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US 10,883,495 B2Granted
Scavenge/charge pump drive gear for integrated drive generator
AssigneeHamilton Sundstrand Corporation
InventorsDerek R. Hochstetler, Ted A. Martin, Duane C. Johnson, Glenn C. Lemmers, Jr.
Life of this patent
Estimating the term…
Abstract
A scavenge/charge pump drive gear for use in an integrated drive generator has a gear body extending between a first end and a second end and having a disc extending radially outwardly. A boss extends from the disc toward the second end. There are outer gear teeth outwardly of an outer diameter of the disc. The outer gear teeth have a unique gear tooth profile with roll angles A, B, C, and D. An integrated drive generator and a method are also disclosed.
Claims3
A scavenge/charge pump drive gear for use in an integrated drive generator comprising:
- a gear body extending between a first end and a second end and having a disc extending radially outwardly, and a boss extending from said disc toward said second end, there being outer gear teeth outwardly of an outer diameter of said disc, said outer gear teeth having a gear tooth profile with roll angles A, B, C, and D, and the roll angle at A for said outer gear teeth being between 20.9 and 22.3 degrees, the roll angle at B for said outer gear teeth being between 22.7 and 24.2 degrees, the roll angle at C for said outer gear teeth being between 28.2 and 29.7 degrees, and the roll angle at D for said outer gear teeth being between 30.0 and 31.5 degrees;
- wherein said outer gear teeth have a pitch diameter of 3.10 inches (7.87 centimeters) with a tolerance of +/−0.01 inch (0.025 centimeters);
- wherein there are 62 of said outer gear teeth;
- wherein there are eight spline teeth within a bore in said boss;
- and
- wherein said outer gear teeth have a maximum form diameter of 3.00 inches (7.62 centimeters).
3 more elements
An integrated drive generator comprising:
- an input shaft, a gear differential including a carrier shaft being driven by said input shaft and including a ring gear connected for driving a generator;
- said ring gear also connected to drive an accessory drive gear, said accessory drive gear connected to drive a scavenge/charge pump drive gear;
- and said scavenge/charge pump drive gear comprising a gear body extending between a first end and a second end and having a disc extending radially outwardly, and a boss extending from said disc toward said second end, there being outer gear teeth outwardly of an outer diameter of said disc, said outer gear teeth having a gear tooth profile with roll angles A, B, C, and D, and the roll angle at A for said outer gear teeth being between 20.9 and 22.3 degrees, the roll angle at B for said outer gear teeth being between 22.7 and 24.2 degrees, the roll angle at C for said outer gear teeth being between 38.2 and 29.7 degrees;
- wherein said outer gear teeth have a pitch diameter of 3.10 inches (7.87 centimeters) with a tolerance of +/−0.01 inch (0.025 centimeters);
- wherein there are 62 of said outer gear teeth;
- wherein there are eight spline teeth within a bore in said boss;
- wherein said outer gear teeth have a maximum form diameter of 3.00 inches (7.62 centimeters);
- and
- said outer gear teeth engaged to be driven by said accessory drive gear, said outer gear teeth also engaging a gear to rotate a deaerator, and a shaft received in a bore in said boss, said shaft driving a charge pump, and said charge pump connected to drive a scavenge pump.
6 more elements
A method of replacing a scavenge/charge pump drive gear comprising the steps of:
- a) removing an existing scavenge/charge pump 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 ring gear also connected for driving an accessory drive gear, said accessory drive gear being connected for driving said existing scavenge/charge pump drive gear to, in turn, drive a charge pump through a shaft;
- and
- b) replacing the existing scavenge/charge pump drive gear with a replacement scavenge/charge pump drive gear including a gear body extending between a first end and a second end and having a disc extending radially outwardly, and a boss extending from said disc toward said second end, there being outer gear teeth outwardly of an outer diameter of said disc, said outer gear teeth having a gear tooth profile with roll angles A, B, C, and D, and the roll angle at A for said outer gear teeth being between 20.9 and 22.3 degrees, the roll angle at B for said outer gear teeth being between 22.7 and 24.2 degrees, the roll angle at C for said outer gear teeth being between 28.2 and 29.7 degrees, and the roll angle at D for said outer gear teeth being between 30.0 and 31.5 degrees;
- wherein said outer gear teeth have a pitch diameter of 3.10 inches (7.87 centimeters) with a tolerance of +/−0.01 inch (0.025 centimeters);
- wherein there are 62 of said outer gear teeth;
- wherein there are eight spline teeth within a bore in said boss;
- wherein said outer gear teeth have a maximum form diameter of 3.00 inches (7.62 centimeters).
4 more elements
Dependencies are inferred from the claim text.