Abstract
Reinforcement of the tooth belts is the element responsible for the transmission of the torque. Its structure is related to the dynamics of the belt and such important parameters as the stiffness of running stability on pulleys and above all, the pitch stability. The axis of symmetry of the reinforcement in the vertical direction of the belt is the reference point of the belt geometry as well as the neutral axis of stresses caused by bending. On the arc of the contact between belt and pulley, over the reinforcement, the belt is stretched, and below it is compressed. In the tooth belts, there are various solutions of the carrier layer, in terms of the materials used, but also types of fibers, quantity of the fibers, etc. The paper presents the results of analysis of the carrier layer of the most popular tooth belts with T10 and AT10 trapezoidal teeth. The paper shows possible direction of choice of the construction materials of the carrier layer and their importance for the dynamics of the gear with the tooth belt.
Highlights
The timing belt as a construction composite is a heterogeneous material
Due to the fact that the article deals with issues related to the carrier layer, the consideration of tooth geometry will be omitted
The carrying layer during belt operation is subjected to complex loads and mechanical, thermal, chemical and physical phenomena, such as: extensions in the elastic stress area of the active cord, elastic return on the idler, bending on the wheel, twisting of individual wires and fibers, friction between individual wires / fibers, internal intermolecular friction, friction between the carrier layer and the belt material, breaking of single wires causing in result an excessive load on the others, thermal expansion caused by internal and external friction, as well as belt operating temperature, degradation caused by the presence of moisture and an aggressive environment
Summary
The timing belt as a construction composite is a heterogeneous material. Its main mechanical properties depend on the properties of the reinforcement and the body (Fig. 1). The reinforcement otherwise the support layer/fabric or tension cord is responsible for the mechanical strength of the belt and its correct work [1]. The proper work of the timing belt, especially in the area of meshing with the pulley, guarantees the correct tooth geometry and pitch stability. Precise positioning in a certain accuracy requires a proper pitch clearance, because the belt works in two directions. In the case when the belt is subjected to additional processing, e.g. perforation, we obtain additional properties whose workmanship significantly affects both the geometry of the belt and the quality of work. The perforation process itself significantly affects the quality of the holes in the timing belt that performs the conveyor functions, and indirectly influences on the strength and durability of the belts [5, 6]
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