Fluid Transmission Apparatus Vibration Damping
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Solution Overview
Problem
Conventional fluid transmission apparatuses experience reduced vibration damping effectiveness due to opposing phase vibrations from dynamic dampers and centrifugal pendulum vibration absorbers, leading to cancellation of damping effects.
Innovation Solution
The fluid transmission apparatus independently couples a dynamic damper and a centrifugal pendulum vibration absorber to the damper mechanism, with the dynamic damper engaged with either the intermediate or output element and the centrifugal pendulum absorber connected to the other element, preventing cancellation of damping effects and adjusting the resonance frequency to enhance vibration damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the elastic bodies of the dynamic damper are present upstream of the centrifugal pendulum vibration absorber, then the dynamic damper can damp vibrations, but the vibration damping effects of the dynamic damper and centrifugal pendulum vibration absorber cancel each other out
Solution Approach 1:
The patent segments the vibration damping system into two independent parallel paths: one path includes the dynamic damper connected to the intermediate element, and the other path includes the centrifugal pendulum vibration absorber connected to the output element. This segmentation prevents the phase opposition that occurs when components are arranged in series, allowing both damping mechanisms to work independently and effectively without canceling each other's effects.
2Device complexity
If the dynamic damper and centrifugal pendulum vibration absorber are connected in series, then the structure is simplified, but the vibration damping effects cancel each other due to opposite phases
Solution Approach 1:
The patent divides the damping system into two separate parallel branches: the dynamic damper branch connected to the intermediate element and the centrifugal pendulum vibration absorber branch connected to the output element. This segmentation maintains structural simplicity while eliminating the phase cancellation problem inherent in series connections, as each component operates independently on its own vibration path.
3Speed
If the resonance frequency of the damper mechanism is high, then the system responds faster, but vibrations at lower rotational speeds are not effectively damped
Solution Approach 1:
The patent modifies the resonance frequency parameter of the damper mechanism by changing its connection configuration. By connecting the dynamic damper to the intermediate element and the centrifugal pendulum vibration absorber to the output element, the system's resonance frequency is adjusted to a lower range, enabling effective vibration damping at lower rotational speeds while maintaining adequate response characteristics.
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 dampens vibrations transmitted to the input member by suppressing the cancellation of damping effects and shifting the resonance frequency to lower rotational speeds, improving power transmission efficiency and fuel economy.
Implementation Method 1
a first elastic body and a second elastic body; an intermediate element engaged with the input element via the first elastic body and an output element engaged with the intermediate element via the second elastic body
Implementation Method 2
a dynamic damper that includes a mass body and a third elastic body engaged with the mass body; the third elastic body of the dynamic damper is engaged with one of the intermediate element and output element
Implementation Method 3
a centrifugal pendulum vibration absorber that includes a support member and a plurality of mass bodies each oscillatable with respect to the support member
Data Source
AI summary
A fluid transmission apparatus including a pump impeller that is connected to an input member coupled to a motor; a turbine runner that is rotatable together with the pump impeller; a damper mechanism that includes an input element, an intermediate element engaged with the input element via a first elastic body and an output element engaged with the intermediate element via a second elastic body; a lock-up clutch mechanism; a dynamic damper that includes a mass body and a third elastic body engaged with the mass body; and a centrifugal pendulum vibration absorber that includes a support member and a plurality of mass bodies each oscillatable with respect to the support member. The third elastic body of the dynamic damper is engaged with one of the intermediate element and the output element. The centrifugal pendulum vibration absorber's support member is connected to the intermediate element or the output element.