The structure of rubber synchronous belt and polyurethane
(1) The glass fiber tensile layer is a rope composed of multiple strands of glass fiber, which is spirally wound on the pitch line of the tape along the width of the tape. It has high strength, small elongation, good corrosion resistance and heat resistance.
(2) Neoprene tape back, which firmly adheres the glass fiber to the node line position, and plays a role of protecting the tensile material; when the belt back is needed in the transmission process, it can prevent damage caused by friction. It has superior hydrolysis resistance and heat resistance than polyurethane belt backs.
(3) Neoprene tape teeth. The belt teeth are composed of neoprene with high shear strength and appropriate hardness. They need precise molding and precise distribution to properly mesh with the tooth grooves of the pulley, and the tooth root must be with the pitch line. Keep the specified distance, the pitch does not change when bending.
(4) Nylon cloth covering layer This is the anti-friction part of the protective tape, which should have excellent wear resistance and is composed of nylon canvas with a small friction coefficient.
The hydrolysis resistance, heat resistance, and impact resistance of neoprene timing belts are better than polyurethane timing belts. Its transmission power range is large. Especially in high-power transmission, polyurethane timing belts cannot be compared with this. The working temperature is generally in the range of -34~100℃.
The structure of polyurethane timing belt is composed of belt back, tensile layer and belt teeth.
(1) The back of the polyurethane belt-backed timing belt is used to bond and wrap the tensile elements. It should have good flexibility and flex fatigue resistance, not easy to age, good oil resistance, and abrasion resistance. On the inner surface of the belt back A sharp-angled groove with a proper size can not only improve the flexural fatigue performance of the toothed belt due to process requirements, but also allow the intercepted air between the belt and the gear teeth to escape during operation to eliminate part of the noise.
(2) Steel wire rope (or polyester cord) Tensile layer The tensile layer is the tensile element of the timing belt, which is used to transmit power and ensure that the pitch of the timing belt remains unchanged during operation. It uses a multi-strand steel wire rope (or polyester cord) to spirally wind the cloth along the width of the tape, and its position is set as the pitch line of the timing belt. The tensile layer must have high tensile strength and bending fatigue strength. The elastic modulus is large, and no elongation is allowed during work, so that the pitch of the timing belt remains unchanged.
(3) Polyurethane toothed polyurethane timing belts should have high shear strength, good wear resistance and oil resistance. The pitch distribution of the belt teeth is required to be very high, and the belt teeth should be correctly meshed with the tooth grooves of the belt wheel. Therefore, the correctness of the geometric parameters of the belt teeth must be strictly required. Polyurethane timing belt is known for its excellent oil resistance and wear resistance. It is suitable for high-speed operation of medium and small power. The environment should be relatively dry. The working temperature is generally -20～+80 C.