Actuator Spring Return Piston Linkage Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing single-action actuators require multiple seals and extra axial length to accommodate compressed springs, leading to potential malfunctions and size constraints, especially in restricted spaces.
Innovation Solution
The actuator design places return springs on the same side as the linkage means, eliminating the need for extra axial space and reducing the number of seals required, with support means like rods or chambers to prevent lateral bending and ensure smooth motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the pinion is housed in the pressure chamber, then the actuator can be compact, but three seals are required which increases the risk of malfunction
Solution Approach 1:
The pinion is extracted from the pressure chamber and relocated to the outer chamber. This separation eliminates the need for pressure seals at the pinion ends, reducing the total seal count from three to one (only the piston seal remains). The pinion now operates in a non-pressurized environment while the pressure chamber remains sealed, resolving the contradiction between compact design and reliability.
2Reliability
If the outer chamber is sized to contain compressed springs, then the springs can function properly, but the actuator size increases which is problematic for restricted spaces
Solution Approach 1:
The springs are repositioned from the outer chamber to the inner chamber area, utilizing the radial/diameter space rather than requiring additional axial length. The inner chamber area, previously unused for spring accommodation, now houses the springs alongside the linkage means. This dimensional reorganization allows the actuator to maintain a compact axial profile while providing sufficient space for spring compression and expansion.
Solution Approach 2:
The functionally separate inner chamber area and outer chamber are merged into a single chamber that houses both the linkage means and the return springs. This consolidation eliminates the need for a separate outer chamber dedicated to spring accommodation, reducing the overall actuator volume while maintaining proper spring function through shared space utilization.
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 design results in a smaller, more reliable actuator with reduced seal failure risks and improved space efficiency, allowing for 90-degree rotation and adjustable spring force without lateral loading issues.
Implementation Method 1
The springs are compressed when the piston is forced in the first direction, and when the pressure in the pressure chamber is reduced the springs force the piston back in a second direction
Data Source
AI summary
An actuator comprising a cylinder and a spring return piston provided with linkage means, in which one or more return springs are situated on the same side of the piston as the linkage means.