Definition & axiom
⚠ Conflicts with the ISO 15926-4 primary definition
Label (EN)
gearbox
Label (PT-BR)
Definition (EN)
Definition (PT-BR)
Semi-formal axiom (Aristotelian)
Axiom type
LLM classification basis: structure-based → ⊑
Gearbox identity is primarily defined by its physical configuration - a gear casing containing an arrangement of two or more gear-wheels that transmit rotating motion between shafts. While it performs power transmission, the identity comes from the specific mechanical mechanism (gear wheels in a casing) rather than just the transmission function.
Validation status
Why primitive (necessary only)
Reviewer notes
FOL theory & disjointness
First-order logic theory (generated)
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Disjoint with
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Expert review
Axiomatization steps
1
Identity-Giving Function
✓ done
⚠ not anchored
PowerTransmissionFunction → PowerTransmissionProcess
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COPI-Core operation
⚠ Process parent
PlannedProcess reaches no COPI-Core operation, and no gap (out of scope / coverage gap) is recorded.
LLM rationale:
Gearboxes are designed to transmit mechanical power (force and motion) from input to output shaft, typically with speed/torque conversion. This is the generic function of all power transmission equipment.
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Expert review
2
Genus Proximus
✓ done
Assembly
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Genus (genus proximum)
Most specific superclass — may be a domain class like "Valve" or an IOF-Core root.
BFO/IOF-Core Root
bfo:Object branch
bfo:ObjectAggregate branch
bfo:ImmaterialEntity branch
LLM rationale:
No domain-specific superclass exists in the parent candidates or enriched classes. Gearbox is a causally unified artefact with physically connected removable subcomponents (gears, shafts, casing, bearings) that can be disassembled for maintenance while maintaining a single causal boundary during operation.
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Expert review
3
Differentia Specifica
✓ done
∃hasComponentPartAtAllTimes.GearCasing ⊓ ∃hasComponentPartAtAllTimes.GearWheel ⊓ ∃hasComponentPartAtAllTimes.InputShaft ⊓ ∃hasComponentPartAtAllTimes.OutputShaft ⊓ (≥2 hasComponentPartAtAllTimes.GearWheel)
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Conditions that distinguish
Gearbox
from sibling classes under genus
Assembly.
Only what is not already entailed by the genus.
Differentia expression
Differentia (natural language)
LLM rationale:
The differentia captures the essential structural elements that make a gearbox distinct: the specific configuration of gear casing, multiple gear-wheels (minimum two), and input/output shafts. This mechanical arrangement is what distinguishes gearboxes from other power transmission devices.
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Expert review
4
Necessary Parts
✓ done
GearCasing, GearWheel, InputShaft, OutputShaft
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Consider part-whole relations beyond subsumption:
hasComponentPartAtAllTimes (universal, structurally essential)
· hasComponentPartAtSomeTime (contingent, optional component)
LLM rationale:
These parts constitute the minimal structural requirements for any gearbox - the casing provides containment, the gear-wheels provide the transmission mechanism, and the shafts provide input/output interfaces.
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Expert review
5
Process Participation Signature ⟨I, O, T⟩
✓ done
∅ → ∅
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Inputs (I)
Outputs (O)
Transformation (T)
LLM rationale:
Gearboxes receive rotational mechanical power at one shaft and deliver it at another shaft, typically with changed speed and torque characteristics determined by gear ratios.
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Expert review
More
Alternative labels
none
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Synonyms / alternative labels (comma-separated) — skos:altLabel
Language auto-detected on export (PT if the label contains accents, EN otherwise).
Properties as BFO qualities
0 of 1 selected
▼
Select which CFIHOS/DEXPI properties inhere in every instance of Gearbox as
bfo:Quality subclasses.
Each selected property →
:GearboxQuality ⊑ bfo:Quality, inheres in :Gearbox
Custom axioms
none
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Axioms not produced by the pipeline. Each is appended verbatim as an
rdfs:subClassOf restriction on Gearbox.
Write the restriction block in Turtle syntax (without the leading
rdfs:subClassOf).
Example: [ owl:onProperty :hasPart ; owl:someValuesFrom :Wellhead ]
Cross-standard divergences
none detected yet
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Click "Detect divergences" to analyse cross-standard disagreements for this cluster.
