Hydraulic Door Damping with Selective Flow Control
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Solution Overview
Problem
Conventional door units with mechanical damping devices are inflexible regarding the angle covered by the door leaf and have complex structural designs, limiting their usability and functionality.
Innovation Solution
A door unit with a chamber filled with a hydraulic medium and a displacement body, where the chamber communicates selectively with an opening channel and an overflow channel through a three-way valve, allowing for adjustable damping characteristics by controlling the flow through either channel, enabling stepless locking and end-position cushioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical damping device is used, then the door unit has simple structure, but it is inflexible regarding the angle covered by the door leaf
Solution Approach 1:
The patent replaces mechanical damping with a hydraulic damping device. A displacement body moves within a chamber filled with hydraulic medium, and the damping force is generated by the hydraulic fluid's resistance to flow through controlled channels (opening channel with throttle and overflow channel with check valve). This hydraulic system enables flexible control of door leaf angle while maintaining reasonable structural complexity.
Solution Approach 2:
The damping device incorporates dynamic elements including a displacement body that moves with the door leaf, a three-way valve that dynamically switches between different flow paths, and adjustable throttle elements. These dynamic components allow the system to adapt to different operating conditions and door angles, providing versatility without excessive structural complexity.
2Adaptability or versatility
If a hydraulic damping device with multiple channels is used, then different damping levels can be achieved, but the structural design becomes complex
Solution Approach 1:
The hydraulic damping device segments the flow paths into distinct channels: an opening channel with a throttle for controlled damping and an overflow channel with a check valve for free flow. The three-way valve further segments the control by selectively connecting these channels. This segmentation allows different damping levels to be achieved through simple flow path selection rather than complex control mechanisms.
Solution Approach 2:
The three-way valve acts as an intermediary control element that selectively connects the displacement body chamber to either the opening channel or the overflow channel. This intermediary component simplifies the overall control system by using a single valve to manage multiple flow paths, avoiding the need for multiple separate control mechanisms.
3Adaptability or versatility
If the chamber has semicircular shape in cross section, then the door leaf can cover maximum of 180°, but the structural design is complex and usage is restricted
Solution Approach 1:
The system uses dynamic flow path selection through the three-way valve to enable the door leaf to cover a wider angle range. By switching between the opening channel (for controlled damping at smaller angles) and the overflow channel (for free flow at larger angles), the system adapts to different door positions without requiring a complex semicircular chamber structure.
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 allows for easy implementation of different damping levels and a simple design, providing flexible damping characteristics based on the door leaf's opening angle, ensuring minimal resistance during 'load-free movement', stepless locking, and gradual deceleration at the end position, enhancing the door unit's operational efficiency and compactness.
Implementation Method 1
a damping device (8), which has a chamber (6, 7) filled with a hydraulic medium and a displacement body (5) that can be moved in at least one direction in the chamber
Implementation Method 2
the chamber communicates selectively with a check valve in an opening channel and an overflow channel parallel thereto
Implementation Method 3
the check valve is preceded by a throttle in the direction of flow
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
The invention relates to a door unit, in particular a motor vehicle door unit, with a damping device (8) which has a chamber (6, 7) which is filled with a hydraulic medium, and a displacement body (5) which is movable in at least one direction in the chamber (6, 7), wherein the displacement body (5) is acted upon by a driveshaft (4) following the movement of the door wing (1), and the chamber (6, 7) alternatively communicates with an opening valve (12) in an opening channel (10) and with an overflow channel (11) parallel to the latter.