Poly-V belt comprising a layer of thermoplastic material and a knitted fabric embedded in an elastomeric layer

Patent metadata

Field	Value
Publication number	US-9394968-B2
Application number	US-201314399223-A
Country	US
Kind code	B2
Filing date	May 9, 2013
Priority date	May 9, 2012
Publication date	Jul 19, 2016
Grant date	Jul 19, 2016

Abstract

Poly-V belt comprising a body made of elastomeric material, preferably EPDM, a plurality of threadlike resistant inserts longitudinally embedded in the body, and a coupling portion integrally connected to the body and comprising a plurality of V-shaped ribs arranged side by side and alternated with V-shaped grooves. According to the present invention the belt comprises a layer of a thermoplastic material which covers the ribs at least partially, and a layer of elastomeric material in which a knitted fabric is embedded. The layer of elastomeric material is above and in contact with the thermoplastic material.

First claim

The invention claimed is:

1. A poly-V belt ( 1 ) comprising a body ( 2 ) comprising a first elastomeric material, a plurality of threadlike resistant inserts ( 3 ) longitudinally embedded in the body, and a coupling portion ( 4 ) integrally connected to the body ( 2 ) and comprising a plurality of V-shaped ribs ( 5 ) arranged side by side and alternated to V-shaped grooves ( 6 ), said belt comprising:
a layer of thermoplastic material ( 8 ) which at least partially covers said ribs ( 5 ) and a layer comprising a second elastomeric material ( 9 ) in which a fabric is immersed ( 10 ), said layer of second elastomeric material being directly in contact with said layer of thermoplastic material ( 8 );
wherein said second elastomeric material is present between the fabric and the first layer of thermoplastic material, thereby preventing contact between the fabric and the thermoplastic material.

2. The belt ( 1 ) according to claim 1 , characterised in that said fabric is selected from the group consisting of woven fabric, knitted fabric and non-woven fabric.

3. The belt ( 1 ) according to claim 1 , characterised in that said first elastomeric material is an ethylene alpha-olefin elastomer.

4. The belt ( 1 ) according to claim 3 , characterised in that said ethylene alpha-olefin elastomer is EPDM.

5. A belt ( 1 ) according to claim 1 , characterized in that said thermoplastic material comprises a polyolefin.

6. A belt ( 1 ) according to claim 1 , characterized in that said thermoplastic material comprises a polyethylene homo or copolymer.

7. The belt ( 1 ) according to claim 6 , characterised in that said polyethylene is selected from the group consisting of LDPE, LLDPE, UHMWDPE or mixtures thereof.

8. The belt ( 1 ) according to claim 6 , characterised in that said thermoplastic material has a thickness in the range between 30 μm and 200 μm.

9. The belt ( 1 ) according to claim 1 , characterised in that said second elastomeric material is an ethylene alpha-olefin elastomer.

10. The belt ( 1 ) according to claim 9 , characterised in that said second elastomeric material is EPDM.

11. The belt ( 1 ) according to claim 1 , characterized in that said layer of second elastomeric material ( 9 ) has a thickness in the range between 100 and 300 μm.

12. The belt ( 1 ) according to claim 1 , characterised in that said knitted fabric has an interlock configuration.

13. The belt ( 1 ) according to claim 1 , characterised in that said knitted fabric has a weight in the range between 50 and 100 g/m 2 .

14. A process for producing a transmission belt according to claim 1 comprising the steps of:
applying said layer of thermoplastic material on a surface of elastomeric material before a vulcanising step;
applying a layer of elastomeric material containing said knitted fabric in direct contact with said layer of thermoplastic material; and
vulcanising under pressure to mould said belt.

15. A poly-V belt comprising:
a body comprising a first elastomeric material, a plurality of threadlike resistant inserts longitudinally embedded in the body, and a coupling portion integrally connected to the body, the coupling portion comprising a plurality of V-shaped ribs arranged side by side and alternated to V-shaped grooves; and
a first layer of thermoplastic material, which at least partially covers said plurality of V-shaped ribs; and
a second layer comprising a second elastomeric material in which a fabric is immersed, said layer of second elastomeric material being directly in contact with said first layer of thermoplastic material;
wherein said second elastomeric material is present as an outermost surface of said plurality of V-shaped ribs;
wherein said second elastomeric material is present between the fabric and the first layer of thermoplastic material, thereby preventing contact between the fabric and the thermoplastic material.

Assignees

• Dayco Europe Srl

Inventors

• Di Carlo Arcangelo
• Petaccia Marino
• Perfetti Gianluca
• Di Meco Marco

Classifications

• B29D29/10

  Driving belts having wedge-shaped cross-section · CPC title

• B29K2023/16

  EPM, i.e. ethylene-propylene copolymers; EPDM, i.e. ethylene-propylene-diene copolymers; EPT, i.e. ethylene-propylene terpolymers · CPC title

• B29K2023/0625

  LLDPE, i.e. linear low density polyethylene · CPC title

• F16G5/20 Primary

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

• F16G5/14 Primary

  with reinforcement bonded by the plastic material · CPC title