Internal Differential Motor Shaft for Direct Wheel Drive
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Solution Overview
Problem
Conventional electric motors in motor vehicles require supplemental gear reduction to achieve high power and low RPM, and they lack the capability to accommodate different rotational speeds for left and right wheels during turns, increasing complexity and cost.
Innovation Solution
A central differential power output delivery shaft with internal axle gears, pinion gears, pinion axle, roll pin, and support bushings or bearings, allowing for differential action within the motor to directly drive wheels at different speeds while maintaining constant motor rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional electric motor is used, then the motor structure is simple, but supplemental gear reduction is required to achieve high power and low RPM, increasing system complexity
Solution Approach 1:
The patent combines the motor and differential mechanisms into a single integrated unit. The motor rotor is directly coupled with the differential case, merging two previously separate components (motor and differential) into one unified structure, thereby eliminating the need for external gear reduction systems while maintaining high power output capability
Solution Approach 2:
The motor structure is designed to perform multiple functions simultaneously. The motor not only provides rotational power but also inherently provides the differential function required for wheel speed variation during turns. This multi-functionality eliminates the need for separate supplemental gear reduction mechanisms
2Adaptability or versatility
If a conventional electric motor is used, then the motor design is straightforward, but the capability to accommodate different rotational speeds for left and right wheels during turns is lacking, requiring additional differential mechanisms
Solution Approach 1:
The differential mechanism is merged with the motor structure. The motor rotor serves as the differential case, and the pinion gears are integrated within the motor housing. This combination provides differential capability while eliminating the need for separate external differential mechanisms
Solution Approach 2:
The motor structure is designed to provide both power generation and differential functions simultaneously. The same motor components (rotor, stator, pinion gears) serve dual purposes: generating mechanical power and enabling differential action for varying wheel speeds during turns
3Power
If supplemental gear reduction is added to achieve high power and low RPM, then the power requirements are met, but the cost and complexity of the powertrain increase
Solution Approach 1:
By merging the motor and differential into a single integrated unit, the patent eliminates the need for separate supplemental gear reduction components. This reduction in component count directly lowers manufacturing costs while maintaining the required high power output capability
Solution Approach 2:
The patent extracts and eliminates the unnecessary supplemental gear reduction mechanism from the powertrain system. By taking out this redundant component and integrating its function directly into the motor structure, the system achieves high power output with reduced manufacturing complexity and cost
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 solution reduces motor vehicle powertrain complexity, enhances operating efficiency, and enables direct drive applications by integrating differential action internally within the motor, eliminating the need for external transmission components.
Implementation Method 1
The interaction between the rotor magnets and the stator coils, when energized, produces two separate radial torque components
Implementation Method 2
a pair of axle gears; (b) a pair of pinion gears
Data Source
AI summary
A central differential power output delivery shaft for a rotary motor used to deliver the power to the drive wheels in a motor vehicle application. The power delivery shaft is a hollow two piece housing which internally houses two separate independent axle shafts, one protruding from each of its ends for the purpose of providing differentiated rotation to the drive wheels of a motor vehicle. The axle shafts rotate along with the central differential power output delivery shaft and are internally operationally connected to the left hand and right drive wheels of the motor vehicle. The axle shafts are also operationally connected to each other inside the central differential power output delivery shaft housing with a geared differentiating arrangement so as to allow them to rotate at different rates with respect to one another.