High-Speed Clutch Lubrication Mechanism for On-Demand Cooling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing transmission systems face challenges in delivering adequate and controlled cooling lubrication to clutch packs, particularly due to the tight packaging of transmission units, which leads to inefficiencies and potential overheating.
Innovation Solution
A lubrication mechanism is introduced that includes a cooling fluid shutoff piston, which moves between closed and open positions based on the engagement status of the clutch assembly. When the clutch is disengaged, the piston blocks the lubrication supply to prevent unnecessary cooling, and when engaged, it allows cooling fluid to flow to the clutch pack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If continuous cooling lubrication is supplied to the clutch pack, then the clutch pack is adequately cooled, but pump energy is wasted when the clutch is not in use
Solution Approach 1:
The lubrication mechanism transitions from a static continuous supply system to a dynamic controlled supply system. The cooling fluid shutoff piston moves between open and closed positions based on clutch engagement status, allowing the system to adapt its lubrication flow dynamically. This resolves the contradiction by enabling adequate cooling when needed while preventing energy waste when the clutch is idle.
Solution Approach 2:
The system uses the clutch piston's own movement during engagement to automatically control the lubrication flow. When the clutch piston moves to engage the clutch pack, it automatically opens the lubrication passage, and when disengaged, it closes the passage. This self-regulating mechanism eliminates the need for external control systems while optimizing both cooling effectiveness and energy efficiency.
2Volume of moving object
If tight packaging is used in the transmission unit, then space is efficiently utilized, but it becomes difficult to deliver sufficient cooling fluid flow to the clutch pack
Solution Approach 1:
The lubrication mechanism is nested within the existing clutch assembly structure. The cooling fluid shutoff piston is positioned within the clutch piston, and the lubrication passages are integrated into the clutch pack cavity. This nested arrangement allows the system to maintain tight packaging while providing adequate cooling fluid flow paths through the compact clutch assembly.
3Stability of the object's composition
If a balance piston is added to provide centrifugal balance, then clutch piston stability is improved, but device complexity increases
Solution Approach 1:
The balance piston and lubrication control functions are merged into a single integrated assembly. The balance piston is positioned within the clutch piston, and its presence enables both centrifugal balancing and automatic lubrication control through its interaction with the cooling fluid shutoff piston. This merging reduces overall device complexity compared to having separate systems for balancing and lubrication control.
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 ensures efficient cooling of the clutch pack only when needed, reducing pump energy consumption and prolonging the lifespan of the clutch pack by managing fluid flow effectively.
Implementation Method 1
a first fluid pressure is within the clutch piston cavity
Implementation Method 2
The passageway is in fluid communication with the balance piston cavity and the lubrication supply opening
Implementation Method 3
Prior art transmission utilize a balance piston to provide a centrifugal balance to the clutch piston
Implementation Method 4
Cooling is particularly important for certain heat-producing components (e.g., brakes, clutches and the like)
Implementation Method 5
A clutch pack of a clutch assembly may generate a considerable amount of heat when utilized to clutch the transmission unit, particularly during periods of relative contacting rotation between the separator plates and the rapidly rotating friction disks as a result of friction
Data Source
AI summary
A lubrication mechanism is provided for a transmission unit having a balance piston. The lubrication mechanism is movable between a closed position when a clutch assembly is disengaged which prevents cooling flow of lubrication to a clutch pack of the clutch assembly, and an open position when the clutch assembly is engaged which provides for a cooling flow of lubrication to the clutch pack. In both positions, lubrication is supplied to a balance piston cavity between the clutch assembly and the balance piston.