At 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!):

Belt slippage basics – Vulcan Grip® Belt slippage basics – Vulcan Grip®

Actually, No! WD40 is a water dispersant and NOT a repellant! It does not contain the ingredients to repel water as wax or silicone would. Negative wetting angles and all that... sounds to me like the belt has stretched slightly and dried on the long journey. My timing belt, fan belt and air-con belt was changed last may, however, since then, i havent done a long journey like this with my air-con switched on, on the motorway. 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):i also found that the problem of the noise tends to happen 'more' when my air-conditioning is switched on, rather than just the cool air in the cabin. The strains ε can be determined as follows using the Young’s modulus E of the belt (not to be confused with the bending modulusE b!) and the acting belt stresses σ=F/A (with A as cross-sectional area of the belt): My daughter's Audi A1 has damp in the driver's footwell but the door seals seem fine, what could be the cause?

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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] The belt adapts to the different speeds by elastic slip on the pulleys! Circumferential speed of the pulleys The sliding angle φ’ relevant for power transmission can also be expressed by the circumferential force F c to be transmitted. Thus follows with F c=F t-F s or F t=F c+F s: In the animation below, additional marking lines are attached to the pulleys for better orientation. If one compares these pulley markings with the belt markings, the relative motion between belt and pulley can be seen very clearly. Animation: Stretching and shrinking of the belt around the pulleys The relative motion on the pulleys, which is always present due to the elasticity of the belt, is called elastic slip (partial relative motion between belt and pulley)!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. 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: If a belt section between two marking lines is now looked at more closely, this section is obviously stretched on the driven pulley during rotation. The stretching belt section is pulled over the pulley, so to speak, i.e. there is relative motion between belt and pulley and thus sliding! There is a wide variety of reasons V-belts and pulleys slip. Some important reasons are: Worn pulleys The figure below shows schematically the distribution of the speed along the belt according to the animation above. Figure: Speed distribution along the belt

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For decreasing the likelihood slips as well as increasing belt torque and pull power, our Belt Dressing spray is the perfect tool for the job. The peripheral speed of the driven pulley is lower than that of the driving pulley! The relative loss of speed in comparison to the driving pulley is a measure of the elastic slip! Belt Dressing Spray is completely insoluble in water, making it equally effective in damp or wet environments. The Halfords Silicone Spray Lubricant is ideal for use on weather strips, mouldings, trim, rubber doors & window seals.

Special

With one of the widest portfolios of food grade lubricants in the market, ROCOL's FOODLUBE and NSF registered products hold ISO 21469 certification, Halal, Kosher and Vegan approvals and accreditations that help meet food industry requirements! The relative motion on the pulleys, which is always present due to the elasticity of the belt, is called elastic slip! Elastic slip 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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Our experience and expertise in product development means our advanced technology keeps your equipment maintained to the highest standard to ensure production runs effectively and efficiently! S =\frac{\Delta v}{v_i} = \frac{v_i-v_o}{v_i} = \frac{v_t-v_s}{v_t} = \frac{(1+\epsilon_t) – (1+\epsilon_s)}{1+\epsilon_t} = \frac{\epsilon_t-\epsilon_s}{1+\epsilon_t} \\[5px] So if the driving pulley generally moves faster than the belt and the driven pulley is slower, then the circumferential speeds of the pulleys are obviously no longer identical (this would only be the case with a complete inelastic belt).This ultimately results in a loss of circumferential speed between the drive pulley (rotating faster than the belt) and the output pulley (rotating slower than the belt). Delta P = P_i – P_o = F_c \cdot v_i –F_c \cdot v_o = F_c \cdot \underbrace{(v_i-v_o)}_{=v_i \cdot S} = F_c \cdot v_i \cdot S = P_i \cdot S \\[5px] As already explained in the section Belt speeds, the belt strains ε and the belt speeds v are directly interrelated. Mathematically this can be expressed as follows:As well as increasing efficiency it can help reduce wear and tear of belts. Suitable for use with flat, ‘V’, round, rubber, leather and fabric belts. Note: In the previous articles on belt drives, the sliding anglewas equated with the wrap anglefor reasons of conservative calculations. The statements made must then always be interpreted at the limit to sliding slip! Calculation of the elastic slip 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.