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US 8,499,726 B2Granted
Internal combustion engines
AssigneeCox Powertrain Limited
InventorDavid Cox
Life of this patent
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Abstract
The invention provides a 2-stroke internal combustion engine comprising two opposed cylinders, each cylinder housing two opposed pistons and having at least one exhaust port and at least one intake port, and a crankshaft having asymmetrically arranged journals and scotch-yoke mechanisms for driving the journals from the pistons. The pistons in each cylinder operate to open its exhaust port or ports before its intake port or ports and to close its exhaust port or ports before its intake port or ports.
Claims20
A 2-stroke internal combustion engine comprising:
- a crankshaft having a plurality of journals;
- two opposed cylinders having their inner ends adjacent to the crankshaft, each cylinder having inner and outer pistons reciprocatably disposed therein and forming a combustion chamber therebetween;
- first and second scotch-yoke mechanisms, rigidly attached to the inner pistons, which, acting in unison, drivingly couple the inner pistons to their corresponding journals on the crankshaft;
- and
- a third scotch-yoke mechanism, rigidly attached to the outer pistons, which drivingly couples the outer pistons to their corresponding journal on the crankshaft;
- wherein each cylinder comprises a sleeve-valve with one or more exhaust ports at one end and one or more intake ports at the other;
- wherein a rigid extension to the end of the sleeve-valve adjacent to the crankshaft contains a hole drivingly coupled to a first eccentric spherical journal on one end of the crankshaft, the extension being split at the hole's diameter through a plane normal to the cylinder's axis forming a removable cap fastened to the extension in order to enable assembly.
4 more elements
A 2-stroke internal combustion engine comprising:
- a crankshaft having a plurality of journals;
- two opposed cylinders having their inner ends adjacent to the crankshaft, each cylinder having inner and outer pistons reciprocatably disposed therein and forming a combustion chamber therebetween;
- first and second scotch-yoke mechanisms, rigidly attached to the inner pistons, which, acting in unison, drivingly couple the inner pistons to their corresponding journals on the crankshaft;
- and
- a third scotch-yoke mechanism, rigidly attached to the outer pistons, which drivingly couples the outer pistons to their corresponding journal on the crankshaft;
- wherein each cylinder comprises a sleeve-valve with one or more exhaust ports at one end and one or more intake ports at the other;
- wherein the mass of both sleeve-valves multiplied by the throw of one of their associated journals substantially equals 2 sin(α/2) multiplied by the mass of a system comprising the outer pistons and third scotch yoke or a system comprising the inner pistons and first and second scotch yokes multiplied by its associated crankshaft journal throw, where α is 180° minus the smaller angle subtended by the journals associated with the sleeve-valves.
4 more elements
A 2-stroke internal combustion engine comprising:
- a crankshaft having a plurality of journals;
- two opposed cylinders having their inner ends adjacent to the crankshaft, each cylinder having inner and outer pistons reciprocatably disposed therein and forming a combustion chamber therebetween;
- first and second scotch-yoke mechanisms, rigidly attached to the inner pistons, which, acting in unison, drivingly couple the inner pistons to their corresponding journals on the crankshaft;
- and
- a third scotch-yoke mechanism, rigidly attached to the outer pistons, which drivingly couples the outer pistons to their corresponding journal on the crankshaft;
- wherein fuel injection means are provided for each cylinder, remote from the crankshaft, reciprocatably received within a tubular member attaching the outer piston to its associated scotch-yoke where multiple radial high pressure fuel jets are released during the injection phase around the time when the inner and outer pistons of the associated cylinder are at their position of closest approach, these jets accessing the associated combustion chamber via small radial holes made through the tubular member which register and envelop the jets during the injection period.
3 more elements
A two-stroke internal combustion engine comprising:
- a crankshaft;
- and
- two opposed cylinders having their inner ends nearest to the crankshaft, each cylinder having inner and outer pistons disposed therein and forming a combustion chamber therebetween,
- wherein each outer piston is drivingly coupled to the crankshaft by a respective tubular member extending generally axially through the combustion chamber, and wherein fuel injection means housed within the tubular members are arranged to inject fuel radially outwardly into the combustion chamber.
1 more element
Dependencies are inferred from the claim text.