Sound absorbing cover, sound absorbing assembly, and magnetic induction foam molding device

Patent metadata

Field	Value
Publication number	US-9551144-B2
Application number	US-201514637048-A
Country	US
Kind code	B2
Filing date	Mar 3, 2015
Priority date	Sep 30, 2013
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

A sound absorbing cover is made of foam containing magnetic filler and is integrally molded in a three-dimensional shape so as to cover at least a part of a mating member that is a noise source. The sound absorbing cover includes side walls that cover side surfaces of the mating member and a bottom wall that covers a bottom surface of the mating member that intersects with the side surfaces of the mating member. The magnetic filler is oriented in a thickness direction of each of the side walls and the bottom wall. A sound absorbing assembly includes the sound absorbing cover and a fixing cover that is attached to the outer peripheral surface of the sound absorbing cover and that fixes, to a base, the sound absorbing cover and the mating member that is a noise source covered by the sound absorbing cover.

First claim

The invention claimed is:

1. A sound absorbing cover that is made of foam containing magnetic filler, the sound absorbing cover comprising:
a side wall that covers side surfaces of a mating member that is a noise source and
a bottom wall that covers a bottom surface of the mating member that intersects with the side surfaces of the mating member, wherein
the sound absorbing cover has a three-dimensional shape for covering the side surfaces and the bottom surface of the mating member,
the sound absorbing cover is integrally molded in the three-dimensional shape by using a molding die that defines a concaved cavity inside and includes a first magnet disposed at a center of the cavity and having a rod shape and a second magnet disposed in a peripheral portion and a bottom portion of the cavity, and by injecting a mixed raw material containing a foam resin raw material and the magnetic filler into the cavity and performing foam molding while lines of magnetic force are generated between the first magnet and the second magnet, and
the magnetic filler is oriented in the thickness direction of each of the side wall and the bottom wall.

2. The sound absorbing cover according to claim 1 , wherein
at least a part of each of the side wall and the bottom wall is disposed so as to be in contact with any of the side surfaces and the bottom surface of the mating member.

3. The sound absorbing cover according to claim 1 , wherein
one or both of the side wall and the bottom wall has a thinner portion.

4. A sound absorbing assembly characterized by comprising:
the sound absorbing cover as claimed in claim 1 ; and
a fixing cover that is attached to an outer peripheral surface of the sound absorbing cover and that fixes, to a base, the sound absorbing cover and the mating member that is a noise source covered by the sound absorbing cover.

5. The sound absorbing assembly according to claim 4 , wherein
the fixing cover includes a body in which the sound absorbing cover and the mating member are housed and a leg fixed to the base; and
the sound absorbing cover and the mating member are supported so as to be spaced by the length of the leg from the base.

6. A magnetic induction foam molding device for producing the sound absorbing cover as claimed in claim 1 , comprising:
the molding die that defines the concaved cavity inside and includes the first magnet and the second magnet, wherein
the magnetic induction foam molding device injects the mixed raw material containing the foam resin raw material and the magnetic filler into the cavity, and performs the foam molding while the lines of magnetic force are generated between the first magnet and the second magnet.

Assignees

• Sumitomo Riko Co Ltd

Inventors

• Tomiyama Koji
• KUTSUNA Ryosuke
• YABU Akio

Classifications

• E04B2001/8245

  Machines for manufacturing, shaping, piercing or filling sound insulating elements · CPC title

• B29C33/06

  using radiation {, e.g. electro-magnetic waves, induction heating} · CPC title

• E04B1/84 Primary

  Sound-absorbing elements · CPC title

• G10K11/162 Primary

  Selection of materials · CPC title

• B29C39/02

  for making articles of definite length, i.e. discrete articles · CPC title