Damper Device Circumferential Dynamic Damper Layout
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Solution Overview
Problem
Conventional damper devices with a dynamic damper's third elastic body disposed at a different radial position from the first and second elastic bodies increase the outside diameter, making the device less compact and leading to excessive rigidity, which affects damping performance.
Innovation Solution
The damper device incorporates a dynamic damper with a third elastic body positioned next to the outer elastic body in the circumferential direction, overlapping it in both axial and radial directions, and includes an intermediate element to transmit power, reducing the overall diameter and rigidity, and improving damping performance by ensuring proper resonance frequency alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the third elastic body of the dynamic damper is disposed radially outward or inward of the first and second elastic bodies, then the dynamic damper can be implemented, but the outside diameter of the damper device is increased
Solution Approach 1:
The third elastic body is repositioned from a radial arrangement to a circumferential arrangement, overlapping the outer elastic body in both axial and radial directions. This dimensional change allows the dynamic damper to function without increasing the outside diameter of the damper device.
Solution Approach 2:
The third elastic body is positioned to overlap the outer elastic body, creating a nested configuration where the mass body of the dynamic damper is disposed inward of the outer elastic body. This nesting approach allows multiple elastic bodies to occupy the same radial space, preventing outside diameter increase.
2Reliability
If the third elastic body is disposed between the outer elastic body and the inner elastic body in the radial direction, then the dynamic damper can be implemented, but the rigidity of the elastic bodies becomes excessive
Solution Approach 1:
The third elastic body is positioned at a specific location next to the outer elastic body in the circumferential direction, rather than being distributed radially. This localized positioning allows the system to achieve the necessary damping function without creating excessive rigidity throughout the entire elastic body structure.
Solution Approach 2:
By moving the third elastic body to a circumferential position overlapping the outer elastic body, the patent avoids the radial stacking that would create excessive rigidity. This dimensional repositioning maintains flexibility while achieving the dynamic damping effect.
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 suppresses the increase in outside diameter, reduces rigidity, and enhances damping performance by maintaining a compact design while ensuring effective vibration damping across various resonance frequencies.
Implementation Method 1
a dynamic damper that has a third elastic body coupled to any one of rotary elements forming the damper device and a mass body coupled to the third elastic body, and that applies vibration of an opposite phase to the rotary element to dampen vibration
Implementation Method 2
applies vibration of an opposite phase to the rotary element to dampen vibration
Implementation Method 3
an outer elastic body that transmits torque between the input element and the output element
Implementation Method 4
an inner elastic body that is disposed inward of the outer elastic body and that transmits torque between the input element and the output element
Data Source
AI summary
A damper device of a starting device includes a drive member, a driven member, outer springs that transmit torque between the drive member and the driven member, first and second inner springs that are placed inward of the outer springs and that transmit torque between the drive member and the driven member, and a dynamic damper having third springs coupled to a first intermediate member as a rotary element and a turbine runner as a mass body coupled to the third springs. The third springs of the dynamic damper are disposed so as to be located next to the outer springs of the damper device in the circumferential direction.