Metal-Plastic Steering Gearwheel With Segmented Molded Sections
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Solution Overview
Problem
Existing gearwheels for steering mechanisms in vehicles face challenges in achieving cost-effective production while maintaining sufficient load-bearing capacity and useful life, particularly in reducing plastic flow paths during injection molding.
Innovation Solution
A gearwheel design featuring a metal insert portion and a plastic outer portion, where the plastic is injection-molded onto the metal insert with spaced injection-molded sections on the side surface, reducing plastic flow paths and allowing for improved after-pressure feeding during injection molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the outer portion is injection-molded onto the insert portion with continuous injection-molded sections forming a complete ring, then the structural integrity and load-bearing capacity are improved, but the plastic flow paths become excessively long and production cost increases
Solution Approach 1:
The outer portion is divided into multiple separate injection-molded sections that are spaced apart on the side surface of the insert portion, rather than forming a continuous ring. This segmentation reduces the plastic flow paths during injection molding, improving manufacturability and reducing production costs while maintaining sufficient structural integrity through the distributed arrangement of sections.
2Ease of manufacture
If the injection-molded sections are spaced apart on the side surface, then the plastic flow paths are reduced and production cost decreases, but the structural integrity may be compromised
Solution Approach 1:
The injection-molded sections are strategically positioned on the side surface of the insert portion to provide localized reinforcement where needed. The spaced arrangement allows each section to independently contribute to structural integrity at critical locations without requiring continuous coverage, optimizing the balance between manufacturing efficiency and structural performance.
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 design enables the production of gearwheels that are both cost-effective and possess improved physical properties, including enhanced load-bearing capacity and extended useful life, while minimizing plastic usage and optimizing injection molding processes.
Implementation Method 1
the outer portion is injection-molded onto the insert portion
Data Source
AI summary
A gearwheel has an insert portion made of metal and an outer portion made of plastic, where the outer portion has a toothed rim and the outer portion is injection-molded onto the insert portion. The outer portion has a plurality of injection-molded sections formed on a side surface of the insert portion which surface is directed transversely or perpendicularly to the central longitudinal axis. To produce the gearwheel inexpensively and with sufficiently good physical properties as regards its load-bearing capacity and its useful life. The gearwheel is characterized in having injection-molded sections spaced apart from one another on the side surface of the insert portion and side surface areas of the insert portion are left free between directly adjacent injection-molded sections.