Valve seat insert with soft landing insert design with contoured radii
AssigneeCaterpillar Inc.
InventorsAshwin A. Hattiangadi, Abram M. Ingold, Sanjay Kumar, Adam D. Patrick
Life of this patent
Estimating the term…
Abstract
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.
Claims20
An engine head assembly for an internal combustion engine comprising:
- an engine head having a fluid conduit formed therein;
- a valve;
- a valve seat insert positioned at least partially within the engine head, and the valve seat insert including
- an at least partially annular body, defining a longitudinal axis, and a radial direction that is perpendicular to the longitudinal axis, a first axial end surface disposed proximate to the engine head, and a second axial end surface;
- a radially inner surface forming a throat, a radially outer peripheral surface defining a cooling gallery, and a valve seating surface disposed axially and radially between the radially inner surface and the second axial end surface;
- and
- a top convex arcuate blend extending from the first axial end surface to the radially inner surface;
- wherein in a plane containing the longitudinal axis and the radial direction, 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 such that the radially outer convex arcuate segment is spaced radially and axially away from the radially inner convex arcuate segment.
A valve seat insert for a valve in an internal combustion engine comprising:
- an annular body defining a valve seat cylindrical axis, and a radial direction that is perpendicular to the valve seat cylindrical axis, a first axial end surface, and a second axial end surface;
- the annular body further having a radially inner surface defining a throat, a radially outer peripheral surface defining a cooling gallery, and a valve seating surface extending between the radially inner surface and the second axial end surface;
- and
- a top convex arcuate blend extending from the first axial end surface to the radially inner surface;
- wherein the valve seating surface includes in a plane containing the valve seat cylindrical axis and the radial direction, a radially outer convex arcuate segment forming a first wear crown, a radially inner convex arcuate segment forming a second wear crown, and a linear segment extending between the radially outer convex arcuate segment and the radially inner convex arcuate segment such that the radially outer arcuate segment is spaced radially and axially away from the radially convex arcuate segment.
A valve seat insert for a valve in an internal combustion engine comprising:
- an annular body defining a valve seat cylindrical axis, and a radial direction that is perpendicular to the valve seat cylindrical axis, a first axial end surface, and a second axial end surface;
- the annular body further having radially inner surface defining a throat, a radially outer peripheral surface defining a cooling gallery, and a valve seating surface extending between the radially inner surface and the second axial end surface;
- and
- a top convex arcuate blend surface extending from the first axial end surface to the radially inner surface;
- wherein the valve seating surface includes in a plane containing the valve seat cylindrical axis and the radial direction, a radially outer convex arcuate segment forming a first wear crown, a radially inner convex arcuate segment forming a second wear crown, a linear segment extending axially and radially between the radially outer convex arcuate segment and the radially inner convex arcuate segment defining a break-in contact width, the top convex arcuate blend surface defines a top radius of curvature, and the radially outer convex arcuate segment defines a radially outer convex radius of curvature that is greater than the top radius of curvature.
Dependencies are inferred from the claim text.