CVT Intake Fan Layout for Cooling Enclosed Clutch Assemblies
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Solution Overview
Problem
Continuously variable transmissions (CVTs) in off-road vehicles face heat management issues due to enclosed components, leading to degradation and reduced lifespan, especially in higher horsepower vehicles where heat generation is greater.
Innovation Solution
The design incorporates an air induction cooling system with a housing comprising an inner and outer cover, featuring a clutch assembly with a separate and independent intake fan mounted on the clutch post, allowing for effective airflow and heat dissipation by drawing ambient air into the interior chamber and circulating it to cool the primary and secondary clutch assemblies and drive belt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the CVT components are enclosed in a housing to protect from environment, then protection from dust/water/mud is improved, but heat dissipation deteriorates causing component degradation
Solution Approach 1:
The housing is segmented into inner and outer covers with strategically placed openings. The inner cover encloses the clutch assemblies while the outer cover provides additional protection. Airflow openings in both covers create channels for heat dissipation without compromising the protective enclosure, allowing segmented protection while enabling thermal management.
Solution Approach 2:
An intake fan is introduced as an intermediary component to actively manage airflow between the enclosed components and the external environment. The fan creates controlled air circulation that removes heat from the clutch assemblies and drive belt while maintaining the protective housing structure, serving as a mediator between the enclosed hot components and the cooler external air.
2Temperature
If a fan is integrated into the sheave to cool components, then cooling function is achieved, but the fan size is limited and requires integral formation
Solution Approach 1:
The fan is segmented from the sheave assembly and mounted independently on the clutch post. This separation allows the fan to be designed and manufactured as a standalone component with optimal size and geometry, rather than being constrained by the sheave's structural requirements. The independent mounting simplifies assembly and maintenance while achieving effective cooling.
Solution Approach 2:
The fan function is extracted from the sheave structure and placed on the clutch post instead. This extraction removes the constraint of integral formation, allowing the fan to be a separate, replaceable component that can be optimized for cooling performance without affecting the sheave's mechanical function. The clutch post serves as a convenient mounting location that provides direct access to the heat-generating components.
3Device complexity
If the fan is mounted on the clutch post separate from the sheave, then fan size and independence are improved, but mounting complexity increases
Solution Approach 1:
The fan mounting structure is merged with the clutch post assembly, utilizing existing structural elements of the clutch post for fan support. This integration reduces the need for separate mounting brackets or complex fastening mechanisms, as the clutch post itself provides the mounting function. The combined design simplifies manufacturing while maintaining fan independence from the sheave.
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 enhances the cooling efficiency of CVT components, reducing heat-related degradation and extending the lifespan of CVT parts in off-road vehicles by utilizing airflow to extract heat and circulate cool air, thereby improving the overall performance and reliability of the transmission.
Implementation Method 1
an air induction cooling system with a housing comprising an inner and outer cover, featuring a clutch assembly with a separate and independent intake fan mounted on the clutch post, allowing for effective airflow and heat dissipation by drawing ambient air into the interior chamber and circulating it to cool the primary and secondary clutch assemblies and drive belt
Data Source
AI summary
A continuously variable transmission (CVT), wherein the CVT includes a housing having an inner cover and an outer cover connected to the inner cover to provide the housing having an interior chamber defined therein. The CVT additionally comprises a clutch assembly disposed within the housing interior chamber, wherein the clutch assembly comprises a clutch post that is connectable to an output shaft of a vehicle prime mover, a movable sheave movably mounted on the clutch post, and a stationary sheave fixedly mounted on the clutch post opposite a front face of the movable sheave. The clutch assembly additionally comprises an intake fan fixedly mounted to the clutch post opposite a rear face of the movable sheave such that the intake fan is separate, independent and spaced apart from the movable sheave.