FR2900614A1 - Soundproofing and lining piece for motor vehicle floor, has soft foam body integrated to felt reinforcement element arranged to present load bearing capacity larger than that of foam, where element has upper face not molded from casting - Google Patents

Abstract

The piece (1) has a soft foam body (2) integrated to a felt reinforcement element (3) molded from casting by the foam. The reinforcement element is arranged to present a load bearing capacity larger than that of the foam so as to limit the depression provoked by a passenger foot supported against the piece. The element presents an upper face (4) not molded from casting by the foam so as to permit the penetration and absorption of acoustic waves.

Description

The invention relates to a piece of lining and soundproofing of a

motor vehicle floor.

  It is known to produce a piece of lining and soundproofing of a motor vehicle floor, said part comprising a body made of flexible foam, usually of low lift, said part incorporating at least one rigid overmoulded reinforcing element, all or part of the foam, said member being arranged to have a lift greater than that of the foam, so as to limit the depression caused by the foot of a passenger disposed in abutment against said piece facing said element.

  The elements usually used are based on wood chipboard, cardboard, or similar materials.

  They have in particular the disadvantages of a high weight, low elasticity, not allowing them to be used as springs of a mass / spring type sound insulation system, and of low porosity, not allowing the absorption of cabin noise.

  The invention aims to overcome these disadvantages by providing a piece of lining and soundproofing of a motor vehicle floor whose or the reinforcing element has a low mass, a certain elasticity, combined with good lift , and sound absorption properties.

  For this purpose, the invention proposes a piece of lining and soundproofing of a motor vehicle floor, said part comprising a flexible foam-based body, said body incorporating at least one felt-based reinforcing element overmolded by the foam, said member being arranged to have a greater lift than that of the foam, so as to limit the depression caused by the foot of a passenger disposed in abutment against said piece facing said element. Other features and advantages of the invention will appear in the description which follows, made with reference to the attached figure which is a schematic representation in partial section of a part according to one embodiment of the invention.

  With reference to the figure, there is now described a lining and soundproofing part 1 of a motor vehicle floor, said part comprising a body 2 based on flexible foam, for example based on polyurethane, said body incorporating the at least one foam-based reinforcing element 3 molded with the foam, said element being arranged to have a greater lift than that of the foam, so as to limit the depression caused by the foot of a passenger disposed in support against said piece facing said element. According to the embodiment shown, the element 3 has an upper face 4 15 not overmolded by the foam, so as to allow the penetration and absorption of acoustic waves within it.

  In a manner not shown, the upper face 4 and the lower face of the element 3 may be overmolded by the foam, only its edge being overmolded.

  In a manner not shown, when one does not seek an absorption of sound waves by the element 3, said element can be entirely overmolded by the foam, its upper and lower faces 4 and its edge being covered with foam.

  According to one embodiment, at least one element 3 is in the form of a blank having a flat or developable geometry. Such an embodiment has a great simplicity due to the fact that it implements a simple overmolding of a felt blank by the foam.

  According to another embodiment, at least one element 3 is in the form of a blank provided with at least one radial cutout arranged so as to make it possible to give it a non-developable geometry within the foam by which it is overmoulded, this allowing to benefit from a reinforcement on non-developable zones, for example in heel board area.

  In a manner not shown, the part 1 may further comprise a sealing layer, for example based on thermoplastic elastomer loaded with mineral filler, said layer being disposed against the body 2, so as to form a mass-type insulation system / spring, the mass being formed by said layer and the spring being formed by said body.

  According to the embodiment shown, the part 1 further comprises a coating layer of appearance 5, for example based carpet. According to one embodiment, the piece 1 has a three-dimensional geometry provided with cells forming cellars with feet, an element 3 being disposed in the bottom of each of said housings.

  According to one embodiment, at least one element 3 is formed of at least two superposed layers based on felt, so as to optimize the resistance to penetration.

  Of course, the driving resistance can be adjusted by any other means known to those skilled in the art, such as the density of the felt, its thickness, the nature of the fibers used, etc.

Claims (8)

  1. Part (1) of lining and soundproofing of a motor vehicle floor, said part comprising a body (2) based on flexible foam, said piece being characterized in that said body incorporates at least one element (3). ) of reinforcing felt-based molded by the foam, said member being arranged to have a lift greater than that of the foam, so as to limit the depression caused by the foot of a passenger disposed in abutment against said piece facing said element.   2. Part according to claim 1, the element (3) having at least one face (4) not overmolded by the foam, so as to allow the penetration and absorption of acoustic waves therein.   3. Part according to one of claims 1 or 2, at least one element (3) being in the form of a blank having a flat or developable geometry. 20   4. Part according to one of claims 1 or 2, at least one element (3) in the form of a blank provided with at least one radial cutout arranged to allow to confer a geometry non developable within foam by which it is overmolded. 25   5. Part according to any one of claims 1 to 4, said part further comprising a sealing layer disposed against the body (2), so as to form a mass / spring type insulation system, the mass being formed by said layer and the spring being formed by said body. 30   6. Part according to any one of claims 1 to 5, said part further comprising an appearance coating layer (5). 5   7. Part according to any one of claims 1 to 6, said piece having a three-dimensional geometry provided with housing cellars with feet, an element (3) being disposed in the bottom of each of said housing.   8. Part according to any one of claims 1 to 7, at least one element (3) being formed of at least two layers based on felt, so as to optimize the resistance to depression.