| 摘要 |
PURPOSE:To improve recovery of oil and also prevent gathering of oil by providing a groove part for inflow of oil contained in blow-by gas and an oil return port ranging with the groove part on the bottom of a hollow chamber of a frame member connected to a steering head pipe. CONSTITUTION:A frame member 3 is welded to a steering head pipe 2 of a motorcycle and a hollow chamber 18, long and narrow, is formed in the longitudinal direction of a body by means of right and left side plates of said member. Said chamber 18 communicates with an air cleaner case 21 through a joint 20, while the air is supplied to carburettors 11, 11 of both cylinders 7, 8 through the hollow chamber 18. On the other hand, said chamber 18 is put in communication with the interior of a head of the rear cylinder 8 through a joint 25 and a breather pipe 26, and blow-by gas of an engine 6 flows back. A groove part 27 for flowing of oil in the blow-by gas, and a groove 29 communicating with said groove, are provided on the bottom 17 of the hollow chamber 18 and this oil flows back to the interior of the head of the front cylinder 7 through an oil return port and a breather pipe 30. |
