Patents by Inventor Mark Tu

Mark Tu 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).

  • High and low spool differential gear assembly
    Patent number: 11549445
    Abstract: An example embodiment of a turbine engine assembly includes a low spool including a low spool accessory drive gear driven by a low rotor shaft, a high spool including a high spool accessory drive gear driven by a high rotor shaft concentric around a portion of the low rotor shaft, and a differential gear assembly adapted to offtake power from rotation of one or both of the low spool and the high spool to drive one or more accessory loads. The differential gear assembly includes a differential bullgear and one or more idler gears each including a plurality of teeth meshed with the low spool accessory drive gear and the high spool accessory drive gear, and a bearing surface. The differential bull gear includes a plurality of teeth and a corresponding at least one bearing surface engaging with the bearing surface of each of the one or more idler gears. The plurality of teeth are adapted to mesh with an accessory drive system to transfer the power offtake and drive the one or more accessory loads.
    Type: Grant
    Filed: March 2, 2020
    Date of Patent: January 10, 2023
    Assignee: Raytheon Technologies Corporation
    Inventor: Mark Tu
  • Multistage gas turbine engine with differential drive of compressor
    Patent number: 11448125
    Abstract: A gas turbine engine is disclosed. In various embodiments, the gas turbine engine includes a high pressure turbine having a first stage and a second stage, the first stage connected to a high pressure turbine first stage spool and the second stage connected to a high pressure turbine second stage spool; a high pressure compressor connected to a high pressure compressor spool; and a differential system having a first stage input gear connected to the high pressure turbine first stage spool, a second stage input gear connected to the high pressure turbine second stage spool and an output gear connected to the high pressure compressor spool.
    Type: Grant
    Filed: August 21, 2020
    Date of Patent: September 20, 2022
    Assignee: Raytheon Technologies Corporation
    Inventors: Daniel Bernard Kupratis, Mark Tu, Paul R Hanrahan, Arthur M. Salve, Jr.
  • Hybrid turbofan with differential electrical and mechanical power transfer
    Patent number: 11041462
    Abstract: A turbofan engine includes a fan section including a plurality of fan blades, a first spool including a first turbine section, a second spool including a second turbine section, a first electric machine, and a second electric machine. A gear system is coupled between the first spool, the second spool, the first electric machine, the second electric machine and the fan section for driving the fan section.
    Type: Grant
    Filed: June 5, 2019
    Date of Patent: June 22, 2021
    Assignee: Raytheon Technologies Corporation
    Inventors: Daniel Bernard Kupratis, Mark Tu
  • MULTISTAGE GAS TURBINE ENGINE WITH DIFFERENTIAL DRIVE OF COMPRESSOR
    Publication number: 20210054809
    Abstract: A gas turbine engine is disclosed. In various embodiments, the gas turbine engine includes a high pressure turbine having a first stage and a second stage, the first stage connected to a high pressure turbine first stage spool and the second stage connected to a high pressure turbine second stage spool; a high pressure compressor connected to a high pressure compressor spool; and a differential system having a first stage input gear connected to the high pressure turbine first stage spool, a second stage input gear connected to the high pressure turbine second stage spool and an output gear connected to the high pressure compressor spool.
    Type: Application
    Filed: August 21, 2020
    Publication date: February 25, 2021
    Applicant: RAYTHEON TECHNOLOGIES CORPORATION
    Inventors: Daniel Bernard Kupratis, Mark Tu, Paul R. Hanrahan, Arthur M. Salve, JR.
  • HYBRID TURBOFAN WITH DIFFERENTIAL ELECTRICAL AND MECHANICAL POWER TRANSFER
    Publication number: 20200386188
    Abstract: A turbofan engine includes a fan section including a plurality of fan blades, a first spool including a first turbine section, a second spool including a second turbine section, a first electric machine, and a second electric machine. A gear system is coupled between the first spool, the second spool, the first electric machine, the second electric machine and the fan section for driving the fan section.
    Type: Application
    Filed: June 5, 2019
    Publication date: December 10, 2020
    Inventors: Daniel Bernard Kupratis, Mark Tu
  • HIGH AND LOW SPOOL DIFFERENTIAL GEAR ASSEMBLY
    Publication number: 20200378310
    Abstract: An example embodiment of a turbine engine assembly includes a low spool including a low spool accessory drive gear driven by a low rotor shaft, a high spool including a high spool accessory drive gear driven by a high rotor shaft concentric around a portion of the low rotor shaft, and a differential gear assembly adapted to offtake power from rotation of one or both of the low spool and the high spool to drive one or more accessory loads. The differential gear assembly includes a differential bullgear and one or more idler gears each including a plurality of teeth meshed with the low spool accessory drive gear and the high spool accessory drive gear, and a bearing surface. The differential bull gear includes a plurality of teeth and a corresponding at least one bearing surface engaging with the bearing surface of each of the one or more idler gears. The plurality of teeth are adapted to mesh with an accessory drive system to transfer the power offtake and drive the one or more accessory loads.
    Type: Application
    Filed: March 2, 2020
    Publication date: December 3, 2020
    Inventor: Mark Tu