# US 10,767,500 B2 · Fan blade pitch setting > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,767,500 B2 - Document ID: US10767500B2 - Status: Granted - Kind: B2 - Application number: 15/148,782 - Filed: 2016-05-06 - Published: 2017-11-09 - Granted: 2020-09-08 - Earliest claimed: 2016-05-06 - Assignees: GE Aviation Systems LLC - Applicants: GE Aviation Systems, LLC - Inventors: Sukeyuki Kobayashi - Web page: https://patentgrep.com/patent/US10767500B2 ## CPC - F01D 7/00: Rotors with blades adjustable in operation; Control thereof (for reversing F01D1/30) - F04D 29/34: Blade mountings {(for axial flow compressors F04D29/322)} - F04D 29/36: adjustable {(flexible blades F04D29/382)} - F01D 5/3069: {between two discs or rings} - 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) ## Abstract There are provided techniques and apparatuses for fan blade pitch setting. For example, there is provided an impeller including a ring disposed in a hub of the impeller. The ring can include a recess shaped and positioned to impart a specified pitch angle to a blade extending outwardly from the ring through the hub. ## Claims ### Claim 1 An impeller comprising: a ring disposed in a hub of the impeller, wherein the hub has a slot formed through a wall of the hub such that the slot has an open end at one edge of the wall and is configured to receive a portion of a blade through the open end, the ring including a non-circular recess shaped and positioned to impart a specified pitch angle to the blade extending outwardly from the ring through the slot of the hub, the non-circular recess being elongated in a direction different from the slot and non-parallel to a vertical axis where the vertical axis is parallel to an axis of rotation of the impeller; wherein the blade includes a first portion and a second portion joined by a rod, the second portion engaging the recess to position the blade at the specified pitch angle. ### Claim 2 (depends on 1) The impeller of claim 1, wherein the ring is secured to the hub by a fastener. ### Claim 3 (depends on 1) The impeller of claim 1, further comprising a hub reinforcement ring disposed on an outside wall of the hub. ### Claim 4 (depends on 1) The impeller of claim 1, wherein the hub and the blade are each made of a same material. ### Claim 5 (depends on 1) The impeller of claim 1, wherein the hub is made of an aluminum alloy. ### Claim 6 (depends on 1) The impeller of claim 1, wherein the specified pitch angle is about 50 degrees. ### Claim 7 An impeller comprising: a blade including a portion shaped to mate with a recess of a ring disposed in a hub of the impeller, the recess being elongated in a direction different from the slot and non-parallel to a vertical axis to provide a specified pitch angle for the blade, the vertical axis being parallel to an axis of rotation of the impeller, and the hub has a slot formed through a wall of the hub such that the slot has an open end at one edge of the wall and is configured to receive a portion of the blade through the open end. ### Claim 8 (depends on 7) The impeller of claim 7, wherein the blade is made of a same material as that of the hub. ### Claim 9 An impeller assembly, comprising: a set of blades; a hub that has a set of slots formed through one wall of the hub such that each slot has an open end at one edge of the wall and is configured to receive a portion of a blade from a set of blades through the open end; and a pitch-setting ring disposed on an inner wall of the hub, the pitch-setting ring including a set of recesses, wherein each of the recesses is fully enclosed and elongated in a direction non-parallel to a vertical axis and configured to secure the blade from the set of blades at a specified pitch angle and such that the blade is positioned such that it extends through a slot wherein the vertical axis is parallel to an axis of rotation of the impeller. ### Claim 10 (depends on 9) The impeller assembly of claim 9, wherein the pitch-setting ring is fastened on the hub by screws or pins. ### Claim 11 (depends on 9) The impeller assembly of claim 9, wherein a first blade and a second blade included in the set of blades have different pitch angles. ### Claim 12 (depends on 9) The impeller assembly of claim 9, wherein blades from at least one subset of the set of blades have a same pitch angle. ### Claim 13 (depends on 9) The impeller assembly of claim 9, further comprising a hub reinforcement ring disposed on an outside wall of the hub. ### Claim 14 (depends on 9) The impeller assembly of claim 9, wherein the specified pitch angle is about 50 degrees.