Machine Elements in Mechanical Design (6th Edition) (What's New in Trades & Technology)
6th Edition
ISBN: 9780134441184
Author: Robert L. Mott, Edward M. Vavrek, Jyhwen Wang
Publisher: PEARSON
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Chapter 12, Problem 23P
The shaft in Figure P12−2 rotates at 200 rpm. Pulley A receives 10 hp from below. Gear C delivers 6 hp to the mating gear below it. Chain sprocket D delivers 4 hp to a shaft above. Use SAE 1117 cold-drawn steel.
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A pair of iron cast gears connecting two shafts at the Angle of the elbow. The diameter of the pinion pitch and the gear is 80 mm and 100 mm. The shape of the gear gear was 14 restriction form. The static voltage allowed for both gear is 55 mpa. If the door transports to 2.95 kw power at the turn of 1200 RPM, identify the module and the number of teeth on each gear from the Angle of power and check the design from the Angle of the tear. Take the surface durability limit is 630 mpa and the modulus elasticity to iron cast is 84 kn /mm2.
Mechanical design
A shaft with the following data:
1- The pulley (A) is 1000 mm in diameter and weight 300N.
2- The gear (B) pitch diameter is 600mm and weight -250N.
3- The pulley is keyed to the shaft at 400mm to the left of left hand bearing.
4-the distance between bearing C and B is 1250 mm.
5- The power is 20 kW at 750 rpm.
6- Tension ratio T1 / T2-2.5 7- The shaft d.livers power to a gear placed horizontally in front, the pressure angel of gear is 20.
8- The allowable shear stress is 70N / mm, kt-2 and km- 1.5.
Determine: the diameter of shaft
Problem Chain and Sprocket. A single-strand roller chain drive connects a 10-hp engine to a lawn waste
chipper/shredder. As the engine operates at 1200 rpm, the shredding teeth should rotate at 240 rpm. The
drive sprocket has 18 teeth. Determine an appropriate pitch for the chain, the number of teeth on the driven
sprocket, the pitch diameters of both sprockets, and the chain speed. Also indicate the number of links in a
suitable chain and specify the required center distance.
Chapter 12 Solutions
Machine Elements in Mechanical Design (6th Edition) (What's New in Trades & Technology)
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- QI Two spur gears in a simple train shown in Figure Ql are having the same module, m = 2 and their respective number of teeth is NTa = 30 for the driver gear, and Nya = 45 for the driven gear. The inertia of the gear attached to the motor is L = 0.Dkgm² and the inertia of the second gear is la = 0.8kgm?. The second gear is connected to a pulley with the radius of 30 mm. The pulley is hoisting up the 2kg load with acceleration of a = 2 ms. Given the gear transmission efficiency is 90%. (a) Based on the module and number of teeth given, examine the pitch diameter of cach gear. (b) Considering acceleration of load at 2 ms-, evaluate the torque of the motor to overcome gears inertia. (c) Considering the 2 kg load, examine the torque required to accelerate the load through gear system. (d) Suggest the minimum torque of the motor to accelerate the 2 kg load at 2 ms. NTG = 45 r=30 mm NTm = 30 IG driver a = 2 ms² 2 kgarrow_forwardPlease solve ellaborately and include the untis in every step, show diagram and write your solutions clearly and readable if your solution is in written form. Your work will be appreaciated much. Thank You! Two shafts 30 in. apart, each carrying a four-step pulley, are to be connected by a crossbelt. The driving shaft is to turn 180 rpm while the driven shaft is to turn 50, 150, 250,and 600 rpm. The smallest step of the driver is 10 in. in diameter. Find (a) the diametersof all the steps, (b) angle of contact for each pair of pulleys, and (c) belt length.arrow_forwardThe shaft in the figure below is part of a drive for an automated transfer system in a metal stamping plant. Gear Q delivers 30 hp to gear B. Sheave D delivers the power to its mating sheave as shown. The shaft carrying B and D rotates at 550 rpm. Use SAE1040 cold drawn steel. Note: Torque on gear at B and the torque on sheave at D are equal. Gear Data: - NB= 96 (Number of teeth on gear B) - Pd= 6 (Diametral pitch for gear B) - Spur gears Gear pressure angle =20o - Shaft at B and D rotate at 550 rpm. Use the following assumptions: - Bearing seats have sharp fillets. Kt=2.5 - Design factor (Factor of Safety) = 3 - Pinion Q is rotating in CCW direction. - Cs= Size factor = 0.80 a) Determine the magnitude of the torque in the shaft at all points b) Compute the forces acting on the shaft at all power-transmitting elements c) Compute the reactions at the bearingsarrow_forward
- A rigid coupling with 30 inches of bolt circle diameter transmits a torque of 18,000 lb-in. The coupling material has a yield strength of 90,000 psi. The coupling is fastened by six bolts. Assume design factor of N=3 Calculate the diameter of each bolt.arrow_forwardA power transmission shaft is to carry a steady 30 horsepower while rotating at 1000 rpm. Specify a suitable diameter for the solid circular shaft if it is to be made from AISI 1020 cold-drawn steel. Use Appendix A-2 for preferred size.arrow_forwardSee Figure P12–6. The shaft rotating at 310 rpm carries a spur pinion E having 36 teeth with a diametral pitch of 6. The teeth are of the 20°, full-depth, involute form. The pinion delivers 20 hp to a gear to the left as shown. Compute the torque delivered by the shaft to pinion E and the tangential and radial forces exerted on the shaft by the pinion. Include the weight of the pinion.arrow_forward
- 4) An electric motor purchased by your employer surprisingly arrived without a keyway in the shaft. The motor has power rating of 7.5kW & 1,800rpm & has a shaft of 17mm. It will be used to drive a centrifugal pump using cast iron sheave. Design the square key to be used in the assembly based on maximum bearing & shearing stresses of 580MPa & 370MPa, respectively, and factor of safety of 5.arrow_forward13-55 Gear 2, in the figure, has 16 teeth, a 20° transverse pressure angle, a 15° helix angle, and a module of 4 mm. Gear 2 drives the idler on shaft b, which has 36 teeth. The driven gear on shaft c has 28 teeth. If the driver rotates at 1600 rev/min and transmits 6 kW, find the radial and thrust load on each shaft. LH 90° Problem 13-55 RH RHarrow_forwardA chain drive is desired to couple a gearmotor with a bucket elevator. The 40 hp. gearmotor will operate at 350 rpm and the elevator drive shaft must operate as close to 60 rpm as possible. Select an appropriate chain size, commercially available sprockets, and number of links for a chain. Also calculate the actual chain speed and the center distance.arrow_forward
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