Timing Belts


Part design:

Made with Vulkacit®

Most passenger car engines are built with one or two camshafts at the top of the engine to operate the valves. The camshafts have to be driven from the crankshaft with precise timing. The commonest method of achieving the required precision is by means of a synchronous timing belt. Such belts are made from Therban® with a glass cord reinforcement and a dipped polyamide fabric covering over the teeth. The belt teeth mesh with teeth on the sprockets. Timing belts are exposed to high and low temperatures, high running speed and occasionally to engine fluids such as coolant and gearbox oil. They are nevertheless expected to perform their job for 150,000 km or approximately 2,500 hours of service.

Compound Design
Therban® offers an ideal combination of strength and low dynamic stiffness with resistance to oil, heat, ozone and long term ageing. Sulfur vulcanization is normally employed for timing belts. A low sulfur level with sulfur donors Vulkacit® Thiuram and Rhenocure® M and sulfenamide acceleration (Vulkacit® CZ) gives a heat resistant network. Vulkalent® E is added to delay scorch during processing and accelerate vulcanization in the press. The compound contains a blend of Vulkanox® ZMB 2 and Rhenofit® DDA. The synergistic effect of these two dissimilar antioxidants is exploited to protect the rubber over a working life of several years. Vulkanox® 4020 provides additional ageing protection and protection against ozone attack.

Detailed Information please find using the links below: :

Product: Vulkacit®   


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