Derivation of the relationship between tensile strength, contact angle and friction coefficient of a V-type belt
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- 11 For the belt drive in Problem 10, what is the transmitted torque (in lbf"in) in the smaller pulley? Assume that both service factor Kg and safety factor nd are equal to 1.0. OA. 220 OB. 126 OC. 84 OD. 56 OE. None of the abovestatic of rigid bodies problemThe factor of safety against slipping in the friction clutch = 1.3; coefficient of friction=0.4;working speed= 600 rpm; friction surface number= 2; required closing force= 712 N, clutch outerIf diameter = 300 mm, clutch inner diameter = 120 mm, how much power is transmitted?
- Q9/ A V-belt drive consists of three V-belts in parallel on grooved pulleys of the same size. The angle of groove is 30° and the coefficient of friction 0.12. The cross-sectional area of each belt is 800 mm2 and the permissible safe stress in the material is 3 MPa. Calculate the power that can be transmitted between two pulleys 400 mm in diameter rotating at 960 rpm.Q9/ A V-belt drive consists of three V-belts in parallel on grooved pulleys of the same size. The angle of groove is 30° and the coefficient of friction 0.12. The cross-sectional area of each belt is 800 mm? and the permissible safe stress in the material is 3 MPa. Calculate the power that can be transmitted between two pulleys 400 mm in diameter rotating at 960 rpm.4) In a single plate clutch both sides are effective. The clutch transmits 10 Kw power. The maximum torque is 120 Nm, the maximum axial force should not be more that 100 KN/m2. The outer diameter of the clutch plate is 1.3 times of the inner diameter. Find out the axial load exerted by the spring and outer and inner diameters of the clutch plate.
- In a lamella clutch, the number of inner lamellae zi= 5 pieces, the number of outer lamellas zd=6 pieces. If the inner radius of the lamella is ri=70mm, the radius of the outer lamella is rd=120mm, the surface safety pressure of the lamella material is pem =0.8 MPa, the friction coefficient is u=0.1, what is the maximum power that the clutch can carry at n=120 rpm?Q3 /A multi - plate clutch is to transmit 12 kW at 1500 r.p.m. The inner and outer radii for the plates are to be 50 mm and 100 mm respectively. The maximum axial spring forces is restricted to 1 kN. Answer the following questions 1- The necessary number of pairs of surfaces is u= 0.35 assuming constant wear. 2- The necessary number of pairs of surfaces is constant pressure. u= 0.18 assuming 3- The axial force 4- Percentage increase in forces isQuestion (2) The followings are the compression spring particulars in slip clutch unit. You are asked to:- Axial force Spring mean Diameter 25 mm Compression Spring Particulars Og of SAE 6150 O, of Cr-Mo-Ni Steel 1600 MPa 1400 MPa 8 FDK 1000 N Spring index Shear stress in spring wire 5 8 FD3N Y= Gdt No. of active turns, N Modulus of rigidity of spring material, G Spring deflection 10 8 x 10* MPa Wahl factor, K 1.3 1. Calculate the shear stress in spring wire. 2. Choose the suitable spring material. . 3. Calculate the spring stiffness. 4. Determine the spring length in the system in working condition if the spring free length is 100 mm. 5. Recalculate the shear stress in spring wire if the axial force increases to 2000 N without changing the spring material (obtained in no. 2). Comment on your results.
- ! Required information A helical coil compression spring is needed for food service machinery. The load varies from a minimum of Fmin 4 lbf to a maximum of Fmax 16 lbf. The spring rate k is to be 9.5 lbf/in. The outside diameter of the spring cannot exceed 2.5 in. The spring maker has available suitable dies for drawing 0.08-in-diameter wire. Use a fatigue design factor nfof 1.5 and the Gerber-Zimmerli fatigue-failure criterion. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Determine the values for each of the following for a value of 0.08 in: The torsional modulus of rupture, Ssu, is 163.7 kpsi. Torsional yield strength, Ssy, is 85.5 kpsi. The endurance strength, assuming unpeened spring wire, Sse, is The value of the mean diameter, D, is 0.662 ✔ in. shear stress, Ta, is The fatigue factor of safety, nf, is The free length, Lo, is The critical length, LO(cr), is The alter 1.32 x in. in. kpsi. 39.5 kpsi.Q3 / A multi – plate clutch is to transmit 12 kW at 1500 r.p.m. The inner and outer radii for the plates are to be 50 mm and 100 mm respectively. The maximum axial spring forces is restricted to 1 kN. Answer the following questions 1- The necessary number of pairs of surfaces is µ= 0.35 assuming constant wear. 2- The necessary number of pairs of surfaces is constant pressure. µ= 0.18 assuming 3- The axial force 4- Percentage increase in forces isQ1/ A plate clutch having a single driving plate with contact surfaces on each side is required to transmit 110 kW at 1250 r.p.m. The outer diameter of the contact surfaces is to be 300 mm. The coefficient of friction is 0.4. (a) Assuming a uniform pressure of 0.17 N/mm? ; determine the inner diameter of the friction surfaces. (b) Assuming the same dimensions and the same total axial thrust, determine the maximum torque that can be transmitted and the maximum intensity of pressure when uniform wear conditions have been reach.