| 摘要 |
PCT No. PCT/AU97/00533 Sec. 371 Date Feb. 19, 1999 Sec. 102(e) Date Feb. 19, 1999 PCT Filed Aug. 20, 1997 PCT Pub. No. WO98/07518 PCT Pub. Date Feb. 26, 1998In a nutating machine such as a high intensity comminution machine having a nutating drum (1), a support bearing is provided by pairs of rolling bearing surfaces (6 and 8, and 7 and 9). In order to reduce power requirements and wear, each pair of complementary contact paths traced out by the bearing surface pairs has an equal ratio of (a) the path length of the stationary bearing surface (8, 9) to (b) the path length of the nutating bearing surface (6, 7). In one embodiment, irrotational movement of the nutating element is achieved by having equal path lengths as between the stationary bearing surface and the nutating bearing surface in both pairs.
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