# US 10,309,283 B2 · Exhaust device of engine

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- Number: US 10,309,283 B2
- Document ID: US10309283B2
- Status: Granted
- Kind: B2
- Application number: 15/617,961
- Filed: 2017-06-08
- Published: 2017-12-21
- Granted: 2019-06-04
- Earliest claimed: 2016-06-20
- Assignees: Mazda Motor Corporation
- Applicants: Mazda Motor Corporation
- Inventors: Yasushi Niwa; Kazuya Niida
- Web page: https://patentgrep.com/patent/US10309283B2

## CPC

- F01N 3/2839: {Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration}
- F01N 3/046: {Exhaust manifolds with cooling jacket}
- F01N 13/10: of exhaust manifolds {(with cooling jacket F01N3/046)}
- F01N 13/14: having thermal insulation {(exhaust manifolds F01N13/102)}
- 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)}
- 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)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An exhaust device of an engine is provided, which includes an exhaust port formed in a cylinder head and connected to an exhaust aperture of a cylinder, an exhaust manifold disposed on a side surface of the cylinder head and formed with a first exhaust passage, an exhaust path constituting part disposed on a side of the exhaust manifold opposite from the cylinder head, and formed with a second exhaust passage, a catalyst disposed on a downstream side of the exhaust path constituting part, an upstream gasket disposed between the side surface of the cylinder head and an upstream connecting member of the manifold, and a downstream gasket disposed between a downstream connecting member of the manifold and an exhaust-manifold-side connecting member of the exhaust path constituting part. The upstream gasket has a larger thermal resistance in an exhaust gas flow direction than the downstream gasket.

## Claims

### Claim 1

An exhaust device of an engine, comprising:
an exhaust port formed in a cylinder head and connected to an exhaust aperture of a cylinder at a first open end;
an exhaust manifold disposed on a side surface of the cylinder head and formed with a first exhaust passage connected to a second open end of the exhaust port opposite from the first open end;
an exhaust path constituting part disposed on a side of the exhaust manifold opposite from the cylinder head, and formed with a second exhaust passage connected to a downstream end of the first exhaust passage;
an exhaust gas purifying catalyst device disposed on a downstream side of the exhaust path constituting part;
an upstream gasket disposed between the side surface of the cylinder head and an upstream connecting member of the exhaust manifold;
a downstream gasket disposed between a downstream connecting member of the exhaust manifold and an exhaust-manifold-side connecting member of the exhaust path constituting part, the upstream gasket having a larger thermal resistance in an exhaust gas flow direction than the downstream gasket, wherein
the upstream gasket includes a plurality of upstream seal plates stacked in a direction parallel to the exhaust gas flow direction, each of the plurality of upstream seal plates being formed with a through-hole to form a third exhaust passage therein,
the downstream gasket includes a plurality of downstream seal plates stacked in a direction parallel to the exhaust gas flow direction, each of the plurality of downstream seal plates being formed with a through-hole to form the third exhaust passage therein,
the plurality of upstream seal plates and the plurality of downstream seal plates are made from substantially the same materials and have substantially the same thicknesses, and
a number of the plurality of upstream seal plates is larger than a number of the plurality of downstream seal plates.

### Claim 2 (depends on 1)

The device of claim 1, wherein
the upstream and downstream gaskets are made from substantially the same materials, and
the upstream gasket is thicker than the downstream gasket in the exhaust gas flow direction.

### Claim 3 (depends on 1)

The device of claim 1, wherein
the downstream gasket includes a grommet plate disposed between two of the plurality of downstream seal plates,
the grommet plate is formed with a passage hole forming the third exhaust passage together with the through-holes of the plurality of downstream seal plates, and
the grommet plate is provided with a folded portion formed at a passage hole side by folding the grommet plate to cover an inner circumferential portion of one downstream seal plate adjacent to the grommet plate, the inner circumferential portion forming the through-hole.

### Claim 4 (depends on 1)

The device of claim 1, wherein the upstream gasket includes an insulator plate having an extended portion extending outwardly of the upstream gasket and disposed between two of the plurality of upstream seal plates.