| 摘要 |
An engine includes a balancer having dual, oppositely rotating balance shafts designed to provide oppositely rotating unbalance couples which combine to provide a pitching couple to the associated engine frame and which balances a pitching couple developed in the engine rotating and reciprocating components. First and second balance shafts mounted on opposite sides of the engine frame are driven in opposite rotation at twice crankshaft speed by a sprocket and chain drive at the rear end of the engine. The balance shafts each have longitudinally-spaced, oppositely facing balance weights that develop equal and oppositely rotating unbalance couples which combine to generate a vertical pitching couple equal to and opposing the second order pitching couple of the engine. In a preferred embodiment, the drive includes reversing gears that provide opposite rotation of one of the balance shafts. Additional features are included.
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