Internal-combustion engines – Rotary – With transfer means intermediate single compression volume...
Patent
1992-06-05
1994-07-19
Koczo, Michael
Internal-combustion engines
Rotary
With transfer means intermediate single compression volume...
F02B 5300
Patent
active
053299000
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a rotary internal combustion engine in which compression and expansion take place in different chambers.
GB-A-1505853 (published Mar. 30, 1978) discloses a rotary engine having a pair of intermeshing rotors having truncated cycloidal lobes driven by intermeshing gears to compress the fuel/air mixture in combustion zones formed by the intermeshing rotors. The intermeshing rotors are mounted on shafts geared together in a 1:1 speed ratio. The compression/expansion achieved by the action of the two rotors does not provide a completely swept volume in which the volume of the charge remaining entrapped between the rotors is reduced to a minimum clearance volume. Compression, combustion and expansion take place in the same cylinder.
DE-A-3626084 (published Mar. 19, 1987) discloses a rotary engine (FIG. 5) in which compression, combustion and expansion take place in different chambers. The compression and expansion sections are of essentially the same construction but differ in the location of the inlet ports and outlet ports. Each consists of a pair of rotors having respective opposed sealing vanes wiping the surface of the cylinder. The rotors have cut-out portions adjacent the vanes to receive the vane of the other rotor in the vicinity of the point of contact of the rotors. In one rotor of each pair, the cut outs permit gas flow through an inlet (expansion section) or outlet (compression section) which is otherwise closed by the rotor. In one illustrated embodiment (FIG. 3), the rotors are toothed but the intermeshed teeth do not serve to define the compression chamber.
GB-A-1098854 (published Jan. 10, 1968), GB-A-1574549 (published Sep. 10, 1980), U.S. Pat. No. 3,902,465 (Sep. 2, 1980) and U.S. Pat. No. 4,476,826 (Oct. 16, 1984) all describe rotary engines in which combustion takes place in a separate chamber located between compression and expansion chambers.
U.S. Pat. No. 3,472,445 (published Oct. 14, 1969) and GB-A-1304394 (Jan. 24, 1973) both disclose air compressors having intermeshing counter-rotating lobed rotors contained within a housing. The lobes of the rotors sweep the housing wall to provide the main compression effect but a transient chamber of reducing volume is formed between the rotor lobes over a part of their rotational path to exhaust the compressed charge. Usually, the rotors have equal numbers of lobes and rotate at the same speed. However, U.S. Pat. No. 3,472,445 illustrates (Figure XXI) an arrangement in which a smaller rotor has a single lobe and a larger rotor has two lobes and the rotors rotate at a 2:1 rotational speed ratio. GB-A-1304394 refers to the possibility of having different numbers of lobes and/or different diameters and, in the case of rotors with different number lobes, to the use of appropriate transmission ratios to drive the rotors at appropriate different speeds.
The requirements for the compressor section of an internal combustion engine are very different from those of an air compressor. In particular, it is desirable that there should be substantially no pre-compression in the compressor section and that delivery/receipt of the charge should commence substantially simultaneously with compression. Surprisingly, it has been found that use of intermeshing counter-rotating lobed rotors of the kind disclosed in U.S. Pat. No. 3,472,445 or GB-A-1304394 in internal combustion engines substantially improves the efficiency of engines of the kind to which the present invention relates.
According to the present invention, there is provided an internal combustion engine comprising separate rotary compression and expansion sections and a combustion chamber having valved inlet and outlet ports communicating with said compression and expansion sections respectively, characterised in that each of said compression and expansion sections is a rotary device comprising: a first rotor rotatable about a first axis and having at its periphery a recess bounded by a curved surface; and a second rotor counter-rotatable to said first rotor about a second axis, par
REFERENCES:
patent: 3203406 (1965-08-01), Dettwiler
patent: 4321897 (1982-03-01), Pelekis
patent: 4848295 (1989-07-01), Loran et al.
patent: 4971002 (1990-11-01), Le
Koczo Michael
Surgevest Limited
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