Compact Rotary Hydraulic Valve for Robot Pivot Joints
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Solution Overview
Problem
Conventional hydraulic valves for robotic systems are often bulky and unsuitable for compact, restricted spaces within robots, such as pivot joints, due to external couplings and large dimensions, which can lead to operational hazards and reduced precision.
Innovation Solution
A compact rotary hydraulic valve design featuring a cylindrical spool with eccentric channels and O-ring seals, allowing fluid flow to be controlled through rotational alignment, reducing torque requirements and accommodating multiple channels for simultaneous actuation, suitable for miniaturized hydraulic systems within robotic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hydraulic valves are used in robotic systems, then reliable hydraulic control is achieved, but the valve size becomes bulky and unsuitable for compact robotic components
Solution Approach 1:
The valve is integrated directly into the pivot joint structure, with the spool assembly nested within the pivot joint housing. The eccentric channel spool is contained within the pivot joint, eliminating the need for separate external valve bodies and couplings, thereby achieving compact integration while maintaining hydraulic control functionality
Solution Approach 2:
The valve functionality is merged with the pivot joint structure. The pivot joint housing serves dual purposes as both a mechanical joint and a valve body. The eccentric channel spool combines flow control and directional control functions within a single rotating component, reducing the number of separate parts and overall valve volume
2Reliability
If conventional hydraulic valves with external couplings are used, then hydraulic control is achieved, but operational hazards and reduced precision occur in restricted spaces
Solution Approach 1:
External couplings and separate valve bodies are eliminated by integrating the valve directly into the pivot joint. The hydraulic connections are internalized within the pivot joint structure, removing external coupling points that could create operational hazards in restricted robotic spaces
Solution Approach 2:
The valve components are nested within the pivot joint housing, with the spool assembly contained inside the joint structure. This nesting eliminates external protrusions and couplings that could interfere with robotic operation in restricted spaces, while maintaining full hydraulic control capability
3Volume of moving object
If a compact valve design is used to reduce size, then space requirements are reduced, but manufacturing precision and seal effectiveness become more challenging
Solution Approach 1:
The seal assembly uses composite construction with an elastomeric sealing element positioned between metal components (spool and housing). This combination of materials provides both the flexibility needed for effective sealing in compact spaces and the structural integrity to maintain seal effectiveness despite manufacturing tolerances
Solution Approach 2:
The seal assembly is positioned at a specific location where the spool meets the housing, creating a localized sealing zone. The elastomeric material is placed precisely at the interface between moving and stationary components, providing enhanced sealing capability at the critical location while allowing other parts of the compact valve to maintain reduced dimensions
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 compact valve design enhances power density, precision, and durability by reducing wear and maintaining effective seals, allowing for efficient hydraulic control in restricted spaces while minimizing external couplings, thus improving robotic performance and safety.
Implementation Method 1
an elastomeric seal positioned between a spool and a housing, the elastomeric seal to prevent fluid leakage between the spool and the housing
Implementation Method 2
A rotary hydraulic valve design featuring a cylindrical spool with eccentric channels and O-ring seals, allowing fluid flow to be controlled through rotational alignment
Data Source
AI summary
In an implementation, a hydraulic valve includes a valve body, a cylindrical chamber within the valve body, and a cylindrical spool within the chamber. The spool is rotatable between at least a first position and a second position about a longitudinal axis parallel to a longitudinal axis of the chamber. The spool includes a landing and an eccentric channel that extends around a portion of an outer circumferential surface of the landing. In the first position, an inlet and an outlet of the hydraulic valve are fluidly coupled by the eccentric channel to allow a flow of a hydraulic fluid circumferentially around the landing from the inlet to the outlet. In the second position, the inlet and/or the outlet are obstructed by another portion of the outer circumferential surface of the landing to prevent the flow of the hydraulic fluid from the inlet to the outlet.