POWER TRANSMISSION
First Claim
1. 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.
2 Assignments
0 Petitions
Accused Products
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.
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Citations
2 Claims
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1. 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.
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2. 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.
Specification
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- Resources
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Current AssigneeVickers Incorporated (Eaton Corporation PLC.)
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Original AssigneeGordon H. Yowell
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InventorsYowell, Gordon H.
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Primary Examiner(s)Walker, Robert M.
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Application NumberUS05/040,176Time in Patent Office638 DaysField of Search417/357,247,369,370,371,372,423,424,901US Class Current417/370CPC Class CodesF04D 13/06 the pump being electrically...F04D 29/049 Roller bearingsF04D 29/588 cooling or heating the mach...H02K 5/12 specially adapted for opera...
