Patents by Inventor Mark Spruce

Mark Spruce has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20210404390
    Abstract: Gas turbine engine for aircraft includes: an engine core including a turbine, compressor, and core shaft connecting the turbine to the compressor; a fan located upstream of the core; a gearbox; and a gearbox support arranged to at least partially support the gearbox. A moment of inertia of the fan is greater than or equal to 7.40×107 kgm2. A radial bending stiffness to moment of inertia ratio of: the ? ? radial ? ? ? bending ? ? stiffness ? ? of ? ? at ? ? least ? ? one ? ? of ? ? the ? ? fan ? ? shaft ? ? at ? ? the ? ? output ? ? of ? ? the ? ? gearbox ? ? and ? ? the ? ? gearbox ? ? support the ? ? moment ? ? of ? ? inertia ? ? of ? ? the ? ? fan may be greater than or equal to 2.5×10?2 Nkg?1m?3.
    Type: Application
    Filed: April 29, 2021
    Publication date: December 30, 2021
    Applicant: ROLLS-ROYCE plc
    Inventor: Mark SPRUCE
  • Publication number: 20210404391
    Abstract: The present disclosure relates to gearboxes for aircraft gas turbine engines, in particular to arrangements for journal bearings such gearboxes, and to related methods of operating such gearboxes and gas turbine engines. Example embodiments include a gearbox for an aircraft gas turbine engine, the gearbox comprising: a sun gear; a plurality of planet gears surrounding and engaged with the sun gear; and a ring gear surrounding and engaged with the plurality of planet gears, each of the plurality of planet gears being rotatably mounted around a pin of a planet gear carrier with a journal bearing having an internal sliding surface on the planet gear and an external sliding surface on the pin.
    Type: Application
    Filed: September 13, 2021
    Publication date: December 30, 2021
    Applicant: ROLLS-ROYCE plc
    Inventor: Mark SPRUCE
  • Publication number: 20210372329
    Abstract: An engine for an aircraft includes an engine core having a turbine, a compressor, and a core shaft connecting the turbine to the compressor; a fan located upstream of the engine core, the fan having a plurality of fan blades; and a gearbox. The gearbox is an epicyclic gearbox and comprises a sun gear, a plurality of planet gears, a ring gear, and a planet carrier on which the planet gears are mounted. The radial bending stiffness of the planet carrier is equal to or greater than 1.20×109 N/m, and/or the tilt stiffness of the planet carrier is greater than or equal to 6.00×108 Nm/rad. A method of operation of such an engine is also disclosed.
    Type: Application
    Filed: August 17, 2021
    Publication date: December 2, 2021
    Applicant: ROLLS-ROYCE plc
    Inventor: Mark SPRUCE
  • Patent number: 11162431
    Abstract: A gas turbine engine for an aircraft including an engine core including a turbine, compressor, and core shaft connecting the turbine and compressor; a fan located upstream of the engine core including a plurality of fan blades; a gearbox that can receive input from the core shaft and can output drive to the fan at a lower rotational speed than the core shaft, an epicyclic gearbox including a sun gear, planet gears, a ring gear, and a planet carrier on which the planet gears are mounted; and a gearbox support. A first gearbox support shear stress ratio: torsional ? ? shear ? ? stress ? ? of ? ? the ? ? gearbox ? ? support ? at ? ? maxiumum ? ? take ? ? off ? ? conditions radial ? ? bending ? ? stiffness ? ? of ? ? the ? ? gearbox ? ? support is less than or equal to 4.
    Type: Grant
    Filed: October 5, 2020
    Date of Patent: November 2, 2021
    Assignee: ROLLS-ROYCE plc
    Inventor: Mark Spruce
  • Patent number: 11149652
    Abstract: Gearboxes for aircraft gas turbine engines, in particular to arrangements for journal bearings such gearboxes, and to related methods of operating such gearboxes and gas turbine engines. Example embodiments include a gearbox for an aircraft gas turbine engine, the gearbox including: a sun gear; a plurality of planet gears surrounding and engaged with the sun gear; and a ring gear surrounding and engaged with the plurality of planet gears, each of the plurality of planet gears being rotatably mounted around a pin of a planet gear carrier with a journal bearing having an internal sliding surface on the planet gear and an external sliding surface on the pin.
    Type: Grant
    Filed: August 18, 2020
    Date of Patent: October 19, 2021
    Assignee: ROLLS-ROYCE PLC
    Inventor: Mark Spruce
  • Patent number: 11143112
    Abstract: An engine for an aircraft comprises an engine core comprising a turbine, a compressor, and a core shaft connecting the turbine to the compressor; a fan located upstream of the engine core, the fan comprising a plurality of fan blades; and a gearbox. The gearbox is an epicyclic gearbox and comprises a sun gear, a plurality of planet gears, a ring gear, and a planet carrier on which the planet gears are mounted. The radial bending stiffness of the planet carrier is equal to or greater than 1.20×109 N/m, and/or the tilt stiffness of the planet carrier is greater than or equal to 6.00×108 Nm/rad. A method of operation of such an engine is also disclosed.
    Type: Grant
    Filed: December 11, 2020
    Date of Patent: October 12, 2021
    Assignee: ROLLS-ROYCE plc
    Inventor: Mark Spruce
  • Publication number: 20210310373
    Abstract: Gearboxes for aircraft gas turbine engines, in particular to arrangements for journal bearings such gearboxes, and to related methods of operating such gearboxes and gas turbine engines. Example embodiments include a gearbox for an aircraft gas turbine engine, the gearbox including: a sun gear; a plurality of planet gears surrounding and engaged with the sun gear; and a ring gear surrounding and engaged with the plurality of planet gears, each of the plurality of planet gears being rotatably mounted around a pin of a planet gear carrier with a journal bearing having an internal sliding surface on the planet gear and an external sliding surface on the pin.
    Type: Application
    Filed: March 18, 2021
    Publication date: October 7, 2021
    Applicant: ROLLS-ROYCE plc
    Inventor: Mark SPRUCE
  • Publication number: 20210310418
    Abstract: Gearboxes for aircraft gas turbine engines, in particular arrangements for journal bearings such gearboxes, and related methods of operating such gearboxes and gas turbine engines. A gearbox for an aircraft gas turbine engine includes: a sun gear; a plurality of planet gears surrounding and engaged with the sun gear; and a ring gear surrounding and engaged with the plurality of planet gears, each of the plurality of planet gears being rotatably mounted around a pin of a planet gear carrier with a journal bearing having an internal sliding surface on the planet gear and an external sliding surface on the pin.
    Type: Application
    Filed: March 10, 2021
    Publication date: October 7, 2021
    Applicant: ROLLS-ROYCE PLC
    Inventor: Mark SPRUCE
  • Publication number: 20210310419
    Abstract: Gearboxes for aircraft gas turbine engines, in particular arrangements for journal bearings such gearboxes, and related methods of operating such gearboxes and gas turbine engines. A gearbox for an aircraft gas turbine engine includes: a sun gear; a plurality of planet gears surrounding and engaged with the sun gear; and a ring gear surrounding and engaged with the plurality of planet gears, each of the plurality of planet gears being rotatably mounted around a pin of a planet gear carrier with a journal bearing having an internal sliding surface on the planet gear and an external sliding surface on the pin.
    Type: Application
    Filed: March 10, 2021
    Publication date: October 7, 2021
    Applicant: ROLLS-ROYCE PLC
    Inventor: Mark SPRUCE
  • Publication number: 20210310420
    Abstract: Gearboxes for aircraft gas turbine engines, in particular arrangements for journal bearings such gearboxes, and related methods of operating such gearboxes and gas turbine engines, including a gearbox for an aircraft gas turbine engine, the gearbox including: a sun gear; a plurality of planet gears surrounding and engaged with the sun gear; and a ring gear surrounding and engaged with the plurality of planet gears, each of the plurality of planet gears being rotatably mounted around a pin of a planet gear carrier with a journal bearing having an internal sliding surface on the planet gear and an external sliding surface on the pin.
    Type: Application
    Filed: April 6, 2021
    Publication date: October 7, 2021
    Applicant: ROLLS-ROYCE PLC
    Inventor: Mark SPRUCE
  • Publication number: 20210310416
    Abstract: Gearboxes for aircraft gas turbine engines, in particular to arrangements for journal bearings such gearboxes, and to related methods of operating such gearboxes and gas turbine engines. Example embodiments include a gearbox for an aircraft gas turbine engine, the gearbox including: a sun gear; a plurality of planet gears surrounding and engaged with the sun gear; and a ring gear surrounding and engaged with the plurality of planet gears, each of the plurality of planet gears being rotatably mounted around a pin of a planet gear carrier with a journal bearing having an internal sliding surface on the planet gear and an external sliding surface on the pin.
    Type: Application
    Filed: August 18, 2020
    Publication date: October 7, 2021
    Applicant: ROLLS-ROYCE PLC
    Inventor: Mark SPRUCE
  • Publication number: 20210262395
    Abstract: A gas turbine engine for an aircraft includes an engine core with a turbine, a compressor, and a core shaft connecting the turbine and compressor; a fan upstream of the engine core including a plurality of fan blades; and a gearbox that receives an input from a gearbox input shaft portion of the core shaft and outputs drive to a fan shaft so as to drive the fan at a lower rotational speed than the core shaft, the gearbox being an epicyclic gearbox including a sun gear, a plurality of planet gears, a ring gear, and a planet carrier arranged to have the plurality of planet gears mounted thereon, and wherein the sun gear receives input from the core shaft. At cruise conditions the torque on the core shaft is greater than 10,000 Nm and a ratio of core shaft stiffness to core shaft torque is within a specified range.
    Type: Application
    Filed: November 30, 2020
    Publication date: August 26, 2021
    Applicant: ROLLS-ROYCE PLC
    Inventor: Mark SPRUCE
  • Publication number: 20210262396
    Abstract: An engine for an aircraft comprises an engine core comprising a turbine, a compressor, and a core shaft connecting the turbine to the compressor; a fan located upstream of the engine core, the fan comprising a plurality of fan blades; and a gearbox. The gearbox is an epicyclic gearbox and comprises a sun gear, a plurality of planet gears, a ring gear, and a planet carrier on which the planet gears are mounted. The radial bending stiffness of the planet carrier is equal to or greater than 1.20×109 N/m, and/or the tilt stiffness of the planet carrier is greater than or equal to 6.00×108 Nm/rad. A method of operation of such an engine is also disclosed.
    Type: Application
    Filed: December 11, 2020
    Publication date: August 26, 2021
    Applicant: ROLLS-ROYCE PLC
    Inventor: Mark SPRUCE
  • Patent number: 11098656
    Abstract: A gas turbine engine for an aircraft has an engine core having a turbine, compressor, and core shaft connecting the turbine and compressor; a fan upstream the engine core, the fan having fan blades; and a gearbox. The gearbox receives an input from a core shaft and outputs drive to a fan to drive the fan at a lower rotational speed than the core shaft. The gearbox is an epicyclic gearbox and has a sun gear, planet gears, ring gear, and planet carrier on which the planet gears are mounted. The gearbox has a gear mesh stiffness between the planet gears and the ring gear and a gear mesh stiffness between the planet gears and the sun gear. The gear mesh stiffness between the planet gears and the ring gear divided by that between the planet gears and the sun gear is in the range from 0.90 to 1.28.
    Type: Grant
    Filed: October 2, 2020
    Date of Patent: August 24, 2021
    Assignee: ROLLS-ROYCE plc
    Inventor: Mark Spruce
  • Publication number: 20210254555
    Abstract: An engine for an aircraft has an engine core having a turbine, a compressor, and a core shaft connecting the turbine to the compressor; a fan located upstream of the engine core, the fan having a plurality of fan blades; and a gearbox. The gearbox is arranged to receive an input from a gearbox input shaft portion of the core shaft and to output drive to the fan so as to drive the fan at a lower rotational speed than the core shaft. The gearbox is an epicyclic gearbox and has a sun gear, a plurality of planet gears, a ring gear, and a planet carrier. The planet carrier and the gearbox support each have a torsional stiffness, and a carrier to gearbox support torsional stiffness ratio is greater than or equal to 2.3.
    Type: Application
    Filed: April 29, 2021
    Publication date: August 19, 2021
    Applicant: ROLLS-ROYCE PLC
    Inventor: Mark SPRUCE
  • Patent number: 11085523
    Abstract: A planetary gearing includes a sun gear rotating about a rotation axis and driven by a sun shaft; planet gears driven by the sun gear, each planet gear having an axially forward face side and an axially rearward face side; a ring gear engaging the planet gears; and planet slide bearing pins, wherein respectively one planet slide bearing pin is arranged inside a planet gear forming a lubricated journal bearing. At an axially forward face side and/or axially rearward face side, each planet gear forms a recess that extends inside the planet gear starting from the face side, and the planet slide bearing pins respectively form one crowning at their abutment surface such that their outer diameter decreases from a maximum outer diameter to at least an axial end of the abutment surface and has a minimum at the axial end.
    Type: Grant
    Filed: November 21, 2018
    Date of Patent: August 10, 2021
    Assignees: Rolls-Royce Deutschland Ltd & Co KG, Rolls-Royce plc
    Inventors: Michael Nique, Paul Gorenz, Christopher Campbell, Frank Wagner, Mark Spruce, Daren Ashmore
  • Publication number: 20210222631
    Abstract: A gas turbine engine for an aircraft including an engine core including a turbine, compressor, and core shaft connecting the turbine and compressor; a fan located upstream of the engine core including a plurality of fan blades; a gearbox that can receive input from the core shaft and can output drive to the fan at a lower rotational speed than the core shaft, an epicyclic gearbox including a sun gear, planet gears, a ring gear, and a planet carrier on which the planet gears are mounted; and a gearbox support. A first gearbox support shear stress ratio: torsional ? ? shear ? ? stress ? ? of ? ? the ? ? gearbox ? ? support ? at ? ? maxiumum ? ? take ? ? off ? ? conditions radial ? ? bending ? ? stiffness ? ? of ? ? the ? ? gearbox ? ? support is less than or equal to 4.
    Type: Application
    Filed: October 5, 2020
    Publication date: July 22, 2021
    Applicant: ROLLS-ROYCE plc
    Inventor: Mark SPRUCE
  • Publication number: 20210172383
    Abstract: An engine for an aircraft has an engine core having a turbine, a compressor, and a core shaft connecting the turbine to the compressor; a fan located upstream of the engine core, the fan having a plurality of fan blades; and a gearbox. The gearbox for an aircraft is arranged to receive an input from a core shaft and to output drive to a fan so as to drive the fan at a lower rotational speed than the core shaft. The gearbox is an epicyclic gearbox and has a sun gear, a plurality of planet gears, a ring gear, and a planet carrier having a plurality of pins, each pin being arranged to have a planet gear of the plurality of planet gears mounted thereon. A ratio of planet carrier torsional stiffness to pin stiffness is within a specified range.
    Type: Application
    Filed: January 28, 2021
    Publication date: June 10, 2021
    Applicant: ROLLS-ROYCE plc
    Inventor: Mark SPRUCE
  • Publication number: 20210172380
    Abstract: A gas turbine engine for an aircraft has an engine core having a turbine, compressor, and core shaft connecting the turbine and compressor; a fan upstream the engine core, the fan having fan blades; and a gearbox. The gearbox receives an input from a core shaft and outputs drive to a fan to drive the fan at a lower rotational speed than the core shaft. The gearbox is an epicyclic gearbox and has a sun gear, planet gears, ring gear, and planet carrier on which the planet gears are mounted. The gearbox has a gear mesh stiffness between the planet gears and the ring gear and a gear mesh stiffness between the planet gears and the sun gear. The gear mesh stiffness between the planet gears and the ring gear divided by that between the planet gears and the sun gear is in the range from 0.90 to 1.28.
    Type: Application
    Filed: October 2, 2020
    Publication date: June 10, 2021
    Applicant: ROLLS-ROYCE PLC
    Inventor: Mark SPRUCE
  • Publication number: 20210172508
    Abstract: An engine for an aircraft has an engine core having a turbine, a compressor, and a core shaft connecting the turbine to the compressor; a fan located upstream of the engine core, the fan having fan blades; and a gearbox. The gearbox receives an input from a core shaft and outputs drive to a fan to drive the fan at a lower rotational speed than the core shaft. The gearbox is an epicyclic gearbox and has a sun gear, planet gears, a ring gear, and a planet carrier on which the planet gears are mounted, the gearbox having an overall gear mesh stiffness. The overall gear mesh stiffness of the gearbox is greater than or equal to 1.05×109 N/m. The gearbox has a gearbox diameter defined as the pitch circle diameter of the ring gear. Optionally, the gearbox diameter is in the range from 0.55 m to 1.2 m.
    Type: Application
    Filed: March 17, 2020
    Publication date: June 10, 2021
    Applicant: ROLLS-ROYCE plc
    Inventor: Mark SPRUCE