Nested Rolling Bearing Layout for Compact Torque Transmission
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Solution Overview
Problem
Existing torque transmitting systems for electrically drivable motor vehicles require significant axial space due to the arrangement of rotary bearings, which is costly and inefficient for manufacturing, especially when considering the need for a long tool run-out for producing toothing connections.
Innovation Solution
A torque transmitting system with radially offset rotary bearings, where one bearing is nested inside the other, allowing for minimal axial installation space and enabling cost-effective production through sufficient tool run-out for toothing manufacturing, using a ring gear as the torque transmitting element and a hollow cylindrical shoulder for support, with a helical toothing for efficient torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotary bearings are arranged axially adjacent to each other to support the torque transmitting element, then the torque transmission function is achieved, but the axial installation space requirement increases significantly
Solution Approach 1:
The patent applies nesting by placing one rotary bearing inside the other bearing's inner ring, with the first rotary bearing's outer ring resting on the second rotary bearing's inner ring. This nested arrangement allows both bearings to occupy the same axial space, dramatically reducing the axial installation space requirement while maintaining the torque transmission function through dual bearing support.
2Ease of manufacture
If axial space is reduced by nesting bearings, then manufacturing cost decreases, but the tool run-out space for producing toothing connections becomes insufficient
Solution Approach 1:
The patent resolves the conflict between reduced axial space and sufficient tool run-out space by utilizing the radial dimension. The nested bearing arrangement reduces axial space occupation, while the radial extent of the nested bearing structure provides adequate tool run-out space in the radial direction for producing toothing connections on the torque transmitting element.
3Reliability
If conventional axial bearing arrangement is used, then bearing support function is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the functions of two rotary bearings by arranging them in a nested configuration where one bearing is placed inside the other. This combined nested arrangement maintains the load-bearing and support functions of both bearings while reducing overall structural complexity and manufacturing cost compared to conventional axial arrangements requiring separate mounting spaces.
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 low axial space requirements and cost-effective production of toothing connections, ensuring efficient torque transmission between internal combustion engines and electric drive devices while maintaining structural simplicity.
Implementation Method 1
The torque transmitting element is supported by means of rolling bearings, in particular by means of two rolling bearings, on the support element
Data Source
AI summary
A torque transmitting system, a drive unit, and a drive assembly are provided. The torque transmitting system includes a torque transmitting element and a support element which supports it via rotary bearings. The torque transmitting element has a first connection device for coupling to a first assembly in a rotationally fixed manner and a second connection device for coupling to a second assembly. One of the two elements forms a substantially hollow cylindrical shoulder, and the respective other element forms the outer cylindrical face and, correspondingly thereto, the inner face of a hollow cylinder radially outwards. The shoulder is arranged between the outer face and the inner face in a radial direction. A first rotary bearing is arranged between the outer face and the shoulder, and a second rotary bearing is arranged between the shoulder and the inner face. By using the torque transmitting system, less axial installation space is.