Variable Hysteresis Damper for Stopper Shock and Drivability
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Solution Overview
Problem
Existing damper devices for hybrid vehicles often suffer from damage or breakage of components due to frequent activation of the stopper mechanism and application of large shocks during engine starting, which impairs drivability, especially when large-amplitude torsional vibrations are encountered.
Innovation Solution
A damper device with a friction control mechanism that dynamically activates and deactivates hysteresis torque generation based on torsional angles, preventing stopper mechanism activation and shock application by generating hysteresis torque only when necessary, thereby enhancing drivability and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only a small hysteresis torque is constantly generated in the positive-side torsional region, then small-amplitude torsional vibration can be effectively attenuated, but the stopper mechanism becomes likely to be damaged or broken due to frequent activation and large shocks
Solution Approach 1:
The patent applies dynamics by making the hysteresis torque generation variable rather than constant. The friction control mechanism dynamically adjusts the hysteresis torque based on the torsional angle: generating large hysteresis torque when the torsional angle is within the first angular range (preventing stopper activation), and generating small hysteresis torque when the torsional angle is outside this range (maintaining drivability). This dynamic adjustment resolves the contradiction between stopper durability and drivability.
2Ease of operation
If only a small hysteresis torque is generated in the positive-side torsional region, then drivability is maintained, but large shocks are applied to the contacted portions during relative rotation across the neutral position
Solution Approach 1:
The patent applies preliminary anti-action by generating large hysteresis torque in advance when the torsional angle is within the first angular range. This pre-applied torque prevents the relative rotation from reaching positions where large shocks would occur during direction changes across the neutral position. The friction control mechanism anticipates potential shock conditions and counteracts them before they occur, while maintaining drivability through small hysteresis torque when conditions are normal.
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 effectively inhibits damage to components and maintains drivability even under large-amplitude torsional vibrations by controlling hysteresis torque generation, reducing shock to the stopper mechanism and enhancing vibration attenuation.
Implementation Method 1
a friction mechanism that generates a hysteresis torque in relative rotation between the input-side rotor and the output-side rotor
Implementation Method 2
a damper part that elastically couples the input-side rotor and the output-side rotor in a rotational direction
Data Source
AI summary
The present damper device includes a large hysteresis mechanism, generating a large hysteresis torque, and a hysteresis inhibiting mechanism. In a positive-side torsional region, when relative rotation is performed until reaching a maximum torsion angle from a neutral position, the hysteresis inhibiting mechanism deactivates the large hysteresis mechanism until the relative rotation reaches a first torsion angle from the neutral position, but activates the large hysteresis mechanism until the relative rotation reaches the maximum torsion angle from the first torsion angle; and when the relative rotation is performed until reaching the neutral position from the maximum torsion angle, the hysteresis inhibiting mechanism deactivates the large hysteresis mechanism until the relative rotation reaches a second torsion angle less than the first torsion angle from the maximum torsion angle, but activates the large hysteresis mechanism until the relative rotation reaches the neutral position from the second torsion angle.