Planetary Gear Reducer for Compact EV Transmission
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Solution Overview
Problem
Conventional electric vehicle transmission systems using gear-train type reducers are bulky, heavy, and inefficient, leading to reduced fuel efficiency and increased production costs, while also posing challenges in compact design and weight distribution.
Innovation Solution
The implementation of a planetary gear type reducer in electric vehicle transmission systems, enabling first-gear shifting, second-gear shifting, and reverse-gear shifting, which reduces torque variation, minimizes impact on internal components, and allows for a compact, balanced design with optimized fuel efficiency and reduced production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a gear-train type reducer is adopted in electric vehicle transmission, then the transmission can provide reduction gear ratio, but the system becomes expanded in size and increased in weight
Solution Approach 1:
The patent combines the first-stage and second-stage reduction functions into a single planetary gear type reducer. The planetary gear mechanism integrates multiple gear trains in a compact configuration, where the sun gear, planetary gears, and ring gear work together to achieve both reduction stages simultaneously, eliminating the need for separate gear-train reducers and reducing overall weight.
Solution Approach 2:
The planetary gear structure employs a nested configuration where planetary gears are arranged around the sun gear and engage with the ring gear, creating a compact, space-efficient design. This nested arrangement allows multiple gear elements to occupy overlapping spatial zones, achieving high reduction ratios in a small volume and reducing the transmission system's overall footprint and weight.
2Power
If a gear-train type reducer is adopted in electric vehicle transmission, then the transmission can provide reduction gear ratio, but the fuel efficiency is reduced
Solution Approach 1:
By merging the first-stage and second-stage reduction functions into a single planetary gear reducer, the patent reduces the number of mechanical components and power transmission paths. This consolidation minimizes energy losses associated with multiple gear meshings and reduces the overall weight of the transmission system, thereby improving fuel efficiency while maintaining the required reduction gear ratio.
3Power
If a gear-train type reducer is adopted in electric vehicle transmission, then the transmission can provide reduction gear ratio, but the production costs are increased
Solution Approach 1:
The patent consolidates multiple reduction stages into a single planetary gear assembly, reducing the total number of parts that need to be manufactured, assembled, and maintained. This merging of functions simplifies the manufacturing process, reduces inventory requirements, and lowers production costs while still achieving the necessary reduction gear ratio for electric vehicle operation.
4Ease of operation
If the forward-gear shifting part and reverse-gear shifting part are distributed into the left and right sides of the planetary gear carrier, then the gear-shifting control is improved, but the height of the electric vehicle increases
Solution Approach 1:
The patent distributes the forward-gear shifting part and reverse-gear shifting part to opposite sides of the planetary gear carrier along the horizontal axis rather than stacking them vertically. This dimensional reorganization maintains effective gear-shifting control while minimizing the vertical height of the transmission system, thereby preserving the vehicle's ground clearance and overall height.
Data Source
AI summary
An electric vehicle transmission system is disclosed. The electric vehicle transmission system is employing a planetary gear type speed reducer so as to implement first-gear shifting, second-gear shifting, or reverse shifting, thereby enabling reduced manufacturing costs of an electric vehicle while increasing the fuel efficiency of the electric vehicle, and also employing the planetary gear type speed reducer so as to implement forward and reverse shifting, thereby enabling reduced manufacturing costs of the electric vehicle while increasing the fuel efficiency of the electric vehicle.