CV Joint Vent Seal Assembly for Overheating and Contamination
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Solution Overview
Problem
Constant velocity joints in vehicle driveline systems face challenges with contamination and overheating, as venting to prevent overheating can allow debris and lubricant expulsion, leading to false alerts and a dirty underbody.
Innovation Solution
A vent and seal assembly within the constant velocity joint that includes a series of venting cavities, allowing air to escape while preventing contaminants and excessive lubricant egress, using a one-way valve to control pressure equalization and grease exit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the CV joint is vented to atmosphere to prevent overheating, then temperature control is improved, but contaminants can enter the internal cavity and lubricant can be expelled
Solution Approach 1:
A vent assembly acts as an intermediary component between the internal cavity and atmosphere. The vent assembly includes a vent cavity with a vent opening that allows air to pass through, and a seal member that selectively blocks contaminants while permitting lubricant to pass. This intermediary structure resolves the contradiction by mediating between the need for ventilation and the need for contamination protection.
Solution Approach 2:
The vent assembly creates different functional zones with different properties. The vent cavity provides a controlled local environment where air can be vented, while the seal member creates a selective barrier zone that allows lubricant passage but blocks contaminants. This local differentiation of properties resolves the contradiction by allowing different functions in different zones.
2Temperature
If the CV joint is vented to atmosphere to prevent overheating, then temperature control is improved, but lubricant can be expelled onto the underbody
Solution Approach 1:
The seal member acts as an intermediary that selectively filters substances passing through the vent assembly. It allows air and excess lubricant to pass through the vent opening while blocking contaminants. The seal member's selective permeability resolves the contradiction by mediating substance passage based on material properties.
Solution Approach 2:
The seal member functions as a porous or permeable barrier that allows certain substances (air and lubricant) to pass through while blocking others (contaminants). This selective permeability based on material properties resolves the contradiction by allowing necessary ventilation while preventing harmful substance ingress and unnecessary lubricant loss.
3Object-affected harmful factors
If seal members are added to prevent contaminant ingress, then contamination protection is improved, but lubricant cannot be expelled when needed for pressure equalization
Solution Approach 1:
The seal member provides dynamic sealing that adapts to different operating conditions. During normal operation, it maintains a sealed state to prevent contaminant ingress. During pressure equalization events, it allows lubricant passage. This dynamic behavior resolves the contradiction by adapting sealing properties based on operational needs.
Solution Approach 2:
The seal member's effective permeability changes based on pressure differential and substance type. It maintains high resistance to contaminant ingress under normal conditions but allows lubricant passage when pressure equalization is needed. This parameter change resolves the contradiction by dynamically adjusting sealing effectiveness based on operational parameters.
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
Effectively vents air from the internal cavity, preventing overheating while minimizing lubricant loss and contamination ingress, maintaining the joint's functionality and cleanliness.
Implementation Method 1
allowing air to escape while preventing contaminants and excessive lubricant egress, using a one-way valve to control pressure equalization
Implementation Method 2
using a one-way valve to control pressure equalization and grease exit
Data Source
AI summary
A multi-piece propeller shaft includes a constant velocity joint disposed between and operably interconnecting first and second shaft segments. The constant velocity joint includes an outer race extending along an axis A from a first outer race end operably connected to the second shaft segment to a second outer race end to define an inner surface bounding an internal cavity. A vent and seal assembly is disposed inside the outer race and defines a plurality of venting cavities disposed serially along the axis A in fluid communication with one another. A first one of the venting cavities is disposed in fluid communication with the internal cavity and a last one of the venting cavities is disposed in fluid communication with an environment of the constant velocity joint for venting air from the internal cavity to the environment.