Hydraulic Actuation Oil-Path Switching With Rotating Handle
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Solution Overview
Problem
Conventional hydraulic actuation devices have a large handle that extends perpendicularly to the spool valve, increasing the device's size, mass, and cost due to the complex mechanism for switching oil paths.
Innovation Solution
A hydraulic actuation device with a switchover portion that includes an actuation part, a first shaft part, and a second shaft part, which alternately advance/recede when rotated, simplifying the mechanism for switching oil paths through a conversion member and phase adjustment member, and utilizing seal members and oil passages to control the flow direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional spool valve with a handle extending perpendicular to the piston rod is used to switch oil paths, then the oil path switching function is achieved, but the device size, mass, and cost increase due to the complex mechanism
Solution Approach 1:
The spool valve is divided into a first spool valve and a second spool valve that operate independently but cooperatively. Each spool valve controls a specific oil path segment, allowing complex oil path switching to be achieved through simpler, modular components rather than a single complex valve mechanism.
Solution Approach 2:
The handle is repositioned from extending perpendicular to the piston rod to extending in the same direction as the piston rod. This dimensional change in handle orientation allows the operator to switch both spool valves simultaneously through a single rotational motion, simplifying the operating mechanism while maintaining full oil path control capability.
2Ease of operation
If a handle extending perpendicular to the spool valve is used for operation, then the spool valve can be actuated, but the placement space for the handle is large and the device size is increased
Solution Approach 1:
The handle is repositioned from extending perpendicular to the piston rod to extending in the same direction as the piston rod. This dimensional change in handle orientation allows the operator to switch both spool valves simultaneously through a single rotational motion, simplifying the operating mechanism while maintaining full oil path control capability.
Solution Approach 2:
The functions of two separate handle operations are merged into a single handle rotation. By positioning the handle in the same direction as the piston rod and connecting it to both spool valves, a single rotational motion simultaneously actuates both valves, eliminating the need for separate control mechanisms and reducing overall device volume.
3Ease of operation
If multiple cam mechanisms are provided between the spool valve and the grip handle, then the rotational motion can be converted to advancing/receding motion, but the mechanism becomes complicated and the device size increases
Solution Approach 1:
The spool valve is divided into a first spool valve and a second spool valve that operate independently but cooperatively. Each spool valve controls a specific oil path segment, allowing complex oil path switching to be achieved through simpler, modular components rather than a single complex valve mechanism.
Solution Approach 2:
The handle is repositioned from extending perpendicular to the piston rod to extending in the same direction as the piston rod. This dimensional change in handle orientation allows the operator to switch both spool valves simultaneously through a single rotational motion, simplifying the operating mechanism while maintaining full oil path control capability.
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 device achieves a simpler structure with reduced size and cost by allowing easy switching of oil paths through a rotational motion, enhancing portability and operational efficiency.
Implementation Method 1
a conversion member configured to convert a rotational motion of the actuation part to advancing/receding motions of the first shaft part and the second shaft part
Implementation Method 2
The switchover portion may include seal members extending along the circumferential direction of the first shaft part and the second shaft part
Data Source
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AI summary
This hydraulic actuation device (e.g., cutting device 10) includes: a hydraulic pump configured to generate pressure oil; a tool (specifically, a cutting portion 50) configured to be actuated by the pressure oil generated by the hydraulic pump; an oil passage through which the pressure oil generated by the hydraulic pump is sent to the tool and return oil is returned from the tool to the hydraulic pump; and a switchover portion (specifically, an operation handle 70, a handle support portion 72, and a phase adjustment member 76) provided to the oil passage and configured to switch a path for at least one of the pressure oil and the return oil. The switchover portion includes an actuation part (specifically, the handle support portion 72), and a first shaft part (specifically, a first pushing portion 78a) and a second shaft part (specifically, a second pushing portion 78b) configured to advance/recede when the actuation part is rotated. When the actuation part is rotated, the first shaft part and the second shaft part alternately advance/recede in a direction perpendicular to a direction in which the actuation part is rotated, whereby the path in the oil passage is switched.