Robust and lightweight polymer bearing technology for use in the Mars rover

The application is a remotely operated vehicle - a robot equipped with a 6 DoF manipulator, video system and remote measurement system. The rover has been built for environmental conditions similar to those on the surface of Mars. It has to fulfil a number of requirements that are often contradictory: Low weight, a robust and enduring structure, flawless function, long operating times without interruption, compact design and many more. Special challenges therefore also applied to the suspension arms and steering knuckles. The components had to be particularly light, while also being able to withstand the particularly dusty environmental conditions on Mars, which are characterised by strong temperature fluctuations. As maintenance measures are not possible during use, they must also be as maintenance and lubrication-free as possible.

The researchers considered igubal ® rod end bearings and iglidur ® G-bearing of type F as the bearing solution for the high requirements resulting from the use on the surface of Mars. These were attached to the problem areas that connect the suspension arms and a steering knuckle. They enable the production of a very durable and above all lightweight mobile 3-DoF connection, which is also resistant to particularly harmful atmospheric conditions. Furthermore, the iglidur® G-bearing of type F was used for the construction of the manipulator and for the bearing assembly of the suspension joints, with the most important aspects being trouble-free performance, infrequent maintenance checks and, above all, a compact and lightweight structure.