Patent ID: 7500476

Claim:
A cylinder head cover for an internal combustion engine having a cylinder head, said cylinder head cover covering an upper portion of said cylinder head and having a breather apparatus formed therein, said breather apparatus comprising a part of the cylinder head cover which projects upwardly and which comprises a top wall and a peripheral wall which cooperate to define a breather chamber having an open bottom; said breather apparatus further comprising a plurality of component pairs which project from an inside surface of the top wall in the breather chamber, each component pair comprising a fixing boss and a rib which is coextensive and integrally formed with its associated fixing boss; wherein the cylinder head cover further comprises a breather plate fixed to the fixing bosses, the breather plate effectively covering the open bottom of the breather chamber, the breather chamber being partly partitioned by the ribs thereby defining a plurality of gas flow paths leading from a blowby gas inflow port to a blowby gas outflow port; wherein each of the ribs extends obliquely from a respective side portion of the peripheral wall, relative to a direction in which blowby gas flows in through the inflow port, each of the ribs extending up to where it is continuous with one of the fixing bosses; and wherein each of the ribs has a projecting lower edge portion which is partly cut out forming a concave portion.