Progressive Damping Valve with Parallel Pressure Relief
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Solution Overview
Problem
The existing damping valve devices for vibration dampers face challenges in achieving the desired damping effect while maintaining manufacturing precision, as the spacing between the ring element and the flow guiding surface must be kept small to prevent blockage, which increases manufacturing complexity and risks failure if full contact occurs.
Innovation Solution
A pressure limiting valve is connected hydraulically in parallel with the restriction to eliminate the risk of blocking, allowing for a reduction in manufacturing complexity and enabling a more compact design, with features such as elastic valve disks and a deformable carrier disk to manage pressure and maintain a defined damping force characteristic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spacing between the ring element and the flow guiding surface is kept small to achieve desired damping effect, then the damping performance is improved, but the manufacturing precision requirement increases and the risk of blockage increases
Solution Approach 1:
A pressure limiting valve is introduced as an intermediary component connected hydraulically in parallel with the restriction. This valve prevents excessive pressure buildup that could cause blockage, allowing the restriction to operate with smaller spacing while maintaining reliability. The pressure limiting valve acts as a safety mechanism that mediates between the damping requirement (small spacing) and the blockage risk (large spacing tolerance).
Solution Approach 2:
The system changes the pressure parameter dynamically through the pressure limiting valve. When pressure exceeds a defined level, the valve opens to relieve pressure, preventing blockage. This allows the restriction to maintain small spacing for effective damping while the pressure parameter is controlled to prevent harmful effects.
2Reliability
If the ring element is manufactured with high precision to prevent full contact blocking, then the blockage risk is reduced, but the manufacturing outlay increases considerably
Solution Approach 1:
The pressure limiting valve serves as a protective intermediary that prevents the harmful condition (excessive pressure leading to blockage) from occurring. This allows the ring element to be manufactured with lower precision while the pressure limiting valve ensures blockage prevention, thereby reducing manufacturing costs.
Solution Approach 2:
The pressure limiting valve can be designed as a simpler, more cost-effective component that protects the more critical restriction. By using a less expensive pressure limiting mechanism, the overall system manufacturing cost is reduced while maintaining reliability.
3Reliability
If a pressure limiting valve is added to eliminate blocking risk, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The pressure limiting valve is integrated with the existing damping valve device structure. The valve body, ring element, and flow guiding surfaces are combined into a unified hydraulic system where the pressure limiting function is achieved through the interaction of existing components rather than adding completely separate mechanisms.
Solution Approach 2:
The ring element serves multiple functions: it acts as both the restricting element for damping and as part of the pressure limiting valve mechanism. The same structural components perform both restriction and pressure limitation functions, reducing overall device 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 reduces manufacturing outlay and prevents blockage, allowing for efficient operation and adjustable damping force characteristics, ensuring reliable vibration damping without the need for conventional tension or compression stops.
Implementation Method 1
the pressure limiting valve to have an outflow cross section covered by at least one elastic valve disk
Implementation Method 2
the carrier disk having a deformable volume region that determines the outflow cross section of the pressure limiting valve
Data Source
AI summary
A damping valve device for a vibration damper having a piston rod includes a first damping valve which, in a first operating range, moves into an operating position allowing throughflow as the flow velocity of a damping medium increases. A second operating range having a progressive damping force characteristic is influenced by a throttle point in conjunction with a valve body. The valve body is configured as a ring element which has a variable diameter and carries out a radial closing movement in the direction of a flow guiding surface at which a defined minimum throughflow cross-section is maintained, a pressure control valve being hydraulically parallel-connected to the throttle point.