A radial engine-generator includes an electric power generator and a radial engine. The radial engine-generator can be a mobile and portable unit, and is employable as a primary or back-up source of electric power at data centers, manufacturing facilities, electric vehicle charging stations, medical facilities, telecommunications, and residential neighborhoods, among many other applications. The electric power generator and radial engine are coupled together. The radial engine includes, among other components, multiple cylinders, multiple cylinder heads, and multiple overhead camshaft assemblies. The overhead camshaft assemblies are located at the cylinder heads and each include one or more camshafts. The camshaft(s) receive rotational drive input from a crankshaft of the radial engine. In certain implementations, camshaft carrier assemblies can be provided to support components of the overhead camshaft assemblies.

There is provided a variable valve device provided in a cylinder head and capable of changing a valve lift amount, including: a camshaft on which a plurality of cams with different valve lift amounts are formed; a switching mechanism configured to switch a cam for moving a valve among the plurality of cams; and an oil control valve configured to control an oil pressure for the switching mechanism. Oil starts to be supplied from the oil control valve to the switching mechanism at an end timing of a valve lift or in a zero range in which no valve lift occurs.

An exhaust valve opening apparatus such as for an engine compression braking system includes a rocker shaft for supplying control fluid to an controllable valve and for distributing the control fluid to a primary and second piston arrangement that selectively opens an exhaust valve in response to the control fluid being pressurized.

Provided is a valve control apparatus for an engine that opens and closes an exhaust valve and intake value of the engine while rotating in conjunction with a crankshaft of the engine, the valve control apparatus including an exhaust valve opening and closing device opening and closing the exhaust valve during a first exhaust valve opening period and an intake valve opening and closing device opening and closing the intake valve during a first intake valve opening period.

In an internal combustion engine that includes a cylinder block and a cylinder head, and has a cam chain chamber on a side of the cylinder block, a beam member that traverses the cam chain chamber is disposed in the cam chain chamber.

A camshaft includes, as a cam that opens and closes an exhaust valve and an intake valve, a ball cam whose protrusion amount changes according to rotation of the camshaft, wherein the camshaft has a double structure consisting of an inner shaft and an outer shaft provided in a manner that the inner shaft is helically displaced with respect to the outer shaft around an axis of the camshaft according to a rotation speed of the camshaft, and the ball cam is accommodated movably in a guide groove provided in the inner shaft and protrudes from the outer shaft, and a protrusion amount of the ball cam from the outer shaft changes when the ball cam moves in the guide groove due to the helical displacement of the inner shaft with respect to the outer shaft.

An internal combustion engine includes at least one cylinder crankcase, at least one cylinder head (1), at least one overhead camshaft (2), at least two rocker arms (3) which are driven by the camshaft (2) and actuate the combustion valves, the camshaft(s) (2) being mounted in the cylinder head housing, and an oil supply line (9) which is situated in particular in the area of the top face of the cylinder head (1) for lubricating camshaft bearing brackets (10) and the rocker arm brackets (11).

An installation tool installs a camshaft to a lower supporting portion. A cylinder head of an internal combustion engine includes the lower supporting portion, a cam holder, and a half-thrust washer. The camshaft is sandwiched between the cam holder and the lower supporting portion via a bearing. The half-thrust washer is inserted into respective annular groove disposed in an outer peripheral surface of the bearing and half annular groove disposed in the cam holder. The installation tool includes a bearing holder that holds the bearing, a head abutting portion abutted against a reference surface of the lower supporting portion with the bearing held, and an opposed concave knock portion into which a knock collar disposed in the cam holder is inserted to adjust a position of the half annular groove with respect to the half-thrust washer.

An OHV engine includes V-shaped banks, a crank shaft, a cam shaft connected to the crank shaft, a mechanical supercharger located between the V-shaped banks, and a power transmission supported by the cam shaft and that connects the crank shaft to the mechanical supercharger. The power transmission includes a gear mechanism with a gear ratio not greater than a predetermined value, and includes a first gear supported rotatably by the cam shaft and that rotates based on an output from the crank shaft, a second gear provided on a rotation shaft of the mechanical supercharger, and an idle gear that connects the first and second gears with each other. Cylinders are offset with respect to a center of the crank shaft on an anti-thrust side of the cylinders, and the mechanical supercharger is also offset with respect to a center of the crank shaft on the anti-thrust side. Cylinder heads are provided with oil cooling paths adjacent respective spark plugs.

Methods and systems are provided for adjusting engine cranking. In one example, a method for an engine cold start may include extending engine cranking at least based on one or more engine cold start conditions, where extending engine cranking may increase an engine oil pressure in a plurality of camshaft phaser cavities of a variable camshaft timing (VCT) phaser. In some examples, the method may further include, after engine cranking, enabling fueling. In this way, fuel efficiency considerations may be balanced with increases to the engine oil pressure such that components of the VCT phaser may be actuated and/or lubricated.