Xem 1-20 trên 21 kết quả Bearing surfaces
  • 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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  • Rafael Menezes Nunes UFRGS. Reginald K. Asher Motorola Inc. William P. Bardet Pioneer Motor Bearing Company Donald W. Baudrand MacDermid Inc. George T. Bayer Alon Processing Inc. Thomas Bell University of Birmingham Donald W. Benjamin AlliedSignal Aerospace L. Keith Bennett Alon Processing Inc. Alan Blair AT&T Bell Laboratories Andrew Bloyce University of Birmingham James Brock Olin Corporation Robert R. Brookshire Brushtronics

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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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  • This book provides an example of the successful and rapid expansion of bioengineering within the world of the science. It includes a core of studies on bioengineering technology applications so important that their progress is expected to improve both human health and ecosystem. These studies provide an important update on technology and achievements in molecular and cellular engineering as well as in the relatively new field of environmental bioengineering.

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  • Harrison's Internal Medicine Chapter 106. Plasma Cell Disorders Plasma Cell Disorders: Introduction The plasma cell disorders are monoclonal neoplasms related to each other by virtue of their development from common progenitors in the B lymphocyte lineage. Multiple myeloma, Waldenström's macroglobulinemia, primary amyloidosis (Chap. 324), and the heavy chain diseases comprise this group and may be designated by a variety of synonyms such as monoclonal gammopathies, paraproteinemias, plasma cell dyscrasias, and dysproteinemias.

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  • This book provides an example of the successful and rapid expansion of bioengineering within the world of the science. It includes a core of studies on bioengineering technology applications so important that their progress is expected to improve both human health and ecosystem. These studies provide an important update on technology and achievements in molecular and cellular engineering as well as in the relatively new field of environmental bioengineering.

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  • The plasma cell disorders are monoclonal neoplasms related to each other by virtue of their development from common progenitors in the B lymphocyte lineage. Multiple myeloma, Waldenström's macroglobulinemia, primary amyloidosis (Chap. 324), and the heavy chain diseases comprise this group and may be designated by a variety of synonyms such as monoclonal gammopathies, paraproteinemias, plasma cell dyscrasias, and dysproteinemias.

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  • Guide Bush • Hardness 60 ±2 HRC • to be glued in place Roller cage • synthetic material • one-piece Needle rollers • Steel, hardened • free from backlash, due to preload 2 - 6 µm • High bearing surface, due to Needle Rollers Demountable Guide Pillar • Hardness 60 ±2 HRC • Ground and polished running surface • paired with Guide Bush Führungssäule Guide Pillar Führungsbuchse Guide Bush

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  • Arthroplasty is one of the most dynamic and rapidly expanding spheres of orthopedics and medical science. The successive stages of development of the technique of joint replacement include introduction of uncemented implants, emergence of biomaterials and ceramics, and evolution of bearing surfaces. Last but not least, credit to the success of arthroplasty is attrib‐ uted to continuous improvements in surgical technique and introduction of mini-invasive techniques during the last decade.

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  • A further check on the refrigerant charge is described on pages 33 8. When vapour charging a system with an azeotropic refrigerant such as R502 the refrigerant cylinder must always be kept in a vertical position to prevent the possibility of liquid refrigerant from entering the compressor. This can create a dynamic pressure when the compressor starts, causing damage to valves or may even break piston connecting rods and damage pistons. The liquid refrigerant will also flush lubricating oil from bearing surfaces.

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  • Distribution in the Body proceeds rapidly, because the absorbing surface is greatly enlarged due to the formation of the epithelial brush border (submicroscopic foldings of the plasmalemma). The absorbability of a drug is characterized by the absorption quotient, that is, the amount absorbed divided by the amount in the gut available for absorption. In the respiratory tract, cilia-bearing epithelial cells are also joined on the luminal side by zonulae occludentes, so that the bronchial space and the interstitium are separated by a continuous phospholipid barrier.

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  • Tribology in a traditional form has been in existence since the beginning of recorded history. There are many well documented examples of how early civilizations developed bearings and low friction surfaces [1]. The scientific study of tribology also has a long history, and many of the basic laws of friction, such as the proportionality between normal force and limiting friction force, are thought to have been developed by Leonardo da Vinci in the late 15th century

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  • CHAPTER 21 LUBRICATION OF MACHINE ELEMENTS Bernard J. Hamrock Department of Mechanical Engineering Ohio State University Columbus, Ohio SYMBOLS 21.1 LUBRICATION FUNDAMENTALS 21.1.1 Conformal and Nonconformal Surfaces 21.1.2 Bearing Selection 21.1.3 Lubricants 21.1.4 Lubrication Regimes 21.1.5 Relevant Equations HYDRODYNAMIC AND HYDROSTATIC LUBRICATION 21.2.1 Liquid-Lubricated Hydrodynamic Journal Bearings 21.2.2 Liquid-Lubricated Hydrodynamic Thrust Bearings 21.2.3 Hydrostatic Bearings 21.2.4 Gas-Lubricated Hydrodynamic Bearings 508 512 512 513 516 518 520 21.

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  • This chapter provides you with information necessary to design a bevel- or hypoidgear set. It includes guidelines for selecting the type and size of a gear set to suit the application requirements. Equations and graphs are provided for calculating geartooth geometry, strength, surface durability, and bearing loads. Although the text provides sufficient data to design a gear set, reference is also made to appropriate American Gear Manufacturer's Association (AGMA) publications and

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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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  • (Hmin)0 = ^^ = 3.63£/°-68G°-49W-°-073 (1 - e-°-6*k°) R X,o = 3.63 X 2.087 X IQ-7 X 65.29 X 1.785 X 0.9919 - 0.876 x 10~4 Thus (hmin)0 = 0.876 X 10-4 R^ = 0.665 Aim In this case, the lubrication factor A is given by A (21.156) ° = [(0.175)2 + (0.0625)*r x 10-' = 3'58 (2U57) 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...

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  • Tribology in a traditional form has been in existence since the beginning of recorded history. There are many well documented examples of how early civilizations developed bearings and low friction surfaces [1]. The scientific study of tribology also has a long history, and many of the basic laws of friction, such as the proportionality between normal force and limiting friction force, are thought to have been developed by Leonardo da Vinci in the late 15th century.

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  • The third area of related work deals with creating 3-D models from 2-D sketches. Recently software has been developed that can construct a 3-D object from a 2D sketched drawing. For example, Teddy (Igarashi et al., 1997) models 3-D curved surfaces (such as a Teddy bear) from 2D freeform strokes. It creates a closed polygon from a stroke and finds a spine in center of the polygon. Next, it creates a 2D triangular mesh between the spine and the polygon perimeter, and then raises each spine vertex and smoothes the mesh. Digital Clay (Schweikardt and Gross, 2000) converts 2D...

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  • This section deals with "cosmetic" rust repairs, on panels that do not form part of the vehicles load-bearing structure. Any repairs to chassis, frame or mounting points of any type must be carried out to a professional standard, which is not the intended scope of this section. Rust repairs generally cover two areas; surface rust and rust holes (perforation ) Surface rust can usually be removed and held at bay successfully, perforated metalwork will need much more extensive work to provide a lasting repair.

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