Throttle controls on ships and tankers traditionally employ a relay signal to a device in the engine room that actually controls fuel flow and how fast the ship's engine turns.
A shipbuilding company making diesel-powered freighters was having problems with their throttle control system. Vibrations and a harsh operating environment were introducing play into throttle linkages in the engine room, reducing accuracy.-The solution involved the Uhing "rolling-ring" drive, a mechanical device that smoothly translates rotary motion into linear motion.
The installed system has a stroke length of 80 mm for the throttle and works despite temperatures that soar to 158F. It tightly couples the throttle controls on the bridge to engine fuel settings and is unaffected by vibrations. The rolling-ring drive does not use a threaded shaft, so there's no place for
dirt and oil to accumulate. And the lack of threads means there is little wear that might inject play into the throttle control. The drive also has no backlash, so rotary motion from the shaft is immediately converted to a linear output, even when put in reverse.