Internal combustion engine
An internal combustion engine for use with hydrogen fuel includes a cylinder assembly having a combustion chamber with a cylinder, a cylinder head, and a piston. Two inlet ports are disposed within the cylinder head, the inlet ports being closable by an inlet valve, and an outlet port within the cylinder head being selectively closable by an outlet valve. At least one spark plug is mounted to the cylinder head, and piston assembly having the piston and a crankshaft. A line passes through a center of one of the inlet ports and a center of a corresponding outlet port, with the line arranged at a non-zero angle to an axis of rotation of the crankshaft and with the line at a non-right angle to the axis of rotation. The cylinder head is secured by six fasteners, such as six bolts to an engine block defining the cylinder.
1 . An internal combustion engine for use with hydrogen fuel, the engine having at least one cylinder assembly, each cylinder assembly comprising:
a combustion chamber comprising a cylinder, a cylinder head and a reciprocating piston assembly;
two inlet ports within the cylinder head, the inlet ports being selectively closable by a corresponding inlet valve;
an inlet runner extending to the inlet ports;
at least one outlet port within the cylinder head, the at least one outlet port being selectively closable by a corresponding outlet valve;
at least one spark plug mounted to the cylinder head;
a fuel injector mounted to the cylinder head and arranged to inject hydrogen fuel into the cylinder via an injection port; and
a piston assembly comprising a piston and a crankshaft;
a line passing through a center of one of the inlet ports and a center of a corresponding at least one outlet port;
wherein the line is arranged at a non-zero angle to an axis of rotation of the crankshaft;
wherein the line is at a non-right angle to the axis of rotation of the crankshaft;
wherein the cylinder head is secured by six fasteners; and
wherein the injection port is arranged radially outward of the center of each of the inlet ports.
2 . The internal combustion engine of claim 1 , wherein the inlet runner bifurcates into a first section and a second section, the two sections each being connected to different inlet ports.
3 . The internal combustion engine of claim 2 , wherein at least one of the first and second sections of the inlet runner enters the corresponding inlet port at an angle greater than 32° with respect to a plane transverse an axis of the cylinder.
4 . The internal combustion engine of claim 2 , wherein the first and second sections of the inlet runner have non-equal lengths.
5 . The internal combustion engine of claim 1 , wherein the cylinder head is substantially planar and substantially normal an axis of the piston.
6 . The internal combustion engine of claim 1 , wherein the non-right angle between the line and the axis of rotation of the crankshaft is in the range of 45° to 55°.
7 . The internal combustion engine of claim 1 , wherein at least one of the inlet and outlet valves is located, when closed, in the corresponding port in a recessed position from an inner surface of the cylinder head.
8 . The internal combustion engine of claim 1 , wherein at least one of the inlet ports has a larger diameter than the diameter of the at least one outlet port.
9 . The internal combustion engine of claim 1 , wherein the cylinder head comprises two outlet ports and the spark plug is located in a region intermediate the inlet and outlet ports.
10 . The internal combustion engine of claim 9 , wherein the fuel injector is arranged so that the injection point is located in a region intermediate the inlet and outlet ports.
11 . The internal combustion engine of claim 1 , further comprising at least two cylinders and wherein the cylinder head of each cylinder assembly is formed of a single piece of material.
12 . The internal combustion engine of claim 1 , further comprising a valve train comprising:
a cam shaft arranged in an engine block; and
a series of pushrods and rockers arranged to open and close the inlet and outlet valves.
13 . The internal combustion engine of claim 1 , wherein the fuel injector is located below the inlet runner.
14 . The internal combustion engine of claim 1 , wherein the injection port is arranged intermediate the two inlet ports.