GEARBOX RATIO CHANGE
First Claim
1. A method of modifying an existing gearbox comprising the steps of:
- (a) wherein the existing gearbox has an input shaft connected to drive a first idler gear, the first idler gear engages a first fuel pump gear for driving a fuel pump at a first speed, and there being a first distance between a center point of the first idler gear and the fuel pump gear; and
(b) including the step of replacing said first idler gear with a replacement first idler gear having a distinct number of teeth, and replacing said first fuel pump gear with a replacement fuel pump gear having a distinct number of teeth such that a speed output to said fuel pump is distinct from the first speed.
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Accused Products
Abstract
A method of modifying an existing gearbox wherein the existing gearbox has an input shaft connected to drive a first idler gear. The first idler gear engages a gear for driving a fuel pump at a first speed. There is a first distance between a center point of the first idler gear and the fuel pump gear. The step includes replacing the first idler gear with a replacement first idler gear having a distinct number of teeth, and replacing the fuel pump gear with a replacement fuel pump gear having a distinct number of teeth such that a speed output to the fuel pump is distinct from the speed at the fuel pump with the existing gearbox. A gearbox is also disclosed.
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Citations
20 Claims
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1. A method of modifying an existing gearbox comprising the steps of:
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(a) wherein the existing gearbox has an input shaft connected to drive a first idler gear, the first idler gear engages a first fuel pump gear for driving a fuel pump at a first speed, and there being a first distance between a center point of the first idler gear and the fuel pump gear; and (b) including the step of replacing said first idler gear with a replacement first idler gear having a distinct number of teeth, and replacing said first fuel pump gear with a replacement fuel pump gear having a distinct number of teeth such that a speed output to said fuel pump is distinct from the first speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A gearbox for driving a plurality of components associated with a gas turbine engine comprising;
a first idler gear selectively engaged to be driven by an input, wherein said first idler gear drives a fuel pump drive gear at a first speed, wherein a ratio of a diameter of said fuel pump drive gear to a number of teeth on said fuel pump drive gear is not equal to a ratio of a diameter of a gear driving said fuel pump drive gear to a number of teeth on said gear driving said fuel pump drive gear. - View Dependent Claims (18, 19, 20)
Specification