# US 11,994,141 B2 · Turbomachinery shaft with variable lattice densities > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,994,141 B2 - Document ID: US11994141B2 - Status: Granted - Kind: B2 - Application number: 17/472,184 - Filed: 2021-09-10 - Published: 2023-03-16 - Granted: 2024-05-28 - Earliest claimed: 2021-09-10 - Assignees: Hamilton Sundstrand Corporation - Applicants: Hamilton Sundstrand Corporation - Inventors: Brent J. Merritt; Darryl A. Colson - Web page: https://patentgrep.com/patent/US11994141B2 ## CPC - F04D 29/053: Shafts - F04D 17/10: for compressing or evacuating - F04D 29/051: Axial thrust balancing - F16C 3/02: Shafts; Axles - F16C 3/023: {made of several parts, e.g. by welding} - F16C 2360/43: Screw compressors - Y02T 50/50: On board measures aiming to increase energy efficiency - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A rotating shaft for a rotary machine includes a first shaft portion centered on a central axis and a variable lattice structure in an interior of the rotating shaft. The variable lattice structure includes a first region of the rotating shaft having a first lattice structure and a second region of the rotating shaft having a second lattice structure. The second lattice structure of the second region is denser than the first lattice structure of the first region. The second region is a deflection region or a stress region of the rotating shaft. ## Claims ### Claim 1 A rotating shaft for a rotary machine comprising: a first shaft portion centered on a central axis; a rib adjacent to a first side of the first shaft portion and extending radially inward from the first shaft portion; a flange adjacent to a second side of the first shaft portion and extending radially inward from the first shaft portion; a second shaft portion extending away from the second side of the first shaft portion and including a second side located axially away from the first shaft portion; and a variable lattice structure in an interior of the rotating shaft, the variable lattice structure comprises: a first region of the rotating shaft having a first lattice structure; and a second region of the rotating shaft having a second lattice structure; wherein the second lattice structure of the second region is denser than the first lattice structure of the first region; and wherein the second region is a deflection region or a stress region of the rib, the flange, or a region in the second side of the second shaft portion of the rotating shaft. ### Claim 2 (depends on 1) The rotating shaft of claim 1, wherein the rotating shaft has a continuous exterior solid surface surrounding the variable lattice structure. ### Claim 3 (depends on 1) The rotating shaft of claim 1, wherein the stress region of the rotating shaft is a region of the rotating shaft that is subject to higher stress than other regions of the rotating shaft. ### Claim 4 (depends on 3) The rotating shaft of claim 3, wherein the stress region of the rotating shaft is the flange extending radially inward from the first shaft portion. ### Claim 5 (depends on 3) The rotating shaft of claim 3, wherein the stress region of the rotating shaft is the region in a second side of the second shaft portion. ### Claim 6 (depends on 1) The rotating shaft of claim 1, wherein the deflection region of the rotating shaft is a region of the rotating shaft that is subject to deflections. ### Claim 7 (depends on 6) The rotating shaft of claim 6, wherein the deflection region of the rotating shaft is the rib extending radially inward from the first shaft portion. ### Claim 8 (depends on 1) The rotating shaft of claim 1, wherein the rotating shaft is made of a material selected from the group consisting of stainless steel, corrosion-resistant steel, nickel-chromium alloy, aluminum, titanium, synthetic fiber, fiberglass, composites, and combinations thereof. ### Claim 9 (depends on 1) The rotating shaft of claim 1, and further comprising: a disk portion extending radially outward from a first side of the first shaft portion. ### Claim 10 A rotary machine comprising: a tie rod extending through the rotary machine; and a rotating shaft mounted on the tie rod, wherein the rotating shaft comprises: a first shaft portion centered on a central axis; and a rib adjacent to a first side of the first shaft portion and extending radially inward from the first shaft portion; a flange adjacent to a second side of the first shaft portion and extending radially inward from the first shaft portion; a second shaft portion extending away from the second side of the first shaft portion and including a second side located axially away from the first shaft portion; and a variable lattice structure in an interior of the rotating shaft, the variable lattice structure comprises: a first region of the rotating shaft having a first lattice structure; and a second region of the rotating shaft having a second lattice structure; wherein the second lattice structure of the second region is denser than the first lattice structure of the first region; and wherein the second region is a deflection region or a stress region of the rib, the flange, or a region in the second side of the second shaft portion of the rotating shaft. ### Claim 11 (depends on 10) The rotary machine of claim 10, wherein the rotating shaft has a continuous exterior solid surface surrounding the variable lattice structure. ### Claim 12 (depends on 10) The rotary machine of claim 10, wherein the stress region of the rotating shaft is a region of the rotating shaft that is subject to higher stress than other regions of the rotating shaft. ### Claim 13 (depends on 12) The rotary machine of claim 12, wherein the stress region of the rotating shaft is the flange extending radially inward from the first shaft portion that abuts the tie rod of the rotary machine. ### Claim 14 (depends on 12) The rotary machine of claim 12, wherein the stress region of the rotating shaft is the region in a second side of the second shaft portion that abuts a motor rotor of the rotary machine. ### Claim 15 (depends on 10) The rotary machine of claim 10, wherein the deflection region of the rotating shaft is the region of the rotating shaft that is subject to deflections. ### Claim 16 (depends on 15) The rotary machine of claim 15, wherein the deflection region of the rotating shaft is the rib extending radially inward from the first shaft portion. ### Claim 17 (depends on 10) The rotary machine of claim 10, wherein the rotating shaft is made of a material selected from the group consisting of stainless steel, corrosion-resistant steel, nickel-chromium alloy, aluminum, titanium, synthetic fiber, fiberglass, composites, and combinations thereof. ### Claim 18 (depends on 10) The rotary machine of claim 10, wherein the rotating shaft further comprises: a disk portion extending radially outward from a first side of the first shaft portion.