Camshaft Phaser Pin Alignment for Target Wheel
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Solution Overview
Problem
Camshaft phasers in internal combustion engines face misalignment issues during shipping and handling, which can lead to inaccurate valve timing and improper engine operation, as the target wheel and rotor may become angularly misaligned without the valve bolt, which is installed post-assembly.
Innovation Solution
A pin is installed during assembly to maintain correct rotational positioning between the target wheel and rotor, acting as both a connection and alignment feature, and extends through aligned holes to secure the target wheel to the rotor, ensuring proper angular positioning and preventing misalignment during subsequent handling and installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the valve bolt is installed post-assembly, then the assembly process is simplified and disassembly is easier, but the target wheel and rotor become prone to angular misalignment during shipping and handling
Solution Approach 1:
The pin is installed during assembly to preliminarily secure the target wheel to the rotor in the correct angular position. This preliminary action maintains alignment stability during shipping and handling, and the pin is removed later to allow valve bolt installation, thus resolving the contradiction between assembly simplicity and alignment stability.
2Manufacturing precision
If the target wheel is securely attached to the rotor, then accurate valve timing is maintained, but the structure becomes more complex and requires additional components
Solution Approach 1:
The pin is extracted (removed) after serving its alignment purpose during assembly and shipping. This temporary component ensures accurate valve timing by securing the target wheel to the rotor during critical phases, then is removed to simplify the final structure and allow valve bolt installation, thus resolving the contradiction between manufacturing precision and device complexity.
3Measurement precision
If the pin is used as both connection and alignment feature, then the alignment precision is improved, but the device complexity increases due to the additional component
Solution Approach 1:
The pin serves multiple functions: it acts as both a connection feature to secure the target wheel to the rotor and an alignment feature to maintain correct angular positioning during assembly and shipping. This multi-functionality improves rotational alignment precision while minimizing the increase in device complexity by using a single component for dual purposes.
Data Source
AI summary
A camshaft phaser includes a stator defining a cavity and configured to receive power from an engine crankshaft. The phaser further includes a rotor supported within the cavity and rotatable relative to the stator. The rotor has a first face, a second face, and a first hole extending from the first face to the second face. A target wheel of the phaser has a plate portion configured to be read by a camshaft-position sensor and a hub portion seated on the first face. The hub portion defines a second hole that is aligned with the first hole. A pin extends through the first and second holes to rotationally align and secure the target wheel to the rotor.