A calliper brake is required for the front wheels of a van with a braking capacity of 900 Nm for each brake. Preliminary design estimates have set the brake geometry as ri=100 mm, ro=160 mm and 0=45°. A pad with a coefficient of friction of 0,3 has been selected.

In Fig. 6-38 the maximum lining pressure for any point on the brake is to be limited to 100 psi; μ = 0.2. Find the torque capacity of the brake and the value of force P. Ans. T = 9,080 in-lb, P = 487 lb

42. A block-brake shown below has a face width of 300 mm and a mean co-efficient of friction of 0.25. For an activating force of 400 N, the braking torque in Nm is 200 mm 400 mm - 400 N 300 mm 45° - 150 mm -

A ball bearing subjected to a radial load of 4000 N is expected to have a satisfactory life of 12 000 hours at 720 r.p.m. with a reliability of 95%. Calculate the dynamic load carrying capacity of the bearing, so that it can be selected from manufacturer's catalogue based on 90% reliability. If there are four such bearings each with a reliability of 95% in a system, what is the reliability of the complete system?

DESIGN CHANGE.  Now: The Object weighs 100 lb The angle of P above the horizontal is 42 degrees The coefficient of static friction is 0.6     The magnitude of the maximum P that will not initiate motion of the Object is _____lb.

A caliper brake is required for the front wheels of a sports car with a braking capacity of 820N m for each brake. Preliminary design estimates have set the brake geometry as , = 100 mm, r, = 160 mm and 0 = 45°. A pad with a coefficient of friction of 0.35 has been selected. Deterrmine the required actuating force and the average and maximum contact pressures.

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Problem 6 The figure depicts a band brake whose drum rotates counterclockwise at 200 rev/min. The drum diameter is 16 in and the band lining 75 mm wide. The coefficient of friction is 0.20. The maximum lining interface pressure is pV=1.5 MPa.m/s. (a) Find the brake torque, necessary force P, and steady-state power. (b) Complete the free-body diagram of the drum. Find the bearing radial load that a pair of straddle-mounted bearings would have to carry. 75 mm- -250 mm-

Wear rate of a truck tyre under an average load of 53 tonnes was 0.6m per kilometre of travel when it was just rolling, however, it increased to 5um when it was slipping under a stopping brake on a downhill slope having the grade g = 17%. Calculate the tyre working life in terms of number of kilometres travelled for both (1) rolling and (il) slipping case, if the maximum tyre thread depth was 21 mm. Calculate the stopping brake distance for the case of (iii) rolling and (iv) slipping, when the truck started braking at the speed of 52km/hr.

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