CN-116529467-B - Exhaust manifold having turbine connector with turbine feet

Abstract

A turbine connector (40) in an engine exhaust manifold (30) includes turbine feet (54) attached to inlet exhaust pipes (42, 46). The turbine foot (54) has an outer peripheral edge (72) defining a trapezoidal shape and an inner peripheral edge (86, 90) forming an exhaust outlet (88, 92) from the inlet exhaust duct (42, 46). The inner peripheral edges (86, 90) have a varying peripheral curvature of maximum limited curvature magnitude on a web (94) and together form an hourglass web profile in a turbine mounting plane defined by the turbine feet (54), the web (94) extending between the exhaust outlets (88, 92).

Inventors

• M. Volcker
• ATWELL THOMAS L.
• 5. B. Shays
• JR Conyers

Assignees

• 卡特彼勒公司

Dates

Publication Date

20260505

Application Date

20211019

Priority Date

20201120

Claims (18)

1. 1. A turbine connector for an engine exhaust manifold, comprising: A turbine foot having an engine-facing side and a turbine mounting side defining a turbine mounting plane; The turbine foot also includes an outer edge having a first perimeter base, a second perimeter base, a first perimeter leg and a second perimeter leg each extending between the first perimeter base and the second perimeter base; The turbine foot also includes a first inner edge forming a first exhaust outlet opening at the turbine mounting side, a second inner edge forming a second exhaust outlet opening at the turbine mounting side, and a web extending between the first and second exhaust outlets; the first and second inner edges each have a varying peripheral curvature and together form an hourglass web profile in the turbine mounting plane, the hourglass web profile defining a first axis extending between the first and second peripheral legs and a second axis oriented orthogonal to the first axis, the varying peripheral curvature being of a maximum limited magnitude of curvature on the web, and The first and second inner edges each have a curved section on the web and a linear section opposite the respective curved section, each respective linear section being diagonally arranged with respect to the first and second axes.
2. 2. The turbine connector of claim 1, wherein the first perimeter base comprises a long perimeter base, the second perimeter base comprises a short perimeter base, and each of the first and second perimeter legs extends angularly between the first and second perimeter bases.
3. 3. The turbine connector of claim 1, wherein the first shaft comprises a primary shaft and the second shaft comprises a secondary shaft orthogonal to the first and second perimeter bases.
4. 4. The turbine connector of claim 1, wherein each respective linear segment is oriented parallel to an adjacent one of the first or second peripheral legs.
5. 5. The turbine connector of claim 4, wherein each of the first and second inner edges includes a linear segment adjacent to the first perimeter base and a linear segment adjacent to the second perimeter base.
6. 6. The turbine connector of claim 4, wherein each of the curved segments comprises a circular arc segment.
7. 7. A turbine connector, comprising: A turbine foot having an engine-facing side and a turbine mounting side opposite the engine-facing side and defining a turbine mounting plane; the turbine foot also includes an outer edge including a first perimeter base, a second perimeter base, a first perimeter leg and a second perimeter leg each extending between the first perimeter base and the second perimeter base; The turbine foot also has a plurality of bolt holes therein, including two long span bolt holes adjacent to the first perimeter base and two short span bolt holes adjacent to the second perimeter base; Defining a long span dimension between centerlines of the two long span bolt holes and a short span dimension between centerlines of the two short span bolt holes that is shorter than the long span dimension; the turbine foot also includes a first inner edge formed at a first exhaust outlet facing the turbine side opening, a second inner edge formed at a second exhaust outlet facing the turbine side opening, and a web extending between the first and second exhaust outlets; Each of the first and second inner edges includes a curved section on the web, the curved section forming an arc defining a radius-sized dimension, and Each of the long span dimension and the short span dimension is greater than the radius size dimension.
8. 8. The turbine connector of claim 7, wherein each of the two long-span bolt holes and the two short-span bolt holes is closer to the outer edge than the first inner edge or the second inner edge.
9. 9. The turbine connector of claim 7, wherein each circular arc is located on a circle intersecting one of the plurality of bolt holes.
10. 10. The turbine connector of claim 9, wherein each circle intersects one of the short span bolt holes.
11. 11. The turbine connector of claim 7, wherein the curved segments together form an hourglass web profile.
12. 12. The turbine connector of claim 7, wherein the two long-span bolt holes and the two short-span bolt holes are arranged in a trapezoidal pattern.
13. 13. The turbine connector of claim 12, wherein the trapezoidal pattern comprises an isosceles trapezoidal pattern.
14. 14. The turbine connector of claim 13, wherein each of the curved segments forms a largest radius of curvature of all radii of curvature of a respective one of the first and second inner edges.
15. 15. A turbine connector, comprising: A turbine foot including an outer edge having a first perimeter base, a second perimeter base, a first inner edge forming a first exhaust outlet, a second inner edge forming a second exhaust outlet, and a web extending between the first and second exhaust outlets, and The first and second inner edges each include a curved section on the web, a first linear section adjacent the first perimeter base, a second linear section adjacent the second perimeter base, and a third linear section opposite the respective curved section, Wherein each respective first linear segment comprises a medium length linear segment, each respective second linear segment comprises a shortest length linear segment, and each respective third linear segment comprises a longest length linear segment.
16. 16. The turbine connector of claim 15, wherein the first perimeter base comprises a long perimeter base and the second perimeter base comprises a short perimeter base.
17. 17. The turbine connector of claim 15, wherein each of the curved segments extends between a respective intermediate length linear segment and a shortest length linear segment, and each of the longest length linear segments is oriented at an angle relative to the respective intermediate length linear segment and shortest length linear segment.
18. 18. The turbine connector of claim 15, wherein the first and second exhaust outlets together define a flow area, and a ratio of the flow area to an area defined between the outer edge and each of the first and second exhaust outlets is from 0.44:1 to 0.54:1.

Description

Exhaust manifold having turbine connector with turbine feet Technical Field The present disclosure relates generally to a turbine connector for an engine exhaust manifold, and more particularly to a turbine foot shaped to resist cracking, facilitate installation, and optimize exhaust flow to a turbine in an exhaust system. Background Many modern internal combustion engines employ one or more turbochargers to extract energy from the engine exhaust and use the energy to increase the pressure of the intake air. In a typical configuration, a turbocharger is mounted to an engine exhaust manifold that collects the exhaust gas flow from the combustion cylinders of the engine and supplies the combined exhaust gas flow to the inlet of a turbine in the turbocharger. The exhaust flow through the turbine hits the blades of the turbine, causing the turbine to rotate. The shaft of the turbine extends to a compressor wheel that is fluidly positioned in the inlet stream for the intake air of the engine, or sometimes in the intake air and fumigated fuel and/or recirculated exhaust gas. Rotation of the compressor wheel increases the pressure of the intake air such that the associated internal combustion engine can operate with increased power, increased power density, and/or improved efficiency based on extraction of exhaust energy that would otherwise be wasted. The operating environment of a typical turbocharger is very demanding because the turbocharger itself and associated components can be subjected to extreme temperatures, temperature fluctuations, high absolute pressures, corrosive fluids, and an overall dynamic mechanical environment. For these reasons, turbochargers, exhaust manifolds and associated equipment are generally constructed fairly sturdy. As described above, an engine exhaust manifold typically collects exhaust gas from a plurality of cylinders and provides a turbocharger with a combined exhaust gas flow charge. The desire to limit interruptions, disturbances, or so-called "crosstalk" in the exhaust gas flow caused by cylinder-to-cylinder dynamic and rapid pressure has led many manufacturers to design the exhaust gas feed to the turbine in such a way that the exhaust gas flow from some cylinders is separated from the exhaust gas flow from other cylinders at least at the point until the exhaust gas enters the turbine housing. This arrangement requires a dividing wall or web that separates the exhaust flow at the point where the exhaust flow exits the exhaust manifold and enters the turbine housing. Relatively thin metal partition walls in the exhaust manifold castings may experience stresses and potential thermal fatigue earlier than desired over the service life of the engine. A known exhaust system having a low stress exhaust manifold flange is set forth in U.S. patent No. 6,892,532 to Bruce et al. Bruce et al propose an exhaust system in which an exhaust flange is connected to an exhaust manifold and a turbocharger is connected to the exhaust flange. The turbocharger has an exhaust inlet flange connected to an exhaust flange. The exhaust ports of the exhaust flange each have a generally triangular cross-sectional configuration. Disclosure of Invention In one aspect, a turbine connector for an engine exhaust manifold includes a first inlet exhaust conduit and a second inlet exhaust conduit. The turbine connector also includes a turbine foot attached to the first and second inlet exhaust pipes. The turbine foot includes an engine-facing side and a turbine mounting side opposite the engine-facing side and including a platform defining a turbine mounting plane. The turbine foot also includes an outer edge having a long perimeter base, a short perimeter base, and first and second perimeter legs each extending angularly between the long and short perimeter bases. The turbine foot also includes a first inner edge forming a first exhaust outlet from a first inlet exhaust duct opening in the platform, a second inner edge forming a second exhaust outlet from a second inlet exhaust duct opening in the platform, and a web extending between the first and second exhaust outlets. The first inner edge and the second inner edge each have a varying peripheral curvature that is greatest in the limited amount of curvature on the web and together form an hourglass web profile in the turbine mounting plane. In another aspect, an engine exhaust manifold includes a first exhaust pipe configured to fluidly connect to a first group of engine cylinders and a second exhaust pipe configured to fluidly connect to a second group of engine cylinders. The engine exhaust manifold also includes a turbine connector coupled to the first exhaust pipe and the second exhaust pipe and including turbine feet. The turbine foot has an outer peripheral edge defining a trapezoidal shape, a first inner peripheral edge, and a second inner peripheral edge. The first inner peripheral edge forms a first exhaust outlet for feeding exhaust gas from the f