Integrated Magnet Mounting for Hydrostatic Transaxle Oil Filtration
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Solution Overview
Problem
Conventional axle driving devices with hydrostatic transmissions face issues due to iron powder contamination in lubrication oil, which reduces the durability of the HST by causing damage to its sliding surfaces, and existing magnet mounting techniques are costly, complex, and inefficient in iron powder removal.
Innovation Solution
A magnet mounting structure with a reduced number of components, where the magnet is firmly fixed between the center section and the housing, increasing the iron powder absorption area and efficiency, and integrated with the oil filter to attract and hold iron powder effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plate-shaped magnets are mounted on cover plates using additional components, then the magnets can be secured, but component costs increase and assembly becomes complicated
Solution Approach 1:
The magnet holding portion is integrated directly into the center section structure, merging the magnet mounting function with the existing center section. This eliminates the need for separate cover plates and additional mounting components, thereby reducing assembly complexity while maintaining magnet fixation reliability.
Solution Approach 2:
The center section itself provides the magnet holding capability through its integrated structure, making the system self-sufficient. The center section serves dual purposes: structural support and magnet mounting, eliminating the need for external mounting components.
2Reliability
If plate-shaped magnets are mounted on cover plates, then the magnets can be secured, but component costs increase
Solution Approach 1:
By integrating the magnet holding portion into the center section, the number of discrete components is reduced. This merging of functions decreases the total component count, leading to lower manufacturing costs while maintaining the necessary magnet fixation reliability.
3Device complexity
If magnets are mounted with limited free surfaces, then the absorption area for iron powder is reduced, but the structure becomes simpler
Solution Approach 1:
The magnet holding portion is designed to expose multiple surfaces of the magnet to the lubrication oil flow path. By utilizing three-dimensional space effectively and orienting the magnet strategically within the integrated structure, multiple surfaces become accessible for iron powder attraction, increasing the effective absorption area without complicating the mounting structure.
4Device complexity
If magnets are not firmly fixed, then the structure remains simple, but the magnets may move and damage peripheral components
Solution Approach 1:
The magnet holding portion is integrated as an inherent feature of the center section, providing firm fixation through the unified structure. This integration ensures the magnet remains securely positioned during operation, preventing movement that could damage peripheral components like the oil filter, while maintaining structural simplicity.
Solution Approach 2:
The integrated magnet holding portion is designed to preemptively secure the magnet in place before any vibrational or operational forces can cause movement. This prior cushioning through structural integration prevents potential damage to surrounding 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
This solution reduces component costs, simplifies assembly, prevents magnet movement, and enhances iron powder reduction efficiency, extending the life of components and improving the overall performance of the axle driving device.
Implementation Method 1
a magnet is provided near the oil filter... attracting the iron powder to a magnet mounted within a housing
Data Source
AI summary
An axle driving device includes a hydrostatic transmission (HST) having a hydraulic pump and a hydraulic motor which are in fluid communication with one another through a closed circuit within a center section of the HST, an axle capable of being driven by driving power of various speeds from the HST, a common housing which houses the HST and the axle, wherein the center section is provided with an oil hole for supplying a working fluid to the closed circuit, the oil hole is connected to an oil filter placed in an oil reservoir within the housing, and a magnet provided near the oil filter, wherein a magnet holding portion for holding the magnet is formed integrally with the center section.