Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)
10th Edition
ISBN: 9780073398204
Author: Richard G Budynas, Keith J Nisbett
Publisher: McGraw-Hill Education
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Chapter 17, Problem 15P
To determine
The design of a friction belt drive.
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A fan is driven by a belt from a motor which runs at 880 rpm. A medium double ply leather belt 5/16 inches thick and 10 inches wide is used. The diameters of the motor pulley and the driven pulley are 14 inches and 54 inches, respectively. The center distance is 54 inches and both pulleys are made of cast iron. Coefficient of friction of leather on cast iron is 0.35. The allowable stress of the belt is 350 psi and the belt weighs 0.035 lb/in^3. What is the horsepower capacity of the belt?
A reciprocating compressor is driven by a standard three-phase
motor with a rated speed of 1490 min-1 and a power of 50 kW,
via a flat belt. If the diameters of the pulleys are 355 mm and
1000 mm, the distance between the axes is 1250 mm and the
friction coefficient is 0.3, what is the theoretical belt length?
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A multiple V-belt drive is required to transmit 4 kW. The smaller pulley of the system is150 mm diameter, rotates at 200 rev/min, and has an angle of lap angle of 135°. Thegrove angle is 40° and the coefficient of friction between the belt and the pulleys is 0·3.If the maximum tension in any one belt is limited to 800 N, calculate:(a) The number of belts required. (b) The minimum tension in any one belt. (c) The required pre-tensioning of the belt. The centre-to-centre distance between the pulleys is 2 m.(d) Determine to the nearest mm, the required size for the larger pulley.(e) Find the approximate length of the belt
Chapter 17 Solutions
Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)
Ch. 17 - Example 17-2 resulted in selection of a 10-in-wide...Ch. 17 - A 6-in-widc polyamide F-l flat belt is used to...Ch. 17 - Prob. 3PCh. 17 - A flat-belt drive is to consist of two...Ch. 17 - In solving problems and examining examples, you...Ch. 17 - Return to Ex. 17-1 and complete the following. (a)...Ch. 17 - Prob. 7PCh. 17 - Prob. 8PCh. 17 - Prob. 9PCh. 17 - Two shafts 20 ft apart, with axes in the same...
Ch. 17 - Prob. 11PCh. 17 - Prob. 12PCh. 17 - A designer has to select a metal-belt drive to...Ch. 17 - Prob. 14PCh. 17 - Prob. 15PCh. 17 - Prob. 16PCh. 17 - Prob. 17PCh. 17 - Two B85 V belts are used in a drive composed of a...Ch. 17 - Prob. 19PCh. 17 - Prob. 20PCh. 17 - The geometric implications of a V-flat drive are...Ch. 17 - A 2-hp electric motor running at 1720 rev/min is...Ch. 17 - The standard roller-chain number indicates the...Ch. 17 - Prob. 24PCh. 17 - A double-strand no. 60 roller chain is used to...Ch. 17 - A four-strand no. 40 roller chain transmits power...Ch. 17 - Prob. 27PCh. 17 - Prob. 28PCh. 17 - Prob. 29PCh. 17 - Prob. 30PCh. 17 - Prob. 31PCh. 17 - Prob. 32PCh. 17 - Prob. 33PCh. 17 - For Prob. 17-29 estimate the elongation of the...
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- A flat belt is to consist of 2 m diameter and 1.5 m diameter cast iron pulleys spaced at 4.8 m apart. It is to transmit 50 kW at a pulley speed of 380 rev/min. By using a service factor of 1.1 and a design factor 1277 ks 60 of 1.0: (a) Calculate the hoop tension, F. due to centrifugal force. (b) (c) b Find the torque,T due to the design power and pulley speed. Design and select a suitable belt type and dimension for the above application.arrow_forwardA V-belt drive transmits 20kW from an electric motor running at 1440rpm to the main shaft of a roving machine. The motor and main shaft pulleys have 300 & 600 rpm respectively. The coefficient of friction between belt and pulley is 0.25. The centre distance between the shafts is 1000mm. The top width, thickness, section angle and density of belt and permissible tension on the belt are 22mm, 14mm and 40deg, 0.97gcm-2 and 600N respectively. How many belts are needed? Calculate the length of a belt neededarrow_forwardA fan is driven by a belt from a motor which runs at 880 rpm. A medium double ply leather belt 8 mm thick and 250 mm wide is used. The diameters of the motor pulley and the driven pulley are 350 mm and 1370 mm. The center distance is 1370 mm, and both pulleys are made of cast iron. Coefficient of friction of leather on cast iron is 0.35. The allowable stress for the belt is 2.4 MPa, which allows for the factor of safety and also for the fact that a double ply belt does not have double the capacity of a single ply belt. (A double ply belt has approximately 85% the capacity of a single ply belt of the same thickness.) The belt density p =970 kg/m^3. What is the power capacity? (Answer: 39.1 kW ) -0350 -1370arrow_forward
- Power is transmitted between two shafts by a V-belt whose mass is 0.9 kg/m length. The maximum permissible tension in the belt is limited to 2.2 kN. The angle of lap is 170° and the groove angle 45°. If the coefficient of friction between the belt and pulleys is 0.17, find : 1. velocity of the belt for maximum power; and 2. power transmitted at this velocity. Note: Sketch the belt drive system for both parts and label the given data on it.arrow_forwardThe V-belt is used to deliver 7.5 kW of power at 1440 rpm from the electric motor to the fan which rotates at 480 rpm and works 24 hours a day. The transmission shaft distance is 1 m. The load correction factor (Fa) is known to be 1.3 and the type of V-belt cross-section is type B with a pitch distance correction factor (Fc) of 1.08 and an arc of contact (Fd) correction factor of 0.94. The diameter of the driving pulley is 200 mm and the driven pulley is 600 mm. Calculate: pitch distance (L)actual/corrected transmission shaft distance (C)arc of contact anglepower rating per beltnumber of belts requiredarrow_forwardA 6-in-wide polyamide F-1 flat belt is used to connect a 4-in-diameter pulley to drive a larger pulley with an angular velocity ratio of 3. The center-to-center distance is 8 ft. The angular speed of the small pulley is 1850 rev/min as it delivers 2 hp. The service is such that a service factor Ks of 1.25 is appropriate. (a) Find Fc, Fi, F1a, and F2. (b) Find Ha, nfs, and belt length. (c) Find the dip.arrow_forward
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