edges to the steel pipe, and wherein the male joint is slightly smaller in size relative to the female joint so that the male joint can be fitted in a space defined by flange inside surfaces and web surface of a female joint of a neighboring steel-pipe sheet pile. The steel-pipe sheet pile is a joined-steel-pipe sheet pile including multiple steel pipes integrally coupled to one another via H-shaped steel-beams as tying members of H-shaped transverse cross-section.

Abstract: A steel-pipe sheet pile including a steel pipe and joints for coupling the steel pipe to another steel pipe and multiple steel pipes arranged in a building direction of a steel-pipe sheet pile wall, wherein the joints include a male joint and a sale joint each made of an H-shaped steel-beam coupled at flange edges to the steel pipe, and wherein the male joint is slightly smaller in size relative to the female joint so that the male joint can be fitted in a space defined by flange inside surfaces and web surface of a female joint of a neighboring steel-pipe sheet pile. The inside surfaces of the flanges of the female joint and the outside surfaces of the flanges of the male joint are provided with projections, respectively.

Abstract: A power controller comprises: a first control signal generator operable with a second power voltage for generating a first control signal; a first reference voltage generator operable with a first power voltage for generating a first reference voltage corresponding to a difference between the first and second power voltages; a first level converter coupled with the first control signal generator for receiving the first control signal, the first level converter coupled with the first reference voltage generator for converting the first control signal into a first level-converted control signal with a voltage level range between the first power voltage and the difference between the first and second power voltages; and a first driver coupled with the first level converter for receiving the first level-converted control signal, and the first driver driving an external load with the first level-converted control signal.

Abstract: A power controller comprises: a first control signal generator operable with a second power voltage for generating a first control signal; a first reference voltage generator operable with a first power voltage for generating a first reference voltage corresponding to a difference between the first and second power voltages; a first level converter coupled with the first control signal generator for receiving the first control signal, the first level converter coupled with the first reference voltage generator for converting the first control signal into a first level-converted control signal with a voltage level range between the first power voltage and the difference between the first and second power voltages; and a first driver coupled with the first level converter for receiving the first level-converted control signal, and the first driver driving an external load with the first level-converted control signal.