Machine element or mechanism – Mechanical movements – Rotary to or from reciprocating or oscillating
Patent
1985-10-02
1987-12-15
Arola, Dave W.
Machine element or mechanism
Mechanical movements
Rotary to or from reciprocating or oscillating
74603, 123192B, F16F 1526
Patent
active
047124369
ABSTRACT:
A rotary crankshaft has multiple cranks. Each crank drives a reciprocating member in a cylinder or guideway via a con rod. Main counterweights are attached to the crankshaft and rotate therewith. Two contraweights rotate in the opposite direction from the crankshaft and at the same RPM as the crankshaft. The two contraweights are generally rotatably mounted on the crankshaft, coaxial therewith, and near each end of the crankshaft. The two contraweights are driven from the crankshaft by toothed gearing. The two contraweights plus the main counterweights combine forces so as to counterbalance the primary reciprocating inertia forces of a plurality of said reciprocating members.
By proper adjustment of the size and angular location of both the main counterweights and the two contraweights, it is possible to obtain near perfect primary balance under any or all of the following conditions:
REFERENCES:
patent: 1163832 (1915-12-01), Lanchester
patent: 1205895 (1916-11-01), Hoyt
patent: 1898459 (1933-02-01), Newcomb
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patent: 3109417 (1963-11-01), Bekkala et al.
patent: 3402707 (1968-09-01), Heron
patent: 3415237 (1968-12-01), Harkman
patent: 3763716 (1973-10-01), Blomberg
patent: 4290395 (1981-09-01), Sakano et al.
patent: 4545341 (1985-10-01), Corey et al.
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