Patent ID: 11897325
Assignee: KAUTEX TEXTRON GMBH & CO. KG
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B  F

Claim 10:
11. A method for producing a fuel tank filler tube for a fuel tank, comprising:
a) providing a tube portion formed of plastic by
extruding a hose formed of plastic which is provided for formation of the tube portion by blow molding;
introducing the hose into a cavity of a tool for the blow molding;
pre-forming the tube portion by closing the tool and/or applying an internal pressure to the hose interior, wherein the hose lies, at least in portions, against the tool;

b) providing a tubular adapter which is provided for the connection of the filler tube to the fuel tank;
wherein the adapter is produced from at least two material components,
wherein the first material component of the at least two material components is provided to structurally stiffen the adapter and the second material component of the at least two material components is provided to form the integrally bonded connection to the tube portion and;

c) connecting the adapter to the tube portion by a connecting device;
wherein, in method step c),
a lateral surface of the adapter is connected to a lateral surface of the tube portion by an integrally bonded connection,
the adapter and the tube portion are arranged so as to overlap in the region of the integrally bonded connection,
wherein the lateral surface of the adapter is, in the region of the integrally bonded connection, formed from a plastic which is welded to the plastic of the tube portion,
wherein the adapter in the region of the integrally bonded connection is two-layered comprising a first layer and a second layer,
wherein the lateral surface of the adapter is provided by the first layer and formed of the second material component,
wherein the first layer covers a main body being the second layer,
wherein the second layer is formed of the first material component, and
wherein the adapter comprises at least two circular cylindrical portions of different diameter, which are each connected to one another via a conical transition, wherein a first circular cylindrical portion of the at least two circular cylindrical portions and the conical transition comprises the lateral surface connected to the tube portion such that the first circular cylindrical portion and the conical transition of the adapter are both in direct contact with the tube portion.