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公开(公告)号：US11125122B1
公开(公告)日：2021-09-21
申请号：US16820930
申请日：2020-03-17
申请人： Caterpillar Inc.
摘要： A valve seat insert includes a top convex arcuate blend for improving fluid flow, and a valve seating surface for slowing down valve recession. The valve seating surface includes a radially outer convex arcuate segment defining an outer radius of curvature forming a first wear crown for contacting the valve at an early wear state, a radially inner convex arcuate segment defining an inner radius of curvature forming a second wear crown for contacting the valve at a later wear state, and a linear segment extending between the radially outer convex arcuate segment and the radially inner convex arcuate segment.
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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：US10082052B2
公开(公告)日：2018-09-25
申请号：US15427865
申请日：2017-02-08
申请人： Caterpillar Inc.
CPC分类号： F01L1/2411 , F01L1/053 , F01L1/18 , F01L1/181 , F01L1/2416 , F01L1/26 , F01L1/32 , F01L1/462 , F01L2101/00 , F01L2103/00
摘要： A replaceable hydraulic lash adjuster and method for assembling such are disclosed. The replaceable hydraulic lash adjuster includes a body, a piston, a check valve and a spring. The body configured to be received in and released from a compartment of a rocker arm. The body including a sidewall surrounding a floor. The floor including a passage that extends between an upper cavity and a lower cavity of the body. The piston disposed in the lower cavity. The piston defining a pocket. A check valve is disposed inside the lower cavity and a spring is disposed inside the pocket. The replacable hydraulic lash adjuster is configured to be slidingly removeable from the rocker arm.
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公开(公告)号：US11480075B2
公开(公告)日：2022-10-25
申请号：US17343988
申请日：2021-06-10
申请人： Caterpillar Inc.
摘要： A valve seat insert includes a top convex arcuate blend for improving fluid flow, and a valve seating surface for slowing down valve recession. The valve seating surface includes a radially outer convex arcuate segment defining an outer radius of curvature forming a first wear crown for contacting the valve at an early wear state, a radially inner convex arcuate segment defining an inner radius of curvature forming a second wear crown for contacting the valve at a later wear state, and a linear segment extending between the radially outer convex arcuate segment and the radially inner convex arcuate segment.
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公开(公告)号：US11242774B2
公开(公告)日：2022-02-08
申请号：US16577171
申请日：2019-09-20
申请人： Caterpillar Inc.
摘要： A rocker assembly including a rocker shaft having an outer surface, main oil passage, a first radial passage and a second radial and a rocker arm having a first end and an inner cylindrical surface defining a bore, wherein the rocker shaft is received in the bore to pivotably mount the rocker arm onto the rocker shaft. The rocker arm includes a hydraulic lash adjuster mounted within the first end and a first oil passage having an inlet at the inner cylindrical surface and an outlet in fluid communication with the hydraulic lash adjuster. The inner cylindrical surface is spaced apart from the outer surface of the rocker shaft by a radial clearance, and wherein an inlet to the first oil passage and a first outlet of the first radial passage are in a loaded region of the radial clearance.
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公开(公告)号：US20210156285A1
公开(公告)日：2021-05-27
申请号：US16692476
申请日：2019-11-22
申请人： Caterpillar Inc.
IPC分类号： F01L1/24
摘要： A rocker arm assembly having a rocker arm with a first end defining a first cavity, a second end opposite the first end, a bore positioned between the first end and the second end for pivotally mounting the rocker arm within an engine, and an oil passage extending from the bore to the cavity. A hydraulic lash adjuster is positioned within the cavity and has an oil inlet in fluid communication with the oil passage. The rocker arm has a vent passage configured to place the oil inlet in fluid communication with an area exterior to the rocker arm.
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公开(公告)号：US11002160B2
公开(公告)日：2021-05-11
申请号：US16547713
申请日：2019-08-22
申请人： CATERPILLAR INC.
发明人： Ashwin A. Hattiangadi , John Stephen Pipis, Jr. , Charles Francis Coffey , Kevin Duane Yoder , Vaibhav Balaji
摘要： A cam follower assembly includes a cam roller, and a generally cylindrical body having an outer peripheral surface configured to be reciprocally slidable within a bore of an engine component. The cam roller is rotatably mounted on the body and configured to engage with a cam lobe on a camshaft of the engine. The cam lobe is operative to drive the body to a position at which the cam follower assembly causes one of opening of a valve or actuation of a fuel injector of the engine. A groove is formed in the body inset from the outer peripheral surface and extending axially along the outer peripheral surface parallel to the longitudinal axis of the body and aligned with an axial median plane of the cam roller and the cam lobe.
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公开(公告)号：US20210054768A1
公开(公告)日：2021-02-25
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：US11608760B2
公开(公告)日：2023-03-21
申请号：US16866095
申请日：2020-05-04
申请人： Caterpillar Inc.
摘要： A valve assembly for an engine includes a gas exchange valve, a valve guide, and a seal. The gas exchange valve includes a valve stem. The valve guide includes an outer surface having a stem seal retention surface disposed at a seal end thereof. The valve stem extends through the valve guide such that the valve is reciprocally movable over a range of travel along the longitudinal axis with respect thereto. The seal is mounted to the stem seal retention surface of the valve guide such that the seal is in running, sealing engagement with the valve stem. The stem seal retention surface includes a shoulder surface to help retain the seal.
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公开(公告)号：US20210301689A1
公开(公告)日：2021-09-30
申请号：US17343988
申请日：2021-06-10
申请人： Caterpillar Inc.
摘要： A valve seat insert includes a top convex arcuate blend for improving fluid flow, and a valve seating surface for slowing down valve recession. The valve seating surface includes a radially outer convex arcuate segment defining an outer radius of curvature forming a first wear crown for contacting the valve at an early wear state, a radially inner convex arcuate segment defining an inner radius of curvature forming a second wear crown for contacting the valve at a later wear state, and a linear segment extending between the radially outer convex arcuate segment and the radially inner convex arcuate segment.
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