Seal Device with Elastic Ring 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 high sealing performance and durability while reducing the device's size.
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 reliability is improved, but the device size increases
Solution Approach 1:
The patent combines multiple sealing functions into a single seal ring by integrating an elastic ring directly onto the seal ring structure. The elastic ring is fitted into a groove on the seal ring's outer circumference, creating a unified component that performs both sealing and elastic deformation functions, eliminating the need for separate seal rings
Solution Approach 2:
The patent changes the physical state of the sealing component by introducing an elastically deformable ring that can dynamically adjust its shape and pressure. The elastic ring deforms under pressure to maintain continuous contact with the sealing surface, providing adaptive sealing that compensates for dimensional variations and wear
2Reliability
If a floating seal device with multiple seal rings is used to ensure high sealing performance and durability, then the sealing reliability is improved, but the device complexity increases
Solution Approach 1:
The patent merges the seal ring and elastic sealing element into a single integrated component. The elastic ring is directly fitted into a groove on the seal ring, creating a unified structure that reduces the number of discrete parts while maintaining the dual-functionality of rigid support and elastic sealing
Solution Approach 2:
The integrated seal ring structure serves multiple functions simultaneously: it provides structural support, maintains sealing pressure, and compensates for dimensional variations. The single component performs what previously required multiple specialized parts, simplifying the overall device architecture
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 compact, making it suitable for use in construction machinery where space is limited.
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 to seal between the seal surface and the second member.
Data Source
AI summary
The present disclosure relates to a sealing device and a construction machine. The seal device includes a first member, a second member, a seal ring, and an elastic ring. The first member has an inner circumferential surface. The second member rotates relative to the first member. The second member faces the first member in a rotation axis direction. The seal ring 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 has a sealing surface in sliding contact with the second member. An elastically deformable elastic ring is 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 to seal between the seal surface and the second member.