SHORT QUESTION ANSWERS
-SPRINGS CLASS NOTES FOR
Spring is an important part
in almost every machinery.
These springs perform different
functions in different applications.
These absorb shocks in vehicles
running on uneven roads. These
store energy in toys and circuit
breakers. These give cushion
effect in sofas and cars. Springs
are of different types namely
close and open coiled helical
springs, laminated and spiral
springs. Question answers on
springs will increase
understanding and clarity
about the springs.
Q. What is the function of a spring?
The spring is to absorb shock. When a vehicle moves on an UNEVEN road, a jerk or shock produces. All vehicles use springs to absorb this jerk in the form of strain energy. Hence jerk does not pass to the passengers.
Q. List the various types of springs.
(I) Close – coiled helical springs (wire springs)
(ii) Open-coiled helical spring (wire springs)
(iii) Plate springs (laminated springs)
(iv) Strip springs (spiral springs).
Q. Describe close coiled springs. Where does close coiled helical springs used?
The wire springs in which the various turns of the springs touch each other. Spring balances and pressure gauges use these spring.
Q. Explain open coiled springs? Where does open coiled helical springs used?
The wire springs in which the various turns of the spring are at distance from each other. Shock absorbers use these springs.
Q. Discuss plate springs (Laminated springs or Leaf Spring or Carriage Springs) ? Where does plate springs used?
Laminated springs have number of plates kept over one another. There are one or two lower plates are of full length. There use truncated laminations. These are shorter than full length. Such springs are Leaf Springs. Various vehicles use these springs.
6. What are strip springs (Spiral Springs) ? Where does strip springs used?
It forms a spiral and made from a thin sheet. Watches and toys use these springs.
7. What is difference between close and open coiled helical spring?
Close coiled helical springs
The wire of this spring is in tension and hence also called a tension spring. In this case, the torsional shear stress is extremely high. Distance between various coils is very small or pitch is very small. Coil of the spring becomes perpendicular to the axis of the spring. Carburetors and vice grip pliers use these springs.
(i) Design these for torsion under axial load.
(ii) Under axial couple, design these for bending.
Open Coiled Helical Springs
This spring is free initially. When load applies, it comes in compression. Therefore, it is also a compression spring. In this case, Pitch of open coiled helical spring is much greater than that of close coiled springs. Therefore the plane of the turns is not perpendicular to the axis of the spring. Turns incline to horizontal at helix angle ‘α’. Car seats use Open coiled springs. Car suspension system cell phones and many electronics devices use these springs,
Under axial load and axial couple, bending and shear stresses both exist. design such springs under maximum principal stress.
https://www.mesubjects.net/wp-admin/post.php?post=7618&action=edit Close coiled under axial force
https://www.mesubjects.net/wp-admin/post.php?post=7620&action=edit Open coiled helical spring-axial load
https://www.mesubjects.net/wp-admin/post.php?post=7644&action=edit Laminated springs
https://www.mesubjects.net/wp-admin/post.php?post=7602&action=edit Salient features of springs