Caterpillar Inc.

Ashwin Ashok Hattiangadi

Rong Qu

Sanjay Kumar

Abram M Ingold

Charles Francis Coffey

Kevin Duane Yoder

Adam D Patrick

Paul David Smallidge

John Stephen Pipis, Jr

Edwin Henry Langewisch

Selvakumar Selvaraj

David Todd Montgomery

Jonathan Richard Chittenden

Brenton William Bush

David James Lin

Indrajith Kizhakkethara

David Andrew Cyborski

John Robert Brubaker

Jun Cai

Philip Christopher Millward

Terrence Lee Szmania

Kevin W Redinbo

Karen E Snelling

Dongyao Wang

Leo Chuzhoy

Jakub M Walczak

Adrian Vasile Catalina

Chris I Brown

Srikanth Reddy Boddapati

Uijal Paladhi

Selvaganapathi Ganesan

Pay Broderson

Alin R Olaru

Gopinath Baskaran

Abe Ingold

Vaibhav Balaji

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.

Stem seal for valve assembly of machine engine

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.

Valve seat insert with soft landing insert design with contoured radii

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.

Rocker assembly with a hydraulic lash adjuster

A valve seat insert for a gas exchange valve such as an intake 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 wear crowns to contact the gas exchange valve at different wear states. The valve seat insert is further structured by way of the inner peripheral surface with an incoming flow crown, and a venturi extending from the incoming flow crown toward a throat of the valve seat insert. The venturi accelerates incoming gas flow.

Valve seat insert for engine head having venturi flow crowns and seating surface profiled for limiting valve recession

A method for estimating damage of a component of an internal combustion engine includes receiving a fuel rate signal indicative of a fuel rate of the internal combustion engine and estimating a temperature value of the component of the internal combustion engine based on at least the received fuel rate signal. The method also includes estimating an incremental amount of damage of the component of the internal combustion engine based on the estimated temperature value of the component of the internal combustion engine, updating a cumulative amount of damage of the component of the internal combustion engine based on the estimated incremental amount of damage, and outputting a notification based on at least the cumulative amount of damage of the component of the internal combustion engine.

Method and system for estimating damage in an internal combustion engine

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.

Rocker arm assembly with air venting

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.

Lifter providing improved cam lobe lubrication

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.

Double-crowned valve seat insert having seating surface formed of hard-facing material

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.

Valve seat insert for engine having double-crowned seating surface profiled for limiting valve recession

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.

Valve seat insert for high power density and high speed diesel engines

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.

Valve seat insert for high power density and marine engines

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&#xb0; to about 35&#xb0;. The valve head contour is associated with resistance to chordal stress-induced fatigue failure.

Engine and gas exchange valve with under-head fillet contoured for chordal stress mitigation

Growing community of inventors

Edwards, IL, United States of America

Ashwin Ashok Hattiangadi