Roller-Mounted Drive Unit Bearing Layout for Low Drag Loss
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Solution Overview
Problem
Existing motor vehicle drive systems face a trade-off between achieving high efficiency and long service life, as rigid bearing arrangements reduce drag losses but increase sensitivity to axis spacing errors, while non-adjusted bearings reduce sensitivity but increase efficiency losses.
Innovation Solution
A roller-bearing-mounted motor vehicle drive system with a traction transmission apparatus that includes a fixed/floating bearing arrangement for transmission shafts, utilizing deep groove ball bearings and cylindrical roller bearings to support shafts, allowing for efficient power transmission with reduced displacement and drag losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an adjusted bearing arrangement is used to achieve rigid supporting of transmission shafts, then shaft displacement is reduced, but drag losses increase and efficiency decreases
Solution Approach 1:
The bearing arrangement is segmented into multiple functional zones: fixed bearings at one end provide rigid support with low displacement, while floating bearings at the other end provide flexible support with low drag losses. This segmentation allows each bearing type to optimize for its specific function, resolving the contradiction between rigidity and efficiency.
Solution Approach 2:
Different bearing characteristics are applied to different locations along the transmission shafts. Fixed bearings are positioned where rigid support is critical (near gear mesh points), while floating bearings are positioned where flexibility is beneficial. This local differentiation of bearing quality allows the system to achieve both low displacement and low drag losses simultaneously.
2Ease of manufacture
If conventional bearing arrangements are used, then ease of manufacture is improved, but service life and efficiency are reduced
Solution Approach 1:
The bearing arrangement transitions from static conventional designs to a dynamic fixed/floating configuration. The floating bearings can adapt their position and load distribution based on operating conditions, automatically optimizing for both efficiency and service life while maintaining ease of manufacture through standardized bearing components.
3Stability of the object's composition
If multiple bearing points are used to reduce displacement, then shaft stability is improved, but drag losses and complexity increase
Solution Approach 1:
The fixed and floating bearing arrangements are merged into a unified support system that works together to provide both stability and efficiency. The fixed bearings handle rigid support functions while floating bearings handle flexible support functions, creating a combined system that achieves shaft stability without proportionally increasing complexity.
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 system achieves high efficiency and stable support of transmission shafts with reduced drag losses and improved stiffness, enhancing the overall performance and longevity of the drive system.
Implementation Method 1
a first roller bearing (10) and a second roller bearing (11) are provided as floating bearings of the fixed/floating bearing arrangements of the traction transmission drive shaft (1), traction transmission output shaft (2)
Implementation Method 2
The system achieves high efficiency and stable support of transmission shafts, reducing drag losses and enhancing the service life of the drive system by optimizing the bearing arrangement
Data Source
AI summary
A motor vehicle drive system has a traction transmission device. A traction transmission drive shaft is rotatably mounted in a transmission device housing. A traction transmission intermediate shaft is rotatably mounted in the transmission housing. A traction transmission output shaft is rotatably mounted in the transmission housing device, and is arranged axially parallel to and radially spaced apart from the two other traction transmission shafts. The motor vehicle drive system is characterized in that three traction transmission shafts are each mounted in the traction transmission housing device with a fixed/floating bearing, these bearings each having a fixed bearing for absorbing axial forces and at least one floating bearing designed exclusively to absorb radial forces. The three fixed bearings are mounted in the traction transmission cover, and at least three of the floating bearings are mounted in the traction transmission housing.