Oldham’s coupling

1. OLDHAM’s COUPLING A Presentation by : Akash Sood 0939ME101002 SUBMITTED TO :

2. Contents History Defining Derivatives Placing External Mounts Working Advantages / Dis-advantages Application OLDHAM’s COUPLING A Presentation by : Akash Sood

3. History The coupler is named for John Oldham who invented it in Ireland, in 1820, to solve a paddle placement problem in a steamship design . OLDHAM’s COUPLING A Presentation by : Akash Sood

4. Defining An Oldham coupler is a method to transfer torque between two parallel but not collinear shafts . OLDHAM’s COUPLING A Presentation by : Akash Sood

5. Derivatives It has three discs, one coupled to the input, one coupled to the output, and a middle disc that is joined to the first two by tongue and groove . OLDHAM’s COUPLING A Presentation by : Akash Sood

6. Placing The tongue and groove on one side is perpendicular to the tongue and groove on the other . OLDHAM’s COUPLING A Presentation by : Akash Sood

7. External Mounts Often springs are used to reduce backlash of the mechanism . OLDHAM’s COUPLING A Presentation by : Akash Sood

8. Working OLDHAM’s COUPLING A Presentation by : Akash Sood

9. Working OLDHAM’s COUPLING A Presentation by : Akash Sood

10. Advantages Protects driven component by serving as a mechanical "fuse" - an inexpensive replaceable plastic midsection shears under excess load. Protects support bearings by exerting consistently low reactive forces, even under large misalignments. Electrical insulation Accommodates large radial misalignment in a short length Accommodates much larger angular misalignment then standard Oldham coupling Easy installation in blind or difficult installations when through-bores are used Economically priced compared to other couplings with similar performance characteristics Inexpensive replaceable wear element Low moment of inertia OLDHAM’s COUPLING A Presentation by : Akash Sood

11. Dis-advantages Lower peak torque and torsional stiffness than standard Oldham coupling Slightly non- homokinetic transmission (that is, the driven and driving shafts don't move at exactly the same speed throughout one rotation) when angular misalignment is significant Axial reactive loads exerted on support bearings when torque approaches maximum Accommodates only a small axial misalignment OLDHAM’s COUPLING A Presentation by : Akash Sood

12. Application It was basically invented to connect two parallel non co axial shafts. It is a really good mechanism and transmits the same speed and same direction of rotation. It is not of much importance now as gears are being used. OLDHAM’s COUPLING A Presentation by : Akash Sood

13. OLDHAM’s COUPLING Thank you !  A Presentation by : Akash Sood