Trim ring gear for integrated drive generator
First Claim
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1. A trim ring gear for use in an integrated drive generator comprising:
- a ring gear body extending between a first end and a second end, and having an inner bore and an outer peripheral surface, a plurality of outer gear teeth on said outer peripheral surface and a plurality of inner gear teeth on an inner surface of said inner bore;
wherein said outer gear teeth have a profile defined by roll angles and wherein a first of said outer tooth roll angles is between 16.0 and 17.5°
, a second of said outer tooth roll angles is between 17.5 and 19.0°
, a third of said outer tooth roll angles is between 22.0 and 23.5°
, and a fourth of said outer tooth roll angles is between 23.0 and 24.5°
;
said inner gear teeth having a profile defined by inner tooth roll angles, with a first of said inner tooth roll angles being between 31.5 and 33.0°
, a second of said inner tooth roll angles being between 30.0 and 31.5°
, a third of said inner tooth roll angles being between 25.5 and 27.0°
, and a fourth of said inner tooth roll angles being between 24.0 and 25.5°
; and
wherein said inner gear teeth are within a radially smaller portion of said ring gear body and said inner gear teeth being at an axially intermediate location spaced towards said second end from a radially enlarged portion carrying said outer gear teeth.
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Abstract
A trim ring gear for use in an integrated drive generator has a ring gear body extending between a first end and a second end. Outer gear teeth are formed on an outer surface, and inner gear teeth are formed on an inner surface. The outer tooth roll angle at A is between 16.0 and 17.5°, at B is between 17.5 and 190°, at C is between 22.0 and 23.5°, and at D is between 23.0 and 24.5°. The inner tooth roll angle at A is between 31.5 and 33.0°, at B is between 30.0 and 31.5°, at C is between 25.5 and 27.0°, and at D is between 24.0 and 25.5°. An integrated drive generator, and a method of replacing the trim ring gear are also disclosed and claimed.
6 Citations
15 Claims
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1. A trim ring gear for use in an integrated drive generator comprising:
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a ring gear body extending between a first end and a second end, and having an inner bore and an outer peripheral surface, a plurality of outer gear teeth on said outer peripheral surface and a plurality of inner gear teeth on an inner surface of said inner bore; wherein said outer gear teeth have a profile defined by roll angles and wherein a first of said outer tooth roll angles is between 16.0 and 17.5°
, a second of said outer tooth roll angles is between 17.5 and 19.0°
, a third of said outer tooth roll angles is between 22.0 and 23.5°
, and a fourth of said outer tooth roll angles is between 23.0 and 24.5°
;said inner gear teeth having a profile defined by inner tooth roll angles, with a first of said inner tooth roll angles being between 31.5 and 33.0°
, a second of said inner tooth roll angles being between 30.0 and 31.5°
, a third of said inner tooth roll angles being between 25.5 and 27.0°
, and a fourth of said inner tooth roll angles being between 24.0 and 25.5°
; andwherein said inner gear teeth are within a radially smaller portion of said ring gear body and said inner gear teeth being at an axially intermediate location spaced towards said second end from a radially enlarged portion carrying said outer gear teeth. - View Dependent Claims (2, 3, 4, 5)
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6. An integrated drive generator comprising:
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an input shaft for driving a carrier shaft in a differential, said carrier shaft driving two sets of planet gears, a first set of said planet gears for driving a first ring gear; a second set of said planet gears for driving a trim ring gear portion; said trim ring gear extending between a first end and a second end, and having an inner bore and an outer peripheral surface, a plurality of outer gear teeth on said outer peripheral surface and a plurality of inner gear teeth on an inner surface of said inner bore; wherein said outer teeth have a profile defined by roll angles at and wherein a first of said outer tooth roll angles is between 16.0 and 17.5°
, a second of said outer tooth roll angles is between 17.5 and 19.0°
, a third of said outer tooth roll angles is between 22.0 and 23.5°
, and a fourth of said outer tooth roll angles is between 23.0 and 24.5°
; andsaid inner gear teeth having a profile defined by inner tooth roll angles, with a first of said inner tooth roll angles being between 31.5 and 33.0°
, a second of said inner tooth roll angles being between 30.0 and 31.5°
, a third of said inner tooth roll angles being between 25.5 and 27.0°
, and a fourth of said inner tooth roll angles being between 24.0 and 25.5°
; andwherein said inner gear teeth are within a radially smaller portion of said trim ring gear and said inner gear teeth being at an axially intermediate location spaced towards said second end from a radially enlarged portion carrying said outer gear teeth. - View Dependent Claims (7, 8, 9, 10)
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11. A method of replacing a trim ring gear in an integrated drive generator comprising the steps of:
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removing an existing trim ring gear from an integrated drive generator having an input shaft connected for driving a carrier shaft in a differential, said carrier shaft connected for driving two sets of planet gears, a first set of said planet gears for driving a first ring gear portion, which in turn is connected to drive a generator rotor, a second set of said planet gears for driving said existing trim ring gear; inserting a replacement trim ring gear for the existing trim ring gear, the replacement trim ring gear having a ring gear body extending between a first end and a second end, and having an inner bore and an outer peripheral surface, and a plurality of outer gear teeth on said outer peripheral surface and a plurality of inner gear teeth on an inner surface of said inner bore; said outer gear teeth having a profile defined by roll angles and wherein a first of said outer tooth roll angles is between 16.0 and 17.5°
, a second of said outer tooth roll angles is between 17.5 and 19.0°
, a third of said outer tooth roll angles is between 22.0 and 23.5°
, and a fourth of said outer tooth roll angles is between 23.0 and 24.5°
;said inner gear teeth having a profile defined by inner tooth roll angles, with a first of said inner tooth roll angles being between 31.5 and 33.0°
, a second of said inner tooth roll angles being between 30.0 and 31.5°
, a third of said inner tooth roll angles being between 25.5 and 27.0°
, and a fourth of said inner tooth roll angles being between 24.0 and 25.5°
; andwherein said inner gear teeth are within a radially smaller portion of said trim ring gear and said inner gear teeth being at an axially intermediate location spaced towards said second end from a radially enlarged portion carrying said outer gear teeth. - View Dependent Claims (12, 13, 14, 15)
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Specification