The arrangement EXERCISES 400 120 us 3 The arrangements of a transmission brake is shown in Fig. 19.40. The arms are...
EXERCISES 400 120 us 3 The arrangements of a transmission brake is shown in Fig. 19.40. The arms are pivoted at o, and O2 and when force is applied at the end of a hand lever, the screw AB rotates. The left and right hand 120 force on the hand lever is applied 400 mm from the axis of the screw The drum is 240 mm in diameter and the angle subtended by each is 90°. The screw has six square threads with a mean diameter of 20 mm and a lead of 55 mm. Assuming a coefficient of friction for the braking surface as 0.3 and for the threads 0.15, determine the force on the hand lever required to set the brake when the torque on the drum is 245 N-m. 40 40 Ans. 865 N All dimensions in mm. Fig 19.40
EXERCISES 400 120 us 3 The arrangements of a transmission brake is shown in Fig. 19.40. The arms are pivoted at o, and O2 and when force is applied at the end of a hand lever, the screw AB rotates. The left and right hand 120 force on the hand lever is applied 400 mm from the axis of the screw The drum is 240 mm in diameter and the angle subtended by each is 90°. The screw has six square threads with a mean diameter of 20 mm and a lead of 55 mm. Assuming a coefficient of friction for the braking surface as 0.3 and for the threads 0.15, determine the force on the hand lever required to set the brake when the torque on the drum is 245 N-m. 40 40 Ans. 865 N All dimensions in mm. Fig 19.40