This seminar report discusses gearless transmission mechanisms. It begins by outlining the need for gearless transmission due to limitations of geared systems. It then describes how gearless transmission works using bent links to transmit power between shafts at any angle without gears. Applications are listed along with manufacturing details. Advantages over geared systems include lower cost, interchangeability, and ability to transmit power at varying angles. Limitations are also discussed along with potential advances.
Introduced gearless power transmission arrangement used for skew shafts. In this transmission system no. of pins or links used must be odd..3,5,7,9…..& centers of any two pins or links hole must not be on that line which represent the diameter of the shaft. If more pins or links used motion will be smoother, but increase in no. of pins or links not at the cost of strength of the shaft. Pins or links are fixed (may be permanent of temporary) in the drilled holes at the both shaft ends due to which motion is transferred. The dimensions of the pins or links and angle for the pins are all given very precisely, holes drilled very accurately.
Proposed arrangement used for skew shafts at any angle & if there is a need we can change the angle between shafts during motion or during intermittent motion with any profile of shafts having rotational motion along its own axis. The Working of this arrangement is very smooth & use very effectively with a very minimum amount of power losses.
The Geneva drive or Maltese cross is a gear mechanism that translates a continuous rotation into an intermittent rotary motion.
The rotating drive wheel has a pin that reaches into a slot of the driven wheel advancing it by one step.
The drive wheel also has a raised circular blocking disc that locks the driven wheel in position between steps.
The document give a brief idea of geneva mechanism and how it operates. this document also gives procedure to make geneva mechanism, methodology, components, design and calculations
Pneumatic Drives-Hydraulic Drives-Mechanical Drives-Electrical Drives-D.C. Servo Motors, Stepper Motors, A.C. Servo Motors-Salient Features, Applications and Comparison of all these Drives, End Effectors-Grippers-Mechanical Grippers, Pneumatic and Hydraulic- Grippers, Magnetic Grippers, Vacuum Grippers; Two Fingered and Three Fingered Grippers; Internal Grippers and External Grippers; Selection and Design Considerations.
Introduced gearless power transmission arrangement used for skew shafts. In this transmission system no. of pins or links used must be odd..3,5,7,9…..& centers of any two pins or links hole must not be on that line which represent the diameter of the shaft. If more pins or links used motion will be smoother, but increase in no. of pins or links not at the cost of strength of the shaft. Pins or links are fixed (may be permanent of temporary) in the drilled holes at the both shaft ends due to which motion is transferred. The dimensions of the pins or links and angle for the pins are all given very precisely, holes drilled very accurately.
Proposed arrangement used for skew shafts at any angle & if there is a need we can change the angle between shafts during motion or during intermittent motion with any profile of shafts having rotational motion along its own axis. The Working of this arrangement is very smooth & use very effectively with a very minimum amount of power losses.
The Geneva drive or Maltese cross is a gear mechanism that translates a continuous rotation into an intermittent rotary motion.
The rotating drive wheel has a pin that reaches into a slot of the driven wheel advancing it by one step.
The drive wheel also has a raised circular blocking disc that locks the driven wheel in position between steps.
The document give a brief idea of geneva mechanism and how it operates. this document also gives procedure to make geneva mechanism, methodology, components, design and calculations
Pneumatic Drives-Hydraulic Drives-Mechanical Drives-Electrical Drives-D.C. Servo Motors, Stepper Motors, A.C. Servo Motors-Salient Features, Applications and Comparison of all these Drives, End Effectors-Grippers-Mechanical Grippers, Pneumatic and Hydraulic- Grippers, Magnetic Grippers, Vacuum Grippers; Two Fingered and Three Fingered Grippers; Internal Grippers and External Grippers; Selection and Design Considerations.
Pedal Operated Washing Machine :-
Pedal Powered Washing Machine :-
It is type of washing machine in which the machine is operated through the pedals with the help of human power.
Fixture is a work holding and support device used in the manufacturing industry.
In this slide all the details of Fixture is given and one problem statement is also given to manufacture a Fixture.
Induction Motors Matching Permanent Magnet Performances at Lower Costsfernando nuño
Due to a continued concern on the external dependence of permanent magnets in Europe, induction technology is being pushed beyond its limits to maximise performance.
With novel materials, material characterisation and multi-domain design, power-speed capability of laminated rotor induction motors can match that typically associated with surface permanent magnet machines, at a fraction of the cost.
This session reviews the findings relating to lower cost induction motors, highlighting how they can successfully be used as an alternative to permanent magnets.
Wheel Hub Motor for Automotive Applicationsssuser0c220d
Wheel Motors were developed for the Autonomy fuel cell concept vehicle project.
Enables the low profile “skateboard” chassis by placing the traction motors in the wheels.
Allows more chassis space for Fuel Cell components.
Curved Motion System Design for Machinery and AutomationDesign World
Guided precision motion is most often thought of in the linear form which is used extensively in machinery and automation applications. Sometimes curved motion is better suited to an application. Examples might include moving a sensor or welding torch around the circumference of a pipe, or a complete 360-degree rotary table for indexing a complex assembly operation to variousangles.
Watch the webinar: http://www.designworldonline.com/curved-motion-system-design-for-machinery-and-automation/
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.
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
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.
Editor's Notes
. Due to slidingcontract, between pins and cylinders, heat generated
is more and thuseffective cooling is a must