Numerical and Physical Experiments on Drag Torque in a Wet Clutch

The effect of flow field on drag torque in a wet clutch was examined through numerical and physical experiments. Three-dimensional hydrodynamic numerical simulations were carried out, and the drag torque was measured experimentally for a single wet clutch pack. Two-phase flow induced by aeration was...

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Autores principales:	Youhei Takagi, Yasunori Okano, Masatoshi Miyayaga, Nobuyuki Katayama
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2012
Materias:	wet clutch drag torque aeration visualization numerical simulation Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/b9af928312d74bf39e7bfc3db3295edc
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id	oai:doaj.org-article:b9af928312d74bf39e7bfc3db3295edc
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spelling	oai:doaj.org-article:b9af928312d74bf39e7bfc3db3295edc2021-11-05T09:24:50ZNumerical and Physical Experiments on Drag Torque in a Wet Clutch1881-219810.2474/trol.7.242https://doaj.org/article/b9af928312d74bf39e7bfc3db3295edc2012-11-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/7/4/7_242/_pdf/-char/enhttps://doaj.org/toc/1881-2198The effect of flow field on drag torque in a wet clutch was examined through numerical and physical experiments. Three-dimensional hydrodynamic numerical simulations were carried out, and the drag torque was measured experimentally for a single wet clutch pack. Two-phase flow induced by aeration was visualized in the experiment. The wet clutch consists of two parallel circular plates. The plate with one side covered with the frictional material was rotated. The radial or circumferential grooves were made on the rotating disk by dividing the frictional material. The lubrication oil was supplied from the axial center, and ejected into the surrounding open boundary. At low rotation speeds, the oil flow was of single-phase, and the drag torque was linearly proportional to the rotation speed since the wall shear stress increased monotonically. In the single-flow regime, the slope of drag torque curve was controlled with the clearance between the clutch plates. The drag torque reached a peak value at a certain rotation speed, and it decreased gradually after the peak because of aeration. The peak of drag torque was controlled by both the flow rate of supplied oil and the arrangement of grooves on the frictional material. It also was found that the smooth ejection of oil and the enhancement of aeration led to the drag torque reduction.Youhei TakagiYasunori OkanoMasatoshi MiyayagaNobuyuki KatayamaJapanese Society of Tribologistsarticlewet clutchdrag torqueaerationvisualizationnumerical simulationPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 7, Iss 4, Pp 242-248 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	wet clutch drag torque aeration visualization numerical simulation Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	wet clutch drag torque aeration visualization numerical simulation Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Youhei Takagi Yasunori Okano Masatoshi Miyayaga Nobuyuki Katayama Numerical and Physical Experiments on Drag Torque in a Wet Clutch
description	The effect of flow field on drag torque in a wet clutch was examined through numerical and physical experiments. Three-dimensional hydrodynamic numerical simulations were carried out, and the drag torque was measured experimentally for a single wet clutch pack. Two-phase flow induced by aeration was visualized in the experiment. The wet clutch consists of two parallel circular plates. The plate with one side covered with the frictional material was rotated. The radial or circumferential grooves were made on the rotating disk by dividing the frictional material. The lubrication oil was supplied from the axial center, and ejected into the surrounding open boundary. At low rotation speeds, the oil flow was of single-phase, and the drag torque was linearly proportional to the rotation speed since the wall shear stress increased monotonically. In the single-flow regime, the slope of drag torque curve was controlled with the clearance between the clutch plates. The drag torque reached a peak value at a certain rotation speed, and it decreased gradually after the peak because of aeration. The peak of drag torque was controlled by both the flow rate of supplied oil and the arrangement of grooves on the frictional material. It also was found that the smooth ejection of oil and the enhancement of aeration led to the drag torque reduction.
format	article
author	Youhei Takagi Yasunori Okano Masatoshi Miyayaga Nobuyuki Katayama
author_facet	Youhei Takagi Yasunori Okano Masatoshi Miyayaga Nobuyuki Katayama
author_sort	Youhei Takagi
title	Numerical and Physical Experiments on Drag Torque in a Wet Clutch
title_short	Numerical and Physical Experiments on Drag Torque in a Wet Clutch
title_full	Numerical and Physical Experiments on Drag Torque in a Wet Clutch
title_fullStr	Numerical and Physical Experiments on Drag Torque in a Wet Clutch
title_full_unstemmed	Numerical and Physical Experiments on Drag Torque in a Wet Clutch
title_sort	numerical and physical experiments on drag torque in a wet clutch
publisher	Japanese Society of Tribologists
publishDate	2012
url	https://doaj.org/article/b9af928312d74bf39e7bfc3db3295edc
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Numerical and Physical Experiments on Drag Torque in a Wet Clutch

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