IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0403970
(2003-03-31)
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발명자
/ 주소 |
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출원인 / 주소 |
- Honeywell International, Inc.
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대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
30 |
초록
▼
An improved stationary roller shaft of a gear assembly for an air turbine starter is provided. The air turbine starter may be used to start a gas turbine engine, such as may be found in aircraft, ships and military vehicles. The stationary roller shaft is formed of a material having a hardness of at
An improved stationary roller shaft of a gear assembly for an air turbine starter is provided. The air turbine starter may be used to start a gas turbine engine, such as may be found in aircraft, ships and military vehicles. The stationary roller shaft is formed of a material having a hardness of at least 66 Rockwell C and having a low inclusion content rating, thereby providing improved wear and/or fatigue properties.
대표청구항
▼
1. A method for fabricating a stationary roller shaft for a turbine starter, the method comprising:obtaining a predetermined material having a low inclusion content wherein the predetermined material consists essentially of in, weight percent, form 1.30% to 1.40% carbon, from 0.15% to 0.40% manganes
1. A method for fabricating a stationary roller shaft for a turbine starter, the method comprising:obtaining a predetermined material having a low inclusion content wherein the predetermined material consists essentially of in, weight percent, form 1.30% to 1.40% carbon, from 0.15% to 0.40% manganese, from 0.15% to 0.40% silicon, from 3.50% to 4.25% chromium, from 1.75% to 2.25% vanadium, from 5.75% to 6.75% tungsten, from 10.0% to 11.0% molybdenum, a maximum of approximately 0.04% sulfur, a maximum of approximately 0.03% phosphorous, a minimum of approximately 0.035% nitrogen, and the balance iron; machining the stationary roller shaft from the material such that the shaft is homogenous with respect to the predetermined material; and treating the stationary roller shaft to achieve a hardness of at least 66 Rockwell C. 2. The method of claim 1, wherein the material is a high speed steel.3. The method of claim 1, wherein the material consists essentially of, in weigh percent, 1.30% carbon, 0.35% manganese, 0.25% silicon, 3.75% chromium, 2.00% vanadium, 6.25% tungsten, 10.50% molybdenum, and 0.03% sulfur, a maximum of approximately 0.03% phosphorous, a minimum of approximately 0.035% nitrogen, and the balance iron.4. The method of claim 1, wherein the material comprises AISI M62.5. The method of claim 1, further comprising grinding the stationary roller shaft to a desired surface finish.6. The method of claim 5, wherein the grinding comprises grinding the stationary roller shaft to a surface finish no greater than 8 microinches rms.7. The method of claim 1, wherein the material is produced by a process including vacuum induction melting, atomization and hot isostatic compacting.8. The method of claim 1, wherein the treating comprises heating the stationary roller shaft to a temperature in the range of from about 500° C. to about 600° C.9. A method for fabricating a stationary roller shaft for an air turbine starter, the method comprising:obtaining a predetermined material produced by a process resulting in a low inclusion content of the material wherein the predetermined material consists essentially of, in weight percent, from 1.30% to 1.40% carbon, from 0.15% to 0.40% manganese, from 0.15% to 0.40% silicon, from 3.50% to 4.25% chromium, from 1.75% to 2.25% vanadium, from 5.75% to 6.75% tungsten, from 10.0% 11.0% molybdenum, a maximum of approximately 0.04% sulfur, a maximum of approximately 0.03% phosphorous, a maximum of approximately 0.035% nitrogen, and the balance iron; machining the stationary roller shaft from the material such that the roller shaft is homogenous with respect to the predetermined material; and treating the stationary roller shaft to achieve a hardness of at least 66 Rockwell C by heating the stationary roller shaft to a temperature in the range of from about 500° C. to about 600° C. 10. The method of claim 9, wherein the material is a high speed steel.11. The method of claim 9, wherein the material consists essentially of, in weigh percent, 1.30% carbon, 0.35% manganese, 0.25% silicon, 3.75% chromium, 2.00% vanadium, 6.25% tungsten, 10.50% molybdenum, and 0.03% sulfur, a maximum of approximately 0.03% phosphorous, a minimum of approximately 0.035% nitrogen, and the balance iron.12. The method of claim 9, wherein the material comprises AISI M62.13. The method of claim 9, further comprising grinding the stationary roller shaft to a desired surface finish.14. The method of claim 13, wherein the grinding comprises grinding the stationary roller shaft to a surface finish no greater than 8 microinches rms.15. The method of claim 9, wherein the material is produced by a process including vacuum induction melting, atomization and hot isostatic compacting.16. A method for fabricating a stationary roller shaft for an air turbine starter having a cavity of a predetermined size for accepting the roller shaft, the method comprising:obtaining a predetermined material produced by a process resulting in a low inclusion content of the material, wherein the predetermined material consists essentially of, in weight percent, from 1.30% to 1.40% carbon, from 0.15% to 0.40% manganese, from 0.15% to 0.40% silicon, from 3.50% to 4.25% chromium, from 1.75% to 2.25% vanadium, from 5.75% to 6.75% tungsten, from 10.0% to 11.0% molybdenum, a maximum of approximately 0.04% sulfur, a maximum of approximately 0.03% phosphorous, a minimum of approximately 0.035% nitrogen, and the balance iron; machining the stationary roller shaft from the material so it is of a size generally appropriate to fit in the cavity and such that the stationary roller shaft is homogenous with respect to the predetermined material; treating the stationary roller shaft to achieve to achieve a hardness of at least 66 Rockwell C by heating the stationary roller shaft to a temperature in the range of from about 500° C. to about 600° C.; and grinding the stationary roller shaft to a desired surface finish. 17. The method of claim 16, wherein the material consists essentially of, in weight percent, 1.30% carbon, 0.35% manganese, 0.25% silicon, 3.75% chromium, 2.00% vanadium, 6.25% tungsten, 10.50% molybdenum, and 0.03% sulfur, a maximum of approximately 0.03% phosphorous, a minimum of approximately 0.035% nitrogen, and the balance iron.
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