posted on 2019-08-06, 08:39authored byNick MorrisNick Morris, Rishi Patel, Homer Rahnejat
The parasitic drag losses incurred by wet clutches, used in transmission systems, can significantly
affect vehicular powertrain efficiency. This paper presents a novel implicit solution for hydrodynamic
parasitic drag losses of disengaged clutches. These are generated by conjunctional friction, taking into
account lubricant film separation during co-directional and counter-directional disc pair rotations.
Lubricant film rupture is considered through application of incipient reverse flow boundary condition,
which is representative of lubricant film separation. The results point to the operating conditions at
which significant power losses occur. In particular, the time efficient model is able to represent the
small losses incurred during co-directional rotation of disc pairs.
Funding
J.C. Bamford Excavators and Innovate UK.
History
School
Mechanical, Electrical and Manufacturing Engineering