Torque Vectoring Device with Axial Motor and Uniaxial Structure
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Solution Overview
Problem
Existing torque vectoring devices face challenges in downsizing while preventing passive rotation of actuators, leading to reduced power transmission efficiency and increased complexity, especially when trying to fit within the constraints of vehicle systems.
Innovation Solution
A torque vectoring device with a differential mechanism and reversing mechanism that allows coaxial rotation of first and second rotary shafts, featuring a speed increasing gear set and speed reducing gear set to absorb speed differences and control torque distribution ratios, while maintaining a simple uniaxial structure to prevent passive actuator rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the control motor is arranged radially outer side of the ring gears, then the torque vectoring device can be configured, but the size of the drive gear unit increases
Solution Approach 1:
The control motor is arranged axially inside the ring gears rather than radially outside, changing the spatial dimension from radial arrangement to axial arrangement. This dimensional change allows the control motor to be positioned within the existing radial space of the planetary gear unit, thereby reducing the overall radial size of the drive gear unit while maintaining functionality.
2Force
If a speed reducing mechanism of large speed reducing ratio is arranged between the control motor and the ring gear, then the control motor torque can be increased, but the size of the drive gear unit increases
Solution Approach 1:
The carrier is designed to serve dual functions: it acts as both the carrier for the planetary gears and as the reaction element for the control motor. This multi-functionality eliminates the need for a separate speed reducing mechanism, as the carrier directly receives and transmits the control motor torque to the ring gear, thereby increasing control motor torque without adding additional components that would increase size.
3Volume of moving object
If the reversing motor is disposed between the sun gears with dual-axis structure, then the drive gear unit can be downsized in radial direction, but the structure becomes more complicated
Solution Approach 1:
The reversing motor is completely removed from the system and replaced by the control motor arranged axially inside the ring gear. This extraction eliminates the complex dual-axis structure entirely, simplifying the overall design while achieving the same torque vectoring function through a more straightforward single-axis configuration.
4Volume of moving object
If additional speed reducing mechanism is arranged to downsize the reversing motor, then the radial size may be reduced, but the reversing motor structure becomes more complicated and difficult to fit within outer diameter
Solution Approach 1:
The reversing motor is completely removed and replaced by the control motor integrated with the carrier. This eliminates the need for additional speed reducing mechanisms and complex dual-axis structures, achieving compact radial size through a simplified single-axis design where the control motor torque is directly transmitted through the carrier to the ring gear.
Data Source
AI summary
A downsized torque vectoring device in which a passive rotation of an actuator is prevented. A torque vectoring device comprises: a differential mechanism that allows a differential rotation between a first rotary shaft and second rotary shaft; an actuator that applies torque to the differential mechanism to rotate the rotary shafts at different speeds; and a reversing mechanism that allows the rotary shafts to rotate in opposite directions. The reversing mechanism comprises a first control gear set and the second rotary shaft arranged coaxially around the rotary shafts, and gear ratios of the first control gear set and the second control gear set are set to different values. A speed increasing gear set and a speed reducing gear set are arranged between a prime mover and an output shaft of the actuator, and ring gears of the speed increasing gear set and the speed reducing gear set are connected to each other.