Balancer device for internal combustion engines
This patent describes an internal combustion engine having at least two cylinders arranged in the shape of a ''V'' at an included angle other than 90/sup 0/, pistons in the cylinders, a crankshaft supported for rotation, and connecting rods connecting each of the pistons with the crankshaft. The connecting rods are offset in the axial direction of the crankshaft. The improvement described here consists of 1.) a balancer device comprising only one shaft member supported for rotation about an axis parallel to the axis of rotation of the crankshaft and a means for driving the shaft member at the same speed as the crankshaft but in the opposite direction; 2.) a first weight on the shaft member for balancing at least a portion of the force of first order which is generated by the reciprocal movements of the pistons; and 3.) further weights formed on the shaft member for eliminating the force couple generated from the axial offset of the connecting rods.
- Assignee:
- Yamaha Hatsudoki Kabushiki Kaisha, Iwata
- Patent Number(s):
- US 4617885
- OSTI ID:
- 5074488
- Resource Relation:
- Patent File Date: Filed date 27 May 1982
- Country of Publication:
- United States
- Language:
- English
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