Patent ID: 7690367
Filing Date: 2010-04-06
Classification: B62K,F01M,F02F

Abstract:
1. An internal combustion engine comprising: a crankcase; a cylinder head disposed above the crankcase; a cylinder head cover attached to cover an upper side of the cylinder head; an ignition plug provided with a plug part inserted into the cylinder head and a plug cap covering the plug part and disposed outside the cylinder head cover; wherein the cylinder head cover includes a substantially U-shaped gas passage arranged so as to surround the plug cap of the ignition plug as viewed from an insertion side of the ignition plug, the gas passage arranged to allow fuel gas containing oil to flow in from the crankcase; the gas passage includes: the gas passage of the cylinder head cover includes a plurality of partition walls provided inside the gas passage; a first partition wall of the plurality of partition walls extends between the first passage and the third passage and a second partition wall of the plurality of partition walls extends between the second passage and the third passage; the plurality of partition walls are arranged to restrain an increase in a flow rate of blow-by gas flowing in the first, second, and third passages; and each of the first partition wall and the second partition wall extends around a hole arranged to receive a member to be attached to the cylinder head cover.