A coupling is a device used to connect two shafts together for the purpose of transmitting power. Two types of couplings ◦ Rigid ◦ Flexible also known as compensating
Couplings interact with other devices by joining two shafts together in order to transmit power from one shaft to another shaft.
Rigid couplings are used when precise shaft alignment is required; shaft misalignment will affect the couplings performance as well as its life.
Friction coupling ◦ Clutch Fluid coupling ◦ Torque converter Hirth joint ◦ High power gas turbines Flanged ◦ Pipe
•Clutches are a friction based rigidcoupling that transmits power by joiningtwo shafts using a friction plate.•Clutches are located on manualcars, automatic cars, ships, and otherindustrial applications. Pros Cons •Inexpensive •Require maintenance and •No fluid/ lubricant required friction plate is consumed •Can be disengaged while in over time motion
•A torque converter in a fluid based rigidcoupling used to transmit power from oneshaft to another shaft via a fluid median.As the input shaft spins it rotates a turbinecausing fluid to move and turn the turbineon the output shaft.•Torque converts are commonly found inautomatic cars, hydraulic motors, andturbines. Pros Cons •Last a long time •Require fluid •Can dynamically changed •Expensive the relative motion between the input and output shaft
•Hirth joints are a type of rigid coupling that transmits power by using two shafts that have interlocking teeth. •Hirth joints are commonly found on high speed high torque industrial machinery that benefits from the hirth joints self centering capabilities. Common applications include gas turbines, turboprops, steam generators. Pros Cons•Self centering •Require lubricant•Transmit large amounts of •Expensivepower•Can be disengaged while inmotion
•Flanged couplings are a type of rigid coupling that utilizes flanges and bolts to couple to shafts together. •Common applications of flanged couplings is joining two pipes together in order to transmit water pressure, it can also be used to extend a rotating shaft. Pros Cons•Cheap •Can not be•Simple disengaged while in•Effective motion•No maintenance orreplacing lubricantrequired.
Flexible couplings are designed to transmit torque while permitting some radial, axial, and angular misalignment. Flexible couplings can accommodate angular misalignment up to a few degrees and some parallel misalignment.
Universal joint ◦ Drive shaft on cars Cardan joint ◦ Train cars Ball joints ◦ Car steering assembly Thompson couplings ◦ High torque industrial drive shafts
•Universal joints are a type of flexible coupling that utilized a yoke and cross to connect two shafts and allow shafts to be at an angle relative to each other. •Common application of Universal joints include car drive shafts, steering columns. Pros Cons•Inexpensive •Wears out over time
•Cardan joints are a type of flexible coupling that connects two shafts using two pivots and a connecting rod. •Couplings are often used for steering column and ratchet extensions. Pros Cons•Inexpensive •Can not transfer high torque or high speed loads
•Thompson coupling is a flexible coupling that utilizes a configuration of two cardan joint assemblies, and a modified universal joint •Common application include high power generators, trailer hitches, and gas turbines. Pros Cons•Very strong, can •Require lubricationtransmit large amounts •Very expensiveof torque•Reduce almost allfriction, and stress onthe coupling•Very efficient
Ball joint is a flexible coupling that uses a spherical ball and socket like configuration in order to allow a shaft to pivot while pivoting. Common applications include car axle assemblies, the human hip joints, throttle bodies, and gas springs. Pros Cons•Inexpensive •Require and consume•Provides 3 axes of rotation lubricants
Kilchermann, Lori. "What Is a Shaft Coupling?" WiseGEEK: Clear Answers for Common Questions. 13 May 2006. Web. 10 Feb. 2011. <http://www.wisegeek.com/what-is-a-shaft- coupling.htm>. Khemani, Haresh. "What Is Coupling? Types of Shaft Couplings." Find Health, Education, Science & Technology Articles, Reviews, How-To and Tech Tips At Bright Hub - Apply To Be A Writer Today! 8 Nov. 2009. Web. 10 Feb. 2011. <http://www.brighthub.com/engineering/mechanical/articles/4 3237.aspx>. Mecha, Roy. "Drive Couplings." Engineering Examples. 28 Oct. 2003. Web. 10 Feb. 2011. Nice, Karim. "How Torque Converters Work" 25 October 2000. HowStuffWorks.com. <http://auto.howstuffworks.com/auto-parts/towing/towing- capacity/information/torque-converter.htm> 10 February 2011.
A particular slide catching your eye?
Clipping is a handy way to collect important slides you want to go back to later.