Final Gear Structure Weight Reduction via Ring Gear Shaft Segmentation
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Solution Overview
Problem
The existing final gear structures in power transmission mechanisms are heavy due to the requirement for rigidity in the output shaft member, which transmits power to the drive wheel, making it challenging to achieve a lightweight design.
Innovation Solution
The final gear structure incorporates a ring gear shaft supported in a sandwiched manner between the wheel and the ring gear, with a stud bolt penetrating the shaft, and a disc mounting member that houses the brake disc, allowing for power transmission through the stud bolt, reducing the torque received by the shaft and enabling a lightweight design by using an aluminum alloy and a stepwise diameter reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the output shaft member is designed with sufficient rigidity to withstand drive wheel power, then power transmission reliability is improved, but the weight of the output shaft member increases
Solution Approach 1:
The output shaft member is divided into a ring gear shaft (53) and a disc mounting member (96), which are separate components. The ring gear shaft is supported by bearings (66, 67) at both ends, segmenting the load paths and allowing each component to be optimized independently for strength and weight.
Solution Approach 2:
The function of supporting the drive wheel is extracted from the output shaft member by introducing a disc mounting member (96). The stud bolt (55) directly connects the ring gear (64) to the disc mounting member, removing the need for the output shaft member to bear the full load, thus enabling weight reduction.
2Weight of moving object
If the output shaft member is made lightweight, then the overall weight of the final gear structure is reduced, but the rigidity and load-bearing capacity deteriorate
Solution Approach 1:
The ring gear shaft (53) and disc mounting member (96) are combined into an integrated assembly supported by bearings at both ends. This merging creates a stable structure where the bearing-supported configuration provides the necessary rigidity and load-bearing capacity, allowing the use of lightweight materials without compromising strength.
Solution Approach 2:
The bearing-supported configuration acts as an intermediary between the ring gear and the drive wheel assembly. The bearings (66, 67) mediate the load transmission, allowing the ring gear shaft to be lightweight while still maintaining sufficient load-bearing capacity through the bearing support system.
3Strength
If multiple separate components are used for mounting the brake disc and supporting the ring gear, then the load distribution is improved, but the number of parts increases
Solution Approach 1:
The disc mounting member (96) is designed as an integrated component that combines the functions of mounting the brake disc and supporting the ring gear shaft assembly. This merging reduces the number of separate parts while maintaining the load distribution benefits through the bearing-supported configuration and the stud bolt connection system.
Data Source
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AI summary
To provide the final gear structure which can make realize the reduction of weight thereof. In the final gear structure which includes: a bevel gear shaft 63 on which a bevel gear is formed; and a ring gear 64 which meshes with the bevel gear and mounts a wheel 45 which constitutes a rear wheel 42 on a ring gear 64 side, a stud bolt 55 for mounting the wheel 45 on a ring gear 64 side is provided, a ring gear shaft 53 which is rotatably supported on a gear case 61 is provided in a sandwiched manner between the wheel 45 and the ring gear 64, and the stud bolt 55 penetrates the ring gear shaft 53.