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

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

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Q1/ 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.
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 is
1- A single plate clutch with both sides of the plate effective is required to transmit 25 kw at 100 r.p.m. the outer diameter of the plate is Limited to 300 mm and the intensity of pressure between the plates not to exceed 0.07 N/mm? . Assuming uniform wear and coefficient of the friction 0.3 , find the inner diameter of the plates and the axial force necessary to engage clutch . chaft
Q2/ A dry single plate clutch is to be designed for an automotive vehicle whose engine is rated to give 100 kW at 2400 r.p.m. and maximum torque 500 N-m. The outer radius of the friction plate is 25% more than the inner radius. The intensity of pressure between the plate is not to exceed 0.07 N/mm?. The coefficient of friction may be assumed equal to 0.3. The helical springs required by this clutch to provide axial force necessary to engage the clutch are eight. If each spring has stiffness equal to 40 N/mm, determine the dimensions of the friction plate and initial compression in the springs
Q2/ A dry single plate clutch is to be designed for an autontotive vehicle whase engine is ated to give 100 &W at 2400 r.p.M. and marimum torque 500 N-m. The outer radus of the friction plate is 25% ore than the inner radius, The intensity of pressure berween the plate is not to exceed 0.07 N/mm. The coefficient of friction may be assamed egual t0 0.3 The helical springs reguired by this cluich to provide axial force mecessary to engage the clutch are eight. If cach spring has stiffness equal to 40 N/mm, derermine the dimensions of the friction plate and initial compression in the springs
Example: An automotive single-plate clutch with twe of friction Surfaces, transmits a 300 N-m to- pairs rque at 1500 rp.m. The inner and outer diameters of the friction disck are 170 and 270 mm The cofficient of friction is 0-35. The normal for- ce on the friction Surfaces is exerted by nine helical Compre ssion springs, so that the clutch is always engia- ged. The clutch is dis engaged when the external force Further Compresses (5) and the number of ac Five Coile are (6) The are made of patented and Cold-drawn steel respectively. the springs. The spring index is Springs wires of minimum tensile Stmength (MTS) (N/mm?)as Wive dia. 1 1-21-4 1.6 1-8 2 2.53 3.6445567 MTS, 1900 i2601817e0175017201640 1570 I510 1480 440 139013201260 NI mr The permissible shear stress for the wire is 30%. of the ultimate tensile strength, and (G-81370 Nimn). Design the springs and specily their dimensisns. Use this relatian to obtaine to the total normal fore required to transmit the torque. F= 4T where Dis…
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.
H.W (3): A multi-disc clutch has three discs on the driving shaft and two on the driven shaft. The outside diameter of the contact surfaces is 240 mm and inside diameter 120 mm. Assuming uniform wear and coefficient of friction as 0.3, find the maximum axial intensity of pressure between the discs for transmitting 25 kW at 1575 r.p.m. Ans. : p = 0.062 N/mm2
Q2 ) A cone clutch is to transmit 10 KW at 600 r.p.m. the cone has a face angle of 10° The width of the face is halfe of the mean radius and the max pressure is 0.1 N/mm2 Assuming uniform wear and the coefficient of friction is 0.3, find the inner and outer radius and the axial force required on the clutch.
A A multiple disc clutch transmits 55 kW of power at 1800 r.p.m. The coefficient of friction is 0.1 and the axial intensity of pressure is not to exceed 160 kN/m. The internal radius is 80 mm and is 0.7 times the external radius. Find the number of plates needed to transmit the required torque.
Q) A single plate clutch has to transmit 75 kW at 3000 r.p.m. The spring exerts an axial pressure of 7.35 N/cm3. Determine the inner and outer diameters of the friction surfaces if the ratio of the two diameters is 1.5.
25 Q1/ 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/mm2 ; 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.