Crankshaft supporting structure for multicylinder internal...

Details Crankshaft supporting structure for multicylinder internal... Crankshaft supporting structure for multicylinder internal...

F - Mech Eng,Light,Heat,Weapons

02

F

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F02F 7/00 (2006.01) F01M 11/02 (2006.01) F02F 1/10 (2006.01) F02B 75/18 (2006.01)

Patent

CA 1329901

ABSTRACT OF THE DISCLOSURE A crankshaft supporting structure in a multi-cylinder internal combustion engine has a cylinder block made of a light alloy and including a cylinder housing and a crankcase having a plurality of spaced journal walls. A plurality of spaced bearing caps made of an iron alloy are coupled respectively to the journal walls. A crankshaft is rotatably supported in bearing holes defined by the journal walls and the bearing caps. A bridge made of a light alloy extends across the bearing caps and is coupled to the bearing caps. The bearing caps and the bridge are fastened together to the journal walls by connecting bolts disposed one on each side of the crankshaft. The bridge has a main portion defining a main gallery extending longitudinally therethrough and a plurality of legs coupled to the bearing caps, respectively. The bearing caps and the legs jointly define branch oil passages communicating with the main gallery and the bearing holes. In one embodiment of the invention, each of the oil passages has a longi- tudinal central axis displaced transversely from the central axis of the cylinder housing passing through the center of the crank- shaft.

496289

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