I want to calculate the rate of the spring of my car, but I don’t know how to count the number of active coils and the total number of coils. The number of active coils should be from which to which coil? Both ends of the spring have a shape that looks like a Kintaro candy to me.
Thank you for your inquiry!
The spring in the photo is a general cylindrical coil spring that does not have the end coils on both ends, so all the coils are active coils.
The number of effective coils changes with the load ( starting when the coil parts at the ends of the spring start contact with each other).
Therefore, to put it simply, the number of active coils is calculated by subtracting the number of end coils from the total number of coils.
Banetto kun, I don’t understand again.
It is difficult to determine the number of active coils and end coils because, depending on how much the contacted surface and the coil parts on both ends contact, the number of active coils and end coils changes accordingly.
Does it mean that the spring rate changes depending on the installation situations? (For example, when both ends of the spring are installed by point contacts and when they are installed on surfaces).
In other words, when calculating the spring rate, does the value calculated for a single spring differ from the value calculated in consideration of the installation situations?
Hello!
Depending on the surface to which the spring is attached, the number of active coils can decrease.
This leads to the change in the spring constant.
Banetto kun, thank you so much for all your replies.
However, as shown in the photo, the rubber insulators along the top and bottom of the spring follow the winding of the spring.
In this case, should the parts that are in contact with the insulator be considered the end coils?
Hello!
Well, the parts that are in contact with the insulator do not work as active coils, and are called the end coils.
Please consider this when counting the number of active coils!
