Hydraulic Drive Assembly Valve Actuating Vehicle Doors
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Solution Overview
Problem
Existing hydraulic drive assemblies for vehicle doors and hatches lack improved actuating characteristics, increased accuracy, and high operational reliability, particularly in enabling both hydraulically induced and manual movement while maintaining a compact structural design.
Innovation Solution
A hydraulic drive assembly with a valve assembly that has different operating positions, allowing for the hydraulic loading of piston-cylinder units to be changed through connections established, interrupted, or altered by the valve assembly, incorporating a stronger throttling effect in discharge connections to influence movement forces and prevent play, and featuring a compensation chamber to manage fluid volume changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hydraulic drive assembly is designed to enable both hydraulic and manual operation, then operational versatility is improved, but device complexity increases due to the need for valve assemblies and multiple connection paths
Solution Approach 1:
The valve assembly is designed with multiple operating positions that enable different connection configurations, allowing the same hydraulic circuit to support both hydraulic actuation mode and manual actuation mode. The valve assembly universally handles both operation types through its ability to establish different hydraulic pathways.
Solution Approach 2:
The valve assembly can dynamically switch between different operating positions to change the hydraulic connection configuration. This dynamic reconfiguration allows the system to adapt between hydraulic and manual operation modes as needed, providing operational flexibility without requiring separate fixed circuits.
2Measurement precision
If throttling effects are strengthened in discharge connections to control movement forces and prevent play, then actuating accuracy is improved, but energy loss increases due to restricted fluid flow
Solution Approach 1:
The throttling effect is applied selectively and locally in the discharge connections rather than uniformly throughout the entire hydraulic circuit. This localized throttling allows precise control of movement forces and elimination of play at critical points while minimizing overall energy loss in the system.
Solution Approach 2:
The valve assembly can change the throttling parameters in discharge connections by switching between different operating positions. This allows the system to adjust the degree of throttling based on operational requirements, optimizing the balance between actuating accuracy and energy efficiency for different operating conditions.
3Measurement precision
If a valve assembly with multiple operating positions is implemented to control hydraulic loading, then actuating accuracy is improved, but device complexity increases due to additional components and control mechanisms
Solution Approach 1:
The valve assembly combines multiple functions into a single integrated component. It simultaneously controls hydraulic connections to piston-cylinder units, manages discharge connections with throttling effects, and enables both hydraulic and manual operation modes, thereby reducing the need for separate control components.
Solution Approach 2:
The valve assembly serves multiple purposes: it controls hydraulic actuation, enables manual operation, manages fluid flow paths, and provides throttling control. This multi-functionality allows a single component to achieve improved actuating accuracy without requiring proportionally more separate components.
4Manufacturing precision
If discharge connections incorporate stronger throttling effects to influence movement forces, then positioning precision is improved, but device complexity increases due to modified connection design
Solution Approach 1:
The throttling effect is implemented locally in the discharge connections rather than throughout the entire system. This localized modification allows precise control of positioning by affecting fluid flow at the critical discharge point while keeping the rest of the hydraulic circuit relatively simple.
Solution Approach 2:
The valve assembly is pre-configured with different operating positions that establish predetermined throttling effects in discharge connections. This preliminary design allows the system to achieve positioning precision through pre-planned fluid flow control pathways without requiring complex real-time adjustments.
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 actuating accuracy and reliability by controlling movement forces and preventing play, allowing for both hydraulic and manual operation with improved compactness and operational reliability.
Implementation Method 1
a first hydraulic piston-cylinder unit (4; 5) and a second hydraulic piston-cylinder unit (4; 5), which are coupled to the vehicle door or hatch (39) for drive purposes
Implementation Method 2
a valve assembly (6), which has connections, namely a connection (10; 13), which is connected to a first hydraulic supply line (11; 14), a connection (10; 13), which is connected to a second hydraulic supply line (11; 14), a connection (21; 22), which is connected to the first piston-cylinder unit (4; 5), and a connection (21; 22), which is connected to the second piston-cylinder unit (4; 5)
Implementation Method 3
incorporating a stronger throttling effect in discharge connections to influence movement forces and prevent play
Implementation Method 4
featuring a compensation chamber to manage fluid volume changes
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a hydraulic drive assembly (1) for a vehicle door or vehicle flap (39). According to the invention, the piston-cylinder units (4, 5) are actuated via a slide valve (8). The slide valve (8) has a neutral operating position in which it directly connects the pressure chambers (25, 26) of the piston-cylinder units (4, 5), thus enabling manual movement of the vehicle door or vehicle flap (39). If control ports (27, 28) of the slide valve (8) are actuated differently via a reversible pump (2), the slide valve (8) switches to a first or second operating position. In the first operating position, a pressure chamber (25) is actuated via an unthrottled supply connection (43), while a pressure chamber (26) is connected to a suction side of the pump (2) via a throttled discharge connection (44).The opening or closing force for the vehicle door or vehicle flap (39) can be influenced by the throttling effect of the discharge connection (44).