Vehicle Door Arrester with Variable Friction Contact Surfaces
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Solution Overview
Problem
Existing door arresters for vehicle doors require high force to overcome latching positions due to high pretension from compression springs, making it difficult to securely hold the door during opening and closing procedures while also requiring significant force expenditure.
Innovation Solution
A door arrester design featuring a door retaining bar with parallel and ramp-shaped contact surfaces, where contact elements with different friction coefficients are used to influence frictional forces, allowing for a lower force expenditure to overcome the ramp-shaped contact portion while maintaining a high retaining force through the parallel contact portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If high pretension is applied via compression springs in the retaining bodies, then high retaining force is achieved to securely hold the vehicle door, but high force expenditure is required to overcome the latching recesses during opening and closing movements
Solution Approach 1:
The contact surface is segmented into two distinct contact portions: a first contact portion with high friction coefficient and a second contact portion with low friction coefficient. This segmentation allows each portion to serve different functions - the first provides high retaining force while the second enables easy overcoming of latching positions, thus resolving the contradiction between high retaining force and low force expenditure.
Solution Approach 2:
Different regions of the contact surface are given different frictional properties. The first contact portion has a high friction coefficient to maximize retaining force, while the second contact portion has a low friction coefficient to minimize the force needed to overcome latching recesses. This local differentiation of quality allows simultaneous achievement of high retention and easy operation.
2Reliability
If compression springs are used to pretension retaining bodies, then reliable door retention is achieved, but the mechanism becomes more complex compared to simpler retention mechanisms
Solution Approach 1:
The invention changes the friction coefficient parameter of the contact surface in different regions rather than changing the mechanical structure complexity. By varying the friction coefficient (a physical parameter) between the first and second contact portions, the invention achieves reliable door retention with different force characteristics without adding complex mechanical components.
3Device complexity
If a single friction surface is used on the retaining body, then the structure is simple, but it cannot provide both high retaining force and low force expenditure for overcoming latching positions
Solution Approach 1:
The single friction surface is segmented into two contact portions with different friction coefficients. This segmentation allows the first contact portion to provide high retaining force while the second contact portion facilitates easy overcoming of latching positions, thus achieving force expenditure variation without significantly complicating the overall structure.
Solution Approach 2:
The contact surface exhibits local quality differentiation where the first contact portion has high friction for retention and the second contact portion has low friction for easy operation. This local quality variation enables the surface to perform multiple functions simultaneously while maintaining structural simplicity.
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 door arrester achieves a high retaining force with reduced force expenditure by utilizing contact elements with varying friction coefficients, enabling secure door retention during opening and closing with lower operational force.
Implementation Method 1
a compression spring which, in a pretensioning fashion, acts in the direction of the door retaining bar
Implementation Method 2
contact elements with different coefficients of friction relative to the operative connection with the contact surface of the door retaining bar
Data Source
AI summary
A door arrester for vehicle doors of motor vehicles, comprising a retaining part for fastening to a door or door pillar and a housing. A door retaining bar passes through a through-opening in the housing in a longitudinally displaceable manner. The door retaining bar is pivotably fastened to the door or door pillar and has a contact surface which comprises at least one first contact portion and at least one ramp-shaped second contact portion. At least one retaining body is pretensioned in the direction of the door retaining bar by a spring element and guided in the housing. The retaining body comprises at least two contact elements, wherein the contact elements have different coefficients of friction relative to the operative connection with the contact surface of the door retaining bar.