One-Way Damper Valve Piston Segmentation
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Solution Overview
Problem
Existing motion dampers for furniture items, such as door wings, require complex and precise manufacturing processes, making them unsuitable for mass production and economical production due to high tolerance requirements and multi-stage piston rod designs, which are difficult to achieve with standard O-rings and additional control mechanisms.
Innovation Solution
A one-way hydraulic or pneumatic damper with a cylindrical housing, a piston rod, a piston with a valve part and a ring seal, and a compression spring, where the piston rod engages with a blind hole in the valve part, and a circumferential groove with a ring seal to control medium flow, allowing for reliable two-sided damping with only three components and no additional connecting parts, enabling standard and easily manufactured parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two-stage piston rod with threaded connections and multiple components is used to achieve reliable two-way damping, then the damping reliability is improved, but the manufacturing complexity and cost increase significantly
Solution Approach 1:
The piston rod is divided into two functional sections: a first section that engages with the piston and a second section that extends outward. This segmentation allows each section to be optimized independently - the first section can have threading for reliable connection while the second section remains simple for easy manufacturing and assembly, thereby reducing overall complexity while maintaining damping reliability.
Solution Approach 2:
The threading is extracted from the entire piston rod and concentrated only in the first section where it is actually needed for piston engagement. This extraction eliminates unnecessary threading from the second section, simplifying manufacturing and reducing cost while preserving the essential connection function for reliable damping operation.
2Reliability
If high precision manufacturing processes are used to achieve narrow tolerance fields for O-rings and valve components, then the operational reliability is improved, but the manufacturing cost and complexity increase
Solution Approach 1:
High precision manufacturing is applied locally only to the valve portion and its interaction surfaces with the piston rod, where precise control of medium flow is critical for damping function. Other components like the piston rod body and housing can be manufactured with standard tolerances, thereby reducing overall manufacturing complexity and cost while maintaining operational reliability where it matters most.
Solution Approach 2:
The valve portion is designed to move dynamically relative to the piston rod, creating a variable clearance that automatically adjusts the medium flow path. This dynamic mechanism provides reliable damping control through natural mechanical movement rather than requiring precisely fixed dimensions, thereby reducing tolerance field requirements while maintaining operational reliability.
3Reliability
If additional control mechanisms and connecting parts are added to achieve precise medium flow control, then the damping quality is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The valve portion is merged with the piston rod to form an integrated component, eliminating the need for separate connecting parts and additional control mechanisms. The valve portion itself provides precise medium flow control through its geometric design and movement characteristics, thereby achieving high damping quality while reducing device complexity and the number of components that would increase manufacturing cost.
4Reliability
If multi-stage piston rod designs with threaded ends and nuts are used, then the connection reliability is improved, but the ease of manufacture and suitability for automated assembly decrease
Solution Approach 1:
The piston rod is segmented into a first section with threading for reliable piston connection and a second section without threading for simplified manufacturing and automated assembly. This segmentation allows the complex threaded portion to be precisely manufactured and assembled first, while the simple second section can be easily formed and attached through automated processes, thereby maintaining connection reliability while improving ease of manufacture.
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
This design achieves high-quality, variable damping with reduced manufacturing complexity and cost, suitable for automated assembly and mass production, eliminating the need for precise mechanical processing and additional control mechanisms.
Implementation Method 1
a compression spring (9) that returns said piston rod (3) to initial position
Implementation Method 2
hydraulic or pneumatic damper
Implementation Method 3
hydraulic or pneumatic damper
Implementation Method 4
a viscous fluid. The piston is formed with a piston rod insertion through-hole which together with other holes in the end wall provides passage for a viscous fluid
Data Source
Figure 1
Figure 2
AI summary
A one-way hydraulic or pneumatic damper (1) of the invention comprising a cylindrical housing (2) closed at one end, in which a piston rod (3) is arranged in direction of the longitudinal axis, said piston rod (3) protruding through a cover (5) closing the second end of said housing and having on its other end that reaches into said housing a piston (4), and between the closed end of said housing (1) and said piston (4) there is a compression spring (9), wherein said piston (4) having an opening (12) running transversally to the longitudinal axis of said damper (1) is separated into a piston portion (13) and a valve portion (14), wherein said valve portion (14) of said piston (4) has a central hole (15), into which said piston rod (3) engages, the surface of the cross-section of said piston rod (3) being smaller than the surface of the cross- section of said hole (15) of said valve portion (14).