Internal-combustion engines – Vibration compensating device
Patent
1987-12-17
1989-07-11
Argenbright, Tony M.
Internal-combustion engines
Vibration compensating device
74573R, F16F 1528, F16F 1530
Patent
active
048461237
ABSTRACT:
A single cylinder internal combustion engine in a portable power tool is provided with a flywheel counterweight member which functions to substantially reduce engine vibration attributable to linear inertial and reactive forces of the engine's reciprocating mass (including its piston, piston pin, piston pin bearing, and connecting rod) when the piston is adjacent its top dead center and bottom dead center positions. The counterweight member is slidably mounted on the crankshaft, and is captively retained thereon closely adjacent the flywheel, by a retaining sleeve also slidably mounted on the crankshaft. Alignable dimples on the counterweight and the flywheel facilitate the installation of the counterweight in the correct rotational orientation on the crankshaft. A narrow locking arm portion of the counterweight member is closely received and retained between an adjacent pair of cooling impeller blades on the flywheel to prevent rotation of the counterweight relative to the flywheel, thereby locking the counterweight in its correctly aligned rotational orientation. The counterweight, being independent of the flywheel, does not alter the balance of the flywheel and therefore does not impose a centrifugal bursting force thereon.
REFERENCES:
patent: 3415237 (1968-12-01), Harkness
patent: 4003265 (1977-01-01), Craig et al.
patent: 4262548 (1981-04-01), Haft et al.
patent: 4404706 (1983-09-01), Loyd
patent: 4522612 (1985-06-01), Frazer
patent: 4539864 (1985-09-01), Wiebe
Argenbright Tony M.
Carlberg Eric R.
White Consolidated Industries, Inc.
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