Nested Gas Pressure Spring for Temperature-Stable Force
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Solution Overview
Problem
Existing gas pressure springs with temperature compensation are complex in design, require a larger installation space, and often cannot effectively compensate for temperature dependence across the entire application-relevant temperature range.
Innovation Solution
A gas pressure spring design featuring a working piston movably guided in a working cylinder, a compensating cylinder radially enclosing the working cylinder, and a compensating piston separating working, compensation, and resetting chambers, with a single seal ensuring gas-tight operation and a compact, economical structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a compensating medium is used to compensate for temperature dependence, then the spring force becomes independent of temperature, but the device complexity increases
Solution Approach 1:
The patent combines the working cylinder and compensating cylinder into a single integrated structure where the compensating cylinder surrounds the working cylinder. The compensating piston serves dual functions by separating both the compensation chamber from the working chamber and defining the resetting chamber. This merging reduces the number of separate components and simplifies the overall device structure while maintaining temperature compensation functionality.
Solution Approach 2:
The compensating piston performs multiple functions: it separates the compensation chamber from the working chamber, defines the resetting chamber, and moves in response to compensating medium expansion to adjust the working chamber volume. The single seal arrangement also serves multiple sealing purposes. This multi-functionality reduces the number of components needed while achieving temperature compensation.
2Stability of the object's composition
If a compensating cylinder and compensating piston are added for temperature compensation, then the spring force becomes temperature-independent, but the installation space increases
Solution Approach 1:
The patent implements a nested configuration where the compensating cylinder radially surrounds the working cylinder, and the compensating piston is positioned within the compensating cylinder. The compensation chamber is formed in the annular space between the working cylinder and compensating cylinder. This nesting allows multiple functional chambers to coexist in a compact radial arrangement, minimizing the overall installation space while providing temperature compensation.
3Reliability
If multiple seals are used to ensure gas-tight separation of chambers, then reliability improves, but the device complexity and leak points increase
Solution Approach 1:
The patent uses a single seal that simultaneously seals the compensating piston from both the working cylinder and the compensating cylinder. This single seal is positioned on the compensating piston and creates gas-tight separation between the compensation chamber and working chamber while also defining the resetting chamber. This merging of sealing functions into a single component reduces the number of seal elements needed, decreases potential leak points, and simplifies the device structure while maintaining reliable gas-tight separation.
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 design achieves a spring force independent of temperature over a wide range, simplifies production, reduces installation space requirements, and ensures reliable operation with fewer leak points.
Implementation Method 1
The annular space formed between the working cylinder and a compensating cylinder is filled with a compensating medium that expands when the temperature increases
Data Source
AI summary
The invention relates to a gas pressure spring (50) comprising a working piston (2) which is guided displaceably in a working cylinder (1) along a stroke axis (H), a compensating cylinder (12) which encloses the working cylinder (1), and a compensating piston (10) which is of hollow-cylindrical shape and is guided displaceably in the compensating cylinder (12) along the stroke axis (H). The working cylinder (1) has an open end (1b), at which the compensating cylinder (12) forms a projection (15) beyond the working cylinder (1) with a closed end (15b). The compensating piston (10) separates a working chamber (1a) which is arranged in the working cylinder (1), a compensation chamber (12a) which is arranged between the working cylinder (1) and the compensating cylinder (12), and a restoring chamber (15a) arranged in the projection (15) from one another and is open at an upper side (10a) of the balancing piston (10) facing the working chamber (1a). The gas spring (50) comprises a seal (8) arranged on the upper side (10a) of the balance piston (10) which seals the balance piston (10) to the working cylinder (1) and to the balance cylinder (12).