CV Joint Inner Ring Axial Guide for Roller Retention
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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 the 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 unfavorable space conditions.
Innovation Solution
The design includes an inner ring with a rest position that is mechanically fixed in a defined angular position, requiring a minimum torque to tilt, and features geometric structures such as plastic deformations or displacement stops to limit axial displaceability, ensuring the rollers remain securely positioned during assembly and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rollers are designed with pivot capability and axial displacement freedom, then the joint achieves low friction and vibration-free running, but the assembly position of the inner joint part cannot be defined, requiring manual correction
Solution Approach 1:
The patent applies preliminary action by pre-defining the rest position of the inner ring through mechanical structures (protrusions fitting into recesses, or elastic prestressing) before assembly. This ensures that when the inner joint part is assembled into the outer joint part, the rollers automatically assume a predetermined, correct position without requiring manual angle correction or axial displacement adjustment, thus resolving the contradiction between free-running properties and ease of assembly
2Adaptability or versatility
If the outer ring is made axially displaceable relative to the inner ring, then the joint accommodates articulation movements, but the rollers may fall apart at high articulation angles
Solution Approach 1:
The patent applies local quality by creating different functional zones within the roller structure. The inner ring has a rest position that is mechanically fixed for stable operation, while the outer ring maintains axial displaceability for articulation. The displacement stops are localized features that prevent excessive movement only when needed, allowing the joint to accommodate normal articulation movements while preventing roller disassembly at high articulation angles
3Ease of manufacture
If the inner ring is mechanically fixed in a defined angular position, then the assembly process is simplified, but a minimum torque is required to tilt the inner ring
Solution Approach 1:
The mechanical fixation of the inner ring in a defined angular position through protrusions and recesses serves as a preliminary action that establishes the correct assembly position before operation. The minimum torque requirement is acceptable because it only needs to be overcome during the assembly process to engage the protrusions into the recesses, after which the joint operates normally without continuous torque application
Solution Approach 2:
The patent applies parameter changes by using elastic prestressing to create a rest position. The elastic elements store energy that maintains the inner ring in a predetermined angular position during assembly, simplifying the assembly process. During normal operation, the joint accommodates torque variations while the elastic elements continue to provide positioning stability
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 solution simplifies the final assembly of the constant velocity swivel joint by reducing the need for manual position corrections and preventing the rollers from falling apart, even at high articulation angles, while minimizing friction and wear, thus enhancing the assembly process and operational reliability.
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
The construction known from DE 103 25 116 A1 realizes special advantages in terms of low friction and vibration-free running of the constant velocity joint
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.