Liquid Sealed Vibration Isolator Relief Valve Alignment
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Solution Overview
Problem
Existing liquid sealed vibration isolating devices for motor vehicle power trains face challenges in preventing cavitation phenomena and maintaining high damping performance due to issues with relief valve alignment, deformation, and hydraulic fluid flow, which affect the accuracy of rotation prevention and damping force.
Innovation Solution
A liquid sealed vibration isolating device with a partitioned primary and secondary liquid chamber, featuring a thin-walled movable diaphragm section and a thick-walled outer circumferential section with a noncircular detent section and a pair of oppositely arranged relief valves, along with taper-shaped engaging sections for improved alignment and sealing, and an intermediate support for the relief valve to prevent excessive deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the projection serving as the detent means is increased in size to provide high rigidity, then the prevention of rotation becomes accurate, but the size of the relief valve is restricted
Solution Approach 1:
The detent means is segmented into multiple projections distributed around the outer circumferential section, with each projection engaging with a corresponding engaging section. This segmentation allows the detent function to be distributed across multiple smaller engagement points rather than requiring a single large projection, thus maintaining rotation prevention accuracy while preserving relief valve size.
2Quantity of substance
If four relief valves are provided at regular intervals, then the relief flow is maintained, but the number of resisting portions increases
Solution Approach 1:
Multiple relief valves are merged into a single integrated relief valve structure with multiple valve sections. Each valve section corresponds to a projection and can open independently, combining the relief functions of multiple valves into one unified component. This reduces the number of separate resisting portions while maintaining the total relief flow capacity.
3Productivity
If the relief valve is made as large as possible, then the flow of hydraulic liquid is maintained, but the projection size is restricted
Solution Approach 1:
The outer circumferential section is designed with localized thick-walled projections that provide high rigidity precisely where needed for the detent engagement, while the remaining portions maintain the relief valve's large size for adequate flow capacity. This local quality differentiation allows simultaneous optimization of both rotation prevention accuracy and hydraulic flow.
4Reliability
If the elastic body rotates relative to the frame member, then the relief valve may be out of alignment, but the detent construction should prevent this
Solution Approach 1:
The projection and engaging section act as intermediary detent elements that mediate between the elastic body and frame member to prevent relative rotation. These intermediary features provide a mechanical stop that ensures proper alignment of the relief valve with the relief passage without requiring complex assembly procedures.
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 solution ensures stable prevention of cavitation phenomena and maintains high damping performance by ensuring accurate relief valve operation, reducing the number of resisting portions, and enhancing sealing performance, allowing for smoother hydraulic fluid flow and increased hydraulic liquid flow during relief.
Implementation Method 1
the reversal of vibration direction after great force input develops negative pressure within a primary liquid chamber so as to produce bubbles in a hydraulic liquid. Then, a high noise may be produced by a cavitation phenomenon that these bubbles burst.
Implementation Method 2
A central section of the elastic body is formed as a thin-walled circular movable diaphragm section so as to absorb the hydraulic pressure fluctuation of the primary liquid chamber
Implementation Method 3
This relief valve is opened at the time of such great force input that the cavitation phenomenon occurs, to relieve the hydraulic liquid so that the occurrence of the cavitation phenomenon is prevented
Data Source
AI summary
A partition member is provided with an elastic body for absorbing hydraulic pressure fluctuation of the primary liquid chamber and a frame member for supporting an outer circumferential portion of the elastic body while aiming to prevent the rotation of the elastic body. A relief aperture communicating between the primary liquid chamber and the secondary liquid chamber is located on the outer circumferential side in the elastic body supporting region of the frame member. A relief valve for opening and closing the relief aperture is integrally formed on the outer circumferential side of the elastic body. The relief valve is formed of a pair of right and left relief valves. A width across flat sections are formed on a thick-walled outer circumferential section of the elastic body which is located between the right and left relief valves, such as to serve as a detent means.