Method and apparatus for leak test
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United States of America Patent
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Mar 11, 1986
Grant Date -
N/A
app pub date -
Aug 29, 1983
filing date -
Aug 29, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To measure the leak rate in a transmission partially filled with a transmission fluid but having an air space of unknown volume, air is supplied to the transmission to pressurize the cavity to a preset value. The flow rate of air to the transmission is measured and that rate is integrated in a computer to determine the mass air flow which is proportional to the volume of the air space in the transmission. The decline of pressure in the air space as a result of fluid leakage from the transmission is monitored by the computer and the leak rate is determined on the basis of that rate and the derived volume of the air space.
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