Integrally Molded Power Transmission Center Support
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Solution Overview
Problem
Conventional power transmission apparatuses face challenges in enhancing the strength of the center support, leading to potential deformation and increased gear noise when transmitting power between the counter drive gear and counter driven gear.
Innovation Solution
The power transmission apparatus incorporates a supporting member with a cylindrical drum portion that is integrally molded with the boss and annular wall portions, providing enhanced strength and reducing gear noise by acting as both a brake drum and a rib, while also reducing the number of components and apparatus size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a cutout portion is formed in the wall portion of the center support to avoid interference with the counter driven gear, then the gear meshing is enabled, but the strength of the center support is reduced and deformation occurs under load
Solution Approach 1:
The invention merges the center support and brake drum into a single integrated component. The brake drum is formed as an integral part of the center support, eliminating the need for separate brake drum components and fastening operations. This integration maintains the full strength of the center support structure while providing the necessary cutout portions for gear meshing, as the unified structure distributes loads more effectively compared to assembled components.
Solution Approach 2:
The center support is designed to perform multiple functions simultaneously: it provides structural support for the counter drive gear, serves as a mounting surface for bearings, incorporates brake drum functionality with integrated cutout portions for gear meshing, and acts as a load-bearing component. This multi-functional design eliminates the need for separate components and fastening members, thereby maintaining strength while enabling gear operation.
2Device complexity
If multiple separate components (center support, brake drum, fastening members) are used, then assembly and maintenance become complex, but the structural integrity may be compromised
Solution Approach 1:
The invention combines multiple previously separate components (center support, brake drum, and fastening members) into a single integrated center support component. The brake drum is formed as an integral part of the center support body, eliminating the need for separate fastening members to attach the brake drum. This reduction in component count simplifies assembly and maintenance while the integrated structure maintains full structural strength without the weak points introduced by multiple joints and fasteners.
Data Source
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AI summary
In a power transmission apparatus (20), a drum portion (110) that functions as a brake drum of a brake (B1) that fixes a second sun gear of a second planetary gear mechanism to a transmission case (22) so as to be rotatable is integrally molded with a supporting member (100) that is fixed to the transmission case (22) via a bolt (99) and supports a counter drive gear (41) so as to be rotatable. The drum portion (110) also functions as a rib since the cylindrical drum portion (110) is integrally molded with the supporting member (100) that supports the counter drive gear (41). Thus, it is possible to enhance the strength of the supporting member (100).