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US 4,819,593 AGranted
Pivoting balancer system
AssigneeBriggs & Stratton Corporation
InventorsPatrick J. Bruener, Joseph R. Harkness, Norbert M. Vogl, Glen C. Eifert
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AssigneeBriggs & Stratton Corporation
InventorsPatrick J. Bruener, Joseph R. Harkness, Norbert M. Vogl, Glen C. Eifert
Estimating the term…
A balance system for an internal combustion engine or the like includes a counterbalance weight pivotally mounted to the crankcase and driven in a reciprocating manner by a link assembly connecting the weight to an eccentric on the crankshaft. The pivoting weight not only counterbalances the piston acceleration and deceleration forces but also cancels the torsional forces created by the weight as it pivotally moves through an arc in response to piston movement. This is accomplished by locating the center of gravity of the balance weight between the piston bore centerline and the stationary pivot of the balance weight itself. This location for the center of gravity causes a torque to be generated by a force couple created by the piston inertial force vector, the balance weight interial force vector, and the distance between them. This torque counteracts the torque generated by angular acceleration of the balance weight itself, to thereby substantially eliminate all torsional vibrations.
In an apparatus of the type having a cylinder defining a cylinder axis and a crankcase, a crankshaft rotatably mounted in the crankcase, said crankshaft defining a crankshaft axis substantially normal to said cylinder axis and having a crankpin flanked by a pair of crankarms that connect the crankpin to the crankshaft in eccentrically offset relation to the crankshaft axis, and a piston axially reciprocable in the cylinder and connected with the crankpin, counterbalancing means comprising:
In an apparatus of the type having a cylinder defining a cylinder axis and a crankcase, a crankshaft rotatably mounted in the crankcase, said crankshaft defining a crankshaft axis substantially normal to said cylinder axis and having a crankpin flanked by a pair of crankarms that connect the crankpin to the crankshaft in eccentrically offset relation to the crankshaft axis, and a piston axially reciprocable in the cylinder and connected with the crankpin, counterbalancing means comprising:
Dependencies are inferred from the claim text.