Variable Speed Motor Driven Differential Gear Control
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Solution Overview
Problem
Conventional differentials, including limited-slip differentials, face challenges in precisely controlling differential rotational rates between axle shafts, leading to potential slip and torque loss, increased complexity, and higher costs due to electronic controls.
Innovation Solution
A gearing assembly with a differential configuration that includes adjustment gears driven by a variable speed motor, utilizing planetary gears and a sun gear to control the relative rotation of axle shafts without relying on friction, allowing precise control of differential rotational rates based on steering angle and rotational velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional differentials are used, then the device is simple and inexpensive to manufacture, but the differential rotational rate cannot be precisely controlled leading to slip and torque loss
Solution Approach 1:
The patent replaces traditional friction-based mechanical limited-slip differential mechanisms with a mechanical system using planetary gears and a sun gear. This substitution eliminates reliance on friction while achieving precise control of differential rotational rates through gear engagement, thereby improving manufacturing precision without excessive complexity
Solution Approach 2:
The patent introduces a sun gear as an intermediary element that mediates between the drive shaft and the axle shafts. The sun gear works in conjunction with planetary gears to precisely control the differential rotational rate, enabling accurate power distribution to left and right wheels without the slip problems of conventional differentials
2Manufacturing precision
If electronic controls are added to differentials, then the differential rotational rate can be controlled, but the complexity and cost of manufacture increase
Solution Approach 1:
The patent substitutes electronic control systems with a purely mechanical control system using planetary gears and a sun gear. This mechanical approach achieves precise differential rotational rate control through gear ratios and mechanical engagement, eliminating the need for expensive electronic sensors, controllers, and actuators while maintaining manufacturing precision
Solution Approach 2:
The mechanical system is designed to be self-regulating through the inherent properties of planetary gear engagement. The differential rotational rate is automatically controlled by the mechanical interaction between gears without requiring external electronic sensing or control signals, thereby reducing complexity and manufacturing cost
3Reliability
If limited-slip differentials are used, then traction problems are limited, but torque is always lost to the slipping wheel and the device becomes more complex
Solution Approach 1:
The patent replaces friction-based torque limiting mechanisms with a mechanical gear system that positively engages axle shafts. The planetary gears and sun gear create a rigid mechanical connection that prevents wheel slip through gear teeth engagement rather than friction, thereby eliminating torque loss to slipping wheels while improving reliability
Solution Approach 2:
The patent employs planetary gears with curved tooth profiles that engage smoothly with the sun gear and each other. This curved gear geometry allows for precise control of power distribution while maintaining continuous positive engagement, preventing slip and torque loss without the need for friction-based limited-slip mechanisms
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 prevents significant slip and torque loss, reduces complexity and costs by eliminating friction-based components, and enhances vehicle safety and handling by maintaining precise differential rotational rates.
Implementation Method 1
The plurality of adjustment gears includes a subassembly of planetary gears including a planetary gear carrier, a first set of planetary gears coupled to the planetary gear carrier, and a second set of planetary gears coupled to the planetary gear carrier
Data Source
AI summary
Disclosed herein are systems, gearing assemblies, and methods for controlling a differential rotation rate between shafts of a vehicle using a variable speed motor. An embodiment includes a gearing assembly including a differential configured to engage a first axle shaft, a second axle shaft, and a drive shaft of a vehicle. The gearing assembly further includes a plurality of adjustment gears configured to engage the differential, configured to be driven by a variable speed motor of the vehicle, and configured to controllably alter a rotation of the first axle shaft relative to the second axle shaft based on rotation produced by the variable speed motor. The plurality of adjustment gears includes a subassembly of planetary gears including a planetary gear carrier, a first set of planetary gears coupled to the planetary gear carrier, and a second set of planetary gears coupled to the planetary gear carrier.