| 摘要 |
A gearbox, for a car seat height adjustment mechanism, comprises a housing 90, an input shaft 10 having an input portion (12, fig 4), an output portion (18), a first eccentric lobe (14), and a second eccentric lobe (16). A first internally toothed 'gear 30 is rotatably mounted on the first eccentric lobe (14) and an internally toothed output gear (54) is rotatably mounted on the output portion (18) of the input shaft (10). An externally toothed orbiting gear 70 is rotatably mounted on the second eccentric lobe (16) and arranged to mesh with both the first internally toothed gear 30 and the internally toothed output gear (54), wherein the first internal toothed gear 30 has a first number of teeth different from a second number of teeth of the internally toothed output gear (54) and a locating means (110) prevents rotation of the first internally toothed gear 30 relative to the housing 90, whilst allowing translational movement of the first internally toothed gear 30 in a plane perpendicular to a rotational axis of the input shaft 10. a method of manufacturing is also disclosed.
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