SHORT QUESTION ANSWERS

-SPRINGS CLASS NOTES FOR

MECHANICAL ENGINEERING

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