Timing Belts (MXL, XL, L, 40DP, T, HTD & GT2)
Timing Belts work to transmit motion between pulleys on separate shafts. They are like chains, but do not require lubrication and provide long life with quiet operation. Timing belts are composed of a tension member with s-z twist, the body material, and sometimes a protective layer on the belt’s teeth. The tension member is what provides the resistance to elongation when tension is applied to drive pulleys and is usually made of fiberglass, polyester, Kevlar, or steel. The backing protects the belt from dirt, grime, oil, and moisture and is usually made of neoprene or polyurethane, but also made from natural rubber and other polymers. The custom timing belt’s teeth are molded surrounding the tension member, and are made from a shear-resistant material that will transmit power between the pulley and the belt. When the custom timing belt are made from neoprene, the teeth are usually covered in a nylon jacket to provide wear resistance and increase belt life.
In an ideal system, the center distance between pulleys will be adjustable, so that the tension in the timing belt can be adjusted without the use of an idler. While an idler may be used in a synchronous pulley and belt system, it will cause a reduction in the belt’s life when compared to a system without the idler and adjustable center distance instead. This is because the idler introduces more bending in the belt.
Custom Timing Belts
Custom timing belts are available in the same profiles and sizes as timing pulleys, and with a range of teeth. In shorter lengths, belts with nearly all consecutive number of teeth are readily available. Longer belts are not made in as large a variety of lengths and number of teeth.
Beyond choosing a custom belt width, customization of belts is not recommended unless for very specific application requirements such as environmental, material, and other requirements.