Electric Vehicle Driving System Using Planetary Gear Speed Regulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electric vehicles face challenges with complex and heavy gearbox structures, high manufacturing costs, short mileage, and poor power performance due to limited battery capacity and motor power, hindering their widespread adoption.
Innovation Solution
The electric vehicle driving system replaces the traditional gearbox with a single row planetary gear mechanism and a speed regulating motor, connected to an energy-storage device and a primary motor, allowing for efficient speed regulation and energy utilization, enabling a simple, compact, and cost-effective power assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional gearbox is used in the driving system, then speed regulation can be achieved, but the structure becomes complex, weight increases, and manufacturing cost rises
Solution Approach 1:
The patent divides the driving system into two independent motor units: a first motor unit with a single-row planetary gear mechanism for speed regulation, and a second motor unit without gears for direct torque provision. This segmentation eliminates the need for a complex multi-speed gearbox while maintaining speed regulation capability through the planetary mechanism.
Solution Approach 2:
The single-row planetary gear mechanism serves multiple functions: it provides speed regulation, acts as a differential mechanism, and enables both motors to contribute to power delivery. The brake mechanism also serves dual purposes by controlling the planetary gear operation and enabling energy recovery during regenerative braking.
2Ease of operation
If a conventional gearbox is used in the driving system, then speed regulation can be achieved, but assembly difficulty increases and manufacturing cost rises
Solution Approach 1:
The driving system is segmented into modular units that can be assembled independently. The first motor unit with its integrated planetary gear mechanism can be assembled and tested separately from the second motor unit, simplifying the overall assembly process and reducing manufacturing complexity.
Solution Approach 2:
The patent extracts the speed regulation function from a complex multi-speed gearbox and implements it through a simplified single-row planetary gear mechanism controlled by a brake. This extraction maintains the essential speed regulation capability while dramatically reducing assembly difficulty and manufacturing cost.
3Device complexity
If limited battery capacity and motor power are used, then the driving system remains simple, but mileage becomes short and power performance deteriorates
Solution Approach 1:
The brake mechanism dynamically controls the operation of the planetary gear mechanism, enabling the system to adapt between different operating modes. This dynamic control allows optimal power distribution from both motors to maximize energy utilization and extend endurance mileage while maintaining system simplicity.
Solution Approach 2:
The single-row planetary gear mechanism acts as an intermediary that enables both motors to contribute effectively to power delivery. It mediates between the first motor's regulated power and the second motor's direct power, optimizing energy utilization and extending the vehicle's endurance mileage without increasing battery capacity.
4Device complexity
If limited battery capacity and motor power are used, then the driving system remains simple, but power performance becomes poor
Solution Approach 1:
The brake mechanism dynamically switches between different power delivery modes, allowing the system to maximize power output when needed. During high-power demands, the brake releases to enable the planetary gear mechanism to deliver regulated power from the first motor, while the second motor provides additional direct power, achieving superior power performance without complex system architecture.
Solution Approach 2:
The patent merges the output of two independent motor units through the planetary gear mechanism. The first motor provides regulated power through the planetary gears, while the second motor provides direct power, and their combined output delivers superior power performance while maintaining relative system simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration results in a system with easy assembly, reduced weight, and improved power performance and endurance, enhancing the electric vehicle's mileage and overall efficiency.
Implementation Method 1
The planetary gears on the planetary carrier individually mesh the gear ring and the sun gear
Data Source
AI summary
An electric vehicle driving system includes an energy-storage apparatus (1), a first motor (2), a speed regulating motor (3) and a single row planetary mechanism. Said first motor (2) and said speed regulating motor (3) are connected electrically to the energy-storage apparatus (1). The single row planetary mechanism includes a sun gear (4), a gear ring (5) and a planetary carries (6) with planetary gears (7). The planetary gears (7) in the planetary carrier (6) mesh the gear ring (5) and the sun gear (4) separately. The output axle of the first motor (2) is connected to the gear ring (5), and the output axle of the speed regulating motor (3) is connected to the sun gear (4) by a brake (8). The invention takes the speed regulating motor and the single row planetary mechanism instead of the gearbox in a transmission driving system, and achieves a simple and compact structure, easy assemble, light weight, and low manufacturing cost. With the speed regulation of the speed regulating motor, the first motor works in high efficiency speed range, which increases energy utilization rate and endurance mileage.