bearing
Enable an agent to recognise a mechanical bearing, assess its ability to support load while permitting intended relative motion, and determine suitable selection, inspection and maintenance actions.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognise a mechanical bearing, assess its ability to support load while permitting intended relative motion, and determine suitable selection, inspection and maintenance actions.
A bearing is a machine element that supports and guides relative motion between components while transmitting loads and limiting friction.
It can be Classify a bearing by support principle, motion and load role.; Screen candidates against duty, mounting interfaces and documented operating limits.; Determine applicable installation, alignment, clearance and preload checks.; Assess inspection and monitoring evidence for bearing deterioration.; Select documented lubrication, servicing or replacement actions appropriate to the bearing family.; Identify conditions requiring shutdown or restricted operation using host-machine procedures..
Distinguishing features
It supports or locates another member under load while allowing specified relative motion across an interface.
Its operating principle manages that motion through sliding contact, rolling contact, a fluid film or a magnetic field; rolling elements are not required.
Unlike a coupling, its defining role is supporting and guiding relative motion rather than transmitting drive torque between shafts.
Unlike a seal, its defining role is carrying load and guiding motion rather than controlling fluid leakage or contaminant entry.
A sleeve or bushing belongs here when its intended duty is bearing support; its cylindrical shape alone is insufficient.
Scope
+ Bearing principles, construction families and supported relative motions
+ Radial, axial and combined load support and transmission
+ Interfaces, fits, clearance, preload and alignment requirements
+ Lubrication, auxiliary supplies and operating limits where applicable
+ Condition assessment, failure mechanisms and bearing-specific interventions
- Navigational bearings and angular direction measurements
- Complete shafts, gearboxes, motors and other host machines
- Structural supports that do not accommodate intended relative motion
- Lubricant manufacture and general lubrication-system design
- Product catalogue administration and individual asset lifecycle records
Characteristics
- Support principle
- rolling-element | plain sliding | fluid-film | magnetic | hybrid | unresolved Determines the applicable load, friction, supply and failure models.
- Permitted motion
- rotation | oscillation | linear translation | combined Separates intended movement from play, slip or displacement indicating a fault.
- Load and locating role
- radial | axial | combined; locating | floating | other arrangement Identifies which forces and displacements the bearing arrangement must accommodate.
- Applied load
- radial and axial force in N; supported moment in N·m where applicable; associated duty history Provides the demand against which an applicable capacity model can be evaluated.
- Capacity basis
- applicable rating, calculation method or supplier limit, with assumptions and source Prevents ratings for one bearing principle or duty from being treated as universal.
- Motion rate
- rotational speed in r/min, translation speed in m/s, or oscillation amplitude in degrees and frequency in Hz Affects heating, lubrication and permissible operating duty.
- Interface geometry
- bore, outside diameter, width and mounting dimensions in mm, with tolerances Establishes dimensional compatibility without assuming matching dimensions imply interchangeability.
- Clearance or preload
- clearance in µm or preload in N, with direction, temperature and assembly state Influences stiffness, load distribution, heat generation and freedom of motion.
- Working surface construction
- surface materials, coatings, liner and rolling-element materials where applicable Constrains wear behaviour, chemical compatibility and lubrication requirements.
- Lubrication and auxiliary dependence
- specified lubricant, self-lubricating material, fluid supply or magnetic support and control system Identifies resources whose absence or degradation can invalidate operation.
- Operating temperature
- °C at a specified measurement location and operating condition Supports assessment of thermal limits and changes in clearance or lubricant behaviour.
- Condition assessment
- unassessed | serviceable under stated conditions | degraded | failed; evidence and assessment date Connects observations to operational decisions without treating a single symptom as a diagnosis.
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 19 findings · 29 questions.
Support principle and motion Establishes what makes the component a bearing and how it supports intended movement.
Bearing families share a support function but require different descriptions of contact, motion and dependence on external systems.
Bearing identity
Defines the mechanical sense and component boundary.
Load-supporting motion interface
Record the supported member, supporting member and intended relative motion that establish the bearing function.
- Which members does the bearing support relative to each other, and what movement must remain possible? definition
- Does the identified item perform the bearing function itself, or is it a housing, seal, coupling or complete bearing assembly? boundary
Support mechanism
Describes how forces cross the moving interface.
Contact and separation
Record whether support uses sliding surfaces, rolling elements, fluid pressure, magnetic forces or a combination, including changes during startup and shutdown.
- What mechanism carries the load during normal operation? definition
- How does load support change at rest, during startup or after loss of an auxiliary supply? boundary
Load, motion and capacity Connects bearing duty to an appropriate basis for evaluating capacity and useful service.
A bearing cannot be judged suitable from dimensions or a load rating detached from its assumptions.
Applied duty
Captures forces and movement over the relevant operating cycle.
Load and motion history
Record load direction, magnitude, shocks and motion patterns, including oscillation and periods of standstill under load.
- What radial, axial and moment loads occur, including shocks and reversals? measurement
- What speeds, oscillation amplitudes, travel lengths and dwell periods describe the duty cycle? measurement
Capacity interpretation
Associates limits and life estimates with the bearing family and their stated conditions.
Applicable rating basis
Record the source and assumptions of capacity limits, speed limits and any life estimate rather than treating different rating systems as interchangeable.
- Which supplier documentation or issuing-body standard defines each rating, and does its scope cover this bearing and duty? provenance
- Which assumptions about load, lubrication, temperature, reliability and installation constrain use of the rating or life estimate? boundary
Mounting and internal geometry Describes how installation establishes the bearing's geometry and load path.
Fits, alignment and locating arrangements can make a dimensionally compatible bearing unsuitable or cause premature damage.
Seating and location
Captures shaft, housing, guide and retention interfaces as applicable.
Fits and locating arrangement
Record seating dimensions, tolerances, retention and the arrangement's provision for intended axial or thermal movement.
- What mounting dimensions, fits, shoulder geometry and retention features are required? measurement
- Which bearing or interface locates the supported member, and where is thermal expansion accommodated? boundary
Operating geometry
Distinguishes unmounted geometry from conditions after assembly and heating.
Clearance, preload and alignment
Record the applicable clearance, preload, gap and alignment requirements with their measurement state.
- What clearance, preload or support gap is required before installation and at operating temperature? measurement
- How must alignment and adjustment be checked, and what documented limits determine acceptance? action
Lubrication, supplies and environment Identifies the conditions and supporting resources needed to sustain bearing operation.
Lubrication needs, contamination sensitivity and supply-loss behaviour vary substantially across bearing principles.
Working interface support
Captures lubricant and auxiliary requirements without assuming every bearing needs external lubrication.
Lubricant and auxiliary requirements
Record applicable lubricant specifications, replenishment arrangements, fluid supply conditions or magnetic support dependencies.
- What lubricant, self-lubricating material, fluid supply or electrical support does this bearing require? definition
- Which supply parameters must be monitored, and what action is specified if support is lost? action
Thermal and contamination exposure
Relates the service environment to working surfaces, protection and heat removal.
Environmental operating envelope
Record temperature limits, contaminant exposure, material compatibility and protective arrangements relevant to the selected bearing construction.
- What temperatures and contaminant exposures occur at the bearing, and where are they measured or assessed? measurement
- What evidence establishes that the bearing materials, lubricant and seals are compatible with those conditions? provenance
Condition and intervention Connects bearing-specific evidence to diagnosis and justified service actions.
Symptoms can arise from the bearing or its installation, and intervention must address the mechanism behind deterioration.
Degradation evidence
Organises observations according to the bearing principle and operating context.
Symptoms and failure mechanisms
Record evidence for applicable mechanisms such as surface fatigue, wear, seizure, corrosion, electrical erosion, film loss or loss of magnetic support, retaining alternative explanations.
- What changes in vibration, temperature, friction, play, lubricant debris or support signals have been observed under comparable duty? measurement
- Which evidence distinguishes bearing damage from misalignment, imbalance, mounting looseness or a failing auxiliary system? boundary
Service and return to operation
Defines applicable intervention choices and acceptance evidence.
Bearing-specific service decision
Record whether adjustment, relubrication, cleaning, specialist refurbishment or replacement is permitted, and what installation and operating checks justify return to service.
- Which documented criteria require continued monitoring, service, replacement or shutdown for this bearing and host duty? action
- What mounting method and post-service checks confirm that support, clearance or preload, lubrication and operating behaviour are acceptable? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- The mechanical sense is inferred from PHY.OBJ; no sense was supplied.
- The kinds overlap: fluid-film bearings are often classified within plain bearings, while radial, thrust and linear describe additional classification axes.
- Standards and designations are recalled without source consultation; verify applicable editions, manufacturer suffixes and application-specific dimensions before engineering use.
- Which of these check these first hold for the sense of bearing this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Plain bearings
- Ball bearings
- Roller bearings
- Hydrostatic fluid-film bearings
- Hydrodynamic fluid-film bearings
- Magnetic bearings
- Which of these kinds and varieties hold for the sense of bearing this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Rolling-bearing basic designation - 6205 - A common designation for a single-row deep-groove ball bearing with a 25 mm bore; suffixes specify features such as seals, internal clearance and precision and can vary by manufacturer.
- Which of these identifiers and schemes hold for the sense of bearing this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- ISO 281 - International Organization for Standardization: rolling-bearing dynamic load ratings and rating life.
- ISO 76 - International Organization for Standardization: rolling-bearing static load ratings.
- ISO 15 - International Organization for Standardization: boundary dimensions and general plan for radial rolling bearings.
- ISO 492 - International Organization for Standardization: geometrical product specifications and tolerance values for radial rolling bearings.
- ISO 15243 - International Organization for Standardization: terms, characteristics and causes of rolling-bearing damage and failures.
- Which of these standards and regulation hold for the sense of bearing this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Supporting rotating shafts in electric motors, pumps and gearboxes.
- Carrying radial and axial loads in vehicle wheel hubs.
- Guiding linear motion in machine tools and automation equipment.
- Supporting turbine and engine shafts using fluid-film bearings.
- Allowing articulation in machinery through plain or spherical bearings.
- Which of these real-world use hold for the sense of bearing this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Bore diameter - Approximately 3-100 for many small machinery rolling bearings; larger industrial bearings extend far beyond this interval. - mm
- Basic rating life - No universal typical range; calculated from load rating and equivalent load under specified assumptions, conventionally at 90% reliability. - million revolutions
- Which of these typical measurements hold for the sense of bearing this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Rolling-contact fatigue can cause raceway or rolling-element spalling, vibration and eventual loss of function.
- Inadequate lubrication can cause wear, overheating, surface damage and seizure.
- Contamination or moisture can produce abrasive wear, indentations and corrosion.
- Overload, misalignment or improper installation can damage contact surfaces and accelerate failure.
- Electrical current through a bearing can cause erosion and fluting, particularly in motor applications.
- Which of these failure modes and hazards hold for the sense of bearing this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Metric and inch-series bearings coexist; replacement requires checking dimensions and designation conventions.
- ISO tolerance classes and ABMA/ABEC terminology occur in different supply chains; class labels require careful comparison.
- Which of these regional variation hold for the sense of bearing this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Bushing - A bushing used to support sliding motion is a form of plain bearing; bushings used only as sleeves, spacers or insulators are not necessarily bearings.
- Bearing housing - A housing locates and supports a bearing in the machine structure; the bearing provides the interface for relative motion.
- Shaft coupling - A coupling joins shafts to transmit torque; a bearing primarily supports and guides motion while reacting loads.
- Lubricant - A lubricant reduces friction and wear at moving interfaces; it is a working material rather than the complete bearing element.
- Bearing direction - A navigational bearing is an angular direction, whereas this entry covers the physical machine element.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of bearing this model covers, and on what evidence? provenance
What the second pass must settle
- Does the registry intend bearing to include linear, magnetic, fluid-film, flexure and civil structural bearings, or should some be linked neighbouring concepts?
- Does an existing Vercy world model already cover this mechanical bearing concept and therefore provide the authoritative publication?
- Which current standards and issuing bodies govern terminology, dimensions, tolerances, ratings and damage classification for each included bearing family?
- Which sourced capacity and dimensional examples would represent the included families without implying universal operating ranges?
- Where should the publication draw the boundary between a bearing element, an integrated bearing unit and its housing or auxiliary support system?