Transmission Case Rib Configuration for Bending Resistance
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Solution Overview
Problem
Existing transmission cases with reinforcing ribs on inner and outer circumferential surfaces lack optimal arrangements to maximize strength while maintaining lightweight design, particularly at the transition section which is the weakest part.
Innovation Solution
The transmission case features a configuration with outer and inner protrusions formed at corresponding positions along the circumferential direction, interconnected by annular protrusions, forming a frame structure that enhances strength without increasing weight, and varying concentration and interval of protrusions to reinforce against bending forces, with some protrusions extending across the entire case body and housing unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcing ribs are added to increase strength, then the strength of the transmission case is improved, but the weight of the transmission case increases
Solution Approach 1:
The reinforcing structure is segmented into multiple discrete protrusions (outer protrusions on the outer surface and inner protrusions on the inner surface) rather than continuous ribs. These segmented protrusions are strategically positioned to provide strength where needed while minimizing material usage and weight
Solution Approach 2:
The protrusions are concentrated at specific locations, particularly at the transition section between the case body and housing body where bending forces are greatest. The concentration and interval of protrusions vary according to the local stress distribution, providing enhanced strength at critical areas without uniformly increasing weight throughout the entire transmission case
2Strength
If the number of protrusions is increased to improve strength, then the strength of the transmission case is improved, but the manufacturing complexity increases
Solution Approach 1:
The protrusions are arranged asymmetrically according to the actual stress distribution patterns in the transmission case. The concentration and interval of protrusions are optimized for specific loading conditions and bending force directions, rather than using a symmetric uniform pattern. This asymmetric arrangement achieves maximum strength with minimum protrusion count
Solution Approach 2:
Rather than providing uniform reinforcement throughout the entire transmission case, the invention applies reinforcement selectively at critical locations where bending forces are greatest (such as the transition section). This partial action approach achieves sufficient strength without the excessive complexity of comprehensive reinforcement
Data Source
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AI summary
A transmission case 10, configured integrally with a clutch housing unit 12 and a gear case unit 14, has outer ribs 22a and inner ribs 22b formed in plurality and extending in the longitudinal direction of the transmission case 10 at inner and outer peripheries of a transition section 13 from the clutch housing unit 12 to the gear case unit 14. The outer rib 22a and the inner rib 22b are disposed at the same positions in the circumferential-direction on the transmission case 10. An annular rib 24 is provided at the outer periphery of the transmission case 10, connecting each of the outer ribs 22a circumferentially. The annular rib 24 is configured to extend in the entire circumferential direction of the transition section 13. Thus, the transmission case 10 is configured with a high-strength frame structure, facilitating constraint of bending deformation originating at the transition section 13 from bending input operating on the transmission case 10.