Wiper Arm Head Linkage Structure for Rattle-Free Blade Swing
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Solution Overview
Problem
The existing wiper devices suffer from rattling of the retainer with respect to the arm head, leading to decreased wiping performance and abnormal noise generation.
Innovation Solution
The wiper device incorporates a design with specific abutment surfaces and linkage parts on both the arm head and shank, ensuring stable engagement and minimizing rattling through distributed load application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the linkage shaft is disposed at a front end of the arm head, then the structure is simplified, but the retainer is prone to rattling with respect to the arm head in the wiping direction
Solution Approach 1:
The linkage structure is segmented into multiple functional parts: the linkage shaft, the retainer with linkage recess, and the arm head with abutment surfaces. This segmentation allows each component to perform its specific function while working together to eliminate rattling. The retainer is divided into a body and a separate linkage recess portion, enabling independent optimization of each part.
Solution Approach 2:
The linkage shaft acts as an intermediary element between the arm head and the retainer body. It transmits the swinging motion while the abutment surfaces on the arm head and retainer provide intermediate contact points that prevent rattling. The linkage recess serves as an intermediary structure that accommodates the linkage shaft while maintaining stable engagement.
2Ease of operation
If the retainer is rotatably linked to the arm head, then the wiper blade can be swung, but abnormal noise is generated due to rattling
Solution Approach 1:
The abutment surfaces are preliminarily positioned to prevent rattling before it occurs during the wiping operation. The first and second abutment surfaces on the arm head are arranged to contact the corresponding surfaces on the retainer in advance, creating preliminary constraints that prevent the retainer from rattling during the swinging motion in the wiping direction.
Solution Approach 2:
The linkage recess is designed with sufficient depth to accommodate the linkage shaft, providing beforehand cushioning that prevents excessive movement and rattling. This pre-designed clearance and engagement structure ensures that the retainer remains stably linked to the arm head throughout the wiping operation, eliminating abnormal noise.
3Reliability
If abutment surfaces are added to the arm head and shank, then rattling is suppressed, but the device complexity increases
Solution Approach 1:
The abutment surfaces are merged with the existing arm head and retainer structures rather than being separate components. The first and second abutment surfaces are integrated into the arm head's geometry, and the corresponding abutment surfaces are integrated into the retainer body and linkage recess. This merging approach suppresses rattling while minimizing the increase in device complexity.
Solution Approach 2:
The arm head and retainer structures serve multiple functions: they provide the rotational linkage for the wiper blade while simultaneously incorporating abutment surfaces that suppress rattling. The linkage recess not only accommodates the linkage shaft but also provides the necessary abutment surfaces for noise reduction. This multi-functionality reduces the need for additional dedicated anti-rattling components.
Data Source
AI summary
An arm head includes: outer surface parts; a linkage recess provided between the outer surface parts; and front head-side abutment surfaces and rear head-side abutment surfaces provided at the outer surface parts and disposed on two sides of the linkage recess in a long-side direction of the arm head. An arm shank includes: inner surface parts; a linkage shaft provided between the inner surface parts; and front shank-side abutment surfaces and rear shank-side abutment surfaces provided at the inner surface parts, disposed on two sides of the linkage shaft in a long-side direction of the arm shank, and abutted against the front head-side abutment surfaces and the rear head-side abutment surfaces.