Wiper Clamping Member Elliptical Cross-Section Alignment
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Solution Overview
Problem
Existing windscreen wipers lack sufficient fine adjustment capability relative to the drive shaft, limiting their alignment precision and resilience, especially when used across different vehicle models.
Innovation Solution
A windscreen wiper design featuring a rotatably mounted clamping member with an elliptical or rotationally symmetrical cross-section, allowing for adjustable contact area and easy manufacturing, along with a concave surface and recess for tool insertion to securely grip the drive shaft, enabling precise alignment and secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If knurling with fixed groove distance is used on the drive shaft and wiper arm, then standardized production is enabled, but fine adjustment capability is insufficient
Solution Approach 1:
The clamping member is divided into multiple clamping zones with different groove distances, allowing each zone to provide different levels of adjustment capability while maintaining standardized production through modular design
Solution Approach 2:
The clamping member can be rotated relative to the drive shaft to dynamically adjust the engagement position, enabling fine adjustment of the wiper alignment without requiring multiple standardized components
2Reliability
If increased knurling groove distance is used to ensure resilience, then wiper arm flexibility is maintained, but alignment precision deteriorates
Solution Approach 1:
Different regions of the clamping member have different groove distances optimized for their specific functions: larger distances for resilience and smaller distances for precise alignment, allowing both requirements to be satisfied simultaneously
3Weight of moving object
If thin wiper arm design is implemented, then aesthetic appearance and weight are improved, but adjustment range is limited by knurling geometry
Solution Approach 1:
The rotatable clamping member provides dynamic adjustment capability that is not constrained by the thickness of the wiper arm, allowing thin arms to achieve the same adjustment range as thicker arms would provide through knurling geometry
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The present invention relates to a wiper having a wiper arm (3) which has an opening into which a drive shaft (1) can be plugged, wherein a clamp-in element (4) is fitted in a rotatable manner in the opening, wherein an axis of rotation is defined by the rotation of the clamp-in element (4), and wherein the spacing between the axis of rotation and the surface of the clamp-in element (4) changes along a circumference of the clamp-in element (4). Such a wiper allows precision alignment, which is not restricted by knurling in an opening of the wiper arm.