US3644067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power transmission
Assignee: Vickers Inc
•
Filing: 1970-05-25
•
Granted: 1972-02-22
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Expires: 1990-05-25
Abstract
Abstract An electric motor-pump unit utilizes a hollow drive shaft supporting the motor rotor and the pump impeller. A sleeve within the hollow shaft forms a reentrant passage for conducting a portion of the pumped fluid into heat conducting relation with the motor rotor for cooling purposes. The unit is especially adapted for driving and supercharging high-pressure hydraulic pumps in aircraft.
Inventors
- 👤 Gordon H Yowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:07
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/04; F04D29/046; F04D29/049; F04D13/00; F04D13/02; F04D13/06; F04D29/58; F04D29/586; F04D29/588; H; H02; H02K; H02K5/00; H02K5/04; H02K5/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
125 words
An electric motor and pump unit comprising a motor having a stator and a rotor, a hollow drive shaft carrying the rotor in heat conducting relation thereto, a centrifugal pump having a stator and an impeller carried by the motor stator and the drive shaft respectively, inlet and outlet passages for the pump, means forming a reentrant fluid passage within the drive shaft in heat conducting relation to the motor rotor, passages connecting the opposite ends of the reentrant passage with the intake and delivery sides of the impeller, whereby a portion of the fluid delivered by the pump is bypassed through the shaft for cooling purposes, an open ball bearing journaling the drive shaft, and means for directing bypassed fluid through the ball bearing.
Claim 2
Dependent Claim
125 words
An electric motor and pump unit comprising a motor having a stator and a rotor, a hollow drive shaft carrying the rotor in heat conducting relation thereto, a centrifugal pump having a stator and an impeller carried by the motor stator and the drive shaft respectively, inlet and outlet passages for the pump, means forming a reentrant fluid passage within the drive shaft in heat conducting relation to the motor rotor, passages connecting the opposite ends of the reentrant passage with the intake and delivery sides of the impeller, whereby a portion of the fluid delivered by the pump is bypassed through the shaft for cooling purposes, an open ball bearing journaling the drive shaft, and means for directing bypassed fluid through the ball bearing.
Claim 3
Dependent Claim
25 words
A unit as defined in claim 1 including a shaft seal inboard of the ball bearing and exposed to fluid flowing through the ball bearing.
References Cited (Backward Citations)
US2194054A
Cited
US3267868A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |