Door Drive Piston Pump for Low-Leakage, Quiet Pressure
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Solution Overview
Problem
Existing door drives, particularly those with hydraulic damping, pose challenges for disabled individuals, the elderly, and autonomous vehicles due to the need for additional force to pre-tension closing springs, and conventional hydraulic pumps fail to meet requirements of low leakage, high pressure, small size, and low noise.
Innovation Solution
A door drive with a hydraulic pump designed as a piston pump using a threaded connection to displace a pump piston axially, eliminating complex components and ensuring low leakage and compact design, while generating high pressures and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hydraulic pumps (gear pumps or vibration pumps) are used, then the door drive can be operated, but the leakage rate is high and the installation space requirement is large
Solution Approach 1:
The patent replaces conventional gear pumps or vibration pumps with a piston pump that uses a piston moving in a cylinder, driven by a threaded connection to a drive shaft. This mechanical substitution achieves lower leakage rates while maintaining compact dimensions and simpler construction.
Solution Approach 2:
The patent employs a hydraulic piston pump where hydraulic fluid is conveyed from the pump chamber into the pressure chamber through the axial displacement of a piston. This hydraulic mechanism enables precise pressure control and low leakage while maintaining a compact form factor.
2Object-affected harmful factors
If conventional hydraulic pumps are used, then the door drive can be operated, but the operating noise is high
Solution Approach 1:
The patent replaces vibration pumps with a piston pump driven by a threaded connection, eliminating the vibration-induced noise while maintaining stable pressure generation through controlled piston displacement.
3Stress or pressure
If a hydraulic pump with high pressure capability is used, then the door drive can generate sufficient pumping pressure, but the installation space requirement increases
Solution Approach 1:
The patent uses a hydraulic piston pump where the piston's axial displacement in a compact cylinder generates high pressure. The threaded connection provides mechanical advantage to amplify the driving force, achieving high pumping pressure within a small volume.
Solution Approach 2:
The patent optimizes the pump chamber volume, piston cross-sectional area, and threaded connection parameters to generate high pressure with minimal displacement, thereby reducing the overall installation space while maintaining sufficient pumping pressure for door operation.
4Extent of automation
If complex automatic door drives are used, then the door can be opened and closed automatically, but the purchase, installation, operation, and maintenance costs increase
Solution Approach 1:
The patent extracts the essential hydraulic pumping function from complex automatic door drive systems, providing a simplified piston pump that can be integrated into various door drive configurations without requiring the complexity of fully automatic systems.
Solution Approach 2:
The patent designs a universal piston pump that can be integrated into different door drive applications, whether manual or automated, providing the necessary hydraulic function while maintaining simplicity and reducing overall system 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 achieves low leakage, compact, and cost-effective operation with high pumping pressures, reducing maintenance needs and noise, suitable for various door installations.
Implementation Method 1
a drive section of the drive shaft is coupled to the pump piston via a threaded connection in order to axially displace the pump piston in the fluid chamber
Implementation Method 2
a pump piston (50) which is sealed against a wall (18) of the fluid chamber (12), wherein the pump piston (50) delimits a pump chamber (14) in the fluid chamber (12)
Data Source
Figure 1
Figure 2
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AI summary
The invention relates to a door drive (200) for a door, comprising a housing (210) with a hydraulic cylinder (212), a drive mechanism (218) which can be coupled to the door and is arranged in the hydraulic cylinder (212) with a movable drive piston (220) and a closing spring (224) which acts on the drive piston (220) in the closing direction of the door, wherein a pressure chamber (214) for acting on the drive piston (220) with a hydraulic fluid (102) in the opening direction of the door is formed on the side of the drive piston (220) opposite the closing spring (224), a hydraulic system (90), and a hydraulic pump (10) for pumping the hydraulic fluid (102) into the pressure chamber (214).