CVT Clutch Duct Valve With Float Sealing for Water Ingress
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Solution Overview
Problem
Off-road vehicles' continuously variable transmission (CVT) clutch assemblies face heat generation and water ingress issues due to modifications and operating conditions, which can lead to slippage and damage, and existing cooling systems are inadequate in preventing water entry during wet environments.
Innovation Solution
A duct valve system for the CVT clutch assembly featuring floatable elements within valve cages that adjust to liquid levels, sealing air openings to prevent water ingress and maintain airflow for cooling, even when submerged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the inlet and exhaust openings of the cooling ducts are positioned above the engine assembly to prevent water entry, then water protection is improved, but cooling effectiveness deteriorates due to restricted airflow access
Solution Approach 1:
The patent employs float valves that dynamically adjust the opening state of duct openings based on water level. When water rises to a certain level, the float activates to close the opening, preventing water ingress. When water level drops, the opening automatically reopens to restore cooling airflow. This dynamic response resolves the contradiction by adapting the water protection level based on actual water threat rather than maintaining a fixed closed position.
Solution Approach 2:
The cooling duct system incorporates self-regulating float valves that automatically respond to water level changes without external control. The floats are positioned to naturally close openings when water reaches critical levels and reopen when safe, enabling the system to serve itself in managing both cooling and water protection needs without manual intervention or complex control systems.
2Temperature
If the duct openings are positioned to maximize cooling airflow, then cooling effectiveness is improved, but water ingress risk increases in wet operating environments
Solution Approach 1:
The float-controlled valve mechanism dynamically adjusts duct opening status based on real-time water level conditions. During normal operation with low water levels, openings remain fully open for maximum cooling airflow. When water levels rise to threaten the clutch assembly, the floats automatically close the openings to prevent water ingress, thus dynamically optimizing both cooling effectiveness and water protection based on environmental conditions.
Solution Approach 2:
The float acts as an intermediary element between the water environment and the cooling duct system. It translates water level information into valve actuation, serving as a simple yet effective mediator that protects the clutch assembly from water while allowing unrestricted cooling airflow when safe. This intermediary mechanism resolves the contradiction without requiring complex sensors or control systems.
3Object-affected harmful factors
If float valves are installed to prevent water entry, then water protection is improved, but device complexity increases due to additional components
Solution Approach 1:
The patent employs simple, inexpensive float valves as sacrificial protective elements. These floats are basic mechanical components with no moving parts other than their natural buoyancy-driven motion. If a float fails or becomes damaged, it can be easily replaced without affecting the core cooling duct system or clutch assembly. This approach provides robust water protection while minimizing complexity and cost, adhering to the principle of using simple, replaceable components for protective functions.
Solution Approach 2:
The water protection function is extracted from the main cooling duct system as a separate, independent float valve mechanism. This modular approach allows the float valves to be installed and adjusted independently without redesigning the entire cooling system. The extracted protective function can be easily maintained or replaced without impacting the core cooling functionality, thus improving water protection while managing overall system complexity.
4Object-affected harmful factors
If the clutch assembly is equipped with robust water sealing, then water protection is improved, but cooling airflow restriction increases
Solution Approach 1:
Instead of using fixed robust seals that permanently restrict airflow, the patent employs dynamic float-controlled valves that open freely during normal operation to maximize cooling airflow. Water protection is activated only when needed - when water levels rise to threaten the clutch assembly, the floats automatically close the openings. This dynamic approach provides robust water protection when required while maintaining unrestricted cooling airflow during normal operation, avoiding the trade-off inherent in fixed sealing solutions.
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 prevents water from entering the CVT clutch assembly while ensuring continuous airflow for cooling, protecting the components from damage and maintaining performance in wet conditions.
Implementation Method 1
The floatable element is configured to be displaced according to a liquid level when the clutch assembly is partially in a liquid medium
Data Source
AI summary
The present disclosure relates to a duct valve for a clutch assembly of an off-road vehicle. The duct valve is configured to be coupled to a housing of the clutch assembly. The duct valve comprises a first duct attached to the housing and a first valve cage attached to the first duct. The first valve cage is configured to hold a first floatable element therewithin. The first floatable element is configured to have a first buoyancy and is configured to displace towards a first air opening of the first duct corresponding to a level of a liquid to seal the first air opening.