Torsional Damper Spring Guides for Centrifugal Hysteresis Control
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Solution Overview
Problem
Existing torsional vibration reduction apparatuses in vehicle transmissions experience increased hysteresis torque due to centrifugal forces, leading to noise issues and reduced damping performance, especially when the lock up clutch is operated from a low rotation region, and current solutions either restrict layout or require additional costly components.
Innovation Solution
The apparatus features input and output member side spring receiving portions with guide portions that allow for controlled sliding of coil springs under centrifugal force, reducing radial displacement and hysteresis torque without additional components, by using guide portions with varying protrusion heights and inclined surfaces to manage torsional vibration in both forward and reverse rotations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coil springs are disposed between input and output members to reduce torsional vibration, then damping performance is improved, but hysteresis torque increases due to centrifugal force causing radial displacement and sliding
Solution Approach 1:
The spring receiving portion is divided into multiple functional zones: a first spring pedestal for primary load bearing, a second spring pedestal for additional support, and guide portions with varying protrusion heights to control radial displacement at different locations. This segmentation allows the system to maintain damping functionality while controlling hysteresis through localized geometric features.
Solution Approach 2:
The guide portions have different protrusion heights at different locations along the coil spring, creating local variations in radial constraint. The higher protrusion heights are positioned where centrifugal force causes maximum radial displacement, providing localized control to reduce sliding and hysteresis torque while maintaining overall damping performance.
2Object-generated harmful factors
If additional components are added to suppress radial displacement of coil springs, then hysteresis torque is reduced, but device complexity and manufacturing cost increase
Solution Approach 1:
The spring receiving portion structure serves multiple functions: it provides radial guidance to reduce hysteresis, supports the coil spring during torsional vibration damping, and incorporates guide portions that control radial displacement. By integrating these functions into a single structural component rather than adding separate guidance mechanisms, the invention reduces device complexity while effectively controlling hysteresis torque.
Solution Approach 2:
The varying protrusion heights of the guide portions are formed directly as integral features of the spring receiving portion structure, eliminating the need for additional separate components. The structure guides and constrains the coil spring through its own geometric features, making the system self-sufficient and reducing manufacturing complexity.
3Object-generated harmful factors
If coil springs are constrained to prevent radial outward movement under centrifugal force, then hysteresis is reduced, but layout flexibility is restricted
Solution Approach 1:
The guide portions are designed with varying protrusion heights that dynamically adapt to the coil spring's position during operation. The different heights allow the structure to accommodate radial displacement variations while maintaining guidance, enabling the system to adapt to different operational conditions without restricting layout flexibility or requiring additional components.
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 configuration effectively reduces hysteresis torque and associated noise, enhancing damping performance while maintaining layout flexibility and avoiding the need for additional components, thus improving fuel efficiency and reducing uncomfortable vehicle vibrations.
Implementation Method 1
The torsional vibration between the input member and the output member occurs elastic deformation of the coil springs depending on the magnitude of a torsional amplification between the input and output spring pedestals
Implementation Method 2
under the circumstance that the input and output members rotate with high speed, centrifugal force displaces the coil springs in a radial outward direction
Data Source
AI summary
A torsional vibration reduction apparatus has coil springs. The coil springs are received in paired input member side coil spring receiving portions and an output member side coil spring receiving portion. The paired input member side coil spring receiving portions comprise forward rotation side and reverse rotation side guide portions between forward rotation side and reverse rotation side spring pedestals. The output member side coil spring receiving portion comprises forward rotation side and reverse rotation side guide portions between forward rotation side and reverse rotation side spring pedestals. In forward rotation and reverse rotation, since the displacement of the coil springs under the centrifugal force is received by the guide portions and the vertical component force of the elastic force is small, sliding resistance is suppressed, the hysteresis torque is reduced, additive components are not required, and the installation positions of the coil springs cannot be restricted.