Worm-gear speed reducer

MF Worm-gear speed reducer

Our worm-gear reducers and worm-gear engine reducers are universal purpose. They have an identical midbody in all four versions (N-A-V). To achive those versions (N-A-V) the screws attaching the covers with feet to the gearbox must be removed and the covers turned to the desired position.

In order to achieve this in the (B-BC or P) version, the covers with two feet must be replaced by two covers: one of them simply aiming at closure, and the other having the appropriate flange (either normal B or short BC and P position).


Structural Features

The worm-gear reducer is made up of three main parts: housing, worm-gear and wheel.

The carcasses are made of GG-25 cast-iron, and are available for all kinds of gear-reducer. This make them perform efficiently under stressed conditions, vibrations or any kind of setback that cannot be avoided during the assembly

The worm-gear is made of hardened and quench-hardened steel, with ground- on teeth sides, and the crowns made of DIN (GZ-CuSn 12 Ni2) centricast bronze, melted on steel. Due to the mechanical work of these two parts having high quality, excellent performance and low noise levels have been achived.

The output shaft is hollow, although it is possible to adapt a solid shaft.

The oil seals made of NITRILE BUTADIENE, according to DIN 3760, high quality bearings, an EPOXY- impregnated finish ( 2 components), and grey-coloured SINGLE LAYER ENAMEL finish ( 2 components) ( RAL 7672), provide the most competitive gear reducer on the market.

Size 63

In the size 62 of the MF series, worm-gear reducers, the output hollow shaft of diameter 30 has been included, that substitutes to the output hollow shaft with diameter 25, from size 62. This variant has like reference size 63 and is born like answer to the request of our costumers since, upon mounting greater bearings in the output, bears greater axial loads that its analogous one in the MF-62 series. The rest of technical characteristic are identical to the its analogous in the size 62.

Assembly Position

In order to set up a gear reducer and to make it work efficiently, the following instructions must be taken into account:

  • It must be fixed on a flat surface to avoid either vibrations or tensions.
  • If undistributed loads or continued start-ups are foreseen, it is recommended to insert compensating couplings, connectors, torque limiters etc...
  • If the gear reducer had to be painted, the oil seals must be covered to prevent them from drying and losing their seal.
  • The machine work of the fittings set up in the output shafts need an ISO H7 or h6 margin for the hollow shaft.



It is wise to pay attention to this factor when the gear reducer output shaft is driven instead of being a driver. Bearing in mind that one of the features of this worm-gear reducer is the fact that cannot be axle-driven by the output shaft (irreversibility), it is almost impossible to meet total irreversibility conditions, due to external factors such as vibrations, etc. This is why, when the application requires total irreversibility, it is advisable to make use of external brakes with enough power to avoid slipping.

It could be said that the conditions under which irreversibility can happen are as follows:

• Efficiency < 0,55 (see table of technical features).



This kind of gear reducer is provided with a permanent lubrication, so it does not need any kind of maintenance.



The lubrication of this gear reducer type is constant and comes as standard, with high quality refined oil which has antirust and antiwear products with Fe, Cu and alloy protectors that has level of quality CLP DIN 51517-3, FGZ level 12, AP GL-4, US 224, AGMA 250-04; for that reason its maintenance is not needed.

