Abstract: Provided is a provides a method for producing hydrogen peroxide, comprising a step of reducing and then oxidizing a working solution containing an organic solvent, anthraquinone having an alkyl substituent, and tetrahydroanthraquinone having an alkyl substituent to produce hydrogen peroxide; and a working solution regeneration step of removing an inert substance, generated as a sub product by the production of hydrogen peroxide, from the working solution and re-circulating the working solution deprived of the inert substance back into the step of producing hydrogen peroxide; wherein the working solution regeneration step includes i) a first distillation step of recovering the organic solvent by distillation performed at an atmospheric or a lower pressure; and ii) a second distillation step of, following the first distillation step, recovering the anthraquinone and the tetrahydroanthraquinone by distillation performed at a still lower pressure at 200° C. or higher for a residence time of 1 hour or longer.

Abstract: A squish surface having the shape of a plane surface orthogonal to the axis of a piston is formed on the intake side of the piston top surface. A squish area is formed between the squish surface and a plane surface-shaped squish surface on the cylinder head side, and at the same time, a squish guide surface is formed in the piston top surface so as to be continuously ridged from the squish surface toward the vicinity of a spark plug.

Abstract: There is provided a V-type engine in which banks of an engine block are offset in the same direction as the rotational direction of a crankshaft so that the banks may be displaced toward an end of a vehicle body. On the offset side, engine accessory is mounted on a side of the engine block and below the banks. The width between the end of the engine accessory to which an impact is input first among component parts of the engine block and the end of the rear bank where the engine block moved due to the impact is abutted first on a vehicle body member is set to be shorter than in a conventional engine. Therefore, the crushable zone may be increased even in a limited engine compartment.

Abstract: A squish surface having the shape of a plane surface orthogonal to the axis of a piston is formed on the intake side of the piston top surface. A squish area is formed between the squish surface and a plane surface-shaped squish surface on the cylinder head side, and at the same time, a squish guide surface is formed in the piston top surface so as to be continuously ridged from the squish surface toward the vicinity of a spark plug.

Abstract: There is provided a V-type engine, in which deck cylinder parts of a cylinder block are offset in the same direction as a rotational direction of a crankshaft, and oil separation chambers are provided at an upper portion of the cylinder head displaced to a lower side by the offset. Therefore, an allowance in the axial direction of cylinders may be provided above a cylinder head of the deck cylinder parts on the lower side, and the capacity of the oil separation chambers is increased by the allowance so that the oil separation performance may be improved, while an increase in the total width and total height of an engine block is suppressed.

Abstract: There is provided a V-type engine, in which deck cylinder parts of a cylinder block are offset in the same direction as a rotational direction of a crankshaft, and oil separation chambers are provided at an upper portion of the cylinder head displaced to a lower side by the offset. Therefore, an allowance in the axial direction of cylinders may be provided above a cylinder head of the deck cylinder parts on the lower side, and the capacity of the oil separation chambers is increased by the allowance so that the oil separation performance may be improved, while an increase in the total width and total height of an engine block is suppressed.

Abstract: There is provided a V-type engine in which banks of an engine block are offset in the same direction as the rotational direction of a crankshaft so that the banks may be displaced toward an end of a vehicle body. On the offset side, engine accessory is mounted on a side of the engine block and below the banks. The width between the end of the engine accessory to which an impact is input first among component parts of the engine block and the end of the rear bank where the engine block moved due to the impact is abutted first on a vehicle body member is set to be shorter than in a conventional engine. Therefore, the crushable zone may be increased even in a limited engine compartment.