Structural composition of rubber timing belt

The structure of neoprene timing belt consists of the following four parts (1) The glass fiber tensile layer is a rope composed of multiple strands of glass fiber, which is spirally wound along the width of the tape at the pitch line position of the tape. (2) Neoprene tape back, which firmly adheres the glass fiber to the position of the pitch line, plays the role of protecting the tensile material; when the belt back is needed during the transmission process, it can prevent damage caused by friction, It has better hydrolysis resistance and heat resistance than polyurethane tape back. (3) Neoprene tape teeth, which are composed of neoprene with high shear strength and appropriate hardness, require precise molding and precise distribution position to properly mesh with the tooth groove of the pulley, and the root of the tooth must be connected to the pitch line Keep the specified distance, and the pitch does not change when bending. (4) Nylon cloth cover layer This is the anti-friction part of the protective tape, which should have excellent wear resistance and be composed of nylon canvas with a small friction coefficient. Neoprene timing belt has better hydrolysis resistance, heat resistance and impact resistance than polyurethane timing belt, and its transmission power range is large. Especially in high-power transmission, polyurethane timing belt can not be compared with this. The working temperature is generally in the range of -34 ~ 100 ℃. The structure of polyurethane timing belt is composed of three parts: belt back, tensile layer and tooth. (1) The back of the polyurethane belt back synchronous belt is used to bond and cover the tensile elements, which should have good flexibility and flexural fatigue resistance, not easy to age, good oil resistance, wear resistance, on the inner surface of the belt back Opening the right-angled groove with appropriate size can improve the flexural fatigue performance of the toothed belt in addition to the process requirements. At the same time, the intercepted air between the belt and the gear teeth can escape during operation to eliminate some noise. (2) Steel wire rope (or polyester wire rope) Tensile layer The tensile layer is the tensile element of the timing belt, used to transmit power and ensure that the pitch of the timing belt does not change 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 determined 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 extension is allowed during operation, so as to ensure that the pitch of the timing belt remains unchanged.