Carrier 1 is designed as housing a which rotates about axle shafts A and B. Shafts A and B are perpendicular to the plane of the drawing. Four identical planet worms 2 are connected by turning pairs to housing a and mesh with each other in pairs and with worm wheels 3 and 4. Wheels 3 and 4 are keyed to axle shafts A and B. The speeds n₁, n₃ and n₄ of housing a, and of worm wheels 3 and 4 are related by the equation n₁=(n₃+n₄)/2.
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