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Analysis of Internal Expansion Shoe Break

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Theory Of Machine

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Analysis of Internal Expansion Shoe Break

  1. 1. Theory of Machine (2151902) Mechanical Department Sem.: 5th D (D2) • Prepared By: Sajan Gohel (160123119010) Topic : Analysis of internal expansion shoe break
  2. 2. Internal Expanding shoe Brake  An internal expanding shoe brake consists of two shoes S1 and S2.  The outer surface of the shoes are lined with some friction material to increase the coefficient of friction and to prevent wearing away of the metal. Each shoe is pivoted at one end about a fixed fulcrum O1 and O2 and made to contact a cam at the other end.
  3. 3.  When the cam rotates, the shoes are pushed outwards against the rim of the drum.  The friction between the shoes and the drum produces the braking torque and hence reduces the speed of the drum.  The shoes are normally held in off position by a spring .  The drum encloses the entire mechanism to keep out dust and moisture.
  4. 4. Working  Now we consider the forces acting on the brake when the drum rotates in the anticlockwise direction : It may be noted that for the anticlockwise direction, the left hand shoe is known as leading or primary shoe while the right hand shoe is known as trailing or secondary shoe.
  5. 5.  r = Internal radius of the wheel rim.  b = Width of the brake lining.  F1 = Force exerted by the cam on the leading shoe.  F2 = Force exerted by the cam on the trailing shoe. = coefficient of friction. µ µ
  6. 6. • Consider a portion AC of the leading shoe, at an angle with OO1. it subtends an angle at the center O of the brake drum. • Due to application of force F1 at the top of the shoe as shown, let be the normal reaction and as the corresponding frictional force. • The rate of wear of shoe lining at a will be directly proportional to perpendicular distance from O1 to OA nRδ nRµδ