Gearwheel Oil Return Layout for Low-Sump Vehicle Transmissions
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Solution Overview
Problem
Transmission devices with separated oil sumps and bunkers experience undesirably high oil levels in the sump, leading to splash losses and reduced fill quantity in the bunker.
Innovation Solution
A partition separates the oil sump from the bunker, with an oil return device comprising a wiper and outlet on opposite sides of the partition, connected by a fluid connection, passively returning oil to the bunker using the gearwheel's rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the oil sump is separated from the oil bunker by a partition, then constructive requirements and lubrication performance are improved, but the oil level in the oil sump becomes excessively high
Solution Approach 1:
A wiper element is introduced as an intermediary component that bridges the partition-separated oil sump and oil bunker. The wiper removes excess oil from the gearwheel and directs it through a conduit from the sump side to the bunker side, mediating the oil distribution between the two separated chambers and preventing excessive oil accumulation in the sump.
2Ease of manufacture
If the oil sump is separated from the oil bunker by a partition, then constructive requirements are improved, but splash losses increase
Solution Approach 1:
The wiper element acts as an intermediary that controls oil flow from the sump to the bunker, preventing excessive oil in the sump that would cause splash losses. By regulating the oil distribution through the partition, the system maintains constructive separability while minimizing energy-wasting splashing.
3Ease of manufacture
If the oil sump is separated from the oil bunker by a partition, then constructive requirements are improved, but the fill quantity in the oil bunker is reduced
Solution Approach 1:
The wiper and conduit system serves as an intermediary mechanism that actively transports oil from the sump chamber to the bunker chamber. This ensures that the oil bunker receives adequate oil supply despite the partition separation, maintaining proper fill quantity while preserving the constructive advantages of separation.
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
Prevents high oil levels in the sump while minimizing construction space and weight, effectively reducing splash losses and maintaining oil fill quantity in the bunker.
Implementation Method 1
at least one wiper for wiping the oil from the gearwheel
Data Source
AI summary
A transmission device for a motor vehicle includes a gearwheel space, a gearwheel received in the gearwheel space and having at least one oil bunker for supplying oil for lubricating the gearwheel, and at least one oil return device. The oil is conveyable from the oil bunker into the gearwheel space. At least one oil sump for catching the oil is arranged in the gearwheel space. At least one partition is arranged between the oil bunker and the oil sump for separating the oil sump from the oil bunker. The at least one oil return device includes at least one wiper for wiping the oil from the gearwheel and at least one outlet for removing the wiped oil into the oil bunker. The wiper and the outlet are arranged on different sides of the at least one partition and are connected by at least one fluid connection.