Planetary Gear Damper Layout for High-Torque Vibration Damping
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Solution Overview
Problem
Conventional damper devices face challenges in maintaining good vibration damping performance while controlling the increase in size, particularly when transmitting larger torques or receiving impact torques, due to limitations in elastic body design and planetary gear mechanisms.
Innovation Solution
The damper device incorporates multiple first and second elastic bodies that act in parallel, with the second elastic bodies positioned radially differently and circumferentially aligned with pinion gears, enhancing stiffness and controlling the axial and outside diameter, while a rotary inertia mass damper with a planetary gear mechanism effectively dampens vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the diameter of the elastic body is increased to transmit larger torque, then the torque transmission capability is improved, but the axial length and outside diameter of the damper device increase
Solution Approach 1:
The patent places the second elastic bodies in the radial space between the pinion gears and the outer peripheral surface of the damper device, nesting them within the existing structural envelope. This allows the elastic bodies to be positioned without increasing the axial length, while still providing the necessary torque transmission capability through their elastic deformation during planetary gear operation.
Solution Approach 2:
The patent transitions from increasing elastic body diameter (one dimension) to utilizing radial positioning between existing components (another dimension). By placing second elastic bodies in the radial gap between pinion gears and the outer periphery, the design achieves enhanced torque capacity without compromising axial compactness.
2Force
If the stiffness of the elastic body is increased to transmit larger torque, then the torque transmission capability is improved, but the vibration damping performance drops in low rotation speed range
Solution Approach 1:
The patent divides the torque transmission function between multiple elastic bodies arranged in parallel - first elastic bodies positioned radially inward and second elastic bodies positioned radially outward between the pinion gears and outer periphery. This segmentation allows each elastic body group to contribute to torque transmission while maintaining appropriate flexibility for vibration damping, as the distributed configuration prevents any single stiff element from dominating the system response.
Solution Approach 2:
The patent applies different spatial positioning strategies for different elastic bodies - first elastic bodies are positioned in one radial location while second elastic bodies are positioned in another radial location between the pinion gears and outer periphery. This local differentiation allows the system to optimize both torque transmission and vibration damping characteristics through the collective behavior of elastic bodies at different locations.
3Reliability
If the inner springs, outer springs, and pinion gears are located on different circumferences, then good vibration damping performance is ensured, but the outside diameter of the damper device increases
Solution Approach 1:
The patent merges the functions of multiple elastic bodies and pinion gears into a shared radial space. The second elastic bodies are positioned in the same radial region as the pinion gears, between them and the outer periphery, allowing these components to coexist without requiring separate circumferential zones. This merging approach maintains vibration damping performance while controlling the overall outside diameter.
Solution Approach 2:
The patent nests the second elastic bodies within the radial envelope defined by the pinion gears and the outer periphery. This nesting arrangement allows the elastic bodies to occupy the same radial space as the gear mechanism without increasing the outside diameter, while still providing the necessary compliance for vibration damping.
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 ensures effective vibration damping performance while preventing an excessive increase in size, by increasing stiffness and reducing hysteresis, thus enabling the transmission of large torques and impact torques efficiently.
Implementation Method 1
a plurality of first elastic bodies SP1 that each transmit torque between the input element (11) and the output element (15)... a plurality of second elastic bodies SP2 that act in parallel with the plurality of first elastic bodies SP1
Implementation Method 2
This configuration ensures effective vibration damping performance while preventing an excessive increase in size, by increasing stiffness and reducing hysteresis
Implementation Method 3
a planetary gear (21) including a sun gear (15) that rotates as a unit with the first rotating element... a carrier (11) that rotatably supports a plurality of pinion gears (23)... and a ring gear (25) that meshes with the plurality of pinion gears (23)
Implementation Method 4
a rotary inertia mass damper having a mass body (25) that rotates in accordance with relative rotation between a first rotating element (15) that is any of the plurality of rotating elements and a second rotating element (11) that is different from the first rotating element... The inertia torque of the sun gear associated with vibrations in the rotation direction acts as a load to control fluctuations in torque
Data Source
AI summary
A damper device includes rotating elements including an input element and an output element, first elastic bodies that each transmit torque between the input element and the output element, a plurality of second elastic bodies that act in parallel with the plurality of first elastic bodies when torque transmitted between the input element and the output element is greater than or equal to a predetermined value, and a rotary inertia mass damper. The rotary inertia mass damper includes a sun gear, a carrier that rotatably supports a plurality of pinion gears, and a ring gear that meshes with the plurality of pinion gears and that serves as a mass body. The plurality of second elastic bodies are located at a different position than the plurality of first elastic bodies in a radial direction of the rotating elements and are circumferentially aligned with the plurality of pinion gears.