Inlet duct for internal combustion engine

Patent metadata

Field	Value
Publication number	US-11156150-B2
Application number	US-202016915521-A
Country	US
Kind code	B2
Filing date	Jun 29, 2020
Priority date	Jul 5, 2019
Publication date	Oct 26, 2021
Grant date	Oct 26, 2021

Abstract

An inlet duct includes a tubular main body formed by a compression-molded fibrous molded body. The main body includes an alternate layout region in which an air-impermeable high-compression portion and an air-permeable low-compression portion hat is compression-molded at a lower compressibility than a compressibility of the high-compression portion are alternately laid out in an axial direction of the main body. The alternate layout region is configured such that an arbitrary pair of points at an equal distance in the axial direction to a central position in an upstream region and a downstream region of the alternate layout region include only points that are both located in the low-compression portions and points one of which is located in the low-compression portion and the other one of which is located in the high-compression portion.

First claim

The invention claimed is:

1. An inlet duct for an internal combustion engine, the inlet duct comprising a tubular main body formed by a compression-molded fibrous molded body, wherein
the main body includes an alternate layout region in which an air-impermeable high-compression portion and an air-permeable low-compression portion that is compression-molded at a lower compressibility than a compressibility of the high-compression portion are alternately laid out in an axial direction of the main body,
the alternate layout region is divided into an upstream region and a downstream region of a central position in an axial direction of the inlet duct in a flow direction of intake air, and
the alternate layout region is configured such that an arbitrary pair of points at an equal distance in the axial direction to the central position in the upstream region and the downstream region include only points that are both located in the low-compression portions and points one of which is located in the low-compression portion and the other one of which is located in the high-compression portion.

2. The inlet duct according to claim 1 , wherein
the low-compression portion is a first low-compression portion,
a part of the main body in a circumferential direction is provided with an air-permeable second low-compression portion that is extended in the axial direction and compression-molded at a lower compressibility than the compressibility of the high-compression portion, and
the alternate layout region is adjacent to the second low-compression portion in the circumferential direction of the main body.

3. The inlet duct according to claim 2 , wherein
the alternate layout region is one of a plurality of alternate layout regions,
the alternate layout regions are spaced apart from one another by a predetermined distance in the circumferential direction of the main body, and
the second low-compression portion is arranged between adjacent ones of the alternate layout regions in the circumferential direction.

4. The inlet duct according to claim 1 , wherein
the alternate layout region is one of a plurality of alternate layout regions, and
the alternate layout regions are spaced apart from one another by a predetermined distance in a circumferential direction of the main body.

5. The inlet duct according to claim 1 , wherein
the main body includes a first halved body and a second halved body that have a half cylinder shape, and
the high-compression portions are arranged differently in the first halved body and the second halved body on a downstream side or an upstream side of the central position.

Assignees

• Toyota Boshoku Kk

Inventors

• Kimura Ryusuke

Classifications

• F02B27/0215 Primary

  Oscillating pipe charging, i.e. variable intake pipe length charging · CPC title

• F02M35/10098 Primary

  Straight ducts · CPC title

• F02M35/108 Primary

  with primary and secondary intake passages · CPC title

• F02M35/12

  Intake silencers {; Sound modulation, transmission or amplification (intake silencers also used as exhaust silencer F01N13/007; filters for compressors F04B39/16)} · CPC title

• Y02T10/12

  Improving ICE efficiencies · CPC title