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公开(公告)号：US10934901B1
公开(公告)日：2021-03-02
申请号：US16544076
申请日：2019-08-19
申请人： Caterpillar Inc.
发明人： Ashwin A. Hattiangadi , Rong Qu
摘要： 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.
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公开(公告)号：US20200149440A1
公开(公告)日：2020-05-14
申请号：US16188547
申请日：2018-11-13
申请人： Caterpillar Inc.
发明人： Rong Qu , Ashwin Hattiangadi , Sanjay Kumar , Kevin D. Yoder
摘要： 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.
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公开(公告)号：US20170152768A1
公开(公告)日：2017-06-01
申请号：US14955826
申请日：2015-12-01
申请人： Caterpillar Inc.
发明人： Rong Qu
CPC分类号： F01L3/20 , F01L3/06 , F01L2800/10 , F01L2820/01
摘要： 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.
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4.发明申请公开(公告)号：US20200340593A1
公开(公告)日：2020-10-29
申请号：US16395944
申请日：2019-04-26
申请人： Caterpillar Inc.
发明人： Ashwin A Hattiangadi , Rong Qu , Paul Smallidge , Karen Snelling , Pay Broderson
摘要： 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.
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公开(公告)号：US10731523B2
公开(公告)日：2020-08-04
申请号：US16188547
申请日：2018-11-13
申请人： Caterpillar Inc.
发明人： Rong Qu , Ashwin Hattiangadi , Sanjay Kumar , Kevin D. Yoder
摘要： 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.
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6.发明申请公开(公告)号：US20200232353A1
公开(公告)日：2020-07-23
申请号：US16253749
申请日：2019-01-22
申请人： Caterpillar Inc.
发明人： Ashwin Hattiangadi , Rong Qu
摘要： 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.
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7.发明申请公开(公告)号：US20200149441A1
公开(公告)日：2020-05-14
申请号：US16188577
申请日：2018-11-13
申请人： Caterpillar Inc.
发明人： Ashwin Hattiangadi , Rong Qu , Sanjay Kumar , Kevin Yoder
摘要： 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.
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公开(公告)号：US10989321B2
公开(公告)日：2021-04-27
申请号：US16395944
申请日：2019-04-26
申请人： Caterpillar Inc.
发明人： Ashwin A Hattiangadi , Rong Qu , Paul Smallidge , Karen Snelling , Pay Broderson
摘要： 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.
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公开(公告)号：US10934902B1
公开(公告)日：2021-03-02
申请号：US16675852
申请日：2019-11-06
申请人： Caterpillar Inc.
发明人： Ashwin A. Hattiangadi , Abram M. Ingold , Rong Qu
摘要： 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.
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公开(公告)号：US10006317B2
公开(公告)日：2018-06-26
申请号：US14869291
申请日：2015-09-29
申请人： Caterpillar Inc.
发明人： Indrajith Kizhakkethara , Gopinath Baskaran , Ashwin A. Hattiangadi , Rong Qu , Kevin W. Redinbo
IPC分类号： F01L1/14 , F01L1/18 , F01L1/46 , F01L3/00 , F01L1/20 , F01L1/26 , F01L1/32 , F01L3/08 , F01L3/10 , F01L3/22 , F01L1/047
CPC分类号： F01L1/146 , F01L1/18 , F01L1/181 , F01L1/20 , F01L1/26 , F01L1/32 , F01L1/46 , F01L1/462 , F01L3/00 , F01L3/08 , F01L3/10 , F01L3/22 , F01L2001/054 , F01L2103/01 , F01L2105/00 , F01L2820/01
摘要： 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.
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