Rubber Pad Design: Selection & Considerations

[Mormont]

Hello All,

Very new to design , especially in material selection and rubber stuff.

I have requirement where piston/shaft reciprocates to housing at high speeds. In order to reduce noise and for safety reasons, I must add rubber pads on both. Application as below:

Red part is the shaft/piston (around 15mm Dia.) with a yellow rubber pad
Blue part is the housing with green rubber pad.
Arrow indicated in 2nd pic for direction of reciprocation.

Speed is around 25-30 Hz for reciprocating movement.

Queries;
1. What rubber material I could use for such application?
2. Is there any food grade rubber for this application?
3. What could be major design consideration for this?

Any direction or resources would help.

Thanks!

 

[JRMichler]

How hard is the moving part hitting - speed, mass, kinetic energy, and momentum. How much energy is the bumper absorbing per cycle? Once you have that information, here is a couple of good resources:

https://www.lord.com/products-and-solutions/vibration-and-motion-control/industrial
https://www.sorbothane.com/material-properties.aspx

Your bumper must be designed to absorb the kinetic energy, momentum, and dissipate the heat. In an application such as yours, the heat generated may well be the most challenging specification to meet.

 

[Dr.D]

Why do you need to put pads on both parts? Would it not be simpler, and perhaps more effective to design a single, deeper pad?

 

[Mormont]

@https://www.physicsforums.com/members/jrmichler.632719/: Thank you very much for this, I can take look and get back. Hopefully I can get something which is food grade.
@Dr.D: Agree with you, however, I work in an industry where safety is paramount. And unfortunately, my requirement necessitates the use of 2 pads for the same reason.