Xem 1-20 trên 358 kết quả Lubricants
  • This handbook is intended to help engineers in industry with the operation and maintenance of machinery. It gives the information that these engineers need in a form that is instantly accessible and easy to read. The manufacturers of machinery provide guidance on the operation, lubrication and maintenance required for their particular machines.

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  • Volume II of the Handbook of Lubrication (Tribology) provides coverage of basic theory involved in friction, wear, and lubrication; characteristics and application practices for lubricants; and design principles for lubricated machine elements such as bearings, gears, couplings, and seals.

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  • This manual provides guidance on lubricants and hydraulic fluids to engineering, operations, maintenance, and construction personnel and other individuals responsible for the U.S. Army Corps of Engineers (USACE) civil works equipment. Applicability. This manual applies to all USACE commands having civil works responsibility. 3. Discussion. This manual is intended to be a practical guide to lubrication with enough technical detail to allow personnel to recognize and easily discern

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  • The most important function of lubricants is the reduction of friction and wear and in some cases, the relative movement of two bearing surfaces is only possible if a lubricant is present. In times when saving energy and resources and cutting emission have become central environmental matters, lubricants are increasingly attracting public awareness. Scientific research has shown that 0.4% of gross domestic product could be saved in terms of energy in Western industrialized countries if current tribological knowledge, i.e.

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  • The lubrication of rolling bearings – similar to that of sliding bearings – mainly serves one purpose: to avoid or at least reduce metal-to-metal contact between the rolling and sliding contact surfaces, i.e. to reduce friction and wear in the bearing. Oil, adhering to the surfaces of the parts in rolling contact, is fed between the contact areas. The oil film separates the contact surfaces preventing metal-to-metal contact (»physical lubrication«).

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  • Marine Corps Institute Cooling and Lubrication System Maintenance

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  • The phenomenon of friction has been part of daily life since the beginning of human existence. It is no surprise that some of the earliest human activities involved the reduction of friction when it was wasteful, or the use of friction when it could be beneficial. The first category includes the use of vegetable oils and animal fats as lubricants, as well as the use of rolling motion to take advantage of the resulting low resistance to movement.

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  • Tham khảo tài liệu 'cooling and lubrication system maintenance p2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Since the dawn of history, human activities have always been closely related to friction, the resistance to sliding. It is thanks to friction that one can stand and walk on the ground, one can wear clothes, one can make fire by rubbing two sticks together, or one can even start and stop a car. In these cases friction is very useful for human beings. In many other cases, however, human activities have been very much hampered by friction since ancient times. How to diminish friction is one of the most basic technological problems. For example, when a heavy...

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  • Tham khảo sách 'tribology - lubricants and lubrication_2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Records show the use of wheels from 3500 BC, which illustrates our ancestors’ concern with reducing friction in translationary motion. The transportation of large stone building blocks and monuments required the know-how of frictional devices and lubricants, such as water-lubricated sleds. Figure 1.1 illustrates the use of a sledge to transport a heavy statue by Egyptians circa 1880 BC...

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  • This book is intended primarily to be used as a te xtbook, written on the level of senior and graduate students with proficiency in engineering or sciences. It is intended to bring everyone who wants to solve problems in friction and wear to the same understanding of what is (and, more important, what is not) involved. Most engineers and scientists have learned a few simple truths about friction and wear, few of which seem relevant when problems arise. It turns out that the “truths” are often too simple and couched too much in the terms of the academic discipline in...

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  • Bearings (both plain and rolling element) are used as important supporting elements for locating rotating components and confining their motion in desired direction. In order to ensure their operational reliability and desired life, these need to be properly designed/selected for an application more so because of ever increasing operational speeds. This requires the careful performance evaluation of different types of bearings considering aspects such as thermal stability, lubrication, contaminants in lubricants and controlling mechanism etc....

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  • This book explains the theory, components, and practical applications of systems in turboprop, turojet, and turbofan aircraft. The author clearly examines electrical, turbine engine, lubrication and coooling , and other systems.

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  • Spring Designer's Handbook, Harold Carlson Computer-Aided Graphics and Design, Daniel L. Ryan lubrication Fundamentals, J. George Wills Solar Engineering for Domestic Buildings, William A. Himmelman Applied Engineering Mechanics: Statics and Dynamics, G. Boothroyd and C. Poli Centrifugal Pump Clinic, lgor J . Karassik Computer-Aided Kinetics for Machine Design, Daniel L. Ryan Plastics Products Design Handbook, Part A: Materials and Components; Part B: Processes and Design for Processes, edited by Edward Miller Turbomachinery: Basic Theory and Applications, Earl Logan, Jr.

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  • Tham khảo tài liệu 'tribology - lubricants and lubrication part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Once again, it is evident that the smaller minimum film thickness occurs between the most heavily loaded ball and the inner race. However, in this case the minimum elastohydrodynamic film thickness is about three times the composite surface roughness, and the bearing lubrication can be deemed to be entirely satisfactory. Indeed, it is clear from Fig. 21.97 that very little improvement in the lubrication factor F and thus in the fatigue life of the bearing could be achieved by further improving the minimum film thickness and hence A....

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  • Tower reported the results of a series of experiments intended to determine the best methods to lubricate a railroad journal bearing. Working with a partial journal bearing in an oil bath, he noticed and later measured the pressure generated in the oil film. Tower pointed out that without sufficient lubrication, the bearing operates in the boundary lubrication regime, whereas with adequate lubrication the two surfaces are completely separated by an oil film. Petrov [5] also conducted experiments to measure the frictional losses in bearings.

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  • Tham khảo tài liệu 'tribology - lubricants and lubrication part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • By the middle of this century two distinct regimes of lubrication were generally recognized. The first of these was hydrodynamic lubrication. The development of the understanding of this lubrication regime began with the classical experiments of Tower,1 in which the existence of a film was detected from measurements of pressure within the lubricant, and of Petrov,2 who reached the same conclusion from friction measurements.

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