CV Joint Vent Channel Layout for Pressure Relief Without Boot Deformation
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Solution Overview
Problem
Existing constant velocity joint (CV joint) venting systems are complex, prone to deformation, and increase manufacturing costs due to the use of multiple components and thin cross-sections, which can lead to blocked vent channels and reduced durability.
Innovation Solution
A CV joint with a simplified venting system featuring a single continuous channel that provides direct fluid communication between the chamber and the environment, formed by axially displaced grooves on the boot assembly and the shaft, reducing complexity and maintaining boot thickness, thereby minimizing deformation and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex combinations of vent channels are formed in the boot, then pressure venting capability is improved, but manufacturing difficulty increases and the boot becomes prone to deformation
Solution Approach 1:
The venting system is segmented into two separate components: the boot and the boot sleeve. The boot contains axial grooves while the boot sleeve contains circumferential grooves. This segmentation allows each component to have simpler, more manufacturable groove configurations while collectively providing effective pressure venting through their cooperation.
2Reliability
If thin cross-sections of the boot are created by vent channels, then pressure venting is enabled, but the boot becomes prone to deformation under compression
Solution Approach 1:
The venting function is segmented between the boot and boot sleeve, allowing the boot to maintain thicker cross-sections for strength while the boot sleeve provides additional venting pathways. This distributes the structural load and prevents localized thinning that would compromise boot rigidity.
Solution Approach 2:
The boot sleeve acts as an intermediary component that provides additional venting capability without requiring the boot itself to have complex or thin-walled structures. The boot sleeve mediates the venting function while preserving the boot's structural integrity.
3Stability of the object's composition
If axial grooves on the boot cooperate with circumferential groove on boot sleeve, then vent path rigidity is improved, but assembly complexity and manufacturing cost increase
Solution Approach 1:
The venting system is divided into two functional segments: axial grooves in the boot for primary venting and circumferential grooves in the boot sleeve for secondary venting and structural support. This segmentation provides rigidity through the boot sleeve while maintaining relatively simple groove configurations in both components.
Solution Approach 2:
The boot sleeve serves multiple functions: it provides structural support to maintain vent path rigidity, offers additional pressure venting through its circumferential grooves, and acts as a retaining element. This multi-functionality achieves rigidity without proportionally increasing complexity.
Data Source
AI summary
A constant velocity joint includes a shaft and an inner race coupled to the shaft. The inner race has a shaft groove formed thereon. A boot assembly engages the shaft and covers the inner race. A pair of grooves is axially formed in the boot assembly. The shaft groove provides communication between the pair of grooves.