Vehicle Door Drive Transmission Coupling for Torque Alignment and Sealing
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Solution Overview
Problem
Existing door drive devices for vehicles face challenges in achieving a simple construction for coupling gear stages while ensuring torque-resistance, proper alignment, low-friction, low-noise operation, and moisture resistance.
Innovation Solution
A door drive device with a two-stage transmission system featuring an intermediate element that connects the first and second gear stages in a torque-resistant manner, centers the housing parts, and provides a sealed transition between them, using engagement and form-fitting portions to ensure proper alignment and moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the first housing part and the second housing part are directly connected, then the construction is simple, but torque resistance and alignment precision are insufficient
Solution Approach 1:
An intermediate element is introduced between the first housing part and the second housing part to serve as a mediator. This intermediate element includes engagement portions that connect to both housing parts, providing torque-resistant connection while ensuring precise alignment through form-fitting engagement features.
2Strength
If the housing parts are rigidly connected for torque resistance, then torque resistance is improved, but moisture sealing is compromised
Solution Approach 1:
The connection structure is segmented into multiple functional portions: engagement portions for torque-resistant mechanical connection and sealing portions for moisture sealing. The intermediate element is divided into a first engagement portion, a first sealing portion, a second engagement portion, and a second sealing portion, allowing independent optimization of each function.
Solution Approach 2:
Different regions of the intermediate element have different properties: the engagement portions are designed for mechanical strength and torque resistance, while the sealing portions are designed with sealing properties (such as O-ring grooves or sealing lips) to prevent moisture ingress. Each portion is optimized for its specific local function.
3Manufacturing precision
If multiple connection elements are used for torque resistance and alignment, then alignment precision is improved, but device complexity increases
Solution Approach 1:
The intermediate element is designed as a multi-functional component that simultaneously provides: (1) torque-resistant connection through engagement portions, (2) precise alignment through form-fitting features, and (3) moisture sealing through sealing portions. This single component replaces what would otherwise require multiple separate elements.
Data Source
AI summary
A door drive device for electromotively adjusting a vehicle door comprises an electric motor, a transmission which includes a first gear stage to be driven by the electric motor and a second gear stage operatively connected to the first gear stage, and an output element operatively connected to the second gear stage for outputting an adjusting force for adjusting the vehicle door. The first gear stage includes a first housing part. The second gear stage includes a planetary transmission to be driven by the first gear stage and a second housing part forming a ring gear toothing of the planetary transmission. The transmission includes an intermediate element which is arranged between the first housing part and the second housing part and connects the first housing part and the second housing part with each other in a torque-resistant manner.