Cast Wiper Arm Fixing Device with Securing Elements
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Solution Overview
Problem
Existing cast fastening devices for wiper arms lack effective and economical means to securely fasten and replace retaining pins and bearing bushes, leading to potential instability and increased production costs.
Innovation Solution
A cast fastening device with a first receptacle for a bearing bush and a second receptacle for a retaining pin, featuring securing elements that lock the components in place, allowing for easy replacement and stable fixation using a central part with an arcuate cross-section and spring sections that expand to secure the components laterally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional deformation die method is used to secure retaining pin, then securing function is achieved, but manufacturing complexity and production costs increase
Solution Approach 1:
The invention extracts the securing function from the complex deformation die process and consolidates it into a simple integrated groove structure that is directly formed during casting. This eliminates the need for separate deformation operations while maintaining the retaining pin securing function.
Solution Approach 2:
The receptacle groove and securing groove are merged into a single integrated structure formed during the casting process. This combines the retaining pin receptacle and the securing function into one feature, eliminating multiple manufacturing steps and reducing overall complexity.
2Ease of repair
If retaining pin and bearing bush are secured in groove-shaped receptacles, then replacement capability is improved, but structural complexity increases
Solution Approach 1:
The fastening device is segmented into distinct functional zones: the first receptacle for the bearing bush with its securing groove, and the second receptacle for the retaining pin with its securing groove. This segmentation allows independent replacement of each component while maintaining a relatively simple overall structure through the use of identical groove-based securing mechanisms.
Solution Approach 2:
Both the bearing bush and retaining pin are secured using the same groove-based mechanism, creating a universal securing approach. This multi-functional design allows the same structural principle to serve multiple components, simplifying the overall device complexity while enabling easy replacement of either component independently.
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
Ensures reliable and economical securing of retaining pins and bearing bushes, facilitating easy replacement and reducing production costs while maintaining structural integrity.
Implementation Method 1
a spring section is arranged laterally on the central part of the securing element, each section being designed to protrude from the central part and designed to expand in the receptacle
Data Source
Figure 1
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AI summary
The invention relates to a cast fixing device 2 for a wiper arm 1, having a first receptacle 15 and a second receptacle 16, wherein a bearing bush 12 is arranged in the first receptacle 15 to provide an articulated connection to the wiper arm 1, and a locking pin 10 for fixing a spring 9 of the wiper arm 1 is arranged in the second receptacle 16, wherein a securing element 13; 14 is provided above the bearing bush 12 in the first receptacle 15 and/or above the locking pin 10 in the second receptacle 15, 16 and is designed to block an opening of the corresponding receptacle 15, 16.