In developing the H1 series, as well as optimising and improving the electro-hydraulic system itself, Sauer-Danfoss also focused on optimising the base components within the hydraulic pumps and motors. Schaeffler’s new X-life cylindrical roller bearings with optimised rib contact have made an important contribution to these design improvements.

The special curvature of the roller end faces improves the contact geometry between roller end faces and the bearing ribs, minimising contact pressures. This enables the formation of a load carrying lubricant film, whereby roller end faces and ribs are completely separated by the lubricant. The rollers now slide on the lubricant film under axial load. This means that the new cylindrical roller bearings can operate with a much higher ratio of the axial load to the radial load. At the same time, the frictional torque is up to 50% lower, depending on the magnitude of the axial load. The benefits are lower operating temperatures, higher efficiency and reduced energy consumption.