Definition

1. Noun:
   • A mechanical component that transmits motion: Specifically, a rigid bar that connects moving parts in a machine, most commonly used to convert the rotating motion of a wheel or crankshaft into the reciprocating (back-and-forth) motion of a piston, or vice versa.

Usage

• The connecting rod is a critical component in internal combustion engines, linking the piston to the crankshaft.
• In machinery, a connecting rod must be strong enough to withstand significant forces without bending or breaking.

Examples

Advanced Usage

• "Big end" and "small end": The ends of a connecting rod are often referred to specifically. The big end is the larger end that connects to the crankshaft, while the small end (or little end) is the smaller end that connects to the piston via a gudgeon pin or wrist pin.
  • The bearing at the big end of the connecting rod failed, causing engine damage.

Variants and Related Words

• Conrod (n): A common abbreviation for "connecting rod" used in engineering and automotive contexts.
  • The race car's engine uses titanium conrods for reduced weight.

Synonyms

• Link rod: A general term for a rod that provides a connecting link in a mechanism.
• Piston rod: While similar, a piston rod typically refers to the rod attached directly to the piston in certain types of engines (like steam engines), which is then connected to a crosshead and another rod. It is a related but distinct component.

Related Phrases and Technical Terms

• Connecting rod bolt: The bolt that secures the bearing cap to the big end of the connecting rod.
  • Always torque the connecting rod bolts to the manufacturer's specification.
• Connecting rod bearing: The bearing surface (often a sleeve or insert) between the connecting rod and the crankshaft journal.
  • A worn connecting rod bearing can cause a knocking sound from the engine.

Noun

1. a rod that transmits motion (especially one that connects a rotating wheel to a reciprocating shaft)