Noise insulation element for the bulkhead of a vehicle body

Abstract

A noise insulation element (14) for the bulkhead (12) of a vehicle body (10) is provided with a mass-spring element (20) which has a plastic support layer (22) as the heavy layer with a front side facing away from the bulkhead (12) when the mass-spring element (20) is installed and with a rear side facing towards the bulkhead (12), and a noise damping layer (24) made from a noise insulating material connected to the rear wall as the spring layer. The support layer (22) is provided on its rear side with an integrally designed hollow fixing projection (16) which is formed on an edge recess with a recess edge which recess is open towards an outer limiting edge section (28) of the support layer (22) and a side wall (30) projecting from the rear side of the support layer (22) and extending along the recess edge.

Claims

1. A noise insulation element for a bulkhead of a vehicle body, comprising: a mass-spring element which has a plastic support layer with a front side facing away from the bulkhead and with a rear side facing towards the bulkhead, and a noise damping layer made from a noise absorption material connected to a rear wall, wherein the plastic support layer is provided on its rear side with a recess and an integrally designed hollow fixing projection, wherein the fixing projection has a bottom wall and a side wall rising from said bottom wall, wherein the side wall of the fixing projection extends along the recess of the plastic support layer and has an outer receiving groove for receiving an opening edge of a receiving opening formed in the vehicle body for the fixing projection, wherein the bottom wall of the fixing projection has a bottom wall opening which extends into at least a part of at least two opposite sections of the side wall of the fixing projection, or the bottom wall, in the plane formed thereby, and the side wall of the fixing projection are designed to be compressible in at least two opposite sections, and wherein the bottom wall of the fixing projection has a bottom wall opening extending into at least two opposite sections of the side wall of the fixing projection, and that the bottom wall opening of the fixing projection defines a line recess delimited by a recess edge for the passage of a line, wherein the recess edge of the line recess is provided for contact with the line and thus for maintaining the shape and for stabilizing the bottom wall opening and the line recess thereof.

2. The noise insulation element of claim 1, wherein the recess edge of the line recess in the bottom wall of the fixing projection is provided with noise damping material as a scoring protector for the line and is embedded in noise damping material.

3. The noise insulation element of claim 1, characterized in that the bottom wall of the fixing projection has a bottom wall opening extending into at least two opposite sections of the side wall of the fixing projection, and that the bottom wall opening is designed as an oblong hole.

4. The noise insulation element of claim 1, characterized in that the side wall of the fixing projection is S-shaped for forming the outer receiving groove.

5. The noise insulation element of claim 4, further comprising: a first flank of the outer receiving groove of the side wall of the fixing projection is formed by the section of the rear side of the support layer adjoining the recess of the support layer and/or by noise damping material, wherein the outer receiving groove has a groove base formed by a first region of the side wall rising from the rear side of the support layer, and a second flank of the outer receiving groove opposite said first flank is formed by an outward extending section of the side wall, wherein the outward extending section of the side wall is adjoined by a further section of the side wall projecting from the outward extending section of the side wall and facing away from the rear side of the support layer, said further section transitioning into the bottom wall of the fixing protrusion.

6. The noise insulation element of claim 1, wherein the bottom wall of the fixing projection has a bottom wall opening which extends into at least three mutually offset sections of the side wall.

7. The noise insulation element of claim 6, wherein the bottom wall opening extends into four sections of the side wall of the fixing projection offset by 90° with respect to each other.

8. The noise insulation element of claim 1, wherein the recess of the support layer of the spring mass element is designed as an edge recess with a recess edge, the edge recess being open to an outer limiting edge section of the support layer, the side wall rising from the rear side of the support layer ending at the outer limiting edge section of the support layer.

9. The noise insulation element of claim 8, wherein the bottom wall of the fixing projection has a bottom wall opening extending from the outer limiting edge section of the support layer into at least a part of the section of the side wall of the fixing projection substantially opposite the outer limiting section of the support layer.

10. The noise insulation element of claim 8, wherein the side wall of the fixing projection has a cutout in the section substantially opposite the outer limiting edge section of the support layer.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention will be described in more detail hereinafter with reference to two embodiments and with reference to the drawings. Specifically, the Figures show:

(2) FIG. 1 is a perspective and exploded view of a vehicle body with a bulkhead noise insulation element,

(3) FIG. 2 is a front view of the noise insulation element of FIG. 1 in the region of one of its fixing projections (see region A in FIG. 1),

(4) FIG. 3 is a rear view of the noise insulation element of FIG. 1 in the region of one of its fixing projections (see region A in FIG. 1),

(5) FIG. 4 is a perspective view of the noise insulation element mounted on the vehicle body, in the region of the fixing projection, for the clarification of the interaction between the fixing projection and the vehicle body for the purpose of fixing the noise insulation element,

(6) FIG. 5 is a sectional view along line V-V in FIG. 4, and

(7) FIG. 6 is a front view of the noise insulation element with a fixing projection extending all around a recess,

(8) FIG. 7 is a rear view of the noise insulation element with a fixing projection extending all around a recess,

(9) FIG. 8 is a perspective view of the noise insulation element mounted on the vehicle body, in the region of the fixing projection, for the clarification of the interaction between the fixing projection and the vehicle body for the purpose of fixing the noise insulation element, and

(10) FIG. 9 is a sectional view along line IX-IX in FIG. 8.

DETAILED DESCRIPTION OF THE INVENTION

(11) FIG. 1 is a schematic illustration of a vehicle body 10 with a bulkhead 12 on which a noise insulation element 14 is arranged. The noise insulation element 14 is fixed to the bulkhead 12 at least in part by means of fixing projections 16, which may be hollow, integrally formed with the noise insulation element 14, which projections 16, when the noise insulation element 14 is in the mounted state, each cooperate with a respective receiving opening 26 in the vehicle body 10 in which the fixing projections 16 are positioned. In this embodiment the receiving openings 26 of the vehicle body 10 are formed in the region of the A-columns 18.

(12) As is visible e.g. in FIG. 5, the noise insulation element 14 has a mass spring (plate) element 20 comprising a plastic support layer 22 as the heavy or mass layer of e.g. EVA/PE, PE, PP, EPDM, TPE TPO and/or polyurethane foam, each with a high percentage by weight of up to 70% of a mineral filler of high density, e.g. feldspar, and having a noise damping layer 24 of a noise damping material (e.g. PU foam).

(13) As shown in FIG. 4, a recess 27 is formed in the plastic support layer 22, an integrally formed fixing projection 16 extends around the recess 27. The recess 27 and the fixing projection 16 respectively extend to the outer limiting edge section 28 of the mass spring element 20. The fixing projection 16 has a side wall 30 extending along the opening edge 32 of the recess 27. Contiguous with the opening edge 32 of the recess 27, the side wall 30 has an outer receiving groove 34. Overall, the side wall 30 is S-shaped when seen in section as in FIG. 5.

(14) In this embodiment the end of the fixing projection 16 averted from the recess 27 of the plastic support layer 22 is formed by a bottom wall 36 having a gap- or slot-shaped bottom wall opening 38. This opening 38 extends into two opposite regions 39 of the side wall 30 and provides for the compressibility of the fixing projection 16 in the direction of the arrows 41 in FIG. 5. In the region 39 facing away from the outer limiting edge section 28 the side wall 30 has a cutout 40. Thereby, the fixing projection 16 can be inserted into the receiving opening 26 of the vehicle body 10. In the inserted state at least a partial section of the opening edge 32 of the receiving opening 26 is inserted into the outer receiving groove 34 of the side wall 30 of the fixing projection 16.

(15) As is further evident from FIGS. 2 to 5, the bottom wall opening 38 has a line recess 42 defined by a recess edge 44. In this enlarged region of the bottom wall opening 38, a line 46, e.g. a hydraulic line or an electric line, can be passed through the fixing projection 16. The line 46 may have an outer jacket 49 of e.g. foamed plastic material that serves as a scoring protector. As an alternative, for example foam may be applied around the edge of the bottom wall opening 38 to thereby provide a scoring protector for the line 46.

(16) After the assembly of the noise insulation element 14 to the vehicle body 10, a line 46 can thus be passed through the fixing projection 16. The line 46 stabilizes the bottom wall 36 by the fact that the recess edge 44 of the line recess 42 of the bottom wall opening 38 abuts on the outside of the line 46 or on the scoring protector (outer jacket 49) of the line 46 or by the fact that a scoring protector formed at the recess edge 44 abuts on the line 46. In this manner the line 46 or the scoring protector keeps the line recess 42 “open” and thus indirectly keeps the fixing projection 16 “spread” as illustrated in FIG. 5.

(17) As can be seen with reference to FIGS. 2 to 5, one flank 48 of the outer receiving groove 34 is formed by the section of the rear side 50 of the support layer 22, which adjoins the recess 27 in the support layer 22, or, if applicable, by noise damping material present there. The outer receiving groove 34 has a groove base 52 formed by a first region 54 of the side wall 30 rising from the rear side 50 of the support layer 22. Opposite the above-mentioned flank 56 a second flank 56 of the outer receiving groove 34 is located which is formed by a section 58 of the side wall 30 extending outward. This section 58 is adjoined by a further section 60 of the side wall 30 that transitions into the bottom wall 36 of the fixing projection 16.

(18) The recess 27 according to FIGS. 2 to 5 is designed as an edge recess open to the outer limiting edge section 28.

(19) FIGS. 6 to 9 illustrate an embodiment of a fixing projection 16′ of a noise insulation element 14′, wherein the side wall 30 extends all around the recess 27 of the support layer 22. In as far as the elements of the fixing projection 16′, which may be hollow, are identical with the elements of the fixing projection 16 of FIGS. 2 to 4 or correspond thereto, they are identified throughout FIGS. 6 to 9 by the same reference numerals as in FIGS. 2 to 5.

(20) For the fixing projection 16′ to be insertable into a receiving opening 26 of the vehicle body 10 in a comparatively simple manner, the bottom wall opening 38 preferably has a cross-slot or cross-gap structure. The bottom wall opening 38 again extends into respectively opposite sections of the side wall 30, so that the fixing projection 16′ is now compressible in two directions orthogonal to each other (see arrows 41 in FIG. 8). In the embodiment in FIGS. 2 to 5, such an interruption of the side wall at a plurality of opposite points is not necessary, since, there, the fixing projection 16 is open to the outer limiting edge section 28.

LIST OF REFERENCE NUMERALS

(21) 10 vehicle body 12 bulkhead 14 noise insulation element 14′ noise insulation element 16 fixing projection 16′ fixing projection 18 A column 20 mass spring (plate) element 22 plastic support layer of the mass spring element 24 noise damping layer of the mass spring element 26 receiving opening of the vehicle body 27 recess in the mass spring element 28 outer limiting edge section 30 side wall of the fixing projection 32 opening edge of the recess 34 outer receiving groove of the fixing projection 36 bottom wall of the fixing projection 38 bottom wall opening in the bottom wall 39 opposite regions of the fixing projection 40 cutout in the side wall 41 arrows 42 line recess 44 recess edge of the bottom wall opening 46 line 48 flank of the outer receiving groove 49 outer jacket 50 rear side of the mass spring element 52 groove base of the outer receiving groove 54 first region of the side wall 56 flank of the outer receiving groove 58 outward extending section of the side wall 60 further section of the side wall