Compact Shaft Blocking Mechanism With V-Blade Pawl Positioning
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Solution Overview
Problem
Existing blocking mechanisms for rotational shafts in vehicle transmissions face challenges in compactness, assembly complexity, and maintaining mechanical strength in restricted spaces.
Innovation Solution
A blocking mechanism featuring a mobile pawl with a locking finger, a pushing device with a cam follower, an actuating lever with angular-positioning notches, and a positioning member with a flexible V-shaped blade that applies force to the actuating lever, allowing for compact design and simplified assembly while maintaining mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional blocking mechanism components are arranged in conventional configurations, then the mechanism achieves basic locking function, but the compactness is insufficient for restricted transmission spaces
Solution Approach 1:
The positioning member is integrated within the actuating lever structure, with the flexible blade nested against the external periphery of the actuating lever. This nested configuration allows the positioning function to be embedded within the existing lever mechanism, reducing overall volume while maintaining locking reliability through the engagement of the bearing surface in angular-positioning notches
Solution Approach 2:
The flexible blade is configured in a V-shape with planar walls extending axially, utilizing the axial dimension to provide positioning force. This dimensional approach allows the positioning member to engage with the actuating lever's external periphery in a way that maximizes space utilization within the restricted transmission housing while maintaining sufficient mechanical strength
2Volume of moving object
If components are fixed along non-parallel fixing axes to achieve compact arrangement, then space utilization improves, but assembly complexity increases due to multiple complex operations
Solution Approach 1:
The V-shaped flexible blade features asymmetric planar walls inclined at different angles (first angle and second angle), allowing optimized spatial arrangement of components. This asymmetric geometry enables compact positioning while maintaining engagement surfaces that align with the actuating lever's external periphery, facilitating simplified assembly despite the compact configuration
Solution Approach 2:
The flexible blade is divided into distinct functional segments: first and second planar walls for positioning engagement, and a curved wall connecting them. This segmentation allows each portion to be optimized for its specific function while maintaining overall compactness and enabling straightforward assembly operations
3Volume of moving object
If the positioning member is made compact to fit restricted spaces, then the blocking mechanism volume reduces, but the mechanical strength of the positioning member may be insufficient
Solution Approach 1:
The flexible blade employs different geometric configurations in different regions: planar walls with specific inclinations for engagement surfaces requiring strength, and a curved connecting wall for structural continuity. This local quality optimization ensures that each portion of the compact positioning member contributes to both space efficiency and mechanical strength
Solution Approach 2:
The curved wall connecting the planar walls of the flexible blade introduces curvature that distributes mechanical stresses more effectively than sharp angles. This curved geometry maintains structural integrity and mechanical strength within the compact V-shaped configuration, allowing the positioning member to withstand loads while occupying minimal space
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
The proposed solution enhances compactness by up to 60% and simplifies assembly by aligning components along parallel axes, while maintaining sufficient mechanical strength to effectively block the rotational shaft.
Implementation Method 1
a flexible blade (200) applying force, directly or indirectly, to the external periphery (300) of the actuating lever (3)
Implementation Method 2
a cam follower able to move on the cam surface in order to move the mobile pawl from the release position to the locking position
Data Source
AI summary
A blocking mechanism includes a mobile pawl mounted with the ability to pivot between a locking position and a release position. The mobile pawl includes a cam surface, a pushing device including a cam follower able to move on the cam surface in order to move the mobile pawl from the release position to the locking position, and an actuating lever moving the pushing device and including a first notch and a second notch. A positioning member engages in the first notch in the locking position and in the second notch in the release position. The positioning member including a flexible blade including a shape folded over on itself to form a V shape.