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US 2026/0177203 A1Published application
Pump assembly
AssigneePratt & Whitney Canada Corp.
InventorPawel Rak
Life of this patent
Estimating the term…
Abstract
A pump assembly of an aircraft engine includes a pump housing, a first pump stage positioned in the housing and including two first stage rotating elements meshed at a first mesh location, and a second pump stage positioned in the housing and including two second stage rotating elements meshed at a second mesh location. The first stage rotating elements are retained at respective shafts by one or more woodruff keys, and at least one second stage rotating element of the two second stage rotating elements is secured at its respective shaft via a spline connection of the at least one second stage rotating element to the respective shaft.
Claims20
A pump assembly of an aircraft engine, comprising:
- a pump housing;
- a first pump stage disposed in the housing and including two first stage rotating elements meshed at a first mesh location;
- a second pump stage disposed in the housing and including two second stage rotating elements meshed at a second mesh location;
- wherein the first stage rotating elements are retained at respective shafts by one or more woodruff keys;
- and
- wherein at least one second stage rotating element of the two second stage rotating elements is secured at its respective shaft via a spline connection of the at least one second stage rotating element to the respective shaft;
- wherein the at least one second stage rotating element includes an element flange extending axially from the at least one second stage rotating element, the element flange at least partially defining the spline connection;
- further comprising a first journal bearing supportive of the respective shaft defined by the pump housing and the respective shaft;
- and
- further comprising a second journal bearing defined by an outer surface of the element flange and the housing, the second journal bearing radially offset from the first journal bearing.
7 more elements
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A pump assembly for an aircraft engine, comprising:
- a housing:
- a first shaft disposed in the housing;
- a second shaft disposed in the housing;
- two first stage gears disposed in the housing, a first first stage gear of the two first stage gears disposed along the first shaft and a second first stage gear of the two first stage gears disposed along the second shaft, the two first stage gears meshed-in at a first mesh location;
- two second stage gears disposed in the housing, a first second stage gear of the two second stage gears disposed along the first shaft and a second second stage gear of the two second stage gears disposed along the second shaft, the two second stage gears meshed-in at a second mesh location;
- wherein the two first stage gears are retained at their respective shafts by one or more woodruff keys;
- and
- wherein the first second stage gear is secured at the first shaft via a spline connection of the first second stage gear to the first shaft;
- further comprising a gear flange extending axially from the first second stage gear, the gear flange at least partially defining the spline connection;
- further comprising a first journal bearing supportive of the first shaft defined by the housing and the first shaft;
- and
- further comprising a second journal bearing defined by an outer surface of the gear flange and the housing, the second journal bearing radially offset from the first journal bearing.
9 more elements
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A gas turbine engine system, comprising:
- a gas turbine engine;
- a pump operably connected to the gas turbine engine to provide a fluid flow to the gas turbine engine, the pump including:
- a housing:
- a first shaft disposed in the housing;
- a second shaft disposed in the housing;
- two first stage gears disposed in the housing, a first first stage gear of the two first stage gears disposed along the first shaft and a second first stage gear of the two first stage gears disposed along the second shaft, the two first stage gears enmeshed at a first mesh location;
- two second stage gears disposed in the housing, a first second stage gear of the two second stage gears disposed along the first shaft and a second second stage gear of the two second stage gears disposed along the second shaft, the two second stage gears enmeshed at a second mesh location;
- wherein the two first stage gears are retained at their respective shafts by one or more woodruff keys;
- and
- wherein the first second stage gear is secured at the first shaft via a spline connection of the first second stage gear to the first shaft;
- further comprising a gear flange extending axially from the first second stage gear, the gear flange at least partially defining the spline connection;
- further comprising a first journal bearing supportive of the first shaft defined by the housing and the first shaft;
- and
- further comprising a second journal bearing defined by an outer surface of the gear flange and the housing, the second journal bearing radially offset from the first journal bearing.
11 more elements
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Dependencies are inferred from the claim text.