Dynamic Vibration Absorbing Device for Torque Converter
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Solution Overview
Problem
Existing dynamic vibration absorbing devices struggle to effectively attenuate torque fluctuations in torque converters, particularly when the stiffness of the member coupled to the input shaft is low, leading to resonance issues and inadequate vibration reduction.
Innovation Solution
A dynamic vibration absorbing device comprising a rotary member, a mass part, and an elastic member, where the rotary member is fixed to the output-side member of the torque converter, and the mass part is coupled to the elastic member to generate a hysteresis torque through sliding, effectively reducing torque fluctuations by attenuating both principal and subsidiary vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a well-known dynamic damper is used to attenuate torque fluctuations, then torque fluctuations can be reduced when the member coupled to the input shaft has high stiffness, but the device becomes ineffective when the stiffness is low due to resonance frequency mismatch
Solution Approach 1:
The patent employs a dynamic damper with an inertia member that can rotate relative to the turbine hub, allowing the system to adapt its vibration attenuation characteristics. The inertia member's rotational movement creates a dynamic response that can handle both high-stiffness and low-stiffness conditions, resolving the contradiction between reliability and adaptability across different operating conditions.
Solution Approach 2:
The patent changes the parameters of the dynamic damper system by introducing an inertia member with specific moment of inertia and using elastic elements with adjustable stiffness. This allows the system to effectively attenuate torque fluctuations across a broader range of stiffness conditions, making the device adaptable to both high-stiffness (front-wheel drive) and low-stiffness (rear-wheel drive) applications.
2Reliability
If torsion springs are used to couple the inertia member to the output member, then the dynamic damper can attenuate torque fluctuations, but the device cannot effectively handle resonance issues when the coupled member has low stiffness
Solution Approach 1:
The patent uses the principle of mechanical vibration by employing an inertia member that rotates in response to torque fluctuations. The inertia member's rotational motion, combined with elastic elements, creates a vibration attenuation mechanism that can handle both principal torque fluctuations and resonance vibrations, effectively addressing the harmful resonance effects in low-stiffness conditions.
Solution Approach 2:
The patent introduces an inertia member as an intermediary element between the turbine and the output member. This inertia member, coupled through elastic elements, acts as a mediator that absorbs and attenuates both torque fluctuations and resonance vibrations, preventing the transmission of harmful vibrations to the output shaft while maintaining effective torque transmission.
3Reliability
If the inertia member is rotated relative to the rotary member through the elastic member, then torque fluctuations can be directly attenuated, but hysteresis torque is generated that may increase subsidiary vibrations
Solution Approach 1:
The patent converts the potentially harmful hysteresis torque generated by the elastic member into a beneficial damping effect. The hysteresis torque, while initially appearing as a harmful factor, actually provides additional damping that helps attenuate subsidiary vibrations and resonance, transforming it from a negative effect into a useful vibration control mechanism.
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 effectively reduces torque fluctuations in the output-side member of the torque converter, particularly in high rotational speed ranges, by generating a hysteresis torque that stabilizes and attenuates both primary and secondary vibrations, improving resonance inhibition and vibration control.
Implementation Method 1
The elastic member generates a hysteresis torque by sliding against the first accommodation part in rotation of the rotary member
Implementation Method 2
The elastic member generates a hysteresis torque by sliding against the first accommodation part in rotation of the rotary member
Implementation Method 3
The mass part attenuates vibration of the output-side member by rotating about the rotational center in relative to the rotary member
Data Source
AI summary
A dynamic vibration absorbing device for an automobile can be on an output-side member of a torque converter. The dynamic vibration absorbing device includes a rotary member, a mass part, and an elastic member. The rotary member is fixed to the output-side member. The rotary member can be rotated about a rotational center of the output-side member. The mass part includes a first accommodation part. The mass part is for attenuating vibration of the output-side member by rotating about the rotational center relative to the rotary member. The elastic member is held by the first accommodation part. The elastic member elastically couples the rotary member and the mass part in a rotational direction. The elastic member is for generating a hysteresis torque by sliding against the first accommodation part in rotation of the rotary member.