Pendulum Torsional Damper Abutment Stop Control
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Solution Overview
Problem
Existing torsional oscillation damping devices in motor vehicle transmission systems face challenges in preventing rolling members from moving beyond desired limit positions, leading to inefficiencies and potential damage.
Innovation Solution
The device incorporates a support that rotates around an axis, with pendular bodies having two masses connected by members, and includes abutment members that protrude into the axial space between the masses to prevent rolling members from moving beyond stop positions, allowing for controlled movement and filtering of torsional oscillations without hindering the pendulum body's movement relative to the support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the axial space between the two pendulum masses is made large enough to allow free movement of the rolling member, then the rolling member can move beyond the stop position, but this leads to undesired positions and potential damage; if the axial space is reduced to prevent movement beyond stop position, then the pendulum body's movement relative to the support is hindered
Solution Approach 1:
The patent introduces abutment members that create localized constraints within the axial space. These abutment members are positioned to prevent rolling member movement beyond stop positions while leaving other regions of the axial space open to maintain pendulum body movement flexibility. This local quality approach allows different zones of the axial space to serve different functions: one zone restricts rolling member movement while another zone permits pendulum body oscillation.
Solution Approach 2:
The abutment members act as intermediary elements between the pendulum masses and the rolling member. They mediate the interaction by providing controlled stop positions for the rolling member without directly constraining the pendulum body's movement. The abutment members translate the need for rolling member limitation into a form that does not hinder pendulum oscillation, serving as a buffer or mediator in the mechanical interaction.
2Reliability
If abutment members are added to prevent rolling member displacement beyond stop position, then reliability improves, but device complexity increases
Solution Approach 1:
The abutment members are integrated with the existing pendulum mass structure rather than being separate components. By merging the abutment function into the pendulum masses themselves, the patent avoids adding independent complex subsystems. The abutment members become part of the pendulum assembly, reducing overall device complexity while still providing the necessary position control function.
Solution Approach 2:
The abutment members serve multiple functions: they define stop positions for the rolling member, maintain the structural integrity of the pendulum body, and potentially serve as mounting points for other components. This multi-functionality reduces the need for additional dedicated parts, thereby limiting the increase in device complexity while achieving reliable position control.
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 solution effectively prevents rolling members from moving beyond stop positions, ensuring efficient filtering of torsional oscillations and reducing wear and noise, while maintaining the movement flexibility of the pendulum bodies, thus enhancing the overall performance of the damping system.
Implementation Method 1
the movement with respect to the support of each pendular body being guided by two rolling members cooperating on the one hand with rolling tracks secured to the support, and on the other hand with rolling tracks secured to the pendular bodies
Implementation Method 2
each pendulum body comprising, for each rolling member guiding the movement of this pendulum body, at least one abutment member, this abutment member protruding into the axial space defined between the two pendulum masses of this pendulum body so as to prevent the displacement of the running gear beyond at least one stop position
Implementation Method 3
Device for damping torsional oscillations, in particular for a motor vehicle transmission system. In such an application, the torsional oscillation damping device can be integrated into a torsional damping system of a clutch capable of selectively connecting the heat engine to the gearbox, in order to filter the vibrations due to motor acyclisms
Data Source
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AI summary
Torsional oscillation damping device ( ), comprising: - at least one support (2) capable of rotating about an axis (X), - a plurality of pendulum bodies (3) movable relative to the support (2), each pendulum body (3) comprising: - a first and a second pendulum mass (5), - at least two connecting members (6) of the first and second pendulum masses (5), - a plurality of rolling members (11), so as to guide the displacement of this pendulum body (3) relative to the support (2), each pendulum body (3) comprising, for each rolling member (11) guiding the displacement of this pendulum body (3), at least one stop member (30), this stop member (30) projecting into the axial space defined between the two pendulum masses (5) of this pendulum body (3) so as to prevent the displacement of the rolling member (11) beyond at least one stop position.