Coiled spring pin used in oil pump design
A
Spirol Industries product story
Edited by the Engineeringtalk editorial team
Jun 1, 2009
Spirol has reported how it recommended a coiled spring pin for a new design of engine oil pump to reduce cost, total assembly weight and installation forces.
The automotive industry historically has used machined solid dowels to align various engine components to the block.
The sole purpose of the dowels is to provide finished assembly alignment to the engine block.
A manufacturer approached Spirol Industries' applications engineering department to determine the best alignment pin for a new design of engine oil pump.
Following a comprehensive design review, Spirol recommended the use of a standard duty coiled spring pin as the alignment pin.
Coiled pins are designed such that their pre-installed diameter is larger than the recommended hole.
The diameter of the coiled pin is compressed during insertion, which prevents deformation of the hole in the pump resulting in a good 'press fit' between the pin and the hole.
Once installed, the coiled pin retains itself by exerting constant radial force against the hole-wall as it attempts to recover back to its pre-installed diameter.
Retention values can be quite high depending on the hole-size, host material and 'duty' of the pin.
Standard duty coiled spring pins offered the optimum balance of strength and flexibility that exceeded all of the performance requirements for this application.
This low cost solution was within Spirol's standard range and therefore prototypes were supplied quickly for testing and evaluation in the assembly.
By replacing the rigid solid dowel with a coiled spring pin, the customer was able to achieve the primary goal of reducing cost.
Savings were also achieved through the reduction in hole-preparation time, reduction in weight of the final assembly, lowering of installation forces and the decrease in total assembly time.
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