Automotive Actuator Evoloid Gearing for Compact High Reduction
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Solution Overview
Problem
Existing actuators for automotive applications require a compact design while achieving high transmission ratios, often necessitating multiple gear stages which increase complexity and weight.
Innovation Solution
Implementing an Evoloid toothing directly at the input of the powertrain between the electric motor's drive shaft and the output gear, allowing for single-stage transmission and potentially incorporating supplementary gear stages with spur or oblique toothings to achieve compactness and high torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple gear stages are used to achieve high transmission ratios, then the transmission ratio is improved, but the device complexity and weight increase
Solution Approach 1:
The patent merges the functions of multiple gear stages into a single Evoloid toothing stage. The Evoloid pinion and Evoloid output gear directly engage to provide the complete transmission ratio reduction, eliminating the need for separate worm gear and Evoloid pinion stages. This consolidation achieves high transmission ratios while reducing device complexity and component count.
Solution Approach 2:
The Evoloid toothing utilizes a three-dimensional tooth profile geometry that enables high transmission ratios in a single stage. The Evoloid surface geometry allows for compact design with large reduction ratios by engaging the pinion and output gear in a configuration that maximizes torque transmission while minimizing the number of stages required.
2Power
If multiple gear stages are used to achieve high transmission ratios, then the transmission ratio is improved, but the weight of the actuator increases
Solution Approach 1:
By combining multiple gear stages into a single Evoloid toothing stage, the patent eliminates redundant components, housings, and mounting structures. This merger significantly reduces the overall weight of the actuator while maintaining the required high transmission ratio for motor vehicle closing devices.
3Power
If Evoloid toothing is implemented centrally in the powertrain, then high transmission ratios are achieved, but the installation space increases
Solution Approach 1:
The Evoloid toothing configuration enables compact installation by utilizing efficient three-dimensional space utilization. The direct engagement between the Evoloid pinion on the drive shaft and the Evoloid output gear creates a space-efficient transmission system that reduces the overall volume required compared to multi-stage arrangements.
Data Source
AI summary
An application, in particular for motor vehicle closing devices. The basic design of the motor vehicle has an electric motor and an actuating element which is acted upon by the electric motor directly or indirectly via a powertrain. The powertrain is provided with at least one Evoloid toothing. According to the invention, a drive shaft of the electric motor is equipped with an Evoloid pinion which meshes with an Evoloid output gear at the input of the powertrain, thereby directly producing the Evoloid toothing.