| 摘要 |
The invention relates to an eccentric gear for providing a speed difference between two machine elements (3, 4) which are rotatably journalled in relation to a reference member (2) and individually rotatable around a symmetry axis (C). The gear includes two pairs of co-operating gear rims (6, 7; 8, 9), one of which in each pair is eccentric in relation to the symmetry axis (C) and one of which is in the form of a male gear rim (6, 8) formed with out-turned teeth, and the other one (7, 9) is in the form of a female gear rim formed with in-turned teeth, which has a larger diameter than the appurtenant male gear rim (6, 7) in order to enable engagement of only a few of the teeth of the male gear rim in the female gear rim, one of the gear rims being arranged to roll off against the other one. According to the invention, one of the gear rims, e.g. the male gear rim, in each pair of co-operating gear rims is rigidly connected to a homologous gear rim in the other pair of gear rims and situated along a geometric axis (X) common for these two gear rims, which axis is eccentric and preferably oblique in relation to the symmetry axis (C) while the other gear rims are rotatable in relation to each other.
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