机械设计基础0（Fundamentals of mechanical design 0）.doc

机械设计基础0（Fundamentals of mechanical design 0） Coupling - connecting two shafts, transmitting movement and torque. Not open at work. Clutch - ditto. You can open it whenever you like. The brakes force the machine to stop using frictional resistance. The friction state of sliding bearing friction (without lubricant) boundary friction (boundary film adsorption two friction surface is very thin (two) liquid friction friction surface completely by liquid (separated) mixed friction between friction and boundary friction between liquid). Composition: bearing seat, bearing, lining, lubrication, sealing device. Bush failure form: wear. Lubrication purpose: reduce friction power consumption, reduce wear rate, cool, dustproof, anti rust, vibration absorption. Lubricating material: lubricating oil and grease. Dynamic oil film: a pressure oil film formed in the clearance of a bearing by relative motion Rolling bearing structure: inner ring, outer ring, rolling body cage. Type: 1 self-aligning ball bearings 2 spherical roller bearing 3 tapered roller bearings B thrust ball bearing contact angle increase 5 6 7 deep groove ball bearing angular contact ball bearing C15 degrees AC25 degrees B40 degrees (axial radial roller ball) Code name: 5 type 3 width series (for 0 can be omitted), 3 diameter series 2 and 1, inner diameter mm, rear means internal structure seal, dustproof /P0 (not note) 0 level, accuracy /P6 six Failure modes of rolling bearings: fatigue failure and permanent deformation. Calculation criteria: contact fatigue life calculation and static strength calculation of slewing rolling bearings under general working conditions, swing or low speed, only static strength calculation, high speed for life calculation and verification of bearing limit speed. Loading capacity: the basic rated dynamic load: anti fatigue pitting resistance, C basic rated static load: plastic deformation resistance C0 Bearing life: fatigue occurs before pitting corrosion: total revolution or time Reli