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1. (WO1992010652) COMBUSTION ENGINE COMBINATION
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Claims
1. A combustion engine combination having at minimum two power units (1, 2) , each of which is made up of its independe crankshaft and one or more actuating cylinders driving it, an of mechanisms for combining these power units to rotate the power output shaft or shafts, and of which power units the first (1) has cylinders (SI) of a greater diameter (Dl) and a smaller number (nl) of cylinders than the second power unit (2) , which thus has cylinders (S2) of a smaller diameter ( 2) and a larger number (n2) of cylinders than the first power un (1) , characterized in that the diameter (Dl) of the cylinders in the first power unit (1) is at minimum one and a half fold, and preferably at least double, the diameter (D2) of the cyli ders of the second power unit (2) , and in addition, the numbe of cylinders (n2 and respectively nl) and stroke lengths have been dimensioned to provide these power units with substantia ly different power and torque curves in order to use these power units separately or together within different rotation speed ranges.

2. A combustion engine combination according to Claim 1, characterized in that the crankshafts of the power units (1, 2 are interconnected via lockingly engageable couplings (4) or directly, in which case the crankshafts of the power units wil rotate at the same rotational speed locked to each other durin use.

3. A combustion engine combination according to Claim 1, characterized in that the crankshafts of the power units (1, 2 are interconnected by a clutch ( ) , gear system or an equivalent, such as a liquid clutch, variator, torque converter, differential gear, or the like, which makes possible between them a rotational speed difference of variable magnitude.

4. A combustion engine combination according to Claim 1, characterized in that the crankshaft of each power unit (1, 2) is connected by a lockingly engageable coupling (4; 14a, 14b) to one power output shaft (10) or to a gear system (13) or the like driving it, in which case different power units can be connected by means of these to drive this power output shaft (10), either separately or in different combinations, the connected power units rotating either at the same speed of rotation of the crankshafts or at pre-proportioned different speeds of rotation of the crankshafts.

5. A combustion engine combination according to Claim 1, characterized in that the crankshaft of each power unit ( 1 , 2 ) is connected by means of a clutch (14a, 14b), gear system or the like making possible a rotational speed difference of variable magnitude between the units to one power output shaft (10) or to a gear system (13) or the like driving it, in which case different power units can be connected by means of these to drive this power output shaft (10), either separately or in different combinations, the connected power units rotating either at the same speed of rotation of the crankshafts or at pre-proportioned different speeds of rotation of the
crankshafts.

6. A combustion engine combination according to Claim 4 or 5, characterized in that the said same or pre-proportioned different speeds of rotation of the crankshafts in the different power units (1, 2) are achieved in this gear system (13) by the use of the transmission ratio of shafts (11, 12) connectable to the power units in the gear system.

7. A combustion engine combination according to Claim 1, 2 or 3 , characterized in that each power unit is connected to its separate power output shaft set (6, 7; 11, 12) for the use of power and torque.

8. A combustion engine combination according to Claim 1, characterized in that the numbers of cylinders (nl and respec- tively n2) of at least the first and second power units, their cylinder diameters (Dl and respectively D2) and their stroke lengths are so dimensioned that the total stroke volumes of these two power units (1, 2) are at least approximately equal.

9. A combustion engine combination according to Claim 1 or 8, characterized in that the number of cylinders, cylinder diameter or stroke length in at least one power unit is so selected that the stroke volume of this power unit substantial ly deviates from the stroke volumes of the second power unit o the other power units.

10. A combustion engine combination according to Claim 1, characterized in that the speeds of rotation of the crankshaft of the different power units (1, 2) are maintained at the same speed of rotation synchronized relative to each other or at synchronized different speeds of rotation deviating in a prede termined manner, by measuring the speed of rotation by means o sensors located on the crankshafts and by regulating the infee of fuel.

11. A combustion engine combination according to Claim 7 which serves as a source of power moving a vehicle on wheels, characterized in that the said first power unit (1) drives wit its power output shaft set (7) the rear wheels (9) or wheel of the vehicle and the said second power unit (2) respectively with its output shaft set (6) the front wheels (8) or wheel of the vehicle, and that the first power unit (1) and the second power unit (2) are interconnected by an intermediate shaft (5) independent of these output shaft sets (6, 7) either directly or via a lockingly engageable coupling or alternatively a clutch or an equivalent permitting a rotational speed difference of a variable magnitude.

12. A combustion engine combination according to any of the above claims, characterized in that power units (1, 2) are, depending on the shaft rotational speed (r/min) required at each given time, connected to the drive means (6, 7; 11, 12) i such a manner that at low speeds of rotation only the first power unit is connected, at medium speeds of rotation only the second power unit is connected, and at high speeds of rotation both power units are connected.