This document provides an overview of gears and gear trains. It defines gears as toothed wheels that transmit motion between two shafts, and gear trains as combinations of two or more meshing gears. The document then discusses the types of gears based on axis position and peripheral velocity, as well as the materials and manufacturing processes used to make gears. Finally, applications of gear trains are described, including their use in differentials to allow wheels to rotate at different speeds.
The worm gears are widely used for transmitting power at high velocity ratios between non-intersecting shafts that are generally, but not necessarily, at right angles.
It can give velocity ratios as high as 300 : 1 or more in a single step in a minimum of space, but it has a lower efficiency.
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The worm gears are widely used for transmitting power at high velocity ratios between non-intersecting shafts that are generally, but not necessarily, at right angles.
It can give velocity ratios as high as 300 : 1 or more in a single step in a minimum of space, but it has a lower efficiency.
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PRESENTATION ON WORM GEAR FOR DESIGN OF MACHINE ELEMENT 2 BY :
Ranjan Rajkumar, Ranjan Leishangthem and Daihrii Kholi
of mechanical engineering Department, NATIONAL INSTITUTE OF TECHNOLOGY MANIPUR
Cam and follower theory prof. sagar a dhotareSagar Dhotare
This ppt covers following points,
Classification of Cam and Follower
Terminology of cam
Importance of Pressure angle
Application of Cam and Follower
Importance of cam and follower
This is the basic lecture on introduction to gears for engineering students. It includes basics of gears, spur gear, bevel gear, etc. It also talks about a fundamental law of gearing, pressure angle and contact ratio.
Unit 1-introduction to Mechanisms, Kinematics of machines of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
PRESENTATION ON WORM GEAR FOR DESIGN OF MACHINE ELEMENT 2 BY :
Ranjan Rajkumar, Ranjan Leishangthem and Daihrii Kholi
of mechanical engineering Department, NATIONAL INSTITUTE OF TECHNOLOGY MANIPUR
Cam and follower theory prof. sagar a dhotareSagar Dhotare
This ppt covers following points,
Classification of Cam and Follower
Terminology of cam
Importance of Pressure angle
Application of Cam and Follower
Importance of cam and follower
This is the basic lecture on introduction to gears for engineering students. It includes basics of gears, spur gear, bevel gear, etc. It also talks about a fundamental law of gearing, pressure angle and contact ratio.
THEORY OF MACHINES FOR VTU, AMIE, DME STUDENTS..
The study of a mechanism involves its analysis as well as synthesis.
Analysis is the study of motions and forces concerning different parts
of an existing mechanism. Whereas Synthesis involves the design of its
different parts.
Mechanics: It is that branch of scientific analysis which deals with
motion, time and force.
Kinematics is the study of motion, without considering the forces
which produce that motion. Kinematics of machines deals with the
study of the relative motion of machine parts. It involves the study of
position, displacement, velocity and acceleration of machine parts.
Dynamics of machines involves the study of forces acting on the
machine parts and the motions resulting from these forces.
Plane motion: A body has plane motion, if all its points move in
planes which are parallel to some reference plane. A body with plane
motion will have only three degrees of freedom. i.e., linear along two
axes parallel to the reference plane and rotational/angular about the
axis perpendicular to the reference plane. (eg. linear along X and Z
and rotational about Y.)The reference plane is called plane of motion.
Plane motion can be of three types. 1) Translation 2) rotation and 3)
combination of translation and rotation.
Translation: A body has translation if it moves so that all straight
lines in the body move to parallel positions. Rectilinear translation is a
motion wherein all points of the body move in straight lie paths.
Eg. The slider in slider crank mechanism has rectilinear translation.
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Law of toothed gearing – Involutes and cycloidal tooth profiles –Spur Gear terminology and
definitions –Gear tooth action – contact ratio – Interference and undercutting. Helical, Bevel, Worm, Rack and Pinion gears
Discussion Map
Gears are toothed, cylindrical wheels used for transmitting motion and power from one rotating shaft to another.
Most gear drives cause a change in the speed of the output gear relative to the input gear.
Some of the most common types of gears are spur gears, helical gears, bevel gears, and worm/worm gear sets.
The following presentation includes information on gears, application of gears, gear trains, velocity ratio, and few simple solved examples based on the above stated topics
GEARS AND GEAR TRAINS
Gear – Types – Spur gear terminology – Law of toothed gearing – Basics of Involute and Cycloidal Tooth Forms, Interchangeability – Interference and Undercutting – Gear trains Calculations – Speed and Number of teeth – Simple, Compound and Epicyclic gear trains.
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This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
1. GEAR
&
GEAR TRAINS
See the background of slide....!!!
For pre-info about journey we are about
to begin…….
2. LETS START WITH OUR
JOURNEY….
INTRODUCTION TO
GEARS AND GEAR
TRAINS
START
TYPES OF
GEARS
MANUFACTURING
GEAR TRAINS
APPLICATIONS
END
3. WHAT ARE GEARS???
• A friction wheel with teeth cut on it,
i.e. ; a synchronous arrangement of
projections and recesses on a wheel.
projections
recess
5. + and – ‘s of GEAR
TRAINS
Over belts , ropes and chain drives.
+
Transmits exact VELOCITY RATIO*
Compact layout and higher EFFICIENCY.
_
Making of Gears require special tools and
equipments.
Noise and vibrations are produced during
their usage.
* This is the true principle of gearing
6. Velocity Ratio
Ratio of the distance moved by the EFFORT
POINT and LOAD POINT.
2
1
1
2
1
2
d
d
N
N
RATIO
7. VARIOUS TYPES OF
GEARS
• PARALLEL
• INTERSECTING
• NON-INTERSECTING AND NON-
PARRALEL
POSITION OF
AXES OF
SHAFTS
• LOW VELOCITY.
• MEDIUM VELOCITY.
• HIGH VELOCITY.
PERIPHERAL
VELOCITY OF
GEARS
• EXTERNAL GEARING.
• INTERNAL GEARING
• RACK AND PINION.
TYPE OF
GEARING
BASIS
12. MANUFACTURING
MATERIALS FOR GEARS
TYPE OF MATERIAL USED DEPENDS ON:
• STRENGTH
• SERVICE CONDITIONS LIKE NOISE,WEAR,etc.
GEARS ARE MANUFACTURED BY:
(commercially available)
• METALLIC: CAST IRON,BRONZE AND STEEL.
• NON-METALLIC: WOOD,SYNTHETIC RESINS like
NYLON, especially used to reduce NOISE.
13. METALLIC GEARS are
basically used for rough
mechanical purposes
METAL
USED
SPECIFICATIONS
CAST IRON
(employed
where smooth
action is not
that
important )
GOOD WEARING
PROPERTIES,EXCELLENT
MACHINABILITY AND EASE
OF PRODUCING COMPLEX
SHAPES USING CASTING
PROCESSES.
steel Used where high strength
gears are required and
usually heat treated to
provide toughness and tooth
strength.
Phosphor
bronze
Used in worm gears to
reduce wear which will be
max. with cast iron.
14. MORE ON
MANUFACTURING
SOME TERMS ARE REQUIRED TO BE CONSIDERED WHEN WE
DESIGN GEARS such as:
MODULE: THIS IS THE RATIO OF PITCH CIRCLE DIAMETER (in
mm) TO THE NO. OF TEETH
m=(pitch circle diameter(in mm))/(No. of teeth)=D/T.
RECOMMENDED SERIES OF MODULES IN INDIAN STANDARDS
ARE 0.5,1,1.5,2,2.5,3,4,5,6,8,10,12,16,20.
CIRCULAR PITCH: IT IS THE DISTANCE BETWEEN A POINT ON
ONE TOOTH TO THE CORRESPONDING POINT ON NEXT TOOTH.
PITCH= ∏D/T.
REMEMBER: A LITTLE CONSIDERATION SHOWS THAT FOR
GEARS TO MESH PROPERLY,IT IS NECESSARY THAT THEIR
CIRCULAR PITCH IS SAME.
15. Resuming sree’s talk on
GEAR TRAINS
• A gear train is two or more gear working
together by meshing their teeth and
turning each other in a system to
generate power and speed
• It reduces speed and increases torque
• Electric motors are used with the gear
systems to reduce the speed and
increase the torque
16. Types of Gear Trains
• Simple gear train
• Compound gear train
• Planetary gear train
Simple Gear Train
• The most common of the gear train is the
gear pair connecting parallel shafts. The
teeth of this type can be spur, helical or
herringbone.
• Only one gear may rotate about a single axis
20. Planetary Gear Train…
• In this train, the blue gear has six times the
diameter of the yellow gear
• The size of the red gear is not important because
it is just there to reverse the direction of
rotation
• In this gear system, the yellow gear (the sun)
engages all three red gears (the planets)
simultaneously
• All three are attached to a plate (the planet
carrier), and they engage the inside of the blue
gear (the ring) instead of the outside.
21. Planetary Gear Train…
• Because there are three red gears
instead of one, this gear train is
extremely rugged.
• Planetary gear sets can produce different
gear ratios depending on which gear you
use as the input, which gear you use as
the output, and which one you hold still.
22. Planetary Gear Train…
• They have higher gear ratios.
• They are popular for automatic
transmissions in automobiles.
• They are also used in bicycles for
controlling power of pedaling
automatically or manually.
• They are also used for power train
between internal combustion engine and
an electric motor
23. APPLICATIONS
DIFFERENTIAL DRIVER: A MIRACULOUS MECHANISM
STARTING FROM A BASIC ASSEMBLY USING GEAR
TRAINS
A vehicle's wheels rotate at different speeds,
especially when turning corners. The differential is
designed to drive a pair
of wheels with equal force, while allowing them to
rotate at different speeds
24. Input torque is applied to the ring gear (blue),
which turns the entire carrier (blue), providing
torque to both side gears (red and yellow), which
in turn may drive the left and right wheels. If the
resistance at both wheels is equal, the planet
gear (green) does not rotate, and both wheels
turn at the same rate.
25. If the left side gear (red) encounters resistance,
the planet gear (green) rotates about the left
side gear,
in turn applying extra rotation to the right side
gear
(yellow).
26. BIBLIOGRAPHY
• “THEORY OF MACHINES” by
PROF. KHURMI,R.S.
• ARTICLES FROM
WIKIPEDIA:”GEARS”.CITED ON
5/4/2011.
• “THEORY OF MACHINES”,by
SHINGLEY,JOSEPH
EDWARD;JOHN UICKER.