Disc Clutch Separating Device for Drag Reduction
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Solution Overview
Problem
Disc clutches in transmissions experience significant heat generation and drag due to lubricated plates, leading to spin losses, as existing technologies fail to effectively manage these issues.
Innovation Solution
A disc clutch assembly with alternately spaced friction and reaction plates, utilizing flexible tabs or annular wave springs as separating devices that bias the plates apart, minimizing contact with friction material and reducing drag by engaging at low-friction areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If plates are closely spaced to transmit torque loads, then torque transfer capability is improved, but drag and spin losses increase due to continuous contact
Solution Approach 1:
The clutch assembly uses spring-loaded separating devices that dynamically adjust the spacing between friction plates and reaction plates. When torque is applied, the plates engage; when torque is released, springs push the plates apart. This dynamic separation eliminates continuous contact, reducing drag and spin losses while maintaining torque transfer capability when needed.
2Power
If friction material is applied to plates for torque transfer, then torque transmission is improved, but heat generation increases
Solution Approach 1:
The clutch assembly operates in periodic cycles of engagement and disengagement. During engagement, friction material transfers torque; during disengagement, separating devices push the plates apart, eliminating friction and heat generation. This periodic action allows torque transmission when needed while minimizing heat buildup through regular separation.
3Ease of operation
If separating devices contact friction material, then plate separation is achieved, but drag increases due to friction
Solution Approach 1:
The separating devices are designed to contact only the non-friction portions of the plates, specifically the metal surfaces at the inner circumference where no friction material is applied. This localized contact strategy enables effective plate separation while avoiding the high-friction friction material surfaces, thereby minimizing drag.
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
The solution significantly reduces drag and spin losses by separating the plates when not engaged, maintaining efficient torque transfer while minimizing contact and heat generation.
Implementation Method 1
separating devices may be flexible tabs integral with the friction plates that extend axially outward... or annular wave springs
Data Source
AI summary
A disc clutch assembly is provided that includes first and second sets of generally annular plates spaced alternately with one another. The plates of the first set have a friction interface. The first and second sets of plates are selectively engagable with one another at the friction interface for transferring torque loads. Separating devices are in contact with the plates radially inward of the friction interface. The separating devices are configured to bias the respective ones of the first and second sets of plates apart from one another when not selectively engaged.