Pitch-changing system equipped with means for lubricating a load-transfer bearing

Patent metadata

Field	Value
Publication number	US-10940938-B2
Application number	US-201716327288-A
Country	US
Kind code	B2
Filing date	Aug 16, 2017
Priority date	Aug 26, 2016
Publication date	Mar 9, 2021
Grant date	Mar 9, 2021

Abstract

A system for changing the pitch of blades of at least one turbomachine rotor is provided. The system generally includes a control means acting on a connecting mechanism connected to the blades of the rotor and having a body mobile in translation along a longitudinal axis with respect to a fixed body, load-transfer bearing mounted on the mobile body cooperating with the connecting mechanism, and means for lubricating the bearing having a lubricant duct and extending radially above the fixed and mobile bodies. The duct generally includes first and second telescopic tubular parts that slide coaxially with respect to one another, the first part connected to the fixed body and the second part connected to the mobile body, and means for spraying lubricant into the bearing mounted on the mobile body and lubricant supply conduit mounted on the mobile body to connect the duct to the spraying means.

First claim

The invention claimed is:

1. A system for changing a pitch of a plurality of blades of at least one turbomachine propeller having the plurality of blades, the system comprising:
a control means acting on a connecting mechanism that is connected to the plurality of blades of the propeller, the control means having a fixed body and a mobile body which translates along a longitudinal axis with respect to the fixed body;
a load-transfer module arranged between the connecting mechanism and the control means, the load-transfer module having at least one load-transfer bearing mounted on the mobile body and cooperating with the connecting mechanisms; and
means for lubricating the load-transfer bearing, comprising:
at least one lubricant duct configured to be connected to a source of supply of lubricant, the lubricant duct extending radially outside the mobile body with respect to the longitudinal axis and comprising at least a first and second part being tubular and telescopically slidably mounted with respect to one another along an axis parallel to the longitudinal axis, the first part connected by a first upstream end to the fixed body and the second part connected by a first downstream end to the mobile body;
means for spraying lubricant into the load-transfer bearing mounted on the mobile body; and
at least one lubricant supply conduit mounted on the mobile body and configured to transfer the lubricant from the at least one lubricant duct to the spraying means.

2. The system of claim 1 , wherein the first part slides inside the second part.

3. The system of claim 1 , wherein the first part comprises a first end fixed to a connection ring of the fixed body, the connection ring secured to a fixed casing of the turbomachine.

4. The system of claim 3 , wherein the first part is positioned in a vicinity of a second free end of the first part with at least one first vent hole having a first central axis and a second vent hole having a second central axis, the first and second central axes being perpendicular to the longitudinal axis and being defined in offset and substantially parallel planes.

5. The system of claim 1 , wherein the first part is formed from first and second tubular portions aligned substantially along the same axis, the first and second tubular portions connected together by an annular connecting member configured to maintain a seal between the first and second tubular portions in case of misalignment of the first and second tubular portions.

6. The system of claim 5 , wherein a ball-joint connection is interposed at each free end of the first and second portions and between walls of the first and second portions and of the annular connecting member.

7. The system of claim 1 , wherein the load-transfer module comprises an inner ferrule on which are mounted the spraying means, the inner ferrule having an orifice with a radial axis coaxial to an opening of an inner ring of the bearing, the spraying means extending at least partially through the orifice and the opening.

8. The system of claim 1 , wherein the load-transfer bearing includes a double-row bearing and the spraying means comprise at least two nozzles for each row, the nozzles distributed azimuthally around the longitudinal axis.

9. The system of claim 1 , wherein the at least one lubricant supply conduit comprises an arched tubular body which is arranged at least partially around the mobile body and fixed on a rear face of an inner ferrule.

10. The system of claim 9 , wherein the at least one lubricant supply conduit comprises tubes extending along an axis substantially parallel to the longitudinal axis the tubes connected by a first end to the arched tubular body of the at least one lubricant supply conduit and by a second end to the means for spraying.

Assignees

• Safran Aircraft Engines

Inventors

• Servant Régis Eugène Henri
• Lafitte Anthony
• Souryavongsa Eddy Keomorakott
• Tajan Sébastien Emile Philippe
• Martin Arnaud

Classifications

• B64C11/303 Primary

  characterised by comprising a governor · CPC title

• F02K3/062

  with aft fan · CPC title

• F01D25/16

  Arrangement of bearings; Supporting or mounting bearings in casings (bearings per se F16C) · CPC title

• B64C11/306

  specially adapted for contrarotating propellers · CPC title

• F01M1/02

  using lubricating pumps (pumps in general F04; lubricating pumps per se F16N) · CPC title