Manufacturing method for a steering wheel

A method of producing a steering wheel having a wheel skeleton with a hub, a rim and spokes interconnecting the hub and the rim, wherein a shaped body of a dissolvable material and corresponding in shape to an airbag module is attached to said hub, the skeleton with the shaped body is placed in a mold, a plasticized molding material is molded around said rim and said spokes and over said shaped body forming a steering wheel body with a seamless casing, said steering wheel body is removed from the mold, the shaped body is dissolved and removed, leaving a hollow space for accommodation of said airbag module, and the shaped body is provided with a covering of an elastomeric material.

A method of producing a steering wheel having a wheel skeleton with a hub, a rim and spokes interconnecting the hub and the rim, wherein a shaped body of a dissolvable material and corresponding in shape to an airbag module is attached to said hub, the skeleton with the shaped body is placed in a mold, a plasticized molding material is molded around said rim and said spokes and over said shaped body forming a steering wheel body with a seamless casing, said steering wheel body is removed from the mold, the shaped body is dissolved and removed, leaving a hollow space for accommodation of said airbag module, and the shaped body is dissolved with a solvent comprising one of toluene, xylene and methylene chloride.

A method of producing a steering wheel having a wheel skeleton with a hub, a rim and spokes interconnecting the hub and the rim, wherein a shaped body of a dissolvable material and corresponding in shape to an airbag module is attached to said hub, the skeleton with the shaped body is placed in a mold, a plasticized molding material is molded around said rim and said spokes and over said shaped body forming a steering wheel body with a seamless casing, said steering wheel body is removed from the mold, the shaped body is dissolved and removed, leaving a hollow space for accommodation of said airbag module, and the steering wheel body is introduced with the shaped body into a solvent bath.

A method of producing a steering wheel having a wheel skeleton with a hub, a rim and spokes interconnecting the hub and the rim, wherein a shaped body of a dissolvable material and corresponding in shape to an airbag module is attached to said hub, the skeleton with the shaped body is placed in a mold, a plasticized molding material is molded around said rim and said spokes and over said shaped body forming a steering wheel body with a seamless casing, said steering wheel body is removed from the mold, the shaped body is dissolved and removed, leaving a hollow space for accommodation of said airbag module, and the shaped body is dissolved by application of solvent vapors.

A method of producing a steering wheel having a wheel skeleton with a hub, a rim and spokes interconnecting the hub and the rim, wherein a shaped body of a dissolvable material and corresponding in shape to an airbag module is attached to said hub, the skeleton with the shaped body is placed in a mold, a plasticized molding material is molded around said rim and said spokes and over said shaped body forming a steering wheel body with a seamless casing, said steering wheel body is removed from the mold, the shaped body is dissolved and removed, leaving a hollow space for accommodation of said airbag module, and the casing has a central cover area provided with a reinforcement by an embedded structure.

A method of producing a steering wheel having a wheel skeleton with a hub, a rim and spokes interconnecting the hub and the rim, wherein a shaped body of a dissolvable material and corresponding in shape to an airbag module is attached to said hub, the skeleton with the shaped body is placed in a mold, a plasticized molding material is molded around said rim and said spokes and over said shaped body forming a steering wheel body with a seamless casing, said steering wheel body is removed from the mold, the shaped body is dissolved and removed, leaving a hollow space for accommodation of said airbag module, and said casing is molded with a lateral opening for introduction of said airbag module.