TAILIEUCHUNG - Kinematics and Mechanisms 2008 Part 9

Tham khảo tài liệu 'kinematics and mechanisms 2008 part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 23 Crankshaft Journal Bearings Role of the Journal Bearings in the Internal Combustion Engine Construction of Modern Journal Bearings The Function of the Different Material Layers in Crankshaft Journal Bearings The Bearing Materials Basics of Hydrodynamic Journal Bearing Theory Load-Carrying Ability The Bearing Assembly Housing The Bearing Crush Other Factors Affecting Bearing Assembly The Design Aspects of Journal Bearings Derivations of the Reynolds and Harrison Equations for Oil Film Pressure P. K. Subramanyan Glacier Clevite Heavywall Bearings In modern internal combustion engines there are two kinds of bearings in the category of crankshaft journal bearings namely the main bearings and the connecting rod bearings. Basically these are wraparound semicylindrical shell bearings. Two of them make up a set and depending on the position in the assembly one is called the upper and the other the lower bearing. They are of equal sizes. The main bearings support the crankshaft of the engine and the forces transmitted to the crankshaft from the cylinders. The connecting rod bearings or simply rod bearings are instrumental in transferring the forces from the cylinders of the internal combustion engine to the crankshaft. These connecting rod bearings are also called big end bearings or crank pin bearings. Supporting the crankshaft and transferring the pressure-volume work from the cylinders to the pure rotational mechanical energy of the crankshaft are accomplished elegantly with minimal energy loss by shearing a suitable lubricating medium between the bearings and the journals. The segment of the crankshaft within the bounds of a set of bearings whether main bearings or rod bearings is called the journal. Consequently these bearings are called journal bearings. Role of the Journal Bearings in the Internal Combustion Engine The crankshafts of internal combustion engines of sizes from small automotive to large slow-speed engines

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