Abstract:
An internal combustion piston engine having a plurality of intake valves and a plurality of exhaust valves per cylinder employs apparatus for disabling the operation of at least one exhaust valve upon decrease in speed of the engine below a predetermined level.
Abstract:
A combustion chamber configuration for an engine having three intake valves and two exhaust valves per cylinder. The combustion chamber configuration permits the use of stroke-to-bore ratios of 0.8 to 1 or less and compression ratios of 9 to 1 or greater while affording good flame travel in the combustion chamber. The piston is formed with a generally flat head that has semi-circular recesses for valve clearance.
Abstract:
A valve actuating mechanism for an internal combustion engine that permits the use of a plurality of valves per combustion chamber. There are a greater number of intake valves than exhaust valves and the intake valves are actuated by means of a single rocker arm associated with a first cam shaft. The exhaust valves are individually and directly operated by a second camshaft.
Abstract:
A valve arrangement for an internal combustion engine that permits the use of a plurality of closely spaced valves. The valves are all directly actuated by means of thimble tappets that have non-cylindrical cross-sections so as to permit the tappet bodies to be positioned close to each other and yet afford a large area for their sliding support. The tappet bodies are also supported within the cylinder head assembly by means including a separate insert.
Abstract:
An internal combustion piston engine having a plurality of intake valves and a plurality of exhaust valves per cylinder employs apparatus for disabling the operation of at least one exhaust valve upon decrease in speed of the engine below a predetermined level.
Abstract:
Three intake and two exhaust valves are arranged on a single circumferential line around the center of the combustion chamber with the longitudinal axes of the valves crossing at a single point on the longitudinal axis of the cylinder. An ignition plug is provided in the space between the two exhaust valves and is angled so that its forward end is directed towards the center of the combustion chamber. A single common cam shaft is provided horizontally at an intermediate position of the cylinder head between the intake valves and the exhaust valves.
Abstract:
A reciprocating internal combustion engine has a head structure which includes a cylinder head and a separate inserted plate clamped between the cylinder head itself and the engine block. The combustion chamber of the or each cylinder is formed in the cylinder head in a position centered on the axis of the respective cylinder and the inserted plate has an aperture centered on the axis of the cylinder which puts the cylinder itself into communication with its combustion chamber. In correspondence with the or each cylinder, the inserted plate is formed with at least one first pair of opposing valve seats facing into the communication aperture, and corresponding inlet and/or exhaust ducts. These seats have associated mushroom valves with stems which extend through corresponding holes in the inserted plate and are slidable in the cylinder head. The cylinder head, in correspondence with the or each cylinder, is formed with at least one second pair of opposing valve seats facing into the combustion chamber, and corresponding inlet and/or exhaust ducts. These seats have associated mushroom valves with stems which are slidable in the cylinder head. The axes of the two pairs of valves are substantially coplanar. The crown of the or each piston has a projection of a form such as substantially to fill the respective communication aperture when the piston is at top dead-center.
Abstract:
A system for an internal combustion engine can include a separation device and an engine component including first and second valves. The separation device can separate intake air into a volume of nitrogen-rich air and a volume of oxygen-rich air. A first valve element can be movable relative to a first valve body and can have an annular shape disposed about a central axis of the combustion chamber. The first valve body can be fluidly coupled to the separation device and direct the oxygen-rich air into a central area of the combustion chamber. A second valve element can be movable relative to a second valve body and can have an annular shape disposed about the central axis, radially outward of the first valve. The second valve body can be fluidly coupled to the separation device and can direct the nitrogen-rich air to a peripheral area of the combustion chamber.
Abstract:
One exemplary embodiment of the present disclosure relates to an engine intake port structure. According to the engine intake port structure of the exemplary embodiment of the present disclosure, a chamfer is formed to be offset to either side from an end corner of an intake port. Accordingly, the inflow of a fuel gas is concentrated on a side in which an opening width of the chamfer is wide at the beginning of an opening stage when the intake port is opened/closed by a valve unit, and after the intake port is opened, the opening width is formed to be similar at four sides of the valve unit such that swirls formed in the fuel gas is weakened. That is, complete combustion of the fuel can be anticipated since the length of time during which the fuel gas remains in a combustion chamber is extended.