Vehicle undershield
View Patent ↗A vehicle undershield is disclosed which is made from a material which is essentially conformed to the shape of the wheel housing and attached thereto, which undershield, due to its shape and structure, provides protection from corrosion by the sandblasting effect, causes reduction of the spray mist occurring on road surfaces wet from rain, and an effective noise damping on roads wet from rain and also on dry roads, having a sound-absorbing design for air-borne sound coming from the side facing away from the wheel, having a very good self-cleaning effect, while having a low weight of the constructional part.
1. A vehicle undershield which is essentially conformed to the shape of the wheel housing and attached thereto, consisting of two layered structures including a water-repellent impermeable self-supporting plastic sheet on the side facing towards the wheel, and an adjacently positioned non-woven made of plastic fibers in direct contiguous contact with said self-supporting plastic sheet on a side of said plastic sheet facing away from the wheel.
2. A vehicle undershield according to claim 1 , characterized in that said plastic sheet and plastic fibers are non-adhesively bonded to one another.
3. The vehicle undershield according to claim 1 , characterized in that said plastic sheet and plastic fibers are of the same material.
4. The vehicle undershield according to claim 3 , characterized in that said same material is thermoplastic.
5. The vehicle undershield according to claim 1 , characterized in that said plastic sheet and plastic fibers are of different materials.
6. The vehicle undershield according to claim 1 , characterized in that said plastic sheet contains polypropylene, polyethylene terephthalate, polyethylene, polybutylene terephthalate, polyamide or combinations thereof.
7. The vehicle undershield according to claim 1 , characterized in that said non-woven has a flow resistance of from 300 Pa·s/m to 4000 Pa·s/m.
8. The vehicle undershield according to claim 1 , characterized in that said plastic sheet has a loss factor of from 0.1 to 0.3.
9. The vehicle undershield according to claim 1 , characterized in that said plastic sheet has a modulus of elasticity of from 50 MPa to 10,000 MPa.
10. The vehicle undershield according to claim 1 characterized in that said plastic sheet is closed at least on the side facing toward the wheel.
11. The vehicle undershield according to claim 1 , characterized in that said plastic sheet has a weight per unit area of from 300 to 9000 g/m 2 .
12. The vehicle undershield according to claim 1 characterized in that said non-woven is a needle-punched web.
13. The vehicle undershield according to claim 1 , characterized in that said non-woven consists of needle-punched fibers of polypropylene, polyethylene terephthalate, polyethylene, polybutylene terephthalate, polyamide or a combination thereof.
14. The vehicle undershield according to claim 13 , characterized in that said non-woven has a weight per unit area of from 100 to 5000 g/m 2 .
15. The vehicle undershield according to claim 1 , characterized by having a structure with recesses in the region lying behind the wheel for dissipating water.
16. The vehicle undershield according to claim 15 , characterized in that said recesses are in the form of v-shaped grooves running in parallel to the direction of rotation of the wheel.
17. The vehicle undershield according to claim 1 , characterized in that said plastic sheet has a modulus of elasticity of from 600 MPa to 1000 MPa.
18. The vehicle undershield according to claim 1 , characterized in that said plastic sheet has a weight per unit area of from 500 to 2000 g/m 2 .
19. The vehicle undershield according to claim 1 , characterized in that said non-woven has a weight per unit area of from 500 to 1500 g/m 2 .
20. The vehicle undershield according to claim 1 , characterized in that said non-woven is sound absorbing.