What is Gearless Mechanism?
Gearless mechanism is an link mechanism of slider and pair, which is also known as El-bow mechanism
The component is exceptionally valuable for cornering or transmitting movements at right points.
However in certain mechanical application Gearless Transmission at Right Angle can likewise work at
insensitive or exact edge plane can be contrasted with worm and worm rigging or slant and pinion gear which
are constantly utilized as a part of the business for various application. Similarly high proficiency between the
info and the yield power shafts as to the rigging efficiencies.
Construction
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It consist of links or rods that are bend exactly at 90 degree (right angle).
The number of links required would be 3 to 8.
The more the links, the smoother will be the operation.
Links are made up of bright bars as the bright bar material has good surface finish.
These links slides inside the through and through drilled cylinder.
Thus forming a sliding pair.
These cylinders are coupled to the input and output shaft with help of key.
Power is supplied by electric motor.
ADVANTAGES
 1. High Efficiency between input and output power shafts.
 2. This coupling enables a variable parallel offset between two shafts. They provide constant
speed velocity with extremely low backlash, and their compact designs provide large floor space
savings.
 3. Easy manufacturing of links and links in comparison of crossed helical and worm gear.
 4. Very little friction.
 5. Hunting and backlash is absent.
 6. Backlash-free shaft securement and torque transmission .
 7. This is a very smooth-acting device, and the power loss is minimum.
 8. It can be run at nearly any speed, even at high speed and is very quiet.
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APPLICATIONS
1. Driving for all kinds four faced tower clocks. The elbow mechanism was first use in the year 1685 for
the famous London tower clock named bigben.
2. The mechanism is invariable used for multiple spindle drilling operation called the gang drilling.
3. Used for angular drilling between 0 to 90 degree position.
4. Lubrication pump for C.N.C. lathe machines.
5. The mechanism is very useful for a reaching a drive at a clumsy location.
6. Air blower for electronic and computer machine.
7. The mechanism has found a very usefully use in electronic and computer technology for multiple.
8. The elbow mechanism is used for movement of periscope in submarines, the year 1685 for the famous
London tower clock.
INTRODUCTION
Today’s world requires speed on each and every field. Hence rapidness and quick working is the
most important. Now a days for achieving rapidness, various machines and equipment’s are
manufactured by man. Engineer is constantly conformed to the challenges of bringing ideas and
design in to reality.
New machine and techniques are being developed continuously to manufacture various
products at cheaper rates and high quality. The project “GEARLESS TRANSMISSION” being
compact and portable equipment, which is skillful and is having something practice in the
transmitting power at right angle without any gears being manufactured. This project gives us
knowledge, experience, skill and new ideas of the manufacturing. It is a working project and
having guarantee of the success. El-bow mechanism is an ingenious link mechanism of slider
and kinematic chain principle. This is also called as “gearless transmission mechanism” this
mechanism is very useful for transmitting motion at right angles. However in certain industrial
application “gearless transmission at right angle” can also work at obtuse or accurate angle
plane can be compared to worm and worm gear or bevel and pinion gear which are invariably
used in the industry for numerous application. The main feature for mechanism comparatively
high efficiency between the input and the output power shafts with regards to the gear
efficiencies.
1. INTRODUCTION The gear drives are extensively used for accurate and variable power transmission in
various sectors like Automobile, Aerospace, Marine and Defence, Industrial cutting and machine tools,
Lifting and hoisting devices, etc. The main drawback of gear drive is less efficient due to errors like
backlash, resulting in the vibrations during operations and decrement in product life due to more wear
rate of components [1]. Selby,1917 developed an innovative gearless mechanism in which speed was
varied by forwarding and backward movement by applied shaft-hub assembly [2]. Johnson,1966
established the apparatus especially for automobile and aerospace industries in which the power was
transferred in terms of increasing or decreasing speed through rotating frictionless balls [3]. Chakradhar,
et al., 2019 showed advantages like less floor space area, simple working, lower friction and smooth
operation, interchangeability of components, reduction in production cost, etc. of gearless mechanisms
over gear equipped mechanisms [4]. Wu & Dong, 2014 analyzed the gearless reducer mechanism by
introducing frictionless balls for unilateral and bilateral transmission. The trial experiments for both
types of transmission revealed smooth operations and effective working efficiency [5]. Pramesh, et al.,
2017 performed design and analysis of gearless elbow mechanism in Ansys software by a varying
number of pins. It was proved from a simulation that the deformation and developed stress values were
raised with an increasing number of pins [6]. The greater number of pins will be increasing the friction
loss and weight of setup which results in power transmitting efficiency. Pawar, et al., 2018 designed a
gearless elbow mechanism with three pins situated at 120° each for right angle (90°) power transmission
[7].