Torsional Oscillation Damping Device Gravity Compensation
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Solution Overview
Problem
Conventional torsional oscillation damping devices for motor vehicle transmission systems are sensitive to gravity, leading to undesired displacements and reduced filtering performance, and the introduction of springs to mitigate this issue complicates the design and requires additional housing, which is costly and complex.
Innovation Solution
The use of interposition members between pendulum bodies, which are free to move within windows on the support, maintaining a constant minimum gap and limiting the effect of gravity, allowing the pendulum bodies to filter torsional oscillations effectively without the need for additional housing or complex fixing mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If springs are inserted between pendulum bodies to counteract gravity, then the filtering performance is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
A gravity compensation element is introduced as an intermediary component between the pendulum body and the support. This element selectively compensates for gravitational effects on the pendulum body during rotation, while maintaining simplicity by integrating directly with existing components rather than adding complex spring mechanisms or additional housings.
Solution Approach 2:
The gravity compensation element changes its effective position or orientation relative to the pendulum body as the support rotates, thereby dynamically adjusting the compensation force to counteract gravity's varying influence on the pendulum body throughout the rotation cycle.
2Reliability
If springs are inserted between pendulum bodies to counteract gravity, then the filtering performance is improved, but additional housings and fixing means are required, increasing manufacturing cost
Solution Approach 1:
The gravity compensation element is merged with or integrated into the existing support and pendulum body structure. This integration eliminates the need for separate housings and complex fixing mechanisms, reducing manufacturing steps and costs while maintaining the gravity compensation function.
Solution Approach 2:
The gravity compensation element serves multiple functions: it compensates for gravitational effects, maintains the pendulum body's positional stability, and integrates with the existing structural components. This multi-functionality reduces the need for additional specialized components.
3Object-affected harmful factors
If springs are inserted between pendulum bodies, then gravity influence is reduced, but additional resonant frequency appears
Solution Approach 1:
The gravity compensation element acts as a mediator that passively counteracts gravitational forces through its geometric configuration and position, rather than through elastic deformation like springs. This eliminates the introduction of additional resonant frequencies while still providing effective gravity compensation.
4Object-affected harmful factors
If open cutouts are provided in the support for spring insertion, then gravity compensation is achieved, but the travel of pendular bodies is reduced
Solution Approach 1:
The gravity compensation function is merged into the existing support structure without requiring open cutouts. The support maintains its structural integrity and enclosed design, preserving the full travel range of the pendulum bodies while still providing effective gravity compensation through the integrated compensation element.
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 reduces the influence of gravity on pendulum bodies, maintaining consistent gap distances between them and enhancing the filtering performance of torsional oscillations while simplifying the design and reducing costs.
Implementation Method 1
two rolling members, each rolling member cooperating with a first bearing secured to the support and with a second rolling track secured to a pendulum body, the movement of each pendulum body relative to the support being guided by at least two of these rolling members
Implementation Method 2
reduces the influence of gravity on pendulum bodies, maintaining consistent gap distances between them
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
Torsional oscillation damping device (1), comprising: - at least one support (2) capable of rotating about an axis (X), - a plurality of pendulum bodies (3), each pendulum body (3) being movable relative to the support (2), - a plurality of rolling members (11), each rolling member (11) cooperating with a first rolling track (12) fixed to the support (2) and with a second rolling track fixed (13) to a pendulum body (3), the movement of each pendulum body (3) relative to the support (2) being guided by at least two of these rolling members (11), and - a plurality of interposition members (20), the support (2) comprising a plurality of windows (19) in each of which two rolling members (11) are received,one of these rolling elements (11) cooperating with a second rolling track (13) integral with one of the pendulum bodies (3) and the other of these rolling elements (11) cooperating with a second rolling track (13) integral with another of these pendulum bodies (3), said pendulum bodies (3) being circumferentially adjacent, each interposition element (20) being disposed in a window (19) of the support (2), each interposition element (20) being movable relative to each of the two pendulum bodies (3) whose displacement relative to the support (2) is guided by one of the rolling elements (11) received in this window (19), each interposition element (20) being able to come into contact: - on the one hand with a portion of the contour (16) of the window (19) in which it is received, - on the other hand with a portion (6, 7, 8, 45) of one of the two pendulum bodies (3), and - on the other hand with a portion (6, 7, 8, 45) of the other of the two pendulum bodies (3).,