Hydraulic Composite Bushing Flow Channel Sealing Under Pressure
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Solution Overview
Problem
Current hydraulic bushings suffer from inadequate sealing of the flow channel, leading to lateral leakage of hydraulic fluid, which affects the stiffness adjustment and service life due to high fluid pressure and volume changes under load and vibration.
Innovation Solution
A hydraulic composite bushing with a core shaft, rubber member, and support rings, featuring a flow channel sealed by a first and second sealing element, and a sealing gasket, which are integrated through vulcanization, ensuring effective communication and sealing between hydraulic chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the flow channel is sealed through direct pressing by the rubber member or outer casing, then the structure is simple, but the sealing performance is insufficient under high fluid pressure and volume changes
Solution Approach 1:
A sealing ring is introduced as an intermediary component between the flow channel and the rubber member/outer casing. This sealing ring specifically seals the contact gap where hydraulic fluid tends to leak, while the rubber member and outer casing provide overall structural support. The sealing ring acts as a dedicated mediator for sealing functionality, resolving the contradiction between simple structure and reliable sealing.
2Ease of manufacture
If the flow channel is arranged on the surface of the core shaft or support ring, then the manufacturing is simple, but lateral leakage occurs under load and vibration
Solution Approach 1:
The sealing ring serves as an intermediary that bridges the flow channel and the surrounding structure. It specifically addresses the lateral leakage issue by sealing the contact gap, while allowing the flow channel to remain on the surface of the support ring for manufacturing simplicity. The sealing ring compensates for the harmful leakage effect without requiring complex flow channel redesign.
3Adaptability or versatility
If the hydraulic chamber volume changes under load and vibration, then the stiffness adjustment function is achieved, but sealing difficulty increases due to pressure surge
Solution Approach 1:
The sealing ring acts as a specialized intermediary component that handles the sealing challenge during dynamic operation. When the hydraulic chamber volume changes under load and vibration, the sealing ring maintains contact with the flow channel and surrounding structure, preventing leakage caused by pressure surge. This allows the stiffness adjustment function to operate reliably without compromising sealing performance.
Solution Approach 2:
The sealing ring, being a flexible component, can adapt to volume changes in the hydraulic chamber under load and vibration. Its flexibility allows it to maintain effective sealing contact despite pressure variations and dimensional changes, resolving the contradiction between adaptability for stiffness adjustment and reliability for sealing.
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
Enhances the sealing performance and stiffness adjustment, preventing fluid leakage and prolonging the service life by withstanding hydraulic pressure, while maintaining structural integrity and stability.
Implementation Method 1
A sealing device is provided at a connection between the outer casing and each of the recesses to seal each hydraulic chamber
Implementation Method 2
The first sealing element is arranged around an outer peripheral surface of the support ring, and the second sealing element is fitted with the first sealing element
Implementation Method 3
an outer casing press-fitted on the support rings from a radially outer side thereof through interference fit
Implementation Method 4
the hydraulic fluid is able to flow between said two hydraulic chambers
Data Source
AI summary
A hydraulic composite bushing, a flow channel for same, and a method for forming the flow channel, wherein the hydraulic composite bushing includes: a core shaft; a rubber member, arranged on an outer peripheral surface of the core shaft and provided with two recesses diametrically opposite to each other; two support rings arranged around the rubber member; and an outer casing press-fitted on the support rings from a radially outer side thereof through interference fit. The outer casing covers the recesses to form two hydraulic chambers for accommodating hydraulic fluid between the rubber member and the outer casing, and the support ring is provided with a flow channel for the hydraulic fluid, so that two hydraulic chambers are in communication with each other via the flow channel. A sealing device is provided at a connection between the outer casing and each of the recesses to seal each hydraulic chamber.