Pre-Compressed Rotor Damper Coupling for Collision Sound Control
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Solution Overview
Problem
Hybrid vehicles experience sound production due to relative rotation between damper device rotors during engine start and torque fluctuations, which existing damper devices fail to adequately mitigate.
Innovation Solution
A damper device with an elastic coupling system comprising first and second elastic members that transition between compressed and free states to manage torsional torque, minimizing relative rotation and inhibiting sound production across both positive and negative torsional ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the damper device uses a conventional elastic coupling system, then it can provide torsional flexibility, but collision sound is produced during torque fluctuations due to relative rotation between rotors
Solution Approach 1:
The elastic members are pre-compressed to a predetermined extent before operation, creating preliminary torsional torques that counteract fluctuating input torques. This preliminary action maintains the rotors in a neutral rotational position, preventing relative rotation and collision sound during torque fluctuations.
Solution Approach 2:
The invention changes the initial state parameter of the elastic members from a relaxed or partially compressed state to a specifically predetermined compressed state. This parameter change creates balanced preliminary torsional torques that actively counteract torque fluctuations, eliminating the relative rotation between rotors that causes collision sound.
2Reliability
If the damper device limits torque transmission to prevent excessive torque, then it protects the engine, but sound is produced during engine start and torque fluctuations
Solution Approach 1:
The elastic members are pre-compressed to establish preliminary torsional torques before torque fluctuations occur. This preliminary action enables the system to absorb and counteract fluctuating torques without allowing significant relative rotation between rotors, thereby preventing collision sound while maintaining torque limiting functionality.
Solution Approach 2:
The pre-compressed elastic members act as intermediaries between the first and second rotors, mediating the torque transmission. They provide a cushioning effect that limits excessive torque while minimizing relative rotation, thus protecting the engine without producing collision sound during normal operation.
3Adaptability or versatility
If the damper device allows relative rotation between rotors to accommodate torque fluctuations, then it provides torsional compliance, but collision sound is generated between members
Solution Approach 1:
The elastic members are pre-compressed to create preliminary torsional torques that actively counteract fluctuating input torques. This maintains the rotors in neutral alignment throughout torque fluctuations, providing torsional compliance through the elastic deformation of pre-compressed members rather than through relative rotation, thereby eliminating collision sound.
Solution Approach 2:
The invention changes the operational mode from relative rotation to elastic deformation of pre-compressed members. By adjusting the initial compression parameter of the elastic members, the system achieves torsional compliance through controlled elastic deformation while maintaining fixed rotor alignment, preventing collision sound.
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 reduces the angle of torsion between rotors, thereby inhibiting collision sound during torque fluctuations, ensuring quiet operation by balancing torsional torque across a predetermined range.
Implementation Method 1
an elastic coupling part which elastically couples the first rotor and the second rotor... includes a first elastic member and a second elastic member... The first elastic member transitions from the compressed state to a free state and is then further compressed when the torsion of the first rotor with respect to the second rotor is caused
Data Source
AI summary
A damper device includes a first rotor, a second rotor, and an elastic coupling part elastically coupling the first and second rotors in a rotational direction. The elastic coupling part includes first and second elastic members that are each initially disposed in a compressed state in a neutral condition without relative rotation between the first rotor and the second rotor. The first elastic member is transitioned from the compressed state to a free state and then further compressed when torsion of the first rotor with respect to the second rotor is caused from the neutral condition to a first side in the rotational direction. The second elastic member is transitioned from the compressed state to the free state and then further compressed when the torsion of the first rotor with respect to the second rotor is caused from the neutral condition to a second side in the rotational direction.