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).
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Patent number: 11685972Abstract: The present disclosure provides a Ni-based alloy and a valve made of the same. The Ni-based alloy includes, on a weight basis: about 14%-17% Cr, about 4%-6% Al, about 1.0%-1.5% Ti, about 8%-11% Co, about 6%-9% W, about 0.5%-1.5% Ta, no more than about 0.25% Fe, about 0-2.0% Mo, about 0.07%-0.18% C, about 0.01%-0.03% Zr, about 0.005%-0.015% B, a balance of Ni, and incidental impurities. The Ni-based alloy, when used to fabricate engine valves, may significantly improve the corrosion resistance and oxidation resistance of the engine vales. The engine valves may also possess other desirable properties, such as high fatigue strength, high tensile strength and good weldability. The engine valves may also have extended useable life. The cost for manufacturing such engine valves may also be reduced.Type: GrantFiled: November 15, 2021Date of Patent: June 27, 2023Assignee: HUAIJI VALVE USA INCInventor: Rong Qu
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Publication number: 20220154312Abstract: The present disclosure provides a Ni-based alloy and a valve made of the same. The Ni-based alloy includes, on a weight basis: about 14%-17% Cr, about 4%-6% Al, about 1.0%-1.5% Ti, about 8%-11% Co, about 6%-9% W, about 0.5%-1.5% Ta, no more than about 0.25% Fe, about 0-2.0% Mo, about 0.07%-0.18% C, about 0.01%-0.03% Zr, about 0.005%-0.015% B, a balance of Ni, and incidental impurities. The Ni-based alloy, when used to fabricate engine valves, may significantly improve the corrosion resistance and oxidation resistance of the engine vales. The engine valves may also possess other desirable properties, such as high fatigue strength, high tensile strength and good weldability. The engine valves may also have extended useable life. The cost for manufacturing such engine valves may also be reduced.Type: ApplicationFiled: November 15, 2021Publication date: May 19, 2022Applicant: Huaiji Valve USA IncInventor: Rong QU
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Patent number: 11022009Abstract: 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: GrantFiled: January 18, 2019Date of Patent: June 1, 2021Assignee: Caterpillar Inc.Inventors: Rong Qu, Charles F. Coffey
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Patent number: 10989321Abstract: 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: GrantFiled: April 26, 2019Date of Patent: April 27, 2021Assignee: Caterpillar Inc.Inventors: Ashwin A Hattiangadi, Rong Qu, Paul Smallidge, Karen Snelling, Pay Broderson
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Patent number: 10934902Abstract: 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: GrantFiled: November 6, 2019Date of Patent: March 2, 2021Assignee: Caterpillar Inc.Inventors: Ashwin A. Hattiangadi, Abram M. Ingold, Rong Qu
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Patent number: 10934901Abstract: 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: GrantFiled: August 19, 2019Date of Patent: March 2, 2021Assignee: Caterpillar Inc.Inventors: Ashwin A. Hattiangadi, Rong Qu
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Patent number: 10934899Abstract: 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: GrantFiled: November 13, 2018Date of Patent: March 2, 2021Assignee: Caterpillar Inc.Inventors: Ashwin Hattiangadi, Rong Qu, Sanjay Kumar, Kevin Yoder
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Publication number: 20210054768Abstract: 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: ApplicationFiled: August 19, 2019Publication date: February 25, 2021Applicant: Caterpillar Inc.Inventors: Ashwin A. Hattiangadi, Rong Qu
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Patent number: 10844758Abstract: 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: GrantFiled: January 22, 2019Date of Patent: November 24, 2020Assignee: Caterpillar Inc.Inventors: Ashwin Hattiangadi, Rong Qu
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Publication number: 20200340593Abstract: 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: ApplicationFiled: April 26, 2019Publication date: October 29, 2020Applicant: Caterpillar Inc.Inventors: Ashwin A Hattiangadi, Rong Qu, Paul Smallidge, Karen Snelling, Pay Broderson
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Patent number: 10767520Abstract: 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: GrantFiled: August 19, 2019Date of Patent: September 8, 2020Assignee: Caterpillar Inc.Inventors: Ashwin A. Hattiangadi, Paul David Smallidge, Rong Qu
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Patent number: 10760455Abstract: 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: GrantFiled: December 20, 2016Date of Patent: September 1, 2020Assignee: Caterpillar Inc.Inventors: Mark D. Veliz, Rong Qu, Arun Lal Gain, Walter Sherman Isenberg, Rui Yuan, Thierry Andre Marchione
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Patent number: 10731523Abstract: 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: GrantFiled: November 13, 2018Date of Patent: August 4, 2020Assignee: Caterpillar Inc.Inventors: Rong Qu, Ashwin Hattiangadi, Sanjay Kumar, Kevin D. Yoder
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Publication number: 20200232350Abstract: 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: ApplicationFiled: January 18, 2019Publication date: July 23, 2020Applicant: Caterpillar Inc.Inventors: Rong QU, Charles F. COFFEY
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Publication number: 20200232353Abstract: 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: ApplicationFiled: January 22, 2019Publication date: July 23, 2020Applicant: Caterpillar Inc.Inventors: Ashwin Hattiangadi, Rong Qu
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Publication number: 20200149441Abstract: 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: ApplicationFiled: November 13, 2018Publication date: May 14, 2020Applicant: Caterpillar Inc.Inventors: Ashwin Hattiangadi, Rong Qu, Sanjay Kumar, Kevin Yoder
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Publication number: 20200149440Abstract: 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: ApplicationFiled: November 13, 2018Publication date: May 14, 2020Applicant: Caterpillar Inc.Inventors: Rong Qu, Ashwin Hattiangadi, Sanjay Kumar, Kevin D. Yoder
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Patent number: 10006317Abstract: 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: GrantFiled: September 29, 2015Date of Patent: June 26, 2018Assignee: Caterpillar Inc.Inventors: Indrajith Kizhakkethara, Gopinath Baskaran, Ashwin A. Hattiangadi, Rong Qu, Kevin W. Redinbo
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Publication number: 20180171837Abstract: 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: ApplicationFiled: December 20, 2016Publication date: June 21, 2018Applicant: Caterpillar Inc.Inventors: Mark D. Veliz, Rong Qu, Arun Lai Gain, Walter Sherman Isenberg, Rui YUan, Thierry Andre Marchione
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Patent number: 9879575Abstract: 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: GrantFiled: June 8, 2016Date of Patent: January 30, 2018Assignee: Caterpillar Inc.Inventors: Douglas D. Erdman, Michael D. Roley, Rong Qu