Gear pump with improved gear/shaft retention

Details Gear pump with improved gear/shaft retention Gear pump with improved gear/shaft retention

1993-05-11

1994-05-31

Bertsch, Richard A.

Rotary expansible chamber devices

Moving cylinder

Rotating

418166, 403355, 403358, F04C 200

Patent

active

053164571

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.

REFERENCES:
patent: 3619089 (1971-11-01), Pierrat
patent: 4171939 (1979-10-01), Harwath
patent: 4391580 (1983-07-01), Hunsberger et al.
patent: 4432712 (1984-02-01), Eienmann
patent: 4685871 (1987-08-01), Harwath
patent: 4728271 (1988-03-01), Harwath
patent: 4958997 (1990-09-01), Harwath

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