Intake duct for internal combustion engine

Patent metadata

Field	Value
Publication number	US-11199165-B2
Application number	US-201916715324-A
Country	US
Kind code	B2
Filing date	Dec 16, 2019
Priority date	Dec 25, 2018
Publication date	Dec 14, 2021
Grant date	Dec 14, 2021

Abstract

An intake duct for an internal combustion engine includes a pipe-shaped shell. The shell includes a first molded product and a second molded product. The first molded product is formed by a plastic molded product and includes an opening extending through the first molded product in the thickness direction. The second molded product is formed by a fiber molded product produced through compression molding. The second molded product includes an air-permeable fitting projection fitted into the opening, and the second molded product is joined with an outer surface of the first molded product.

First claim

What is claimed is:

1. An intake duct for an internal combustion engine, the intake duct comprising:
a pipe-shaped shell including:
a first molded product formed by a plastic molded product and including an opening extending through the first molded product in a thickness direction, and
a second molded product formed by a fiber molded product produced through compression molding, wherein the second molded product includes an air-permeable fitting projection fitted into the opening, and the second molded product is joined with an outer surface of the first molded product, wherein

the air-permeable fitting projection is an air-permeable low-compression portion having a first thickness,
the second molded product further includes an air-impermeable high-compression portion that is compressed to a higher degree than the air-permeable fitting projection, the air-impermeable high-compression portion having a second thickness that is smaller than the first thickness, and
the air-impermeable high-compression portion is not fitted into the opening.

2. The intake duct according to claim 1 , wherein the fitting projection includes a projection end surface that is flush with an inner surface of the first molded product adjacent to the fitting projection, and
the inner surface of the first molded product defines a part of an inner surface of the intake duct.

3. The intake duct according to claim 1 , wherein
the shell includes a first segment and a second segment joined with the first segment in a circumferential direction,
the first segment is formed by a fiber molded product produced through compression molding and includes an air-permeable and low-compression portion and a high-compression portion that is compressed to a higher degree than the low-compression portion, and
the second segment includes the first molded product and the second molded product.

4. The intake duct according to claim 3 , wherein
the first molded product includes a bottom wall, two opposing walls that are bent and extended from two side edges of the bottom wall and opposed to each other, and two flanges that are bent and extended from the two opposing walls,
the two flanges are joined with the first segment,
the second molded product includes a bottom portion and two side portions, the two side portions being bent and extended from two side edges of the bottom portion, and
the second molded product is joined with the outer surface of the first molded product such that the bottom portion of the second molded product covers the bottom wall of the first molded product and that each side portion of the second molded product covers a corresponding one of the opposing walls of the first molded product.

5. An intake duct for an internal combustion engine, the intake duct comprising:
a pipe-shaped shell including:
a first molded product formed by a plastic molded product and including an opening extending through the first molded product in a thickness direction, and
a second molded product formed by a fiber molded product produced through compression molding, wherein the second molded product includes an air-permeable fitting projection fitted into the opening, and the second molded product is joined with an outer surface of the first molded product, wherein

the shell includes a first segment and a second segment joined with the first segment in a circumferential direction,
the first segment is formed by a fiber molded product produced through compression molding and includes an air-permeable and low-compression portion and a high-compression portion that is compressed to a higher degree than the low-compression portion,
the second segment includes the first molded product and the second molded product,
the first molded product includes a bottom wall, two opposing walls that are bent and extended from two side edges of the bottom wall and opposed to each other, and two flanges that are bent and extended from the two opposing walls,
the two flanges are joined with the first segment,
the second molded product is joined with outer surfaces of the bottom wall and the two opposing walls of the first molded product,
the opening is one of a plurality of openings arranged in the bottom wall and in the opposing walls, and
the fitting projection is one of a plurality of fitting projections arranged on the second molded product and fitted into the corresponding openings.

6. The intake duct according to claim 5 , wherein
the fitting projection includes a projection end surface that is flush with an inner surface of the first molded product adjacent to the fitting projection, and
the inner surface of the first molded product defines a part of an inner surface of the intake duct.

7. The intake duct according to claim 2 , wherein an inner surface of the air-impermeable high-compression portion of the second molded product contacts the outer surface of the first molded product.

Assignees

• Toyota Boshoku Kk

Inventors

• Kimura Ryusuke
• OHNO Tomoyo

Classifications

• F02M35/112

  for engines with cylinders all in one line · CPC title

• F02M35/1036

  by welding, bonding or the like (welding plastic materials together in general B29C65/02) · CPC title

• F02M35/10144

  Connections of intake ducts to each other or to another device · CPC title

• F02M35/10 Primary

  Air intakes; Induction systems · CPC title

• F05C2225/08

  Thermoplastics · CPC title