Oil Filter Element with Radial Traction Surfaces
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Solution Overview
Problem
Existing oil filter assemblies, particularly in large vehicles like trucks, face difficulties in filter replacement due to the size and design of the oil filters, making it challenging for users to exchange them effectively.
Innovation Solution
A filter element with radially projecting traction surfaces and mating surfaces arranged at a distance along the longitudinal direction, forming a key-lock system that prevents incorrect mounting and ensures easy removal, utilizing a bayonet closure mechanism for secure engagement with the filter housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the oil filter is made large to meet the requirements of trucks, then the filtering capacity is improved, but the ease of operation deteriorates because it becomes difficult for users to exchange
Solution Approach 1:
The filter element is divided into multiple segments with individual traction surfaces, allowing the large filter to be manipulated and exchanged more easily while maintaining its large filtering capacity
Solution Approach 2:
The traction surfaces act as an intermediary mechanism between the user's gripping tool and the large filter element, providing secure engagement points that make it easier to handle and exchange the oversized filter
2Reliability
If the filter element is secured to the filter housing cover with entrainment contours, then the reliability of secure mounting is improved, but the device complexity increases
Solution Approach 1:
The bayonet wings are positioned asymmetrically at different angular positions around the filter element, creating a key-lock system that ensures correct orientation and secure mounting while maintaining relatively simple geometry
Solution Approach 2:
The bayonet closure mechanism automatically engages and locks when the filter element is inserted in the correct orientation, providing self-verifying secure mounting without requiring additional complex fastening operations
3Manufacturing precision
If all bayonet wings are arranged at the same level, then the manufacturing precision is improved, but the ease of operation deteriorates because it prevents easy removal
Solution Approach 1:
The bayonet wings are designed with different axial positions that enable a dynamic extraction motion, where the filter element can be removed by pulling in a specific direction that disengages the bayonet wings sequentially, making removal easier while maintaining precise manufacturing tolerances
4Ease of operation
If multiple traction surfaces are spaced apart in the longitudinal direction, then the ease of operation is improved for removal, but the device complexity increases
Solution Approach 1:
Multiple traction surfaces are merged into a unified bayonet closure mechanism where the bayonet wings serve both as mounting features and as extraction aids, reducing overall device complexity while maintaining ease of removal
Data Source
AI summary
A filter element has a first follower element with a first traction surface and a second follower element with a second traction surface provided for interacting with first and second mating surfaces of the filter housing, respectively. The first and second traction surfaces interact with the first and second mating surfaces to pull out the filter element from the filter housing. The first and second traction surfaces are spaced apart from each other along a longitudinal axis of the filter element and project radially into the interior of the filter element. At least one of the first and second follower elements has a stop surface adjoining circumferentially the respective traction surface. In a position of use, the stop surface interacts with a counter stop surface of the filter housing to form an at least unidirectional rotational degree of freedom blocking about the longitudinal axis relative to the filter housing.