Shift Lever Assembly Preventing Cable Curvature
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Solution Overview
Problem
In manual transmission shift-lever assemblies, the curving of shift cables during gear selection increases the operational force required and reduces the durability of the cables, leading to premature wear and potential operational inefficiencies.
Innovation Solution
A shift-lever assembly design that includes a lower lever rotatable forward and backward, connected to a shift cable, and an upper lever rotatable left and right, connected to a selection cable, with a lever holder and rotary shaft assembly that prevents cable curvature by using a circular hinge and bush system, allowing independent rotational axes for shifting and selecting gears.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single ball hinge is used to perform both shifting and selecting, then the device complexity is reduced, but the shift cable curves during operation which increases operational force and reduces durability
Solution Approach 1:
The single ball hinge is divided into two separate hinges: a first hinge for shifting operations and a second hinge for selecting operations. This segmentation allows each hinge to operate independently with its own cable routing, preventing cable curvature and improving durability while maintaining reasonable structural complexity
Solution Approach 2:
A cable guide structure is introduced as an intermediary component to guide the shift cable along a proper path. This mediator prevents the cable from curving during operation, reducing operational force and extending cable lifespan without adding significant complexity
2Device complexity
If a single ball hinge is used for both shifting and selecting, then the number of parts is reduced, but the operational force required increases due to cable curvature
Solution Approach 1:
The single ball hinge is divided into two separate hinges: a first hinge for shifting operations and a second hinge for selecting operations. This segmentation allows each hinge to operate independently with its own cable routing, preventing cable curvature and improving durability while maintaining reasonable structural complexity
Solution Approach 2:
A cable guide structure is introduced as an intermediary component to guide the shift cable along a proper path. This mediator prevents the cable from curving during operation, reducing operational force and extending cable lifespan without adding significant complexity
Data Source
AI summary
A shift-lever assembly of a manual transmission is provided. The assembly includes a lower lever that is rotatable forward and backward with respect to a shift-lever housing and is connected with one of a shift cable and a selection cable. Additionally, an upper lever is coupled to the lower lever to be rotatable left and right and is connected with a remaining one of the cables.