Power transmission belt and its transmission system

Patent metadata

Field	Value
Publication number	US-12467517-B2
Application number	US-202218551966-A
Country	US
Kind code	B2
Filing date	Mar 24, 2022
Priority date	Mar 24, 2021
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

A power transmission belt having a body made of a first elastomeric material, a plurality of cords embedded in the body of the belt, a back and a plurality of ribs or teeth. The back or the ribs or the teeth are covered by a covering material chosen from the group composed of woven fabric and knitted fabric. The covering material includes elastolefin fibres, and preferably at least one elastolefin thread.

First claim

The invention claimed is:

1 . A power transmission belt comprising a body in a first elastomeric material, a plurality of cords embedded in the body of the belt, a back and a plurality of ribs or teeth, said back or said ribs or teeth are covered with a covering material selected from the group consisting of woven fabric, and knitted fabric, characterized in that said covering material comprises elastolefin fibers, which is a fibrous polymer material made of at least 95% by weight of partially cross-linked macromolecules comprising ethylene and another olefin, wherein the elastolefin fibers are elastic in that when elongated by 50%, the fibers return to an original length.

2 . The transmission belt according to claim 1 , wherein the elastolefin fibers form at least one elastolefin thread.

3 . The transmission belt according to claim 2 , characterized in that said covering material is the woven fabric.

4 . The transmission belt according to claim 1 , characterized in that said belt is a toothed belt.

5 . The transmission belt according to claim 3 , characterized in that the woven fabric comprises an elastolefin thread and at least one thread with high thermal and mechanical resistance.

6 . The transmission belt according to claim 5 , characterized in that the at least one high thermal and mechanical resistance thread comprises a polyamide thread.

7 . The transmission belt according to claim 6 , characterized in that said polyamide is an aromatic polyamide.

8 . The transmission belt according to claim 5 , characterized in that the woven fabric comprises the elastolefin thread, two threads with high thermal and mechanical resistance, and an elastic thread.

9 . The transmission belt according to claim 1 , characterized in that said belt is a poly-V belt.

10 . The transmission belt according to claim 9 , characterized in that said covering material is a knitted fabric.

11 . The transmission belt according to claim 10 , characterized in that said knitted fabric is a warp knitted structure.

12 . The transmission belt according to claim 10 , characterized in that said knitted fabric comprises a polyamide thread.

13 . The transmission belt according to claim 10 , characterized in that said knitted fabric comprises a polyamide thread, and a polyester or cotton thread.

14 . The transmission belt according to claim 10 , wherein the elastolefin fibers forms an elastolefin thread, and the knitted fabric comprises the elastolefin thread and an elastic thread.

15 . A power transmission system of a motor vehicle comprising a belt according to claim 1 .

16 . The power transmission system of claim 15 , wherein the belt is a toothed belt or a poly-V belt.

17 . The power transmission system of claim 15 , wherein the covering material is the woven fabric, the elastolefin fibers form an elastolefin thread, and the woven fabric includes a polyamide thread and/or an elastic thread.

18 . The power transmission system of claim 17 , wherein the polyamide thread is an aromatic polyamide thread.

19 . The power transmission system of claim 15 , wherein the covering material is the knitted fabric, the elastolefin fibers form an elastolefin thread, and the woven fabric includes a polyamide thread and/or an elastic thread.

20 . The power transmission system of claim 15 , wherein the covering material is the knitted fabric, the elastolefin fibers form an elastolefin thread, and the woven fabric includes a polyamide thread, and a polyester thread or a cotton thread.

21 . The transmission belt according to claim 11 , characterized in that said warp knitted structure has warp threads that comprise a meta-polyamide thread fiber.

22 . The transmission belt according to claim 21 , characterized in that said warp knitted structure has weft threads that comprise the elastolefin fibers as an elastolefin thread on which a plurality of poly para-aramid threads is wound, wherein the knitted fabric has a tensile strength, before application of a treatment, in the longitudinal direction of the poly-V belt in a range of 700 to 1300 N/25 mm.

23 . The transmission belt according to claim 1 , characterized in that said elastolefin fibers comprises a base for an elastic thread configured to allow the woven fabric or the knitted fabric to extend during vulcanization and avoid discontinuities during the vulcanization process.

Assignees

• Dayco Europe Srl

Inventors

• Gazzaneo Giuseppe
• Nardone Fabio
• Di Carlo Arcangelo
• Piermatteo Carlo
• Di Meco Marco

Classifications

• F16G5/08

  with textile reinforcement · CPC title

• F16G1/28

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

• F16G5/20 Primary

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

• F16G1/10 Primary

  with textile reinforcement · CPC title