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Standard Test Method for Low Temperature Viscosity of Drive Line Lubricants in a Constant Shear Stress Viscometer
Automaticky přeložený název:
Standardní zkušební metoda pro nízkoteplotní Viskozita Pohon maziv v konstantní smykové napětí viskozimetru
NORMA vydána dne 1.7.2014
Označení normy: ASTM D6821-14
Poznámka: NEPLATNÁ
Datum vydání normy: 1.7.2014
Kód zboží: NS-36663
Počet stran: 7
Přibližná hmotnost: 21 g (0.05 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
apparent viscosity, low-temperature flow properties, low-temperature viscosity, mini-rotary viscometer, viscosity, yield stress, ICS Number Code 75.100 (Lubricants, industrial oils and related products)
Significance and Use | ||||||||||||||||||||||||||
5.1 Viscosity of drive line lubricants at low temperature is critical for both gear lubrication and the circulation of the fluid in automatic transmissions. For gear oils (GOs), the issue is whether the fluid characteristics are such that the oil will flow into the channel dug out by the submerged gears as they begin rotating and re-lubricating them as they continue to rotate. For automatic transmission fluids, torque, and tractor fluids the issue is whether the fluid will flow into a pump and through the distribution system rapidly enough for the device to function. 5.2 The low temperature performance of drive line lubricant flow characteristics was originally evaluated by the channel test. In this test, a pan was filled to a specified depth of approximately 2.5 cm and then cooled to test temperature. The test was performed by scraping a channel through the full depth of the fluid and across the length of the pan after it had soaked at test temperature for a specified time. The time it took the fluid to cover the channel was measured and reported. The channel test was replaced by Test Method D2983 in 1971. 5.3 The results of this test procedure
correlate with the viscometric measurements obtained in Test Method
D2983.4
The correlation obtained is:
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