Pendulum Damper Support Layout for Lower Centrifugal Stress
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Solution Overview
Problem
Existing pendulum damping devices for motor vehicle transmission systems face issues with support robustness due to significant stresses exerted during centrifugation, which can lead to weakening or destruction of the support structure.
Innovation Solution
A pendulum damping device design where the tab is positioned entirely or partially within a maximum angular sector of the support's window, angularly located elsewhere than between the first two rolling tracks, reducing stress concentrations and improving constraint distribution within the support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the window in the support is made large to accommodate pendulum bodies and transmit torque, then the functional requirements are met, but significant centrifugal forces are exerted on the radially intermediate areas of the support, weakening or destroying it
Solution Approach 1:
The support structure is segmented into distinct functional zones: the window area for torque transmission and pendulum accommodation, the leg area for elastic element mounting, and the radially intermediate areas. By segmenting the structure, stress concentrations are avoided and each zone can be optimized for its specific function without compromising overall strength.
Solution Approach 2:
Different regions of the support are designed with locally optimized properties. The window edges are reinforced for torque transmission, the leg positions are strategically located for elastic element cooperation, and the radially intermediate areas are configured to withstand centrifugal forces. This local quality approach ensures that each area has the appropriate structural characteristics for its specific loading conditions.
2Power
If the leg is positioned to effectively transmit torque from elastic return elements, then torque transmission is improved, but stress concentrations increase on the support structure under centrifugal loading
Solution Approach 1:
The leg positions are predetermined and optimized during the design phase to balance torque transmission requirements with stress distribution considerations. The leg geometry and positioning are pre-configured to engage with elastic return elements at optimal locations, ensuring effective torque transmission while avoiding high-stress zones under centrifugal loading.
Solution Approach 2:
The leg parameters (position, orientation, cross-sectional area, and material properties) are adjusted to optimize the balance between torque transmission capability and stress concentration reduction. By changing these parameters, the leg can effectively transmit torque while distributing stresses more favorably across the support structure.
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 design effectively reduces stresses on the support by repositioning the tab away from the rolling tracks, enhancing the robustness and durability of the damping device while maintaining effective torque transmission and oscillation filtering.
Implementation Method 1
two rolling elements guiding the movement of the pendulum body relative to the support, each rolling element cooperating with a first rolling track fixed to the support and with a second rolling track fixed to the pendulum body
Implementation Method 2
a leg adapted to cooperate with elastic return elements
Implementation Method 3
at least one pendulum body, movable relative to the support and comprising two pendulum masses respectively arranged axially on one side of the support
Implementation Method 4
the rest position of a pendulum body is that in which the pendulum body is centrifugally suspended
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Pendulum damping device (20), comprising: - a support (13) movable in rotation about an axis (X), and comprising a leg (19) adapted to cooperate with elastic return elements (18), - at least one pendulum body, movable relative to the support (13) and comprising two pendulum masses (14) respectively arranged axially on one side of the support (13), these two pendulum masses being joined together by a connecting element, and - two rolling elements (40) guiding the movement of the pendulum body relative to the support (13), each rolling element (40) cooperating with a first rolling track (42) fixed to the support (13) and with a second rolling track (43) fixed to the pendulum body, each first rolling track (42) being defined by an edge of the same window (33) formed in the support (13) radially inward relative to the leg (19),and each second bearing track (43) being defined by an edge of the same spacer (31) of the connecting member, the window (33) formed in the support (13) defining a maximum angular sector (a) from the axis of rotation (X) of the support (13), and the lug (19) being disposed in whole or in part within this angular sector (a), the lug (19) being located angularly elsewhere than between the first two bearing tracks (42).