External Bypass Damper With Elastic Wall for Foam-Free Damping
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Solution Overview
Problem
Existing hydraulic dampers require complex constructions and orientation-specific usage due to the need for compressible gas to prevent foaming and require bypasses that complicate production and high-speed blocking.
Innovation Solution
A damper design with a bypass outside the pressure tube, using an elastically deformable bypass wall to accommodate fluid volume changes, allowing complete fluid filling without gas accumulation, and featuring a bypass wall that forms an outer wall and integrates spacing means for volume compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bypass is arranged inside the pressure tube to conduct damping fluid from front chamber to rear chamber, then the damping fluid can flow between chambers, but the construction becomes complex and high-speed blocking becomes difficult
Solution Approach 1:
The bypass is extracted from the interior of the pressure tube and arranged in the annular space between the pressure tube and the outer housing. This extraction simplifies the internal construction of the pressure tube while maintaining the bypass functionality for damping fluid flow between front and rear chambers.
Solution Approach 2:
The bypass is relocated from the one-dimensional internal path within the pressure tube to the two-dimensional annular space surrounding the pressure tube. This dimensional change allows the bypass to be formed by the annular space itself, eliminating the need for complex internal bypass structures.
2Reliability
If compressible gas is added to the pressure tube or annular space to prevent foaming, then foaming is reduced, but the damper must be kept in specific alignment and cannot tolerate excessive movement or vibration
Solution Approach 1:
The invention converts the potentially harmful effect of damping fluid displacement during high-speed piston movement into a beneficial effect by designing the annular bypass with sufficient volume capacity. The bypass can accommodate the displaced fluid volume without causing excessive pressure buildup or foaming, eliminating the need for compressible gas and enabling orientation-independent operation.
Solution Approach 2:
The invention changes the volume parameter of the bypass by utilizing the annular space between the pressure tube and outer housing. This increased volume capacity allows the bypass to absorb fluid displacement during high-speed movement without causing foaming, thereby enabling the damper to operate independently of orientation and tolerate excessive movement or vibration.
3Device complexity
If the piston rod is led out through the rear chamber, then the damper structure is simplified, but the bypass must still accommodate high piston rod insertion speeds without causing foaming
Solution Approach 1:
The invention applies dynamics by designing the bypass with flexible flow characteristics that can adapt to varying piston rod insertion speeds. The annular bypass configuration allows damping fluid to flow dynamically between chambers, accommodating high-speed insertion without causing foaming while maintaining the simplified piston rod arrangement led through the rear chamber.
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 damper is versatile, independent of orientation and movement speed, with simplified construction and efficient damping across a wide range, suitable for applications like speed bumps without gas accumulation issues.
Implementation Method 1
The bypass is delimited at least in portions by a bypass wall, wherein the bypass wall is elastically deformable into the bypass to accommodate a volume of the damping fluid displaced by the piston rod when the piston rod is inserted into the pressure tube
Data Source
AI summary
The invention relates to a damper (100) comprising a pressure tube (110) filled with a damping fluid; a piston (120) displaceably mounted in the pressure tube (110) along a stroke axis (H), wherein the piston (120) divides the pressure tube (110) into a front chamber (111) along the stroke axis (H) in front of the piston (120) and a rear chamber (112) along the stroke axis (H) behind the piston (120); a piston rod (130) fastened to the piston (120), wherein the piston rod (130) is led out of the pressure tube (110) through the rear chamber (112) along the stroke axis (H); and a bypass (140) arranged outside the pressure tube (110), wherein the bypass (140) connects the front chamber (111) to the rear chamber (112) in a manner that conducts the damping fluid. The bypass (140) is delimited at least in portions by a bypass wall (141), wherein the bypass wall (141) is elastically deformable into the bypass (140) to accommodate a volume of the damping fluid displaced by the piston rod (130) when the piston rod (130) is inserted into the pressure tube (110).