Constant Velocity Joint Needle Bearing Assembly NVH Reduction
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Solution Overview
Problem
The existing constant velocity joints require a large number of needle bearings, leading to high manufacturing costs and poor noise, vibration, and harshness (NVH) characteristics due to numerous friction surfaces, which complicates the grinding process and increases the burden on cost.
Innovation Solution
The proposed constant velocity joint design reduces the number of needle bearings by incorporating needle bearing insert holes in spherical rollers and spider journals, with a larger inner diameter of the spherical rollers and hollow pipe-shaped needle bearings, and through-holes to minimize friction and grinding requirements, along with curved surfaces to shift contact points away from the center, thereby simplifying the manufacturing process and reducing friction surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If many needle bearings are used in the constant velocity joint, then the power transmission reliability is improved, but the manufacturing cost increases and the NVH characteristics deteriorate
Solution Approach 1:
The patent combines multiple needle bearings into a single integrated needle bearing assembly that supports multiple spherical rollers simultaneously. This merging approach maintains the power transmission reliability provided by multiple bearings while reducing the total number of separate bearing components, thereby lowering manufacturing complexity and cost.
Solution Approach 2:
The needle bearing assembly is designed to serve multiple functions: it supports multiple spherical rollers, accommodates varying operational angles, and provides power transmission across different conditions. This multi-functionality allows a single bearing assembly to replace what would traditionally require multiple separate bearings.
2Power
If many needle bearings and friction surfaces are used, then the power transmission capability is improved, but the grinding process complexity and manufacturing cost increase
Solution Approach 1:
By merging multiple needle bearings into a single integrated assembly with unified grinding surfaces, the patent reduces the number of separate grinding operations required. The combined structure allows for more efficient manufacturing while maintaining the power transmission capability that would otherwise require multiple separate bearings.
3Reliability
If many friction surfaces are used in the constant velocity joint, then the power transmission reliability is improved, but the noise, vibration, and harshness (NVH) characteristics deteriorate
Solution Approach 1:
The patent combines multiple friction surfaces into a unified needle bearing assembly structure, which reduces the number of separate friction interfaces. This merging approach maintains the reliability benefits of multiple contact points while reducing the cumulative noise, vibration, and harshness that would result from multiple separate friction surfaces.
Data Source
AI summary
A constant velocity joint includes a constant velocity joint housing with guide grooves on the inner side of the housing, a spider disposed in the constant velocity joint housing, combined with a shaft, and having a spider journal, and spherical rollers disposed in the guide grooves of the constant velocity joint housing. Needle bearings are disposed between the spherical rollers and the spider journals, in which a plurality of needle bearing insert holes is formed in the spherical rollers, and disposed in the needle bearing insert holes.