Vehicle Transmission Locking Mechanism With Parallel-Axis Assembly
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Solution Overview
Problem
Existing blocking mechanisms for vehicle transmission trees face challenges in compactness, assembly complexity, and maintaining mechanical resistance in limited spaces, particularly in electric vehicle transmissions.
Innovation Solution
A blocking mechanism with a mobile ratchet, thrust device, actuation lever, and positioning body, where the actuation lever and positioning body are assembled using parallel axes, simplifying assembly and allowing for compact design while maintaining mechanical resistance through a flexible blade and rolling element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the locking mechanism uses a positioning member with fixing surfaces offset from each other in a direction parallel to the actuation axis, then the assembly is simplified and compactness is improved, but the mechanical strength of the positioning member may be compromised
Solution Approach 1:
The positioning member uses two fixing surfaces offset in the axial direction (parallel to actuation axis) rather than offset radially, changing the dimension of fixation. This allows the positioning member to be mounted between two parallel surfaces of the transmission housing, simplifying assembly while maintaining structural integrity through proper axial positioning.
Solution Approach 2:
The positioning member acts as an intermediary element that translates the rotational motion of the actuating lever into linear motion of the thrust device. By positioning it axially offset from the actuation axis, it mediates between the rotational and linear motion components without compromising its positioning function or mechanical strength.
2Volume of moving object
If the locking mechanism is designed for compactness to accommodate limited spaces in electric vehicle transmissions, then the available space is optimized, but the assembly complexity increases due to non-parallel fixing axes
Solution Approach 1:
The positioning member is designed with fixing surfaces offset axially rather than radially, allowing it to be installed between parallel surfaces of the transmission housing. This dimensional arrangement optimizes space utilization while keeping all fixing axes parallel, thereby simplifying assembly operations.
Solution Approach 2:
The positioning member serves multiple functions: it positions the actuating lever, maintains the bearing surface engagement with positioning notches, and provides structural support. By consolidating these functions into a single component with axial offset fixing surfaces, the design achieves compactness without increasing assembly complexity.
3Strength
If the positioning member uses a flexible blade structure to maintain mechanical resistance, then the mechanical strength is sufficient, but the assembly complexity increases
Solution Approach 1:
The positioning member utilizes elastic deformation parameters of a flexible blade to achieve mechanical resistance. By carefully selecting the blade's dimensions, material properties, and offset distance between fixing surfaces, the design maintains sufficient strength while allowing simple assembly through elastic compliance rather than complex mechanical adjustments.
Solution Approach 2:
The flexible blade structure of the positioning member allows it to self-adjust during assembly through elastic deformation, automatically accommodating minor misalignments and maintaining proper engagement with the actuating lever. This self-adjusting capability eliminates the need for complex alignment procedures or adjustment mechanisms.
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 enhances compactness and simplifies assembly while maintaining sufficient mechanical resistance, making it suitable for the limited spaces in modern vehicle transmissions.
Implementation Method 1
a positioning member (2) cooperating with the external periphery (300) of the actuating lever (3), said positioning member (2) comprising a bearing surface (204) configured to engage in the first angular positioning notch (301) when the movable pawl (34) is in the locked position and in the second angular positioning notch (302) when the movable pawl (34) is in the released position; the positioning member (2) comprising a first fixing surface (201) and a second fixing surface (202) offset from each other in a direction parallel to the actuation axis (Y2)
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a locking mechanism comprising: - a movable pawl (34) pivotally mounted between a locking position and a released position, the movable pawl comprising a cam surface (36); - a push device (38) comprising a cam follower (42) moving on the cam surface to move the movable pawl from the released position to the locking position; - an actuating lever (3) moving the push device and comprising a first notch and a second notch; - a positioning member (2) engaging in the first notch in the locking position and in the second notch in the released position; the positioning member comprising a first fixing surface and a second fixing surface offset from each other axially.