Compressed Air Supply Device Eccentric Cartridge Mounting
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Solution Overview
Problem
The existing compressed air supply devices for commercial vehicles face challenges in ensuring error-free and reliable installation of air dryer cartridges, particularly due to the need for precise angular alignment and the risk of using unsuitable cartridges, which can lead to incorrect mounting and operational issues.
Innovation Solution
The solution involves arranging the connection and coupling areas eccentrically to the axis, providing a single axis of symmetry, and incorporating projections and recesses to ensure precise alignment and anti-twist protection, allowing the air dryer cartridge to be mounted in a single defined orientation, preventing rotation during fixing, and using a bayonet lock or similar fastening methods for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connection areas are arranged axially symmetrically, then the air dryer cartridge can be installed in any angular position, but it is impossible to prevent incorrect installation of unsuitable cartridges
Solution Approach 1:
The connection area on the valve housing and the associated coupling area on the air dryer cartridge are arranged eccentrically to the axis, breaking the axial symmetry. This asymmetry ensures that only cartridges with matching coupling area geometry can be correctly installed, preventing incorrect installation while eliminating angular position flexibility.
2Ease of operation
If a threaded connection is used, then the air dryer cartridge is easily replaceable by the driver, but additional mounting height is required and no prevention of unsuitable cartridge installation
Solution Approach 1:
The connection is segmented into multiple functional elements: an eccentric connection area for alignment, a bayonet lock mechanism for secure attachment, and a threaded fastening element for final securing. This segmentation allows the cartridge to be easily replaced by the driver while preventing incorrect installation through the geometric matching requirement of the eccentric areas.
Solution Approach 2:
The eccentric connection areas perform a preliminary alignment action during installation, forcing the cartridge into the correct angular position before the bayonet lock and threaded fastening engage. This preliminary action prevents incorrect installation of unsuitable cartridges while maintaining ease of replacement.
3Reliability
If the connection areas are arranged eccentrically, then precise alignment and prevention of incorrect installation are achieved, but the device complexity increases
Solution Approach 1:
The eccentric arrangement of connection and coupling areas creates an asymmetric geometry that inherently provides alignment guidance and prevents incorrect installation. This asymmetric design achieves high installation accuracy without requiring complex alignment mechanisms or additional sensors.
Solution Approach 2:
The eccentric connection areas perform self-alignment during the installation process, automatically guiding the cartridge into the correct position without requiring external alignment tools or complex adjustment mechanisms. The geometry itself provides the alignment function, reducing overall device complexity.
Data Source
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AI summary
The invention relates to a compressed air supply device (10) for a commercial vehicle (12), comprising a valve housing (14) and an air dryer cartridge (16), wherein the valve housing (14) and the air dryer cartridge (16) are connected to each other via a first seal (18) and a second seal (18'). According to the invention, a connection area (22) arranged on the valve housing (14) and located in a coupling surface (20) between the valve housing (14) and the air dryer cartridge (16) is not, in all angular positions of the air dryer cartridge (16) relative to the valve housing (14) defined with respect to an axis (24) of the air dryer cartridge (16), able to be aligned with a coupling area (26) arranged on the air dryer cartridge (16) and associated with the connection area (22).