Differential Axle Speed Control via Electric Motor
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Solution Overview
Problem
Existing axle differentials, including electronic limited slip differentials, often allow significant slip under adverse traction conditions, compromising vehicle safety and efficiency due to mechanical complexity and high manufacturing costs.
Innovation Solution
A system that uses an electric motor mechanically coupled to an axle to adjust rotational speed via a differential gearing assembly, ensuring optimal speed matching between axles independent of traction conditions, eliminating slip through precise electronic control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic limited slip differentials are used to limit axle slip, then traction control is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces complex electronic control systems with a mechanically self-regulating differential design. The differential case directly drives the axle shafts through mechanical gearing, eliminating the need for electronic sensors, actuators, and control units while maintaining effective slip limitation through pure mechanical means.
Solution Approach 2:
The differential automatically regulates power distribution to axles through its mechanical design without external electronic intervention. The system self-adjusts torque distribution based on axle slip conditions through inherent mechanical characteristics, requiring no external power source or electronic control.
2Manufacturing precision
If electronic controls are added to differentials for precision speed control, then axle speed precision is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent achieves precise axle speed control through mechanical gearing ratios and direct mechanical coupling between the differential case and axle shafts. This mechanical approach provides inherent speed precision without requiring electronic control components, sensors, or complex manufacturing processes.
3Reliability
If limited slip differentials redirect torque to the axle with most traction, then traction is improved, but torque loss to slipping axle and mechanical complexity increase
Solution Approach 1:
The patent uses direct mechanical coupling where the differential case drives both axle shafts through symmetric gearing. This mechanical design minimizes torque loss by efficiently transferring power through rigid mechanical connections rather than relying on friction-based limited slip mechanisms or complex electronic torque vectoring systems.
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 effectively prevents slipping by dynamically adjusting axle speeds, enhancing vehicle safety and simplicity while reducing manufacturing costs by leveraging electronic controls for precise traction management.
Implementation Method 1
An electric motor is provided that is mechanically coupled to the first axle for selectively altering the rotational speed of the first axles
Implementation Method 2
The change in rotational speed imparted to the first axles is transferred to the second axles through the gearing of the differential
Data Source
AI summary
A system and method for selectively altering the rotational speed of one of the axles joined to a differential in order to keep that axle at optimal speed for a given set of conditions. In the system, a differential is attached to a driveshaft. A first axle is coupled to the differential, wherein the differential transfers rotational energy from the driveshaft to the first axle. This causes the first axle to rotate at a second rotational speed when the driveshaft turns at a first rotational speed. An electric motor is provided that is mechanically coupled to the first axle for selectively altering the second rotational speed. The electric motor is variable, therein enabling the second rotational speed to be altered as needed. Changes in the rotational speed of the first axle are imparted to a second axle through the gearing of the differential.