Variable-Damping Hydraulic Cylinder for Stable Bending and Stretching
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Solution Overview
Problem
Current hydraulic cylinders with constant-value dampers in robots and human knee joints fail to match damping effectively under different bending and stretching states, leading to rigid postures and instability during movement.
Innovation Solution
A hydraulic cylinder with a linear variation in tensile and compression damping, comprising a reservoir drum, working cylinder, piston assembly, and damping-adjusting valve assembly, which adjusts oil flow damping to match force situations, ensuring elastic touch and hovering at any position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional constant-value damper is used, then the structure is simple, but the damping cannot be adjusted to match different working conditions, resulting in rigid posture and instability
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a static constant-value damper to a dynamic adjustable damping system. The damping-adjusting valve assembly allows real-time modification of damping characteristics based on working conditions, enabling the system to adapt its damping properties dynamically rather than remaining fixed.
Solution Approach 2:
The patent implements parameter changes by modifying the damping coefficient through the damping-adjusting valve assembly. The valve can adjust the opening area to change oil flow resistance, thereby varying the damping parameter from constant to variable, allowing optimization for different operational states such as bending and stretching.
2Reliability
If a constant-value damper is used, then the device complexity is low, but the damping effect is insufficient under varying force conditions, causing rigid postures
Solution Approach 1:
The system transitions from static to dynamic damping control, where the valve assembly can adjust damping characteristics in real-time based on movement state, improving reliability across varying conditions rather than relying on a fixed damping value that cannot adapt.
Solution Approach 2:
The damping coefficient is changed from a fixed parameter to a variable parameter through the valve assembly, allowing optimization of movement stability under different force conditions by adjusting the damping parameter to match actual working requirements.
3Adaptability or versatility
If a traditional damper without linear variable function is used, then the manufacturing is simple, but it cannot achieve effective damping match under different bending and stretching states
Solution Approach 1:
The patent changes the damping parameter from constant to variable through the damping-adjusting valve assembly, enabling effective damping matching under different bending and stretching states. The valve mechanism allows adjustment of the damping coefficient to optimize performance across various operational conditions.
Solution Approach 2:
The system transitions from a static damping system to a dynamic one where the damping characteristics can be adjusted in real-time based on the operational state, allowing the damper to adapt to different bending and stretching conditions rather than maintaining a fixed damping value.
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 hydraulic cylinder provides adaptive damping characteristics, ensuring smooth and stable movement by adjusting damping according to force conditions, preventing rigid postures and falls.
Implementation Method 1
an energy storage is arranged in the reservoir drum, and an energy-storage chamber is formed between with the energy storage and the working cylinder
Implementation Method 2
A first end of the energy storage is connected with a rod chamber through a first pipeline, and the first end of the energy storage is connected with a non rod chamber through a second pipeline
Data Source
AI summary
A hydraulic cylinder with a linear variation in tensile and compression damping, which comprises a reservoir drum, a working cylinder fixedly arranged inside the reservoir drum, a piston assembly slidably connected with the reservoir drum, and a damping-adjusting valve assembly. An energy storage is arranged in the reservoir drum, and an energy-storage chamber is formed between the energy storage and the working cylinder, a working cylinder flow passage and an energy-storage flow passage are formed on an inwall of the reservoir drum, and both are connected with the damping-adjusting valve assembly. By adjusting oil flow damping in the hydraulic cylinder using the damping-adjusting valve assembly, the hydraulic cylinder can provide damping characteristics matching with force situations according to the force situations, and ensure the elastic touch and hovering at any position during use.