Patents by Inventor Rong Qu

Rong Qu 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).

  • Patent number: 11022009
    Abstract: A hydraulic lash adjuster includes a longitudinally extending pushrod having a proximal end and a distal end, and a cavity located at the distal end and a piston received in the cavity. The piston includes an internal reservoir and a fluid pathway to the internal reservoir. The fluid pathway includes a longitudinal passage and a radial passage.
    Type: Grant
    Filed: January 18, 2019
    Date of Patent: June 1, 2021
    Assignee: Caterpillar Inc.
    Inventors: Rong Qu, Charles F. Coffey
  • Patent number: 10989321
    Abstract: A valve seat insert for a gas exchange valve controlling gas exchange of a cylinder includes an insert body having an inner peripheral surface, an outer peripheral surface, and a valve seating surface structured to contact the gas exchange valve at a closed position and profiled to limit valve recession thereof. The valve seating surface includes an arrangement of linear segments and curved segments forming crowns to contact the gas exchange valve at different wear states. The valve seat insert further includes a base material, and a hard-facing material metallurgically bonded to the base material and forming the valve seating surface.
    Type: Grant
    Filed: April 26, 2019
    Date of Patent: April 27, 2021
    Assignee: Caterpillar Inc.
    Inventors: Ashwin A Hattiangadi, Rong Qu, Paul Smallidge, Karen Snelling, Pay Broderson
  • Patent number: 10934902
    Abstract: A valve seat insert of an engine has a valve seating surface including an outer curved segment forming a first wear crown for contacting the valve at an early wear state, an inner curved segment forming a second wear crown for contacting the valve at a later wear state, and a linear segment extending between the outer and the inner curved segments. A sloping segment is oriented at an acute angle relative to the valve seat center axis, forming a venturi or a diffuser for gases entering or exiting the cylinder.
    Type: Grant
    Filed: November 6, 2019
    Date of Patent: March 2, 2021
    Assignee: Caterpillar Inc.
    Inventors: Ashwin A. Hattiangadi, Abram M. Ingold, Rong Qu
  • Patent number: 10934899
    Abstract: A valve seat insert for a gas exchange valve controlling gas exchange of a cylinder includes an insert body having an inner peripheral surface, an outer peripheral surface, and a valve seating surface structured to contact the gas exchange valve at a closed position and profiled to limit valve recession thereof. The valve seating surface includes an arrangement of linear segments and curved segments forming crowns to contact the gas exchange valve at different wear states.
    Type: Grant
    Filed: November 13, 2018
    Date of Patent: March 2, 2021
    Assignee: Caterpillar Inc.
    Inventors: Ashwin Hattiangadi, Rong Qu, Sanjay Kumar, Kevin Yoder
  • Patent number: 10934901
    Abstract: A valve seat insert of an engine has a valve seating surface including an outer curved segment forming a first wear crown for contacting the valve at an early wear state, an inner curved segment forming a second wear crown for contacting the valve at a later wear state, and a linear segment extending between the outer and the inner curved segments.
    Type: Grant
    Filed: August 19, 2019
    Date of Patent: March 2, 2021
    Assignee: Caterpillar Inc.
    Inventors: Ashwin A. Hattiangadi, Rong Qu
  • Publication number: 20210054768
    Abstract: A valve seat insert of an engine has a valve seating surface including an outer curved segment forming a first wear crown for contacting the valve at an early wear state, an inner curved segment forming a second wear crown for contacting the valve at a later wear state, and a linear segment extending between the outer and the inner curved segments.
    Type: Application
    Filed: August 19, 2019
    Publication date: February 25, 2021
    Applicant: Caterpillar Inc.
    Inventors: Ashwin A. Hattiangadi, Rong Qu
  • Patent number: 10844758
    Abstract: A gas exchange valve in an internal combustion engine includes a valve head having a sealing face structured to contact a valve seat and defining a face angle. The valve head further includes an under-head fillet transitioning from the inner sealing face to a valve stem, and defining a chordal stress zone within the under-head fillet. The under-head fillet is formed by a material distributed according to a stress-diffusing contour within the chordal stress zone, and is blended with the inner sealing face at a blend angle that is less than the face angle and is in a range of about 18° to about 35°. The valve head contour is associated with resistance to chordal stress-induced fatigue failure.
    Type: Grant
    Filed: January 22, 2019
    Date of Patent: November 24, 2020
    Assignee: Caterpillar Inc.
    Inventors: Ashwin Hattiangadi, Rong Qu
  • Publication number: 20200340593
    Abstract: A valve seat insert for a gas exchange valve controlling gas exchange of a cylinder includes an insert body having an inner peripheral surface, an outer peripheral surface, and a valve seating surface structured to contact the gas exchange valve at a closed position and profiled to limit valve recession thereof. The valve seating surface includes an arrangement of linear segments and curved segments forming crowns to contact the gas exchange valve at different wear states. The valve seat insert further includes a base material, and a hard-facing material metallurgically bonded to the base material and forming the valve seating surface.
    Type: Application
    Filed: April 26, 2019
    Publication date: October 29, 2020
    Applicant: Caterpillar Inc.
    Inventors: Ashwin A Hattiangadi, Rong Qu, Paul Smallidge, Karen Snelling, Pay Broderson
  • Patent number: 10767520
    Abstract: A valve seat insert of an engine has a valve seating surface including an outer curved segment forming a first wear crown for contacting the valve at an early wear state, an inner curved segment forming a second wear crown for contacting the valve at a later wear state, and a linear segment extending between the outer and the inner curved segments. A top flow crown is set off radially inward from the engine head, and a sloping segment extending from the top flow crown is oriented at an acute angle relative to the valve seat center axis.
    Type: Grant
    Filed: August 19, 2019
    Date of Patent: September 8, 2020
    Assignee: Caterpillar Inc.
    Inventors: Ashwin A. Hattiangadi, Paul David Smallidge, Rong Qu
  • Patent number: 10760455
    Abstract: A poppet valve has an elongated stem that is configured to extend along a longitudinal axis. The poppet valve further includes a valve body that is disposed laterally with respect to the longitudinal axis and located in a spaced apart relation with an end of the elongated stem. The valve body has a pair of opposing faces disposed co-axial with the longitudinal axis of the elongated stem. The poppet valve also includes at least two arcuately shaped appendages depending downwardly from the end of the elongated stem and extending away from the longitudinal axis of the elongated stem. An end of each appendage is disposed in abutment with an annular region defined on one of the opposing faces of the valve body, a perimeter of the annular region being larger than a perimeter of the elongated stem measured about the longitudinal axis.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: September 1, 2020
    Assignee: Caterpillar Inc.
    Inventors: Mark D. Veliz, Rong Qu, Arun Lal Gain, Walter Sherman Isenberg, Rui Yuan, Thierry Andre Marchione
  • Patent number: 10731523
    Abstract: An internal combustion engine includes a valve seat insert within an engine housing, and a gas exchange valve. The valve seat insert has a compound valve seat with a valve recession-resistive profile formed by a leading radius contacted by the valve seat at an early wear state of the valve head and valve seat insert, a trailing radius contacted by the valve head at a later wear state of the valve head and valve seat insert, and an outer seat face. The compound valve seat is shaped and proportioned to cushion contact by a gas exchange valve and retard valve recession.
    Type: Grant
    Filed: November 13, 2018
    Date of Patent: August 4, 2020
    Assignee: Caterpillar Inc.
    Inventors: Rong Qu, Ashwin Hattiangadi, Sanjay Kumar, Kevin D. Yoder
  • Publication number: 20200232350
    Abstract: A hydraulic lash adjuster includes a longitudinally extending pushrod having a proximal end and a distal end, and a cavity located at the distal end and a piston received in the cavity. The piston includes an internal reservoir and a fluid pathway to the internal reservoir. The fluid pathway includes a longitudinal passage and a radial passage.
    Type: Application
    Filed: January 18, 2019
    Publication date: July 23, 2020
    Applicant: Caterpillar Inc.
    Inventors: Rong QU, Charles F. COFFEY
  • Publication number: 20200232353
    Abstract: A gas exchange valve in an internal combustion engine includes a valve head having a sealing face structured to contact a valve seat and defining a face angle. The valve head further includes an under-head fillet transitioning from the inner sealing face to a valve stem, and defining a chordal stress zone within the under-head fillet. The under-head fillet is formed by a material distributed according to a stress-diffusing contour within the chordal stress zone, and is blended with the inner sealing face at a blend angle that is less than the face angle and is in a range of about 18° to about 35°. The valve head contour is associated with resistance to chordal stress-induced fatigue failure.
    Type: Application
    Filed: January 22, 2019
    Publication date: July 23, 2020
    Applicant: Caterpillar Inc.
    Inventors: Ashwin Hattiangadi, Rong Qu
  • Publication number: 20200149440
    Abstract: An internal combustion engine includes a valve seat insert within an engine housing, and a gas exchange valve. The valve seat insert has a compound valve seat with a valve recession-resistive profile formed by a leading radius contacted by the valve seat at an early wear state of the valve head and valve seat insert, a trailing radius contacted by the valve head at a later wear state of the valve head and valve seat insert, and an outer seat face. The compound valve seat is shaped and proportioned to cushion contact by a gas exchange valve and retard valve recession.
    Type: Application
    Filed: November 13, 2018
    Publication date: May 14, 2020
    Applicant: Caterpillar Inc.
    Inventors: Rong Qu, Ashwin Hattiangadi, Sanjay Kumar, Kevin D. Yoder
  • Publication number: 20200149441
    Abstract: A valve seat insert for a gas exchange valve controlling gas exchange of a cylinder includes an insert body having an inner peripheral surface, an outer peripheral surface, and a valve seating surface structured to contact the gas exchange valve at a closed position and profiled to limit valve recession thereof. The valve seating surface includes an arrangement of linear segments and curved segments forming crowns to contact the gas exchange valve at different wear states.
    Type: Application
    Filed: November 13, 2018
    Publication date: May 14, 2020
    Applicant: Caterpillar Inc.
    Inventors: Ashwin Hattiangadi, Rong Qu, Sanjay Kumar, Kevin Yoder
  • Patent number: 10006317
    Abstract: A valve actuation system is disclosed for use with an internal combustion engine. The valve actuation system may have a rocker shaft, a rocker arm pivotally mounted on the rocker shaft, at least one cam follower and a pushrod connecting the at least one cam follower to the rocker arm. The valve actuation system may also have a plurality of gas exchange valves, and a bridge connecting the rocker arm to the valves. The valve actuation system may further have at least one spring disposed around each of the valves and configured to bias each of the valves toward closed positions, and a rotocoil configured to rotatably connect the at least one spring to each of the valves. The rotocoil may have an internal chamfer at a bridge end with an angle of about 26-28°. The at least one spring may have an assembled load of about 750-850 N.
    Type: Grant
    Filed: September 29, 2015
    Date of Patent: June 26, 2018
    Assignee: Caterpillar Inc.
    Inventors: Indrajith Kizhakkethara, Gopinath Baskaran, Ashwin A. Hattiangadi, Rong Qu, Kevin W. Redinbo
  • Publication number: 20180171837
    Abstract: A poppet valve has an elongated stem that is configured to extend along a longitudinal axis. The poppet valve further includes a valve body that is disposed laterally with respect to the longitudinal axis and located in a spaced apart relation with an end of the elongated stem. The valve body has a pair of opposing faces disposed co-axial with the longitudinal axis of the elongated stem. The poppet valve also includes at least two arcuately shaped appendages depending downwardly from the end of the elongated stem and extending away from the longitudinal axis of the elongated stem. An end of each appendage is disposed in abutment with an annular region defined on one of the opposing faces of the valve body, a perimeter of the annular region being larger than a perimeter of the elongated stem measured about the longitudinal axis.
    Type: Application
    Filed: December 20, 2016
    Publication date: June 21, 2018
    Applicant: Caterpillar Inc.
    Inventors: Mark D. Veliz, Rong Qu, Arun Lai Gain, Walter Sherman Isenberg, Rui YUan, Thierry Andre Marchione
  • Patent number: 9879575
    Abstract: A system for lubricating a valve assembly of an engine. The system includes a valve bridge having a base portion is disposed on a guide rod. The guide rod is received within a hole defined in the base portion of the valve bridge to define a chamber and to receive lubricant in the chamber. The valve bridge includes an arm that is engaged with a valve stem. The valve bridge includes a passage in fluidly communicating with the chamber and an end of the arm. The system includes a valve disposed around the valve stem and valve stem guide. The valve seal includes a lip member that abuts an outer surface of the valve stem to control a flow of the lubricant from the passage to a gap defined between the valve stem and the valve stem guide.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: January 30, 2018
    Assignee: Caterpillar Inc.
    Inventors: Douglas D. Erdman, Michael D. Roley, Rong Qu
  • Patent number: 9720960
    Abstract: A view schema is generated from a view definition, wherein the view schema includes one or more relational views that are created by translating one or more object queries in the view definition into one or more relational queries. A report design schema is generated from the view definition by: creating one or more report tables that correspond to the one or more relational views of the view schema and extending the one or more report tables with one or more primary key constraints and one or more foreign key constraints. A reporting model is generated by reverse engineering the report design schema, wherein the reporting model includes the one or more primary key constraints and the one or more foreign key constraints. A report is generated using the reporting model, wherein the report includes the one or more primary key constraints and the one or more foreign key constraints.
    Type: Grant
    Filed: June 6, 2014
    Date of Patent: August 1, 2017
    Assignee: International Business Machines Corporation
    Inventors: Cassio S. Dos Santos, Kunjavihari M. Kashalikar, Jean-Claude Mamou, Kishore Patel, Rong Qu, Hong X. Zhang
  • Publication number: 20170152768
    Abstract: A valve for use in an internal combustion engine is provided. The valve includes a valve head. The valve head includes a combustion face configured to face a combustion chamber of the internal combustion engine. The combustion face includes an angular side portion. The combustion face also includes a central recess portion defining an inner diameter and an outer diameter. The inner diameter and the outer diameter together define a depth of the central recess portion. The valve also includes a neck portion configured to connect the valve head with a valve stem of the valve.
    Type: Application
    Filed: December 1, 2015
    Publication date: June 1, 2017
    Applicant: Caterpillar Inc.
    Inventor: Rong Qu