vocabulary:
  name: Timken Vocabulary
  description: >-
    Vocabulary and taxonomy for Timken engineered bearings and industrial motion products
    covering bearing types, specifications, applications, and engineering concepts.
  version: '1.0'
  created: '2026-05-03'
  modified: '2026-05-03'

terms:
  - term: Bearing
    definition: >-
      A mechanical element that constrains relative motion to only the desired
      motion while reducing friction between moving parts. Timken manufactures
      various bearing types for industrial, automotive, and aerospace applications.
    tags:
      - Core Product
      - Mechanical

  - term: Tapered Roller Bearing
    definition: >-
      A rolling-element bearing that accommodates combined axial and radial loads.
      Timken's original bearing invention, used extensively in wheel hubs, axles,
      and gearboxes requiring both radial and thrust load support.
    tags:
      - Bearing Type
      - Core Product

  - term: Ball Bearing
    definition: >-
      A rolling-element bearing using spherical balls to maintain separation between
      bearing races, suitable for lower load applications requiring high speed.
    tags:
      - Bearing Type

  - term: Cylindrical Roller Bearing
    definition: >-
      A rolling-element bearing using cylinders rather than balls, providing
      high radial load capacity with minimal axial load capability.
    tags:
      - Bearing Type

  - term: Spherical Roller Bearing
    definition: >-
      A bearing with barrel-shaped rollers that self-align to compensate for
      shaft misalignment, suitable for heavy loads and shock applications.
    tags:
      - Bearing Type

  - term: Thrust Bearing
    definition: >-
      A rotational bearing designed primarily to support axial (thrust) loads
      perpendicular to the shaft axis.
    tags:
      - Bearing Type

  - term: Precision Bearing
    definition: >-
      High-accuracy bearings manufactured to tight tolerances for applications
      requiring minimal runout, such as machine tool spindles and medical devices.
    tags:
      - Bearing Type
      - High Precision

  - term: Housed Unit
    definition: >-
      A pre-assembled bearing and housing combination that simplifies mounting
      in industrial equipment. Available in various housing configurations.
    aliases:
      - Pillow Block
      - Housed Bearing
    tags:
      - Bearing Assembly
      - Mounting

  - term: Dynamic Load Rating (C)
    definition: >-
      The calculated load a bearing can theoretically endure for one million
      revolutions with 90% reliability, measured in kilonewtons (kN).
    aliases:
      - C Rating
      - Basic Dynamic Load Rating
    tags:
      - Specification
      - Load

  - term: Static Load Rating (C0)
    definition: >-
      The maximum static load a bearing can sustain without causing permanent
      deformation that would impair operation, measured in kilonewtons (kN).
    aliases:
      - C0 Rating
    tags:
      - Specification
      - Load

  - term: Bore Diameter
    definition: >-
      The inner diameter of a bearing's bore that fits onto the shaft,
      expressed in millimeters.
    tags:
      - Dimension
      - Specification

  - term: Outside Diameter
    definition: >-
      The outer diameter of a bearing that fits into the housing bore,
      expressed in millimeters.
    tags:
      - Dimension
      - Specification

  - term: Bearing Life
    definition: >-
      The calculated operating life of a bearing under specific load and speed
      conditions, typically expressed as L10 life (hours for 90% survival rate).
    aliases:
      - L10 Life
      - Fatigue Life
    tags:
      - Performance
      - Reliability

  - term: Seal
    definition: >-
      A device that closes gaps between stationary and moving parts in mechanical
      equipment, preventing lubricant loss and contaminant entry. Timken offers
      grease and oil seals for various applications.
    tags:
      - Product
      - Sealing

  - term: Lubrication
    definition: >-
      The application of grease or oil to bearing surfaces to reduce friction,
      prevent wear, and dissipate heat. Timken offers automated lubrication systems
      including the BEKA and Groeneveld product lines.
    tags:
      - Maintenance
      - System

  - term: Syber
    definition: >-
      Timken's proprietary bearing system analysis software for calculating
      bearing life, load distribution, and performance across complete bearing
      arrangements.
    aliases:
      - Timken Syber
    tags:
      - Software
      - Engineering Tool

  - term: Industrial Motion
    definition: >-
      A broad category of Timken products beyond bearings including gear drives,
      belts, clutches, brakes, couplings, chain, and linear motion solutions.
    tags:
      - Product Category
      - Portfolio

  - term: CAD Drawing
    definition: >-
      Computer-aided design dimensional drawings available for download from the
      Timken engineering portal for use in mechanical design and procurement.
    tags:
      - Engineering Resource
      - Design

  - term: Speed Rating
    definition: >-
      The maximum rotational speed at which a bearing can operate continuously
      under specified lubrication conditions, expressed in RPM.
    tags:
      - Specification
      - Performance