Definition

Noun: 1. A mechanical coupling that connects two rotating shafts, allowing them to transmit power while permitting freedom of movement in various directions. This flexibility compensates for misalignment between the shafts, allowing one shaft to drive the other even when they are not in a straight line.

Usage

The term "universal joint" is used primarily in mechanical and automotive engineering contexts. It describes a specific component within a drive system. * It is a countable noun (e.g., a universal joint, two universal joints). * It often appears with verbs like have, use, replace, allow, and connect.

Examples

• The universal joint in the driveshaft was worn and needed replacement.
• A universal joint allows the transmission of rotational power at an angle.
• Many propeller shafts on boats use a universal joint to handle engine movement.

Advanced Usage

• Technical Specification: Often abbreviated as U-joint in informal technical communication (e.g., "We need to order a new U-joint for the truck").
• Function Focus: The phrase is used to explain a component's purpose: "The universal joint's function is to accommodate changes in the driveline angle."

Variants and Related Words

• U-joint (n.): A common abbreviation for "universal joint."
• Cardan joint (n.): Another name for a type of universal joint, named after the inventor Gerolamo Cardano.
• Constant-velocity joint (CV joint) (n.): A more advanced type of joint that provides constant rotational speed without the variations inherent in a simple universal joint; commonly used in front-wheel-drive vehicles.

Synonyms

• Coupling (n.): A more general term for a device that connects two shafts. (A universal joint is a specific type of flexible coupling.)
• Flexible coupling (n.): A broad category of couplings that allow for some misalignment, which includes universal joints.

Related Phrases

• To fail/wear out: Universal joints are subject to wear and can fail. (e.g., "A clicking noise when accelerating can indicate a failing universal joint.")
• Driveshaft / propeller shaft: The rotating shaft that commonly contains one or more universal joints.

Noun

1. coupling that connects two rotating shafts allowing freedom of movement in all directions
   • in motor vehicles a universal joint allows the driveshaft to move up and down as the vehicle passes over bumps