Transmission reducer to be directly applied in the frame of the crankshaft of concrete mixers, or to be set up in a rigid, autonomous box, to be used in traction or elevation machines.;The reducer is made up of a set of interconnected pieces, positioned according to picture 1, which has a small driving pulley (18) joined by one or more trapezoidal chains (13) to the mixed pulley (12), this pulley is fixed in the same axis to a small gear wheel which transmits the movement to a double rack (19), this rack receives and transmits movement through chains of links (1) and has two gear wheels, parallel and in the same axis, one of the wheels has a big diameter and the other has a small one; the reduction is finalized by a large diameter gear wheel (4) which is fixed in the same axis (8), and this is applied in the basis of the concrete mixer's bucket or in the axis of the machine, in order to transmit rotation.
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