# US 2017/0284249 A1 · Exhaust system having hybrid cooling arrangement

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- Number: US 2017/0284249 A1
- Document ID: US20170284249A1
- Status: Published application
- Kind: A1
- Application number: 15/089,972
- Filed: 2016-04-04
- Published: 2017-10-05
- Earliest claimed: 2016-04-04
- Assignees: Caterpillar Inc.
- Applicants: Caterpillar Inc.
- Inventors: Sean Patrick OILAR
- Web page: https://patentgrep.com/patent/US20170284249A1

## CPC

- F01N 3/046: {Exhaust manifolds with cooling jacket}
- F01N 13/107: {More than one exhaust manifold or exhaust collector}
- F01N 13/1805: {Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body (pipe joints in general F16L; fixing auxiliaries in motor vehicles in general B60K)}
- F01N 13/1855: {the connection being realised by using bolts, screws, rivets or the like}
- F01P 3/20: Cooling circuits not specific to a single part of engine or machine (F01P3/22 takes precedence)
- F02B 37/025: {Multiple scrolls or multiple gas passages guiding the gas to the pump drive}
- F01N 2590/02: for marine vessels or naval applications
- F01P 2060/16: Outlet manifold
- Y02T 10/12: Improving ICE efficiencies
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- F01P: COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES (arrangements in connection with cooling of propulsion units in vehicles B60K11/00; heat-transfer, heat-exchange or heat-storage materials C09K5/00; {cooling of gas-turbine engines F02C7/12}; heat exchange in general, radiators F28)
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An exhaust system is disclosed for a use with an engine. The exhaust system may have a plurality of manifold sections, each being connected to an adjacent one of the plurality of manifold sections and thereby forming an exhaust manifold. The exhaust system may also have a plurality of elbow-shaped coolant adapters, each being configured to connect a corresponding one of the plurality of manifold sections to a corresponding cylinder head of the engine and having a coolant jacket formed therein. The exhaust system may further have a heat shield formed around the exhaust manifold.

## Claims

### Claim 1

A coolant adapter for an engine, comprising:
an elbow-shaped conduit having an exhaust inlet connectable to a cylinder head of the engine and an exhaust outlet connectable to an exhaust manifold of the engine; and
a jacket formed around at least a portion of the elbow-shaped conduit.

### Claim 2 (depends on 1)

The coolant adapter of claim 1, wherein axes of the exhaust inlet and outlet are oriented at an interior angle of about 60-120° relative to each other

### Claim 3 (depends on 2)

The coolant adapter of claim 2, wherein the interior angle is about 90°.

### Claim 4 (depends on 1)

The coolant adapter of claim 1, wherein the jacket includes a coolant inlet having an axis generally parallel with an axis of the exhaust inlet.

### Claim 5 (depends on 4)

The coolant adapter of claim 4, wherein the coolant inlet is formed within an outboard side wall of the jacket and connectable with a coolant supply in the cylinder head.

### Claim 6 (depends on 4)

The coolant adapter of claim 4, wherein the jacket further includes a coolant outlet having an axis generally orthogonal to axes of both the exhaust inlet and outlet.

### Claim 7 (depends on 4)

The coolant adapter of claim 4, further including a mounting flange located at a downstream end of the elbow-shaped conduit, the mounting flange having:
the exhaust outlet centrally located therein; and
a concentric coolant outlet in communication with the jacket.

### Claim 8

An exhaust system for an engine, comprising:
a plurality of manifold sections, each being connected to an adjacent one of the plurality of manifold sections and thereby forming an exhaust manifold;
a plurality of elbow-shaped coolant adapters, each being configured to connect a corresponding one of the plurality of manifold sections to a corresponding cylinder head of the engine and having a coolant jacket formed therein; and
a heat shield formed around the exhaust manifold.

### Claim 9 (depends on 8)

The exhaust system of claim 8, wherein:
the coolant jacket is a first coolant jacket; and
each of the plurality of manifold sections includes a second coolant jacket formed therein that is in fluid communication with the first coolant jacket.

### Claim 10 (depends on 8)

The exhaust system of claim 8, further including a coolant manifold configured to receive coolant from the coolant jacket via an inboard side of each of the plurality of elbow-shaped coolant adapters.

### Claim 11 (depends on 8)

The exhaust system of claim 8, further including a coupling configured to direct coolant from the corresponding cylinder head into the coolant jacket via an outboard side of each of the plurality of elbow-shaped coolant adapters.

### Claim 12 (depends on 8)

The exhaust system of claim 8, wherein each of the plurality of elbow-shaped coolant adapters has an interior angle of about 90°.

### Claim 13 (depends on 8)

The exhaust system of claim 8, wherein the coolant jacket includes a coolant inlet having an axis generally parallel with an exhaust inlet of each of the plurality of elbow-shaped coolant adapters.

### Claim 14 (depends on 8)

The exhaust system of claim 8, further including an exhaust runner connecting each of the plurality of manifold sections to each of the plurality of elbow-shaped coolant adapters.

### Claim 15 (depends on 8)

The exhaust system of claim 8, wherein each of the plurality of elbow-shaped coolant adapters further includes a first mounting flange located at an end thereof and configured to engage a corresponding second mounting flange on each of the plurality of manifold sections, the first mounting flange having:
an exhaust outlet centrally located therein; and
a concentric coolant outlet formed around the exhaust outlet.

### Claim 16 (depends on 15)

The exhaust system of claim 15, wherein the heat shield is supported by at least one of the first and second mounting flanges.

### Claim 17 (depends on 16)

The exhaust system of claim 16, wherein the heat shield encompasses the exhaust manifold on at least three sides.

### Claim 18 (depends on 16)

The exhaust system of claim 16, wherein the heat shield encompasses the exhaust manifold on four sides.

### Claim 19

A power system, comprising:
an engine having a plurality of cylinder heads;
a plurality of manifold sections configured to connect with each other and thereby form an exhaust manifold, each of the plurality of manifold sections having an integral exhaust runner extending from an annular wall;
a plurality of a coolant adapters, each configured to connect a corresponding integral exhaust runner to a corresponding one of the plurality of cylinder heads, and having a jacket formed therein;
a plurality of couplings, each configured to connect a coolant outlet of the corresponding one of the plurality of cylinder heads with the jacket via an outboard side of a corresponding one of the plurality of coolant adapters;
a coolant manifold configured to receive coolant from the plurality of coolant adapters via an inboard side of each of the plurality of coolant adapters;
a heat shield formed around the exhaust manifold; and
a turbocharger driven by exhaust in the exhaust manifold to pressurize air directed into the engine.

### Claim 20 (depends on 19)

The power system of claim 19, wherein:
the heat shield is supported by the plurality of a coolant adapters; and
the heat shield encompasses the exhaust manifold on at least three sides.