Rotatable Bayonet Ring Reduces Filter Housing Torque
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Solution Overview
Problem
Filter elements in fluid filters often experience high frictional resistance when coupled to the filter housing, making replacement difficult due to the need for high torque when screwing or unscrewing the housing cover, which requires significant effort.
Innovation Solution
The filter element features a bayonet ring that can rotate about its longitudinal axis, allowing for rotational adjustment with the housing cover without inhibiting the bayonet lock, reducing the torque required for unscrewing and screwing, and enabling easier removal by allowing the filter element to be moved out along its axis with reduced force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filter element is sealed radially against the filter housing to ensure sealing performance, then sealing reliability is improved, but frictional resistance increases making replacement difficult
Solution Approach 1:
The invention divides the coupling system into two independent functional parts: a bayonet coupling mechanism for rotational attachment and a radial sealing element for sealing. The bayonet locking elements engage with corresponding elements in the filter housing to provide mechanical coupling, while the sealing element independently provides sealing without interfering with the bayonet rotation. This segmentation allows the sealing function to be maintained while eliminating the frictional resistance that previously hindered replacement operations.
2Strength
If high torque is applied to overcome frictional resistance during screwing, then the housing cover can be attached, but the operation requires considerable effort
Solution Approach 1:
The bayonet coupling mechanism acts as an intermediary that transfers the attachment function from a high-friction radial sealing interface to a low-friction rotational interface. By engaging the bayonet locking elements first, the system creates a mechanical advantage that allows the housing cover to be attached with reduced effort, as the bayonet mechanism guides the engagement and reduces the effective friction that must be overcome during the attachment operation.
Data Source
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AI summary
The invention relates to a filter element (10) for filtering a fluid, particularly a fuel or oil, arranged such that it can be replaced in a filter housing (52). Said filter element (10) comprises first bayonet closure elements (26) by means of which the filter element (10) can be coupled to second bayonet closure elements (64) of the filter housing (52). The first bayonet closure elements (26) are, according to the invention, positioned on a bayonet ring (22) which is mounted on the filter element (10) such that it can rotate relative to the longitudinal axis (18) of the filter element (10). The invention also relates to a fluid filter, particularly a fuel or oil filter, particularly for an internal combustion engine comprising such a filter element (10).