Split accessory drive system
First Claim
Patent Images
1. A gas turbine engine comprising:
- a spool;
a first accessory gearbox connected to and driven by the spool and positioned substantially inside a core cowling;
a second accessory gearbox connected to and driven by the first accessory gearbox and positioned substantially outside of the core cowling on a fan case;
a scavenge pump connected between the first accessory gearbox and the second accessory gearbox, wherein the first accessory gearbox drives the second accessory gearbox through the scavenge pump;
a supply pump connected to and driven by the second accessory gearbox;
an oil tank positioned on the fan case;
an oil filter positioned on the fan case; and
a lubrication circuit connecting the scavenge pump, the supply pump, the oil tank, and the oil filter.
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Accused Products
Abstract
A gas turbine engine includes a spool, a first accessory gearbox, a second accessory gearbox, and a scavenge pump. The first accessory gearbox is connected to and driven by the spool. The second accessory gearbox is connected to and driven by the first accessory gearbox. The scavenge pump is connected between the first accessory gearbox and the second accessory gearbox. The first accessory gearbox drives the second accessory gearbox through the scavenge pump.
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Citations
17 Claims
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1. A gas turbine engine comprising:
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a spool; a first accessory gearbox connected to and driven by the spool and positioned substantially inside a core cowling; a second accessory gearbox connected to and driven by the first accessory gearbox and positioned substantially outside of the core cowling on a fan case; a scavenge pump connected between the first accessory gearbox and the second accessory gearbox, wherein the first accessory gearbox drives the second accessory gearbox through the scavenge pump; a supply pump connected to and driven by the second accessory gearbox; an oil tank positioned on the fan case; an oil filter positioned on the fan case; and a lubrication circuit connecting the scavenge pump, the supply pump, the oil tank, and the oil filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for driving accessories on a gas turbine engine, the method comprising:
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driving a scavenge pump via a first accessory gearbox that is positioned substantially inside a core cowling; driving a second accessory gearbox that is positioned substantially outside of the core cowling on a fan case via the scavenge pump; driving a supply pump via the second accessory gearbox; and flowing a lubricating liquid through a lubrication circuit that includes the scavenge pump, the supply pump, an oil tank positioned on the fan case, and an oil filter positioned on the fan case. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification