Segmented Piston Damper for Sliding Door Damping
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Solution Overview
Problem
Existing dampers for sliding doors and furniture are complex, leading to increased manufacturing and assembly costs, reduced reliability, and potential oil leakage, which can compromise functionality and prevent complete opening/closing due to geometric complexity and material wear.
Innovation Solution
A damper design featuring a piston composed of two mobile bodies with a simple geometric configuration, where the first body is integral with the stem and the second body slides within the cylinder, creating a small interspace for damping and specific passage ports for quick reset, minimizing contact with the cylinder inner surface and reducing oscillations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex piston structure with multiple mobile elements is used to achieve damping and quick reset, then the damping performance is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The piston is divided into two separate mobile bodies (first mobile body and second mobile body) that can move independently relative to each other within the cylinder. This segmentation allows each body to perform specific functions: the first body creates the interspace for damping while the second body provides passage ports for quick reset, achieving complex damping characteristics through simple individual components rather than a single complex piston structure
Solution Approach 2:
The first mobile body is nested within the second mobile body, with both bodies sliding within the cylinder. This nested configuration allows the smaller first body to create the damping interspace between itself and the cylinder wall, while the second body provides the outer structure with passage ports, achieving multiple functions through a compact nested arrangement that reduces overall complexity
2Reliability
If the piston structure involves multiple mobile elements and complex geometry, then damping control is improved, but manufacturing and assembly costs increase
Solution Approach 1:
By segmenting the piston into two simple mobile bodies with basic geometric shapes (cylindrical or disc-like structures), the manufacturing process is simplified compared to creating a single complex piston with integrated damping chambers and valve mechanisms. Each body can be manufactured separately using standard machining processes and then assembled, reducing both manufacturing and assembly costs while maintaining effective damping control
Solution Approach 2:
The damping characteristics are controlled by changing the parameters of the interspace (width, position) and passage ports (size, location) rather than complex internal piston geometry. This allows for simpler piston bodies that can be manufactured more easily, with damping performance tuned by adjusting dimensional parameters during the design phase rather than requiring complex internal structures
3Stability of the object's composition
If the piston has extensive contact with the cylinder inner surface, then guiding and stability are improved, but oil leakage and seizure risk increase
Solution Approach 1:
The piston is segmented into two mobile bodies with limited contact surfaces with the cylinder wall. The first mobile body has a small contact area that creates the damping interspace, while the second mobile body provides structural support with minimal contact. This segmentation reduces the total contact area between the piston assembly and cylinder inner surface, minimizing oil leakage paths and reducing seizure risk while maintaining stability through the distributed contact points
Solution Approach 2:
The oil film within the interspace acts as an intermediary between the first mobile body and the cylinder wall, providing hydrodynamic lubrication that reduces direct contact and friction. This intermediary oil layer prevents seizure by maintaining a protective film between moving surfaces, while the controlled interspace geometry ensures adequate oil pressure is maintained to prevent leakage past the piston
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 optimized damping with reduced production costs, minimizes oil leakage, ensures complete opening/closing, and enhances the working life by avoiding piston seizure and misalignment issues, while maintaining accurate linear motion.
Implementation Method 1
the friction generated inside the cylinder during the piston movement, which is particularly connected to the backflow of the oil contained in the inner chamber of the piston
Implementation Method 2
the oil begins to seep through a small interspace formed between the piston outer surface and the cylinder inner surface
Implementation Method 3
a head portion peripherally provided with four chamfers suitable for creating preferential paths for the oil
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A damper is provided, comprising a piston (4) which is borne by a stem (5) and slides in a cylinder (2) thereby delimiting two chambers (A, B). The piston (4) consists a first mobile body (6), fixed to the stem (5), and a second body (7), which is mobile with respect to the first body (6) in order to define first and second operating conditions of the piston (4). An interspace (1) is defined between an outer side surface (11) of the second mobile body (7) and an inner surface (12) of the sleeve (2) such that in the first operating condition the piston (4) occludes a passage port between the two chambers (A, B) and the fluid is able to backflow from a chamber to the other through the interspace (1), whereas in the second operating condition, the passage port between the two chambers (A, B) is open and the fluid is able to flow through the second mobile body (7) and through the interspace (I)..