Wiper Blade End Cap with Movable Spoiler for Aerodynamic Stability
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Solution Overview
Problem
Existing wiper blade end cap devices face challenges in securely connecting to main components and efficiently managing aerodynamic disturbances during travel operations, making it difficult to replace wiper lips and maintain secure assembly.
Innovation Solution
The end cap device incorporates an end cap spoiler element that is securely connected to the end cap base member, featuring a resilient rail and a catch unit for non-releasable attachment, with a movably supported end cap spoiler element that can be displaced in a specific direction to facilitate assembly and disassembly, and an operating unit for releasing the catch unit without tools, ensuring secure retention and easy operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the end cap device uses a secure connection to main components, then the reliability of the connection is improved, but the device complexity increases due to the need for resilient rails and retention elements
Solution Approach 1:
The end cap device is divided into functional segments: the end cap base member for connection, the resilient rail for adaptation, and the spoiler element for aerodynamics. Each segment performs a specific function, allowing the system to achieve reliable connection through modular components rather than a single complex structure.
Solution Approach 2:
The resilient rail utilizes elastic deformation parameters to adapt to different main component geometries. By changing the curvature and extent parameters of the resilient rail, the device achieves universal compatibility while maintaining secure connection, reducing the need for multiple specialized components.
2Ease of operation
If the wiper lip replacement process is simplified, then the ease of operation is improved, but the stability of the assembly may worsen during replacement
Solution Approach 1:
The spoiler element is designed to be movable relative to the end cap base member during assembly operations. This dynamic configuration allows the spoiler to be displaced to create assembly openings for wiper arm access, then returned to its closed position to maintain aerodynamic stability during normal operation.
Solution Approach 2:
The resilient rail acts as an intermediary element between the end cap base member and the main component. It provides a controlled interface that allows temporary disassembly for wiper lip replacement while maintaining overall assembly integrity through its elastic retention properties.
3Object-affected harmful factors
If aerodynamic disturbances are prevented during travel operation, then the harmful factors are reduced, but the device complexity increases due to the spoiler element
Solution Approach 1:
The spoiler element converts potentially harmful aerodynamic forces into beneficial pressing forces. By positioning the spoiler to deflect air flow, the aerodynamic pressure generated is directed toward pressing the end cap device against the wiper blade, improving retention while eliminating disturbances.
Solution Approach 2:
The spoiler element serves multiple functions: it prevents aerodynamic disturbances, generates pressing forces for retention, and can be integrated with the end cap base member structure. This multi-functionality reduces the need for separate aerodynamic components, balancing performance improvement with structural efficiency.
4Adaptability or versatility
If the resilient rail has high elasticity to adapt to components, then the adaptability is improved, but the strength of the connection may worsen due to reduced rigidity
Solution Approach 1:
The resilient rail is pre-curved to match the expected geometry of the main component before assembly. This preliminary shaping allows the rail to flex minimally during installation while maintaining strong elastic retention, optimizing both adaptability and connection strength.
Solution Approach 2:
The resilient rail is constructed from spring steel, a composite material that combines high elastic properties with sufficient structural strength. This material selection allows the rail to adapt to different components through elastic deformation while maintaining adequate connection strength through its inherent material properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for simple and intuitive replacement of wiper lips, prevents aerodynamic disturbances, and ensures reliable and rapid securing of the end cap spoiler element, enhancing the overall performance and usability of the wiper blade system.
Implementation Method 1
which has at least one extent which can be resiliently changed in a normal operating state by at least 10%, in particular by at least 20%, preferably by at least 30% and, in a particularly advantageous manner, by at least 50%, and which in particular produces a counter-force which is dependent on a change of the extent and which is preferably proportional to the change and which counteracts the change
Implementation Method 2
the at least one end cap spoiler element has at least one substantially concave-curved main flow face. The main flow face is in particular provided to deflect an incoming air flow
Data Source
AI summary
The invention relates to an end cap arrangement, more particularly for a wiper blade (12a; 12b), comprising an end cap main part (14a; 14b) that can be fixedly connected to a main component (10a; 10b) of a wiper blade (12a; 12b). It is proposed that the end cap arrangement comprise at least an end cap spoiler element (16a; 16b) which is designed so that in an installed condition an installation opening (18a; 18b) is left free for a wiper rubber (20a; 20b).