Reverse-Rotating Inertial System for Engine Rolling Vibration
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Solution Overview
Problem
Existing rolling vibration reduction devices for internal combustion engines are ineffective in reducing vibrations during resonance, as they disconnect during resonance events, leading to increased vibration issues.
Innovation Solution
A rolling vibration reduction device with a main inertial system, a driving force transmission mechanism that reverses the rotational driving force, and a sub-inertial system that rotates in the opposite direction to the crankshaft, setting the torsional resonance frequency higher than the explosion primary frequency to prevent operation at harmful frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the rolling vibration reduction device is disconnected during resonance to avoid useless rotation, then energy loss is reduced, but rolling vibration cannot be effectively reduced during resonance events
Solution Approach 1:
The patent changes the torsional resonance frequency parameter of the vibration reduction device to be higher than the explosion primary frequency at maximum engine speed in the preset operating region. This parameter adjustment ensures the device operates effectively during resonance conditions without disconnection, resolving the contradiction between energy loss and vibration reduction effectiveness.
2Reliability
If the torsional resonance frequency is set higher than the explosion primary frequency, then rolling vibration is reliably reduced, but the device complexity increases due to precise frequency matching requirements
Solution Approach 1:
The patent simplifies the frequency matching requirement by setting the torsional resonance frequency to be simply higher than the explosion primary frequency at maximum engine speed, rather than requiring precise matching. This approach maintains vibration reduction effectiveness while reducing the complexity of frequency coordination between the vibration reduction device and the engine.
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 device reliably reduces rolling vibrations by ensuring the internal combustion engine operates below the torsional resonance frequency, thereby minimizing vibration across the engine's operating range.
Implementation Method 1
a sub-inertial system configured to rotate by the rotational driving force transmitted from the driving force transmission mechanism and to reduce rolling vibration of the internal combustion engine associated with rotation of the crankshaft by rotating in an opposite direction to the crankshaft
Implementation Method 2
A torsional resonance frequency in the rolling vibration reduction device is set to a value higher than an explosion primary frequency at a maximum engine speed in a preset operating region of the internal combustion engine
Data Source
AI summary
A rolling vibration reduction device for an internal combustion engine includes: a main inertial system configured to rotate with a crankshaft of the internal combustion engine; a driving force transmission mechanism configured to transmit a rotational driving force of the crankshaft, a direction of the rotational driving force being reversed by the driving force transmission mechanism; and a sub-inertial system configured to rotate by the rotational driving force transmitted from the driving force transmission mechanism and to reduce rolling vibration of the internal combustion engine associated with rotation of the crankshaft by rotating in an opposite direction to the crankshaft. A torsional resonance frequency in the rolling vibration reduction device is set to a value higher than an explosion primary frequency at a maximum engine speed in a preset operating region of the internal combustion engine.