Load Device Assembly with Inertia-Matched Gearing for Gear Rattle Suppression
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Solution Overview
Problem
Existing load device assemblies in internal combustion engines face issues with gear rattle and inefficient inertia distribution, leading to increased load on the power gear and reduced efficiency.
Innovation Solution
The load device assembly incorporates an idle gear with a plurality of openings to reduce its inertia, while the driven gear and crankshaft are designed with increased mass and inertia to match the power gear's inertia, thereby suppressing gear rattle and improving rotational stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driven gear and shaft are designed with increased mass and inertia to match the power gear's inertia, then gear rattle is suppressed and rotational stability is improved, but the weight of the load device assembly increases
Solution Approach 1:
The patent applies parameter changes by modifying the mass and inertia parameters of the driven gear and shaft to match the power gear's inertia characteristics. This involves adjusting the mass distribution and moment of inertia values to achieve optimal rotational stability and suppress gear rattle, directly addressing the contradiction between reliability improvement and weight increase.
Solution Approach 2:
The patent employs counterweight principles by strategically distributing mass within the driven gear and shaft assembly to balance the rotational inertia. By positioning mass strategically (similar to counterweight mechanisms), the system achieves rotational stability and reduces gear rattle while minimizing unnecessary weight increases.
2Weight of moving object
If the idle gear includes a plurality of openings to reduce its inertia, then the overall inertia of the load device assembly is decreased, but the structural strength of the idle gear may be reduced
Solution Approach 1:
The patent applies segmentation by dividing the idle gear structure into segments with strategic openings. Instead of removing the entire gear, specific openings are created in non-critical areas to reduce inertia while maintaining structural integrity. This segmented approach allows weight reduction without compromising overall strength.
Solution Approach 2:
The patent implements local quality changes by applying openings only in specific locations of the idle gear where mass reduction is most effective for inertia reduction, while maintaining solid construction in critical load-bearing areas. This localized modification optimizes the strength-inertia trade-off.
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 effectively suppresses gear rattle and enhances rotational stability, ensuring efficient operation of the load device assembly by aligning the inertia of the driven gear and crankshaft with the power gear, thus improving the overall performance of the internal combustion engine.
Implementation Method 1
idle gear includes a plurality of openings, and third inertia due to rotation of the idle gear is decreased as compared with fourth inertia in a case where the plurality of openings is not provided
Implementation Method 2
inertia of the driven gear and the shaft is set as second inertia larger than the first inertia, the second inertia is made larger to approach inertia of the power gear
Data Source
AI summary
A load device assembly includes: an idle gear rotating in conjunction with rotation of a power gear of the internal combustion engine; a driven gear rotating by receiving a rotational force of the power gear via the idle gear, the idle gear disposed between the driven gear and the power gear; and a load device rotating integrally with the driven gear. As compared with first inertia by a first mass at least necessary for rotating a shaft to serve as a load of the power gear, inertia of the driven gear and the shaft is set as the second inertia larger than the first inertia, the second inertia is made larger to approach inertia of the power gear. The idle gear includes openings. Third inertia due to rotation of the idle gear is decreased as compared with fourth inertia in a case where the openings are not provided.