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An internal combustion engine provided with a mass balance unit of the second order. The mass balance unit includes two balancing shafts with each of the balancing shafts being provided with balancing weights. The balancing shafts are arranged on respective sides of the crankshaft of the engine and

An internal combustion engine provided with a mass balance unit of the second order. The mass balance unit includes two balancing shafts with each of the balancing shafts being provided with balancing weights. The balancing shafts are arranged on respective sides of the crankshaft of the engine and extend in parallel thereto. The balancing shafts are driven with a chain by a sprocket wheel seated on the crankshaft with one of the shafts being directly driven for rotation in the direction of rotation of the crankshaft and the other rotating, through the interposition of a pair of gear wheels, in a direction in opposition to the direction of rotation of the crankshaft. The directly driven balancing shaft with sprocket wheel is mounted on an inside of the lid covering an opening of the crankcase of the engine. The other balancing shaft is supported on a bearing cover for the crankshaft and the driving is effected from a sprocket wheel attached to a crank web of the crankshaft.

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1. An internal combustion engine provided with a mass balance means of the second order, the mass balance means includes two balancing shafts respectively arranged on each side of and parallel to a crankshaft of the engine, balancing weight means on each of the balancing shafts, means for directly d

1. An internal combustion engine provided with a mass balance means of the second order, the mass balance means includes two balancing shafts respectively arranged on each side of and parallel to a crankshaft of the engine, balancing weight means on each of the balancing shafts, means for directly driving one of the balancing shafts in a direction of rotation of the crankshaft and for indirectly driving the other of the balancing shafts in a direction of rotation opposite the direction of rotation of the crankshaft, characterized in that a lid means is provided for covering an opening of a crankcase of the engine, a bearing cover means is provided for covering a main bearing pin of the crankshaft, the directly driven balancing shaft is mounted on an inside of the lid means, the indirectly driven balancing shaft is supported on the bearing cover means, the driving means includes a sprocket wheel attached to a crank web of the crankshaft, a chain means cooperable with the sprocket wheel attached to the crank web of the crankshaft, a drive shaft means having a drive sprocket wheel on a first gear mounted thereon, a further gear cooperable with the first gear is provided on the indirectly driven balancing shaft, and in that the drive shaft means is supported in the bearing cover means and an adjacent bearing cover for the crankshaft. 2. An internal combustion engine according to claim 1, characterized in that the drive means further includes an additional sprocket wheel mounted on the directly driven balancing shaft, a sliding rail means is provided for guiding a movement of the chain means between the drive sprocket wheel and the additional sprocket wheel, and in that at least a portion of the sliding rail at least in an area of the drive sprocket wheel is formed as a chain box means for partially encompassing the drive sprocket wheel. 3. An internal combustion engine according to claim 1, characterized in that a chain tightener means is cooperable with a face of the chain at a position between the sprocket wheel attached to the crank web of the crankshaft and the drive sprocket wheel, and in that the chain tightener means is attached to an inside of a further lid means covering an opening in the crankcase. 4. An internal combustion engine according to one of claims 1 or 3, characterized in that the internal combustion engine includes a lubricating oil circulatory system, spray nozzle means are connected to the lubricating oil circulatory system and are directed to impact points for the chain means. 5. An internal combustion engine according to one of claims 1 or 3, wherein the internal combustion engine is a four cylinder engine, and wherein the crankshaft is provided with a counterweight at least in front of a first connecting rod bearing pin and a last connecting rod bearing pin, characterized in that the sprocket wheel attached to the crank web of the crankshaft is arranged between the first and second cylinders and in that at least the counterweight in front of the first connecting rod bearing pin is detachable from the crankshaft so as to enable the sprocket wheel to be attached to the crank web of the crankshaft. 6. An internal combustion engine according to claim 3, characterized in that the drive means further includes an additional sprocket wheel mounted on the directly driven balancing shaft, a sliding rail means is provided for guiding a movement of the chain means between the drive sprocket wheel and the additional sprocket wheel, and in that at least a portion of the sliding rail at least in an area of the drive sprocket wheel is formed as a chain box means for partially encompassing the drive sprocket wheel. 7. An internal combustion engine according to claim 6, characterized in that the engine further includes a lubricating oil circulatory system, a plurality of spray nozzle means are connected to the lubricating oil circulatory system and are respectively directed to impact points for the chain means, meshing points of the gear and further gear, and the chain tightener means. 8. An internal combustion engine according to claim 6, wherein the internal combustion engine is a four cylinder engine, and wherein the crankshaft is provided with a counterweight at least in front of a first connecting rod bearing pin and a last connecting rod bearing pin, characterized in that the sprocket wheel attached to the crank web of the crankshaft is arranged between the first and second cylinders, and in that at least the counterweight in front of the first connecting rod bearing pin is detachable from the crankshaft so as to enable the sprocket wheel to be attached to the crank web of the crankshaft. 9. An internal combustion engine according to one of claims 1, 3, or 6, wherein the internal combustion engine is a four cylinder engine, and wherein the crankshaft is provided with a counterweight at least in front of a first connecting rod bearing pin and a last connecting rod bearing pin, characterized in that the sprocket wheel attached to the crank web of the crankshaft is arranged between the third and fourth cylinders, and in that at least the counterweight behind the last connecting rod bearing pin is detachable from the crankshaft so as to enable the sprocket wheel to be attached to the crank web of the crankshaft.