ISO 7967-3:2022

Overview

ISO 7967-3:2022 - "Reciprocating internal combustion engines - Vocabulary of components and systems - Part 3: Valves, camshaft drives and actuating mechanisms" is an international terminology standard that defines terms related to valves, camshaft drives, and actuating mechanisms used in reciprocating internal combustion engines. This third edition (2022) updates and extends the vocabulary used by engine designers, manufacturers and technical authors to ensure consistent, unambiguous language across documentation, design and maintenance.

Key topics

• Scope and purpose
  • Establishes a standardized vocabulary for components and systems that control valve events, camshaft rotation and actuation.
  • Part of the ISO 7967 series; complements ISO 2710-1 (engine classification and basic terms).
• Camshaft terminology
  • Terms such as camshaft, one-piece camshaft, hollow camshaft, assembled camshaft, cam and camshaft signal wheel.
• Camshaft drives
  • Vocabulary for gear drive, chain drive, synchronous belt drive and associated parts: sprocket wheel, timing chain, timing belt, tensioners, idler assemblies and variable valve timing elements.
• Valve components
  • Definitions for poppet valve, inlet and exhaust valves, hollow valve, valve spring, valve guide, valve seat insert, valve stem seal, valve cage, retainers and collets.
• Actuating mechanisms
  • Terms covering tappets (sliding, roller, hydraulic), cam followers, push-rods, rocker arms and supports, valve bridges, valve rotators, variable valve lift mechanisms and common layouts (SOHC, DOHC, OHV).
• Standards context
  • No normative references are included. The third edition supersedes ISO 7967-3:2010 with modified and added definitions.

Practical applications

ISO 7967-3:2022 is useful for:

• Engine designers and OEMs creating technical drawings, parts lists and assembly instructions.
• Service and maintenance organizations producing manuals and diagnostic procedures.
• Technical translators and documentation specialists ensuring consistent terminology across languages.
• Procurement and compliance teams specifying components and parts by standardized names.
• Standards committees and educators referencing a common engine-component vocabulary.

Who uses it

• Automotive, marine and power-generation engine manufacturers
• Aftermarket parts suppliers and maintenance workshops
• Technical writers, translators and training organizations
• Regulatory and conformity-assessment bodies

Related standards

• ISO 7967 series (other parts covering different engine systems)
• ISO 2710-1 - Reciprocating internal combustion engines - Vocabulary - Part 1

Keywords: ISO 7967-3, valves, camshaft drives, actuating mechanisms, reciprocating internal combustion engines, engine components vocabulary, engine terminology.