Internal-combustion engines – Combustion chamber means combined with air-fuel mixture... – Air or combustible mixture entering the combustion chamber...
Patent
1983-02-25
1985-12-17
Cline, William R.
Internal-combustion engines
Combustion chamber means combined with air-fuel mixture...
Air or combustible mixture entering the combustion chamber...
123 9027, F02M 1306
Patent
active
045586764
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a two-cylinder, four-stroke-cycle, double-piston engine of a construction for example, of the air-flow-cooled type for motorcycles, having a camshaft for each cylinder, with said camshaft being disposed on top and horizontally disposed, parallel to the crankshaft and 1:2-geared-down with respect to said crank shaft, with the camshaft being driven by an intermediate shaft geard down approximately 1:2 with respect to the speed of the crank shaft and arranged parallel to the crank shaft, by means of, in each case, one approximately 1:1 transmitted chain or belt drive, in which case, the chain or belt drives are disposed in driving direction behind the cylinders.
A known double-piston engine of this construction according to DE-OS No. 27 03 520 has a relatively fissured outer shape resulting especially from the arrangement of the valves and their gear. The reason is that the intermediate shaft for the drive of the two upper camshafts is arranged above the crankshaft, and the chain or belt drives extend, with separate coverings which are arranged at a distance from the cylinders and the cylinder heads, to control housings which, in each case, project from the cylinder head. The arrangement of, in each case, parallel inlet and outlet valves also contributes to the unsymmetrical and fissured construction of this double-piston engine. In addition, the housing components which project considerably beyond the basic contour of the cylinders and cylinder heads also result in a high cost of construction and correspondingly heavy weight.
It is the objective of the invention to avoid the above-mentioned disadvantages and to create a double-piston engine on the basis of the known construction which has a compact overall structure with low cost of construction and low weight, favorable conditions for good ground clearance when installed into motorcycles, an efficient and speed-fixed control with a V-valve arrangement, a largely smooth and appealing outer shape that is easy to clean as well as finally a good cooling-air flow at the cylinders and cylinder heads when it is air-flow-cooled.
In order to achieve this manifold objective, the invention provides an arrangement of the intermediate shaft below the crank shaft the drive of the intermediate shaft being at the front end of the crank shaft with a pump wheel of a lubricating-oil pump on the intermediate shaft. The chain or belt drives are in tunnels of the cylinders and cylinder heads, the valves with the drive by means of rocking levers in vertical V-position with the camshaft in the V-space, and the intake and exhaust-gas lines to and from the cylinder heads extending essentially vertically upward and downward. By means of these characteristics, the objective of the invention is achieved in a surprisingly favorable manner. Because of these characteristics, the valve drive including the oil-pump drive, requires very little space, without housing parts or coverings projecting beyond the basic contour of the engine components. The valve, camshaft and gas-changing duct arrangements also result in a very compact overall structure of the double-piston engine, with the intake and exhaust-gas systems resting closely against the outside contours on the upper side and the bottom side of the cylinders and cylinder heads.
The V-positions of the valves are, in each case, in their vertical plane, and are swivelled upward at an angle with respect to a horizontal-symmetrical arrangement so that the outlet valves are sloped downward by an angle of about 0.degree. to 20.degree., and the inlet valves are sloped upward at an angle of about 30.degree. to 50.degree.--always in the direction of their shaft ends. The above arrangements are further improved so that the intake systems on the upper side of the cylinders and cylinder heads of both sides come still closer and, on the whole, require even less space, while the exhaust gas ducts on the bottom side of the cylinders and cylinder heads are provided with more space for leading the exhaust gas pipes toward the center
REFERENCES:
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patent: 3418993 (1968-12-01), Scheiterlein et al.
patent: 4156409 (1979-05-01), Nakano
patent: 4317438 (1982-03-01), Yagi et al.
patent: 4320671 (1982-03-01), Curasi
patent: 4395980 (1983-08-01), Tominaga et al.
Bayerische Motoren Werke AG
Cline William R.
Neils Peggy A.
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