Cam-Track Vibration Damper for Broad-Range Torsional Filtering
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Solution Overview
Problem
Existing vibration dampers for internal combustion engines are complex, noisy, and inefficient over a range of speeds, with elastomeric blocks adding cost and aging prematurely, and failing to optimally filter acyclic irregularities beyond optimized speed.
Innovation Solution
A vibration damper with two rotating members, an inertial flywheel, and a member to be damped, connected by resiliently deformed cam tracks and rollers, allowing relative angular displacement and varying damping capabilities, minimizing friction and noise, and maintaining contact at all speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If elastomeric blocks are used to block connecting modules at high speeds, then the mechanism is protected from overload, but the expense and premature aging increase
Solution Approach 1:
The invention removes the elastomeric blocks entirely from the mechanism. Instead of using blocking elements that cause aging and cost issues, the design relies on the inherent mechanical geometry of the connecting modules and pivots to naturally prevent overload conditions, eliminating the need for separate protective components.
Solution Approach 2:
The connecting modules are designed to self-regulate through their geometric configuration. When excessive speed or load occurs, the mechanical arrangement of the pivots and connecting rods automatically limits the motion range, providing self-protection without requiring additional components like elastomeric blocks.
2Reliability
If multiple articulated modules with oscillating arms are used, then vibration filtering is optimized, but the device complexity increases
Solution Approach 1:
The vibration filtering function is achieved through a simplified segmented approach using only two rotating members (the member to be damped and the inertial flywheel) connected by one or more connecting modules. This segmentation reduces the complex multi-module articulated structure to essential components while maintaining filtering effectiveness.
Solution Approach 2:
Instead of using multiple oscillating arms and connecting rods to achieve filtering, the invention inverts the approach by using a direct two-member system where the inertial flywheel and connecting modules work in opposition to the acyclic irregularities, simplifying the overall mechanism while preserving the filtering function.
3Strength
If blocking of connecting modules is implemented, then mechanical strength limits are protected, but noise during transitional phases increases
Solution Approach 1:
The invention removes the blocking mechanism that causes noise during transitional phases. By eliminating the need for blocks to engage and disengage at speed transitions, the source of noise is removed while alternative protective measures are built into the connecting module geometry.
Solution Approach 2:
The connecting modules are designed with geometric features that provide gradual transition and load distribution before critical limits are reached. This beforehand design prevents sudden engagements and disengagements that generate noise, while still protecting against excessive loads on the pivots.
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 provides effective attenuation of acyclic irregularities across a broader speed range with reduced noise and complexity, maintaining performance without additional energy-dissipating components, and aligning resonance frequency with engine irregularity frequencies for enhanced vibration reduction.
Implementation Method 1
a resilient element capable of being deformed to ensure resilient bracing of the cam track against the roller
Implementation Method 2
an inertial flywheel oscillating around the axis of revolution
Implementation Method 3
By centrifuge effect, the articulated modules are opposed to relative rotation of the inertial masses by exerting a restoring torque
Implementation Method 4
a roller associated with a first of the two rotating members and a cam track connected resiliently by a resilient element to a second of the two rotating members, wherein the resilient element is capable of being deformed to ensure resilient bracing of the cam track against the roller, thus permitting the roller to roll over the cam track
Data Source
AI summary
A vibration damper is provided with two rotating members, i.e. an oscillating inertial flywheel and a member to be damped driven by a torque following a torque path between a driving member and a driven member, wherein the inertial flywheel is connected kinematically to the torque path between the driving member and the driven member solely by way of the member to be damped. Connecting modules between the two rotating members permit a relative angular displacement θ between the two rotating members on the two sides of a reference relative angular position. Each connecting module is provided with a roller associated with a first of the two rotating members and a cam track connected resiliently by a resilient element to a second of the two rotating members.