Coil spring and associated production method

Patent metadata

Field	Value
Publication number	US-2016116013-A1
Application number	US-201514924062-A
Country	US
Kind code	A1
Filing date	Oct 27, 2015
Priority date	Oct 28, 2014
Publication date	Apr 28, 2016
Grant date	—

Abstract

The production of a coil spring takes place by way of a combination of two method steps, wherein the first method step consists of a twisted extrusion method and the second method step consists of a cold bending process, as in traditional spring production.

First claim

1 . A coil spring, comprising a thin-walled core tube to which fibers made of a fiber composite material are attached by winding via a supply device, said fibers covering the core tube all around, said core tube being deformable together with the attached fibers on a bending device having an integrated cold bending machine.

2 . The coil spring as claimed in claim 1 , wherein the bending device comprises an external pressurized control roller, which is located opposite an internal bending roller with the spring material interposed, and a feed device interacts with the bending device, a guiding feed that receives the composite composed of core tube and fibers being positioned downstream of said feed device.

3 . A method for producing the coil spring of claim 1 , comprising the steps of applying the fibers of the fiber composite material to the core tube by means of a twisted extrusion process, and subsequently forming the composite comprising of the core tube and the applied fibers of the fiber composite material into the coil spring by a cold bending process in the cold bending machine of the bending device.

4 . The method of claim 3 , wherein the core tube is able to be supplied, together with the applied fibers of the fiber composite material, continuously to the bending device via the feed device and via the guiding feed, and the control and bending rollers of the bending device are able to bend the individual spring coils of the coil spring continuously and in succession.

5 . The method of claim 3 , wherein the feed device acts either on the composite of core tube and fibers or only on the core tube.

6 . The method of claim 3 , wherein the core tube comprises a plastifiable material.

7 . The method of claim 3 , wherein the fibers of the fiber composite material of the coil spring comprise an epoxy or thermoplastic matrix material.

8 . The method of claim 4 , wherein the feed device acts either on the composite of core tube and fibers or only on the core tube.

9 . The method of claim 4 , wherein the core tube comprises a plastifiable material.

10 . The method of claim 5 , wherein the core tube comprises a plastifiable material.

11 . The method of claim 4 , wherein the fibers of the fiber composite material of the coil spring comprise an epoxy or thermoplastic matrix material.

12 . The method of claim 5 , wherein the fibers of the fiber composite material of the coil spring comprises an epoxy or thermoplastic matrix material.

13 . The method of claim 6 , wherein the fibers of the fiber composite material of the coil spring comprises an epoxy or thermoplastic matrix material.

Assignees

• Porsche Ag

Inventors

• Tardy-Tuch Georg Von
• Peitz Volker

Classifications

• F16F1/3665 Primary

  Wound springs · CPC title

• F16F1/3605

  characterised by their material (F16F1/362, F16F1/364, F16F1/366, F16F1/37 take precedence; composition of macromolecular compounds in general C08L) · CPC title

• B29K2063/00

  Use of {EP, i.e.} epoxy resins {or derivatives thereof}, as moulding material · CPC title

• B29C47/021

  Operations & Transport · mapped topic

• B29C48/151

  Coating hollow articles · CPC title