Abstract
Abstract 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 codirectional and counter-directional disk 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 codirectional rotation of disk pairs.
Highlights
Wet clutch packs are used widely in a variety of applications, including for dual clutch automatic transmissions of commercial passenger vehicles, motorbikes and with transmission systems of offhighway vehicles
The results presented show the disengaged drag toque during co-directional and counter-directional rotations of wet clutch discs at varying relative disc speeds
The variation of drag torque at various co-directional and counter-directional rotations is shown in figure 5
Summary
Wet clutch packs are used widely in a variety of applications, including for dual clutch automatic transmissions of commercial passenger vehicles, motorbikes and with transmission systems of offhighway vehicles. In off-highway vehicle transmissions, wet clutches are used to engage and disengage shafts with different drive ratios. Multiple friction discs are inserted onto a male-splined shaft. These friction plates are interspaced by separator plates, retained by the clutch basket so that they would rotate with the secondary shaft. On and off-highway applications a wet clutch system is preferred as the technological solution with high applied torques [1]. This is because the lubricant flow across the friction and separator disc faces mitigate undue thermal, dynamic and wear phenomena [1, 2]. The introduction of a viscous medium to the narrow annular conjunction, formed when the clutch pack is disengaged, can generate unwanted parasitic energy losses [3, 4]
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