[특허]Roller Traction Drive System for an Aircraft Drive Wheel Drive System

Cox, Isaiah W.

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Roller Traction Drive System for an Aircraft Drive Wheel Drive System

특허상세정보
국가/구분	United States(US) Patent 공개
국제특허분류(IPC7판)	B64C-025/40
출원번호	US-0531359 (2014-11-03)
공개번호	US-0122008 (2016-05-05)
발명자 / 주소	Cox, Isaiah W. Perkins, Scott Stoltze, David
출원인 / 주소	Cox, Isaiah W.
인용정보	피인용 횟수 : 0 인용 특허 : 0

초록
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A roller traction drive system integral with a non-engine drive means and a clutch assembly in an aircraft drive wheel drive system capable of moving an aircraft autonomously on the ground is provided. The roller traction drive system is selectively activated by the clutch assembly into and out of actuating contact with the non-engine drive means to drive the aircraft drive wheel. Roller traction drive system components are made of materials designed to enable dry running and operation at the torques, drive means speeds, and reduction ratios required to actuate a drive means and drive a drive wheel for autonomous aircraft ground movement. Roller traction drive materials may be selected to maintain effective torque transfer between roller traction drive system components and the non-engine drive means as well as to minimize undesirable thermal expansion.

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1. A roller traction drive system operatively integral with an aircraft drive wheel drive system designed to efficiently move an aircraft autonomously during ground operations comprising: a. at least one drive wheel rotatably mounted on an aircraft nose or main landing gear to move an aircraft autonomously during ground travel without reliance on aircraft engines or external vehicles; andb. a drive wheel drive system mounted completely within and operably connected to said drive wheel to control rotation of said drive wheel, wherein said drive wheel drive system comprises non-engine drive means in driving contact with said drive wheel to power rotation of said drive wheel at a desired speed and torque, a roller traction drive system in actuating contact with said non-engine drive means, and a clutch assembly controllable to selectively engage and disengage said roller traction drive system into and out of said actuating contact with said non-engine drive means, wherein said roller traction drive system comprises a plurality of rollers in rolling traction force contact between spaced circumferential races, and wherein each of said rollers and said races is formed of a material selected to establish and maintain effective torque transfer between said rollers and said races and with said non-engine drive means. 2. The drive system of claim 1, wherein said roller traction drive system further comprises a roller box housing said rollers and races operably interposed in torque transfer relationship between said clutch assembly and said non-engine drive means. 3. The drive system of claim 1, wherein said races comprise an inner circumferential race and an outer circumferential race spaced outwardly of said inner circumferential race, and said plurality of rollers comprises a circumferential row of inner rollers in contact with said inner race and a circumferential row of outer rollers in contact with said inner rollers and said outer circumferential race. 4. The drive system of claim 3, wherein said inner race and said outer rollers are made of a first material and said inner rollers and said outer race are made of a second material different from said first material. 5. The drive system of claim 4, wherein said first material comprises beryllium copper and said second material comprises a steel alloy. 6. The drive system of claim 4, wherein said first material comprises steel and said second material comprises beryllium copper. 7. The drive system of claim 4, wherein said first material comprises a spinodal bronze alloy and said second material comprises steel. 8. The drive system of claim 4, wherein said first material comprises steel and said second material comprises a spinodal bronze alloy. 9. The drive system of claim 1, wherein each of said rollers and said races are formed from a material selected from the group comprising titanium, steel alloys, beryllium copper, and spinodal bronze alloys. 10. The drive system of claim 1, wherein said non-engine drive means comprises an electric, pneumatic, or hydraulic motor. 11. The drive system of claim 10, wherein said non-engine drive means comprises a high phase order electric motor in actuating contact with said roller traction drive system. 12. The drive system of claim 2, wherein said roller box comprises a drive means support adapted to provide a bearing connection between said non-engine drive means and said roller traction drive system. 13. The drive system of claim 1, wherein said rollers comprise hollow cylindrical structures. 14. The drive system of claim 1, wherein said rollers are sized and positioned between said races to produce a desired torque and frictional contact between said rollers and between said rollers and said races when said roller fraction drive system is engaged to actuate said non-engine drive means. 15. The drive system of claim 14, wherein said plurality of rollers comprises a circumferential array of outboard rollers located near an outboard edge of said roller traction drive system and a circumferential array of inboard rollers located near an inboard edge of said roller fraction drive system. 16. The drive system of claim 15, wherein each of said outboard and said inboard array of rollers comprises a double row of rollers comprising an inner row and an outer row; positioned to maintain a desired optimum fraction angle and formed of a material selected to establish and maintain effective torque transfer contact during operation of said drive wheel drive system to move an aircraft autonomously on the ground. 17. The system of claim 16, wherein said races and said rollers are made of materials selected from the group comprising titanium, steel alloys, beryllium copper, and spinodal bronze alloys, wherein materials forming said races or said rollers are selected to produce a desired coefficient of friction when said rollers are positioned to maintain said desired traction angle, thereby self-energizing said roller fraction drive system. 18. A roller traction drive system actuatable to transfer torque to a non-engine drive motor activatable by said roller traction drive system to move a nose or main landing gear wheel to drive an aircraft autonomously during ground operations, wherein said roller traction drive system comprises at least an inner array of cylindrical rollers in contact with an outer array of cylindrical rollers, said inner array being in further contact with an inner race and said outer array being in further contact with an outer race, wherein said rollers and said races are made of materials selected to produce a desired coefficient of friction when said rollers are positioned to maintain a desired optimum traction angle during actuation of said roller drive system, and wherein said roller traction drive system is located in torque transfer and activating contact with said non-engine drive motor within said nose or main landing gear wheel. 19. The roller traction drive system of claim 18, wherein said materials are selected to have a desired coefficient of friction and are selected from the group comprising titanium, steel alloys, beryllium copper, and spinodal bronze alloys. 20. The roller traction drive system of claim 19, wherein said materials are further selected to dissipate heat from said roller traction drive system. 21. A roller fraction drive system operatively integral with an aircraft drive wheel drive system designed to efficiently move an aircraft autonomously during ground operations without reliance on aircraft engines or external tow vehicles comprising: a. a roller traction drive system within a wheel drive system mounted completely within a drive system housing completely within at least one wheel rotatably mounted on an aircraft landing gear axle and operatively connected to said wheel to control rotation of said wheel to drive the aircraft during ground operations; andb. said roller fraction drive system is positioned within said drive system housing in actuating and torque transfer between a drive motor and a clutch assembly controllable to selectively engage or disengage said roller fraction drive system into and out of torque transfer contact with said drive motor. 22. The system of claim 21, wherein said at least one wheel comprises an inboard wall section connected to an outboard wall section to define an maximum interior space within said wheel between said landing gear axle and a tire mounted on said wheel and said drive system housing has an outboard section configured to be parallel to said wheel outboard wall section, an angled inboard section spaced from said wheel inboard wall section to define an inboard recess within said interior space, and a central circumferential section disposed between said outboard section and said inboard section. 23. The system of claim 22, wherein an outboard extent of said drive motor is aligned with an outboard edge of said roller fraction drive system so that said outboard extent and said outboard edge are in parallel alignment with said wheel outboard section. 24. The system of claim 22, wherein said drive system housing further comprises support means for providing a bearing connection between said drive motor and said roller traction drive system. 25. The system of claim 21, wherein said roller fraction drive system comprises a roller drive housing supporting a plurality of hollow cylindrical rollers in rolling traction force contact with spaced circumferential races. 26. The system of claim 25, wherein said rollers are sized and positioned between said races to produce a desired torque and frictional contact between said rollers and between said rollers and said races when said roller traction drive means is engaged by said clutch assembly to actuate said drive motor. 27. The system of claim 25, wherein said rollers and said races are positioned within said roller drive housing so that said plurality of rollers comprises a circumferential array of outboard rollers located near an outboard edge of said roller drive housing and a circumferential array of inboard rollers located near an inboard edge of said roller drive housing. 28. The system of claim 27, wherein each of said circumferential array of outboard and said circumferential array of inboard rollers comprises a double row of rollers comprising an inner row and an outer row located in positions between said races to maintain a desired optimum traction angle and to energize said roller traction drive system. 29. The system of claim 28, wherein said races and said rollers are made of a material selected to produce a desired coefficient of friction when said rollers are positioned between said races to maintain said desired traction angle. 30. The system of claim 28, wherein said roller drive housing comprises a motive surface in torque transfer contact with said clutch assembly and an opposed motive surface in torque transfer contact with said drive motor. 31. The system of claim 28, wherein said rollers comprise self-alignment means for maintaining a desired rolling force contact between said rollers. 32. The system of claim 22, wherein said clutch assembly is positioned to be in selectively engaging contact with said roller traction drive system and said wheel comprises a clutch recess located in a wheel inboard wall section adjacent to said inboard section of said drive system housing to receive said clutch assembly when said clutch assembly is out of engaging contact with said roller traction drive system.

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Roller Traction Drive System for an Aircraft Drive Wheel Drive System

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