Automotive Ignition Coil
A manufacturer of automotive ignition coils approached SPIROL seeking a cost effective alternative to a machined brass Compression Limiter. Preferred method of installation was molded in. Compression Limiters were required to protect the integrity of the plastic case when bolting to the mating component. Three limiters were required per coil, one of which would protrude from the base to double as an alignment feature. For this reason, the end customer specified a high retention value to ensure the protruding Compression Limiter maintain its position.
The elimination of brass offers the most significant cost savings. Steel can provide the necessary strength at a much lower cost. Compression Limiters can be manufactured of low or high carbon steel and delivered soft or hard dependent upon fastener grade. Method of manufacture is the second component of cost that can be reduced. Machining or cutting operations are typically more expensive than forming. The best way to reduce the customer’s cost was to convert them from the machined brass component to a roll formed steel Compression Limiter.