Balancer structure for three-cylinder engines
This patent describes a balancer structure for a three-cylinder in-line engine having aligned three cylinders, a crankshaft having crank arms disposed at angles of 120/sup 0/ with respect to each other and operatively connected to the cylinders, respectively. This structure consists of: 1.) a single countershaft adjacent and parallel to and rotated at the same speed as the crankshaft but in the opposite direction; 2.) a counterweight is securely mounted on the crankshaft only at positions corresponding to the first and third cylinders for balancing a part of inertia force of reciprocating mases and the entire inertia force of rotating masses; 3.) at least one second counterweight securely mounted on the crankshaft substantially opposite to the crank arm corresponding to the second cylinder for balancing another part of the inertia force of the reciprocating masses; 4.) at least two balancers securely mounted on the countershaft at both ends for the balancing of the remainder of the inertia force of the reciprocating masses and a couple of inertia of the crankshaft about an axis perpendicular to the crankshaft.
- Assignee:
- Fuji Jukogyo Kabushiki, Kaisha, Tokyo
- Patent Number(s):
- US 4569316
- OSTI ID:
- 6045559
- Country of Publication:
- United States
- Language:
- English
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