MAHARASHTRA STATE BOARD OF TECHNICAL EDUCATION,

MUMBAI
A Project Report
On:

‘ Scotch yoke Mechanism'

DIPLOMA
IN
MECHANICAL ENGINEERING
Submitted by :

 Mast. Shubham Desai

 Mast. Parth Patil
 Mast. Neeteesh Kumar

Department of Mechanical Engineering

Sant Gajanan Maharaj Rural Polytechnic, Mahagaon.

Semester – 4th
Academic year 2023-24

Under the guidance of

Mr. V.R Kori

Department of mechanical engineering, SGMRP, Mahagaon Page 1

 (MSBTE)

SANT GAJANAN MAHARAJ RURAL HOSPITAL AND RESEARCH CENTRE,

MAHAGAON
“SANT GAJANAN MAHARAJ RURAL POLITECHNIC”
A/P MAHAGAON, SITE – CHINCHEWADI, TAL – GADHINGLAJ, DIST – KOLHAPUR

CERTIFICATE
This is to certify that the following students of second year of Diploma Programmed in
Mechanical Engineering of Institute ‘SANT GAJANAN MAHARAJ RURAL POLITECHNIC
MAHAGAON – 416503 (CODE – 0965)’ has completed Micro-project on ‘ Scotch Yoke
Mechanism’ in Theory of Machine (subject code – 22438) for academic year 2023-2024 as
prescribed in the curriculum.

ROLL NO. ENROLLMENT NO. NAME OF STUDENT SIGNATURE

01 2209650311 Shubham Desai

07 2209650319 Parth Patil

30 2209650570 Neeteesh Kumar

Date of submission:

Mr. V.R. Kori Mr. V. R. Mohite Mrs. R. S. Patil

(Project Guide) (Head of Department) (Principal)

Department of mechanical engineering, SGMRP, Mahagaon Page 2

 INDEX

SR.NO TITLE PAGE NO.

01. Aim & Objective 4
02. Introduction 5
03. Components 6
04. Working Principle 7
05. Application 8
06. Conclusion 9
07. Reference 10

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 AIM:

The Scotch Yoke Mechanism is a mechanical device that

Converts rotary motion into linear motion, or vice versa. It
Consists of a slotted yoke and a pin-mounted disc. As the disc
Rotates, the pin slides within the yoke’s slot, producing a linear
Movement.
It seems like there might be a misunderstanding or a typo in your question.
The term “Scotch yoke submission” doesn’t correspond to a recognized
concept or phrase in engineering or any other field. If you have a specific
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more details or clarify, and I’ll do my best to assist you.

 OBJECTIVE:

The scotch yoke is a basic mechanism that converts rotary motion

Into reciprocating linear motion using a pin in a moving slot. An
Application for this mechanism is to open and close valves. The
Crank is connected to the slider by the pin, and as the crank turns
The pin it moves the slider.
Efficiency in Certain Applications: In specific applications, such as internal
combustion engines or pumping systems, the Scotch yoke can offer efficient
conversion of motion, contributing to the overall performance of the system.

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  INTRODUCTION:
The Scotch Yoke (also known as slotted link mechanism) is a reciprocating
motion mechanism, converting the linear motion of a slider into rotational
motion, or vice versa. The piston or other reciprocating part is directly coupled
to a sliding yoke with a slot that engages a pin on the rotating part.

An improved Scotch yoke, with a means of absorbing sideways thrust, was

patented in 1978 by William L. Carlson, Jr., U.S. Patent.
The Scotch yoke mechanism is most commonly used in control valve actuators
in high-pressure oil and gas pipelines, as well as in various internal combustion
engines, such as the Bourke engine, SyTech engine and many hot air engines
and steam engines.
The lever is longer at the ends of stroke so that a given force results in more
torque at the ends of travel than at the mid-travel positions.

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 A two- way pumping system with a scotch yoke mechanism can be utilized to
remove the excess stagnant water.

 COMPONENTS:

1. Rotary Input Source: Use a small electric motor or hand- cranked

system as the rotary input.
2. Yoke: Construct a yoke, a sliding component with a slot to accommodate the
connecting rod.
3. Connecting Rod: A rod attached to the yoke, converting the rotary motion into
linear motion.
4. Linear Guide: Ensure a smooth linear motion by incorporating bearings or
sliders.
5. Frame: Create a sturdy frame to support and house the mechanism.

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  WORKING PRINCIPLE :

The Scotch Yoke mechanism operates by transforming rotary motion into linear
motion through a sliding yoke and connected rod. Initiated by a rotary input
source, typically a crank or cam, the yoke undergoes a reciprocating motion
along a linear path. This sliding movement is transmitted to a connected rod,
resulting in a corresponding linear motion at its other end. As the rotary input
continues its rotation, the yoke returns to its initial position, completing the
cycle. The simplicity and reliability of the Scotch Yoke mechanism make it
well-suited for applications requiring controlled linear motion, including
engines, pumps, and mechanical presses.
A yoke, featuring a guiding slot, connects the slider to the crank, facilitating the
straight-line motion. As the crank rotates, the slider moves back and forth,
creating a reciprocating motion ideal for driving pistons or other components.

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 Notably, the Scotch yoke mechanism introduces a dwell period at the stroke’s
end, enhancing control over the reciprocating motion. This mechanism finds
application in engines and pumps, providing a reliable means of converting
rotational energy into useful linear motion.
The reciprocating mechanism that changes rotational motions Into reciprocating
motions or vice versa is called the Scotch Yoke Mechanism. As mentioned
above, it is an inversion of the four-bar linkage mechanism. This inversion is
obtained when one of the sliding links of a double slider-crank chain is fixed.
Thus, this mechanism is an inversion of the double slider crankshaft. Hence, it
is also known as a slotted link mechanism.
The best scotch yoke mechanism example Is control valve actuators in high-
pressure gas and oil pipelines. It is said to be more efficient than other engines,
producing more power for its weight and fewer emissions. This is attributed to
significantly fewer moving components in the scotch yoke mechanism.
According to the history of the scotch yoke mechanism, the Scotch yoke was
employed as an energy conversion tool for Russell Bourke’s two-stroke Bourke
engine at the start of the 20th century.
The crank has completed the revolution of the clock at the same time as yoke
sliding completely moved forward. When this position takes longer to initiate
the return stork, after spending time, the crank will be rotated continuously to
return to its initial state of rotation. Therefore the yoke moves in a backward
direction and returns to the starting position.

 APPLICATION:

Reciprocating Engines: Scotch yoke mechanisms are employed in

reciprocating engines, where the linear motion generated is crucial for the
functioning of pistons. This application is common in internal combustion
engines and certain types of steam engines.

Pumping Systems: In hydraulic or pneumatic pumping systems, Scotch yoke

mechanisms can be utilized to create reciprocating motion for the pump,
facilitating the movement of fluids.

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 Presses and Stamping Machines: The mechanism is employed in mechanical
presses and stamping machines, where controlled linear motion is required for
shaping or cutting materials.

Industrial Automation: In various industrial automation processes, Scotch

yoke mechanisms can be integrated into machinery for tasks requiring back-
and-forth linear motion.

Educational Demonstrations: Scotch yoke mechanisms are often used in

educational settings to demonstrate the principles of motion conversion. They
provide a clear and simple way to showcase how rotational motion can be
transformed into linear motion.

Simulation and Testing Equipment: The Scotch yoke mechanism is used in

testing equipment to simulate linear motions for various applications, such as
evaluating the durability of components or testing the performance of materials.

Manufacturing Machinery: Scotch yoke mechanisms are utilized in

manufacturing processes where linear motion is required. For instance, in
shaping machines or presses, they help in converting rotary motion from a
motor into precise linear movement for cutting or forming materials.

Internal Combustion Engines: Scotch yoke mechanisms are employed in

some internal combustion engines to translate the rotary motion of the
crankshaft into the linear motion necessary for piston movement, enabling the
intake, compression, power, and exhaust strokes in an engine cycle.

 CONCLUSION:

The Scotch Yoke Mechanism is a mechanical device that converts rotary

motion into linear motion, or vice versa. It consists of a slotted yoke and a pin-
mounted disc. As the disc rotates, the pin slides within the yoke’s slot,
producing a linear movement.
The Scotch Yoke mechanism stands as a robust and versatile solution for
converting rotary motion into linear motion in various engineering applications.
Its simplicity, reliability, and effectiveness have led to its widespread use in

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 reciprocating engines, pumping systems, presses, valve control mechanisms,
automotive applications, and industrial automation.
In conclusion, the Scotch yoke mechanism is a versatile and widely used
mechanical component that plays a crucial role in various engineering
applications. Its primary function is to convert rotary motion into linear motion,
making it essential in processes ranging from internal combustion engines to
manufacturing machinery. The simplicity, reliability, and effectiveness of the
Scotch yoke mechanism contribute to its continued relevance in different
industries, where precise reciprocating motion is required. Whether in
automotive engineering, manufacturing, or educational demonstrations, the
Scotch yoke mechanism remains a fundamental element in the world of
mechanical systems.
A mechanism Is a combination of number of bodies assembled in such a way
that the motion of one causes constrained and predictable motion to the other.
Mechanisms are used to convert the given motions into useful mechanical
motions. Mechanisms transmit or transform motion

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  REFERENCE:

 https://chat.openai.com/c/e14559cf-ea37-4aec-9ec5-0984081f1a5d

 https://testbook.com/amp/mechanical-engineering/scotch-yoke-
mechanism-application

 https://mechdiploma.com/q20-explain-sketch-scotch-yoke-mechanism

 https://mechanicaljungle.com/construction-of-scotch-yoke-mechanism/

 https://medium.com/@om.vartak21/scotch-yoke-mechanism-
aa17aaf35639

 https://www.researchgate.net/figure/Fig-1-Scotch-Yoke-Mechanism-32-
Working-Principles-Hacksaw-Machine-using-Scotch-
yoke_fig1_327200881

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