Central Differential Gear Torque Distribution for Four-Wheel Drive
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Solution Overview
Problem
Existing differential gear systems for automobiles are limited in their ability to efficiently distribute high drive torque to multiple wheels, particularly when cornering, and struggle to maintain balanced wheel revolutions.
Innovation Solution
A differential gear arrangement featuring a central differential gear connected to two pairs of differential gears, each driving a pair of wheels, with a bevel gear configuration that allows for efficient torque distribution and compensation for different wheel revolutions, and an electrically controllable actuator for dynamic power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single differential gear is used to drive two wheels, then the structure is simple, but the ability to distribute high drive torque to four wheels is limited
Solution Approach 1:
The single differential gear is segmented into multiple differential gears (first differential gear for first wheel pair, second differential gear for second wheel pair). Each differential gear independently handles torque distribution to its respective wheel pair, enabling the system to distribute high drive torque to all four wheels while maintaining manageable structural complexity through modular design.
2Speed
If drive torque is distributed to multiple wheels, then acceleration performance improves, but the complexity of torque distribution mechanism increases
Solution Approach 1:
Multiple differential gears are merged into a single integrated torque distribution system. The first and second differential gears work together with the drive shaft to form a unified mechanism that distributes torque to all four wheels simultaneously, achieving high acceleration performance while consolidating the torque distribution function into a compact arrangement.
3Volume of moving object
If a compact differential gear arrangement is used, then space utilization improves, but the ability to compensate for different wheel revolutions during cornering may be compromised
Solution Approach 1:
The differential gear arrangement utilizes three-dimensional spatial configuration to achieve compact volume. The first and second differential gears are positioned at different locations and orientations within the housing, allowing each to independently compensate for wheel revolution differences during cornering while maintaining a compact overall structure through efficient use of available space.
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
Enables high acceleration and efficient power transmission to all four wheels, ensuring balanced wheel operation and improved maneuverability with a compact and symmetrical structure.
Implementation Method 1
The differential gear arrangement according to the invention features a central differential gear connected to two pairs of differential gears, each driving a pair of wheels, with a bevel gear configuration that allows for efficient torque distribution
Data Source
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AI summary
The invention relates to a differential gear arrangement for an automobile for distributing a drive torque to at least two wheels, comprising a gearbox housing, a drive shaft which introduces a drive torque into the gearbox housing, and at least two opposing output elements arranged laterally on the gearbox housing for the wheels of a wheel axle.According to the invention, a first pair of first output elements for driving a first pair of wheels of a first wheel axle and a second pair of second output elements for driving a second pair of wheels of a second wheel axle are arranged on the gearbox housing, a first differential gear is provided in the gearbox housing for the first pair of wheels of the first wheel axle and a second differential gear for the second pair of wheels of the second wheel axle, and a central differential gear is arranged between the first differential gear and the second differential gear, which is connected to the first differential gear and the second differential gear for distributing the drive torque to the two wheel axles.