Camshaft Phaser Locking Clearance Setting Pin
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Solution Overview
Problem
Camshaft phasers face issues with high load on bolts and undesirable noise due to inadequate locking clearance, primarily caused by manufacturing tolerances and imprecise angular alignment.
Innovation Solution
A camshaft phaser design incorporating a locking clearance setting pin that allows for angular adjustment of the locking pin bore relative to the stator, reducing the load on bolts and noise by using a pin to set the locking clearance, which can be achieved through specific pin hole arrangements and bolt configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high strength bolts are used to reliably hold together the components of the camshaft phaser, then the reliability of the camshaft phaser is improved, but the cost of the camshaft phaser increases
Solution Approach 1:
The locking clearance is pre-set during assembly using a locking clearance setting device with a locking pin and adjustable locking cover. This preliminary positioning ensures optimal clearance before operation, allowing the use of lower strength bolts while maintaining reliability, thus reducing cost without sacrificing performance
2Reliability
If the locking pin is designed to engage with the locking pin bore, then the locking function is achieved, but noise is generated due to manufacturing tolerances and imprecise angular alignment
Solution Approach 1:
A locking clearance setting device acts as an intermediary between the locking pin and locking pin bore. This device includes a locking pin positioned within a locking pin bore, with a locking cover that can be angularly adjusted relative to the stator. The intermediary device absorbs misalignment caused by manufacturing tolerances, allowing the locking pin to engage smoothly without generating noise while maintaining reliable locking function
3Adaptability or versatility
If multiple pin holes are arranged along an arcuate path with different angular spacing, then angular adjustment capability is improved, but device complexity increases
Solution Approach 1:
The locking cover is designed with multiple pin holes arranged along an arcuate path at different angular spacings, enabling dynamic angular adjustment. During assembly, the locking clearance setting device can be positioned at different angular locations by selecting different pin hole combinations, allowing optimization of locking clearance without requiring a completely different device design. This dynamic adjustability provides versatility while keeping the overall device structure relatively simple through repeated use of the same component with varying hole configurations
Data Source
AI summary
A camshaft phaser including a locking clearance setting pin is provided. The camshaft phaser includes a stator including a first plurality of pin holes extending axially in at least one of the radially inwardly extending lobes arranged along an arcuate path. A locking cover engages against a first axial end face of the stator and includes a locking pin bore and a second plurality of pin holes arranged along the arcuate path and angularly spaced apart from one another by a different angular spacing than the first plurality of pin holes. A pin extends through a respective one of the first plurality of pin holes and a corresponding one of the second plurality of pin holes, such that a location of the pin sets an angular adjustment of the locking pin bore relative to the stator.