Pendulum Torsional Damper With Elastic Stops for Low-Speed Shocks
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Solution Overview
Problem
Existing torsional oscillation damping devices in motor vehicle transmission systems experience shocks between pendulum bodies and the support, particularly at low engine rotation speeds, which are difficult and costly to mitigate.
Innovation Solution
A torsional oscillation damping device with a stop damping member having a regular shape and elastic properties, positioned to absorb shocks by compression, is integrated into the pendulum bodies, allowing contact between the stop damping member and the support, and optionally with interposition pieces to limit axial displacement and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stop damping member with a complex shape is used to absorb shocks, then the shock absorption effectiveness is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent changes the geometric parameters of the stop damping member from a complex shape to a simple cylindrical shape with diameter of 3 to 7 mm. This parameter simplification maintains the shock absorption function while dramatically reducing manufacturing complexity and cost, directly resolving the technical contradiction between reliability and ease of manufacture.
Solution Approach 2:
The patent employs a simple cylindrical stop damping member that can be easily replaced if needed, rather than a complex expensive component. This approach prioritizes ease of manufacture and replacement over long service life, resolving the contradiction by making the component cheap and simple while maintaining adequate shock absorption performance.
2Object-affected harmful factors
If shock-absorbing coating is applied to rivets, then the shocks between pendulum bodies and support are reduced, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts the shock absorption function from the rivet coating approach and implements it through a dedicated stop damping member. This separates the shock absorption function from the structural connection function, allowing the use of simple rivets without complex coatings while maintaining shock reduction effectiveness.
Solution Approach 2:
The stop damping member acts as an intermediary element between the pendulum body and support, providing shock absorption without requiring modification of the rivets or pendulum bodies. This intermediary approach eliminates the need for complex rivet coatings while effectively reducing shocks.
3Volume of moving object
If the stop damping member has a smaller diameter, then it fits better in the limited space, but the shock absorption capacity is reduced
Solution Approach 1:
The patent optimizes the diameter parameter of the stop damping member to be between 3 to 7 mm, finding the optimal balance between space constraints and shock absorption capacity. This parameter optimization resolves the contradiction by selecting a diameter that fits the limited space while maintaining adequate shock absorption performance.
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
The device effectively dampens shocks at low engine speeds, reducing oscillation amplitudes by at least 10% and minimizing wear and noise, while being simpler and less expensive to produce.
Implementation Method 1
The stop damping member has elastic properties allowing the damping of shocks linked to the contact between the support and the pendulum body. This damping is then enabled by compression of the stop damping member.
Data Source
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AI summary
The invention relates to a device (1) for damping torsional oscillations, comprising: a support (2) rotatable about an axis (X); at least one pendulum body (3) that can move relative to the support (2); at least one rolling member (11) guiding the movement of the pendulum body (3) relative to the support (2); and at least one damping stop member including, in at least one plane orthogonal to the axis of rotation (X) of the support (2), a section (44) with at least two axes of symmetry, said section (44) having an outer edge (41) in contact simultaneously with the pendulum body (3) and the support (2) for relative positions of the pendulum body (3) in relation to the support (2).