Abstract: A cylinder block including: a plurality of cylinders; a cylinder head attached on the cylinder block and including, for each of the cylinders, an intake port extending from a combustion chamber upward and obliquely relative to an axis of the cylinder; a direct injector disposed at a position on an outer side of the intake port in a cylinder radial direction and directly injecting fuel into the combustion chamber; a port injector disposed at a position on a same side as the direct injector relative to the intake port, and injecting fuel into the intake port are provided. The intake port includes: a valve seat provided at an intake air inlet opened to the combustion chamber; and an arc portion protruding downward in a center area of the intake port on an upstream side of the valve seat, and an injection direction of the port injector is orientated in a direction in which the fuel injected from the port injector passes through a lower area of the arc portion.

Abstract: A hydraulic pump of the axial piston type comprising check valves each of which is adapted to open and allow the associated cylinder to discharge fluid when the pressure inside the cylinder has been raised above the discharge pressure of the pump by the piston on its compression stroke, passage means for communicating each of the cylinders with the low-pressure system including a pump suction pipe or drain tank during the period in which the piston on the compression stroke moves from a point at least short of the top dead center to a point past the center and where the cylinder communicates with the suction port, and pressure-reducing means disposed in the passage means.