Shaft Blocking Mechanism With Simplified Guide Rail Positioning
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Solution Overview
Problem
Existing blocking mechanisms for vehicle shafts are difficult to manufacture due to complex guide rail shapes and require extensive machining, leading to imprecise positioning and high material usage.
Innovation Solution
A blocking mechanism with a guide rail that includes a positioning wall and guide wall, allowing precise positioning through a simple machining operation, reducing material usage and manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the guide rail has a complex shape with multiple bent walls to ensure positioning, then the positioning precision is improved, but the manufacturing complexity and difficulty increase
Solution Approach 1:
The guide rail is divided into two independent components: a positioning element with simple geometric features and a guide wall. The positioning element contains positioning surfaces that interface with the housing, while the guide wall provides the guiding function. This segmentation allows each component to be optimized independently, reducing overall complexity while maintaining positioning precision.
Solution Approach 2:
The positioning function is extracted from the complex bent wall structure and implemented through dedicated positioning surfaces on the positioning element. This separation allows the positioning geometry to be simplified while the guide rail maintains its guiding function through the guide wall, reducing manufacturing complexity without sacrificing positioning accuracy.
2Manufacturing precision
If the guide rail has a complex shape with multiple bent walls, then the positioning function is achieved, but the quantity of material to be machined increases
Solution Approach 1:
By segmenting the guide rail into a positioning element and guide wall, the positioning surfaces are created on a separate element that can be manufactured with minimal material removal. The housing contains simple positioning features that require little machining, significantly reducing the total material removal compared to machining complex bent walls directly into the housing.
Solution Approach 2:
The positioning function is extracted and implemented through the positioning element with its positioning surfaces, rather than through complex housing features. This extraction reduces the material removal requirement in the housing while maintaining the necessary positioning precision through the dedicated positioning element geometry.
3Manufacturing precision
If the guide rail is positioned by fitting into a housing with multiple machined faces, then the positioning function is achieved, but the number of machining operations increases
Solution Approach 1:
The positioning function is segmented into the positioning element with positioning surfaces and the housing with corresponding positioning features. This segmentation reduces the number of machined faces required in the housing, as the positioning element provides the primary positioning geometry, thereby reducing the total number of machining operations needed.
Solution Approach 2:
The positioning function is extracted from the housing and implemented through the positioning element. This extraction reduces the machining requirements in the housing, decreasing the number of machining operations and improving manufacturing efficiency while maintaining positioning precision through the dedicated positioning element.
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 solution ensures precise positioning and reduced wear, lowering production costs while maintaining robustness and preventing damage from excessive loads.
Implementation Method 1
an actuator that moves a pushing device, the pushing device including a cam follower able to move on the cam surface to move the movable pawl from the release position to the locking position
Implementation Method 2
the movable pawl being pivotingly mounted in a plane about a pivot axis on the transmission casing between a locking position in which the locking finger is engaged in the locking recess and a release position in which the locking finger is disengaged from said locking recess
Implementation Method 3
a guide rail including a guide wall guiding the movement of the pushing device
Data Source
AI summary
A blocking mechanism includes a transmission casing and a movable pawl having a locking finger. The movable pawl is pivotingly mounted about an axis on the transmission casing between a locking position in which the locking finger is engaged in the locking recess and a release position in which the locking finger is disengaged from said locking recess, the movable pawl including a cam surface. An actuator that moves a pushing device guided by a guide rail, wherein the pushing device includes a cam follower able to move on the cam surface. A housing is formed in the transmission casing including a positioning slot in which a wall of the guide rail is inserted.