Air over oil, oleopneumatic suspensions were first introduced into the WABCO off-highway HAULPAK trucks in 1957. The HYDRAIR suspension system was developed to function as a soft spring and shock absorber for off-highway construction vehicles, providing better operator control, increased vehicle life, and reduced shock loads.
This paper will deal with the development of the latest generation of this suspension, which is much simpler in design, has longer life, higher reliability, and still maintains the desirable features contained in the original HYDRAIR suspension.
