Nested Sleeve Stator for Friction Clutch Cooling
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Solution Overview
Problem
Existing built stator designs for friction clutches face high manufacturing costs and inefficiencies in sealing and oil flow, particularly in managing cooling oil at low pressure with high volume flow and pressure oil at high pressure with low volume flow, leading to issues with wall friction, acoustic problems, and sealing challenges.
Innovation Solution
A stator design featuring an outer sleeve-shaped component and an inner sleeve-shaped component nested together, with a separate bore in the outer sleeve for pressure medium supply and a coolant duct formed by both sleeves, allowing for a large coolant cross-section and narrow sealing surfaces, reducing manufacturing costs and improving sealing and flow efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple bores are drilled in the stator to achieve sufficient total flow cross section for cooling oil, then the cooling oil flow is improved, but the wall friction increases and manufacturing costs increase
Solution Approach 1:
The stator is divided into an outer sleeve-shaped component and an inner sleeve-shaped component that are arranged nested one inside the other. The coolant duct is formed by the combination of the inner lateral surface of the outer sleeve and the outer lateral surface of the inner sleeve, creating a segmented structure that provides large flow cross section with reduced wall friction compared to multiple drilled bores.
2Quantity of substance
If multiple bores are drilled in the stator to achieve sufficient total flow cross section, then the cooling oil flow is improved, but manufacturing costs increase
Solution Approach 1:
The stator is segmented into outer and inner sleeve components. The coolant duct is formed by the nested arrangement of these components, eliminating the need for multiple drilled bores. This segmented design reduces manufacturing complexity and costs while maintaining sufficient cooling oil flow cross section.
3Ease of manufacture
If a built stator design with nested sleeves is used to reduce manufacturing costs, then manufacturing is simplified, but sealing between different grooves becomes critical or impossible
Solution Approach 1:
The pressure oil supply bore is extracted as a separate feature formed entirely in the outer sleeve component, independent of the inner sleeve. This separation allows the coolant duct and pressure oil supply to be independently sealed and manufactured, eliminating the sealing challenges between intersecting grooves in traditional built stator designs.
4Quantity of substance
If cooling oil ducts are formed by nested sleeves, then the cross section can be very large, but the sealing surface becomes narrow which reduces sealing effectiveness
Solution Approach 1:
The pressure oil supply bore is taken out as a separate feature in the outer sleeve, allowing the coolant duct to maintain its large cross section formed by the nested sleeves. The sealing challenges are addressed by independent sealing of the extracted pressure oil supply path, preventing leakage while preserving the large cooling oil flow area.
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 design reduces manufacturing costs and enhances sealing and flow efficiency by allowing a large coolant cross-section and streamlined chamfers, minimizing wall friction and noise, while ensuring tight pressure oil supply with minimal hydraulic cross-section requirements.
Implementation Method 1
the high wall friction (and the associated high frictional resistance for the oil) because of the large number of drill holes that are necessary to achieve a sufficient total flow cross section
Implementation Method 2
the contact oil (with high pressure but low volume flow) must also be fed through the milled grooves in the known designs of 'built' stators
Data Source
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AI summary
The present invention describes a stator for a friction clutch with wet-running lamellae, wherein the clutch is mounted on the stator, and the stator supplies the clutch with cooling and pressure medium, wherein the stator has an outer sleeve-shaped component (100) and an inner sleeve-shaped component (101), which components are arranged nested one in the other, wherein an inner circumferential surface of the outer sleeve-shaped component together with the outer circumferential surface of the inner sleeve-shaped component define at least one cooling medium guide channel, and wherein the outer sleeve-shaped component has at least one bore (104, 105) which is separate from the cooling medium guide channel as a supply channel for pressure medium for controlling the clutch, and said bore is completely formed in the outer cylindrical component without the involvement of the inner cylindrical component.