The following data relate to ascrew jack:Pitch of the threaded screw= 8 mmDiameter of the threaded serew= 40 mmCoefficient of friction between screw and nut =0.Load = 20 kNAssuming that the load rotates with the screwdetermine theratio of torques required to raise andlower the load(ii) efticiency of the machine,

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Answered: The following data relate to a screw…

Automotive Technology: A Systems Approach (MindTap Course List)

6th Edition

ISBN:9781133612315

Author:Jack Erjavec, Rob Thompson

Publisher:Jack Erjavec, Rob Thompson

Chapter46: Suspension Systems

Section: Chapter Questions

Problem 2RQ: Explain the difference between sprung and unsprung weight.

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The larger diameter and face of the disk of a multiple disk chutch are 225 mm and 20 mm respectively. The load applied to the spring of the clutch axially is 1500 N. Assuming that there are 8 pairs of friction 0.18 and tuning 800 rpm. Find the power transmitted by the clutch using uniform pressure method. (Ans, 13.67 kW)
A soft surface cone clutch must handle 1865 In-1b of torque at 1250 rpm. The large diameter of the clu is 13.75 in. and the included angle in 12.5°. The face width of the bearing surfaces is 2.5 in. Using efficient of friction 0.20. determine (a) the force (F) to engage the clutch, (b) the required normal unit pa sure on the contact surfaces when operation is at capacity Ans. 428 lb. 13.15 psi
Plz attempt if you know the answer otherwise skip to another expert. A flat belt is required to transmit 30 kW from a pulley of 1.5 m effective diameter running at 300 rpm. The angle of contact is spread over 11/24 of the circumference. The coefficient of friction between the belt and pulley surface is 0.3. Determine taking centrifugal tension in to account, width of the belt required. It is given that the belt thickness is 9.5 mm, density of belt material is 100 kg / (m ^ 3) and the permissible working stress is 2.5 MPa.
Question No.13: A multiple disc clutch has three discs on the driving shaft and two on the driven shaft, providing four pairs of contact surfaces. The outer diameter of the contact surfaces is 250mm and inner diameter is 150mm. Determine the maximum axial intensity of pressure between the discs for transmitting 18.75kW at 500 rpm. Assume uniform wear and coefficient of friction as 0.3.
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A multiple V-belt drive is required to transmit 4 kW. The smaller pulley of the system is150 mm diameter, rotates at 200 rev/min, and has an angle of lap angle of 135°. Thegrove angle is 40° and the coefficient of friction between the belt and the pulleys is 0·3.If the maximum tension in any one belt is limited to 800 N, calculate:(a) The number of belts required. (b) The minimum tension in any one belt. (c) The required pre-tensioning of the belt. The centre-to-centre distance between the pulleys is 2 m.(d) Determine to the nearest mm, the required size for the larger pulley.(e) Find the approximate length of the belt
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