Auxiliary oil supply apparatus for a rotating component
An auxiliary oil supply apparatus for a rotating device ( 50, 51 ), the rotating device comprising a primary oil supply ( 52 ), a rotating component ( 50 ) and a static component ( 51 ) situated radially outwardly of a centre of rotation of the rotating component ( 50 ) and arranged to collect oil ( 58 ) held radially outwardly from the rotating component ( 50 ) as the rotating component rotates. The auxiliary oil apparatus comprises a scoop ( 56 ) associated with the rotating component ( 50 ) and is responsive to a change in a known parameter to move between a first position in the static component ( 51 ) to a second position between the static component ( 51 ) and the centre of rotation.
1. An assembly comprising:
a rotating device, comprising:
a primary oil supply;
a rotating component; and
a static component situated radially outwardly of a center of rotation of the rotating component and arranged to collect oil held radially outwardly from the rotating component as the rotating component rotates;
an auxiliary oil apparatus for supplying oil to the rotating component, the auxiliary oil apparatus comprising:
a scoop associated with the rotating component and responsive to a change in a known parameter to move between a first position in the static component to a second position between the static component and the center of rotation of the rotating component, wherein the known parameter is a rotational speed of the rotating component, the known parameter having two identifiable conditions, the first condition corresponding to a first rotational speed range of the rotating component and the second condition corresponding to a second rotational speed range of the rotating component.
2. The assembly as claimed in claim 1 , wherein the first rotational speed range corresponds to the rotating component being power driven and the second rotational speed range corresponds to the rotating component not being power driven.
3. The assembly as claimed in claim 1 , wherein the scoop is pivotally mounted to the rotating component and balanced by a counterweight, the counterweight selected to move radially outwardly of the center of rotation under centrifugal forces generated during the second condition, and radially inwards during the first condition and causing the scoop to move radially inwards to the second position in the first condition and radially outwards to the first position in the second condition.
4. The assembly as claimed in claim 1 , wherein the scoop is in fluid communication with a hose, the hose being in fluid communication with an element of the rotating component to which oil is required to be delivered.
5. The assembly as claimed in claim 1 , further comprising a retractor device associated with the scoop for returning the scoop from the second position to the first position whereby to deliver oil scooped from the static component to an element of the rotating component.
6. The assembly as claimed in claim 5 , wherein the retractor device has an equilibrium position at which the scoop is held in the first position.
7. The assembly as claimed in claim 5 , wherein the retractor device is selected from: a torsion spring, a tension spring, a compression spring, a hydraulic actuator or a pneumatic actuator.
8. The assembly as claimed in claim 1 , wherein the oil collected in the static component is oil supplied by the primary oil supply and which has migrated to the static component.
9. The apparatus as claimed in claim 1 , wherein the rotating device is an epicyclic gear box.
10. The apparatus as claimed in claim 9 , wherein the epicyclic gear box is in a planetary configuration and the rotating component of the rotating device is a planet carrier.
11. The apparatus as claimed in claim 9 , wherein the epicyclic gear box is arranged axially between a turbine shaft and fan shaft of a gas turbine engine whereby to provide a speed reduction transmission from the turbine shaft to the fan shaft.
12. An assembly comprising:
a rotating device comprising:
a primary oil supply;
a rotating component; and
a static component situated radially outwardly of a center of rotation of the rotating component and arranged to collect oil held radially outwardly from the rotating component as the rotating component rotates;
an auxiliary oil apparatus for supplying oil to the rotating component, the auxiliary oil apparatus comprising:
a scoop associated with the rotating component and responsive to a change in a known parameter to move between a first position in the static component to a second position between the static component and the center of rotation, wherein the known parameter is the pressure of oil in the primary oil supply, the known parameter having two identifiable conditions, the first condition corresponding to a first oil pressure range in the primary oil supply and the second condition corresponding to a second oil pressure range in the primary oil supply.
13. The assembly according to claim 12 , wherein the primary oil supply is in fluid communication with a piston slidably engaged in a cylinder arranged such that the piston moves within the cylinder responsive to pressure changes in the primary oil supply and wherein the scoop is connected to the piston such that movement of the piston causes the scoop to move between the first position and the second position.
14. The assembly as claimed in claim 12 , wherein the first oil pressure range corresponds to where the primary oil supply is actively delivering oil and the second oil pressure range corresponds to a second condition where the primary oil supply is not actively delivering oil.
15. The assembly as claimed in claim 12 , wherein the scoop is in fluid communication with a hose, the hose being in fluid communication with an element of the rotating component to which oil is required to be delivered.
16. The apparatus as claimed in claim 12 , wherein the rotating device is an epicyclic gear box.
17. The apparatus as claimed in claim 16 , wherein the epicyclic gear box is in a planetary configuration and the rotating component of the rotating device is a planet carrier.
18. The apparatus as claimed in claim 16 , wherein the epicyclic gear box is arranged axially between a turbine shaft and fan shaft of a gas turbine engine whereby to provide a speed reduction transmission from the turbine shaft to the fan shaft.