Piston Cylinder Unit With Circumferential Nozzles
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Solution Overview
Problem
Piston cylinder units face instability issues due to lateral tilting caused by asymmetric fluid entry into the bearing gap, particularly at high pressures during compression, which compromises the load-bearing capability, especially at top dead center positions.
Innovation Solution
The implementation of a piston cylinder unit with fluid outlet nozzles arranged along the circumference of both the cylinder and piston inner circumferential walls, connected to a pressurized fluid supply, and optionally incorporating a circumferential ventilation groove to vent pressurized fluid to a lower pressure level, ensuring consistent support and pressure balancing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the piston is fluid pressure supported in a compression cavity with high pressure, then the compression force is improved, but the piston becomes laterally tilted due to asymmetric fluid entry into the bearing gap
Solution Approach 1:
The patent introduces a section of the bearing gap with greater radial extension adjacent to the compression cavity, creating a localized structural modification. This section acts as a pressure equalization zone that receives fluid from the compression cavity and distributes it symmetrically, preventing asymmetric pressure distribution and piston tilting while maintaining the overall compression function
2Manufacturing precision
If the bearing gap thickness is reduced to increase precision, then the load bearing capability is improved, but the tilt stability is reduced when pressure in the compression cavity exceeds bearing gap pressure
Solution Approach 1:
The patent creates a bearing gap section with greater radial extension that acts as a preliminary pressure equalization zone. This section is positioned to receive fluid from the compression cavity before it can cause asymmetric pressure distribution in the main bearing gap, thereby preventing piston tilting before it occurs
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
This configuration enhances the tilt stability of the piston, maintaining its centered position even at maximum compression, by providing constant radial support and minimizing transverse forces, thus maintaining the load-bearing capability of the fluid pressure bearing.
Implementation Method 1
Pressurized fluid, advantageously pressurized gas which is conducted through the connection channel 28 into the ring channels 30, 32, 34 can thus exit through the micro holes 30′, 32′34′ and can form a fluid cushion for example a gas cushion laterally supporting the piston in a bearing gap 19
Implementation Method 2
the ventilation groove is configured in a circumferential section of the piston that is adjacent to the piston face wall, and wherein the ventilation conduit reduces pressurized fluid entering the ventilation groove to a pressure level which is lower than a pressure in the compression cavity
Data Source
AI summary
A piston-cylinder unit including a piston that is fluid pressure supported and movable in a linear manner in a cylinder, wherein the cylinder, a face wall of the piston and a face wall of the cylinder define a compression cavity which is at a minimum size in a portion of a top dead center of the piston, wherein the compression cavity is connected in a fluid transferring manner with a bearing gap which is formed between a cylinder inner circumferential wall and a piston outer circumferential wall, wherein a plurality of fluid outlet nozzles are arranged in at least one cross-sectional plane of the cylinder in the cylinder inner circumferential wall along a circumference, which fluid outlet nozzles open into the bearing gap and are connected with a supply conduit for a pressurized fluid.