SPIROL Introduces New Precision Machined Compression Limiters to Protect Plastic Assemblies

SPIROL is pleased to introduce the new Series CL6000 lightweight, lead-free, Aluminum Precision Machined Compression Limiters. Compression Limiters are designed to reinforce high stress joints in plastic assemblies where bolts are used to connect two components to each other.

Reinforcement for Fuel Evaporation Canister

An industry leader in fuel systems designed a new evaporation canister, part of a vehicle’s emissions system. The assembly was composed of plastic, with a chamber where gasoline fumes are filtered through charcoal and a lid with a cylindrical hose fitting though which fumes are able to flow. The original design did not offer any reinforcement to the plastic hose fitting, and the OEM was concerned about its ability to maintain structural integrity over the lifespan of the fuel system.

The reinforcing component had to be self-retaining, resistant to the harsh corrosive environment, and allow fumes to flow freely through its center. The customer initially considered using Slotted Pins to reinforce the plastic tube; however they requested SPIROL’s assistance in determining the best component for their application.
app coiled pin fuel evaporator canister

Fuel evaporation canister with Light Duty Coiled Spring Pin inserted into hose fitting

app coiled pin fuel evaporator canister drawing

Cutaway illustration of Coiled Spring Pin in hose fitting

After evaluating the application, SPIROL Engineering recommended the use of a stainless steel Light Duty Coiled Pin. Similarly to the Slotted Pin, the light duty pin is self-retaining, yet unlike the Slotted Pin, the Light Duty Coiled Pin does not exert excessive force that could damage the plastic tube. The Coiled Pin is manufactured from 300 series stainless steel to eliminate the risk of corrosion. Due to the thin layers of wrapped stainless steel, the Light Duty Coiled Pin provides the largest inner diameter of any standard Spring pin, allowing maximum functional volume for fume flow through the center of the pin.

The spring properties of the light duty Coiled Pin provide ample structural integrity; while the associated flexibility keeps the plastic host from cracking or deforming.

SPIROL’s pro-active approach to the customer’s original request for samples resulted in a formal recommendation that resolved their application problem and exceeded their expectations for responsiveness and technical assistance.

Our staff of engineers will review your application needs and work with your design team to recommend the best solution.

Need help finding the right solution?

SPIROL offers complimentary Application Engineering support. We will assist on new designs as well as help resolve issues, and recommend cost savings on existing designs.