Friction transmission belt

Patent metadata

Field	Value
Publication number	US-9702434-B2
Application number	US-201414465617-A
Country	US
Kind code	B2
Filing date	Aug 21, 2014
Priority date	Feb 24, 2012
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A friction transmission belt includes short fibers arranged so as to protrude from a surface of a pulley contact-side part made of a rubber composition. The short fibers consist of aramid short fibers and non-aramid synthetic short fibers having a standard moisture regain of equal to or less than 4%.

First claim

What is claimed is:

1. A friction transmission belt comprising:
short fibers arranged so as to protrude from a surface of a pulley contact-side part made of a rubber composition,
wherein the short fibers comprise aramid short fibers and polyester short fibers, at least some of the aramid short fibers and polyester short fibers comprise protruding parts that protrude from the surface of the pulley contact-side part, and
a length of the protruding parts of the aramid short fibers is longer than the protruding parts of the polyester short fibers.

2. The friction transmission belt of claim 1 , wherein
an area occupancy of the short fibers at the surface of the pulley contact-side part is 40 to 99%.

3. The friction transmission belt of claim 1 , wherein
an area occupancy of the aramid short fibers at the surface of the pulley contact-side part is 30 to 80%.

4. The friction transmission belt of claim 1 , wherein
an area occupancy of the polyester short fibers at the surface of the pulley contact-side part is 15 to 65%.

5. The friction transmission belt of claim 1 , wherein
a ratio of the area occupancy of the aramid short fibers at the surface of the pulley contact-side part to the area occupancy of the polyester short fibers at the surface of the pulley contact-side part is 0.1 to 10.

6. The friction transmission belt of claim 1 , wherein
the aramid short fibers include para-aramid short fibers and meta-aramid short fibers.

7. The friction transmission belt of claim 1 , wherein
the rubber composition forming the pulley contact-side part contains the short fibers.

8. The friction transmission belt of claim 7 , wherein
a mixing amount of the short fibers with respect to 100 parts by mass of a rubber component of the rubber composition forming the pulley contact-side part is 10 to 85 parts by mass.

9. The friction transmission belt of claim 7 , wherein
a mixing amount of the aramid short fibers with respect to 100 parts by mass of the rubber component of the rubber composition forming the pulley contact-side part is 2 to 25 parts by mass.

10. The friction transmission belt of claim 7 , wherein
a mixing amount of the polyester short fibers with respect to 100 parts by mass of the rubber component of the rubber composition forming the pulley contact-side part is 5 to 60 parts by mass.

11. The friction transmission belt of claim 7 , wherein
the mixing amount of the aramid short fibers with respect to 100 parts by mass of the rubber component of the rubber composition forming the pulley contact-side part is less than the mixing amount of the polyester short fibers with respect to 100 parts by mass of the rubber component of the rubber composition forming the pulley contact-side part.

12. The friction transmission belt of claim 1 , wherein
the rubber composition forming the pulley contact-side part contains a filler.

13. The friction transmission belt of claim 12 , wherein
a mixing amount of the filler with respect to 100 parts by mass of the rubber component of the rubber composition forming the pulley contact-side part is 10 to 70 parts by mass.

14. The friction transmission belt of claim 12 , wherein
the filler is sheet silicate.

15. The friction transmission belt of claim 1 , wherein
the length of the protruding parts of the aramid short fiber is 0.05 to 5 mm.

16. The friction transmission belt of claim 1 , wherein
the length of the protruding parts of the polyester short fibers is preferably 0.01 to 2 mm.

17. The friction transmission belt of claim 1 , wherein
a length ratio of the protruding parts of the aramid short fibers to the protruding parts of the polyester short fibers is 1 to 10.

18. The friction transmission belt of claim 1 , wherein
the aramid short fibers are formed so as to have a length longer than a length of the polyester short fibers.

Assignees

• Bando Chemical Ind

Inventors

• Takahashi Shinji
• Okubo Takayuki
• Takano Yasuhiro
• Tachibana Hiroyuki
• Noguchi Tadahiko

Classifications

• C08L23/16

  Ethylene-propylene or ethylene-propylene-diene copolymers · CPC title

• F16G5/20

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

• C08L77/00

  Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain (of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08); Compositions of derivatives of such polymers · CPC title

• B29D29/106

  Cogged driving belts · CPC title

• F16G5/08 Primary

  with textile reinforcement · CPC title