Crankshaft supporting and lubricating structure in plural-cylinder internal combustion engine.

摘要

The crankshaft (13) of an engine is supported by bearing caps (8) mounted on journal walls (7) of a cylinder block (B), and a bridge (9) interconnects the bearing caps. Oil passages (33) in each bearing cap lead from the bridge to each crankshaft journal bearing at a laterally offset location rather than on the cylinder axis (L). A longitudinal main gallery (30) in the bridge supplies oil to the said passages and is laterally offset even further to that side. An oil supply passage (34,3S) in the bridge and one bearing cap at one extreme lateral side supplies oil from a pressurized oil supply passage (37) in the cylinder block to the oil supply passages in the bearing caps.