Hydraulic Shock Absorber Damping Element for Pressure Pulsation
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Solution Overview
Problem
Hydraulic systems for vehicle shock absorbers experience significant impairment in damping properties due to pressure pulsations caused by the hydraulic pump, especially when the pulsation frequency aligns with the system's resonance frequency.
Innovation Solution
Incorporation of elastically deformable damping elements, preferably made of foam material, directly interacting with the hydraulic fluid to compensate for pressure pulsations within the hydraulic system, including on the piston, pressure chambers, and hydraulic pump, ensuring reliable operation and adjustable shock absorber performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hydraulic pump is used to convey hydraulic fluid in the system, then the shock absorber can be adjusted hydraulically, but pressure pulsations are generated that impair damping properties
Solution Approach 1:
A damping element is introduced as an intermediary component between the hydraulic pump and the shock absorber pressure chamber. This damping element absorbs pressure pulsations from the hydraulic fluid, preventing them from being transmitted to the shock absorber piston while still allowing the hydraulic adjustment function to operate effectively.
Solution Approach 2:
The damping characteristics of the hydraulic system are modified by adding the damping element, which changes the pressure-fluctuation behavior of the hydraulic fluid. This parameter change allows the system to maintain both adjustability and reliable damping performance by reducing the amplitude of pressure pulsations.
2Productivity
If pressure pulsations occur at resonance frequency, then the damping properties are significantly impaired, but the hydraulic pump operation continues
Solution Approach 1:
The damping element converts the harmful pressure pulsations at resonance frequency into beneficial damping effects. By absorbing these pulsations, the damping element transforms what would be detrimental vibrations into a stabilizing force that actually enhances system reliability while maintaining pump operation.
3Reliability
If damping elements are added to compensate pressure pulsations, then damping properties are maintained, but system complexity increases
Solution Approach 1:
The damping element utilizes porous material structure to absorb pressure pulsations. This porous design allows the element to effectively dampen pressure fluctuations while maintaining a relatively simple and compact form factor, minimizing the increase in 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 effectively minimizes the transfer of pressure pulsations to the piston, allowing for reliable and variable adjustment of the shock absorber, maintaining optimal damping properties and operational stability.
Implementation Method 1
The damping element, in particular a compressibility of the damping element, is configured such that the damping element can be elastically deformed by pressure pulsations transferred via the hydraulic fluid, whereby the pressure pulsations are at least partially compensated.
Data Source
AI summary
A hydraulic system for a hydraulically adjustable vehicle shock absorber including a piston and at least one pressure chamber cooperating hydraulically with the piston, a hydraulic pump configured so as to convey the hydraulic fluid (F), and a hydraulic conduit assembly, via which the at least one pressure chamber of the hydraulically adjustable vehicle shock absorber is connected to the hydraulic pump. At least one elastically deformable damping element is in contact with the hydraulic fluid (F).