In-wheel Motor Powertrain with Planetary Reduction
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Solution Overview
Problem
Existing in-wheel motor powertrains face challenges in achieving a compact configuration for mountability on vehicles while ensuring sufficient reduction ratio and durability to provide adequate driving force, particularly for commercial vehicles and low-floor buses.
Innovation Solution
The powertrain incorporates an input gear, an output gear, an intermediate gear with specific pitch circle diameters, and a single-pinion simple planetary reduction mechanism, along with a lubrication pump, to achieve a high reduction ratio and compact design, allowing for efficient power transmission and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a relatively large reduction ratio is used to transmit motor power to driving wheels, then sufficient driving force is achieved, but the configuration becomes less compact and mounting space is reduced
Solution Approach 1:
The planetary reduction mechanism is integrated within the in-wheel motor assembly, with the sun gear connected to the motor output shaft, planet gears rotating around the sun gear, and the ring gear connected to the wheel hub. This nested configuration allows the reduction mechanism to be contained within the motor housing volume, achieving high reduction ratio without increasing overall mounting space
Solution Approach 2:
The patent transitions from traditional axial gear arrangements to a planetary gear system that utilizes radial space around the motor shaft. By arranging gears in a radial configuration rather than linearly along the shaft, the design achieves high reduction ratio while maintaining a compact axial footprint suitable for in-wheel motor applications
2Volume of moving object
If the powertrain configuration is made compact to ensure mountability, then vehicle integration is improved, but the reduction ratio and durability may be compromised
Solution Approach 1:
The planetary reduction mechanism is integrated within the in-wheel motor assembly, with the sun gear connected to the motor output shaft, planet gears rotating around the sun gear, and the ring gear connected to the wheel hub. This nested configuration allows the reduction mechanism to be contained within the motor housing volume, achieving high reduction ratio without increasing overall mounting space
Solution Approach 2:
The patent combines the motor housing and reduction mechanism housing into a single integrated structure. The motor stator is mounted on the housing, and the planetary reduction mechanism is integrated within the same housing, merging multiple functional components into a unified assembly that maintains compactness while ensuring structural durability
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 ensures mountability on compact vehicles, achieves a high reduction ratio, and enhances durability, thereby securing sufficient driving force for commercial vehicles and low-floor buses.
Implementation Method 1
a planetary reduction mechanism of which one of three rotating elements is concentrically connected to the output gear and another one of the three rotating elements is connected to a wheel hub
Implementation Method 2
an intermediate gear integrally and concentrically provided with a first gear meshed with the input gear, and a second gear meshed with the output gear
Implementation Method 3
A pump gear meshes with the input gear and a lubrication pump may be connected to the pump gear
Data Source
AI summary
An in-wheel motor powertrain includes an input gear directly connected to a motor; an output gear disposed parallel to the input gear; an intermediate gear integrally and concentrically provided with a first gear meshed with the input gear and a second gear meshed with the output gear having a pitch circle diameter different from that of the first gear; a planetary reduction mechanism of which one of three rotating elements is concentrically connected to the output gear and another one of the three rotating elements is connected to a wheel hub.