tailieunhanh - lubricants and hydraulic fluids Episode 2 Episode 5

Tham khảo tài liệu 'lubricants and hydraulic fluids episode 2 episode 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | EM 1110-2-1424 28 Feb 99 will adequately lubricate the bearings while the EP additive will protect the gear teeth from the effects of using a low-viscosity oil. 9-10 EM 1110-2-1424 28 Feb 99 Chapter 10 Bearings 10-1. General Bearings can be divided into two subgroups plain bearings and rolling-contact bearings. Both have their place in the world of machines. Each type has some obvious advantages and disadvantages but there are subtle properties as well that are often ignored. Each type of bearing can be found in a multiplicity of places and each can be lubricated with either oil or grease. Some bearings are lubricated by water and some are lubricated by air as in the case of a dentist s drill . 10-2. Plain Bearings Plain bearings consist of two surfaces one moving in relation to the other. Plain bearings can be the journal type where both wear surfaces are cylindrical thrust type where there are two planar surfaces one rotating upon the other and various types of sliding bearings where one surface slides in relation to the other. All depend upon a lubricating film to reduce friction. Unless an oil pump is provided to generate the oil film these bearings rely on shaft motion to generate a hydrodynamic oil wedge. a. Advantages of plain bearings. 1 They have a very low coefficient of friction if properly designed and lubricated. 2 They have very high load-carrying capabilities. 3 Their resistance to shock and vibration is greater than rolling-contact bearings. 4 The hydrodynamic oil film produced by plain bearings damps vibration so less noise is transmitted. 5 They are less sensitive to lubricant contamination than rolling-contact bearings. b. Types of plain bearings. 1 Journal sleeve bearings . These are cylindrical with oil-distributing grooves. The inner surface can be babbitt-lined bronze-lined or lined with other materials generally softer than the rotating journal. On horizontal shafts on motors and pumps oil rings carry oil from the oil reservoir up to the .

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