Worm gear motor

Worm gear motor

KM Worm gear motor

Our KM series, worm and wheel gear motor, is manufactured from an injected aluminium box. The cubic gearcase of our worm gear motor allows the adaptation by anyone of its three mechanized faces.

As the monobloc housing supports by itself the stresses between the worm and the wheel, the resistance of the whole gearbox is guaranteed. This is the reason that we keep suitable rigidity standards for our worm gear motor, although the service factor is lower with regard to cast-iron gears.


Structural features


The worm gear consists of three fundamental parts : housing, worm and wheel.

For all frame sizes, housings are made from injected aluminium, which lend this series an optimum performance when used in applications requiring low torque, and an efficiency similar to the one of cast-iron products.

The worm is made of casehardened quenched steel, with ground-on teeth sides, and the wheel is made of DIN (GZ-CuSn 12 Ni2) centricast bronze, melted on steel. Due to the quality of these two parts mechanical features, this series offers excellent performance and low noise levels.

Supplied with hollow shaft. Available with cylindrical output shaft.

With its other features, as NITRILE-BUTADIENE rubber ring seals ñ according to DIN 3760 regulation -, high quality bearings, and an aluminium finish, this product is the best choice within this productís family in the gears market.


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 nonwished
  • If undistributed loads or continued start-ups are foreseen, it is recommended to insert compensating couplings, connectors, torque limiters etcÖ.
  • If the gear reducer had to be painted, the detents 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, etcÖ 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:

• output  < 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 CLP DIN 51517-3, FGZ level 12, AP GL-4, US 224, AGMA 250-04 level of quality; for that reason its maintenance is not needed.




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