Gear pump with improved gear/shaft retention
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United States of America Patent
Stats
-
May 31, 1994
Grant Date -
N/A
app pub date -
May 11, 1993
filing date -
May 11, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A gear pump in which a gear is secured to a shaft by a press fit and by a key which fits into a slot in the shaft. The key includes radially projecting ears which fit into keyways in the bore of the gear, the keyways having bottoms facing axially toward the bottom of the slot. A hot upset at the free end of the shaft clamps the key axially between the bottom of the slot and the bottom of the keyways. When the shaft/gear/key subassembly is assembled with the body and the end plate of the pump, the gear retention elements described above coact to positively prevent the shaft from being pulled out of the body and from being thrust inwardly into contact with the end plate.
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