This document discusses Oldham couplings, which are used to transmit power between two parallel but non-collinear shafts. It describes how Oldham couplings work using three discs with interlocking tongues and grooves to allow for some misalignment of the shafts while preventing relative rotation. Advantages include low inertia, stiffness, ease of installation in tight spaces. Disadvantages include smaller angular misalignment range and lower torque capacity compared to other coupling types. Oldham couplings see common use in robotics, printers, and other applications requiring electrical insulation between shafts.

1. OLDHAM’s
COUPLING
Presentation by :
ALI AHMAD (FA17-BME-014)
SADAM HAIDER(FA17-BME-110)
RAHEEL UMER(FA17-BME-104)

2. WHAT IS COUPLING?
• couplings are mechanical devices used to
transmit power/torque from one shaft to another
shaft.
WHY WE NEED COUPLING?
• Power can be transmitted by means of various
gear arrangements or drives only if the shafts
are parallel.
• Couplings are used when the shafts are in a
straight line and are to be connected end to end
to transmit power.

3. TYPES OF COUPLING:
• Here are the different types of couplings
which are most widely used in industries and
machines-
•

4. HOOKE JOINT COULPING:
RZEPPA JOINT COUPLING :
OLDHAM COUPLING:
Types

5. WHAT IS OLDHAM COUPLING?
• An Oldham coupler is a method to
transfer torque between two parallel
but not collinear shafts

6. COMPONENTS:
• 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.

7. WORKING MECHANISM:
• When three disc, one disc coupled to input of shaft connect
and another disc coupled to output of torque. The Center
disc joined each other disc.
• The tongue and groove has one side is perpendicular to
other side of tongue and groove.
• Often springs are used to reduce backlash of the
mechanism.

8. Solid works Animation

9. Advantages of oldham coupling
• Low moment of inertia
• high torsional stiffness
• Easy installation in blind
• The Oldham coupling is a most expensive method of
power transmission between drive without backlash.
• Compact size of shape
• The electrical isolation through center disc are not
possible. Because it made from plastic materials.
• It act as sort of fuse in machine
• When break of first disc, the torque limit are exceed in
center disc and preventing the torque transmission.

10. Disadvantages
• It accommodates a relatively small angular
misalignment.
• It has lower peak torque and torsional stiffness.
• The driven and driving shafts do not move at
exactly the same speed in one rotation.
• There is an angular misalignment.
• It exerts an axial reactive load on support
bearings when torque reaches its maximum.

11. APLLICATION OF OLDHAM COUPLING
• It performs as a type of fuse for machinery.
• Exert a low reactive force that fortifies the support of
bearings.
• The driving and driven shafts gyrate at similar speed.
• There is no backlash and torsion inelasticity.
• It behaves as an electrical insulator.
• It can accommodate large radial misalignment.
• Comparatively, it is quite economic.
• It possesses low moment of inertia
• Robotics and servo applications
• Printer and copy machines

12. OLDHAM’s
COUPLING