Hybrid Linear Guide with Hydrostatic Pockets and Island Surfaces
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Solution Overview
Problem
Existing hydrostatic linear guides are susceptible to interfering influences such as ground vibrations, making it difficult to maintain precise positioning of the carriage during machining, and they have limited path accuracy, especially in longer guides.
Innovation Solution
A device with a displaceable carriage featuring pockets for lubricant under pressure and an island-shaped surface to create adjustable friction, combining hydrodynamic and hydrostatic slideways for improved precision and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydrostatic linear guide with pockets holding lubricant under pressure is used, then the carriage can be supported with reduced friction, but the guide becomes susceptible to interfering influences such as ground vibrations, making it difficult to maintain precise positioning
Solution Approach 1:
The patent combines hydrostatic guidance (pockets holding lubricant under pressure) with hydrodynamic guidance (island-shaped surfaces producing frictional force) into a hybrid linear guide system. This merging allows the system to benefit from both low friction support and vibration damping, resolving the contradiction between reduced friction and susceptibility to interfering influences
Solution Approach 2:
The guide system uses a composite approach by integrating two different lubrication mechanisms (hydrostatic and hydrodynamic) into a single guide structure. The combination of pocket-based hydrostatic support and island-shaped hydrodynamic surfaces creates a composite guidance system that achieves both precision and vibration resistance
2Manufacturing precision
If a hydrostatic linear guide is used, then friction is reduced, but the achievable path accuracy is restricted in the case of long guides
Solution Approach 1:
The hybrid guide system merges hydrostatic and hydrodynamic principles to maintain high path accuracy over long guide lengths. The hydrodynamic component provides stability and vibration damping that becomes increasingly important as guide length increases, while the hydrostatic component maintains low friction throughout the entire guide length
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 enables precise movement and positioning of the carriage with reduced frictional forces, effectively damping out interfering factors and enhancing path precision and stiffness, particularly in longer guides.
Implementation Method 1
at least one pocket, in which lubricant can be held under pressure
Implementation Method 2
an island-shaped surface to produce a frictional force acting on the carriage
Data Source
AI summary
A displaceable carriage (10) and a linear guide for guiding the carriage, which includes a first guide path slideway (13, 31) and a second guide path slideway (32). To form the first slideway (13, 31), the carriage (10) includes at least one pocket (13), which slides along the first guide path part (31) and can hold lubricant under pressure to create a relieving force on the carriage (10). The second guide path part (32) includes an island-shaped surface to create a frictional force on the carriage (10). A pressure medium held in the at least one pocket (13, 14, 15) creates the relieving force, whereby the first slideway (13, 31) relieves the load on the second slideway (11a, 12a, 12b, 32).