Gear pump with improved shaft seal
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United States of America Patent
Stats
-
Oct 6, 1981
Issued Date -
N/A
app pub date -
Aug 1, 1979
filing date -
Dec 19, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A gear pump for pumping hydraulic fluid includes housing, a pair of gears mounted for rotation within the housing, and a drive shaft affixed to one of the gears for transmitting a rotational input force to that gear. The drive shaft includes a portion extending outwardly beyond the housing. A bushing is provided surrounding the drive shaft and secured to the housing so that the drive shaft is free to rotate within the bushing. The bushing is positioned along the drive shaft between the driven gear and the portion of the drive shaft that extends beyond the housing. The bushing includes an end surface facing the driven gear and an annular recess in the end surface adjacent the drive shaft. A dynamic sealing member is positioned within the annular recess for minimizing the amount of leakage of the pumped fluid along the drive shaft.
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