Measuring and testing – Frictional resistance – coefficient or characteristics
Patent
1985-12-16
1987-05-05
Levy, Stewart J.
Measuring and testing
Frictional resistance, coefficient or characteristics
G01N 1902
Patent
active
046622110
ABSTRACT:
Apparatus for measuring friction characteristics of a vehicle-travelled surface comprising a wheeled vehicle having a test wheel assembly pivotally suspended therefrom by a parallelogram suspension arrangement. The test wheel assembly includes a test wheel carried by a drive shaft which is driven at predetermined slip by a differential coupled to the vehicle wheels. A gear chain extends from the differential to the drive shaft through a housing which forms one arm of the suspension. The second arm is formed by a rod which extends from the differential to one section of a two-axis strain gage wheel force transducer at the test wheel assembly. The differential is suspended by parallel struts from the vehicle frame. A positive displacement pump is coupled to the differential for placing a film of water beneath the test wheel having a thickness which is independent of vehicle speed. The pump and test wheel are clutch driven.
REFERENCES:
patent: 3893330 (1975-07-01), Shute et al.
patent: 3948080 (1976-04-01), Boyd
patent: 4098111 (1978-07-01), Hardmark et al.
patent: 4212063 (1980-07-01), Hardmark
K. J. Law Engineers, Inc.
Levy Stewart J.
Raevis Robert R.
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