Shaft Blocking Pawl Assembly for Compact EV Transmission Packaging
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Solution Overview
Problem
Existing blocking mechanisms for rotationally blocking a shaft in vehicle drivetrains face challenges in compactness, assembly complexity, and maintaining mechanical strength, particularly in restricted spaces of electric vehicle transmissions.
Innovation Solution
A blocking mechanism with a mobile pawl, a pushing device, an actuating lever, and a positioning member, where the actuating lever and positioning member are assembled along parallel axes, simplifying assembly, and the positioning member includes offset fixing surfaces and a flexible blade with a rolling element to enhance mechanical strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the blocking mechanism is designed to fit in restricted spaces, then compactness is improved, but assembly complexity increases due to non-parallel fixing axes
Solution Approach 1:
The positioning member is designed with an asymmetric structure featuring a first fixing surface and a second fixing surface offset from each other in the axial direction, allowing the fixing axes to be non-parallel while maintaining compact dimensions suitable for restricted transmission spaces
Solution Approach 2:
The offset between the first and second fixing surfaces in the axial direction creates a three-dimensional configuration that reduces the radial footprint of the positioning member, enabling compact design while simplifying assembly through parallel mounting axes
2Volume of moving object
If the positioning member is made compact, then device size is reduced, but mechanical strength decreases under mechanical loadings
Solution Approach 1:
The positioning member incorporates a flexible blade made of elastomeric material with high mechanical strength, combining the properties of flexibility and strength to maintain structural integrity under load while occupying minimal space
Solution Approach 2:
The flexible blade is strategically positioned to engage with the actuating lever at critical load points, concentrating mechanical strength where needed while keeping the overall positioning member compact
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 improves compactness, simplifies assembly, and maintains sufficient mechanical strength, enabling the blocking mechanism to effectively immobilize a vehicle while being adaptable to the restricted spaces of electric vehicle transmissions.
Implementation Method 1
The positioning member comprises a rolling element collaborating with the external periphery of the actuating lever
Implementation Method 2
The positioning member comprises an elastic device, for example in the form of a flexible blade, pressing against the external periphery of the actuating lever
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 includes a first fixing surface and a second fixing surface which are offset from one another axially.