Air cleaner for internal combustion engine

Patent metadata

Field	Value
Publication number	US-10458376-B2
Application number	US-201715491316-A
Country	US
Kind code	B2
Filing date	Apr 19, 2017
Priority date	May 9, 2016
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

An air cleaner for an internal combustion engine includes a first housing having an inlet and an upper opening, a second housing having an outlet and a lower opening, a filter element arranged between the upper opening of the first housing and the lower opening of the second housing. The first housing includes a sound reducing wall portion. The sound reducing wall portion has a sound absorbing layer, which is made of nonwoven fabric, and an inner covering layer, which is fixed to the inner surface of the sound absorbing layer and made of a material having a lower air permeability than that of the sound absorbing layer.

First claim

The invention claimed is:

1. An air cleaner for an internal combustion engine, comprising:
a first housing including an inlet and an opening;
a second housing including an outlet and an opening; and
a filter element arranged between the opening of the first housing and the opening of the second housing, wherein
at least one of the first housing and the second housing includes a sound reducing wall portion, and
the sound reducing wall portion includes
a sound absorbing layer made of an air permeable material, and
an inner covering layer, which is fixed to an inner surface of the sound absorbing layer and made of a material having a lower air permeability than that of the sound absorbing layer.

2. The air cleaner for an internal combustion engine according to claim 1 , wherein an air permeability of the inner covering layer is 3 cm 3 /cm 2 -s to 50 cm 3 /cm 2 -s.

3. The air cleaner for an internal combustion engine according to claim 1 , wherein the air permeable material is a nonwoven fabric.

4. The air cleaner for an internal combustion engine according to claim 1 , wherein
of the first housing and the second housing, the housing including the sound reducing wall portion includes a molded plastic portion, which constitutes at least one of the inlet, the outlet, and a flange that forms a periphery of the opening, and
the molded plastic portion is integrally formed with the sound reducing wall portion.

5. The air cleaner for an internal combustion engine according to claim 4 , wherein
the sound absorbing layer includes a thick portion and a thin portion that is formed by compressing the air permeable material by a greater amount than the thick portion, and
the thin portion of the sound reducing wall portion is coupled to the molded plastic portion.

6. The air cleaner for an internal combustion engine according to claim 5 , wherein
a gradual change portion is provided between the thick portion and the thin portion, and
the gradual change portion is formed such that the thickness gradually decreases from the thick portion to the thin portion.

7. The air cleaner for an internal combustion engine according to claim 5 , wherein only the first housing includes the sound reducing wall portion.

8. The air cleaner for an internal combustion engine according to claim 1 , wherein
an outer layer is provided on an outer side of the sound absorbing layer, and
the outer layer is made of a material having a lower air permeability than that of the sound absorbing layer.

9. The air cleaner for an internal combustion engine according to claim 1 , wherein
the inner covering layer has air permeability, and
an adsorbent that adsorbs fuel vapor is provided between the inner covering layer and the sound absorbing layer.

Assignees

• Toyota Boshoku Kk

Inventors

• Kimura Ryusuke
• Inuzuka Yoshinori

Classifications

• F02M35/02491

  Flat filter elements, e.g. rectangular · CPC title

• F02M35/14 Primary

  Combined air cleaners and silencers · CPC title

• F02M35/0201

  Housings; Casings; Frame constructions; Lids; Manufacturing or assembling thereof · CPC title

• F02M25/08

  adding fuel vapours drawn from engine fuel reservoir {(electrical control of purge system F02D41/003)} · CPC title

• F02M35/1272

  using absorbing, damping, insulating or reflecting materials, e.g. porous foams, fibres, rubbers, fabrics, coatings or membranes · CPC title