Axle Housing Rib Design for Lubricant Retention
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Solution Overview
Problem
Conventional axle assemblies experience uncontrolled loss of lubricating liquid due to splashing from moving components, which escapes through the venting bore, leading to an inadequate lubricating fluid level within the stationary housing.
Innovation Solution
Incorporating at least one rib in the stationary housing, positioned transversely to the driven axle shafts, particularly near the venting bore, to intercept and redirect splashed lubricating liquid back into the lower portion of the housing, preventing its escape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the stationary housing is provided with a venting bore to allow pressurized air to escape, then air venting function is improved, but lubricating liquid can escape through the venting bore leading to fluid loss
Solution Approach 1:
A hydrophobic coating is applied to the venting bore to create an intermediary layer that selectively allows air molecules to pass through while blocking lubricating liquid molecules. This mediator enables the venting function while preventing fluid loss through the same opening.
Solution Approach 2:
The venting bore is given a different surface property (hydrophobic coating) compared to the rest of the housing interior. This local quality change allows the venting bore to selectively interact with air versus lubricating liquid, permitting air escape while preventing liquid leakage.
2Ease of manufacture
If the interior of the stationary housing is smooth to facilitate manufacturing, then ease of manufacture is improved, but lubricating liquid can flow along the contour to the venting bore
Solution Approach 1:
Instead of making the entire housing interior rough, only specific regions (the upper portion and areas leading to the venting bore) are given a rough surface treatment. This localized quality change creates liquid barriers where needed while maintaining smooth surfaces elsewhere for ease of manufacture.
Solution Approach 2:
The rough surface structures are pre-formed as integral parts of the housing during the manufacturing process, rather than being added as separate components. This preliminary action prevents liquid flow paths before the housing is assembled, maintaining manufacturing simplicity while achieving the liquid retention function.
3Quantity of substance
If the stationary housing is made larger to accommodate more lubricating liquid, then lubrication capacity is improved, but device complexity and material usage increase
Solution Approach 1:
The natural splashing and flow of lubricating liquid, which was previously harmful by causing escape through the venting bore, is converted into a beneficial liquid barrier by the rough surface structures. The liquid that would have escaped is now retained and redirected, maintaining adequate lubrication without increasing housing size.
Solution Approach 2:
The lubricating liquid itself serves the dual function of both lubricant and liquid barrier. By utilizing the liquid's own presence and movement patterns, the system creates self-forming barriers that prevent escape without requiring additional structural elements or increasing the housing volume.
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
Maintains a consistent lubricating liquid level within the stationary housing, ensuring proper lubrication of components and preventing uncontrolled fluid loss, thereby ensuring continuous operation of the differential unit.
Implementation Method 1
a rough surface treatment in regions of the interior of stationary housing 10 that face the differential unit 16 and that extend upwardly from a lower portion of the interior toward an upper portion of the interior
Implementation Method 2
The at least one rib is arranged in the stationary housing such that lubricating liquid that is splashed on the at least one rib by the action of the moving components of the differential unit collects at the at least one rib and falls back down into the lower portion of the stationary housing
Data Source
AI summary
An axle assembly for a drive device for the road wheels of a vehicle includes: a stationary housing having a housing interior at least partially filled with a lubricating liquid; axle housings connected to the stationary housing and configured to permit axles of the vehicle to pass towards the road wheels; a venting bore in one of the axle housings configured to allow pressurized air to escape from the stationary housing; and at least one rib sized and positioned in the housing interior of the stationary housing so as to prevent migration of the lubricating liquid out of the venting bore.