Cross-linked elastomeric low friction faced synchronous power transmission belt

Patent metadata

Field	Value
Publication number	US-10514083-B2
Application number	US-201615237665-A
Country	US
Kind code	B2
Filing date	Aug 16, 2016
Priority date	Aug 16, 2016
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

A synchronous drive belt includes an outer tension section and opposing continuous tooth section defining an outer surface. The synchronous drive belt further includes a cross-linked elastomeric body, and a tensile reinforcement section disposed between the outer tension section and the cross-linked elastomeric body. A fabric reinforcement is disposed inwardly adjacent the outer surface of the continuous tooth section, and the fabric reinforcement is enveloped by the cross-linked elastomeric body. Further, the cross-linked elastomeric body forms the outer surface of the continuous tooth section. In some aspects, the cross-linked elastomeric body contains a urethane material, which may be formed from the reaction product of a polyisocyanate and a hydroxyl functional polyol during a belt molding process. The polyisocyanate and the hydroxyl functional polyol may envelop the fabric reinforcement prior to reacting during the belt molding process, or even while reacting in the molding process.

First claim

What is claimed is:

1. A synchronous drive belt comprising:
an outer tension section and opposing continuous tooth section defining an outer surface;
a cross-linked elastomeric body formed from reactants consisting of a diisocyanate and a hydroxyl functional polyol;
a tensile reinforcement section disposed between the outer tension section and the cross-linked elastomeric body; and,
a fabric reinforcement disposed inwardly adjacent the outer surface of the continuous tooth section;

wherein the polyisocyanate and the hydroxyl functional polyol are injected to be in contact with the outer tension section, the opposing continuous tooth section, the tensile reinforcement section and the fabric reinforcement, wherein the fabric reinforcement is enveloped by the cross-linked elastomeric body, and wherein the cross-linked elastomeric body forms the outer surface of the continuous tooth section.

2. The synchronous drive belt of claim 1 , wherein the hydroxyl functional polyol is a hydroxyl functional polyether.

3. The synchronous drive belt of claim 2 , wherein the diisocyanate and the hydroxyl functional polyether are reacted during a belt molding process.

4. The synchronous drive belt of claim 3 , wherein the diisocyanate and the hydroxyl functional polyether envelop the fabric reinforcement prior to reacting during the belt molding process.

5. The synchronous drive belt of claim 2 , wherein the diisocyanate and the hydroxyl functional polyether are subject to a temperature of from about 80° C. to about 100° C. during a belt molding process.

6. The synchronous drive belt of claim 2 , wherein the diisocyanate and the hydroxyl functional polyether are injected into a belt mold and reacted during a belt molding process, and wherein the belt mold contains the outer tension section, the tensile reinforcement section and the fabric reinforcement prior to injecting the diisocyanate and the hydroxyl functional polyether.

7. The synchronous drive belt of claim 1 , wherein the fabric reinforcement comprises one or more materials selected from cotton, polyester, polyamide, polyacrylic, polyaramid, nylon, polyketone, polyarylene sulfide, hemp, jute or fiberglass.

8. The synchronous drive belt of claim 1 , wherein the tensile reinforcement section comprises cords formed from one or more materials selected cotton, rayon, nylon, polyester, aramid, steel, carbon, and poly(p-phenylene-2,6-benzobisoxazole (PBO).

9. The synchronous drive belt of claim 1 , wherein the outer tension section comprises one or more materials selected from chloroprene rubber (“CR”), acrylonitrile butadiene rubber (“NBR”), hydrogenated NBR (“HNBR”), styrene-butadiene rubber (“SBR”), alkylated chlorosulfonated polyethylene (“ACSM”), epichlorohydrin, butadiene rubber (“BR”), natural rubber (“NR”), ethylene propylene terpolymer (“EPDM”) and ethylene propylene copolymer (“EPM”).

10. A synchronous drive belt comprising:
an outer tension section and opposing continuous tooth section defining an outer portion;
a cross-linked elastomeric body formed from reactants consisting of a diisocyanate and a hydroxyl functional polyether;
a tensile reinforcement section disposed between the outer tension section and the cross-linked elastomeric body; and,
a fabric reinforcement as part of the outer portion of the continuous tooth section;

wherein the fabric reinforcement is at least partially embedded in the cross-linked elastomeric body; and,
wherein the diisocyanate and the hydroxyl functional polyether are reacted during a belt molding process.

11. The synchronous drive belt of claim 10 , wherein the cross-linked elastomeric body envelops the fabric reinforcement and forms the outer surface of the continuous tooth section.

12. The synchronous drive belt of claim 10 , wherein the diisocyanate and the hydroxyl functional polyether are subject to a temperature of from about 80° C. to about 100° C. during a belt molding process.

13. The synchronous drive belt of claim 10 , wherein the diisocyanate and the hydroxyl functional polyether are injected into a belt mold and reacted during a belt molding process, and wherein the belt mold contains the outer tension section, the tensile reinforcement section and the fabric reinforcement prior to injecting the diisocyanate and the hydroxyl functional polyether.

14. The synchronous drive belt of claim 10 , wherein the fabric reinforcement comprises one or more materials selected from cotton, polyester, polyamide, polyacrylic, polyaramid, nylon, polyketone, polyarylene sulfide, hemp, jute or fiberglass.

15. The synchronous drive belt of claim 10 , wherein the tensile reinforcement section comprises cords formed from one or more materials selected cotton, rayon, nylon, polyester, aramid, steel, carbon, and poly(p-phenylene-2,6-benzobisoxazole (PBO).

16. The synchronous drive belt of claim 10 , wherein the outer tension section comprises one or more materials selected from chloroprene rubber (“CR”), acrylonitrile butadiene rubber (“NBR”), hydrogenated NBR (“HNBR”), styrene-butadiene rubber (“SBR”), alkylated chlorosulfonated polyethylene (“ACSM”), epichlorohydrin, butadiene rubber (“BR”), natural rubber (“NR”), ethylene propylene terpolymer (“EPDM”) and ethylene propylene copolymer (“EPM”).

Assignees

• Contitech Antriebssysteme Gmbh

Inventors

• Gregg Michael
• Lofgren Jeffery

Classifications

• F16G1/10

  with textile reinforcement · CPC title

• B29D29/08

  Toothed driving belts · CPC title

• F16G1/28 Primary

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

• F16G5/20

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

• B29C45/1642

  having a "sandwich" structure (B29C45/1603 takes precedence) · CPC title