Hydraulic Device Seal Ring Positioning via Intermediate Member
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Solution Overview
Problem
In human-powered vehicles, hydraulic devices face challenges in maintaining the appropriate position of pistons and seal rings, leading to inefficient movement and potential leakage due to the lack of effective mechanisms to manage the movement of seal rings within annular grooves.
Innovation Solution
The hydraulic device incorporates an intermediate member within the annular groove to maintain the seal ring's initial position, reducing its movement towards the inner surface of the groove, ensuring the piston returns to its rest position accurately and preventing leakage by providing a controlled clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the seal ring is provided in the annular groove without an intermediate member, then the device complexity is reduced, but the piston positioning accuracy deteriorates and seal ring movement increases
Solution Approach 1:
An intermediate member is introduced between the seal ring and the first inner surface of the annular groove. This intermediate member acts as a mediator that maintains the initial position of the seal ring, preventing excessive movement toward the inner surface while the piston returns to its rest position, thereby improving positioning accuracy without requiring complex adjustment mechanisms.
2Reliability
If the seal ring is allowed to move freely in the annular groove, then the ease of operation is improved, but fluid leakage increases
Solution Approach 1:
The intermediate member serves as a controlled intermediary that permits necessary movement of the seal ring for operation while simultaneously preventing excessive movement that would cause leakage. It maintains optimal clearance between the seal ring and the inner surface, ensuring reliability without restricting operational movement.
3Volume of moving object
If the intermediate member is positioned close to the first radially inner end of the seal ring, then the clearance space is optimized, but the seal ring movement control is reduced
Solution Approach 1:
The intermediate member is designed with specific radial and axial dimensions that create optimal local clearance zones. By carefully controlling the radial length and axial position of the intermediate member relative to the seal ring, the design achieves both sufficient clearance space for operation and precise position control through strategic placement in the annular groove.
Data Source
AI summary
A hydraulic device comprises a base member, a piston, a seal ring, and an intermediate member. The base member includes a cylinder bore and an annular groove. The annular groove includes a first inner surface and a second inner surface. The piston is movable relative to the base member from a rest position toward an actuated position in a second direction opposite to a first direction. The piston is movable relative to the base member from the actuated position toward the rest position in the first direction. The seal ring includes a first axial surface facing in the first direction and a second axial surface facing in the second direction. The seal ring is provided in the annular groove so as to define a clearance between the first axial surface and the first inner surface. The intermediate member is provided in the clearance.