Suspension Arm Ball Joint Housing for Lightweight Mold Matching
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Solution Overview
Problem
Existing suspension arm manufacturing processes face challenges in reducing the weight of the housing while providing a matching surface for the mold, as increasing the radial thickness to form a matching surface complicates weight reduction.
Innovation Solution
A suspension arm design featuring a housing with a matching portion that protrudes radially outward, allowing contact with a mold without axial support from the arm body, combined with an insert molding process that reduces the housing's weight by using a thinner radial thickness and specific welding techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the radial thickness of the housing is increased to form a matching surface for the mold, then the matching surface can be provided, but the weight of the housing increases
Solution Approach 1:
The housing is divided into two functional regions: a matching portion with sufficient radial thickness that protrudes radially outward to contact the mold, and a lower portion with reduced radial thickness to minimize weight. This segmentation allows the housing to provide both the required matching surface and weight reduction simultaneously.
Solution Approach 2:
Different regions of the housing have different radial thicknesses optimized for their specific functions. The matching portion has greater radial thickness to ensure proper contact with the mold, while the lower portion has reduced radial thickness to reduce overall weight. This local differentiation resolves the contradiction between providing a matching surface and minimizing weight.
2Weight of moving object
If the radial thickness of the housing is reduced to decrease weight, then the weight of the housing decreases, but it becomes difficult to provide a matching surface for the mold
Solution Approach 1:
The housing is divided into two functional regions: a matching portion with sufficient radial thickness that protrudes radially outward to contact the mold, and a lower portion with reduced radial thickness to minimize weight. This segmentation allows the housing to provide both the required matching surface and weight reduction simultaneously.
Solution Approach 2:
The matching portion protrudes in the radial direction rather than extending axially, utilizing the radial dimension to provide the matching surface. This dimensional approach allows the housing to maintain adequate thickness for mold contact while keeping the overall axial length and weight reduced.
3Strength
If the matching portion is supported axially by the arm body, then structural support is provided, but axial forces are applied between the matching portion and arm body
Solution Approach 1:
The axial support function is extracted from the matching portion and transferred to dedicated welding surfaces on the outer peripheral surface of the housing. The matching portion is designed to contact the mold radially without axial support, eliminating axial forces between the matching portion and arm body while maintaining structural integrity through separate welding support.
Solution Approach 2:
The housing is segmented into a matching portion for radial mold contact and welding surfaces for axial structural support. This functional segmentation separates the radial loading path (through the matching portion) from the axial loading path (through the welding surfaces), preventing axial forces from being applied to the matching portion.
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
The solution effectively reduces the weight of the suspension arm by minimizing the housing's radial thickness while maintaining a matching surface for the mold, enhancing manufacturing efficiency and mechanical strength.
Implementation Method 1
an insert molding part which is injected to a lower portion of the bearing and the outer peripheral portion of the housing to be coupled to the bearing, the housing, and the arm body
Implementation Method 2
the welding between the housing and the arm body may be an arc welding which supplies heat necessary for the welding through an electric arc generated between a welding rod and a welding target portion
Data Source
AI summary
A suspension arm includes a ball stud including a spherical ball; a bearing in which the spherical ball is accommodated; a housing having an inner peripheral portion and an outer peripheral portion; an arm body coupled to the outer peripheral portion of the housing; and an insert molding part which is injected to a lower portion of the bearing and the outer peripheral portion of the housing to be coupled to the bearing, the housing, and the arm body. The housing includes a matching portion having a matching surface formed to protrude in a radially outward direction from an upper portion of the outer peripheral portion and to be brought into contact with a mold. By forming the matching portion, it is possible to reduce the volume of the housing and to reduce the weight of the suspension arm while providing the matching surface with the mold.