Ball Joint Bellow Seal Modular Assembly
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Solution Overview
Problem
Conventional ball joints for motor vehicles face challenges such as high production costs, complex assembly processes, and limited operational reliability due to the need for mechanical processing of the housing and the use of clamping rings for sealing, which increase assembly time and costs.
Innovation Solution
A modular ball joint design featuring a joint housing with a recess, a ball pivot, and a sealing bellows with a housing-side and pivot-side sealing seat, where the sealing bellows is attached to a retaining flange, allowing for a pre-assembled subassembly that simplifies the assembly process and reduces costs by eliminating the need for clamping devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clamping rings are used to fasten the sealing bellows to the housing and ball pivot, then sealing performance is improved, but production costs and assembly time increase
Solution Approach 1:
The invention extracts and eliminates the clamping rings from the sealing system. Instead of using separate clamping devices, the sealing bellows is directly integrated with the housing and ball pivot through form-fitting connections and friction forces, removing the unnecessary intermediary components while maintaining sealing effectiveness
Solution Approach 2:
The invention merges the sealing function with the structural components. The sealing bellows is combined with the housing and ball pivot into an integrated assembly where the sealing interface is formed by direct contact surfaces and friction forces, eliminating the need for separate clamping devices
2Strength
If roller burnishing is used to mechanically connect the joint shell to the housing, then mechanical separation force is improved, but assembly time and production costs increase
Solution Approach 1:
The invention applies preliminary action by pre-forming the joint shell with an integrated retaining flange structure during the molding process. This eliminates the need for subsequent roller burnishing operations, as the mechanical connection is already prepared in advance through the molded-in flange that engages with the housing
Solution Approach 2:
The invention replaces the mechanical roller burnishing system with a molded-in form-fitting connection. The retaining flange with its specific geometry creates the necessary mechanical separation force through geometric interlocking and friction, substituting the complex roller burnishing machinery with a simpler molded structure
3Reliability
If clamping devices are used to apply contact pressure for sealing, then sealing reliability is improved, but device complexity and cost increase
Solution Approach 1:
The invention applies self-service by designing the sealing system to generate its own contact pressure through the friction forces between the sealing bellows and the rotating ball pivot. The rotating motion automatically maintains the friction-based pressure, eliminating the need for external clamping devices to apply and maintain sealing pressure
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 significantly reduces assembly time and costs while ensuring high operational reliability through a simplified assembly process and effective sealing without the need for clamping rings, maintaining consistent contact pressure and structural integrity.
Implementation Method 1
Ball joints for motor vehicles are protected against the ingress of dirt and moisture and against the escape of joint grease by means of a sealing bellows or a sealing sleeve
Implementation Method 2
the ball head being accommodated in a pivoting manner within the joint socket
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a ball joint (1) comprising a joint housing (2) having a recess (4), a ball stud (6) with a ball head (8), a sealing bellows (42) with a housing-side sealing seat (43) and a stud-side sealing seat in the form of a bellows mouth (44) which is in contact with the ball stud (6), wherein a bellows body (60) of the sealing bellows (42) extends between the housing-side sealing seat (43) and the bellows mouth (44), and a joint shell (10), wherein the ball head (8) is pivotably received within the joint shell (10) and the joint shell (10) is inserted into the recess (4) of the joint housing (2).