Worm gearboxes · STM Polska
VMR worm gearboxes
VMR worm gearboxes are compact worm gear reducers that cut motor speed and raise torque on industrial drives. Sizes run from 30 to 150. A worm drives a bronze worm wheel, which gives a high reduction in a small envelope and keeps the drive quiet. The series is built around modification: shafts, bushes and diameters can be changed, so the gearbox fits the machine you already have rather than the other way round.
Housings are die-cast aluminium in sizes 30 to 90, which keeps the assembly light and simple to mount. Sizes 110 to 150 are cast iron, for stiffness, load capacity and stable running in harder conditions. Inside, the worm is hardened steel and the worm wheel is bronze, the material pairing that gives a worm gearbox its working life and its quiet running.
Mounting is by feet, by side flange or with the FA to FE flange series, so the unit bolts onto most machine faces without an adaptor. Output shafts are available single or double ended where torque has to leave the gearbox on both sides. A torque arm steadies the unit and takes reaction forces off the housing. Where the connection is not standard, shafts, bushes and modified diameters can be made to your drawing.
Sizing starts with the output speed and the torque needed at the output shaft, because those two fix the ratio and the size. The lighter aluminium sizes, 30 to 90, cover light and medium duty. We move to cast iron, 110 to 150, for higher loads, more frequent working cycles or harder surroundings. Heavy dust, damp and raised ambient temperature also change the housing material and the sealing accessories we specify.
VMR gearboxes run conveyors, feeders, packing systems, industrial automation and straightforward machine drives, and they take S1 continuous duty when sized for the load. Send us the load data, the speeds and how the gearbox has to mount, and we will come back with a configuration and a quote within one working day.
Main features
Aluminium housings 30 to 90, cast iron 110 to 150
Hardened steel worm running on a bronze worm wheel
Feet, side flange or FA to FE flange mounting
Shafts, bushes and diameters made to your drawing
Single or double ended output shafts available
Suited to S1 continuous duty when correctly sized
Specifications
- Sizes
- 30 to 150
- Aluminium sizes
- 30 to 90
- Cast iron sizes
- 110 to 150
- Flange options
- FA to FE
- Duty
- S1 continuous
| Housing | Die-cast aluminium 30 to 90, cast iron 110 to 150 |
|---|---|
| Worm | Hardened steel |
| Worm wheel | Bronze |
| Mounting | Feet, side flange or FA to FE flanges |
| Output shaft | Single or double ended |
| Modifications | Shafts, bushes and diameters to drawing |
| Accessories | Torque arms, output shafts |
Applications
- Conveyors
- Feeders
- Packing systems
- Industrial automation
- Simple machine drives
Documentation
Catalogue, ratio tables and dimensional drawings for the VMR series are sent with every quotation. Request the documentation.
Questions about the VMR series
What is a VMR worm gearbox made of?
The housing is die-cast aluminium in sizes 30 to 90 and cast iron in sizes 110 to 150. The worm is hardened steel and the worm wheel is bronze, a pairing that runs quietly and wears predictably. Aluminium keeps weight off light machine frames, while cast iron gives the stiffness that heavier loads and longer duty cycles need.
Which VMR sizes suit a heavier load?
Work out the output speed and the torque first, then pick the material. The aluminium sizes, 30 to 90, suit light and medium duty. For higher loads, more frequent cycles or dusty, damp or hot surroundings we move to the cast iron sizes, 110 to 150. Send us the duty and the working environment and we will confirm the size.
How does a VMR gearbox mount to my machine?
Three ways: on feet, on a side flange, or with the FA to FE flange series. Pick the one that matches the space and the machine face. Add a torque arm where the gearbox has to take reaction forces, and choose a single or double ended output shaft depending on which side the driven shaft sits on.
Can the shafts be made to suit my machine?
Yes. The VMR series is designed to be modified: non-standard shafts, bushes and altered diameters are part of the range, so the gearbox can go into an existing drive without redesigning the coupling. Send the drawing, or the dimensions of the shaft it has to meet, and we will confirm what can be made.
Will a VMR gearbox run all day?
Yes, VMR units suit S1 continuous duty when the size matches the load. Continuous running is a question of heat as much as torque, so tell us the ambient temperature and how enclosed the gearbox will be. Frequent starts also work a worm gear reducer hard, so mention the cycle rate and we will allow for it.
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Request a quotation
Quote for vmr worm gearboxes
Reply within one working day with a price, a lead time and the datasheet.
What lets us quote first time
- Ratio
- Input: IEC motor frame or free shaft
- Output torque or motor power
- Hollow bore, mounting position