# US 10,501,168 B2 · Stiffened hub for unshrouded propeller

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- Number: US 10,501,168 B2
- Document ID: US10501168B2
- Status: Granted
- Kind: B2
- Application number: 15/312,381
- Filed: 2015-05-07
- Published: 2017-03-23
- Granted: 2019-12-10
- Earliest claimed: 2014-05-21
- Assignees: Safran Aircraft Engines
- Applicants: Safran Aircraft Engines
- Inventors: Sebastien Emile Philippe Tajan; Charles-Henri Michel Marie Derrez; Caroline Adeline Herauville; Anthony Lafitte; Cyril Roger Yves Le Pecheur
- Web page: https://patentgrep.com/patent/US10501168B2

## CPC

- B64C 11/06: for variable-pitch blades
- F01D 7/00: Rotors with blades adjustable in operation; Control thereof (for reversing F01D1/30)
- F04D 29/326: {comprising a rotating shroud}
- Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft
- B64C: AEROPLANES; HELICOPTERS
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The invention relates to a hub for an unducted propeller (14) having variable-pitch blades (18) of a turbine engine, comprising two parallel annular side walls (34) between which are arranged rings (36) which are distributed angularly in a regular manner around a longitudinal axis (A) of the hub, which are connected to the annular side walls (34), and which comprise compartments (26) receiving bearings (32) having radial axes (R) for guiding in rotation roots (30) of blades of said propeller, said rings (36) being connected in pairs by connection means (40) which are arranged between the annular side walls (34) and which comprise substantially radial reinforcing partitions (42, 44, 46), characterised in that at least some of said reinforcing partitions (42, 44, 46) are connected to said annular side walls (34).

## Claims

### Claim 1

The hub for an unducted propeller having variable-pitch blades of a turbine engine, comprising two parallel annular side walls between which are arranged rings which are distributed angularly in a regular manner around a longitudinal axis of the hub, which are connected to the annular side walls, and which comprise compartments which are designed to receive bearings having radial axes for guiding in rotation roots of blades of said propeller, said rings being connected in pairs by connection means which are arranged between the annular side walls and which comprise reinforcing partitions which are substantially radial with respect to the longitudinal axis of the hub, wherein at least some of said reinforcing partitions are connected to said annular side walls.

### Claim 2 (depends on 1)

A hub according to claim 1, wherein the connection means comprise first reinforcing partitions bordering the side walls, and/or second reinforcing partitions bordering the rings, and/or third reinforcing partitions which define recesses between the rings.

### Claim 3 (depends on 2)

A hub according to claim 2, wherein the connection means of two adjacent rings of the rings define a central recess and four peripheral recesses which are regularly distributed around the central recess.

### Claim 4 (depends on 3)

A hub according to claim 3, wherein the central recess has a circular cross section and wherein each peripheral recess has a substantially trapezoidal cross section.

### Claim 5 (depends on 3)

A hub according to claim 3, wherein the central recess has a cross section in the shape of a hexagon and in that each peripheral recess has a substantially triangular cross section.

### Claim 6 (depends on 2)

A hub according to claim 2, wherein the connection means of two adjacent rings of the rings comprise at least two third partitions which cross each other and which define four main recesses.

### Claim 7 (depends on 6)

A hub according to claim 6, wherein the third partitions are oriented either in the transverse and longitudinal directions or diagonally.

### Claim 8 (depends on 2)

A hub according to claim 2, wherein the connection means of two adjacent rings of the rings comprise at least first partitions bordering the side walls, and at least second partitions bordering the rings.

### Claim 9 (depends on 1)

A turbine engine, comprising at least one hub according to claim 1.