Accessory drive gear for integrated drive generator
AssigneeHamilton Sundstrand Corporation
InventorsDerek R. Hochstetler, Ted A. Martin, Duane C. Johnson, Glenn C. Lemmers
Life of this patent
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Abstract
An accessory drive gear for use in the integrated drive generator includes a gear body extending between a first end and a second end and having a plurality of gear teeth at a radially outer surface adjacent the first end, and the gear teeth having a gear tooth profile, with roll angles A, B, C, and D, and the roll angle at A being between 17.0 and 18.5°, the roll angle at B being between 20.0 and 21.5°, the roll angle at C being between 29.5 and 31.0°, and the roll angle at D being between 32.5 and 34.0°. In addition, an integrated drive generator is disclosed as is a method of replacing an accessory drive gear in an integrated drive generator.
Claims20
An accessory drive gear for use in the integrated drive generator comprising:
- a gear body extending between a first end and a second end and having a plurality of gear teeth at a radially outer surface adjacent said first end, and said gear teeth having a gear tooth profile, with roll angles A, B, C, and D, and the roll angle at A being between 17.0 and 18.5°, the roll angle at B being between 20.0 and 21.5°, the roll angle at C being between 29.5 and 31.0°, and the roll angle at D being between 32.5 and 34.0°.
An integrated drive generator comprising:
- an input shaft, a gear differential including a carrier shaft to be driven by said input shaft including a ring gear connected for driving a generator;
- said carrier shaft also connected to drive an accessory drive gear, said accessory drive gear connected to drive at least one driven gear to, in turn, drive at least one pump;
- and
- said accessory drive gear including a gear body extending between a first end and a second end and having a plurality of gear teeth at a radially outer surface adjacent said first end, and said gear teeth having a gear tooth profile, with roll angles A, B, C, and D, and the roll angle at A being between 17.0 and 18.5°, the roll angle at B being between 20.0 and 21.5°, the roll angle at C being between 29.5 and 31.0°, and the roll angle at D being between 32.5 and 34.0°.
A method of replacing accessory drive gear comprising the steps of:
- removing an existing accessory drive gear from an integrated drive generator having an input shaft, a gear differential including a carrier shaft and the gear differential including a ring gear for driving a generator;
- said carrier shaft also connected for driving said existing accessory drive gear, said existing accessory drive gear connected for driving at least one driven gear to, in turn, drive at least one pump;
- and
- replacing the existing accessory drive gear with a replacement accessory drive gear including a gear body extending between a first end and a second end and having a plurality of gear teeth at a radially outer surface adjacent said first end, and said gear teeth having a gear tooth profile, with roll angles at A, B, C, and D, and the roll angle at A being between 17.0 and 18.5°, the roll angle at B being between 20.0 and 21.5°, the roll angle at C being between 29.5 and 31.0°, and the roll angle at D being between 32.5 and 34.0°.
The method of replacing accessory drive gear as set forth in claim 19, wherein a diameter to an outer diameter of 1.94 inches (4.93 cm), a pitch diameter of 1.85 inches (4.7 cm), and a root diameter of 1.75 inches (4.45 cm), each with a tolerance of ±0.1 inch (0.25 cm).
Dependencies are inferred from the claim text.