| 摘要 |
1. Toothed gear, in particular for driving rotary pistons of rotary pumps, composed of two shafts with mounted gears, characterised in that it has two pairs of wheels (5, 8 and 6, 9) with skew teeth, which together create a double-chevron transmission, and with the wheels mounted in a manner allowing for sliding along at least one shaft's axis, and the shaft has devices (5 and 6) locking wheels in desired position.<IMAGE>
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