Torque Limiting Device Flywheel Integration
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Solution Overview
Problem
Conventional torque limiting devices face challenges in achieving high torque limitation while maintaining stability and wear resistance, due to insufficient stiffness and uneven contact pressure distribution, leading to potential damage from excessive torque and uneven wear on friction facings.
Innovation Solution
A torque limiting device with a clutch disc clamp plate that forms a concave space with the flywheel, utilizing an elastic member to distribute contact pressure uniformly and enhance stiffness, along with a tapered design to prevent uneven wear, and adjustable shims for precise torque control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional clutch mechanism with thick pressing plates and integrated release mechanism is used, then torque limitation function is achieved, but axial length becomes great and mounting becomes difficult
Solution Approach 1:
The pressing plates are merged with the flywheel by forming recesses directly in the flywheel structure. The first pressing plate becomes the first surface of the flywheel, and the second pressing plate becomes the second surface, eliminating separate thick plate components and reducing overall axial length while maintaining torque limitation function
Solution Approach 2:
The flywheel serves multiple functions: it stores rotational energy, provides the pressing surface for torque limitation, and incorporates the recesses that house the elastic members. This multi-functionality eliminates the need for separate dedicated pressing plate components
2Device complexity
If a ring-shaped pressing plate fixed by rivets and bolts is used, then structure is simplified, but stiffness becomes insufficient for high torque limitation
Solution Approach 1:
The pressing plates are formed as integral surfaces of the flywheel structure, creating a composite rigid structure that combines the flywheel material properties with the pressing surface geometry. This provides the necessary stiffness for high torque limitation applications
Solution Approach 2:
The pressing plates are designed with curved surfaces that conform to the rotational motion and load distribution patterns, optimizing stress distribution and enhancing stiffness under rotational loads
3Force
If a cone spring providing line-contact pressure is used, then pre-compression is achieved, but contact pressure distribution becomes uneven causing unstable torque limitation and uneven wear
Solution Approach 1:
Multiple elastic members are distributed uniformly around the clutch disc to provide homogeneous contact pressure distribution across the friction facings. This eliminates the line-contact concentration and achieves uniform pressure distribution for stable torque limitation
Solution Approach 2:
The single cone spring is segmented into multiple discrete elastic members (coil springs or disc springs) distributed around the clutch assembly. Each spring provides localized compression, and their combined effect creates uniform overall pressure distribution
4Reliability
If thick pressing plates are used for torque limitation, then torque control is achieved, but axial space is consumed and mounting becomes difficult
Solution Approach 1:
The elastic members are nested within recesses formed in the flywheel structure. The first and second elastic members are positioned in separate recesses that are integrated into the flywheel body, allowing compact arrangement and reducing axial space requirements
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 device achieves enhanced torque transfer capability, stability, and wear resistance, allowing for effective torque limitation without compromising performance, and facilitates easier mounting on vehicles by reducing axial length.
Implementation Method 1
at least one pressing means that is an elastic member fitted to and in the flywheel for pressing the clutch pressing plate so that the contact pressure on the surface of the clutch pressing plate is uniformly distributed
Implementation Method 2
a clutch disc that is held between the fly wheel and the clutch disc clamp plate by use of the pressing force of the pressing means
Data Source
AI summary
A torque limiting device includes: a clutch disc clamp plate 17 having a surface area 13 where the surface and the outer area surface of the flywheel press or come in contact with each other, and is provided with an opening 16 at the center middle part of the clutch disc clamp plate 17 so that a concave space 14 is formed between the clutch disc clamp plate 17 and the fly wheel 2 when the clutch disc clamp plate 17 is fastened to the fly wheel 2; a clutch disc 18 fitted in the concave space, and connected to the driven apparatus; a clutch pressing plate 22 fitted between the clutch disc 18 and the fly wheel 2; and, at least one pressing means fitted to and in the flywheel 2 and presses the clutch pressing plate 22 in a surface contact condition.