Rotary Actuator Housing With Continuous Sealing Surface
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Solution Overview
Problem
Rotary actuators face issues with pressure leakage due to incomplete sealing between the vane and chamber, leading to reduced torque and loss of control in applications requiring high pressure differentials.
Innovation Solution
A unitary housing with a continuous internal sealing surface minimizes pressure bleeding by ensuring a robust dynamic seal between the rotary piston and the sealing surface, enhancing the ability to maintain a pressure differential and output torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a non-unitary housing with multiple parts is used, then ease of manufacture is improved, but sealing quality deteriorates due to joint lines and discontinuities
Solution Approach 1:
The housing is designed as a unitary component formed from a single piece of material, merging what would traditionally be multiple separate parts into one integrated structure. This eliminates joint lines and discontinuities in the sealing surface, thereby preventing pressure leakage while maintaining manufacturability through processes like casting or molding.
2Reliability
If a unitary housing is used, then sealing quality is improved by eliminating discontinuities, but device complexity increases
Solution Approach 1:
By integrating the housing into a single unitary component, the design reduces the number of separate parts and assembly steps. Although the manufacturing process for a unitary housing may be more complex, the overall device complexity is reduced by eliminating the need for multiple housing parts, fasteners, and assembly operations.
3Reliability
If sealing engagement between vane and chamber is improved, then pressure differential holding ability is improved, but friction increases
Solution Approach 1:
The sealing surface of the unitary housing is designed with specific local characteristics including smooth finishes and optimized geometry in the regions where the vane makes contact. This localized quality enhancement improves sealing effectiveness at the critical interface while minimizing friction across the entire sealing surface through proper surface preparation and material selection.
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 continuous sealing surface in the unitary housing improves the sealing quality, reducing pressure leakage and maintaining the required pressure differential, thus enhancing the actuator's torque output and control efficiency.
Implementation Method 1
the rotary piston is arranged to rotate about a rotation axis in accordance with a pressure differential applied between the first and second chambers
Implementation Method 2
the rotary piston is in sealing engagement with the sealing surface of the cavity such that the rotary piston divides the cavity into isolated first and second chambers
Data Source
AI summary
A rotary actuator comprises a unitary housing having a cavity therein and defining a continuous internal sealing surface. A rotary piston is located within the cavity in sealing engagement with the sealing surface of the cavity such that the rotary piston divides the cavity into isolated first and second chambers, wherein the rotary piston is arranged to rotate about a rotation axis in accordance with a pressure differential applied between the first and second chambers.