Reducer Casing Connecting Column Layout for Lower Vibration NVH
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Solution Overview
Problem
The reduction in weight of automobile reducer casings leads to decreased connection strength and increased vibration amplitude, affecting NVH performance.
Innovation Solution
A reducer casing structure comprising a front casing, a rear casing, and a connecting column that is bolt-connected to enhance connection strength, reduce vibration, and improve NVH performance, with the connecting column being optionally made of alloy and having a stepped shape for increased contact area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the reducer casing weight is reduced, then the weight parameter is improved, but the connection strength decreases and vibration amplitude increases
Solution Approach 1:
The reducer casing is divided into front casing and rear casing as separate components, connected through connecting columns. This segmentation allows each casing part to be optimized for light weight while the connecting columns provide localized reinforcement to maintain connection strength without increasing overall casing weight.
Solution Approach 2:
The connecting columns are strategically positioned at specific locations where connection strength is most needed, rather than uniformly reinforcing the entire casing structure. This local reinforcement approach maintains overall light weight while providing targeted strength enhancement at critical connection points.
2Weight of moving object
If the reducer casing weight is reduced, then the weight parameter is improved, but the vibration amplitude increases
Solution Approach 1:
The connecting columns act as intermediary elements between the front and rear casings, providing structural mediation that reduces vibration transmission. These columns are designed with appropriate dimensions and positioning to dampen vibrations while maintaining the light weight advantage of the separated casing structure.
Solution Approach 2:
The connecting columns extend in the axial direction between the front and rear casings, creating a three-dimensional structural framework. This spatial arrangement provides vibration damping in multiple directions while maintaining minimal material usage for the overall light weight design.
3Strength
If the connecting column is made with larger contact area, then the connection strength is improved, but the device complexity increases
Solution Approach 1:
The connecting column features a stepped shape with varying cross-sectional dimensions, where the contact areas with the front and rear casings are enlarged through parameter optimization. This allows increased connection strength through larger contact areas while maintaining a relatively simple overall structure that does not significantly increase device complexity.
Data Source
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AI summary
A reducer casing structure is disclosed, which comprises a front casing (2), a rear casing (1) and a connecting column (3); the front casing (2) and the rear casing (1) are sealedly connected to form therein a cavity structure for accommodating a reducer; the connecting column (3) is provided in the cavity structure and is detachably or partially detachably connected between the front casing (2) and the rear casing (1), the connection mode of the connecting column (3) with the front casing (2) and the rear casing (1) is bolt connection or integrated casting, the connecting column (3) is used to improve connection strength of the reducer casing structure, reduce casing vibration and improve NVH performance of the reducer. The reducer casing structure according to the present disclosure reduces the deformation of the front casing (2) and the rear casing (1) of the reducer during operation, and improves the NVH of the reducer itself or the whole power assembly; moreover, the reducer casing structure is easy to install and occupies less space.