Helical grooved pin solves fuel injection problem
A
Spirol Industries product story
Edited by the Engineeringtalk editorial team
Jul 20, 2007
The new Spirol helical grooved pin eliminates skiving of the holes and deformation of the pin and host during installation, preventing the introduction of slivers into the assembly.
To solve a problem faced by a manufacturer of diesel fuel injection assemblies, Spirol has developed a special helical grooved pin.
This pin has been designed with wide grooves and low profiled peaks that spiral around the body of the pin and create broad bearing surfaces.
This feature eliminates skiving of the holes and deformation of the pin and host during installation, preventing the introduction of slivers into the assembly.
The insertion force for Spirol's special helical grooved pin is approximately equal to the three-coil coiled pin which was previously used for this application and 25% lower than that of a traditional grooved pin.
A further benefit is that there is minimal variation in insertion force, with the insertion and removal forces about the same.
As the Spirol pin is solid, heat treated 6150 alloy steel, its shear strength is approximately 30% higher than that of the three-coil pin previously used.
This is resulting in reduced repair and replacement costs of the injector components.
With the three-coil coiled pin previously used in the diesel fuel injector, the problems arose during disassembly.
At the end of the life of the injector, its parts are disassembled, rebuilt, and then resold on the remanufactured market.
During use, carbon would occasionally build up within the fuel injector and bind a nut of the injector casing to three aligned components within the assembly.
When the injector casing was unscrewed from the base, the bound nut transmitted the torque to the pins in the aligned components.
The torque was enough to exceed the shear strength of the pins.
When the pins sheared, the pins in the tight fit blind holes became lodged and the sharp edges of the broken pins occasionally marked the mating surfaces of the components.
The result was expensive machining to repair the assembly, and at times, the components are irreparable and must be discarded.
The manufacturer therefore approached Spirol to design a pin that had higher shear strength than the three-coil pin in order to withstand the torque generated during disassembly.
The pin still needed to be configured such that it did not cause deformation of the host material or debris during installation.
The special helical grooved pin has met all these requirements.
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