Hydraulic Actuator Assembly With Restricting Member Alignment
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Solution Overview
Problem
Aligning the direction of extension of the restricting member with the axial direction of the tube is difficult during assembly of a hydraulic actuator with a specific structure.
Innovation Solution
A hydraulic actuator design that includes a positioning member, such as projections or slots, to guide the restricting member along the axial direction, and a crimping mechanism to secure the tube, sleeve, and restricting member together, facilitating easy alignment and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a restricting member is provided inside the sleeve to resist compression and enable deformation in an intersecting direction, then the hydraulic actuator achieves the desired mechanical function, but aligning the direction of extension of the restricting member with the axial direction of the tube becomes difficult during assembly
Solution Approach 1:
A positioning member is introduced as an intermediary element between the restricting member and the sealing member. This positioning member includes positioning protrusions that engage with corresponding positioning grooves on the restricting member, automatically guiding and aligning the restricting member's extension direction with the axial direction of the tube during assembly, thereby eliminating the alignment difficulty while maintaining the mechanical function
2Ease of manufacture
If the positioning member is provided at the sealing member to guide the restricting member, then assembly alignment is improved, but the structure becomes more complex
Solution Approach 1:
The positioning member is merged with the sealing member as an integrated component. The positioning protrusions are formed directly on the sealing member body, combining the sealing function and the positioning function into a single element. This integration adds minimal structural complexity while effectively achieving the alignment guidance function during assembly
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 design allows for easy alignment of the restricting member with the axial direction, reducing assembly interference and torsion, and ensuring secure fixation of the components.
Implementation Method 1
a cylindrical tube that expands and contracts in accordance with pressure of a fluid
Implementation Method 2
a crimping member in a range of the insertion portion from the positioning member, the crimping member crimping the tube, the sleeve, and the restricting member to the sealing member from radially outward
Data Source
AI summary
A hydraulic actuator includes a cylindrical tube, a sleeve, a restricting member, first and second sealing members, and a positioning member. The tube expands and contracts with pressure of a fluid. The sleeve covers an outer circumferential surface of the tube, and is widened in radial directions by expansion of the tube while limiting elongation of the tube in an axial direction S. The restricting member is provided radially inward of the sleeve, from one side to the other side in the axial direction S, and resists compression along the axial direction but is deformable in an intersecting direction X intersecting the axial direction. The sealing members seal respective ends of the tube at the one side and other side in the axial direction S. The positioning member is provided at a circumferential direction portion of at least one of the sealing members. The positioning member positions the restricting member to follow the axial direction.