IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0839437
(2010-07-20)
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등록번호 |
US-8485936
(2013-07-16)
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발명자
/ 주소 |
- Makulec, Jeffrey M.
- Slayter, Matthew
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출원인 / 주소 |
- Hamilton Sundstrand Corporation
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대리인 / 주소 |
Carlson, Gaskey & Olds, PC
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인용정보 |
피인용 횟수 :
6 인용 특허 :
13 |
초록
▼
A planet shaft for supporting a planet gear has a supporting portion extending along a central axis and having a first outer diameter. A flange is formed at one end of the supporting portion, which has a smaller section formed about a portion of a circumference around the central axis, and an enlarg
A planet shaft for supporting a planet gear has a supporting portion extending along a central axis and having a first outer diameter. A flange is formed at one end of the supporting portion, which has a smaller section formed about a portion of a circumference around the central axis, and an enlarged portion extending away from the central axis for a greater distance than the smaller portion. A hole to receive a lock member is formed in the enlarged portion. A planetary gear assembly including such a planet shaft is disclosed as is an air turbine starter including the planetary gear system. Further, a method of installing a planet gear and planet shaft is also disclosed and claimed.
대표청구항
▼
1. A planet shaft for supporting a planet gear comprising: a supporting portion extending along a central axis;a flange formed at one end of said supporting portion, said flange having a smaller section formed about a portion of a circumference around said central axis, and an enlarged portion, said
1. A planet shaft for supporting a planet gear comprising: a supporting portion extending along a central axis;a flange formed at one end of said supporting portion, said flange having a smaller section formed about a portion of a circumference around said central axis, and an enlarged portion, said enlarged portion extending away from said central axis for a greater distance than said smaller portion, a hole to receive a lock member being formed in the enlarged portion; andsaid smaller portion is a part-circular portion having an outer periphery at a first radius. 2. The planet shaft as set forth in claim 1, wherein said enlarged portion extends generally along a pair of angled sides away from said part-circular portion, and an angle defined between said angled sides is between 40° and 60°. 3. The planetary shaft as set forth in claim 1, wherein said enlarged portion ensuring a correct rotational orientation of the planet shaft when mounted to a fixed housing. 4. The planet shaft as set forth in claim 1, wherein said hole in said enlarged portion is centered on a hole axis spaced by said central axis by a second distance, a ratio of said second distance to said first radius is between 1.2 and 1.6. 5. The planet shaft as set forth in claim 4, wherein a ratio of said second distance to an outer diameter of said supporting portion is between 1.1 and 1.5. 6. A planetary gear assembly comprising: a sun gear;a plurality of planet gears driven by said sun gear;said plurality of planet gears engaged to drive a ring gear;a fixed housing for supporting said planet gears;said planet gears including a bearing within an inner peripheral bore in said planet gears, and a planet shaft in each said planet gear supported within said bearing, said planet shaft including a supporting portion extending along a central axis;a flange formed at one end of said supporting portion, said flange having a smaller section formed about a portion of a circumference around said central axis, and an enlarged portion, said enlarged portion extending away from said central axis for a greater distance than said smaller portion; anda hole formed in each said enlarged portion, and a lock member extending through each said hole and into said housing. 7. The planetary gear assembly as set forth in claim 6, wherein said enlarged portion ensuring a correct rotational orientation of the planet shaft as fixed to said fixed housing. 8. The planetary gear assembly as set forth in claim 6, wherein said smaller portion is a part-circular portion having an outer periphery at a first radius. 9. The planetary gear assembly as set forth in claim 8, wherein said hole in said enlarged portion is centered on a hole axis spaced by said central axis by a second distance, a ratio of said second distance to said first radius is between 1.2 and 1.6. 10. The planetary gear assembly as set forth in claim 9, wherein a ratio of said second distance to an outer diameter of said supporting portion is between 1.1 and 1.5. 11. The planetary gear assembly as set forth in claim 8, wherein said enlarged portion extends generally along a pair of angled sides away from said part-circular portion, and an angle defined between said angled sides is between 40° and 60°. 12. The planetary gear assembly as set forth in claim 8, wherein said housing includes a plurality of enlarged portions having a part-circular portion, and an enlarged portion which sit in support of said flange, and with portions of an outer housing face remote from said part-circular portion and said enlarged portion being further axially removed from said flange. 13. An air turbine starter comprising: an air inlet for directing air across a turbine rotor, said turbine rotor being driven to rotate by the air, and drive a turbine shaft, said turbine shaft driving a planetary gear system by driving a sun gear;a plurality of planet gears driven by said sun gear;said plurality of planet gears engaged to drive ring gear;a fixed housing for supporting said planet gears;said planet gears including a bearing within an inner peripheral bore in said planet gears, and a planet shaft in each said planet gear supported within said bearing, said planet shaft including a supporting portion extending along a central axis;a flange formed at one end of said supporting portion, said flange having a smaller section formed about a portion of a circumference around said central axis, and an enlarged portion, said enlarged portion extending away from said central axis for a greater distance than said smaller portion; anda hole formed in each said enlarged portion, and a lock member extending through each said hole and into said housing. 14. The air turbine starter as set forth in claim 13, wherein said enlarged portion ensuring a correct rotational orientation of the planet shaft as fixed to said fixed housing. 15. The air turbine starter as set forth in claim 13, wherein said smaller portion is a part-circular portion having an outer periphery at a first radius. 16. The air turbine starter as set forth in claim 15, wherein said hole in said enlarged portion is centered on a hole axis spaced by said central axis by a second distance, and a ratio of said second distance to said first radius is between 1.2 and 1.6. 17. The air turbine starter as set forth in claim 16, wherein a ratio of said second distance to an outer diameter of said supporting portion is between 1.1 and 1.5. 18. The air turbine starter as set forth in claim wherein said enlarged portion extends generally along a pair of angled sides away from said part-circular portion, and an angle defined between said angled sides is between 17° and 60°. 19. The air turbine starter as set forth in claim 15, wherein said housing includes a plurality of enlarged portions having a part-circular portion, and an enlarged portion which sit in support of said flange, and with portions of an outer housing face remote from said part-circular portion and said enlarged portion being further axially removed from said flange. 20. A method of installing a planet shaft for a planet gear comprising the steps of: (a) providing a planet shaft, and mounting bearings on an outer periphery of a support portion of said planet shaft, said planet shaft being mounted in a fixed housing, with said support portion extending into an interior bore in said housing, and a flange of said planet shaft being positioned on an opposed outer face of said outer housing; and(b) aligning a hole in an enlarged portion of said flange with a hole in said housing, and inserting a lock member through said hole and into said housing to lock said planet shaft. 21. The method as set forth in claim 20, wherein said alignment step (b) includes providing an enlarged surface on the outer face of said housing, with other portions of said outer face remove from said enlarged portion being spaced further away from said flange. 22. The method as set forth in claim 20, wherein the lock member is a threaded bolt which is threaded into a threaded hole in said housing. 23. The method as set forth in claim 20, wherein said enlarged portion ensuring a correct rotational orientation of the planet shaft as fixed to said fixed housing.
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