Rotary joint /ˈrəʊtəri ˈdʒɔɪnt/ is a mechanical device that connects two shafts and enables them to rotate in different planes. The pronunciation of the word follows the English phonetic rules, with stress on the first syllable, and the vowel /o/ followed by the consonant /t/ representing the first syllable. The second syllable, /a/ is followed by the consonant cluster /r t/. The final syllable /i/ is pronounced with the diphthong /aɪ/, making the word "rotary joint" easy to spell and pronounce.
A rotary joint is a device commonly used in machinery and engineering applications that allows for the rotational movement of fluids, gases, or electrical signals between two or more parts of a system. It is designed to provide a reliable connection while maintaining a continuous flow or transfer of various media.
In mechanical systems, a rotary joint is typically used to transmit power or torque, enabling the rotational movement of connected parts. It consists of precision bearings or seals that allow for smooth and uninterrupted rotation while preventing leakage. These joints often find applications in rotating machinery, such as pumps, compressors, engines, or turbines.
In fluid or pneumatic systems, a rotary joint facilitates the transfer of liquids, gases, or compressed air through a rotating axis. It enables the continuous supply or circulation of these mediums without the need for disruptive rotational hoses. Rotary joints in this context are commonly used in industries like manufacturing, food processing, or chemical processing, where a controlled flow of fluids or gases is crucial.
In electrical systems, a rotary joint serves as a means to transmit electrical signals or power across rotating components, such as rotating antennas, radar systems, or wind turbines. The joint ensures a constant connection, allowing for the seamless transmission of electrical currents or signals between stationary and rotating parts.
Overall, a rotary joint is a vital component in various systems, enabling the rotational movement and continuous transfer of fluids, gases, or electrical signals while maintaining a reliable and efficient connection.
A pivot joint or trochoid.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
The etymology of the word "rotary joint" can be understood by examining the origins of the individual words involved.
1. Rotary: The term "rotary" derives from the Latin word "rota" which means "wheel" or "circle". The Latin term "rota" evolved into "rotarius" in Late Latin, which later became "rotarius" in Old French, and eventually "rotari" in Middle English. "Rotary" as an adjective was first used in English around the 18th century, describing something that revolves or rotates.
2. Joint: The term "joint" comes from Old French "joint" or "jointe", which ultimately has its roots in Latin "junctus", the past participle of "jungere" meaning "to join" or "to connect".