Internal-combustion engines – Adjustable combustion chamber – Piston in head adjusted
Patent
1995-11-20
1997-03-18
Okonsky, David A.
Internal-combustion engines
Adjustable combustion chamber
Piston in head adjusted
123 78C, 123195R, F02B 2300
Patent
active
056113013
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a combustion engine including a cylinder section disposed in a crankcase section, wherein the crank case section has a lateral wall spaced at an air gap from the cylinder section and particularly relates to a selection of materials for the engine to enhance thermal conductivity while damping vibration and noise.
STATE OF THE ART
In engine technology it is known, of prior art, for different parts of combustion engines to be made of different materials. One well-proven choice of material has been cast iron for the cylinder section, crankshaft section and cylinder head of combustion engines. The increasing importance attached to weight has motivated increasing use of aluminium despite the latter being a more expensive construction material. Aluminium has been used in engines for the cylinder head only, for the cylinder head and cylinder section and for the whole engine. Aluminium has the advantage of its thermal conductivity being significantly better than that of cast iron, whereas east iron provides significantly greater internal damping of vibration and noise.
OBJECT OF THE INVENTION
The object of this invention is to achieve an engine in which the greatest possible advantage is taken of the damping capacity of east iron while at the same time achieving high thermal conductivity in the immediate vicinity of the combustion chamber. A further object is to achieve, by correct constractional design of the engine unit, a filtering out of transmitted vibration in a transition zone between different materials with different vibration-conducting characteristics. Another object is to provide around a combustion engine mainly surrounded by aluminium a secondary screen of east iron, with an intermediate air space, for increased damping of noise emitted by the combustion engine. Another object is, in connection with the manufacture of a combustion engine with variable compression, to adapt the choice of materials for different parts of the engine so as to achieve the most advantageous material composition from the vibration point of view.
According to the invention, this object is achieved by engine design wherein the cylinder section includes the combustion chamber and the cylinder head is disposed over the combustion chamber. The cylinder section is comprised of a light metal alloy, preferably aluminum alloy, while the crankcase section is made of a material of a density which exceeds that of the cylinder section, by a factor of at least 2.6, e.g. cast iron. The cylinder section has a lower portion away from the cylinder head at which the cylinder section is secured to the crankcase section in a manner permitting relative tilting between them e.g. by a tilt shaft connection between them.
Further features and advantages characterising the invention are indicated in the following description of an advantageous embodiment.
LIST OF FIGURES
The description is given with reference to the attached drawings, in which
FIG. 1 shows a perspective view of the engine,
FIG. 2 shows a vertical cross-sectional view of the engine in a position for maximum compression,
FIG. 3 shows a perspective and detailed view of an arrangement for varying the compression of the engine.
DESCRIPTION OF THE EMBODIMENT
The embodiment is described with reference to a multiple cylinder combustion engine of the Otto type, intended for use in a vehicle such as a passenger car. The attached FIG. 1 shows in perspective the basic construction of the engine 10, in which a number of components have been omitted to improve the clarify of the figure. FIG. 2 shows the engine 10 in cross-section, with the cylinder head fitted, but does not show the complete engine.
The engine 10 incorporates a cylinder section 11, in this case with four cylinders 12 arranged in line and each cylinder including a combustion chamber. The engine 10 also includes a crankcase section 13 housing the crankshaft 14 of the engine 10 and the crankshaft bearings. Each cylinder 12 houses a piston 15 which is connected by a connecting rod 16 to the cranks
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patent: 5404847 (1995-04-01), Han
Bergsten Lars
Gillbrand Per
Okonsky David A.
Saab Automobile Aktiebolag
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