Hydraulic Pilot Piston Sealing Ring for Low-Friction Sensitivity
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Solution Overview
Problem
Existing hydraulic control systems face challenges in managing high flow rates with sensitivity and low friction, particularly in small dimensions, and require efficient sealing mechanisms for precise control of hydraulic circuits and valves.
Innovation Solution
A steering assembly with a cylindrical body and axial bore, featuring a piston with a frustoconical surface and a sealing ring made of thermoplastic polymer or fluoropolymer, preloaded by a compression spring, which ensures low friction and high sensitivity control by adjusting the angle of the frustoconical surface and using a pilot fluid to manage the sealing ring's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If small-diameter pistons are used to achieve high sensitivity and low flow rate control, then sensitivity and flow rate control improve, but friction increases and reliability deteriorates
Solution Approach 1:
The patent replaces the traditional mechanical sealing system with a hydraulic sealing system. Instead of relying on mechanical contact between piston and bore surfaces, the invention uses hydraulic pressure to maintain sealing through the frustoconical surface geometry, which redirects hydraulic pressure into radial sealing force. This substitution eliminates direct mechanical friction while preserving the small piston diameter needed for sensitivity.
2Measurement precision
If small-diameter pistons are used to achieve high sensitivity, then sensitivity improves, but the piston must operate under low-friction conditions which increases device complexity
Solution Approach 1:
The patent employs a frustoconical surface on the piston instead of a traditional cylindrical surface. This curved geometry is specifically designed to redirect hydraulic pressure into radial sealing force. The conical angle (30°-65°) is optimized to convert axial hydraulic pressure into radial components that maintain sealing without requiring low-friction mechanical contacts, thus achieving sensitivity without increasing complexity.
3Reliability
If traditional sealing mechanisms are used in small hydraulic pushers, then sealing is achieved, but the device size increases and miniaturization is limited
Solution Approach 1:
The frustoconical surface serves multiple functions simultaneously: it provides sealing, redirects hydraulic pressure into radial sealing force, and eliminates the need for separate low-friction mechanical sealing components. This multi-functionality allows the sealing mechanism to be integrated directly into the piston structure, enabling miniaturization without compromising sealing reliability.
4Measurement precision
If high-pressure hydraulic circuits are controlled with high sensitivity, then control precision improves, but the system requires complex actuator elements with small-diameter pistons operating under low-friction conditions
Solution Approach 1:
The patent replaces complex mechanical actuator elements with a hydraulic actuation system. The frustoconical surface geometry converts hydraulic pressure directly into sealing and actuating forces, eliminating the need for small-diameter pistons operating under low-friction mechanical conditions. This substitution maintains high control precision while simplifying the actuator design.
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 solution enables precise control of hydraulic circuits and valves with low flow rates and high sensitivity, allowing for miniaturization and efficient sealing, even under low hydraulic pressures, while maintaining reliability and sensitivity.
Implementation Method 1
a compression spring (19) which is threaded onto the piston (11) and which is supported on one side by the rear face (17b) of the ring (17) and on the other side by the head (13) of the piston
Implementation Method 2
a frustoconical surface (15) open towards the rear part of this dwelling and inclined with respect to the longitudinal axis of the bore at an angle between 30° and 65°
Implementation Method 3
the depth of this housing being such that, when the piston head is in contact with the bottom of the housing, the spring is in a compressed state
Data Source
Figure 1~1a
Figure 2~3b
Figure 4
AI summary
The present invention relates to a piloting member (1) comprising a body (3) pierced with an axial bore (5) in which is mounted movably in translation a piston (11) whose anterior end (11a) is able to come out of the body (3). This piloting element is characterized in that: - the bore (5) opens into a housing (7) of larger diameter, which has at the level of the intersection of the latter with the bore (5) a frustoconical surface (15) open towards its rear part and inclined with respect to the longitudinal axis (xx') of the bore (5) at an angle (α) between 30° and 65°, - a sealing ring (17) having a frustoconical front face is threaded onto the piston (11) in such a way that this frustoconical face is in contact with the frustoconical surface (15) of the housing (7), - the piston (11) has at its rear end a head (13), - a compression spring (19) is disposed between this head (13) and the rear face of the sealing ring (17).