ABMA 8.2:1999(S2010) pdf download

ABMA 8.2:1999(S2010) pdf download.BALL AND ROLLER BEARING MOUNTING ACCESSORIES INCH DESIGN
1. Scope
Mounting accessories covered in this standard are commonly used for the location or fixing of ball and roller bearings to the shaft of a machine or mechanism. The purpose of the standard is to establish dimensions and minimum physical properties of these components consistent and compatible with ABMA and ANSI Standards relating to ball and roller bearings. Products manufactured in accordance with this standard will fulfill the expected function when used with properly-designed shafts. This standard covers: 1.1 Locknuts and removal nuts – Locknuts and removal nuts for ball bearings, cylindrical, spherical, and tapered roller bearings. 1.2 Locking devices – Lockwashers and lockplates for ball bearings, cylindrical, spherical and tapered roller bearings. 1.3 Mounting sleeves – Adapter sleeves and withdrawal sleeves, for ball bearings and spherical roller bearings. 1.4 Shaft dimensions – Required dimensions for threads, keyways, and reliefs for shafts. 1.5 General information – Symbols, definitions, part numbers, materials, tolerances, and threads.
2. Identification code
2.1 Definitions 2.1.1 Locknuts and removal nuts 2.1.1.1 Bearing locknut – A fastener with internal threads utilized to secure and/or position the inner ring of a rolling element bearing to a shaft or mounting sleeve. (Some sizes may be used as removal nuts.) 2.1.1.2 Removal nut – A fastener with internal threads utilized to facilitate disassembly of a bearing from the withdrawal sleeve.2.1.1.3 Face runout – A dimensional characteristic denoting total indicator reading at the locknut chamfer face while locknut is rotated one revolution on the axis of its threaded pitch diameter. Also denoted as squareness of the face with thread. 2.1.1.4 Locknut slot – Slots are provided on the outer diameter of locknuts and removal nuts. These slots aid in tightening with a spanner wrench or other types of turning tools and permit locking of the nut in final position, except on larger locknuts utilizing lockplates rather than lockwashers. 2.1.1.5 Chamfer face – The locknut face adjoining large O.D. chamfer, the face normally positioned against lockwasher or bearing. 2.1.1.6 Face parallelism – A term defining the parallel relationship between the chamfer face of the locknut and the opposite face of locknut.2.1.2 Locking devices 2.1.2.1 Lockwasher – A washer used in conjunction with bearing locknut to maintain in locking engagement the adjusted or tightened position of a bearing locknut with respect to the shaft or mounting sleeve. A washer key tang projects from the lockwasher bore, to engage a key slot in the shaft or mounting sleeve. The O.D. periphery of the lockwasher is provided with a quantity of tangs, one of which is bent down into a locknut slot to provide the locking of the mounting system. 2.1.2.2 Key tang – The tang projecting inwardly from the bore of lockwasher is designed to engage with a shaft or mounting sleeve key slot. The key tang is either bent at 90° to one face of lockwasher or is straight, depending on type of lockwasher. 2.1.2.3 Locking tang – A tang on outer periphery of lockwasher, which engages with a locknut slot. A quantity of equally-spaced tangs is provided, with an appropriate single tang bent into engagement with a locknut slot to complete locking of system. 2.1.2.4 Lockplate – A locking device bolted to the face of large inch designed locknuts after final positioning of the locknut on shaft or mounting sleeve. The lockplate is a flat stamped metal plate with a projecting key for engagement with shaft or mounting sleeve key slot. Two holes at appropriate spacing mate with drilled and tapped holes on the exposed face of locknut.2.1.3 Mounting sleeves 2.1.3.1 Adapter sleeve – A sleeve utilized for mounting of a tapered bore bearing to a straight shaft. The sleeve has a tapered O.D. for engagement with a tapered bore bearing, and a threaded O.D. end portion for a bearing locknut. The adapter sleeve is pulled into the tapered bearing bore by tightening the locknut Compression of the sleeve by the tapered engagement results in tightening of the slotted adapter sleeve to the straight shaft. 2.1.3.2 Adapter assembly – An assembly consisting of the adapter sleeve, the appropriate locknut and a lockwasher or lockplate (larger sizes utilize a lockplate). The assembly of lockplate type includes two cap screws and lock wire.