Nissan Motor Company Limited

Mahle Filter Systems Japan Corporation

Kasai Kogyo Co., Ltd.

Ichiro Fukumoto

Masashi Shinada

Takashi Kawano

Takafumi Ito

Takayuki Akimoto

The present invention provides an automobile sound insulation panel which suitably implements a lightweight sound insulation panel with an expanded sound isolation-target frequency band and improved sound isolation performance. An automobile sound insulation panel includes a first panel member, a second panel member, and an elastic sheet member positioned between the first panel member and the elastic sheet member. The elastic sheet member includes a first projection-recess part. The first panel member abuts on respective upper opening edges of a plurality of recesses that form the first projection-recess part. Individual air layers exist between the second panel member and the elastic sheet member. A continuous air layer exists between the first panel member and the elastic sheet member.

Automobile sound insulation panel

An intake air noise adjuster includes: a communicating conduit including: a first end communicating to an intake air passage to an engine, and a second end communicating to an external air; an elastic body configured to block the communicating conduit; and a flow channel area changer configured to change a flow channel area of the communicating conduit based on a change of an intake air negative pressure caused in the intake air passage.

Intake air noise adjuster

Growing community of inventors

Kodaira, Japan

Ichiro Fukumoto