Dual drive for hydraulic pump and air boost compressor

• US 20060078445A1
• Filed: 01/31/2005
• Published: 04/13/2006
• Est. Priority Date: 02/05/2002
• Status: Abandoned Application

• Current Assignee: The Boeing Co.
• Original Assignee: Rolls-Royce PLC (Rolls-Royce Holdings Plc), The Boeing Co.
• Inventors: Carter, Howard III, Johnson, Richard N., Provost, Michael John, Brown, John David
• Application Number:
  US11/047,797
• Publication Number:
  US 20060078445A1
• Time in Patent Office: Days
• US Class Current: 417/423.600
• CPC Class Codes: B64D 41/00 Power installations for auxiliary purposes
• CPC Class Codes: F02C 7/32 Arrangement, mounting, or driving, of auxiliaries
• CPC Class Codes: F04D 25/02 Units comprising pumps and their driving means
• CPC Class Codes: F04D 25/06 the pump being electrically driven F04D25/08 takes precedence
• CPC Class Codes: Y02T 50/40 Weight reduction
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft
• CPC Class Codes: Y10T 74/19172 Reversal of direction of power flow changes power transmission to alternate path

Abstract

A dual drive system for a hydraulic pump and an air boost compressor is provided. Reversible power is transmitted to a shaft connected to clockwise and counterclockwise over-running clutches connected to different vehicle or equipment subsystems. Reversing the drive allows power to be alternately transmitted to one or the other of the subsystems. The invention includes utilizing the dual drive for hydraulic and air conditioning systems for an aircraft, with the provision of an additional drive motor providing constant power to one or more of the subsystems.

Claims

1. A dual drive system for providing power to two subsystems, the dual drive system comprising:

a reversible drive power source, having a main shaft with a longitudinal main shaft axis, a first end, and a second end;

a first over-running clutch assembly having a first output shaft, a first output speed, and having a free-wheeling rotational direction, the first over-running clutch assembly being connected to and driven by the first end of the main shaft;

a second over-running clutch assembly having a second output shaft, a second output speed, and an opposite free-wheeling rotational direction, the second over-running clutch assembly being connected to and driven by the second end of the main shaft;

a first subsystem, connected to and driven by the first output shaft; and

a second subsystem, connected to and driven by the second output shaft.

2. The system of claim 1, wherein the reversible drive power source is one of a multi-speed reversible electric motor, and a variable-speed reversible electric motor.

3. The system of claim 1, wherein the reversible drive power source indirectly drives the main shaft.

4. The system of claim 1, wherein the first over-running clutch assembly further comprises a gear system arranged to reduce or increase the first output speed.

5. The system of claim 4, wherein the gear system comprises a harmonic drive gear set.

6. The system of claim 1, wherein the second over-running clutch assembly further comprises a second gear system arranged to reduce or increase the second output speed.

7. The system of claim 1, wherein the first subsystem is a hydraulic pump.

8. The system of claim 1, wherein the second subsystem is an air compressor.

9. The system of claim 8, wherein the air compressor is an air cycle machine arranged for air-cooling.

10. The system of claim 1, further comprising:

a second drive power source, having a drive shaft with a longitudinal drive axis, arranged so that the drive shaft of the second drive power source is connected to and drives the second subsystem.

11. The system of claim 10, wherein the second drive power source is a single speed non-reversible electric motor.

12. The system of claim 10, wherein the longitudinal drive axis of the drive shaft of the second drive power source is aligned co-linear with the longitudinal main shaft axis of the main shaft of the reversible drive power source.

13-21. -21. (canceled)

22. A dual drive system for providing power to two aircraft subsystems, the dual drive system comprising:

a reversible drive power source incorporated in an aircraft, having a main shaft with a longitudinal main shaft axis, a first end, and a second end;

a first over-running clutch assembly having a first output shaft, a first output speed, and having a free-wheeling rotational direction, the first over-running clutch assembly being connected to and driven by the first end of the main shaft;

a second over-running clutch assembly having a second output shaft, a second output speed, and an opposite free-wheeling rotational direction, the second over-running clutch assembly being connected to and driven by the second end of the main shaft;

a hydraulic pump, connected to and driven by the first output shaft; and

an air compressor connected to and driven by the second output shaft.

23. The system of claim 22, wherein the reversible drive power source is one of a multi-speed reversible electric motor, and a variable-speed reversible electric motor.

24. The system of claim 22, wherein the first over-running clutch assembly further comprises a gear system arranged to reduce or increase the first output speed.

25. The system of claim 24, wherein the gear system comprises a harmonic drive gear set.

26. The system of claim 22, wherein the second over-running clutch assembly further comprises a second gear system arranged to reduce or increase the second output speed.

27. The system of claim 22, wherein the air compressor is an air cycle machine arranged for air-cooling.

28. The system of claim 27, further comprising:

a second drive power source, having a drive shaft with a longitudinal drive axis, arranged so that the drive shaft of the second drive power source is connected to and drives the air compressor.

29. The system of claim 28, wherein the second drive power source is a single speed non-reversible electric motor with its longitudinal drive axis aligned co-linear with the longitudinal main shaft axis of the main shaft of the reversible drive power source.

30-34. -34. (canceled)