Liquid-Sealed Vibration Prevention Device Axial Retention
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Solution Overview
Problem
The existing liquid-sealed vibration prevention devices require complex manufacturing processes and increased costs due to the need for bending work to achieve axial retention and positioning of the intermediate sleeve relative to the outer cylinder.
Innovation Solution
A liquid-sealed vibration prevention device with an inner cylinder, intermediate sleeve, main rubber elastic body, and outer cylinder, where the intermediate sleeve features a projection part that contacts the seal rubber layer to restrict axial displacement and rotation-stop parts for circumferential positioning, simplifying the structure and reducing manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bending work is performed on the lower part of the outer cylinder to create an inner flange for axial retention, then the intermediate sleeve can be retained in the axial direction, but the manufacturing process becomes complex and manufacturing cost increases
Solution Approach 1:
Instead of bending the outer cylinder inward to create an inner flange for retention, the invention inverts the approach by providing a projection part on the intermediate sleeve that extends upward to contact the seal rubber layer on the outer cylinder's inner circumferential surface. This reversal of the retention mechanism eliminates the need for complex bending work while achieving the same axial retention function.
Solution Approach 2:
The invention extracts the retention function from the outer cylinder structure and transfers it to the intermediate sleeve through the projection part. By taking out the bending work requirement from the manufacturing process and replacing it with a simple projection feature on the intermediate sleeve, the complexity is reduced while maintaining the retention function.
2Manufacturing precision
If bending work is performed on the lower part of the outer cylinder to create an inner flange for positioning, then the intermediate sleeve can be positioned in the axial direction, but the manufacturing process becomes complex and manufacturing cost increases
Solution Approach 1:
Instead of creating an inner flange by bending the outer cylinder to achieve axial positioning, the invention inverts the approach by adding a projection part on the intermediate sleeve that contacts the seal rubber layer. This provides precise axial positioning without requiring complex bending operations on the outer cylinder.
Solution Approach 2:
The intermediate sleeve's projection part performs the positioning function autonomously by contacting the seal rubber layer on the outer cylinder. This self-service mechanism eliminates the need for externally imposed bending work on the outer cylinder, simplifying the manufacturing process while maintaining positioning precision.
3Reliability
If the intermediate sleeve is retained by an inner flange formed by bending the outer cylinder, then axial retention is achieved, but the structure becomes complex
Solution Approach 1:
The invention inverts the retention structure by placing the active element (projection part) on the intermediate sleeve rather than creating a passive retention feature (inner flange) on the outer cylinder. This simplifies the overall structure while maintaining reliable axial retention through the projection-seal rubber layer contact.
Solution Approach 2:
Instead of modifying the entire outer cylinder structure through bending to create an inner flange, the invention applies a localized solution by adding a projection part only where needed on the intermediate sleeve. This localized approach reduces structural complexity while achieving the same retention function.
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 device effectively achieves axial retention, positioning, and rotation-stop of the intermediate sleeve relative to the outer cylinder with a simple structure, reducing manufacturing costs and complexity.
Implementation Method 1
a main rubber elastic body which is interposed between the inner cylinder and the intermediate sleeve to elastically connect the inner cylinder with the intermediate sleeve
Implementation Method 2
the projection part slidingly contacts with (abuts on) the seal rubber layer to restrict the displacement
Data Source
AI summary
A liquid-sealed vibration prevention device is provided with a main rubber-elastic body for elastically connecting an inner cylinder with an intermediate sleeve, an outer cylinder for sheathing the intermediate sleeve, and a seal rubber layer positioned on the inner-circumferential surface of the outer cylinder. The intermediate sleeve has an upper ring part, and the upper end face of the upper ring part is provided with an inclined projection part which extends diagonally upward toward the inner cylinder. Moreover, a pair of rotation-stop rubbers that holds the inclined projection part in the circumferential direction of the intermediate sleeve is provided on the inner side of an annular recess of the outer cylinder and on the upper part side of the seal rubber layer.