Machine element or mechanism – Elements – Cranks and wrist pins
Patent
1986-10-17
1988-03-15
Smith, Gary L.
Machine element or mechanism
Elements
Cranks and wrist pins
74603, 123192R, F16C 304
Patent
active
047305126
ABSTRACT:
A crankshaft for a V-6 type of internal combustion engine having longitudinally spaced journals and crank pins connected by a series of nine arms numbered from the front end to the rear end of the crankshaft is provided with counterweights on the first, second fifth, eighth, and ninth arms only. A line between a longitudinal axis of the crankshaft and an axis of a forwardmost crank pin defines, with the longitudinal axis, a reference plane. The centers of gravity of the first and ninth counterweights lie in the reference plane on opposite sides of the longitudinal axis and balance each other. The centers of gravity of the second and eighth counterweights are disposed counterclockwise and clockwise in the same quadrants, respectively, from positions that are 150 degrees and 30 degrees clockwise from the reference plane, when the crankshaft is viewed from the front. Preferably, the centers of gravity of the second and eighth counterweights are located 135 degrees and 45 degrees, respectively, clockwise from the reference plane. The fifth counterweight balances the second and eighth counterweights.
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Fukazawa Susumu
Ito Eiji
Lindsey Rodney M.
Smith Gary L.
Toyota Jidosha & Kabushiki Kaisha
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