Internal-combustion engines – Rotating cylinder – Radial
Patent
1991-12-10
1994-12-27
Koczo, Jr., Michael
Internal-combustion engines
Rotating cylinder
Radial
91493, 60 396, 123 44D, F02B 5706
Patent
active
053755642
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a reciprocating engine, particularly a reciprocating internal combustion engine.
Known from German Offenlegungsschrift No. 25 02 709 is a reciprocating internal combustion engine having a cylinder rotor which is mounted to rotate about an axis of rotation housing which forms the engine base. The cylinder rotor contains four cylinders which, angularly offset by 90.degree. in respect of one another, are disposed in pairs about the axis of rotation of the cylinder rotor, coaxially with a cylinder axis extending at right-angles to the axis of rotation. Disposed for displacement in the cylinders are pistons which are in turn connected rigidly to one another in pairs by piston rods. Mounted equiaxially with the cylinder rotor in the housing is a crank shaft, the crank arm of which carries rotatable cam discs which are in turn rotatably mounted in bearing apertures in the piston rods. The eccentricity of the cam discs is equal to the eccentricity of the crank arm of the crank shaft. Upon rotation of the cylinder rotor and of the crank shaft, the pairs of pistons move on a rectilinear path through the axis of rotation of the cylinder rotor. Internal combustion engines of this type have comparatively low piston speeds at low cylinder rotor speed and offer a high output for comparatively small overall volume. Furthermore, they offer only minimal imbalance.
In the case of the internal combustion engine described hereinabove, the cylinder rotor is required to rotate at a speed which is equal to half the rotary speed of the crank shaft. For this purpose, the cylinder rotor is rotationally rigidly coupled to the crank shaft via a planetary gearing. The planetary gearing has, seated on the crank shaft, a sun wheel of comparatively small diameter which has to accommodate the entire moment of reaction of the cylinder rotor and which must accordingly be of large dimensions. It has been found that with adequate dimensioning, the planet gearing can occupy a substantial part of the overall volume of the internal combustion engine.
In the case of an internal combustion engine of the above described known type, the piston travel corresponds to four times the eccentricity of the cam discs or of the crank arm of the crank shaft. Since the piston travel cannot be of any desired length for reasons which relate to design and combustion technology, there are imposed on the eccentricity of the cam discs or the crank arm structural limits which cannot be exceeded. On the other hand, the double mounting of the cam disc on the crank arm on the one hand and on the piston rod on the other does require a certain overall space which first and foremost can only be provided by weakening the crank pin diameter. Weakening the crank pin however does limit the maximum output which can be generated by the internal combustion engine.
Known from DE-OS 25 36 739 is a similar internal combustion engine with a cylinder rotor and with, angularly offset by 90.degree. about the axis of rotation of the cylinder rotor, two pairs of cylinders and which differs from the internal combustion engine according to DE-OS 25 02 709 mainly in that the crank shaft is not equiaxially but axially parallel and eccentrically disposed in relation to the axis of rotation of the cylinder rotor. Also with this internal combustion engine, the cylinder rotor is positively driven by the crank shaft through a gear mechanism which means that the aforementioned structural disadvantages apply.
It is known from MTZ 30 (1969) 4, pages 142 to 144 to construct an internal combustion engine of the afore-described type not only with two pairs of cylinders but as a 6-cylinder engine. But also with this internal combustion engine, the cylinder rotor is coupled to the crank shaft through a planetary gearing and the piston rods of the individual pistons are guided by cam discs on the crank shaft which are rotatably mounted both on the crank arm of the crank shaft and also in the piston rod. Here, again, the aforesaid disadvantages apply.
An internal combustion engine ha
REFERENCES:
patent: 1220455 (1917-03-01), Rasmussen
patent: 1681454 (1928-08-01), Aber
patent: 2683422 (1954-07-01), Richards
patent: 3665811 (1972-05-01), Van Avermaete
patent: 3799035 (1974-03-01), Lamm
patent: 3921602 (1975-11-01), Froumajou
patent: 4040398 (1977-08-01), Billings et al.
Fink, MTZ 30 (1969) pp. 142-144.
Klein, "Der Konstrukteur" May. 1986 pp. 6-16.
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