Patent ID: 6923154

Claim:
An internal-combustion engine having a cylinder block and crankcase, comprising: a case structure which has at least two cylinders or cylinder bank rows arranged in a V-shape with respect to one another, and an endless drive extending on a face of the cylinders or cylinder bank rows, which drive comprises a timing chain, for connecting a crankshaft with camshafts arranged in cylinder heads, the timing chain being covered by a timing drive cover, wherein the timing drive cover or the case structure situated opposite the timing drive cover has a ribbing by way of which a targeted separation or return takes place of oil carried along by the timing chain in a direction of the cylinder heads, wherein the ribbing has a main rib which extends within the timing chain in a curved shape in the direction of the cylinder heads, at least one oil return opening being provided in an apex area of the main rib, and wherein two ends of the main rib are adjoined by a ribbing structure comprising several partial ribs, individually, the partial ribs serving as an oil guiding or oil collecting duct for oil flowing back from camshaft driving wheels.