CV Joint Assembly Stops for Axial Roller Positioning
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Solution Overview
Problem
The existing constant velocity swivel joints face challenges during assembly, particularly when the inner joint part needs to be assembled into the outer joint part, as the rollers can pivot and outer rings are axially displaceable, making it difficult to achieve a defined assembly position without manual angle correction or axial displacement correction, which is impractical due to the number of rollers and space constraints.
Innovation Solution
The design incorporates internal and external displacement stops on the roller rings to limit axial displaceability, ensuring the rollers remain in place during assembly and operation, reducing the need for manual corrections and preventing the joint from falling apart at high articulation angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rollers are designed to be pivotable on the pivot pins and the outer rings are axially displaceable relative to the inner rings, then the constant velocity joint achieves low friction and vibration-free running, but the assembly position cannot be defined and manual correction becomes practically impossible
Solution Approach 1:
The patent applies preliminary action by pre-defining the assembly position through displacement stops that are integrated into the roller structure before assembly. The displacement stops on the outer ring and corresponding recesses on the inner ring establish a predetermined axial position, eliminating the need for manual correction during assembly while maintaining the dynamic bearing characteristics for low friction operation
Solution Approach 2:
The displacement stops and recesses act as intermediaries between the inner and outer rings, providing a mechanical reference that guides the assembly process. These features mediate the relationship between the movable outer ring and inner ring, ensuring proper positioning without requiring manual intervention while still allowing the necessary dynamic movement during operation
2Adaptability or versatility
If the outer ring is made significantly thicker than the inner ring to allow large axial displacement, then the dynamic bearing function is improved, but the assembly position definition becomes even more difficult
Solution Approach 1:
The displacement stops are designed as integral features of the outer ring structure, creating predetermined axial position references before assembly. This preliminary positioning feature allows the thick outer ring to maintain its axial displacement capability while providing built-in guidance for proper assembly positioning
Solution Approach 2:
The patent introduces radial features (displacement stops extending radially inward and recesses) to solve the axial positioning problem. By adding this radial dimension of control to the primarily axial movement system, the design enables position definition in the axial direction through radial structural features
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 simplifies the final assembly of the constant velocity swivel joint by limiting axial displaceability, reducing manual intervention, and enhancing wear resistance by minimizing friction, resulting in improved assembly efficiency and extended service life.
Implementation Method 1
A large number of rolling elements are arranged between the inner ring and the outer ring, so that the outer ring can roll on the inner ring
Implementation Method 2
a pivot pin of the inner joint part inserted into the inner ring causes a tilting movement in the inner ring
Implementation Method 3
an outer ring inserted into a path can carry out a linear displacement movement
Data Source
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AI summary
The invention relates to a CV joint with a joint outer piece (12), a joint inner piece (14) and rings (28) arranged between the joint outer piece (12) and joint inner piece (14). The rings (28) each have an inner ring (48) with a ring inner surface (54) and an outer ring (42) with a ring outer surface (56). A number of roller bodies (46) are arranged between the inner ring (48) and the outer ring (42), such that the outer ring (42) may roll over the inner ring (48). The invention is characterised in that the inner ring (48) forms an axial guide, fixing the position of the roller bodies (46) relative to the inner ring (48) in the axial direction. The invention is further characterised by an inner ring (48) and an outer ring (42), which have limited movement relative to each other in the axial direction.