Measuring and testing – Frictional resistance – coefficient or characteristics
Patent
1974-09-03
1976-04-06
Queisser, Richard C.
Measuring and testing
Frictional resistance, coefficient or characteristics
73146, G01N 1902, G01M 1702
Patent
active
039480801
ABSTRACT:
An apparatus is disclosed for testing the traction properties of pneumatic tires. A frame is provided having a plurality of structural members. A suspension system having upper and lower arms each having first and second ends is rotatably attached to the frame at the first ends of the upper and lower arms. A hub assembly having a triaxial force transducer mounted therein is attached to the second ends of the suspension system by means of a pair of spherical bearings. An aperture extending through a rear wall of the hub assembly, through the triaxial force transducer and through a front wall of the hub assembly supports a driven axle for applying driving or restraining torque to a pneumatic tire mounted on the front surface of the hub assembly. A pair of bearings which rotatably support the driven axle are respectively attached to first and second flanges of the triaxial force transducer to cancel the sensing of a force having components in the direction of tire travel and in the direction perpendicular to the road surface caused by a non-parallel orientation between the axis of rotation of the driving shaft and the axis of rotation of the pneumatic tire (the driven axle).
REFERENCES:
patent: 2496405 (1950-02-01), Foufounis
patent: 3301039 (1967-01-01), Kummer
Beauregard, C. and R. G. McNall, "Tire Cornering Traction Test Methods," SAE Paper No. 730,147, presented at SAE National Automotive Engineering Congress, Jan. 8-12, 1973.
Dugoff, H. and B. J. Brown, "Measurement of Tire Shear Forces," SAE Paper No. 700,092, presented at SAENAE Congress, Jan. 12-16, 1970.
Cortese, A. D. and C. S. Rockafellow, "General Motors Proving Ground Tire Cornering Test Vehicle," SAE Paper No. 710,092, presented at SAENAE Congress, Jan. 11-15, 1971.
Appleman John S.
Deeley, Jr. Harold P.
Farmer Herbert E.
Queisser Richard C.
The United States of America as represented by the Secretary of
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