Texts: A haulage gear is driven by a motor which develops 15 kW at a full speed of 750 rev/min. The haulage drum is 1.5 m in diameter, and the total reduction ratio of the gearing between the motor and drum is 15:5. The efficiency of the gear is 75 percent, the gradient is 1 in 25, and the rail friction is 135 N per tonne of load. The masses of the gear are equivalent to a total mass of 2.3 Mg, with a radius of gyration of 0.5 m at the drum shaft. Calculate the total load that can be hauled at the full speed. If the motor can give an excess torque of 10 percent of that at full speed, calculate the acceleration possible, assuming that the efficiency and rail friction values remain unaltered.

A flat open belt drive is used to transmit a power of 22 kW from a motor shaft rotating at 950 rpm. The radius of the pulley of the motor shaft is 125 mm while the radius of the pulley of the driven shaft is 450 mm. The center distance between the shafts is 2,250 mm. The coefficient of friction is 0.25 and the density of the belt material is 950 kg/m3. The belt width is 120 mm. The allowable stress is 2.1 MPa. Determine the thickness of the belt. Express your final answer in mm and use ONE decimal place. Write only the numerical value and do not type the unit anymore.

A spur pinion of pitch diameter 50 mm rotates at 200 rad/s and transmits 3 kW power. The pressure angle of the tooth of the pinion is 20°, what is the total force exerted by a tooth of the pinion on the tooth on a mating gear?

The horsepower developed at the end of the crankshaft of a 4-stroke, 4 -cylinder internal combustion engine was found to be 30 HP at a speed of 1500 RPM. The mean effective pressure is 6 kg/cm2. The stroke-bore ratio is 1.3. Find the length of stroke and diameter of bore if the mechanical efficiency is 80%.

The following drive system is used to raise a load at constant velocity. The motor rotational speed is 1000 rpm, and the rotational speed of the drum is 200 rpm. The efficiency of the gear box is 0.85. The efficiency of the drum is 0.95%. The moment of inertia of the motor (input shaft) is 0.5 kg.m², and the moment of inertia of the drum (output shaft) is 0.75 kg.m². Calculate: (1) The total (equivalent) moment of inertia of the drive system referred to the motor shaft. (2) The developed mechanical power on the motor Drum, 0.5 m diameter shaft. 1000 Kg Motor Gearbox

A gearset has a module of 5 mm, a 20 degree pressure angle, and a 24-tooth cast iron spur pinion driving a 48-tooth cast-iron gear. The pinion is to rotate at 500 rev/min. The objective is to calculate the power in kwatt that can be transmitted by the gearset.. In this case, the cast iron, cast profile gears and the velocity factor must be calculated from the Barth equation. The bending stress is limited to 50 MPa and the facewidth is 60 mm. The velocity factor is considered to be significant and must be used in stress calculations. Calculate the power in kwatt the gearset can transmit using the Lewis bending equation. Note: in this case the stress MUST be modified by the velocity factor, Kv.

Design a single-plate automobile clutch to transmit a maximum torque of 250 N-m at 2000 rpm. The outside diameter of the clutch is 250 mm and the clutch is engaged at 55 km/h. Find: 1. The number of revolutions of the clutch slip during engagement; and 2. Heat to be dissipated by the clutch for each engagement. The following additional data is available: Engine torque during engagement = 100 N-m; Mass of the automobile = 1500 kg; Diameter of the automobile wheel = 0.7 m; Moment of inertia of combined engine rotating parts, flywheel, and input side of the clutch = 1 kg-m²; Gear reduction ratio at differential = 5; Torque at rear wheels available for accelerating automobile = 175 N-m; Coefficient of friction for the clutch material = 0.3; Permissible pressure = 0.13 MPa.

3.A chain drive using bush roller chain transmits 5.6 kW of power. The driving shaft on an electric motor runs at 1440 r.p.m. and velocity ratio is 5. The centre distance of the drive is restricted to 550 ± 2% mm and allowable pressure on the pivot joint is not to exceed 10 N/mm2. The drive is required to operate continuously with periodic lubrication and driven machine is such that load can be regarded as fairly constant with jerk and impact. Design the chain drive by calculating leading dimensions, number of teeth on the sprocket and specify the breaking strength of the chain. Assume a factor of

A flat belt with a width of 120 mm and a thickness of 5 mm transmits power from a driving pulley with a diameter of 250 mm to a driven pulley with a diameter of 700 mm. The mass per unit length of the belt is 2.1 kg/m, and the coefficient of friction is 0.25. The input power of the belt is 60 kW at 1000 rpm. Calculate the following when the center distance is 3.5 m. (a) Maximum tensile stress of the belt(b) Axial load on each pulley

A spur pinion of pitch diameter 50 mm rotates at 200 rad/s and transmits 3 kW power. The pressure angle of the tooth of the pinion is 20° Assuming that only one pair of the teeth is in contact the total force (in Newton) exerted by a tooth of the pinion on the tooth on a mating gear is...