Hydrostatic Transmission Oil Cooling with Guided Flow Ribs
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Solution Overview
Problem
Existing oil cooling apparatuses for hydrostatic transmissions require a separate oil cooler, which reduces spatial efficiency and increases manufacturing costs due to the need for additional space and components.
Innovation Solution
An integrated oil cooling apparatus that includes a cooling main body coupled to the transmission case, an accommodating groove, a cover unit, supply and discharge ports, guide ribs, and hurdle units to enhance oil flow velocity and heat transfer, eliminating the need for a separate oil cooler.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a separate oil cooler is installed to cool the oil, then the oil cooling function is achieved, but the spatial efficiency is reduced and manufacturing cost increases
Solution Approach 1:
The patent integrates the oil cooling function directly into the transmission case by forming a cooling cavity within the transmission case body. The transmission case serves dual purposes: housing the hydrostatic transmission components and providing the cooling cavity for oil circulation and heat dissipation. This eliminates the need for a separate oil cooler, reducing system complexity while maintaining effective oil cooling.
2Temperature
If a separate oil cooler is installed to cool the oil, then the oil cooling function is achieved, but the manufacturing cost increases
Solution Approach 1:
The cooling cavity is formed as an integral part of the transmission case through casting or machining processes. By combining the cooling function with the transmission case structure, the patent eliminates the need for separate oil cooler components, reducing part count, assembly complexity, and manufacturing costs while maintaining effective oil cooling capability.
3Productivity
If hurdle units are added to increase oil flow velocity, then heat transfer is improved, but device complexity increases
Solution Approach 1:
The cooling cavity is divided into multiple flow regions by positioning guide ribs and hurdle units at different locations. This segmentation creates a multi-path circulation pattern that increases oil flow velocity and enhances heat transfer efficiency. The guide ribs and hurdle units are strategically placed to segment the flow without requiring complex external components.
Solution Approach 2:
The patent utilizes the three-dimensional space within the transmission case by positioning guide ribs and hurdle units at different heights and locations. This spatial arrangement creates vertical and horizontal flow paths, utilizing the depth and width of the cooling cavity to maximize heat transfer surface area and oil circulation efficiency without increasing external dimensions.
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
Improves spatial efficiency, reduces manufacturing costs, and enhances oil cooling performance by increasing heat transfer through the cover unit and guide ribs, while preventing excessive oil pressure and maintaining component integrity.
Implementation Method 1
heat transfer due to convection is increased, the amount of heat transferred from the oil to a cover unit, guide ribs, the first hurdle unit, the second hurdle unit, and the like can be increased
Implementation Method 2
heat transfer due to convection is increased, the amount of heat transferred from the oil to a cover unit, guide ribs, the first hurdle unit, the second hurdle unit, and the like can be increased
Data Source
AI summary
The present invention relates to an oil cooling apparatus for hydrostatic transmissions that includes a cooling main body coupled to a transmission case in which a hydrostatic transmission is installed; an accommodating groove formed in the cooling main body to accommodate oil; a cover unit coupled to the cooling main body to cover the accommodating groove; a supply port configured to supply the oil to the accommodating groove; a discharge port configured to discharge the oil from the accommodating groove; a plurality of guide ribs installed at positions spaced apart from each other to guide a flow direction of oil flowing along a flow path formed in the accommodating groove; a first hurdle unit coupled to at least one of the guide ribs to form a first flow region through which the oil passes; and a second hurdle unit coupled to at least one of the guide ribs to form a second flow region through which the oil passes.