The output shaft of a 120 Watt electric motor has a 20° full-depth steel spur pinion...

The output shaft of a 120 Watt electric motor has a 20° full-depth steel spur pinion with 20 teeth and a module of 2.5 mm driving a 36-tooth gear attached to an air blower. The pinion speed is 100 rpm. Both the pinion and gear are manufactured from grade 2 steel using hobs shaping cutters, have a 18mm wide face, through-hardened steel at 200 Brinell, and are aligned in service such that kH = 1.6. For a service life of 108 cycles, a reliability of 99%, determine the bending fatigue stress and the associated factor of safety

Expert Solution

samet mamat answered 2 years ago

15.33 A spur gear reducer has an 18-tooth pinion driven 1500 rpm by an electric motor...

15.33 A spur gear reducer has an 18-tooth pinion driven 1500 rpm by an electric motor and a 36-tooth gear that drives a load involving “moderate shock.” A life of 106 pinion revolutions is required, and the transmitted load, Ft, is 100 lb (this figure includes a safety factor of 2). Conditions are such that Km = 1.8 and kt = 1. It is proposed that standard 20° full-depth gears be used, with both pinion and gear teeth being cut...

A stock steel spur pinion has a diametral pitch of pd=8 teeth/in, a 1.5 in. face,...

A stock steel spur pinion has a diametral pitch of pd=8 teeth/in, a 1.5 in. face, 26 full-depth teeth, and a pressure angle of Φ = 20°. If the pinion is driven against a 55-tooth steel gear at 1200 RPM by a 7 hp electric motor, determine the bending stresses and surface stresses in the pinion.

A 1.5-kg stone disk is attached to the shaft of an electric motor that exerts a...

A 1.5-kg stone disk is attached to the shaft of an electric motor that exerts a constant torque of 2.5 N ⋅ m on the disk. If the disk has a radius of 0.10 m and starts at rest, determine how many revolutions it makes during the first 3.0 seconds the motor is on.

A pair of gears with 25?, full-depth, involute teeth transmits 125 hp while the pinion rotates...

A pair of gears with 25?, full-depth, involute teeth transmits 125 hp while the pinion rotates at 2500 rpm. The diametral pitch is 4, and the quality number is A9. The pinion has 32 teeth and the gear has 76 teeth. The face width is 1.5 in. The input power is from a multicylinder gasoline engine, and the drive is for a low speed water pump. The drive is a commercial enclosed gear unit. Specify suitable materials for the pinion...

An electric motor exerts a constant torque of τ=10N⋅m on a grindstone mounted on its shaft;...

An electric motor exerts a constant torque of τ=10N⋅m on a grindstone mounted on its shaft; the moment of inertia of the grindstone is I=2.0kg⋅m2. If the system starts from rest, find the work done by the motor in 8.0 s and the kinetic energy at the end of this time. What was the average power delivered by the motor? Part A:Suppose we now turn off the motor and apply a brake to bring the grindstone from its greatest angular...

After full analysis of a solid steel shaft considering deflection, strength and vibrations, we come to...

After full analysis of a solid steel shaft considering deflection, strength and vibrations, we come to know that the shaft design is limited by deflection, which option as a designer would you pursue, provide reasoningfor your choice. (a)Increase the shaft diameter but make the shaft hollow while keeping the weight constant (b)Keep the shaft diameter constant and select a shaft with higher strength (c)Increase the shaft diameter to increase the critical speed and select a steel with higher strength (d)Increase...

The burner on an electric stove has a power output of 2.0 kW. A 610 g stainless steel tea kettle is filled with 20℃ water and placed on the already hot burner.

The burner on an electric stove has a power output of 2.0 kW. A 610 g stainless steel tea kettle is filled with 20℃ water and placed on the already hot burner. Part A If it takes 3.0 min for the water to reach a boil, what volume of water, in cm3, was in the kettle? Stainless steel is mostly iron, so you can assume its specific heat is that of iron. Express your answer using two significant figures.

The accessory drive unit of a large aircraft engine involves an identical pair of 20° full-depth...

The accessory drive unit of a large aircraft engine involves an identical pair of 20° full-depth spur gears. The gears have 50 teeth and rotate together at 5000 rpm. The diametral pitch is 12 and the face width 1.5 in. The gears are made of alloy steel, casehardened to 62Rc (680 Bhn). Although the case extends throughout the fillet, it is conservatively decided to use the core hardness of 500 Bhn for calculating bending fatigue strength. The tooth profiles are...

(20) A 15kW electric motor, which is running at 43 rev/s, is used to drive a...

(20) A 15kW electric motor, which is running at 43 rev/s, is used to drive a crusher which operates 24 hours per day. An engineer has specified 212 mm and 315 mm pitch diameters for small pulley and large pulley respectively; and C 3454 V-belt type. a) Calculate allowable power, design power and required number of belts. (Take design factor nd as 1.)

An electric motor has the power P = 45 kW with terminal voltage Ueff = 380...

An electric motor has the power P = 45 kW with terminal voltage Ueff = 380 V. The power factor is cos (φ) = 0.85. a) Explain the concept of the power factor! What is it? b) Calculate the apparent power S, reactive power Q, and the currents Ieff, IW (active current) and IB (reactive current)! c) What are the consequences for producers and consumers from the existence of reactive power or reactive current?

Question