US-20260125002-A1 - LUGGAGE SIDE TRIM

US20260125002A1US 20260125002 A1US20260125002 A1US 20260125002A1US-20260125002-A1

Abstract

A luggage side trim includes: an interior-side front surface layer included in an interior-side surface; a panel-side back surface layer that is included in a surface on a side of an inner panel and has an edge that is fixed to the interior-side front surface layer; and an intermediate air layer interposed between the interior-side front surface layer and the panel-side back surface layer, in which the panel-side back surface layer is a molded article including a layer of an air-permeable base material.

Inventors

Ichiro Fukumoto
Tomohiro Tsuiki
Yuki Doi

Assignees

KASAI KOGYO CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20251218

Claims (8)

1 . A luggage side trim comprising: an interior-side front surface layer included in an interior-side surface; a panel-side back surface layer that is included in a surface on a side of an inner panel and has an edge that is fixed to the interior-side front surface layer; and an air layer interposed between the interior-side front surface layer and the panel-side back surface layer, wherein the panel-side back surface layer is a molded article including a layer of an air-permeable base material, the panel-side back surface layer includes: a thick-wall section where the air-permeable base material is partially thickened; and a thin-wall section where the air-permeable base material is partially thinned, an opening is formed through the inner panel, the thick-wall section is disposed facing the opening, and the thin-wall section is disposed facing a wheelhouse panel or a drafter.
2 . The luggage side trim according to claim 1 , wherein the panel-side back surface layer includes a duct wall section included in a duct together with the inner panel, a wheelhouse panel, or a floor panel.
3 . The luggage side trim according to claim 1 , wherein the thick-wall section has greater air permeability of the air-permeable base material than the thin-wall section.
4 . The luggage side trim according to claim 1 , wherein the panel-side back surface layer includes an uneven section that is provided at a boundary between the thick-wall section and the thin-wall section and is concave in a direction away from the inner panel.
5 . The luggage side trim according to claim 1 , wherein the panel-side back surface layer has a difference in area density of the air-permeable base material between an interior side and a side of the inner panel.
6 . The luggage side trim according to claim 1 , wherein the interior-side front surface layer is a molded article including a layer of an air-impermeable base material.
7 . A luggage side trim comprising: an interior-side front surface layer included in an interior-side surface; a panel-side back surface layer that is included in a surface on a side of an inner panel and has an edge that is fixed to the interior-side front surface layer; and an air layer interposed between the interior-side front surface layer and the panel-side back surface layer, wherein the panel-side back surface layer is a molded article including a layer of an air-permeable base material, the panel-side back surface layer includes: a thick-wall section where the air-permeable base material is partially thickened; and a thin-wall section where the air-permeable base material is partially thinned, and the thick-wall section has greater air permeability of the air-permeable base material than the thin-wall section.
8 . A luggage side trim comprising: an interior-side front surface layer included in an interior-side surface; a panel-side back surface layer that is included in a surface on a side of an inner panel and has an edge that is fixed to the interior-side front surface layer; and an air layer interposed between the interior-side front surface layer and the panel-side back surface layer, wherein the panel-side back surface layer is a molded article including a layer of an air-permeable base material, the panel-side back surface layer includes: a thick-wall section where the air-permeable base material is partially thickened; and a thin-wall section where the air-permeable base material is partially thinned, and the panel-side back surface layer includes an uneven section that is provided at a boundary between the thick-wall section and the thin-wall section and is concave in a direction away from the inner panel.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation application of PCT International Application No. PCT/JP2023/025388, filed on July 10, 2023, the entire contents of which are hereby incorporated by reference. BACKGROUND 1. Technical Field The present invention relates to a luggage side trim. 2. Description of the Background A soundproof structure that reduces vehicle cabin noise caused by road noise (e.g. see JP-2008-162549-A, hereinafter referred to as Patent Literature 1), a sound absorbing structure that reduces noise propagated from an extractor opening through a ventilation space into a vehicle cabin (e.g. see JP-2018-202991-A, hereinafter referred to as Patent Literature 2), and the like are known. In the soundproof structure described in Patent Literature 1, a felt material is fixed to a wheelhouse panel, and a sponge material is fixed to an inner panel. In addition, in the sound absorbing structure described in Patent Literature 2, a sound absorbing member is disposed between a ventilation opening and the extractor opening (drafter) so as to surround the entire circumference of the ventilation space. BRIEF SUMMARY In the soundproof/sound absorbing structures described in Patent Literatures 1 and 2, the thickness, air permeability, area density, and the like of the sound absorbing members such as the felt material attached to a panel, a trim, and the like are uniform. In contrast, the frequency band of radiated sound having been transmitted through a wheelhouse panel or a drafter varies depending on conditions such as the presence or absence of an opening of an inner panel. Accordingly, the soundproof/sound absorbing structures described in Patent Literatures 1 and 2 cannot sufficiently achieve effects such as sound absorption, sound insulation, and distance-based attenuation with respect to radiated sound having been transmitted through a wheelhouse panel or a drafter. The present invention has been made in view of such circumstances, and an object thereof is to provide a luggage side trim that can effectively reduce the propagation, into a vehicle cabin, of noise that is generated around a luggage compartment such as radiated sound having been transmitted through a wheelhouse panel, a drafter, or the like. A luggage side trim according to the present invention includes: an interior-side front surface layer included in an interior-side surface; a panel-side back surface layer that is included in a surface on a side of an inner panel and has an edge that is fixed to the interior-side front surface layer; and an air layer interposed between the interior-side front surface layer and the panel-side back surface layer, in which the panel-side back surface layer is a molded article including a layer of an air-permeable base material. The present invention can provide a luggage side trim that can effectively reduce the propagation, into a vehicle cabin, of noise that is generated around a luggage compartment such as radiated sound having been transmitted through a wheelhouse panel, a drafter, or the like. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a cross-sectional view illustrating a luggage side trim and the body structure of a vehicle according to one embodiment of the present invention as seen from the rear side of the vehicle. FIG. 2 is an enlarged cross-sectional view of the luggage side trim illustrated in FIG. 1. FIG. 3 is a graph representing the relationship between the noise levels in the vicinity of an opening of an inner panel and the vicinity of a wheelhouse panel and 1/3 octave band center frequency. FIG. 4 is a cross-sectional view illustrating an overview of a first specimen for checking the performance of the luggage side trim. FIG. 5 is a cross-sectional view illustrating an overview of a second specimen for checking the performance of the luggage side trim. FIG. 6 is a graph representing the relationship between the transmission loss in the vicinity of the opening of the inner panel in cases where the first specimen and the second specimen are disposed in the vicinity of the opening of the inner panel and 1/3 octave band center frequency. FIG. 7 is a graph representing the relationship between the normal incidence sound absorption coefficient in the vicinity of the wheelhouse panel in cases where the first specimen and the second specimen are disposed in the vicinity of the wheelhouse panel and 1/3 octave band center frequency. FIG. 8 is a cross-sectional view illustrating a modification example of a panel-side back surface layer. FIG. 9 is a cross-sectional view illustrating a modification example of the panel-side back surface layer. FIG. 10 is a cross-sectional view illustrating a modification example of the panel-side back surface layer. FIG. 11 is a cross-sectional view illustrating a modification example of the panel-side back surface layer. FIG. 12 is a cross-sectional view illustrating a modification example of the panel-side back surface layer. FIG. 13 is