SAE J1561:2019 pdf free
SAE J1561:2019 pdf free.Laboratory Speed Test Procedure for Passenger Car Tires
Ambient Temperature – This is the temperature of the air measured during a high-speed test at a fixed location near the tire. The fixed location of ambient temperature measurement is defined as a point on the rotational axis of the tire, 0.31 m (12 in) from the plane touching the nearest tire sidewall (or at a point where an equivalent temperature exists).
Thermal Conditioning一Condition the tire/wheel assembly at test room temperature for not less than 3 h.Readjust the inflation pressure to that specified in 5.2.
Operation (1.708 m Diameter Standard Test Wheel)- The tire and wheel assembly shall be mounted on the test axle and pressed normal to the outer face of the test wheel with the test load. Carry the test through without interruption, as follows:
a. Time taken to pass from zero speed to the initial test speed一10 min
b. Initial test speed is the speed category of the tire less 40 km/h (24 mph). For tires which do not have a speed category, the initial test speed shall be 1 10 km/h (68 mph).
c. Duration at initial test speed 一10 min
d. Successive speed increments一10 km/h (6 mph)
e. Duration at each speed step一10 min
f. Duration at the speed cateaorv step__ 10 min
ALTERNATE OPERATION (2.0 m DIAMETER OP TIONAL TEST WHEEL) -This operation is the same as 6.2 except:
a. Initial test speed is the speed category of the tire less 30 km/h (18 mph). For tires which do not have a speed category, the initial test speed shall be 120 km/h (75 mph).
b. Duration at the speed category step一20 min
Marginal Indicia – The change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions have been made to the previous issue of the report. An (R) symbol to the left of the document title indicates a complete revision of the report.SAE J1561 pdf free download.
