Plastic Door Checker Housing Merging Components
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Solution Overview
Problem
Conventional door checker devices for vehicles are complex, leading to increased weight, cost, and assembly difficulties due to numerous components, which affect the operation and merchantability of vehicle doors.
Innovation Solution
A simplified door checker apparatus with a checker arm, sliders, and an elastic member, where the checker case is injection-molded with plastic, reducing the number of components and using a snap-fit connection, and incorporating a grease pocket for lubrication, to optimize door operation and reduce weight and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the checker housing is made of steel material with multiple components, then the structural strength and durability are improved, but the assembly difficulty, weight, and manufacturing cost increase
Solution Approach 1:
The patent combines multiple separate steel components (housing, pressing member support, stopper housing) into a single integrated plastic checker housing. This merging of functions into one component reduces the number of parts from three or more to one, simplifying assembly while maintaining structural integrity through the plastic material's design features such as ribs and reinforcement structures.
Solution Approach 2:
The plastic checker housing serves multiple functions simultaneously: it provides structural enclosure, supports the pressing member mechanism, houses the stopper, and provides mounting interfaces. This multi-functionality consolidates what would traditionally require separate steel components, reducing complexity while maintaining all necessary structural and functional capabilities.
2Stability of the object's composition
If multiple steel components are used in the checker housing, then the structural integrity is maintained, but the manufacturing cost and assembly time increase
Solution Approach 1:
By merging multiple steel components into a single plastic housing, the patent eliminates the need for multiple assembly steps involving fasteners, seals, and alignment procedures. The single-component design allows for rapid installation as one unit, dramatically improving assembly efficiency while the internal rib structures and reinforcement features maintain structural integrity.
Solution Approach 2:
The plastic housing is manufactured as a complete, pre-assembled unit with all necessary features (mounting holes, pressing member slots, stopper housing) integrated during the molding process. This preliminary creation of the complete assembly eliminates the need for subsequent assembly operations, improving productivity while ensuring structural integrity is built-in from manufacturing.
3Reliability
If traditional steel components are used, then the durability is ensured, but the vehicle weight and manufacturing cost increase
Solution Approach 1:
The patent changes the material parameter from steel to plastic, which has inherently lower density and weight. This material substitution reduces the weight of the door checker assembly while the plastic formulation and structural design (with reinforcement ribs and thick-walled sections) ensure that durability and reliability are maintained at levels comparable to traditional steel components.
4Adaptability or versatility
If multiple components are assembled, then the functionality is complete, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent merges multiple functional components into a single plastic housing that provides enclosure, support, and actuation functions. This single-component design simplifies manufacturing by eliminating the need for separate production and assembly of multiple parts, reducing manufacturing complexity and cost while maintaining complete functionality through integrated design features.
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 the operation feeling and merchantability of vehicle doors by simplifying the apparatus, reducing weight and cost, and improving productivity through optimized door opening and closing functionality.
Implementation Method 1
an elastic member configured to elastically support the slider
Implementation Method 2
a grease pocket configured to store fluid to lubricate between the checker arm and the slider
Implementation Method 3
The base may be coupled to the cover by a snap-fit connection
Data Source
AI summary
A door checker apparatus for a vehicle configured for realizing an optimized operation of opening or closing, of a door when the door is opened or dosed, may include a checker arm having a first end portion connected to the vehicle body and a second end portion connected to the door, a slider provided to be movable with respect to the checker arm, an elastic member configured to elastically support the slider, and a checker case accommodating the slider and the elastic member and provided to be movable with respect to the checker arm, wherein the checker case is injection-molded with a plastic material.