We were discussing the basic concept
of spring in strength of material, various
definitions and terminology used in springs, Â importance of
spring index and expression
for maximum bending stress and deflection developed in the plate of leaf spring in our previous posts.
Today, we will find out here the basic difference
between open coiled and closed coiled helical spring with the help of this post.
Helical springs are usually used in number of
applications due to their shock absorption and load bearing properties. We will
see here two types of helical spring i.e. Open coiled helical spring and closed
coiled helical spring.
Open coiled helical spring
Open coiled helical springs are also termed as
compression springs as such springs are designed to resist the compressive
load. In simple, we can say that open coiled helical springs are those springs
which are used in such applications, where compressive loads are present.
In case of open coiled helical spring, spring wires
are not wound tightly. Hence such springs will have high pitch. There will be
large space between two consecutive wires of open coiled helical springs and hence,
no two turns of a open coiled helical spring will lie in same plane.
In case of open coiled helical spring, turns or
coils of such spring will be located at inclined angle towards the helical
axis.
In case of open coiled helical spring, helix angle
will be more than 100.
Example of open coiled helical spring
Valve assemblies in engines
Feeder mechanism
Ball point pen
Closed coiled helical spring
Closed coiled helical springs are also termed as tension
springs as such springs are designed to resist the tensile load and twisting
load. In simple, we can say that closed coiled helical springs are those
springs which are used in such applications, where tensile or twisting loads
are present.
In case of closed coiled helical spring, spring
wires are wound tightly. Hence such springs will have very small pitch. Closed
coiled helical spring wires are very close to each other and hence, spring turns
or coils will lie in same plane.
In case of closed coiled helical spring, turns or
coils of such spring will be located at right angle to the helical axis.
In case of closed coiled helical spring, helix angle
will be less than 100.
Example of closed coiled helical spring
Garage door assemblies
Carburetors
Vise-grip pliers
Do you have suggestions? Please write in comment box.
We will now discuss another topic, in the category
of strength of material, in our next post.
Reference:
Strength of material, By R. K. Bansal
Image Courtesy: Google
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