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Scotch Yoke Mechanism Explained

A mechanism transforms input forces and movement into desired output forces and movement using moving components like gears, belts, and cams. A Scotch yoke mechanism converts linear motion to rotational motion using a sliding yoke with a slot that engages a pin on a rotating part, producing a sinusoidal reciprocating motion. It is commonly used in control valve actuators and old shapers. Advantages include direct conversion between rotary and reciprocating motion with easy construction and operation capable of performing multiple functions. Disadvantages are high wear from mechanical contact, limited applications, and needing guide ways for smooth reciprocation.

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41 views2 pages

Scotch Yoke Mechanism Explained

A mechanism transforms input forces and movement into desired output forces and movement using moving components like gears, belts, and cams. A Scotch yoke mechanism converts linear motion to rotational motion using a sliding yoke with a slot that engages a pin on a rotating part, producing a sinusoidal reciprocating motion. It is commonly used in control valve actuators and old shapers. Advantages include direct conversion between rotary and reciprocating motion with easy construction and operation capable of performing multiple functions. Disadvantages are high wear from mechanical contact, limited applications, and needing guide ways for smooth reciprocation.

Uploaded by

machines 416
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Mechanism

What is a mechanism?
A mechanism, in engineering, is a device that
transforms input forces and movement into a desired set of output forces
and movement. Mechanisms generally consist of moving components
that can include:
 Gears and gear trains
 Belt and chain drives
 Cam and followers
Scotch Yoke Mechanism:-
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. The location of the piston versus time is a sine
wave of constant amplitude, and constant frequency given a
constant rotational speed.
Applications:-
This setup is most commonly used in control valve
actuators in high-pressure oil and gas pipelines. Although not a
common metalworking machine nowadays, crude shapers can use
Scotch yokes. Almost all those use a Whitworth linkage, which gives
a slow speed forward cutting stroke and a faster return.
It has been used in various internal combustion
engines, such as the Bourke engine, SyTech engine, and many hot air
engines and steam engines. The term scotch yoke continues to be used
when the slot in the yoke is shorter than the diameter of the circle made
by the crank pin. For example, the side rods of a locomotive may have
scotch yokes to permit vertical motion of intermediate driving axles.
Advantages:-
1) Direct conversion of rotary motion into reciprocating motion.
2) Easy construction and operation.
3) It can perform various function such as cutting, slotting etc.
4) The process can be automated
Disadvantages:-
1) High wearing rate due to mechanical contact.
2) Less application in real life.
3) Guide ways are necessary for proper reciprocating motion of arms.

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