Cam Phaser Retention Feature for Assembly Alignment
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Solution Overview
Problem
The assembly of cam phasers is complicated by the need for precise alignment of components, which can be difficult to maintain due to loose parts inadvertently rotating during assembly, leading to potential misalignment and assembly challenges.
Innovation Solution
Incorporation of a retention feature with tabs on the check valve plate and corresponding indentations on other components, such as the locking cover and stator, to align and secure the parts during assembly, ensuring proper alignment of openings and features for fastening and fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If loose components are positioned during assembly without retention features, then assembly flexibility is improved, but component alignment stability deteriorates
Solution Approach 1:
The retention feature (tabs and indentations) is pre-formed on components before assembly begins. This preliminary structural preparation enables the loose component to be positioned flexibly initially, then securely retained once aligned, resolving the contradiction between assembly flexibility and alignment stability.
Solution Approach 2:
The retention feature acts as an intermediary mechanism between the loose component and the assembly structure. The tabs on the loose component engage with corresponding indentations on stationary components, providing a mediating retention mechanism that maintains alignment stability without restricting initial positioning flexibility.
2Manufacturing precision
If retention features are added to maintain component alignment, then alignment precision is improved, but device complexity increases
Solution Approach 1:
Rather than adding complex retention mechanisms throughout the entire assembly, the retention feature is applied locally at specific critical interfaces where alignment precision is needed. The tabs and indentations are positioned only at locations requiring alignment retention, maintaining simplicity elsewhere in the structure.
Solution Approach 2:
The retention feature uses asymmetric tab and indentation geometries that provide precise alignment in the required direction while maintaining simplicity. The asymmetric shape ensures proper orientation and alignment without requiring complex symmetric mechanisms, achieving alignment precision with minimal structural addition.
Data Source
AI summary
A cam phaser has a stator, a rotor positioned in the stator and including a locking pin, a locking cover including a receiving feature for receiving the locking pin, a cover plate, and a check valve plate positioned between the stator and the locking cover and including a plurality of valve elements. The cam phaser also has a plurality of first openings in each of the stator, locking cover, and check valve plate, a plurality of second openings in the locking cover, and a third opening formed in the check valve plate. The cam phaser further includes a retention feature for aligning components of the cam phaser during assembly, the retention feature including one or more tabs on a first component and one or more indentations on a second component receiving the one or more tabs.