| 摘要 |
The ring has an assembling zone (Z1) tightly fixed in a bore of a crankshaft (3) of an engine (4), and a positioning zone (Z2). The positioning zone receives and maintains a centering unit (2) of a gearbox without tightening, and has an outer dimension smaller than the assembling zone. The assembling zone and the positioning zone are arranged at the ends of the ring.
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