When observing a strange noise generated from the hinge connected to a torsion coil spring, I discovered that the adjacent coils of the spring rub against each other, causing red rust, and it seems that the strange noise is generated from there. It seems like some structures have strange noise and some don’t even though they operate in the same way.
・What is the difference between structures that generate strange noise and structure that do not? (Even though similar red rust appears for those that do not make the noise.)
・Is it better to assume that the ones that do not make the noise now will do in the future?
・What should be done to prevent noise? (Grease and other lubricants cannot be applied for appearance reasons)
Thank you for your question!
There are two possible causes for the strange noise of the torsion springs: the contact between the coils and the guide rod, and the contact between the coils. As a countermeasure, it is possible to reduce the diameter of the guide rod and leave a space between the coils. As for the springs that do not make any sound at the moment, because the noise appears in other springs with the same specifications, it is possible that the noise may occur in the future for these spring.
Thank you for your reply.
After that, it was confirmed that the same strange noise continued even if the guide rod was removed and the springs were used on their own. Therefore, it was determined that it was due to the contact between the coil parts which you pointed out. As a countermeasure, we are thinking of opening a gap between the coils as we were instructed, but it is not easy because there is a problem of the space where the spring is installed.
By the way, what is the difference between the ones that make and do not make noise (or rather, it may be better to say that they make noise in a short time and do not make noise unless you use them for a long time)?
I have some hypotheses as follows, what do you think?
① If the pressure on the contacting coil part is low and evenly distributed in that part, that strange noise is unlikely to occur, and if there is a part where the pressure is unevenly distributed and locally high, that part will wear out in a short time and the noise appears.
② The strange noise is generated only when the pressure is within a certain range, and it is not generated when the pressure is higher or lower than that range.
③ Even if the strange noise appears, and you continue to use the spring, the pressure will eventually decrease due to wear and the noise will disappear.
I am assuming such things, but is any of them might be correct? Or is there some other bigger factor besides this? It would be appreciated if you can tell me.
Dear Oda,
Although the cause cannot be 100% determined, isn’t the hypothesis ① a possible factor?
I think that the tension of the coil part will decrease and the strange noise will slowly disappear with continued use.
(* Other factors may be the friction with the guide bar.)
