Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62D—MOTOR VEHICLES; TRAILERS
  • B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
  • B62D29/001—Superstructures, understructures, or sub-units thereof, characterised by the material thereof characterised by combining metal and synthetic material

Definitions

• the invention relates to a method for stiffening the metallic chassis, in particular the floor assembly of passenger cars.
• the invention has for its object to provide a novel method for stiffening passenger cars - which does not require a roof structure, roll bar or the like.
• the object is achieved by the following steps:
• the inside of the chassis, in particular the base assembly, is coated with an absorbent, textile material; - 2 -
• FIG. 1 shows the coated inside of a motor vehicle chassis.
• Figure 2 is a sectional view taken along line 2-2.
• FIG. 3 is a perspective view of a convertible
• FIG. 4 schematically shows the inside of a motor vehicle chassis coated with a plastic-impregnated material web
• Fig. 5 is a sectional view of a cavity of the chassis
• Fig. 6 shows the lined and stiffened cavity.
• 1 shows the inside of a metallic chassis 1, in particular the floor assembly 2 for a passenger car in the form of a convertible.
• the entire inside is, cf. also the sectional view according to FIG. 2, covered with a stiffening covering 3, which makes it possible to dispense with the roof construction or a roll bar otherwise prescribed for passenger cars.
• the stiffening covering is applied in the following manner: First, the inside of the chassis, which may have been cleaned beforehand, is coated with an absorbent, textile material, for example a * woven, knitted or knitted material or a nonwoven.
• the textile material can consist of idramid, polyester, polyamide, carbon and / or glass fiber, that is to say in particular also comprise a mixture of such fibers.
• a flowable, hardenable synthetic resin Epoxy, polyester or polyurethane resins are suitable.
• the impregnated textile material is then positively pressed onto the inner surface structure of the chassis while exerting pressure, so that it firmly connects to this, whereby the resin impregnation can also cause the impregnated textile material to bond to the surface of the chassis prepared for this purpose, in particular can be coated.
• the synthetic resin in the textile material is allowed to harden under pressure, thereby stiffening the entire chassis.
• the pressure exerted on the material impregnated with synthetic resin is advantageously carried out in the following manner: the side, in the door area in particular, is sealed with the chassis, which is impregnated with synthetic resin, textile material on the inside, with a preferably aqueous suspension of sand, mud or the like and allows a pressure to act on the top of this suspension by means of a flat pressure pad, the pressure pad being supported on its side opposite the suspension by a corresponding frame. Because of the pressure generated in this way, the synthetic resin-impregnated textile material fits positively on the surface of the chassis.
• the curing of the synthetic resin is preferably also carried out under pressure.
• the fibers of the material can be chemically impregnated.
• the impregnation, exertion of pressure and curing of the synthetic resin in the textile material can take place at elevated or at room temperature, depending on the type of resin used.
• the hardened plastic in the textile material can be tempered at elevated temperature.
• the method described is primarily suitable for stiffening convertibles in which a roll bar is to be eliminated. In general, however, the method described is suitable for the stiffening of the chassis in all passenger cars, but primarily those without a stiffening roof structure are intended, for example the convertible 5 shown in FIG. 3.
• an intermediate layer can be introduced between the resin-impregnated material and the chassis, for example in the following way:
• the inside of the chassis is covered with a fleece or felt layer of 1 to 2 mm in thickness before the textile material is introduced.
• the textile material is then applied and the process continues as described above.
• the covering formed by the textile material and the resin is removed from the mold and removed from the chassis.
• an adhesive which takes the place of the fleece or felt layer is introduced onto the stiffening covering and / or the inside of the chassis, if appropriate after application of an adhesive base.
• the textile material soaked in resin is then used again.
• a polyurethane adhesive one-component adhesive
• This adhesive is selected according to the desired degree of stiffening of the chassis, with an appropriately elastic and appropriately soft or hard adhesive being selected. As a result, the degree of stiffening can be controlled within wide limits.
• the method described above is essentially suitable for freely exposed, easily accessible surfaces of the chassis, in particular in the floor assembly of the motor vehicle. Methods are described below which are designed such that they are also suitable for cavities in the motor vehicle chassis, in particular for cavities in the area of the sill, for A, B and C pillars in the door area, for cardan tunnels and the same.
• FIG. 4 shows the inside and side of a metallic chassis 11, in particular the floor assembly 12 for a passenger car in the form of a convertible.
• the entire inside is covered with a plastic-impregnated, stiffening material web 13.
• the chassis 11 has cavities, for example a cavity 14 running essentially horizontally and parallel to the longitudinal axis of the chassis in the area of the rocker panel, two approximately vertical cavities 15 in the area of the A-pillar and a cavity 16 which is open at the bottom Area of the cardan tunnel.
• cavities can also be provided elsewhere, for example in the area of B and C pillars. These cavities are open on at least one, preferably two end faces and are therefore accessible from the outside.
• the synthetic resin-impregnated material web 17 unrolls and presses positively against the inner surfaces of the cavity 14.
• the synthetic resin is then allowed to harden under pressure and the relaxed tube 18 is then pulled out of the cavity.
• the cavity 14 lined and stiffened by the resin-impregnated material web 17 is shown in FIG. 6.
• This method can be applied to all around closed cavities that are open at both ends, such as the cavity 14 in the sill area. Cavities open only on one end face can be lined with the material web 17 in this way. Cavities open on one side, such as the cardan tunnel 16, can also be lined internally in this way.
• the width of the Werkstoffbahn17 S o is dimensioned such that edges are flush with each other.
• the edge regions of the material web 17 in the cavity to be lined can also overlap completely or partially. This does not impair the degree of stiffening, but rather increases it.
• the plastic-impregnated material web 17 will adhere firmly to the inside of the cavity 14 with unevenness and the like. If necessary, an adhesive can also be applied before the material web is introduced.
• the textile material web 17 can consist of aramid, polyester, polyamide, carbon and / or glass fibers. It can be woven, knitted or knitted. The fibers of the textile material web can also be chemically impregnated to increase their absorbency in relation to the plastic that penetrates them.
• the flowable synthetic resins with which the works web 17 is impregnated are primarily epoxy, polyester or polyurethane resins.
• the application of pressure with the aid of the hose 18 to the plastic-impregnated material web 17 and / or the curing of the plastic can be carried out at room temperature or at an elevated temperature.
• the cured synthetic resin can then also be annealed at an elevated temperature.
• the inflatable tube 1_ dispense.
• the hose will replaced by a mass of expanding plastic which, during its expansion, unrolls the material web 17 in the same way as the hose 18 above and presses it positively against the inner surfaces of the cavity under pressure.
• a mass of expanding plastic which, during its expansion, unrolls the material web 17 in the same way as the hose 18 above and presses it positively against the inner surfaces of the cavity under pressure.
• a plastic foam is primarily an expanding plastic. In contrast to the hose 18, the plastic foam remains inside the material web lining the cavity.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Structural Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Body Structure For Vehicles (AREA)
• Laminated Bodies (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)
• Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)

Applications Claiming Priority (4)

Publications (1)

Family

ID=25854802

Family Applications (2)

Family Applications Before (1)

Country Status (7)

Families Citing this family (10)

Family Cites Families (11)

• 1987
  • 1987-08-28 DE DE19873728757 patent/DE3728757A1/de not_active Withdrawn
• 1988
  • 1988-04-13 DE DE8888105903T patent/DE3867115D1/de not_active Expired - Lifetime
  • 1988-04-13 WO PCT/EP1988/000311 patent/WO1988007954A1/de not_active Application Discontinuation
  • 1988-04-13 AT AT88105903T patent/ATE70792T1/de active
  • 1988-04-13 ES ES198888105903T patent/ES2027723T3/es not_active Expired - Lifetime
  • 1988-04-13 JP JP63503655A patent/JPH0659842B2/ja not_active Expired - Lifetime
  • 1988-04-13 EP EP88105903A patent/EP0287941B1/de not_active Expired - Lifetime
  • 1988-04-13 EP EP88903789A patent/EP0357651A1/de active Pending
• 1991
  • 1991-12-31 GR GR91402245T patent/GR3003478T3/el unknown

Non-Patent Citations (1)

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