Positive Drive Differential With Overrunning Clutch for Smooth Cornering
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Solution Overview
Problem
Current four-wheel drive systems face challenges in maintaining optimal wheel rotation during turns, leading to wheel slip or skid, which results in premature wear due to the inability of wheels on a common axle to rotate differentially.
Innovation Solution
A positive drive differential assembly with a bi-directional overrunning clutch assembly, including a pinion gear, roller clutch assemblies, and hubs with recessed channels, allows independent rotation of wheels by transmitting torque and enabling one wheel to overrun while maintaining drive to the other, preventing slip and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wheels are fixed to a common drive axle, then torque can be transmitted to both wheels, but differential rotation is not permitted causing wheel slip or skid during turns
Solution Approach 1:
The drive axle is segmented into two independent half-axles, each capable of rotating at different speeds. The differential gear system divides the torque transmission path, allowing each wheel to rotate independently while still receiving power from the common drive source.
Solution Approach 2:
A differential mechanism acts as an intermediary between the common drive shaft and the two wheels. This intermediary device redistributes torque between the wheels based on their rotational speed differences, enabling smooth cornering while maintaining traction.
2Ease of operation
If a conventional differential is used to allow differential rotation, then cornering is improved, but one wheel may be driven faster or slower than optimum
Solution Approach 1:
The differential system dynamically adjusts the torque distribution to each wheel based on real-time rotational speed differences. During cornering, the system automatically allows the outer wheel to rotate faster while maintaining optimal drive to the inner wheel, optimizing performance for varying operating conditions.
3Reliability
If a bi-directional overrunning clutch is used, then positive drive is achieved, but the structure becomes more complex
Solution Approach 1:
The overrunning clutch mechanism automatically engages and disengages based on the direction and magnitude of torque applied to each wheel. The system self-regulates without external control, using the inherent mechanical properties of the clutch to provide positive drive when needed and allow free rotation when wheels need to turn at different speeds.
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 solution ensures efficient power transmission and reduced wear by allowing differential rotation of wheels during turns, minimizing wheel slip and enhancing vehicle maneuverability and traction.
Implementation Method 1
At least one spring biases each roll against movement radially outward relative to the slot
Implementation Method 2
The bi-directional overrunning clutch assembly is configured, when engaged, to transmit torque between the pinion gear and the drive axle segments
Implementation Method 3
A ring gear is engaged to the pinion gear
Data Source
AI summary
A positive drive differential assembly including a differential with an input pinion configured to operably engage with a drive shaft so as to permit the drive shaft to rotate the pinion. A bi-directional overrunning clutch assembly is configured to transmit torque between the pinion and two drive axle segments. A pinion disconnect assembly is provided for controlling transmission of rotation to the pinion and including a rotary coupler. A linear actuator is connected to the rotary coupler and configured to translate the rotary coupler between connected and disconnected positions.