for engineering student

1. ELEMENTS OF MECHANICAL
ENGINEERING

2. Prepared by:-
Nikul pithva(m-36)
Shilay nilesh(m-37)
Guided by:-
Ravi sir
Flexible coupling and flange
coupling

3. COUPLING
Shaft are mostly available upto 7 metres
length due to transport difficulty.
To get a greater length , it is necessary to joint
two or more pieces of the shaft using coupling.

4. FLANGE COUPLING
This coupling is having two separate cast iron
flanges as shown in fig. A unprotected type
flange coupling .
Each flange is mounted on the shaft end and
keyed to it.
The two flanges are coupled together by help of
bolts and nuts.
The projected portion of one of the flange and
corresponding recess on other flange are help to
bring the shafts into line and to maintain
alignment.

5. FIG. FLANGE COUUPLING

6. A FLANGE IS PROVIDED WITH A SHROUD WHICH SHELTERS
THE BOLT HEADS AND NUTS AS SHOWN IN FIG. IS CALLED
PROTECTED FLANGE COUPLING.
THIS COUPLING PREVENT CATCHING CLOTHES OF WORKMAN.
Fig. Protected type flange coupling

7. This flange couplings is most accurate and
rigid.
This coupling provide the strong connection of
shafts.
It is used for heavy power transmission at low
speed.

8. FLEXIBLE COUPLING
This coupling is used to protect the driving and
driven machine members against harmful effects
produce due to misalignment of shafts, vibration,
sudden shock load or shaft expansion.

9. There are basic three types of flexible
coupling as follows:
1) Bushed pin type flange coupling :
 this type of coupling allows for imperfect
alignment of two joining shafts.
2) Oldham coupling:
 This type of coupling is used to join two
parllel shafts with small offset.
3) Universal coupling:
 This type of coupling is used to join two
intersecting shaft.

10. 1) BUSH PIN TYPE FLANGE COUPLING
Fig. Bush pin type flexible coupling

11. this is modified form of protected type flange
coupling.
This type of coupling has a pins and it work as a
coupling bolts. the rubber or leather bushes are used
over the pins.
The coupling is having two halves are dissimilar in
construction as shown in fig.
The pins are rigidly fastened by nuts to one of the
flange and kept loose in the other flange.

12. This coupling is used for connection of shafts
which having the small parallel misalignment,
angular misalignment and axial displacement.
In this coupling rubber bush absorbs shocks
and vibration during its operation.
This type of coupling is mostly used to couple
an electric motor and machine.

13. 2) OLDHAM’S COUPLING:
Fig. Oldham’s coupling

14.  It consists of two flange A and B with slots and a
central floating disc E as shown in fig.
The disc E having tongues T1 and T2 at right
angles. the tongue T1 is fitted into the slot of flange
A and allows horizontal sliding relative motion while
the tongue T2 is fitted into the slot of the flange B
and allows for vertical sliding relative motion.
This right angle motions of tongues on the slots
will accommodate lateral misalignment of shaft when
they rotate.
Oldham’s coupling is used in connecting two
parallel shafts but not in alignment, and their axis are
at small distance apart.

15. 3) UNIVERSAL COUPLING:

16. These two forks are assembled to a central
block by pin.
A central block having two arms at right angle to
each other.
Universal coupling is used to connect two shafts
whose axis intersect.
It also used to connect two shafts, where the
angle between two shafts may be varied when
they rotate.
The universal coupling is widely used in
automobile and machine tools.