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Most of what we have seen in these discussions on mechanics could be described as couplers, that is, devices that join two parts together. In power transmission a coupler s role is to connect the power source with the actuator while adjusting for misalignments and other impediments to motion. A coupler may be as simple as a tube with set-screws in it, used to fasten two shafts together. A step up in complexity and the tube has di erent-sized holes at each end to join shafts with mismatched diameters. Cut slots across the tube between the shafts and it can ex a little bit, adjusting for slight angle di erences. For lightweight connections, a short length of latex tubing can work. A spider coupler (Fig. 9-22) is like a universal joint and allows for larger di erences in angle. The central cross-shaped spider ts between the input and output ttings. There are many di erent types of coupler available to engineers today, for all di erent types of torque ratings and forms of misalignment. A di erent type of coupler disconnects the power from the load in the case of a jam or overload. Some attachments are naturally weak, such as a set-screw pressing on a round shaft. If the load becomes too great, the screw slips. Using a pin or metal key to hold the shaft to its load allows more torque to be transmitted than the set-screw. By carefully sizing the key, you can arrange for it to break before your gear-train does inconvenient, but better than ruining the whole system. The LEGO Mindstorms set comes with a clutch, the white gear in Fig. 9-23, which is a reusable torque-limiting coupler. A clutch has two sliding plates that normally stick together. When the torque reaches its built-in limit



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Microelectro-mechanical Systems (MEMS)

Fig. 9-23.

photolithography or prime moulds for the LIGA process Conductive polymers can serve as organic substrates for MEMS and microsystems Polymers are also widely used as electromagnetic interference (EMI) and radiofrequency interference (RFI) shields in microsystems More applications of polymers can be obtained from the work of Hsu [6] and Bley [11]





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In the application of hybrid fluid bearings, plain bearings with slots or orifices as in aerostatic journal bearings are often preferred to recessed bearings because of the higher load capacity at an elevated speed The recess arrangement is not suitable as it impairs the hydrodynamic performance The circumferential slots or orifices can be arranged either in a single row (half station feeding in aerostatic journal bearing) or in two rows (Figure 664) Hybrid bearings are well suited for heavily loaded conditions at high speeds, and they have the advantages of both hydrodynamic and hydrostatic bearings and eliminate some of the disadvantages Hybrid bearings avoid hydrodynamic bearing wear when starting and stopping Furthermore, hybrid bearings can be designed at a smaller shaft diameter size which helps reduce the cost associated with the material and operation

the plates slip against each other. In a car with manual gearing, the clutch is opened and closed using a foot pedal.

and orifices for hybrid fluid bearings similar to that of aerostatic journal bearings [19]

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Hamrock, BJ, Fundamentals of Fluid Film Lubrication, McGraw Hill, 1999 Funk and Wagnalls, New Encyclopedia, Bearings, Volume 3, 2002 Powell, JW, Design of Aerostatic Bearings, The Machinery Publishing Co Ltd, 1970 Shigley, JE and Mischke, CR, Mechanical Engineering Design, McGraw Hill, 2001 El-Tayeb, N, Journal Bearings, Faculty of Engineering and Technology, Multimedia University, Melaka, Malaysia Wilcock, DF and Booser, ER, Bearing Design and Application, McGraw Hill Book Company, 1957 Barwell, FT, Bearing Systems: Principles and Practice, Oxford University Press, 1979 East Med Yacht Company>2005 [online] Slocum, AH, Precision Machine Design, Prentice Hall, 1992 SPG Media Limited Deep Blue-Pipelay Vessel, <http://wwwship-technologycom> 2005 SKF Aeroengine SKF The Knowledge Engineering Company, <http://investorsskfcom/annual2001/ 012_knowledge_companyphp> Machine Tool Design Handbook, Central Machine Tool Institute, 1978 Juvinall, RC and Marshek, KM, Fundamentals of Machine Component Design, John Wiley and Sons, 2000 Mott, RL, Machine Elements in Mechanical Design, Macmillan Publishers, New York, 1992 Pethybridge, G, Plain Bearing Options for Pumps, Waukesha Bearings, 2002

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