Synchronous belt with unidirectional fabric reinforcement
A synchronous belt having a tensile member layer with a tensile member embedded in an elastomeric body, a toothed surface with a plurality of regularly spaced, transverse teeth protruding from the body, a jacket covering the toothed surface, and a unidirectional fabric layer suspended in the belt between the jacket and the tensile member layer and following the approximate contour of the jacket.
1. A synchronous belt comprising:
a tensile member layer having a tensile member embedded in an elastomeric body;
a toothed surface comprising a plurality of regularly spaced, transverse teeth protruding from the body;
a jacket covering the toothed surface; and
a unidirectional fabric layer suspended in the belt between the jacket and the tensile member layer and following the approximate contour of the jacket.
2. The synchronous belt of claim 1 further comprising a cushion layer of elastomeric material residing between said jacket and said unidirectional fabric layer.
3. The synchronous belt of claim 2 wherein said unidirectional fabric layer comprises unidirectional filaments of carbon fiber.
4. The synchronous belt of claim 1 wherein the unidirectional fabric is treated with an adhesive composition.
5. The synchronous belt of claim 4 wherein the adhesive composition comprises a primer material, a polyelectrolyte, and a curative.
6. A synchronous belt comprising:
a tensile member layer having a tensile member embedded in an elastomeric body;
a toothed surface comprising a plurality of regularly spaced, transverse teeth protruding from the body;
a jacket covering the toothed surface; and
a fabric comprising unidirectional carbon fibers suspended in the belt between the jacket and the tensile member layer and with said carbon fibers following the approximate contour of the jacket oriented generally in the longitudinal direction of the belt.
7. A method of making a synchronous belt comprising:
preforming a jacket to fit a grooved mold having grooves matching a desired tooth profile for said belt;
preforming a unidirectional fabric to fit the form of said preformed jacket;
applying said preformed jacket and unidirectional fabric to said mold;
helically winding a tensile cord around said mold over said jacket and unidirectional fabric;
applying a rubber layer over said tensile cord around said mold;
applying heat and pressure to form and cure said jacket, fabric, cord, and rubber layer into a belt sleeve;
cutting said belt sleeve to form individual belts of predetermined width.