Manual Transmission Control Lever Unfixing Mechanism
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Solution Overview
Problem
Existing manual transmissions for vehicles require direct access to a fixation jig to unfix the control lever, limiting the compactness of the engine room due to the need for a handling space, which restricts the arrangement of parts.
Innovation Solution
A manual transmission design that includes an engagement arm, a retention member, and a retention release device with a support member and urging member, allowing the control lever to be unfixed without directly operating the fixation jig by turning the lever to a different position, enabling the retention member to disengage and move to a retracted position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixation jig is used to fix the control lever at the connecting position, then the control lever can be securely fixed, but a handling space must be provided to allow direct access to the fixation jig for unfixing operations
Solution Approach 1:
The control lever itself serves as the operation element for unfixing. When the control lever is moved from its fixed connecting position, it automatically triggers the unfixing of the retention member through the cable connection, eliminating the need for separate manual operation of the fixation jig
Solution Approach 2:
The cable acts as an intermediary mechanism that transmits the movement of the control lever to the retention member. The cable connection between the control lever and retention member enables indirect operation, allowing the control lever to unfix itself without direct access to the fixation jig
2Device complexity
If direct access to the fixation jig is required for unfixing operations, then the fixation mechanism can be simple and reliable, but the engine room layout is constrained and compactness is reduced
Solution Approach 1:
The fixing and unfixing functions are merged into a single integrated mechanism. The control lever and retention member work together as a unified system where the same component (control lever) that is fixed also performs the unfixing operation through its movement, eliminating the need for separate access mechanisms
Solution Approach 2:
The retention member is nested within the control lever assembly, with the retention member positioned to engage with the control lever at the connecting position. This nested arrangement allows the fixation mechanism to be compact and integrated within the existing control lever structure, reducing space requirements in the engine room
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design allows the control lever to be unfixed without direct access to the fixation jig, increasing the freedom in arranging parts within the engine room and enhancing its compactness by eliminating the need for a handling space.
Implementation Method 1
a coil spring wound around an outer periphery of the support shaft with one end retained on the retention member and the other end retained on the base part or the case to urge the retention member toward the retracted position
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A manual transmission includes an engagement arm 32 that is provided on a select control lever 22, a retention member 86 that retains the engagement arm 32 to fix the lever 22 at a first select turning position, and a retention release device 88 by which the retention member 86 is disengaged when the lever 22 is turned to a fourth select turning position. The lever 22 can be unfixed without directly operating the engagement arm 32 and the retention member 86, because the retention member 86 that fixes the lever 22 can be disengaged by operating a shift lever 50. It is not necessary to provide a space in which unfixing work can be performed in an engine room, thus making the engine room compact.