Wiper Arm Connection Axial Tolerance Compensation
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Solution Overview
Problem
Existing wiper systems face challenges in compensating for height tolerance deviations due to positional deviations of the output shaft, which can result from manufacturing or installation tolerances, leading to inefficient wiping operations and potential contact force inconsistencies.
Innovation Solution
A wiper arm connection system that allows for axial displacement and spring-loading, enabling height tolerance compensation without a joint, using a form-fitting connection between the wiper arm and output shaft, and incorporating a spring element to apply a consistent contact force to the vehicle window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid wiper arm connection is used to ensure stable mounting, then structural stability is improved, but height tolerance compensation capability deteriorates
Solution Approach 1:
The connection section is designed with elastic properties that allow it to change its parameters (flexibility, damping characteristics) to compensate for height tolerances while maintaining structural stability during operation
Solution Approach 2:
The wiper arm connection transitions from a static rigid structure to a dynamic system where the connection section can elastically deform and adapt to positional deviations of the output shaft, enabling tolerance compensation while maintaining operational stability
2Device complexity
If a joint-free wiper arm design is implemented to simplify structure, then device complexity is reduced, but contact force consistency deteriorates
Solution Approach 1:
The spring element introduces elastic parameter changes that allow the connection section to adaptively adjust contact force, maintaining consistency despite positional variations while keeping the design joint-free and simple
3Adaptability or versatility
If axial displacement is allowed for tolerance compensation, then height tolerance compensation capability is improved, but connection stability deteriorates
Solution Approach 1:
The connection section allows dynamic axial displacement through elastic deformation to compensate for height tolerances, while the spring element provides restoring force to maintain connection stability during wiper operation
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 solution allows for efficient height tolerance compensation and consistent contact force application, enabling a joint-free wiper arm design that effectively wipes vehicle windows despite positional deviations, ensuring reliable operation and extended lifespan by preventing foreign particle ingress.
Implementation Method 1
can be spring-loaded in the direction of the vehicle body by means of at least one spring element
Implementation Method 2
connection section of the wiper arm being secured against rotation
Data Source
Figure 1~2
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AI summary
The invention relates to an arrangement (10) which has a wiper arm (12) provided with a wiper blade (14) for securing to an output shaft (20) of a wiper system (22), said output shaft being mounted on a paired vehicle body (16) in a pivotal manner about a central longitudinal axis (26) via at least one bearing element (24). A connection portion (30) of the wiper arm (12) can be secured to the output shaft (20) so as to be secured against rotation and in an axially movable manner in the direction of the central longitudinal axis (26) and can be spring-loaded in the direction of the vehicle body (16) by means of at least one spring element (48) which can be arranged in the region of the output shaft (20) in order to allow at least one height tolerance compensation of the wiper blade (14) of the wiper arm (12) secured to the output shaft (20) during operation.