Before sending an orange customized car on a 60,000 mile world tour, igus replaced 56 of the car’s standard parts with iglide plastic bearings, including one bearing in the throttle valve.
The throttle takes the place of a carburetor on newer vehicles, and works by directly regulating the amount of air able to enter the engine, indirectly controlling the engine’s charge (the combination of fuel and air).
In the throttle valve, a combination aluminum/plastic bearing from an unknown manufacturer was stripped out, and retrofit with a standard iglide X6 bushing. The X6 material is extraordinarily resistant against high temperatures, and has a lifetime 6 times longer than its predecessor, iglide T500, in high temperature applications. The X6 bearing is able to withstand the long-term application temperatures that a bearing would experience inside the throttle valve.
The material is resistant to temperatures of up to 482ºF, and short term application temperatures of 599º are possible. Very low temperature applications are also possible with X6, as low as -148º – much lower than any car would typically encounter. The iglide X6 material also has up to 50% better press-fit with higher temperatures, meaning that it is resistant to relaxation up to 329ºF. At this point, the bearing should be axially secured, whereas iglide T500 must be secured at 275ºF. All plastics will relax once they reach a certain temperature, meaning they will shrink down to the size of the space they are pressed into.
The iglide X6 material is also resistant against a number of caustic materials, most importantly the gasoline and diesel fuels that the throttle comes into constant contact with, and it also possesses a very low moisture absorption rate to minimize the risk of the bearing swelling and eliminating necessary clearance. X6, like all iglide materials, has very low wear and friction characteristics, and is self-lubricating and maintenance-free thanks to the materials inclusion of tiny particles of solid lubricant that coat the shaft as friction occurs.
In this particular application, the bearing in the throttle valve moves in an oscillating fashion against the partner pin which is made from steel. The function of the bearing is to provide the rotational movement of the throttle valve mechanism. The iglide X6 material, like all iglide bearing materials, has been extensively tested in a variety of real-life application settings. The results from these tests have been compiled into an extensive database, which was used to create a lifetime prediction calculator for iglide bearings.