| 摘要 |
PCT No. PCT/JP90/00893 Sec. 371 Date Apr. 1, 1991 Sec. 102(e) Date Apr. 1, 1991 PCT Filed Jul. 11, 1990 PCT Pub. No. WO91/02909 PCT Pub. Date Mar. 7, 1991.In a built-up flywheel comprising a first flywheel (12), a second flywheel (30) and a clutch covering body (32), a cooling mechanism is provided which has a cooling port (52) formed in the inner periphery of said second flywheel (30) and a cooling groove (50) arranged generally radial at the front surface of said second flywheel (30) so as to rake the air inside said clutch covering body (32) discharged from said cooling port outwards in a radial direction. The cooling port (52) forms a circulating route of the cold air, so that the atmospheric cold air can be effectively supplied into the clutch covering body (32), and the frictional face of the second flywheel (30) can be cooled. Moreover, the cooling groove (50) works to discharge the air inside the clutch covering body (32) positively outside through the cooling port (52), rendering the pressure inside the clutch covering body (32) negative, whereby the atmospheric cold air can be further positively supplied into the clutch covering body (32 ).
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