Vibration Reduction Device Axial Size Inversion
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Solution Overview
Problem
Conventional vibration reduction devices increase in size due to the need for radial inside coupling, which limits their axial size reduction capabilities.
Innovation Solution
The vibration reduction device is configured with a damper portion and a dynamic vibration absorbing device, where the first output portion is coupled to the torque converter body on the radially outside, eliminating the need for radial inside coupling and allowing for axial size reduction, while the dynamic vibration absorbing device includes an inertia portion relatively movable with respect to the output portion to effectively absorb vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the second output portion is coupled to the output side member on the radially inside, then the vibration reduction device can be configured conventionally, but the axial size of the device increases
Solution Approach 1:
The patent inverts the conventional coupling arrangement by positioning both the first output portion and second output portion on the radially outside of the torque converter body, rather than having the second output portion on the radially inside. This inversion eliminates the need for axial space to accommodate radial inside coupling, thereby reducing the overall axial size of the vibration reduction device while maintaining functional effectiveness.
2Adaptability or versatility
If the first output portion and second output portion are formed separately, then the device can be assembled flexibly, but the number of parts increases
Solution Approach 1:
The patent merges the first output portion and second output portion into a single integrated component that is formed as one piece. This integration reduces the total number of parts in the vibration reduction device while maintaining the functional independence and assembly flexibility of the separate coupling points, as the integrated component can still be positioned and coupled separately to the torque converter body.
3Ease of operation
If the inertia portion is positioned on the radially inside, then the dynamic vibration absorbing device can be configured conventionally, but the axial size increases
Solution Approach 1:
The patent repositions the inertia portion from the conventional radially inside location to the radially outside location, utilizing the radial dimension more effectively. This dimensional reconfiguration allows the inertia portion to function as a dynamic vibration absorber without occupying axial space, thereby reducing the overall axial size of the device while maintaining the conventional operational configuration.
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 enables a reduction in the axial size of the vibration reduction device while maintaining effective vibration absorption and power transmission, thereby improving the device's compactness and performance.
Implementation Method 1
The damper portion (29) is configured to damp vibration inputted from the front cover (2)
Implementation Method 2
The inertia portion (51) is relatively movable with respect to the second output portion (50)
Data Source
AI summary
A lock-up device includes a damper portion and a dynamic damper device. The damper portion damps vibration inputted from a front cover. The damper portion includes a driven plate coupled to a turbine shell of a torque converter body on a radially outside side. The dynamic damper device absorbs vibration transmitted from the driven plate to the turbine shell. The dynamic damper device includes at least one damper plate portion. The damper plate portion is coupled to the turbine shell on a radially outside side.