Reinforced Engine Housing Assembly for Stable Gear Backlash
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Solution Overview
Problem
Modern engine assemblies made from aluminum face challenges due to its higher coefficient of thermal expansion, leading to performance issues such as increased backlash between gears, wear, and vibrations, which existing technologies have not adequately addressed.
Innovation Solution
Incorporating a reinforcement member with a different coefficient of thermal expansion into the engine housing component, which surrounds the bores and bearing structures, helps to constrain thermal growth and maintain a constant backlash setting between gears, thereby reducing adverse noise, vibration, and harshness (NVH) conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If aluminum is used to manufacture engine housing components, then weight is reduced, but thermal expansion causes increased backlash between gears
Solution Approach 1:
The engine housing assembly uses a composite structure combining aluminum housing components with a reinforcement member made of material having different thermal expansion characteristics. This composite approach allows the lightweight aluminum housing to be combined with a material that maintains dimensional stability, thereby reducing overall weight while compensating for thermal expansion-induced backlash.
Solution Approach 2:
The reinforcement member is strategically positioned within the aluminum housing to provide localized structural support and thermal expansion compensation. By placing the reinforcement member at critical locations such as surrounding gear bores and bearing structures, the design maintains lightweight construction overall while providing targeted areas of enhanced dimensional stability to control gear backlash.
2Weight of moving object
If aluminum is used to manufacture engine housing components, then weight is reduced, but thermal expansion leads to gear wear and vibrations
Solution Approach 1:
The composite structure of aluminum housing with reinforcement member provides both weight reduction and improved reliability. The aluminum provides lightweight construction while the reinforcement member with different thermal expansion properties maintains stable clearances and reduces vibrations, thereby protecting the gear set from wear and improving overall reliability.
Solution Approach 2:
The invention converts the harmful effect of thermal expansion into a beneficial outcome by using the differential thermal expansion between the aluminum housing and reinforcement member to maintain stable gear clearances. The reinforcement member's different expansion characteristics compensate for the aluminum's high expansion, transforming what would be a source of vibration and wear into a mechanism that preserves gear set performance.
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 reduces the impact of thermal expansion on gear alignment, maintaining a consistent backlash and enhancing the longevity and efficiency of the gear set by closely matching the thermal expansion of the reinforcement member with the gear set materials.
Implementation Method 1
aluminum has a greater coefficient of thermal expansion than materials that have previously been used to manufacture components of engine assemblies. The greater coefficient of thermal expansion can be detrimental to the performance of some components within the engine assembly.
Data Source
AI summary
Methods and systems are provided for an engine housing assembly. In one example, an engine housing assembly comprises an engine housing component, the housing component at least partially defining a first bore for receiving a first shaft and at least partially defining a second bore for receiving a second shaft; and a reinforcement member cast into the housing, the reinforcement member having a lower coefficient of thermal expansion than the housing component, wherein the reinforcement member at least partially surrounds the first and second bores. A method of manufacturing the engine housing assembly is also provided.