Damper Friction Layout for Stable Hysteresis Torque
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Solution Overview
Problem
Existing damper devices face issues with durability and consistency in hysteresis torque generation due to the expansion and contraction of disk springs, leading to variable pressing forces and increased axial length, which affects the reliability of torque absorption.
Innovation Solution
A damper device configuration featuring a first and second rotary body, a control plate, and thrust members with a biasing member that generates independent frictional forces, allowing for compact axial length and stable hysteresis torque generation by separating the locations of frictional force generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pressing force from the disk spring is varied corresponding to the magnitude of twist angle, then the hysteresis torque is varied to handle variable torque fluctuation, but the axial length of the hysteresis portion becomes large
Solution Approach 1:
The hysteresis portion is segmented into multiple independent friction generating locations: between the thrust member and control plate, and between the control plate and first plate. This segmentation allows each location to contribute to hysteresis torque independently, eliminating the need for large axial expansion and contraction of a single disk spring while still achieving variable hysteresis torque characteristics.
Solution Approach 2:
The invention transitions from a single axial dimension friction mechanism to a multi-location friction mechanism that operates in different spatial relationships. The control plate can rotate integrally with either the first or second rotary body, creating friction at different locations and orientations, thereby achieving variable hysteresis torque without increasing axial length.
2Productivity
If the disk spring expands and contracts at all twist angles of relative rotation, then the expansion and contraction frequency increases, but the characteristics of the disk spring change due to durability issues and desired hysteresis torque is less likely to be exhibited
Solution Approach 1:
The control plate is designed to dynamically switch its rotational engagement - it can rotate integrally with the first rotary body at certain twist angles and with the second rotary body at other twist angles. This dynamic engagement pattern reduces the frequency of disk spring expansion and contraction while maintaining effective hysteresis torque generation across the full range of relative rotation.
Solution Approach 2:
The frictional force generation occurs periodically at different locations based on the twist angle. The control plate alternates between engaging with the first rotary body and the second rotary body, creating a periodic action pattern that reduces continuous disk spring cycling while maintaining consistent hysteresis torque characteristics over time.
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 enables stable and compact hysteresis torque generation across various twist angles, enhancing durability and torque absorption efficiency while maintaining a compact axial length.
Implementation Method 1
a first frictional force between the first thrust member and the control plate
Implementation Method 2
generate a first frictional force between the first thrust member and the control plate
Implementation Method 3
abuts against and slides on the first plate in the specific state to generate a second frictional force between the control plate and the first plate
Data Source
AI summary
A damper device includes: a first rotary body including a first plate rotating around a rotation shaft and a second plate disposed facing the first plate and integrally rotating with the first plate; a second rotary body rotating relative to the first rotary body; a control plate disposed between the first plate and the second rotary body in an axial direction and engaged with the second rotary body to rotate integrally therewith; a first thrust member a part of which is disposed between the first plate and the control plate in the axial direction and engaged with the first plate to rotate integrally therewith; and a second thrust member a part of which is disposed between the second plate and the second rotary body and engaged with the second plate to rotate integrally with the first rotary body.