Pendulum Vibration Damper Retainer Axial Constraint
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing torsional vibration dampers face issues where the retainer can be tilted or moved axially, leading to improper retention and oscillation of rolling masses, potentially causing disengagement or jamming, which affects the suppression of torsional vibrations.
Innovation Solution
Incorporating a restriction member on either the retainer or the casing to prevent axial movement of the retainer, ensuring the rolling masses are held in a correct posture and oscillate accurately by maintaining a clearance between the casing and the rolling mass shorter than the retainer's thickness, thereby preventing the retainer from tilting or sticking into the clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the retainer is designed to hold rolling masses in chambers, then the rolling masses are retained and oscillated to damp torsional vibrations, but the retainer can be tilted or moved axially by disturbances such as engine vibration, causing the rolling masses to disengage or the retainer to jam
Solution Approach 1:
The patent applies preliminary anti-action by providing a restriction member that proactively prevents the retainer from moving axially before disengagement or jamming can occur. The restriction member is positioned to contact the retainer and block axial movement, counteracting the effect of engine vibrations and other disturbances before they can cause the rolling masses to disengage or the retainer to jam between the rolling masses and casing.
2Stability of the object's composition
If a restriction member is added to prevent axial movement of the retainer, then the retainer is stabilized and rolling masses are held properly, but the device complexity increases
Solution Approach 1:
The restriction member is designed to serve multiple functions: it restricts axial movement of the retainer, maintains proper spacing between the retainer and casing, and prevents both disengagement of rolling masses and jamming of the retainer. By consolidating these protective functions into a single component, the patent minimizes the increase in device complexity while achieving comprehensive stabilization.
3Reliability
If the clearance between casing and rolling mass is reduced to prevent retainer jamming, then the retainer cannot stick into the clearance, but the rolling mass may interfere with the casing
Solution Approach 1:
The restriction member acts as an intermediary element between the retainer and the casing. It provides a controlled contact interface that prevents the retainer from moving axially into the clearance between the rolling mass and casing, thereby eliminating the jamming risk. At the same time, the restriction member's positioning ensures that the rolling mass maintains an appropriate clearance from the casing, preventing interference while the retainer is stabilized.
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 configuration ensures the retainer holds the rolling masses correctly, allowing them to oscillate effectively along a designed orbit, preventing detachment and jamming, and minimizing the weight and size of the restriction member for reduced weight and manufacturing costs.
Implementation Method 1
each of the rolling mass is centrifugally pushed onto the raceway surface of the chamber
Implementation Method 2
torsional vibrations resulting from the torque pulses are damped by the oscillating motions of the rolling masses
Data Source
AI summary
A pendulum vibration damper in which a retainer is prevented from being moved or tilted in an axial direction. In the pendulum vibration damper, a restriction member formed on any one of the retainer and an inner face of the casing to be brought into contact to the other one of the retainer and the inner face of the casing when the retainer is moved or tilted in an axial direction of the rotary disc. A clearance between the casing and the rolling mass in the axial direction is shorter than a thickness of the retainer in the axial direction.