Hycote Workshop Belt Slip, 400 ml

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The relative motion on the pulleys, which is always present due to the elasticity of the belt, is called elastic slip! Elastic slip The belt adapts to the different speeds by elastic slip on the pulleys! Circumferential speed of the pulleys There is a wide variety of reasons V-belts and pulleys slip. Some important reasons are: Worn pulleys The higher the circumferential forces to be transmitted and the more elastic the belt is (e.g. low Young’s modulus!), the greater the elastic slip. With the increased elastic slip, the sliding zone also includes a larger portion of the wrap angle. Figure: Increase in elastic slip with increase in circumferential force

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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? 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). 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] 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 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: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!

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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]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. The figure below shows schematically the distribution of the speed along the belt according to the animation above. Figure: Speed distribution along the belt 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.

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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)! Equation (\ref{4367}) also shows that if no circumferential force is transmitted (F c=0) there is no sliding zone (ln(1)=0!) but only an adhesion zone. With the transmission of a circumferential force, however, a sliding zone is created which increases with increasing circumferential force. As a result, the elastic slip also increases.The exact relationship between elastic slip S and circumferential force F c to be transmitted is to be derived in the following sections. Note that in this case it is not, as previously always assumed, the static limit case in which the belt is not yet slipping. Rather, slipping is already present from the very beginning due to the elastic slip (µ s as coefficient of sliding friction!).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. 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!):

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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. The reduction in peripheral speed between the driving pulley and the driven pulley is directly relatet to a loss in power, because a decrease of the circumferential speed v at a transmitting circumferential force F c means a direct decrease in power according to the P=F c⋅v.

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With the definition of the elastic slip S as the ratio of speed loss Δv and circumferential speed of the input pulley v i, the following formula applies v o: circumferential speed of the output pulley): The elastic slip influences the belt speed and thus the power but not the circumferential force or the torque! 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): Sliding slip is the complete sliding of the belt over the entire pulley in the event of overload (complete relative motion between belt and pulley)! Belt speeds 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!