Lubrication system for engine
AssigneeYamaha Marine Kabushiki Kaisha
InventorMasanori Takahashi
Life of this patent
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Abstract
A marine engine incorporates an engine body defining first and second bearing sections. A crankshaft is journaled at the first bearing section for rotation about a first axis extending generally vertically. A balancer shaft unit is journaled at the second bearing section for rotation. The balancer shaft unit includes two balancer shafts rotating about second and third axes both extending generally parallel to the first axis and also parallel to each other. The crankshaft rotates the balancer shafts. The balancer shafts have balancer weights. A lubrication system delivers lubricant to the first and second bearing sections.
Claims22
An internal combustion engine comprising an engine body defining first and second bearing sections, a crankshaft journaled at the first bearing section for rotation about a first axis extending generally vertically, a balancer shaft journaled at the second bearing section for rotation about a second axis extending generally parallel to the first axis, the crankshaft rotating the balancer shaft, the balancer shaft having at least one balancer weight, and a lubrication system arranged to deliver lubricant to the first and second bearing sections.
An internal combustion engine comprising an engine body formed with a primary portion and a secondary portion, the primary portion defining an opening, the secondary portion closing the opening, the primary portion defining a first bearing section, the secondary portion defining a second bearing section, a crankshaft journaled at the first bearing section for rotation about a first axis extending generally vertically, a balancer shaft journaled at the second bearing section for rotation about a second axis extending generally parallel to the first axis, the crankshaft rotating the balancer shaft, the balancer shaft having at least one balancer weight, and a lubrication system arranged to lubricate the first and second bearing sections, the primary and secondary portions together defining a lubricant passage through which lubricant flows from the primary portion to the secondary portion.
Dependencies are inferred from the claim text.