Compact Five-Speed Planetary Transmission Design
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Solution Overview
Problem
Conventional planetary gear transmissions require a large installation footprint due to the need for multiple gear sets to achieve a wide range of speed ratios, often limiting the number of reverse speed ratios available.
Innovation Solution
A compact transmission system utilizing five planetary gear sets, four brakes, and two clutches to achieve five forward speeds and four reverse speeds, with specific brake and clutch configurations allowing selective actuation to control speed and direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple planetary gear sets are used to achieve a wide range of speed ratios, then the number of forward speeds is increased, but the installation footprint increases and the number of reverse speeds is limited
Solution Approach 1:
The patent merges five planetary gear sets into a single integrated transmission system where common components (sun gears, ring gears, carriers) are shared between adjacent gear sets. This consolidation allows the system to achieve five forward speeds and four reverse speeds within a compact footprint, resolving the contradiction between providing multiple speed ratios and maintaining a small installation area.
2Adaptability or versatility
If multiple planetary gear sets are used to provide multiple reverse speeds, then the versatility is improved, but the device complexity increases
Solution Approach 1:
The patent designs the planetary gear sets with multi-functionality where the same physical components serve multiple purposes. The common sun gears, ring gears, and carriers are used across different gear sets to provide both forward and reverse speeds. This universal design allows four reverse speeds to be achieved without adding proportional complexity, as the same hardware structure serves multiple functional requirements.
Data Source
AI summary
A compact five-speed transmission planetary gear train includes a first, second, third, fourth and fifth planetary gear sets between an input and an output as well as first, second, third and fourth brakes and first and second clutches. The first, second, third and fourth brakes and first and second clutches are selectively actuatable to provide five different forward speeds and a plurality of different reverse speeds between the input and the output.