Consider a brake testing bench as shown in the figure. Motor 16.1 50 20 Clutch + X A motor speeds up the system through the use of a clutch. Electric control is used to maintain motor speed (constant motor speed). The clutch is actuated from the motor side by a force P equal to 5000 N. A flywheel weighing 60 kg is used to provide inertia to the system. The motor speed is 950 RPM. 250 The next figure shows a proposed shaft onto which the brake side clutch plate, flywheel, and brake disc will be placed. The shaft will be machined from AISI 1050 CD steel, Sut= 690 MPa; Sy=580 MPa. 1251 25.4 Flywheel 200 Brake (Callipers) 50 X 20 Brake (Disc) Units in [mm] Bearing End milled keyway for flywheel placement For the proposed shaft determine the fatigue factor of safety for infinite life using the modified Goodman criteria only at point 1 (the end-milled keyseat where the flywheel will be placed). Do this for two scenarie a) While the clutch is engaged, and slippage occurs. b) While the clutch is engaged, and no slippage occurs (the brake side is rotating at the same speec the motor side). Assume the following: • The brake remains disengaged. Neglect the weight of the shafts, clutch, and brake disc. Neglect friction effects at the bearings. Keyseats are end milled. Use first iteration estimates for stress concentrations. The theoretical stress-concentration factor for axial loading at the keyseat is K₂ = 3.0. A reliability of 99% is required. See clutch properties and relevant tables on next page.
Consider a brake testing bench as shown in the figure. Motor 16.1 50 20 Clutch + X A motor speeds up the system through the use of a clutch. Electric control is used to maintain motor speed (constant motor speed). The clutch is actuated from the motor side by a force P equal to 5000 N. A flywheel weighing 60 kg is used to provide inertia to the system. The motor speed is 950 RPM. 250 The next figure shows a proposed shaft onto which the brake side clutch plate, flywheel, and brake disc will be placed. The shaft will be machined from AISI 1050 CD steel, Sut= 690 MPa; Sy=580 MPa. 1251 25.4 Flywheel 200 Brake (Callipers) 50 X 20 Brake (Disc) Units in [mm] Bearing End milled keyway for flywheel placement For the proposed shaft determine the fatigue factor of safety for infinite life using the modified Goodman criteria only at point 1 (the end-milled keyseat where the flywheel will be placed). Do this for two scenarie a) While the clutch is engaged, and slippage occurs. b) While the clutch is engaged, and no slippage occurs (the brake side is rotating at the same speec the motor side). Assume the following: • The brake remains disengaged. Neglect the weight of the shafts, clutch, and brake disc. Neglect friction effects at the bearings. Keyseats are end milled. Use first iteration estimates for stress concentrations. The theoretical stress-concentration factor for axial loading at the keyseat is K₂ = 3.0. A reliability of 99% is required. See clutch properties and relevant tables on next page.
Automotive Technology: A Systems Approach (MindTap Course List)
6th Edition
ISBN:9781133612315
Author:Jack Erjavec, Rob Thompson
Publisher:Jack Erjavec, Rob Thompson
Chapter44: Four- And All-wheel Drive
Section: Chapter Questions
Problem 4RQ: Briefly explain how a Haldex clutch works.
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