Synopsis on Spring stiffness Testing Hydraulic based



Spring stiffness Testing Hydraulic based


Springs isolate the driver from road imperfections by allowing the Tyre to move over a bump without drastically disturbing the chassis. If the chassis remains fairly steady then the Tyre are better able to follow road contours automatically. While springs do an excellent job of smoothing over bumps, they will keep bouncing once started. In other words, the chassis continues swaying and the Tyre keep hopping long after the vehicle strikes a bump. Left uncontrolled, springs give an uncomfortable ride with very poor Tyre to road contact. To control this undesirable behavior, a shock absorber keeps the spring from over reacting to every bump or dips and not only prevents but also balances excess movement of the Tyre and chassis. Springs are durable items and are easily inspected. If the ride height of a vehicle has decreased excessively or a coil/leaf has broken it is advisable to replace the springs in axle sets. Consumers often change springs to alter their vehicle’s ride and handling characteristics. Spring problems are generally easy to identify.


An engineer is always focused towards challenges of bringing ideas and concepts to life. Therefore, sophisticated machines and modern techniques have to be constantly developed and implemented for economical manufacturing of products. At the same time, quality and accuracy factor is considered. A spring is defined as an elastic machine element, which deflect under the action off the load and returns to its original shape when the load is removed. Stiffness and spring index are the main parameters of spring design. Spring stiffness is the force per unit deflection. These parameters are considered for defining the spring. In designing and developing the spring testing machine, these parameter is considered. Hydraulic principle considered while designing and developing the stiffness machine.

Many companies manufacture valves and they required the springs for installing in their products

(hydraulic valves). Depending upon the valve size there is variations in sizes and shapes of springs, hence company are facing problem of checking stiffness of spring. Understanding the Industry problems, we have designed and developed a hydraulic spring stiffness testing machine. 

Block Diagram:


Application of hydraulic spring stiffness testing machine:

  • The machine is used for measuring spring stiffness for different spiral and helical springs.

  • Can be used in garages where frequent inspection of the suspension of various automobiles is carried out.

  • With the help of this machine it is possible to analyze when to replace the suspension by comparing the stiffness of the testing suspension with that of the standard stiffness.


The spring stiffness testing machine is designed and developed by using hydraulic principle. It consist mainly large cylinder, small cylinder, deflection scale and bourdon tube gauge. On the spring stiffness testing machine we can test spring having diameter range of 40 mm to 70 mm. The results have been verified with the calibrated digital stiffness testing machine. This machine reduces the checking time and cost when compared with conventional machine.

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