Shift Lever Housing Weight Reduction via Local Quality
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Solution Overview
Problem
Conventional shift lever housings for manual transmissions are heavy and costly due to their large volume, which compromises fuel efficiency while maintaining strength, and they lack weight reduction strategies without compromising structural integrity.
Innovation Solution
The design incorporates holes in non-critical areas to reduce weight and cost, and forms ribs in weakened portions to reinforce strength, ensuring the shift lever housing maintains necessary structural integrity during gear shifting operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the shift lever housing is designed with a large volume to endure gear-shifting loads, then strength is improved, but weight increases
Solution Approach 1:
The patent applies local quality by forming holes only in non-critical areas where strength requirements are lower, while maintaining solid structure in critical load-bearing areas. This creates spatially varying material distribution that optimizes the strength-to-weight ratio by making the housing structure adaptive to local stress requirements rather than uniformly strong throughout.
Solution Approach 2:
The patent segments the housing into different regions with different structural characteristics - solid regions in high-stress areas and hollow regions in low-stress areas. This segmentation allows each region to be optimized independently for its specific functional requirements, achieving overall weight reduction without compromising critical strength properties.
2Weight of stationary object
If holes are formed in the shift lever housing to reduce weight, then weight is reduced, but strength is weakened
Solution Approach 1:
The patent applies local quality by forming holes only in non-critical areas where strength requirements are lower, while maintaining solid structure in critical load-bearing areas. This creates spatially varying material distribution that optimizes the strength-to-weight ratio by making the housing structure adaptive to local stress requirements rather than uniformly strong throughout.
Solution Approach 2:
The patent segments the housing into different regions with different structural characteristics - solid regions in high-stress areas and hollow regions in low-stress areas. This segmentation allows each region to be optimized independently for its specific functional requirements, achieving overall weight reduction without compromising critical strength properties.
3Strength
If ribs are formed in the shift lever housing to reinforce strength, then strength is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the rib reinforcement features directly into the housing mold design, allowing ribs to be formed as integral parts of the housing during the same molding process. This integration eliminates the need for separate manufacturing steps or assembly operations, thereby reducing overall manufacturing complexity despite adding structural features.
Solution Approach 2:
The rib structures serve multiple functions simultaneously - they provide structural reinforcement in areas weakened by holes, act as attachment points for internal components, and potentially serve as mounting surfaces for fasteners. This multi-functionality reduces the need for additional separate features, offsetting the added complexity.
Data Source
AI summary
A shift lever housing for a manual transmission may include a shift cable base portion sealed to not have a hole that is open downward to a bottom located between a shift cable through-hole and a shift cable connector; and a select cable base portion positioned at one side of the shift cable base portion and having a base hole that is open downward to a bottom located between a selector lever installation hole and a select cable connector.