# US 2014/0190764 A1 · Air intake duct

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- Number: US 2014/0190764 A1
- Document ID: US20140190764A1
- Status: Published application
- Kind: A1
- Application number: 14/239,878
- Filed: 2012-08-30
- Published: 2014-07-10
- Earliest claimed: 2011-09-05
- Assignees: Roki Co., Ltd.
- Inventors: Taketoshi Matsumoto; Akira Uchiyama; Tadayuki Onoda
- Web page: https://patentgrep.com/patent/US20140190764A1

## CPC

- F01N 13/08: Other arrangements or adaptations of exhaust conduits {(pipes, joints or supports therefor in general F16L; collecting or removing exhaust gases of vehicle engines in workshops B08B15/00, on highways E01C1/005)}
- B32B 5/022: {Non-woven fabric}
- B32B 29/02: next to a fibrous or filamentary layer
- B32B 29/08: Corrugated paper or cardboard
- F02M 35/10321: {Plastics; Composites; Rubbers}
- F02M 35/1255: {using resonance}
- F02M 35/1272: {using absorbing, damping, insulating or reflecting materials, e.g. porous foams, fibres, rubbers, fabrics, coatings or membranes}
- F02M 35/1277: {Reinforcement of walls, e.g. with ribs or laminates; Walls having air gaps or additional sound damping layers}
- F02M 35/1283: {Manufacturing or assembly; Connectors; Fixations}
- B32B 2260/023: Two or more layers
- B32B 2260/046: Synthetic resin
- B32B 2307/102: Insulating
- B32B 2307/724: Permeability to gases, adsorption
- F02M 35/1288: {combined with or integrated into other devices (F02M35/14 takes precedence); Plurality of air intake silencers (F02M35/1266 takes precedence)}
- 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)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

There is provided an air intake duct capable of fully achieving intake-air noise attenuation effect. The air intake duct has a duct wall section formed of resin in form of tube and configured to introduce external air into an internal combustion engine or alternate power supply system. The duct wall section is provided with a silencing member formed of a lamination of a surface layer formed of a non-woven fabric to which thermosetting resin is impregnated and a ventilation adjusting layer formed of an extendable paper material having a surface in which a plurality of concave and convex portions are formed, and the silencing member includes at least one pair of the surface layers on front and back surfaces of at least one pair of the ventilation adjusting layers, and an intermediate layer is formed between the paired ventilation adjusting layers, the intermediate layer being formed of a same material as that of the surface layer.

## Claims

### Claim 1

An air intake duct having a duct wall section formed of resin in form of tube and configured to introduce external air into an internal combustion engine or alternate power supply system, wherein
the duct wall section is provided with a silencing member formed of a lamination of a surface layer formed of a non-woven fabric to which thermosetting resin is impregnated and a ventilation adjusting layer formed of an extendable paper material having a surface in which a plurality of concave and convex portions are formed, and
the silencing member comprises at least one pair of the surface layers on front and back surfaces of at least one pair of the ventilation adjusting layers, and an intermediate layer is formed between the paired ventilation adjusting layers, the intermediate layer being formed of a same material as that of the surface layer.

### Claim 2 (depends on 1)

The air intake duct according to claim 1, wherein the intermediate layer is bonded to the ventilation adjusting layers by means of bonding agent.

### Claim 3 (depends on 1)

The air intake duct according to claim 1, wherein the silencing member has a thickness of 1.0 to 3.0 mm.

### Claim 4 (depends on 1)

The air intake duct according to claim 1, wherein the silencing member has ventilation resistance of 1.0 to 4.0 kPa·s/m.

### Claim 5 (depends on 1)

The air intake duct according to claim 1, wherein the silencing member is located so as to close the hole portion formed to the duct wall section.

### Claim 6 (depends on 1)

The air intake duct according to claim 1, wherein the silencing member is formed by means of insert-molding to the duct wall section.