1. A SEMINAR REPORT
ON
UNDER THE GUIDANCE
OF:-
Prof. Kedarnath Hota
(Dep. Of Mechanical engg.)
PREPARED BY:-
ROHIT KUMAR
Mechanical-2
1201298429

2.  Need of gearless transmission.
 What is gearless transmission?
 Working
 Applications
 Comparison
 Materials
 Specification and manufacturing of parts
 Advantages
 Limitations
 Possible advances
 Conclusion

3.  Today’s world requires speed on each and
every field.
 Engineers are constantly confronted to the
challenges of efficient transmission of power.
 Gears are costly to manufacture.
 It is needed to further increase the efficiency of
transmission which cannot be done using
geared transmission
 Gearless transmission mechanism is capable of
transmitting power at any angle without using
any gears .

4.  Also called elbow mechanism.
 It is an ingenious link mechanism of slider
and kinematic chain principle.
 Transmits power at any angle without
utilising gears.

5.  Transmits the power between two shafts whose
axes are at 90 degree through bent links.
 Three links slide relatively according to the
motion given to input shaft.
 Due to this, the rotational motion of input shaft
is converted into sliding motion of links which is
then converted to rotational motion of the output
shaft.

8. Part Dimensions
Cylinder 60mm(dia.)
Shaft 15mm(dia.)
Links 10mm(dia.), 170mm (length)
Bearings 15mm (inner dia.)

9.  Tower clocks
 Gang drilling( multi spindle drilling)
 Lubrication pump for CNC lathe
 Angular drilling between 0- 90 degree
 Movement of periscope in submarines
 Used in vehicles (go-carts)
 Hand driven machines like juice makers sheet folding
machines etc.

10. GearedGearless
Manufacturing methods-
 Costly.
 manufactured on special purpose machines
 Complex calculations
 No interchangeability
Manufacturing methods-
 Less costly.
 No need of special machines
 Less calculations
 Freedom of interchangeability

11. GearedGearless
Cause of failure-
 Pitting, corrosion, erosion and fatigue have
severe effect.
 Replacement of entire gear set needs to be
done.
Cause of failure-
 Pitting, corrosion, erosion and fatigue effect
less severely
 Replacement of defected pin only

12. GearedGearless
Lubrication and cooling-
 Complex system
 Cooling is a big issue
Lubrication and cooling-
 Simple
 Easy to cool

13. GearedGearless
Torque transmitting capacity-
 Used in high torque applications
Different speed at any angle is not easily
possible
Torque transmitting capacity-
 Low torque applications
Different speed at any angle is easily done

14. • Preliminary shaping of machine
componentsPrimary shaping
• Final shape of machine
component on latheMachining process
• Polishing, lapping, filingSurface finishing
• Arc weldingJoining
• Lubrication, adjustment
Special
Operations

15.  Complete freedom of Interchangeability.
 More efficient than gear.
 Power could be transferred to any desired
angle.
 Ease of manufacturing.
 Misalignment of shafts can be tolerated to
some extent.
 Simpler cooling system
 Low cost of manufacturing.
 Portability of parts.

16.  Does not work at very low starting torque.
 Improper hole drilling could pose much problem.
 Sudden load would cause mechanism breakdown.
 Links are to be replaced after certain cycle time.
 Speed ratio is always constant 1:1.

17.  Torque bearing capacity can be improved.
 Flexible bent links can be used.
 Has a bright future in automation and robotics.
 Can be used in automobile industry in near future.