1. GEARLESS
POWER TRANSMISSION
SYSTEM
BY:
Dolat Ram
DEPARTMENT OF MECHANICAL
ENGINEERING, JAMSHORO

2. OVERVIEW
 Need of gearless transmission?
 What is gearless transmission.
 Working principle
 Construction Details
 Applications
 Comparison
 Materials
 Specification and manufacturing of parts
 Advantages
 Limitations
 Possible advances/ Future aspects
 Conclusion

3. Need Of Gearless Transmission
 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 can not be done using geared
transmission.
 Gearless transmission mechanism is capable of
transmitting power at any angle without any gears being
manufactured.

4. What is Gearless Transmission?
 Also called elbow mechanism.
 It is an ingenious link mechanism of slider and kinematic
chain principle.
 Transmits power at any angle without utilizing gears.

5. Working Principle
 Transmits the power between two shafts whose axes are
at 90◦ degrees 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.

6. General Layout:

7. Construction Details:
Part
Cylinder
Shaft
Links
Bearings
Dimensions
165mm
(dia.)
25mm
(dia.)
12mm
(dia.)
25mm
(inside
dia.)

8. Applications
 Tower clocks
 Gang drilling (multi spindle drilling)
 Lubrication pump for CNC lathe
 Angular drilling between 0-90 degrees
 Movement of periscope in submarines
 Used in vehicles (go-carts)
 Hand driven machines like juice makers, sheet machines
etc.
 Small and medium load transmission
 Very useful in machine shop
 Industrial application

9. Geared v/s Gearless Transmission
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

10. Geared v/s Gearless Transmission
Causes of failure:
 Pitting, corrosion, erosion
and fatigue have severe
effect.
 Replacement of entire gear
set needs to be done.
Causes of failure:
 Pitting, corrosion, erosion
and fatigue effect less
severely.
 Replacement of defected
pin only.

11. Geared v/s Gearless Transmission
Lubrication and cooling:
 Complex system
 Cooling is big issue
Lubrication and cooling:
 Simple
 Easy to cool

12. Geared v/s Gearless Transmission
Torque transmitting
capacity:
 Used in high torque
applications
 Different speed at any
angle is not easily possible
Torque transmitting
capacity:
 Used in low torque
applications
 Different speed at any
angle is easily done

13. Manufacturing of parts
Primary Shaping
(Shaping of machine
components)
Machining process
(Final shape of
machine components
on lathe)
Surface finishing
(Polishing, lapping,
filing)
Joining (Arc welding)
Special operation
(Lubrication,
adjustment)

14. Advantages
 More efficient than gear.
 Complete freedom of interchangeability.
 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.
 Used to reduce maintenance of cost
 Quick response is achieved.
 Easy to maintain and repair.

15. Advantages
 No fire hazard problem due to over loading.
 The speed of forward and reverse stroke is varied.
 Continuous operation is possible without stopping.

16. Limitations
 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
 Load carrying capacity of this unit is not very low.

17. Future Aspects
 Torque bearing capacity can be improved.
 Flexible bent links may be used.
 Has a bright future in automation and robotics.
 Can be used in automobile industry.
Note: By attaching bushes with drum then the chances
of vibration may reduce and also overall weight of the
mechanism is also reduced(by using drum with less
thickness). The proper operation of bent links may
obtained.

18. Conclusion
 The model works correctly as per the design.
 With the help of this system, we can efficiently reduce
the cost in power transmission and at the same time
reduce the maintenance cost of the same machine.
 Further advancement in this technology can be made.

19. THANKYOU