Economic and technical pressures to reduce the unit size-to-cost ratio of hydrokinetic drives demand the continued development of friction elements and accurate assessment of their properties. Machine testing provides results quicker than vehicle testing but existing machines are insufficiently flexible to simulate all conditions of vehicle usage. A High Speed Transmission (H.S.T.) Rig has therefore been designed to cover a wider range of conditions than currently met in service; a significant feature of its operation is the maintenance of a constant engagement time and therefore a constant work rate at each specific stage. This ensures true comparison between materials of differing friction coefficients. Results of testing are presented which enable an appreciation to be made of the friction and wear of the main material types and their inter-relationship with pressure/velocity, temperature, fluid specification and the effect of facing grooves. Good correlation with car test results confirms the ability to simulate on-vehicle conditions.
The high speed transmission rig (an inertia dynamometer for the testing of automatic transmission friction elements)
Das Hochgeschwindigkeitsgetriebe (ein Traegheits-Dynamometer fuer die Pruefung der Reibungselemente automatischer Getriebe)
1977
7 Seiten, 8 Bilder
Aufsatz (Konferenz)
Englisch
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