Solution
The use of
iglidur W300 bearings in the chain tensioner today enables both axial and rotary movement of the roller. This eliminates the need for time-consuming alignment during installation. The result is faster assembly, easier service and no more chain jump out.
For the adjustment of the cranks at the height of the upper body, parallel guide rods have been developed which allow a torsion-resistant linear movement. iglidur W300 bearings were used in pairs, spaced apart for each rod, to enable a linear motion with low friction, high service life and minimum space requirement between bearing and rod. Due to the low installation height, rigidity is achieved, noise is minimised and the steel bars are less susceptible to damage. All crank arms can be connected to each stroke by machine; thus eliminating the need for hand tuning.
For the last application on the prototype, a design consisting of a crank arm bearing with a set of iglidur W300 ball bearings was developed, which slides along a pair of parallel steel rods. Also included is an
igubal ball bearing that activates a steel pin attached to the crank arm bearing. The crank arms are now sufficiently stiff and misalignment due to inaccuracies in the bike frame and assembly, as well as user loading, is compensated for without placing extreme stress on the machine and crank mechanism as was the case with previous prototypes.