Tribodynamics of a new declutch mechanism aimed for engine downsizing in off-road heavy-duty vehicles

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 inta...

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Main Authors:	Nader Dolatabadi, Ramin Rahmani, Stephanos Theodossiades, Homer Rahnejat, Guy Blundell, Guillaume Bernard
Format:	Default Article
Published:	2017
Subjects:	Mechanical engineering not elsewhere classified Off-road heavy-duty vehicle Clutch disconnect Dynamics Tribology Mechanical Engineering not elsewhere classified
Online Access:	https://hdl.handle.net/2134/25065
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id	rr-article-9577103
record_format	Figshare
spelling	rr-article-95771032017-06-05T00:00:00Z Tribodynamics of a new declutch mechanism aimed for engine downsizing in off-road heavy-duty vehicles Nader Dolatabadi (1259523) Ramin Rahmani (1250418) Stephanos Theodossiades (1247457) Homer Rahnejat (1247550) Guy Blundell (7214297) Guillaume Bernard (2626852) Mechanical engineering not elsewhere classified Off-road heavy-duty vehicle Clutch disconnect Dynamics Tribology Mechanical Engineering not elsewhere classified 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. 2017-06-05T00:00:00Z Text Journal contribution 2134/25065 https://figshare.com/articles/journal_contribution/Tribodynamics_of_a_new_declutch_mechanism_aimed_for_engine_downsizing_in_off-road_heavy-duty_vehicles/9577103 CC BY-NC-ND 4.0
institution	Loughborough University
collection	Figshare
topic	Mechanical engineering not elsewhere classified Off-road heavy-duty vehicle Clutch disconnect Dynamics Tribology Mechanical Engineering not elsewhere classified
spellingShingle	Mechanical engineering not elsewhere classified Off-road heavy-duty vehicle Clutch disconnect Dynamics Tribology Mechanical Engineering not elsewhere classified Nader Dolatabadi Ramin Rahmani Stephanos Theodossiades Homer Rahnejat Guy Blundell Guillaume Bernard Tribodynamics of a new declutch mechanism aimed for engine downsizing in off-road heavy-duty vehicles
description	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.
format	Default Article
author	Nader Dolatabadi Ramin Rahmani Stephanos Theodossiades Homer Rahnejat Guy Blundell Guillaume Bernard
author_facet	Nader Dolatabadi Ramin Rahmani Stephanos Theodossiades Homer Rahnejat Guy Blundell Guillaume Bernard
author_sort	Nader Dolatabadi (1259523)
title	Tribodynamics of a new declutch mechanism aimed for engine downsizing in off-road heavy-duty vehicles
title_short	Tribodynamics of a new declutch mechanism aimed for engine downsizing in off-road heavy-duty vehicles
title_full	Tribodynamics of a new declutch mechanism aimed for engine downsizing in off-road heavy-duty vehicles
title_fullStr	Tribodynamics of a new declutch mechanism aimed for engine downsizing in off-road heavy-duty vehicles
title_full_unstemmed	Tribodynamics of a new declutch mechanism aimed for engine downsizing in off-road heavy-duty vehicles
title_sort	tribodynamics of a new declutch mechanism aimed for engine downsizing in off-road heavy-duty vehicles
publishDate	2017
url	https://hdl.handle.net/2134/25065
_version_	1797373615336849408

Tribodynamics of a new declutch mechanism aimed for engine downsizing in off-road heavy-duty vehicles

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