Planetary Gear Assembly Integrated in Traction Motor
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Solution Overview
Problem
Existing planetary gear assemblies are application-specific and limited by parameters such as input angular velocity, torque, and operating speed, restricting their use to a few applications, and there is a need for increased efficiency and compactness in electric motor systems.
Innovation Solution
A vehicle system incorporating a planetary gear assembly with a configurable position relative to the rotor and housing, allowing for multiple gear ratios and a compact design that integrates the planetary gear assembly within the electric motor assembly to enhance torque output without increasing the system's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a planetary gear assembly is designed with a specific gear ratio for a particular application, then the output rotation achieves the required torque and angular velocity characteristics, but the assembly becomes application-specific and cannot be utilized in multiple applications
Solution Approach 1:
The planetary gear assembly is designed with a universal structure that can accommodate multiple gear ratios through different configurations of the same basic components. The sun gear, planet gears, and ring gear can be arranged in different fixed/rotating combinations to achieve various gear ratios, allowing one assembly to serve multiple applications rather than requiring separate assemblies for each application.
Solution Approach 2:
The patent employs dynamic configuration where the fixed element (sun gear, planet carrier, or ring gear) can be changed based on the desired gear ratio. This dynamic reconfiguration allows the same planetary gear assembly to adapt to different torque and speed requirements across multiple applications without requiring completely different designs.
2Power
If the planetary gear assembly is designed to handle high torque and speed requirements, then the output performance is improved, but the assembly occupies more space
Solution Approach 1:
The planetary gear assembly is positioned within the internal spaces of the electric motor assembly, nesting the gear components inside the motor housing. This allows the gear assembly to utilize the existing structural space of the motor, achieving high torque output without proportionally increasing the overall system size.
Solution Approach 2:
The patent positions the planetary gear assembly in a three-dimensional arrangement within the motor's internal volume, utilizing radial and axial spaces efficiently. By arranging components in multiple dimensions rather than simply expanding in one direction, the design achieves high power density without linearly increasing the assembly's external dimensions.
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
The system achieves multiple gear ratios and high torque output in a compact form, enabling its use in various applications, including hybrid and electric vehicles, by positioning the planetary gear assembly within the motor's internal spaces, thus optimizing space usage and efficiency.
Implementation Method 1
The sun gear has a toothed exterior periphery and defines a central axis. The planet gears each have a toothed exterior periphery that is configured to mesh with the toothed exterior periphery of the sun gear. The ring gear, which is sometimes referred to as an annulus, has a toothed interior periphery that is configured to mesh with the toothed exterior periphery of the planet gears.
Implementation Method 2
an electric traction motor, a planetary gear assembly coupled to the electric traction motor
Data Source
AI summary
A vehicle includes a chassis, a traction member associated with the chassis, and a drive system associated with the chassis and the traction member comprising an electric traction motor, a planetary gear assembly coupled to the electric traction motor, the planetary gear assembly comprising an output member coupled to the traction member, wherein rotation of the output member provides a drive torque for the traction member.