Pendulum Damper Geometry for Torsional Oscillation Holding Strength
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Solution Overview
Problem
Industrial vehicle transmission systems face challenges in filtering high-intensity torsional oscillations, which can cause pendulum masses to separate during operation, posing risks to the crankshaft and combustion engine.
Innovation Solution
A pendular device with a rotatable support and movable pendulum bodies, featuring a connecting member with specific geometric dimensions and a radial compact design, optimized for holding pendulum masses and incorporating abutment damping members to manage shocks and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pendular device is secured to the primary flywheel directly downstream of the combustion engine, then the torsional oscillations can be filtered first, but the pendulum masses are subjected to extremely high stresses that may cause separation during operation
Solution Approach 1:
The connecting member extends axially between two parallel planes, creating a three-dimensional structure that distributes the holding force across multiple planes rather than concentrating it in a single plane. This dimensional approach increases the holding strength while maintaining the filtering effectiveness.
Solution Approach 2:
The patent specifies that the distance between the first and second planes is 1.5 to 3.5 times greater than the distance between the third and fourth planes. This parameter change optimizes the geometric configuration to enhance the holding strength of the pendulum masses while preserving the torsional oscillation filtering capability.
2Strength
If the connecting member has sufficient length to hold pendulum masses securely, then the holding strength is improved, but the device complexity and space requirements increase
Solution Approach 1:
The connecting member is divided into distinct segments defined by four parallel planes, with each segment serving a specific functional purpose. This segmentation allows the structure to achieve high holding strength through optimized geometry while maintaining manageable complexity through modular design.
Solution Approach 2:
By extending the connecting member axially between two parallel planes and defining rolling tracks on these planes, the invention utilizes the third dimension to increase holding strength without proportionally increasing overall device complexity. The axial extension provides structural advantage while the planar configuration maintains design simplicity.
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 solution effectively filters torsional oscillations, enhances the holding of pendulum masses, and reduces the risk of separation, ensuring the stability and safety of the transmission system by minimizing wear and maintaining the structural integrity of the device.
Implementation Method 1
the movement of the pendulum body relative to the support being guided by rolling members cooperating on the one hand with integral rolling tracks of the support, and on the other hand with rolling tracks integral with the pendular bodies
Implementation Method 2
a pendular device capable of being integrated into a component for a vehicle transmission system... at least one pendulum body movable relative to the support
Implementation Method 3
in order to filter the torsional oscillations due to the acyclisms of the engine
Data Source
Figure 1
Figure 2~4
Figure 3~5
AI summary
The invention relates to a pendulum device (5) comprising a mounting (7), rotatably movable and capable of being rigidly connected to the component, and at least one pendulum body (8) movable relative to the mounting (7), the movement of the pendulum body relative to the mounting being guided by at least one rolling member (22) engaging with at least one first raceway (24) rigidly connected to the mounting and at least one second raceway (25) rigidly connected to the pendulum body, the pendulum body comprising first and second pendulum masses (10), and at least one member (20) linking the first and second masses (10) pairing said masses, the linking member being arranged in an opening (21) of the mounting of which one portion of the contour defines the first raceway (24), characterised in that the linking member extends between a first plane (P1) and a second plane (P2) which are tangential to the linking member, the second raceway (25) is defined by the contour of the linking member (20) and extends from a third plane (P3) to a fourth plane (P4) which are secant to the linking member, and a first distance D5 measured between the first plane and the second plane is 1.5 to 3.5 times greater than a second distance D6 measured between the third plane and the fourth plane, the first plane, the second plane, the third plane and the fourth plane being parallel to one another.