Its advanced silicone synthetic formula is safe for use on metal, rubber, wood, and vinyl and also protects electrical parts and is perfect for wet environments and marine use. It's also NSF H2 registered making it safe for use in food-related environments.

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Thus, the elastic slip S can also be determined by the power loss ΔP with respect to the power P i at the input pulley:

The entire wrap area φ can therefore be divided into two zones. In the co-called sliding zoneφ’ a relative motion takes place between belt and pulley. With the acting sliding friction, this zone ensures the transmission of the circumferential force. In the remaining adhesion zone, the belt adheres to the pulley without a relative motion and without force transmission. Since the circumferential speeds can also be expressed by the rotational speeds n and pulley diameters d (v=π⋅d⋅n), the elastic slip can also be determined as follows: The higher the circumferential forces to be transmitted and the more elastic the belt is, the higher the elastic slip!

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The more the belt stretches, i.e. the greater the elastic slip, the greater the difference in belt speeds and thus also in the circumferential speeds of the pulleys. Therefore, the elastic slip S can be defined by the relative loss of speed at the circumference of the input pulley (v i) and the output pulley (v o): The belt adapts to the different speeds by elastic slip on the pulleys! Circumferential speed of the pulleys As can be seen from the animation below, the belt is running more and more ahead due to the increasing stretching on the driven pulley. This means that the speed of an imaginary point on the belt is always slightly higher than the peripheral speed of the pulley. This corresponds to the relative motion between belt and pulley described above.Conversely, the belt section coming from the tight side (and thus maximally stretched up) contracts during rotation around the driving pulley due to the decreasing belt force. The belt shrinks on the driving pulley, so to speak, and thus also results in relative motion and thus in sliding. In addition to elastic slip, which is due to the elasticity of the belt, the belt can also slip completely over the entire driven pulley in the event of overload. This is then referred to as sliding slip.Note that every belt has a certain elasticity and therefore always results in elastic slip, whereby sliding slip should always be avoided. Suitable for us on a broad range of different belts and bands, including leather, rubber and fabric, Belt Dressing spray stops slipping instantly. This long-lasting spray is available in boxes of 12 handy 400ml cans. Note that the relative motion around the pulley is constantly increasing as the belt increases its speed more and more in accordance with the increasing elongation (condition of continuity!), but the pulley has a constant circumferential speed. This means that the belt speed and the peripheral speed of the pulley are only equal when the belt runs onto the driven pulley, otherwise the belt speed will be higher or the pulley speed lower.

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S = \frac{\epsilon_t-\epsilon_s}{1+\epsilon_t} = \frac{\frac{F_t}{E \cdot A}-\frac{F_s}{E\cdot A}}{1+\frac{F_t}{E\cdot A}} = \frac{F_t-F_s}{E \cdot A+F_t}\\[5px] i sprayed some wd40 on the drive and air con belt, i think it helped a bit, but the noise is still there. i know that there is a special spray for squeeky drive belts, do these work well? Such (elastic) stretching or shrinking processes of the belt on the pulleys, which inevitably lead to relative motion, are also called elastic slip. From the belt’s point of view, elastic slip should always be kept as low as possible, otherwise enormous belt wear will occur due to the strong relative motion. The surfaces of pulleys must therefore not be too rough, as one might misleadingly assume due to the increased static friction on rough surfaces! There is a wide variety of reasons V-belts and pulleys slip. Some important reasons are: Worn pulleysAt the input pulley, the power P i=F c⋅v i is first transferred to the belt. The power reduced by the amount of the elastic slip (P o=F c⋅v o) is then taken from the output pulley. The difference in power corresponds to the power loss ΔP due to the stretching and shrinking processes of the belt (related to heating of the belt!): i took it from london to manchester yesterday, around a 200mile drive, and found that when i got there, i started to get a squealing-screeching noise when i accelerate on first and second gear.