Abstract: The present invention provides a common rail fuel injector for a diesel engine. A valve seat of a fuel injector control valve adopts a T-shaped structure with a slot hole (2001c), and liquid passes through the slot hole of the valve seat of the control valve to control hydraulic pressure at a tail portion of a needle valve. A T-shaped pilot valve seat adopts a floating mounting structure: a large end of the T-shaped control valve seat faces downwards; a long column of the T-shaped pilot valve seat is slidably assembled in a central hole of a fuel injector body; a large end of the T-shaped control valve seat and the central hole of the fuel injector body are provided with a seal seat surface matched with each other.

Abstract: Disclosed is a reciprocating piston engine, comprising a combined structure with an optimized double-crankshaft and variable compression ratio pistons, characterized in that the variable compression ratio piston is a piston serving as a double-acting hydraulic cylinder, a control valve bush of a slide-valve type directional control valve is fixed in a central mounting hole of the inner piston, and a control valve core is mounted in a rotatory sliding or nut-ball screw manner in a central mounting hole in the inner surface of the piston top; and the double-crankshaft engine is formed by two reverse rotating crankshafts which are coupled by gears to be in synchronous reverse rotation motion together, each piston being connected to a connecting rod shaft of two crankshafts, and a piston control valve driving mechanism being mounted between the two crankshafts.

Abstract: Disclosed is a reciprocating piston engine, comprising a combined structure with an optimized double-crankshaft and variable compression ratio pistons, characterized in that the variable compression ratio piston is a piston serving as a double-acting hydraulic cylinder, a control valve bush of a slide-valve type directional control valve is fixed in a central mounting hole of the inner piston, and a control valve core is mounted in a rotatory sliding or nut-ball screw manner in a central mounting hole in the inner surface of the piston top; and the double-crankshaft engine is formed by two reverse rotating crankshafts which are coupled by gears to be in synchronous reverse rotation motion together, each piston being connected to a connecting rod shaft of two crankshafts, and a piston control valve driving mechanism being mounted between the two crankshafts.