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Title: Tribodynamics of a new declutch mechanism aimed for engine downsizing in off-road heavy-duty vehicles
Authors: Dolatabadi, Nader
Rahmani, Ramin
Theodossiades, Stephanos
Rahnejat, Homer
Blundell, Guy
Bernard, Guillaume
Keywords: Off-road heavy-duty vehicle
Clutch disconnect
Dynamics
Tribology
Issue Date: 2017
Publisher: © SAE International
Citation: DOLATABADI, N. ... et al, 2017. Tribodynamics of a new declutch mechanism aimed for engine downsizing in off-road heavy-duty vehicles. SAE Technical Paper 2017-01-1835.
Series/Report no.: SAE Technical Paper;2017-01-1835
Abstract: Clutches are commonly utilised in passenger type and off-road heavy-duty vehicles to disconnect the engine from the driveline and other parasitic loads. In off-road heavy-duty vehicles, along with fuel efficiency start-up functionality at extended ambient conditions, such as low temperature and intake absolute pressure are crucial. Off-road vehicle manufacturers can overcome the parasitic loads in these conditions by oversizing the engine. Caterpillar Inc. as the pioneer in off-road technology has developed a novel clutch design to allow for engine downsizing while vehicle’s performance is not affected. The tribological behaviour of the clutch will be crucial to start engagement promptly and reach the maximum clutch capacity in the shortest possible time and smoothest way in terms of dynamics. A multi-body dynamics model of the clutch system is developed in MSC ADAMS. The flywheel is introducing the same speed and torque as the engine (represents the engine input to the clutch). The hydraulic pressure is applied behind the piston to initiate the engagement. The angular motion of the plates is supported by friction torque between the plates and friction linings. The conjunctions between paper-based linings and steel plates are designed to be dry. Friction (the most significant tribological feature of the linings in torque transmission) is measured in a pin-on-disc tribometer and mapped into the dynamics model in MSC ADAMS. The pin-on-disc tribometer is able to capture the variation of friction coefficient with contact pressure and sliding velocity. The surface topography is obtained experimentally to examine the consistency of surface properties. The normal pressure and tribology of the contacting components determines the engagement time, clutch capacity and dynamic behaviour of the clutch.
Description: This paper is closed access until 5th November 2017.
Sponsor: The authors wish to express their gratitude to the Innovate UK for the financial support extended to (EBD3) Declutch program Grant (TSB reference: 102249), under which this research was carried out. Thanks are also due to the consortium of industrial partners of the EBD3 project, particularly to Turner Powertrain and Perkins Engines Co Ltd (Subsidiaries of Caterpillar) in this instance.
Version: Accepted for publication
DOI: 10.4271/2017-01-1835
URI: https://dspace.lboro.ac.uk/2134/25065
Publisher Link: https://doi.org/10.4271/2017-01-1835
ISSN: 0148-7191
Appears in Collections:Closed Access (Mechanical, Electrical and Manufacturing Engineering)

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