Single-Ring Seal Structure for Compact Construction Machinery
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Solution Overview
Problem
Existing seal devices for construction machinery, such as floating seal devices, require multiple seal rings and increased size to achieve high sealing performance and durability, which limits their downsizing potential.
Innovation Solution
A seal device configuration that includes a single seal ring with an elastically deformable elastic ring pressing the seal surface against a rotating member, allowing for reduced size while maintaining high sealing performance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a floating seal device with multiple seal rings is used to ensure high sealing performance and durability, then the sealing performance is improved, but the device size increases
Solution Approach 1:
The patent merges the functions of multiple seal rings into a single seal ring structure. The first and second seal rings are integrated into one component that simultaneously seals both interfaces (between the first member and second member, and between the second member and third member), thereby reducing the overall number of components and device size while maintaining sealing effectiveness.
Solution Approach 2:
The single seal ring is designed to perform multiple sealing functions simultaneously. It seals between the first member and second member at one interface, and between the second member and third member at another interface, making it a multi-functional sealing component that replaces what would traditionally require multiple separate seal rings.
2Reliability
If a floating seal device with multiple seal rings is used to ensure high sealing performance and durability, then the sealing performance is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple seal rings into a single integrated seal ring structure, reducing the total number of components that need to be manufactured, assembled, and maintained. This merging simplifies the device structure while preserving the sealing functionality across multiple interfaces.
Solution Approach 2:
The single seal ring is designed to fulfill multiple sealing roles simultaneously, eliminating the need for separate seal rings for different interfaces. This multi-functionality reduces device complexity by consolidating what would otherwise require multiple specialized components.
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 proposed seal device achieves high sealing performance and durability while being downsized, making it suitable for use in construction machinery without compromising on functionality.
Implementation Method 1
an elastically deformable elastic ring disposed between the inner circumferential surface of the first member and the outer circumferential surface of the seal ring. The elastic ring presses the seal surface of the seal ring against the second member
Data Source
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AI summary
The present disclosure relates to a sealing device and a construction machine. The seal device (70) includes a first member (13), a second member (60), a seal ring (71), and an elastic ring (72). The first member (13) has an inner circumferential surface. The second member (60) rotates relative to the first member (13). The second member (60) faces the first member (13) in a rotation axis direction. The seal ring (71) has an outer circumferential surface facing the inner circumferential surface in a radial direction and spaced apart from the inner circumferential surface. The seal ring (71) has a sealing surface in sliding contact with the second member (60). An elastically deformable elastic ring (72) is disposed between the inner circumferential surface of the first member (13) and the outer circumferential surface of the seal ring (71). The elastic ring (72) presses the seal surface of the seal ring (71) against the second member (60) to seal between the seal surface and the second member (60).