Universal Wheel Driving System with Extraction Gear Train
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Solution Overview
Problem
Existing vehicle driving systems face durability issues and ride comfort problems due to the unsprung mass increase and severe impacts on in-wheel motor systems, which affect performance, especially in uphill driving and acceleration.
Innovation Solution
A universal wheel driving system that includes a sun gear, ring gear, gear train, carrier, and suspension modules to decelerate input power speed, increase torque, and separate the power source from the wheel, allowing continuous power transmission without universal joints, thereby improving durability and reducing unsprung mass for enhanced ride comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an in-wheel motor type driving system is used, then the motor can be directly mounted on the driving wheel, but the unsprung mass increases causing ride comfort problems and the motor durability decreases due to severe impacts and vibrations
Solution Approach 1:
The motor is extracted from the wheel assembly and mounted separately on the vehicle body. The power transmission path is separated into two independent parts: the motor (sprung mass) and the wheel assembly (unsprung mass), connected through a gear train and carrier mechanism. This extraction eliminates the direct mounting of the motor on the wheel, thereby improving motor durability while maintaining direct power transmission capability.
2Ease of operation
If an in-wheel motor type driving system is used, then the motor can be directly mounted on the driving wheel, but the unsprung mass increases causing ride comfort problems
Solution Approach 1:
The motor is extracted from the wheel assembly and mounted separately on the vehicle body. This separation removes the heavy motor mass from the unsprung mass category, transferring it to the sprung mass category. The result is reduced unsprung mass improving ride comfort, while the power transmission function is maintained through the gear train and carrier mechanism.
3Reliability
If a universal joint is used to accommodate vertical wheel movements, then power transmission can be maintained, but the space between the power source and the wheel increases
Solution Approach 1:
The carrier mechanism is designed to dynamically adapt to vertical wheel movements. The carrier can move vertically relative to the motor while maintaining the gear train engagement, accommodating suspension travel without requiring additional space for universal joints. This dynamic adjustment maintains continuous power transmission with compact space utilization.
4Volume of moving object
If the power source is mounted close to the wheel, then space utilization is improved, but the power source is exposed to severe impacts and vibrations reducing durability
Solution Approach 1:
The motor is extracted from the wheel assembly and mounted on the vehicle body where it is protected from severe impacts and vibrations. The vertical distance between the motor and wheel is minimized through the carrier mechanism design, achieving compact space utilization without exposing the motor to harmful environmental conditions, thereby maintaining both durability and space efficiency.
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 excellent performance in uphill driving and acceleration by decelerating input power speed, increasing torque, improving power source durability, reducing unsprung mass, and maintaining continuous power transmission during vertical wheel movements, while optimizing space utilization between wheels.
Implementation Method 1
a gear train engaged to the sun gear and the ring gear and configured to allow relative movement between the rotational axes of the sun gear and the ring gear, and to generate a continuous power transmission state between the sun gear and the ring gear
Implementation Method 2
at least one suspension module configured to provide shock-absorbing and damping during relative movements of the ring gear and the carrier with respect to the sun gear
Data Source
AI summary
A universal wheel driving system includes a sun gear receiving power from a power source, a ring gear, of which a rotation axis moves relatively to a rotation axis of the sun gear on a rotation plane parallel to a rotation plane of the sun gear, the ring gear being concentrically connected to a wheel, a gear train allowing relative movement between the rotational axes of the sun and ring gears, and to generate a continuous power transmission between the sun and ring gears, a carrier forming the gear train, and supporting in position a rotation axis of a final pinion engaged with the ring gear constant with respect to the rotation axis of the ring gear, and a plurality of suspension modules providing shock-absorbing and damping during relative movements of the ring gear and carrier with respect to the sun gear.