A composite material for a transmission belt includes an elastomer matrix forming a basic component of the material. There is included a cross-linking system of the elastomer matrix and at least one fiber reinforcement including fibers with a maximum length of about 30 mm. The fibers are disposed throughout the elastomer matrix and are generally oriented to extend in a first direction of reinforcement. There is at least one thermosetting resin in the elastomer matrix. The elastomer matrix which includes the cross-linking system, the fiber reinforcement and the thermosetting resin has a first equivalent tensile modulus which is calculated for a hypothetical elongation of 100% in the first direction and a second equivalent tensile modulus which is calculated for an actual or hypothetical elongation of 100% in a second direction which is perpendicular to the first direction. A second equivalent tensile modulus is at least 6 MPa. Anisotropy ratio of the first equivalent tensile modulus and the second equivalent tensile modulus is at least 6. The elastomer matrix forming the basic component is in at least one layer within the transmission belt which includes a longitudinal axis. The first direction of reinforcement of the at least one layer is perpendicular to the longitudinal axis.
Disclosed is a short fiber-reinforced rubber wherein a fibrilated polyacrylonitrile short fiber is uniformly dispersed in a rubber, and a process for producing the same.
A power transmission belt having a body with a length, an inside surface, an outside surface, and laterally spaced side surfaces. A plurality of laterally extending, discrete fibers are embedded in the body and have portions projecting from at least one of the side surfaces of the body. The side surfaces make with each other an angle of 42.degree.-50.degree..
A low modulus drive belt for an automotive accessory drive system is disclosed that allows for relatively high elongation during installation and that maintains a relatively high percentage of its install tension throughout the useful life of the belt. In addition, an automotive accessory drive system is taught that utilizes such a belt as is a method for constructing such a belt. According to one aspect an accessory drive system for an automobile is provided that includes: (a) a drive pulley; (b) an accessory pulley operatively coupled to an accessory drive shaft; and (c) an endless drive belt engaged between the drive pulley and the accessory pulley, where the drive belt includes an endless band of rubber composite material having a plurality of circumferentially extending an axially aligned polyamide 6.6 twisted cords formed therewithin.
The invention provides a low modulus drive belt for an automotive accessory drive system that allows for relatively high elongation during installation and that maintains a relatively high percentage of its install tension throughout the useful life of the belt. The invention also provides an automotive accessory drive system that utilizes such a belt and a method for constructing such a belt. One embodiment of the invention is directed to an accessory drive system for an automobile that includes: (a) a drive pulley; (b) an accessory pulley operatively coupled to an accessory drive shaft; and (c) an endless drive belt engaged between the drive pulley and the accessory pulley, where the drive belt includes an endless band of rubber composite material having a plurality of circumferentially extending an axially aligned polyamide 6.6 twisted cords formed therewithin.
A vibration-insulative support member includes an elastic body made mainly of rubber, and a pair of upper and lower flanges secured to upper and lower ends of said elastic body, respectively. The elastic body includes cords disposed in the rubber portion of the elastic body. The cords are arranged in layers substantially parallel to the upper and lower flanges in such a manner that the cords in each layer are distributed in a plan substantially parallel to the upper and lower flanges.
