A rack-and-pinion actuator is the robust solution when large or heavy window sashes need to be opened reliably and the actuator may be mounted visibly. It works with a toothed rack, achieves high forces and, thanks to its closed design, is also suitable for outdoor use. Here you will learn how a rack-and-pinion actuator works, where its strengths lie and how to find the right model.
In brief: A rack-and-pinion actuator pushes the sash open via a toothed rack and achieves high forces. Thanks to its enclosed design, it is also suitable for outdoor installation. Typical uses are large bottom-hung and top-hung sashes, continuous rooflights and rooflight domes, where the actuator may be mounted visibly.
How a rack-and-pinion actuator works
An electric motor drives a pinion via a gearbox. The pinion engages a straight toothed rack and pushes it out of the housing or pulls it back. The rack is connected to the sash and opens or closes it. At the end of the stroke, the actuator switches off automatically, see End-position cut-off.
Where are rack-and-pinion actuators used?
- Large bottom-hung, top-hung and side-hung sashes in facades and continuous rooflights
- Pivot sashes and wide top-hung windows
- Rooflights on hall and flat roofs
- External mounting, where dust and rain hit the actuator
- SHEV and ventilation systems, if actuator, window and control panel are matched for the specific project
Rack, chain or spindle?
| Criterion | Rack and pinion drive | Chain drive | Spindle drive |
|---|---|---|---|
| Force | hoch, z. B. 800 N | meist 250 bis 1.000 N | bis 5.000 N |
| Mounting | visible on the frame | kompakt, fast unsichtbar | with push rod next to the sash |
| Robustness | very high, also outdoors | gut, eher innen | hoch |
| Typical use | large sashes, rooflights, outdoors | Fassadenfenster, Oberlichter | schwere Lichtkuppeln, Klappen |
Read more about the other designs in the guides Chain drive, linear drive or rack and pinion drive and Spindle actuator for windows and skylights.
Choosing the right rack-and-pinion actuator
- Force: It depends on the sash weight, the installation position and the distance to the pivot point. Plan a reserve for wind and snow, see Calculate thrust.
- Stroke: It determines the opening width. Choose it to suit the sash geometry, see Stroke length.
- Schutzart: A high degree of protection is important for outdoor installation, see Schutzart IP.
- Voltage and control: 24 V actuators are common for ventilation with sensors and for SHEV, see Window control.
- Large sashes: Two actuators in synchronous operation prevent the sash from twisting, see tandem operation.
Rack-and-pinion actuators from Vent Systems
- VS-ZA 800 rack-and-pinion drive: 800 N push and pull force, stroke 100 to 800 mm, stainless steel rack, protection class IP65.
- VS-ZA-i smart rack-and-pinion drive: 600 N or 800 N, with synchronisation function, bus integration and weather protection.
All models are available from stock in Hamburg. You can find the overview in the category Rack-and-pinion drives.
Frequently asked questions
Can I mount a rack-and-pinion actuator outdoors?
Yes, if the protection class is right. The VS-ZA 800 has IP65 and is therefore dust-tight and protected against water jets.
Is a rack-and-pinion actuator louder than a chain actuator?
That depends on the model. For rooms where quiet matters, see the guide How loud is an electric window actuator?
When do I need two actuators?
For wide or heavy sashes. Two synchronised actuators distribute the force evenly and protect the sash and hardware.
Consultation
Send us dimensions, weight and a photo of your window via the Contact form. We will recommend the right rack-and-pinion actuator for you.