Motor Vehicle Door Handle Arrangement with Resistance Device
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Solution Overview
Problem
Existing door handle arrangements in motor vehicles face issues with mechanical failure of the motor drive, making it difficult to open doors in case of a power outage, and require excessive force for normal operation, compromising comfort and safety.
Innovation Solution
A door handle arrangement with an electro-mechanical locking system, featuring a handle that can be moved from a rest position to a handling position using a restoring element and a resistance device, allowing for easy electrical opening with minimal effort and mechanical opening in emergency situations by increasing the actuation force requirement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a motor drive is used to extend the handle from rest position to handling position, then the handle can be automatically positioned for aerodynamic efficiency, but the handle becomes inoperable if the motor fails
Solution Approach 1:
The return element (spring) is pre-loaded to store energy that can be used to extend the handle manually if needed. This preliminary preparation of mechanical energy allows the system to function without power when necessary.
Solution Approach 2:
The system changes the operational parameters of the handle by allowing it to be moved manually against spring force when the motor is unavailable, transforming from an electrically-driven system to a mechanically-driven system.
2Reliability
If a resistance device is activated at the end of the first actuation path, then the door lock can be opened electrically with normal force, but excessive force is required for normal operation
Solution Approach 1:
The actuation path is segmented into two distinct zones: a first actuation path for normal electrical opening with low force requirement, and a second actuation path for emergency mechanical opening with high force requirement. The resistance device is selectively activated in the second zone only.
Solution Approach 2:
The resistance device applies force locally only in the second actuation path beyond the first actuation path endpoint, creating a localized resistance zone that differentiates between normal and emergency operation modes.
3Adaptability or versatility
If the handle is designed to extend beyond the actuation position for mechanical opening, then emergency access is possible, but the actuation force required increases significantly
Solution Approach 1:
The resistance device creates a preliminary counter-action (resistance force) that must be overcome before emergency mechanical opening can occur. This preliminary resistance ensures that excessive force is applied only when truly necessary.
Solution Approach 2:
The resistance device acts as an intermediary mechanism between the handle and the door lock, mediating the force transmission and ensuring that mechanical opening only occurs when sufficient force is applied to overcome the resistance.
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
Enables easy electrical door opening with normal actuation force and provides a noticeable feedback mechanism, allowing for mechanical opening when electrical power is unavailable, ensuring safety and comfort by reducing the effort required for emergency operations.
Implementation Method 1
a return element prestressing the handle (4) in the direction of the handle holder (7)
Data Source
Figure 1~7
Figure 8~11
Figure 12~16
AI summary
The invention relates to a door handle assembly (3) of a motor vehicle (2), comprising a handle bracket (7), a handle (4) and a return element (10), wherein the handle (4), when installed in a vehicle door (2), is arranged in a rest position flush with the outer surface (6) of the vehicle door (2) and, in a handling position for actuation, is arranged projecting in an opening direction (9) relative to the outer surface (6) of the vehicle door (2), wherein, for actuation, the handle (4) is designed to be movable relative to the handle bracket (7) from its handling position into an actuation position for electrically opening a door lock (5) or into an emergency actuation position for mechanically opening the door lock (5), wherein the handle (4) is coupled to the handle bracket (7) via a first and second connecting device (11, 15).and wherein a resistance device (25) is arranged within the first connecting device (11) and/or the second connecting device (15), which generates a resistance force opposing the actuation when the handle (4) is actuated from the actuating position to the emergency actuating position.