Flat transmission belt

• US 20090029818A1
• Filed: 05/15/2006
• Published: 01/29/2009
• Est. Priority Date: 05/16/2005
• Status: Abandoned Application

• Current Assignee: Bando Chemical Industries Limited
• Original Assignee: Bando Chemical Industries Limited
• Inventors: Takahashi, Osamu
• Application Number:
  US11/920,479
• Publication Number:
  US 20090029818A1
• Time in Patent Office: Days
• US Class Current: 474/263
• CPC Class Codes: F16G 1/08 with reinforcement bonded by the rubber

Abstract

There is provided a flat transmission belt that suppresses occurrence of cracks in the belt surfaces to extend the life of cover rubber layers and hence the life of the belt as a whole. A flat transmission belt of the present invention has a first cover rubber layer and a second cover rubber layer formed on a side of the belt opposite to the side on which the first cover rubber layer is formed, and is wound between driving and driven pulleys when in use. The first cover rubber layer and the second cover rubber layer are respectively formed of rubber materials that are of the same kind but differ in mixing ratio of the components thereof, and the first cover rubber layer, which contacts a smaller number of the driving and driven pulleys, has an extension ratio higher than the extension ratio of the second cover rubber layer, which contacts a larger number of the driving and driven pulleys.

Claims

1. :

A flat transmission belt, the transmission belt having a first cover rubber layer and a second cover rubber layer on a side of the flat transmission belt opposite to the side on which the first cover rubber layer is formed, and is wound between driving and driven pulleys when in use, wherein the first cover rubber layer and the second cover rubber layer are respectively formed of rubber materials that are of the same kind but differ in mixing ratio of the components thereof; and

the first cover rubber layer, which contacts a smaller number of the driving and driven pulleys, has an extension ratio higher than the extension ratio of the second cover rubber layer, which contacts a larger number of the driving and driven pulleys.

2. :

The flat transmission belt according to claim 1, wherein the rubber materials each contain short fibers and the short fibers contained in the rubber material of the first cover rubber layer is smaller in amount than the short fibers contained in the rubber material of the second cover rubber layer.

3. :

The flat transmission belt according to claim 1, wherein the rubber materials each contain filler and the filler contained in the rubber material of the first cover rubber layer is smaller in amount than the filler contained in the rubber material of the second cover rubber layer.

4. :

The flat transmission belt according to claim 1, wherein the rubber hardness of the first cover rubber layer is smaller than that of the second cover rubber layer.

5. :

The flat transmission belt according to claim 4, wherein the rubber hardness of the second cover rubber layer is 70-98 and the rubber hardness of the first cover rubber layer is 3-10 smaller than the rubber hardness of the second cover rubber layer in the rubber hardness test according to JIS K6253.

6. :

The flat transmission belt according to claim 1, wherein the rubber elastic modulus of the first cover rubber layer is smaller than that of the second cover rubber layer.