Planetary Transmission Layout With Common Ring Gear and Carrier
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Solution Overview
Problem
Existing drive devices for motor vehicles have complex transmission structures with numerous parts, making them inefficient in terms of gear ratio distribution and part duplication, which complicates the design and increases the number of components.
Innovation Solution
The solution involves connecting the first and second ring gears to form a common ring gear and the first and second planet gear carriers to form a common planet gear carrier, allowing for a simpler transmission structure with fewer parts and flexible gear ratio implementation by fixing certain components in a stationary manner or connecting them to the differential stage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate ring gears and planet gear carriers are used for first and second planet gear sets, then each gear set can operate independently, but the number of parts increases and the transmission structure becomes complex
Solution Approach 1:
The patent combines the first ring gear and second ring gear into a single common ring gear, and combines the first planet gear carrier and second planet gear carrier into a single common planet gear carrier. This merging reduces the total number of parts and simplifies the transmission structure while maintaining the functionality of both planet gear sets through selective clutch engagement.
2Adaptability or versatility
If separate ring gears and planet gear carriers are used for first and second planet gear sets, then each gear set can operate independently, but the number of parts increases
Solution Approach 1:
The patent merges the first ring gear and second ring gear into a single common ring gear, and merges the first planet gear carrier and second planet gear carrier into a single common planet gear carrier. This reduces the part count from four separate components (first ring gear, second ring gear, first planet gear carrier, second planet gear carrier) to two shared components, directly addressing the issue of excessive quantity of parts.
3Adaptability or versatility
If multiple separate components are used in the transmission, then gear ratio options are abundant, but the design becomes complicated and manufacturing efficiency decreases
Solution Approach 1:
By combining ring gears and planet gear carriers into common shared components, the patent reduces manufacturing complexity and improves production efficiency while maintaining diverse gear ratio options through the selective engagement of first and second clutches with the common planet gear carrier and common ring gear.
Solution Approach 2:
The common ring gear and common planet gear carrier serve multiple functions: they support both the first planet gear set and the second planet gear set, enabling multiple gear ratios through different clutch engagement combinations. This multi-functionality maintains design versatility while simplifying manufacturing.
Data Source
AI summary
A drive device for a motor vehicle has an electric drive machine which is operatively connected to a transmission via a driveshaft. The transmission has at least first and second planet gear stages and a differential stage. The first planet gear stage has a first planet gear set with planet gears rotatably arranged on a first planet gear carrier and mesh with a first sun gear and a first ring gear. The second planet gear stage has a second planet gear set with planet gears rotatably arranged on a second planet gear carrier and mesh with a second sun gear and a second ring gear. The planet gear stages are operatively connected to a double clutch device with first and second power-shift clutches, the ring gears are rigidly connected together to form a common ring gear, and the planet gear carriers are rigidly connected together to form a common planet gear carrier.