i Dont understand how i am suppose to find the amount of belts needed to make the transmission system viable for usage. or maybe i am miss understanding what i am actually suppose to do it this question. file is attached for understanding Document Preview: UNIVERSITY OF CAPE TOWN DEPARTMENT OF MECHANICAL ENGINEERING MEC2020W Design I Assignment 7 August /September 2012 POWER TRANSMISSION Emphasis of assignment: 1. Fastener design 2. Basic belt calculations 3. Developing calculation models Assignment: You are to design a Power transmission for a crank shaft. Power from an engine is transmitted through V-Pulleys and belts to a crankshaft. A V-Pulley is fastened to the flange which is securely clamped to the crank shaft for facilitating the power transmission (See sketch). The engine power, speed and pulley diameters are given in a table on the following page. An example of the coupling is given below. You have to perform the necessary fastener calculations both for pulley and flange to ensure that your design can safely transmit this power. Only the dimensions where the coupling attaches to the crankshaft are to remain fixed otherwise you may alter dimensions, number of belts or fasteners as required. A complete set of working drawings and an assembly drawing are to be prepared. Assume: V-angle of belt = 36?; Belt friction= 0.3Use the following table to determine the input variables for your calculations: Date of Birth Engine Power (kW) Crankshaft Pulley Diameter (mm) Output pulley diameter (mm) Crankshaft speed (rpm) 1 Jan 31 Mar 4 114 200 2400 1 Apr 30 June 5 127 200 3000 1 July 30 Sep 4 127 200 2600 1 Oct 31 Dec 5 114 200 3000 Instructions: A7-1: Familiarise yourself with the forces involved in a belt drive, by reading the course notes on Belts & Chains on Vula, and sections of Juvinall & Marshek and Jensen, Helsel & Short. You do not need to understand the derivation of the equations for now, but you do need to to calculate the resultant forces and torque that a belt drive exerts on a pulley and shaft. A7-2: Based on the resultant loads on the pulley, develop a model for how these forces are carried through a bolted joint. You should determine which variables a designer may wish to change and ensure that Attachments: Pulley-coupli.pdf; i Dont understand how i am suppose to find the amount of belts needed to make the transmission system viable for usage. or maybe i am miss understanding what i am actually suppose to do it this question. file is attached for understanding Document Preview: UNIVERSITY OF CAPE TOWN DEPARTMENT OF MECHANICAL ENGINEERING MEC2020W Design I Assignment 7 August /September 2012 POWER TRANSMISSION Emphasis of assignment: 1. Fastener design 2. Basic belt calculations 3. Developing calculation models Assignment: You are to design a Power transmission for a crank shaft. Power from an engine is transmitted through V-Pulleys and belts to a crankshaft. A V-Pulley is fastened to the flange which is securely clamped to the crank shaft for facilitating the power transmission (See sketch). The engine power, speed and pulley diameters are given in a table on the following page. An example of the coupling is given below. You have to perform the necessary fastener calculations both for pulley and flange to ensure that your design can safely transmit this power. Only the dimensions where the coupling attaches to the crankshaft are to remain fixed otherwise you may alter dimensions, number of belts or fasteners as required. A complete set of working drawings and an assembly drawing are to be prepared. Assume: V-angle of belt = 36?; Belt friction= 0.3Use the following table to determine the input variables for your calculations: Date of Birth Engine Power (kW) Crankshaft Pulley Diameter (mm) Output pulley diameter (mm) Crankshaft speed (rpm) 1 Jan 31 Mar 4 114 200 2400 1 Apr 30 June 5 127 200 3000 1 July 30 Sep 4 127 200 2600 1 Oct 31 Dec 5 114 200 3000 Instructions: A7-1: Familiarise yourself with the forces involved in a belt drive, by reading the course notes on Belts & Chains on Vula, and sections of Juvinall & Marshek and Jensen, Helsel & Short. You do not need to understand the derivation of the equations for now, but you do need to to calculate the resultant forces and torque that a belt drive exerts on a pulley and shaft. A7-2: Based on the resultant loads on the pulley, develop a model for how these forces are carried through a bolted joint. You should determine which variables a designer may wish to change and ensure that Attachments: Pulley-coupli.pdf
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