Rotary Seal Slip Ring Layout for Soil Compactor Power Transfer
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Solution Overview
Problem
Existing construction machines face challenges in providing a simple and reliable electrically conductive connection between rotating and non-rotating system areas, particularly in soil compactors, which are prone to contamination and lubricant leakage.
Innovation Solution
A construction machine with a rotatable system area is connected via a conductor connection that includes a sealing arrangement with electrically conductive sliding rings and bearing units, ensuring a tight seal and electrical conductivity between rotating and non-rotating components, using metallic materials for stability and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a line connection with sealing arrangement is used to establish electrical connection between rotating and non-rotating system areas, then reliability of electrical connection and prevention of contamination is improved, but device complexity increases due to the need for mechanical seals and multiple line paths
Solution Approach 1:
The patent applies multi-functionality by making the mechanical seal serve dual purposes: it provides both the sealing function to prevent contamination and lubricant leakage, and simultaneously provides the electrical conduction function through electrically conductive sliding rings. This eliminates the need for separate wireless transmission systems and integrates multiple functions into a single component structure.
Solution Approach 2:
The patent merges the sealing arrangement with the electrical connection system by integrating electrically conductive sliding rings into the mechanical seal structure. The first and second sliding rings are positioned within the sealing arrangement and pressed into axial contact, creating a unified component that achieves both sealing and electrical conduction without requiring separate systems.
2Device complexity
If wireless energy transmission is used between rotating and non-rotating system areas, then device complexity is reduced, but transmission reliability and efficiency deteriorates
Solution Approach 1:
The patent replaces wireless electromagnetic transmission with a mechanical contact-based electrical connection system. The electrically conductive sliding rings provide direct physical contact for electrical energy and signal transmission, eliminating the need for wireless transmission components while ensuring reliable and efficient energy transfer through stable mechanical contact.
3Reliability
If electrically conductive materials are used for sliding rings to ensure electrical conductivity, then electrical connection reliability is improved, but friction and wear increase compared to non-conductive materials
Solution Approach 1:
The patent employs composite material strategy by selecting electrically conductive materials for the sliding rings that balance electrical conductivity with wear resistance. The first and second sliding rings are made of electrically conductive materials and are designed with appropriate surface properties to minimize friction while maintaining electrical conduction, thereby extending the service life of the mechanical seal.
Solution Approach 2:
The patent applies prior cushioning by pressing the first and second sliding rings into axial contact with each other through the sealing arrangement, ensuring stable and consistent contact pressure. This pre-established contact ensures reliable electrical connection while distributing wear evenly, preventing sudden failures and extending the duration of action of the sliding rings.
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 provides a reliable and sealed electrical connection, preventing contamination and lubricant leakage while enabling efficient energy and signal transmission between rotating and non-rotating parts, eliminating the need for costly wireless systems.
Implementation Method 1
The first sliding ring and the second sliding ring are supported against each other in the direction of the rotation axis, rotatable relative to each other about the rotation axis... the first sliding ring be electrically connected to the at least one first electrical unit by means of a first connecting line, and that the second sliding ring be electrically connected to the at least one second electrical unit by means of a second connecting line
Implementation Method 2
the second line path comprises at least one bearing unit which supports the rotating system region rotatably about the axis of rotation with respect to a non-rotating system region carried with respect to the machine frame... The at least one bearing unit can comprise a rolling element bearing with a bearing outer ring made of electrically conductive material, a bearing inner ring made of electrically conductive material, and a plurality of rolling elements made of electrically conductive material
Data Source
Figure 1~2
Figure 3~4
AI summary
A construction machine, in particular a soil compactor, comprising at least one system area (24) rotatable about an axis of rotation (D) with respect to a machine frame (22) and at least one first electrical unit (78) on the rotatable system area (24), wherein the at least one first electrical unit (78) is electrically connected by means of a conductor connection (82) to at least one second electrical unit (80) carried outside the rotatable system area (24) with respect to the machine frame (22), is characterized in that the conductor connection (82) comprises a first conductor path (84), wherein the first conductor path (84) comprises at least one sealing arrangement (56) tightly closing the rotatable system area (24) with respect to a non-rotating system area (42) carried with respect to the machine frame (22).