Fluid-Actuated Shaft Braking in Static Pressure Bearings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In rotation devices using static pressure bearings, there is no effective mechanism to reduce the rotation speed of the shaft, as the shaft remains in a floating state due to the fluid film, limiting the ability to adjust the rotation speed by altering the compressed gas flow.
Innovation Solution
A rotation speed reduction mechanism is introduced, comprising a fluid passage for pressurized fluid flow and an elastic member fixed to the housing, which is elastically deformed by the pressurized fluid to contact the shaft, allowing for adjustable braking of the shaft's rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a static pressure bearing is used to support the shaft, then the shaft can be rotatably supported with reduced friction, but the shaft enters a floating state due to the fluid film, making it impossible to effectively reduce rotation speed
Solution Approach 1:
The patent introduces an elastic member as an intermediary element between the pressurized fluid and the shaft. The elastic member receives the pressurized fluid and transmits the force to contact the shaft, enabling speed control without directly compromising the fluid film support mechanism. This mediator allows the system to maintain both the floating support benefit and the speed control capability.
Solution Approach 2:
The patent changes the physical state and pressure parameters of the fluid to achieve different functions. By controlling the pressure of the pressurized fluid, the system can adjust the degree of elastic deformation of the elastic member, thereby controlling the contact force with the shaft and achieving variable speed reduction while maintaining reliable shaft support.
2Force
If the amount of compressed gas is increased to try to reduce shaft rotation speed, then more braking force may be achieved, but the shaft's floating state is disrupted and stable support is lost
Solution Approach 1:
The elastic member serves as a buffer and intermediary that decouples the direct relationship between compressed gas amount and shaft contact force. It allows the system to apply braking force through controlled elastic deformation without directly disrupting the fluid film that maintains the shaft's stable floating state, thus resolving the contradiction between achieving braking force and maintaining stability.
Solution Approach 2:
The elastic member provides beforehand cushioning by being pre-positioned and pre-loaded with the pressurized fluid. This allows the system to gradually apply braking force through elastic deformation before any potential disruption to the shaft's floating state occurs, enabling smooth and controlled speed reduction while maintaining stability.
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 mechanism enables the effective reduction of the shaft's rotation speed by adjusting the degree of pressurization, ensuring the rotation speed can be appropriately controlled even with static pressure bearings.
Implementation Method 1
the elastic member is elastically deformed by the pressurized fluid flowing out from the fluid passage, to come into contact with the shaft
Implementation Method 2
The static pressure bearing rotatably supports a shaft by using a static pressure generated in a fluid film
Implementation Method 3
rotation of the shaft can be braked by contact of the elastic member with the shaft
Data Source
AI summary
A rotation speed reduction mechanism according to one embodiment comprises: a fluid passage which allows a pressurized fluid to pass therethrough and is provided such that the pressurized fluid flows toward a shaft; and an elastic member which elastically deforms and comes into contact with the shaft due to the pressurized fluid flowing out from the fluid passage, said elastic member having the base side thereof affixed to a housing, and having a section which extends in an orthogonal direction orthogonal to the direction in which the shaft extends.