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gear lubricants

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Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006354
EISBN: 978-1-62708-192-4
... Abstract This article is concerned with gear tooth failures influenced by friction, lubrication, and wear, and especially those failure modes that occur in wind-turbine components. It provides a detailed discussion on wear (including adhesion, abrasion, polishing, fretting, and electrical...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006820
EISBN: 978-1-62708-329-4
... lubrication, the measurement of the backlash, and the necessary factors for starting the failure analysis. Next, the article explains various gear failure causes, including wear, scuffing, Hertzian fatigue, cracking, fracture, and bending fatigue, and finally presents examples of gear and reducer failure...
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Published: 31 December 2017
Fig. 4 Plot of dynamic viscosity versus bulk temperature for non-VI-improved mineral oil and ester-based gear lubricants More
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Published: 31 December 2017
Fig. 3 Plot of pressure-viscosity coefficient versus bulk temperature for non-VI-improved mineral oil and ester-based gear lubricants More
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006356
EISBN: 978-1-62708-192-4
... on or containing PAOs. The properties include Noack volatility and pour point. The article also discusses the properties and applications of heavy-duty engine oil (HDEO), industrial lubricants, food-grade lubricants, greases, transportation gear oils, compressor oils, hydraulic fluids, and transmission fluids...
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Published: 01 January 1996
Fig. 7 Regimes of lubrication for carburized gears of normal industry quality material (Grade 1 material, per Ref 2 ) More
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006411
EISBN: 978-1-62708-192-4
... Abstract The function of lubricants is to control friction and wear in a lubricating system containing machine elements such as gears and bearings. This article discusses the basic properties of lubricants to help scientists and engineers understand the principles behind lubricant selection...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006405
EISBN: 978-1-62708-192-4
..., applications that put more demand on the lubricant (engine oils and automotive gear oils) require superior additives than less-demanding applications, such as industrial lubricants and metalworking fluids. Lubricant Types and Additives Lubricants can be broadly classified as either internal combustion...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006399
EISBN: 978-1-62708-192-4
... in piston-cylinder conjunctions, engine bearings, and transmission and differential gearing systems. power train systems friction lubrication wear surface roughness lubricant rheology piston-cylinder conjunctions bearings gearing systems Introduction Tribology is the study of friction...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002375
EISBN: 978-1-62708-193-1
... Abstract This article summarizes the various kinds of gear wear, including fatigue, impact fracture, wear, and stress rupture, describes how gear life in service is estimated. It presents the rules concerning lubricants in designing gearing and analyzing failures of gears. The article presents...
Book Chapter

Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006358
EISBN: 978-1-62708-192-4
...” in this Volume for a discussion of lubricant selection. Gears As previously mentioned, the wear modes experienced by gears usually involve both rolling and slip or sliding. Dudley ( Ref 2 ) has described the wear of gear teeth, noting that the relative amount of sliding increases as the number of teeth...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003327
EISBN: 978-1-62708-176-4
... a significant area is considered failure. A gear in this condition is shown in Fig. 3 . Fig. 3 Specimen gear with micropitting (frosting) failure As cracks progress further into the surface, the rate of propagation increases. This increase is related in part to lubricant (under contact pressure...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006429
EISBN: 978-1-62708-192-4
... effect. Fig. 7 Contour plots of the cam ring temperature Δ t C5 for varying discharge pressure p d and rotational speed N of the vane pump for different inlet oil temperatures t in (VG32, t in = 50 °C, or 120 °F) Thermal Lubrication Characteristics of Gear Pumps Hydraulic...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003571
EISBN: 978-1-62708-180-1
... failure of an antifriction bearing, a nylon driving gear, and a polyoxymethylene gear wheel. antifriction bearing cohesive wear elastomers glassy thermoplastics interfacial wear lubricant mechanical properties nylon nylon driving gear plastics polyoxymethylene gear wheel semicrystalline...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002401
EISBN: 978-1-62708-193-1
... stresses at and below the contact surfaces and briefly summarizes bearings and gear characteristics. The article provides an overview of the key types of gear and bearing steels. It analyzes two types of macropitting that result from the subsurface growth of fatigue cracks, namely, subsurface-origin...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002373
EISBN: 978-1-62708-193-1
... of medium-hardened gears. Source: Ref 4 Another form of contact fatigue, known as micropitting, occurs in bearings. An example is shown in Fig. 6 . This feature can show up over the entire raceway surface. It is often the result of too thin a lubricant film or excessive surface roughness...
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Published: 31 December 2017
Fig. 17 Gear life as a function of specific film thickness (λ) in the boundary lubrication (BL) regime, the mixed lubrication (ML) regime, and in the elastohydrodynamic lubrication (EHL) regime More
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006403
EISBN: 978-1-62708-192-4
... tribological systems Table 1 Structural components of typical tribological systems Tribosystem Triboelements Interfacial element (3) Ambient medium (4) System structure (1) (2) Bearing Shaft Bushing Lubricant Oil mist Closed Gear drive Drive gear Driven gear Lubricant Air...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001815
EISBN: 978-1-62708-180-1
... lubricants. Gear-Tooth Contact The way in which tooth surfaces of properly aligned gears make contact with each other is responsible for the heavy loads that gears are able to carry. In theory, gear teeth make contact along lines or at points; in service, however, because of elastic deformation...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006850
EISBN: 978-1-62708-395-9
... Thermoplastics Elastomers Glassy Thermoplastics Example 2—Failure of an Acetal Gear Wheel Summary and Case Study Failure Examples Example 1—Wear Resistance of Polyurethane Elastomeric Coatings Environmental and Lubricant Effects on the Wear Failures of Polymers Case Study—Nylon...