Experimental and Theoretical Study of Instantaneous Engine Valve Train Friction

[+] Author and Article Information
Riaz A. Mufti, Martin Priest

Institute of Tribology, School of Mechanical Engineering, The University of Leeds, Leeds, LS2 9JT, UK

J. Tribol 125(3), 628-637 (Jun 19, 2003) (10 pages) doi:10.1115/1.1538189 History: Received March 27, 2002; Revised September 05, 2002; Online June 19, 2003
Copyright © 2003 by ASME
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Camshaft Torque Measurement: (a) camshaft pulley torque transducer; and (b) female adapter for torque transducer calibration.
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Torque transducer calibration data
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Effect of belt tension on the torque transducers with zero applied torque
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Engine drive train layout
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Effect of digital filter (Butterworths) on raw data recorded at engine speed 2500 rpm ( – Filtered data, –Unfiltered data)
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Free body diagram of the cam follower arrangement 9
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(a), (b): Predicted minimum and central film thickness in the cam/follower interface and entraining velocity. (Oil temperature 80°C, engine speed 1500 rpm, SAE 0W/20 without friction modifier.)
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Experimental and predicted inlet camshaft friction torque averaged over the cam event only: (a) SAE 0W20 without friction modifier; and (b) SAE 0W20 with friction modifier.
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Instantaneous measured exhaust and inlet camshaft drive torque (– 800 rpm, [[dashed_line]]1500 rpm, [[dotted_line]] 2500 rpm)
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Experimental and predicted instantaneous coefficient of friction for the inlet camshaft. Oil temperature 60°C, 1500 rpm engine speed, SAE 0W20 without friction modifier
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Comparison of experimental and theoretical instantaneous inlet camshaft drive torque at oil temperature 40°C and 1500 engine rpm, SAE 0W20 with friction modifier
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Experimental instantaneous exhaust and inlet camshaft drive torque at 800, 1500, and 2500 rpm engine speed at temperatures of 95°C, 60°C and 40°C, SAE 0W20 without friction modifier (– 95°C, [[dashed_line]]60°C, [[dotted_line]] 40°C)



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