Evoloid Gear Drive Unit for Motor Vehicles
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Solution Overview
Problem
Existing drive units for motor-vehicle applications require significant design effort and multiple parts to achieve high torque and efficient guidance, leading to a complex and heavy structure due to the need for multiple gear stages and additional guiding mechanisms.
Innovation Solution
Incorporating a single evoloid gear stage between the electric motor's worm and drive wheel, along with a double cam arrangement on the drive wheel, which allows for a high reduction ratio and compact design, enabling high torque transmission without additional guiding means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If multiple gear stages are used to achieve high torque, then the torque transmission capability is improved, but the device complexity and weight increase
Solution Approach 1:
The patent combines the functions of multiple gear stages into a single evoloid gear stage, which achieves the same high torque multiplication (reduction ratio of 10:1 to 30:1) without requiring multiple separate gear mechanisms. This merging of functions reduces the number of parts and simplifies the overall drive unit structure while maintaining the required torque transmission capability.
2Manufacturing precision
If additional guiding mechanisms are added to ensure perfect guidance of the actuation rod, then the guidance precision is improved, but the device complexity and weight increase
Solution Approach 1:
The actuation rod's guidance is achieved through its own geometric interaction with the evoloid gear stage and cam mechanism. The rod's rectangular cross-section engages with corresponding recesses in the gear stage, providing inherent guidance without requiring separate guide rails or additional guiding components. This self-guiding approach maintains precision while reducing overall system complexity.
3Device complexity
If a compact design with fewer parts is used, then the weight and design effort are reduced, but the torque transmission capability may be compromised
Solution Approach 1:
The evoloid gear stage employs a specialized tooth profile geometry that enables high reduction ratios (10:1 to 30:1) in a single stage. By changing the geometric parameters of the gear teeth according to the evoloid curve, the mechanism achieves compact dimensions while maintaining the torque multiplication capability that would traditionally require multiple gear stages.
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 reduces design complexity and weight while achieving high torque transmission with reduced parts, providing a compact, efficient, and corrosion-free solution for motor-vehicle applications.
Implementation Method 1
the electromotive drive has at least one evoloid gear stage. As a rule, only a single evoloid gear stage is realized. This is advantageously located between a worm on a drive shaft of an electric motor and the drive wheel
Implementation Method 2
a worm on a drive shaft of an electric motor and the drive wheel
Implementation Method 3
the drive operates eccentrically on the actuation rod and, for this purpose, a drive cam of the drive engages in a drive cut-out in the actuation rod, wherein further a guide cam engaging in a guide cut-out in the actuation rod is provided
Data Source
AI summary
A drive unit for motor-vehicle applications, comprising an electromotive drive and an actuation rod which is mounted, at one end, on the drive and is acted upon by the drive. The drive acts eccentrically on the actuation rod, wherein for this purpose a drive cam of the drive engages in a drive cut-out of the actuation rod. Moreover, a guide cam, which engages in a guide cut-out in the actuation rod, is provided. The drive cam and the guide cam are arranged at a drive wheel of the electromotive drive. According to the invention, the electromotive drive has at least one evoloid gear stage.