Crankshaft supporting and lubricating structure for multicylinder internal combustion engines
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorNobuo Anno
Life of this patent
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Abstract
The crankshaft of an engine is supported by bearing caps mounted on journal walls of a cylinder block and a bridge interconnects the bearing caps. Oil passages in each bearing cap lead from the bridge to each crankshaft journal bearing at a laterally offset location rather than on the cylinder axis. A longitudinal main gallery in the bridge supplies oil to the passages and is laterally offset even further to that side. A supply passage in the bridge and one bearing cap at one extreme lateral side supplies oil from a pressurized oil supply passage in the cylinder block to that supply passage in the bearing cap.
Claims14
A crankshaft supporting and lubricating device in a multicylinder internal combustion engine having a plurality of bearing caps secured to a plurality of journal walls of a cylinder block rotatably supporting a crankshaft between the bearing caps and the journal walls with a bridge interconnecting the bearing caps, the improvement comprising, said bearing caps and said bridge having a plurality of branch oil passages defined therein for supplying lubricating oil to bearings of the crankshaft, said branch oil passages being deviated to one side from a cylinder axis passing through the center of said crankshaft, said bridge having a main gallery defined therein in communication with said branch oil passages and also deviated to said one side, said bridge and one of said bearing caps having an oil passage defined therein on said one side and providing communication between said main gallery and a pressurized oil source.
A crankshaft supporting and lubricating device in a multicylinder internal combustion engine having a cylinder block with a plurality of journal walls and a passage from a pressurized oil source, a bearing cap secured to each journal wall for rotatably supporting a crankshaft, and a bridge interconnecting the bearing caps, the improvement, comprising, a plurality of branch oil passages in the bearing caps and bridge for supplying lubricating oil to bearings of the crankshaft, said branch oil passages being located to one side of a cylinder axis passing through the center of said crankshaft, said bridge having a main gallery defined therein in communication with said branch oil passages and also located to said one side, and a supply oil passage in said bridge and one of said bearing caps on said one side and providing communication between said main gallery and the oil source.
Dependencies are inferred from the claim text.