Automotive Handle Unit Resolving Shaft Dislocation
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Solution Overview
Problem
Conventional handle units for automotive trunk boards face increased part complexity and costs due to the use of separate metallic pins, and risk dislocation of rotational shafts under strong pulling forces, leading to potential operational failures.
Innovation Solution
A handle unit design where rotational shafts are integrally formed on the handle, with support and holding walls that adjust to prevent dislocation, and are molded from resin with flat bearing surfaces to enhance accuracy and reduce wear, incorporating a torsion coil spring for easy assembly and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If rotational shafts are formed integrally on a handle to reduce part complexity, then the number of parts is reduced and assembly is simplified, but the rotational shafts may be dislocated from bearings under strong pulling forces
Solution Approach 1:
The handle is divided into functional segments: support walls that provide structural framework, rotational shafts that enable rotation, and arm portions that transmit force. This segmentation allows each component to be optimized for its specific function while maintaining overall integration.
Solution Approach 2:
The bearing is designed with a cavity that receives the rotational shaft, and the support wall is positioned to contact the arm portion before the rotational shaft can be dislocated from the bearing. This preemptive structural arrangement cushions against the harmful effect of dislocation under strong pulling forces.
2Ease of manufacture
If a single metallic pin is used to connect handle and main body, then assembly is simple, but the number of parts increases and product costs increase
Solution Approach 1:
The rotational shafts are formed integrally with the handle as a single molded piece, merging what would traditionally be separate components (handle body and rotational shafts) into one unified structure. This eliminates the need for additional fasteners or assembly steps while reducing part count.
Solution Approach 2:
The integrally formed handle serves multiple functions: it provides the gripping surface, contains the rotational shafts for movement, and integrates the support walls for structural stability. This multi-functionality reduces the need for separate components and simplifies the overall design.
3Device complexity
If rotational shafts are used instead of metallic pins, then part complexity is reduced, but arm portions deflect under strong pulling forces causing rotational shaft dislocation
Solution Approach 1:
The support walls are strategically positioned to provide localized reinforcement at critical points where the arm portions connect to the handle body. This local strengthening prevents excessive deflection under load without requiring the entire handle structure to be oversized or overly robust.
Solution Approach 2:
The handle is molded from resin material that combines flexibility for rotational movement with sufficient strength to resist deflection under pulling forces. The integral molding process creates a composite structure that optimizes both strength and flexibility in different regions of the handle.
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 design reduces part complexity, prevents rotational shaft dislocation under strong forces, and ensures reliable operation with reduced wear and noise, while maintaining cost-effectiveness and ease of assembly.
Implementation Method 1
incorporating a torsion coil spring for easy assembly and operation
Data Source
AI summary
According to an aspect of the present invention, there is provided a handle unit including: a main body including: a pair of bearings; and a pair of holding walls separated from the pair of the bearings; a handle including: a pair of support walls; and a pair of rotational shafts projecting outward from the pair of support walls to be engaged with the pair of the bearings, wherein the handle is rotatable between a stored position and a operating position, wherein the support walls are formed to not face the holding walls when the handle is in the stored position, and formed to face the holding walls and contact the holding walls by being deflected when the handle is in the operating position.