Filter Arrangement Axial Stop Relocation Tolerance Design
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Solution Overview
Problem
The existing filter arrangements with ring filter elements face challenges in determining tolerances between the filter housing cover, bowl, and the ring filter element due to the inclusion of filter material in the axial stop mechanism, making it difficult to simplify the tolerance design and increasing the risk of pleat block formation and unauthorized installations.
Innovation Solution
The axial stop is relocated from the lower end plate to the upper end plate, with a complementary guide contour and slide-off barrier, allowing for a more precise tolerance design and preventing twisting and unauthorized installations by forming a key-lock principle, and the axial stop is designed as a circular ramp or chamfered cannula to prevent damage and pleat block formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the axial stop is arranged on the lower end plate, then the filter element can be stopped axially in the filter housing, but the tolerance design becomes difficult because the filter material is included in the determining
Solution Approach 1:
The axial stop function is separated from the filter material and assigned to the upper end plate. This segmentation isolates the tolerance-determining function from the filter material, allowing independent tolerance specification for the end plate and filter material, thereby simplifying the overall tolerance chain.
Solution Approach 2:
Instead of stopping the filter element from below via the lower end plate, the axial stop is inverted to the upper end plate. This inversion relocates the critical tolerance-determining interface away from the filter material, enabling simpler tolerance design while maintaining the same axial stopping function.
2Manufacturing precision
If the axial stop is arranged on the upper end plate, then the tolerance design is simplified, but the contact surface between the axial stop and the ramp may be punctiform causing damage
Solution Approach 1:
The axial stop is designed with a curved or rounded contact surface that complements the ramp geometry. This curvature ensures a line or area contact rather than a punctiform contact point, distributing the load and preventing damage while maintaining the simplified tolerance design benefits of the upper end plate location.
3Manufacturing precision
If the guide element and axial groove are provided for positioning, then the pin can be introduced exclusively into the channel, but unauthorized filter elements may still be installed
Solution Approach 1:
The axial stop is designed with an asymmetric geometry that creates a key-lock principle with the ramp. The specific shape and orientation of the axial stop relative to the ramp allow only authorized filter elements with matching asymmetric features to be installed, preventing unauthorized installations while maintaining precise positioning through the guide element and axial groove.
Data Source
AI summary
A filter arrangement may include a filter housing and a ring filter element arranged in the filter housing. The ring filter element may include an upper end plate, a lower end plate, and a filter material arranged therebetween. An axially projecting pin may be disposed on the lower end plate and may engage into a channel on a filter housing side. The filter arrangement may also include a tubular dome which may engage into an interior of the ring filter element. The tubular dome may have a guide contour. The guide contour may cooperate with a guide element arranged on the ring filter element and may have an axial groove. The guide contour may be configured as at least one of a circular ramp and a chamfered cannula. On the upper end plate, an axial stop may project into the interior of the ring filter element.