Patent ID: 7845342
Filing Date: 2010-12-07
Classification: F02M,Y02T

Abstract:
1. A crankcase for an internal combustion engine, which is provided in the internal combustion engine in which blow-by gas that leaks from a combustion chamber into the crankcase is returned to an intake passage via a gas outflow passage formed in a cylinder block so as to extend in an up-down direction, the crankcase comprising: a partition wall that is formed so as to face an inner side surface of a case outer wall which extends in the up-down direction and so as also to extend in the up-down direction; an internal space that is connected at an upper end portion to the gas outflow passage is formed between the partition wall and the inner side surface of the case outer wall; and a window that passes through the partition wall in a horizontal direction is formed in the partition wall to provide communication between the internal space and an outside of the internal space, wherein the window includes a lower window that is formed at a lower end of the partition wall and an upper window that is formed above the lower window in the partition wall.