Wiper Connecting Hook Line Contact Stress Reduction
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Solution Overview
Problem
Existing windshield wipers experience a short lifespan due to high contact stress between the C-shaped connecting hook and the column pin, leading to wear and reduced durability.
Innovation Solution
A connecting hook with a first hooking portion in line contact and a second hooking portion in circular arc contact, transitioning smoothly, is integrated into the wiper design, providing a line contact with the pin and reducing stress, while being punched from a metal sheet for structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a C-shaped connecting hook with circular cross-section is used, then the wiper structure is simple and easy to manufacture, but the contact stress between the hook and column pin is large leading to wear and short lifespan
Solution Approach 1:
The connecting hook employs different cross-sectional shapes at different locations: a circular cross-section at the second hooking portion (for ease of manufacture and connection) and a non-circular cross-section at the first hooking portion (to reduce contact stress with the column pin). This local differentiation allows the structure to optimize for both manufacturing simplicity and operational reliability in different regions.
Solution Approach 2:
The connecting hook is divided into two distinct portions: a first hooking portion that interfaces with the column pin and a second hooking portion that connects to the resilient element. Each portion is independently optimized for its specific function, with the first portion designed for reduced contact stress and the second portion designed for manufacturing simplicity.
2Device complexity
If a C-shaped connecting hook with circular cross-section is used, then the structure is simple, but point contact with the column pin creates large contact stress and wear
Solution Approach 1:
The connecting hook employs different cross-sectional shapes at different locations: a circular cross-section at the second hooking portion (for simplicity) and a non-circular cross-section at the first hooking portion (to reduce contact stress with the column pin). This local differentiation allows the structure to optimize for both manufacturing simplicity and operational reliability in different regions.
Data Source
Figure 1~3
Figure 4~5
Figure 6~8
AI summary
A connecting hook (3, 5) and a wiper (100, 200) are disclosed. The wiper (100, 200) comprises an arm head (1) mounted with a column pin (10), a retaining arm (2) connected to the arm head (1) while being rotatable relative to the arm head (1), and a connecting hook (3, 5). The connecting hook (3, 5) has a first hooking portion (31, 51) and a second hooking portion (32, 52) which are formed integrally. The first hooking portion (31, 51) is mounted to the pin (10), and the second hooking portion (32, 52) is mounted to a resilient element (20) which is pre-load. The first hooking portion (31, 51) has a first contacting surface (310, 510) contacting the pin (10) in line contact. Thereby, contacting stress between the connecting hook (3, 5) and the pin (10) is decreased, wear of the connecting hook (3, 5) and the pin (10) is reduced and life span of the wiper (100, 200) is improved.