Radial Ball Joint Upper Bearing Shell Lubrication Grooves
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Solution Overview
Problem
Radial ball joints for vehicles face challenges in maintaining effective lubricant supply between the upper bearing shell and the joint ball, leading to potential wear and friction issues during rotational and pivoting movements.
Innovation Solution
Incorporating annular, circumferentially closed upper bearing shells with lubrication grooves that pass through the wall in an embossment process, ensuring uniform lubricant distribution and wear resistance, combined with case-hardened steel for enhanced durability and low friction sliding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the upper bearing shell is made as a simple drawn component without lubrication grooves, then the manufacturing process is simple and cost-effective, but the lubricant supply to the contact zone is insufficient leading to wear and friction issues
Solution Approach 1:
The upper bearing shell is designed with lubrication grooves that pass through its wall, creating a structured pathway for lubricant distribution. This approach类似于using porous materials by creating controlled channels within the component structure to enable effective lubricant supply to the contact zone between the bearing shell and joint ball
Solution Approach 2:
The bearing shell wall is segmented into multiple lubrication grooves that distribute lubricant across different areas of the contact zone. This segmentation of the wall structure allows systematic lubricant delivery to multiple contact points, improving overall lubrication effectiveness without requiring a completely complex design
2Weight of moving object
If the upper bearing shell wall is made thin to reduce weight, then the component is lighter and more efficient, but the wall becomes too weak to maintain structural integrity under load
Solution Approach 1:
The bearing shell exhibits local quality variations through strategically placed lubrication grooves and case-hardened surface layers. The wall thickness and material properties are optimized locally - thinner in non-critical areas to reduce weight, while maintaining sufficient strength in load-bearing regions through case hardening and appropriate groove placement that does not compromise structural integrity
3Reliability
If case hardening is applied to the upper bearing shell, then wear resistance and durability are improved, but the manufacturing process becomes more complex and time-consuming
Solution Approach 1:
Case hardening modifies the material parameters of the upper bearing shell by creating a hard surface layer with different properties than the core material. This parameter change in surface hardness and composition provides enhanced wear resistance and durability for the contact zone, while the core material remains ductile and easier to manufacture
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 provides effective lubricant supply and distribution, reduces wear and friction, and enhances the radial ball joint's durability and performance under various loads, including impact loads, while maintaining a stable and quiet operation.
Implementation Method 1
the upper bearing shell is in the form of an annular, circumferentially closed drawn component having a plurality of lubrication grooves in the contact zone with the joint ball, which grooves pass through a wall of the upper bearing shell in the manner of an embossment
Implementation Method 2
case-hardened steel for enhanced durability and low friction sliding
Implementation Method 3
which grooves pass through a wall of the upper bearing shell in the manner of an embossment
Data Source
AI summary
A radial ball joint (1, 50, 70) for a vehicle having a housing (2, 51) for holding a joint ball (11) of a ball stud (6) so that the ball stud can rotate and pivot. An upper bearing shell (7), made from a steel sheet, is arranged between an inside wall (10) of the housing (2, 51) and the joint ball (11). The upper bearing shell (7) is in contact with the joint ball (11) over a contact zone (21) to provide the joint ball (11) with a circumferential slide bearing between its equator (12) and its upper pole (13). The upper bearing shell (7) is in the form of an annular, circumferentially closed drawn component and has in the contact zone (21) with the joint ball (11). A number of lubrication grooves (14), pass through a wall (20) of the upper bearing shell (7), in an embossment manner.