Transmission Mounting Member Abutment Support
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Solution Overview
Problem
Conventional transmissions with planetary gear mechanisms face challenges in supporting multiple shafts with a short inter-shaft distance, leading to reduced case thickness and increased load on the case, requiring enhanced structural strength to handle gear meshing loads.
Innovation Solution
A transmission design that incorporates a mounting member with an abutment support portion to stabilize the inter-shaft portion between the first and second input shafts, utilizing the rigidity of both the mounting member and the case to maintain stability and support loads, while maintaining a short inter-shaft distance, and includes fixing members to secure the mounting member to the case, ensuring the abutment support portion is fixed on both sides and intersects with the line connecting the shaft centers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the inter-shaft distance between the shift shaft and counter shaft is shortened to minimize transmission size, then the case thickness between supporting bearings is reduced, but the case strength becomes insufficient to handle gear meshing loads
Solution Approach 1:
The support function is segmented between two distinct components: the case provides primary support, while the mounting member provides additional support. This segmentation allows the case to maintain reduced thickness for size reduction while the mounting member compensates for the strength deficiency, resolving the contradiction between compact size and sufficient load-bearing capacity
Solution Approach 2:
The mounting member acts as an intermediary component between the ring gear and the case. It transmits and distributes the gear meshing loads, providing additional support to the inter-shaft portion without requiring the case itself to be thicker, thus enabling size reduction while maintaining strength
2Weight of moving object
If the inter-shaft distance is shortened to achieve weight reduction, then the case thickness is reduced, but the case requires larger strength to support the loads from gear meshing
Solution Approach 1:
The support function is divided between the case and the mounting member, allowing the case to be thinner and lighter while the mounting member provides the additional strength needed to handle gear meshing loads, thus resolving the contradiction between weight reduction and strength maintenance
Solution Approach 2:
The support structure forms a composite system combining the case and the mounting member working together. This composite structure provides the necessary strength for load bearing while allowing individual components to be optimized for weight, resolving the contradiction between lightweight design and sufficient strength
Data Source
AI summary
Provided a transmission including a first shaft, a second shaft connected thereto via a shift gear mechanism provided to a first shaft and generating a rotary output corresponding to a selected shift gear, a planetary gear mechanism, a transmission case for housing the planetary gear mechanism and a mounting member for fixing a ring gear of the planetary gear mechanism to the case. To the mounting member, an abutment support portion is formed for supporting the case by abutting to an inter-shaft portion positioned between the first shaft and the second shaft in the case.