Load-Dependent Piston Throttle for Low-Noise Damping Control
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Solution Overview
Problem
Existing cylinder-piston units experience excessive damping at low stroke speeds, leading to inefficient energy transfer and potential noise issues during deceleration.
Innovation Solution
A cylinder-piston unit with a load-dependent damping mechanism, featuring a piston with a resiliently deformable disk that adjusts its position relative to a relief portion on the piston end face, allowing for multi-stage damping control by varying the closure of piston channels based on load and speed, ensuring optimal fluid flow and reduced deceleration noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a damper is designed with fixed damping characteristics, then the structure is simple and reliable, but excessive damping occurs at low stroke speeds causing noise and energy loss
Solution Approach 1:
The piston disk is made resiliently deformable rather than rigid, allowing it to dynamically change its position and sealing effect against the piston channels based on operating conditions. This dynamic behavior enables the damping characteristics to vary with load and speed, reducing noise at low speeds while maintaining effectiveness at high speeds.
Solution Approach 2:
The damping parameter is changed by varying the closure of piston channels through the deformable piston disk. Under different load and speed conditions, the piston disk deforms to different extents, changing the effective flow area and thus the damping parameter adaptively to prevent excessive damping at low speeds.
2Force
If the piston channels are closed to increase damping, then deceleration control is improved, but energy transfer efficiency decreases at low speeds
Solution Approach 1:
The piston disk dynamically adjusts the closure of piston channels based on operating conditions. At low speeds, the disk remains more open to maintain energy transfer efficiency, while at high speeds or under load, it closes more to provide effective deceleration control, thus adaptively balancing force control and energy efficiency.
Solution Approach 2:
The flow resistance parameter of piston channels is changed by the deformable piston disk responding to pressure and load conditions. This parameter change allows the system to optimize between deceleration control and energy transfer efficiency by adjusting channel closure dynamically rather than maintaining fixed closure.
3Adaptability or versatility
If a load-dependent damping mechanism is added, then damping performance across varying loads is optimized, but device complexity increases
Solution Approach 1:
A resiliently deformable piston disk (thin flexible element) is used to achieve load-dependent damping. This single flexible component replaces complex multi-stage valve mechanisms, providing adaptive damping through elastic deformation that responds automatically to load and pressure changes without additional control elements.
Solution Approach 2:
The piston disk automatically adjusts damping characteristics through its own elastic deformation in response to operating conditions, without requiring external control systems or additional actuating mechanisms. The structure serves itself by using the operating pressure and load to directly control the degree of piston channel closure.
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 load-dependent damping mechanism ensures efficient energy transfer and reduced noise across varying load conditions by adjusting damping levels dynamically, maintaining optimal performance during both high-speed and low-speed operations.
Implementation Method 1
The piston journal carries a resiliently deformable piston disk which is displaceable in the longitudinal direction and covers the throttle channel at least in some sections. Depending on the pressure building up in the displacement space, the piston channels are more or less closed
Implementation Method 2
During the return stroke in the direction of the compensation space, the piston disk is lifted from the piston end face, such that the damping medium can flow largely unhindered from the compensation space into the displacement space
Implementation Method 3
On the displacement space side, at least one throttle channel connects at least one first piston channel with the piston lateral surface
Data Source
AI summary
A cylinder-piston unit with load-dependent damping includes a piston longitudinally displaceable in a cylinder. The piston has a first piston channel and a second piston channel, which each connect a compensation space on one side of the piston to a displacement space side on an opposite side of the piston. On the displacement space side a throttle channel connects one first piston channel to the piston lateral surface. On its displacement space side the piston has a piston journal, which carries a resiliently deformable piston disc. The piston disc is displaceable and covers the throttle channel at least partially. The displacement space side has at least one relief portion deviating from a piston end face plane. The relief portion is delimited on a number of sides by a plurality of boundary lines running concentrically with respect to the central axis. Each of these boundary lines can be differentiated continuously.