Transfer Gear Oil Level Control via Chain Guide
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Solution Overview
Problem
Transfer gears in motor vehicles experience efficiency losses and increased oil temperature due to churning losses caused by the lower chain wheel and chain passing through the oil sump, which reduces the effectiveness of lubrication and cooling.
Innovation Solution
A closure mechanism is introduced that adjusts the oil level by actuating a torque transmission device, ensuring oil supply only when required, thereby reducing churning losses by controlling the outlet opening between the oil reservoir and sump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lower chain wheel dips into the oil sump to convey lubricating oil, then lubrication is provided, but churning losses increase and efficiency decreases
Solution Approach 1:
A chain guide is introduced as an intermediary component to direct the chain and lower chain wheel through the oil sump. The chain guide has an outlet opening that controls oil flow, allowing the chain to pick up oil efficiently while minimizing unnecessary churning. This mediator structure separates the oil pickup function from the harmful churning effect.
Solution Approach 2:
The outlet opening of the chain guide can be adjusted or designed with specific dimensions to control the amount of oil available to the chain. By changing the oil flow parameter (through the outlet opening size), the system optimizes the balance between providing sufficient lubrication and minimizing churning losses in the oil sump.
2Reliability
If the chain conveys oil from the oil sump, then lubricating oil is supplied to lubrication points, but oil temperature increases due to churning
Solution Approach 1:
The chain guide acts as a mediator that facilitates oil pickup while reducing the chain's direct contact with large volumes of oil. By controlling the outlet opening, the chain guide limits the amount of oil churning, thereby reducing the temperature increase caused by viscous heating during oil conveyance.
3Loss of energy
If the outlet opening is restricted to reduce churning losses, then energy efficiency improves, but oil supply to lubrication points may be insufficient
Solution Approach 1:
The outlet opening dimensions and characteristics are specifically designed or adjusted to optimize the balance between oil flow quantity and churning loss. The parameter of the outlet opening (size, shape, position) is tuned to provide sufficient oil to the chain for effective lubrication while minimizing the oil volume that causes harmful churning in the sump.
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 effectively minimizes churning losses and maintains efficient lubrication and cooling, enhancing the energy efficiency and reliability of the transfer gear.
Implementation Method 1
the chain of the chain drive can serve as an oil delivery device. For this purpose, the lower chain wheel dips into an oil sump filled with lubricating oil, wherein lubricating oil is conveyed out of the oil sump in the direction of the upper chain wheel by means of the chain
Implementation Method 2
the lower chain wheel dips into an oil sump filled with lubricating oil
Implementation Method 3
At the upper end of the chain drive, the lubricating oil is thrown off the chain
Data Source
AI summary
The present invention relates to a transfer gear having an input shaft, a first output shaft, a second output shaft, and a torque transmission device which has a clutch in order to distribute a drive torque introduced via the input shaft selectively to the first output shaft and the second output shaft, wherein a drive acts between the torque transmission device and the second output shaft, and wherein an oil reservoir is provided for collecting the lubricating oil.