Belt having a tension member, in particular a carbon tension member, which is prepared with a cross-linked polyurethane, and preparation method

Patent metadata

Field	Value
Publication number	US-9382969-B2
Application number	US-201414268249-A
Country	US
Kind code	B2
Filing date	May 2, 2014
Priority date	Nov 2, 2011
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

A belt comprises at least a belt body made of a polymer material having elastic properties, the belt including a cover layer as a belt backing, a substructure having a force-transmission zone, and a tension member in a ribbed design embedded in the belt body. The tension member is prepared with a cross-linked polyurethane in such a way that the polyurethane fills at least part of the tension member cavities. The polyurethane filling material enters into a mechanical connection to the tension member on the one hand and an adhesive connection to the belt body on the other hand. The polyurethane filling material has a Shore A hardness that is 0.5 to 10 times harder than the Shore A hardness of the belt body. The belt body is preferably likewise made of cross-linked polyurethane, in particular using a carbon tension member.

First claim

What is claimed is:

1. A belt comprising:
a belt body composed of a polymeric material having elastic properties and having a top ply as belt backing and a substructure having a power transmission zone; and,
a tensile member embedded in the belt body and being in cord construction, wherein the tensile member has been treated with a crosslinked polyurethane filling material, formed from a polyurethane prepolymer and a crosslinker, in such a way that the polyurethane fills at least some of the tensile member voids, the polyurethane filling material forming both a mechanical attachment to the tensile member and an adherent bond with the belt body;
wherein the polyurethane filling material has a Shore A hardness which is greater by 0.5 to 10 than the Shore A hardness of the belt body, and
wherein a diol is used to crosslink the polyurethane filling material.

2. The belt as claimed in claim 1 , wherein the polyurethane filling material has a Shore A hardness which is greater by 2 to 5 than the Shore A hardness of the belt body.

3. The belt as claimed in claim 1 , wherein the polyurethane filling material fills at least 20% of the tensile member voids.

4. The belt as claimed in claim 3 , wherein the polyurethane filling material fills at least 30% of the tensile member voids.

5. The belt as claimed in claim 1 , wherein a butanediol is used to crosslink the polyurethane filling material.

6. The belt as claimed in claim 1 , wherein the belt body consists of a crosslinked polyurethane.

7. The belt as claimed in claim 1 , wherein the tensile member is formed of a fibrous material.

8. The belt as claimed in claim 7 , wherein the fibrous material is selected from the group consisting of carbon fibers, glass fibers, aramid fibers, and basalt fibers or a mixture thereof.

9. The belt as claimed in claim 8 , wherein the fibrous material consists of carbon fibers.

10. The belt as claimed in claim 1 for use in drive technology.

11. The belt as claimed in claim 10 , wherein the belt is a toothed belt or a V-ribbed belt.

12. A method of treating the tensile member of a belt as claimed in claim 1 , the method comprising:
soaking the tensile member in a mixture of a polyurethane prepolymer, a crosslinker and an inert solvent or dispersant in a single treatment stage in the course of an upstream stage of the belt fabrication process, thereby filling at least some of the tensile member voids with the mixture; and,
subsequently drying the treated tensile member.

13. A method of treating the tensile member of a belt as claimed in claim 1 , the method comprising:
soaking the tensile member in a mixture of a polyurethane prepolymer, a crosslinker and an inert solvent or dispersant in each of two or more treatment stages in the course of an upstream stage of the belt fabrication process, thereby filling in each of the two or more treatment stages some of the tensile member voids with the mixture; and,
subsequently drying the treated tensile member.

14. The method as claimed in claim 13 , wherein the same mixture is employed in each of the two or more treatment stages.

15. The method as claimed in claim 13 , wherein a different mixture is employed in each of the two or more treatment stages.

Assignees

• Contitech Antriebssysteme Gmbh

Inventors

• Kucharczyk Andre
• Goeser Hubert
• Obert Markus
• Brocke Stephan

Classifications

• F16G1/16

  with reinforcement bonded by the plastic material {(making thereof B32B)} · CPC title

• F16G5/20

  with a contact surface of special shape, e.g. toothed · CPC title

• F16G1/28

  with a contact surface of special shape, e.g. toothed · CPC title

• C08J2375/04

  Polyurethanes · CPC title

• F16G5/14

  with reinforcement bonded by the plastic material · CPC title