Parking Device Torsion Spring Support via Fulcrum Pin Integration
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Solution Overview
Problem
Existing parking devices with torsion springs require additional shaft members to prevent spring displacement, leading to increased size and complexity.
Innovation Solution
The torsion spring is fitted directly on the fulcrum pin, with a restriction part, such as a large-diameter portion or protrusions, to prevent movement away from the parking pawl, eliminating the need for a separate shaft member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate shaft member is provided to support the torsion spring, then the torsion spring can be properly supported and positioned, but the size of the parking device increases
Solution Approach 1:
The patent combines the fulcrum pin (which supports the parking pawl) with the function of supporting the torsion spring. The torsion spring is fitted directly on the fulcrum pin, merging two support functions into a single component, thereby eliminating the need for a separate shaft member and reducing overall device size.
Solution Approach 2:
The fulcrum pin is given multiple functions: it serves as both the pivot point for the parking pawl and as the support shaft for the torsion spring. This multi-functionality allows the device to maintain reliable torsion spring support without adding extra components, thus avoiding size increase.
2Reliability
If a separate shaft member is provided to support the torsion spring, then the torsion spring can be properly positioned, but the device complexity increases
Solution Approach 1:
The patent merges the positioning function for the torsion spring into the existing fulcrum pin structure. By fitting the torsion spring directly on the fulcrum pin and using the fulcrum pin's geometry (such as a large-diameter portion or protrusions) to restrict spring movement, the design reduces component count and simplifies the overall structure.
Solution Approach 2:
The fulcrum pin itself provides the restriction function for the torsion spring through its own geometric features (large-diameter portion or protrusions), eliminating the need for separate positioning mechanisms or additional shaft members with specific geometric features.
3Reliability
If the torsion spring is fitted on a separate shaft member, then the spring can be supported, but cost increases due to additional components
Solution Approach 1:
The patent reduces manufacturing cost by merging the torsion spring support function into the existing fulcrum pin. This eliminates the need to manufacture and assemble a separate shaft member, reducing both material costs and assembly operations while maintaining reliable spring support.
Solution Approach 2:
The patent extracts the torsion spring support function from a separate shaft member and integrates it into the fulcrum pin, removing the unnecessary component and its associated manufacturing and assembly costs while preserving the essential support function.
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 configuration reduces the size of the parking device while ensuring the torsion spring remains in place, suppressing vibrations and preventing costly misalignment, thereby achieving cost reduction and downsizing.
Implementation Method 1
a torsion spring fitted on the fulcrum pin and including a first end of the torsion spring mounted on the parking pawl and a second end of the torsion spring mounted on a holding member configured to hold the fulcrum pin
Data Source
AI summary
A parking device includes a parking gear, a parking pawl, and a torsion spring. The parking gear is directly coupled to an axle. The parking pawl is pivotably supported by a fulcrum pin and provided with a claw configured to be able to mesh with a tooth space of the parking gear. The torsion spring is fitted on the fulcrum pin, with a first end of the torsion spring mounted on the parking pawl and a second end of the torsion spring mounted on a holding member that holds the fulcrum pin.