Axial Space Reduction in Motor Drive Mechanisms
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Solution Overview
Problem
Existing drive mechanisms for motor vehicles lack compactness and optimal acoustic properties, and often require additional space for gearing elements, which hinders efficient mounting and energy transformation between the stator and rotor.
Innovation Solution
The drive mechanism features an angular gearing that overlaps with the winding head of the stator and rotor, incorporating conical gears and a planetary gearing to reduce axial space requirements and enhance mounting, while ensuring a compact design and low noise operation through rotational speed reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the angular gearing is arranged separately from the winding head, then the mounting of gearing elements is simplified, but the axial space requirement increases and compactness is reduced
Solution Approach 1:
The angular gearing is merged with the winding head by arranging the gearing elements within the radial extent of the winding head. The first conical gearing element is mounted on the rotor and the second conical gearing element is mounted on the driven shaft, with both elements positioned to overlap with the winding head when viewed in the longitudinal direction, thereby eliminating the need for separate axial space for the angular gearing.
Solution Approach 2:
The solution transitions from a separate axial arrangement to a radial overlapping arrangement. By positioning the angular gearing elements within the radial extent of the winding head and arranging them to overlap in the longitudinal direction, the patent utilizes the radial dimension to accommodate the gearing without increasing axial space requirements.
2Length of moving object
If the angular gearing is positioned to overlap with the winding head, then compactness is improved and axial space is reduced, but the mounting complexity increases
Solution Approach 1:
The angular gearing is segmented into two separate conical gearing elements: a first conical gearing element mounted on the rotor and a second conical gearing element mounted on the driven shaft. This segmentation allows each element to be independently positioned and mounted, simplifying the overall arrangement while achieving the overlapping configuration with the winding head.
3Shape
If additional space is allocated for angular gearing elements, then mounting is easier, but the overall device size and weight increase
Solution Approach 1:
The angular gearing elements are nested within the radial extent of the winding head. The first conical gearing element is positioned on the rotor within the winding head's radial boundary, and the second conical gearing element is positioned on the driven shaft similarly nested within the winding head's radial extent, creating a compact nested arrangement that eliminates additional space requirements.
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 configuration achieves a compact and acoustically advantageous drive mechanism by reducing space requirements and allowing for efficient energy transformation, enabling both motor and generator operations with improved mounting and noise reduction.
Implementation Method 1
The electrical machine provides a stator and a rotor. The rotor is mounted rotatably about the axis of rotation with respect to the stator... In the former case, the electric machine is supplied with electrical energy for providing the driving torque. In the generator operation, on the other hand, a torque present on the driven shaft is used to provide electrical energy.
Data Source
AI summary
A drive mechanism for a motor vehicle, with a driven shaft and an electric machine, including a stator as well as a rotor mounted rotatably about an axis of rotation with respect to the stator, the rotor being coupled by way of an angular gearing to the driven shaft. An electrical winding of the stator and/or an electrical winding of the rotor projects in the axial direction, with respect to the axis of rotation, beyond a coil former to form a winding head and the angular gearing is arranged overlapping with the winding head at least in regions, when viewed in the axial direction.