FRICTION DRIVE BELT

• US 20110218069A1
• Filed: 10/06/2009
• Published: 09/08/2011
• Est. Priority Date: 10/23/2008
• Status: Active Grant

• Current Assignee: Bando Chemical Industries Limited
• Original Assignee: Bando Chemical Industries Limited
• Inventors: Nakashima, Eijiro, Okuno, Shigeki
• Granted Patent: US 8,882,621 B2
• Time in Patent Office: Days
• US Class Current: 474/260
• CPC Class Codes: F16G 1/08 with reinforcement bonded by the rubber
• CPC Class Codes: F16G 1/28 with a contact surface of special shape, e.g. toothed
• CPC Class Codes: F16G 5/06 with reinforcement bonded by the rubber
• CPC Class Codes: F16G 5/20 with a contact surface of special shape, e.g. toothed

Abstract

A friction drive belt includes: an adhesion rubber layer having a core wire embedded therein so as to form a helical pattern having a pitch in a lateral direction of the belt; a compression rubber layer provided on a surface of the adhesion rubber layer located on an inner side of the belt, and serving as a portion that is to contact pulleys, and a backing rubber layer provided on a surface of the adhesion rubber layer located on an outer side of the belt, and serving as a back portion of the belt. A ratio of tensile stress at 10% elongation of a rubber composition forming the adhesion rubber layer to that of a rubber composition forming the backing rubber layer is 1.77 or more, as measured in a longitudinal direction of the belt at an ambient temperature of 25° C. according to JIS K 6251.

Claims

1. A friction drive belt, comprising:

an adhesion rubber layer having a core wire embedded therein so as to form a helical pattern having a pitch in a lateral direction of the belt;

a compression rubber layer provided on a surface of the adhesion rubber layer located on an inner side of the belt, and serving as a portion that is to contact pulleys, and

a backing rubber layer provided on a surface of the adhesion rubber layer located on an outer side of the belt, and serving as a back portion of the belt, wherein

a ratio of tensile stress at 10% elongation of a rubber composition forming the adhesion rubber layer to that of a rubber composition forming the backing rubber layer is 1.77 or more, as measured in a longitudinal direction of the belt at an ambient temperature of 25°

C. according to JIS K 6251.

2. The friction drive belt of claim 1, wherein

the backing rubber layer has a thickness of 0.3-0.5 mm.

3. The friction drive belt of claim 1, wherein

the backing rubber layer contains no short fibers.

4. The friction drive belt of claim 2, wherein

the backing rubber layer contains no short fibers.