Transfer Case Mating Surface Repositioning for Miniaturization
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Solution Overview
Problem
Existing power transmission apparatuses face challenges in miniaturization, as the enlargement in the width direction due to bolt holes and protrusion of the transfer case makes it difficult to reduce the overall size, affecting vehicle mount capability and inertia resistance.
Innovation Solution
The design incorporates a hollow stepped connecting hollow shaft with press-fitting and welding of the ring gear, and strategically positioned mating surfaces within the transfer case to minimize axial protrusion, allowing for a smaller transfer case and reduced inertia resistance, while maintaining support stability and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the mating surfaces are positioned at the outer periphery side of the bearing to allow bolt holes to be formed in the thickness part, then the bolts can be properly screw-engaged, but the transfer case protrudes outward in the width direction and is enlarged
Solution Approach 1:
The patent repositions the mating surfaces from the outer periphery side to the inner side in the width direction, changing the spatial dimension where bolting is performed. This allows bolt holes to penetrate through the case body thickness without requiring outward protrusion, thereby reducing the transfer case width while maintaining proper bolt engagement capability
2Volume of moving object
If the mating surfaces are moved inwards in the width direction to suppress enlargement, then the transfer case size is reduced, but it becomes difficult to form bolt holes that penetrate through the thickness part
Solution Approach 1:
The patent creates a localized thickened portion at the inner side of the case body in the width direction, specifically where the mating surfaces are positioned. This local thickness increase enables bolt holes to be properly formed and penetrate through the case body, while the rest of the transfer case maintains a compact size without unnecessary protrusion
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
This approach enables the miniaturization of the transfer case, improving vehicle mount capability and reducing vibration, while maintaining the structural integrity and efficiency of torque transfer.
Implementation Method 1
The first case member and the second case member are joined with each other at mating surfaces of the first case member and the second case member
Data Source
AI summary
A power transmission apparatus includes a case having a first member and a second member. A first shaft extending in a first direction and a second shaft extending in a second direction intersecting with the first direction are accommodated in the case. A fastener for fastening the first member and the second member to each other is inserted through a hole formed in the first member. A bearing support part for supporting the second shaft is formed in the first member. In a third direction perpendicular to both of the first direction and the second direction, a whole of the hole is positioned in one side in the third direction than an inner peripheral end of the bearing support part in the one side in the third direction.