Motor Vehicle Door Unit With Switchable Freewheel
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Solution Overview
Problem
Existing door units for motor vehicles are technologically complex and require increased operating forces, contradicting modern comfort requirements, while aiming to allow smooth door movement and optional fixation without causing collisions with obstacles.
Innovation Solution
A door unit with a movable switching element relative to a holding element within the freewheel unit, interacting with a damping element that changes positions based on drive shaft speed, allowing unhindered pivoting or blocking of the door leaf, utilizing a switchable freewheel unit with freewheel elements that can be stored in a cage, and actuated by the door leaf's force and speed without external drives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blocking mechanism is used to prevent door collisions, then safety is improved, but device complexity increases
Solution Approach 1:
The patent combines the blocking mechanism with the existing drive shaft and coupling member into a single integrated assembly. The coupling member with variable closing force is merged with the drive shaft, eliminating the need for separate blocking devices and reducing overall system complexity while maintaining collision prevention functionality
Solution Approach 2:
The coupling member serves multiple functions: it transmits motion from the drive shaft, provides variable closing force through spring pressure, and acts as a blocking mechanism when obstacles are detected. This multi-functionality eliminates the need for separate dedicated blocking devices, reducing device complexity while improving safety
2Reliability
If a blocking mechanism is used to prevent door collisions, then safety is improved, but operating forces increase
Solution Approach 1:
The coupling member's closing force is made variable through spring pressure that can be adjusted based on operating conditions. The spring force dynamically adapts to provide sufficient blocking capability when needed while reducing resistance during normal door operation, thereby maintaining safety without increasing overall operating forces
Solution Approach 2:
The patent changes the parameter of closing force from fixed to variable by using spring pressure. The spring constant and pre-compression can be optimized to provide high blocking force when obstacles are present while requiring minimal force during normal door movement, resolving the contradiction between safety and operating force requirements
3Reliability
If a coupling member with variable closing force is used, then door locking reliability is improved, but device complexity increases
Solution Approach 1:
The coupling member with variable closing force is integrated directly into the drive shaft assembly, merging the locking mechanism with the motion transmission system. This eliminates the need for separate locking devices and reduces overall device complexity while maintaining improved door locking reliability
Solution Approach 2:
The coupling member simultaneously provides motion transmission from the drive shaft and variable closing force for reliable door locking. By combining these functions in a single component, the patent achieves improved locking reliability without proportionally increasing device complexity
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 provides a structurally simple and cost-effective mechanism for stepless door locking, allowing the door leaf to move freely or be blocked as needed, enhancing user comfort and reducing operational complexity.
Implementation Method 1
interacting with a damping element which, when a certain minimum/ Limit speed of the drive shaft carries out an associated movement of its housing
Data Source
Figure 1
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AI summary
The invention relates to a door unit, especially a motor vehicle door unit, comprising a movement transfer member (3, 4) connected to a door leaf (1) and provided with a drive shaft (4) and a coupling member (5) acted on by the drive shaft (4) and having a variable closing force. The coupling member (5) is provided with a switchable free-wheel unit (12, 13, 15).