Balancer shaft for two cycle engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorToshikazu Ozawa
Life of this patent
Estimating the term…
Abstract
A balancer shaft arrangement for a two cycle, crankcase compression, internal combustion engine wherein the balancer shaft is driven from the crankshaft and is disposed below the crankcase and externally of it. The balancer shaft is driven from end of the crankshft and a flywheel is driven at the other end of the crankshaft. The balancer shaft axis is disposed at a lesser distance from the crankshaft axis than the radius of the flywheel so as to provide a compact assembly.
Claims18
A balancer shaft arrangement for an internal combustion engine comprising a crankcase defining at least one crankcase chamber in which a crankshaft rotates, a cylinder block extending from one side of said crankcase and defining at least one cylinder bore receiving a piston driving said crankshaft, a balancer shaft chamber contiguous to but sealed from said crankcase chamber, and a balancer shaft driven by said crankshaft and contained within said balancer shaft chamber.
A balancer shaft arrangement for an internal combustion engine comprising a crankcase defining at least one crankcase chamber in which a crankshaft rotates, a cylinder block extending from one side of said crankcase and defining at least one cylinder bore receiving a piston driving said crankshaft, a balancer shaft journalled on an axis parallel to the axis of rotation of said crankshaft, and means for driving said balancer shaft from said crankshaft comprising belt drive and tension and idler pulleys disposed on opposite sides of said balancer shaft axis for rotating said balancer shaft in a direction opposite to the direction of rotation of said crankshaft.
Dependencies are inferred from the claim text.