Combining Transmission Oil-Level Separation for Low Splashing Loss
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Solution Overview
Problem
Existing drive systems face challenges in generating high torque while minimizing oil splashing losses and maintaining efficient lubrication, as they often suffer from excessive oil levels and associated frictional heat and wear.
Innovation Solution
A drive system featuring a summing gear driven by electric motors with a gap seal that maintains a lower oil level, allowing oil to flow only as necessary for lubrication and cooling, combined with an open encapsulation design that directs oil upwards for collection, reducing splashing losses and enabling high torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high oil level is maintained in the summing gear for adequate lubrication, then lubrication is improved, but splashing losses and frictional heat increase
Solution Approach 1:
The transmission system is divided into two separate lubrication zones: the gear interior with higher oil level for thorough lubrication, and the summing gear interior with lower oil level to minimize splashing. The gap seal creates a boundary between these zones, allowing each to operate at its optimal oil level independently.
Solution Approach 2:
Different oil levels are maintained in different spatial locations within the transmission system. The gear interior maintains a higher oil level for adequate lubrication of gear teeth, while the summing gear interior maintains a lower oil level to reduce splashing losses, with each location optimized for its specific functional requirements.
2Loss of energy
If a gap seal is used to separate oil levels between summing gear and gear, then splashing losses are reduced, but frictional heat and wear increase
Solution Approach 1:
The gap seal provides partial sealing rather than complete separation, allowing a controlled amount of oil to pass through. This partial action reduces frictional heat and wear compared to absolute tight sealing, while still maintaining the beneficial low oil level in the summing gear to minimize splashing losses.
3Loss of energy
If the encapsulation is closed tightly to maintain low oil level, then splashing losses are minimized, but oil flow and lubrication are restricted
Solution Approach 1:
The gap seal acts as an intermediary element between the summing gear interior and the gear interior. It partially restricts oil flow to maintain low oil level and minimize splashing losses, while still allowing sufficient oil passage to ensure adequate lubrication of the summing gear 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
The solution effectively reduces oil splashing losses, minimizes frictional heat, and ensures durable operation by maintaining a low oil level in the summing gear, while allowing adequate lubrication and cooling, thus enhancing the drive's efficiency and torque transmission capabilities.
Implementation Method 1
a gap seal is arranged between the interior of the summing gear and the interior of the gear, in particular which has such a narrowly dimensioned gap that when the drive is operated, the oil level in the interior of the summing gear is lower than in the interior of the gear
Implementation Method 2
the rotating toothed parts convey the oil upwards out of the encapsulation, the toothed parts arranged above the oil level being adequately lubricated
Implementation Method 3
the oil level in the interior of the summing gear is lower than in the interior of the gear
Data Source
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AI summary
The invention relates to a drive, having a combining transmission driven by electric motors (1) and a transmission driven by same, wherein there is a lower oil level (105, 106) inside the combining transmission than inside the transmission, in particular during operation of the drive.