Pendulum Raceway Layout for Torsional Oscillation Filtering
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Solution Overview
Problem
Existing pendulum damping devices in motor vehicle transmission systems face limitations in effectively filtering torsional oscillations and reducing noise and wear, particularly at higher rotational speeds.
Innovation Solution
The pendulum damping device incorporates a support that rotates around an axis, with at least one pendulum body and rolling members guiding its movement. The rolling tracks are designed with a first portion on either side of a rest position for filtering torsional oscillations and additional second portions beyond the ends of the first portion, allowing for extended filtration and increased torque capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the rolling tracks are extended beyond the useful range for filtering acyclisms, then the noise and wear are reduced, but the torque capacity is insufficient
Solution Approach 1:
The rolling track is segmented into three distinct portions: a first portion for filtering acyclisms, and two second portions extending beyond the first portion. This segmentation allows each portion to serve its specific function while collectively increasing the torque capacity without compromising noise and wear reduction
Solution Approach 2:
The rolling track is designed to extend in the radial direction beyond the conventional useful range. By utilizing the radial dimension to create second portions that extend outward, the invention increases the path length and torque capacity while maintaining the noise and wear reduction benefits
2Power
If the path of the center of gravity is extended using second portions, then the torque capacity increases by 5-10%, but the device complexity increases
Solution Approach 1:
The extended rolling track with second portions serves multiple functions simultaneously: it filters acyclisms during the first portion, reduces noise and wear through the extended path, and increases torque capacity by 5-10% through the additional second portions. This multi-functionality justifies the increased complexity
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 enhances the filtering performance of the pendulum damping device, particularly at higher rotational speeds, and increases the torque capacity by 5-10% by utilizing the extended path of the pendulum body's center of gravity.
Implementation Method 1
at least one rolling member guiding the movement of the pendulum body relative to the support, this rolling member cooperating with at least one first rolling track secured to the support and with at least one second rolling track secured to the pendulum body
Implementation Method 2
a first portion arranged on either side of a rest position, this first portion having a shape allowing the filtration of an order value of the torsional oscillations by the pendulum body along this first portion
Implementation Method 3
two second portions, each arranged beyond one end of the first portion, each second portion having a shape allowing the filtration of a frequency by the pendulum body along one of these second portions
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Disclosed is a pendulum damping device (1) that comprises: - a support (2) capable of rotating about an axis (X); - at least one pendulum body (3) capable of moving relative to the support (2); and - at least one rolling member (11) that guides the movement of the pendulum body (3) relative to the support (2), the rolling member (11) cooperating with at least one first raceway (12) rigidly affixed to the support (2) and with at least one second raceway (13) rigidly affixed to the pendulum body (3), at least one of the first raceway (12) and the second raceway (13) having a shape such that the path of the centre of gravity of the pendulum body (3) during the movement thereof relative to the support (2) comprises: - a first portion (30) placed to either side of an idle position (P0), said first portion (30) having a shape enabling an order value of the torsional oscillations to be filtered by the pendulum body (3) along said first portion (30); and - two second portions (31), each of which is placed beyond an end (P1) of the first portion (30), each second portion (31) having a shape enabling a frequency to be filtered by the pendulum body (3) along one of these second portions (31).