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Automatic throttle system
In the aircraft simulator
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Technical data:

  • What was needed: A replica of the throttles for simulated 737 NG and 737MAX aircraft which can be easily adjusted either automatically by the autopilot or manually
  • Requirements: Reduced installation space with the same functionality, robust enough to be used in all climate zones in the long term, possible reverse drive, cost-effective, no lubrication or maintenance, corrosion-free
  • Products used: dryspin® high helix lead screws with matching lead screw nuts in 50mm pitch supported by drylin® R linear slide bearings
     
  • Success for the customer: The lead screw drives were used to control the two throttle levers. The system worked so well that a similar system was used to drive the speedbrake lever (to control the simulated air brakes) mounted in the same throttle module. The products were the perfect blend of low cost, high reliability, and very simple reverse control. The low costs made it possible to meet the target price for the simulated throttle valves. High reliability means no need to worry about units wearing out or failing in the field. Simple reverse control means that the lead screws are very easy to turn back, giving the levers the perfect feel and power.
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Aircraft throttle
Aircraft throttle

Aircraft throttle application description

From Flight Deck Solutions

Describe your system/machine/project. What is the function of your application? Where is your application used?
Our application is a simulated throttle valve for simulated 737 NG and 737MAX aircraft. The high-pitch lead screws we selected are used to replicate the auto-throttle system in the real aircraft. This system allows the autopilot to move the throttle automatically to control airspeed. Manual control can be assumed when the automatic throttle is deactivated. There can also be  a manual override if the automatic throttle is activated, but manual control is still required.

What are the environmental conditions at the end user's location? What challenges did you have to overcome to adapt to those conditions?
The environmental conditions are typical indoor conditions worldwide. The system can be used in very hot and humid places and very cold and dry areas. The biggest challenge in recreating the automatic accelerator pedal system was to make it smaller while maintaining full functionality. The real aircraft system is connected with cables that run throughout the aircraft. We had to put the whole system into the part of the throttle above the floor. The next major challenge was designing a system that would allow both automatic and manual throttle control and manual override of the automatic throttle system.

What requirements did the lead screw drives have to meet?
The lead screws and lead screw nuts had to be robust enough to be used in all climate zones long term. And they had to be driven in reverse so pilots could override the automatic throttle system and control the throttle valve manually.

What alternatives to lead screw drives were considered? 
We considered such options as belt drives, standard bronze-lead nuts, and direct servo drive. They were all either too big, too expensive or couldn't be adequately driven in reverse.

Which polymer bearing technology solutions do you use?
We used the dryspin high helix lead screws and lead screw nuts with 50mm pitch supported by 3/8" igus high-precision linear bearings.

Aircraft throttle
At which points? How did the products solve your problems?
The lead screws and bearings were used to control the two throttles (one for each engine). The system worked so well that we used a similar system to drive the speed brake lever (to control the simulated air brakes) mounted in the same throttle valve module. The products were the perfect blend of low cost, high reliability, and very simple reverse control. The low costs enabled us to meet the price targets for the simulated throttle valves. High reliability means that we do not need to worry about units wearing out or failing. Simple reverse control means that the lead screws are very easy to turn back, giving the levers the perfect feel and power.

Products used

High helix lead screw

Lead Screw

High helix lead screw nut

Lead screw nuts

Linear slide bearing

RJIP

Do you have questions about drylin® lead screw technology?

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