Disconnecting Differential With One-Way Clutch Coasting Release
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Solution Overview
Problem
Existing disconnecting differentials fail to selectively interrupt power transmission in reverse power transmission states like coasting and suffer from Noise, Vibration, Harshness (NVH) issues during engagement, while maintaining speed differential and forward/reverse power transmission functions.
Innovation Solution
A disconnecting differential with a first and second one-way clutch, where the clutches are configured to lock or slip based on rotation conditions, and an interruption device using a push-pull body, pins, and elastic member to shift rolling elements, allowing power interruption without noise, and an electromagnetic coil for controlled operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a tooth-interlocking type disconnecting differential is used to reduce friction loss, then friction loss is reduced, but NVH (noise, vibration, harshness) increases due to impact during engagement and tooth wear
Solution Approach 1:
The patent replaces the traditional tooth-interlocking mechanical engagement system with an electromagnetic control system. The electromagnetic coil generates magnetic fields that act on the armature, enabling smooth engagement and disengagement of the one-way clutch without mechanical tooth impact. This substitution eliminates the source of NVH while maintaining the friction loss reduction benefit.
Solution Approach 2:
The patent introduces an electromagnetic coil and armature as intermediary components between the control system and the one-way clutch. These intermediaries enable controlled engagement and disengagement of the clutch, preventing direct mechanical impact between engagement teeth. The magnetic field acts as a mediator that smoothly transitions the clutch between locked and unlocked states, eliminating impact noise and vibration.
2Loss of energy
If a disconnecting differential is added to interrupt power transmission during coasting, then energy efficiency improves, but device complexity increases
Solution Approach 1:
The patent integrates multiple functions into a single compact assembly. The electromagnetic coil serves both as a control actuator for the one-way clutch and as part of the overall power transmission control system. The disconnecting differential mechanism simultaneously handles both forward and reverse power transmission interruption, eliminating the need for separate control mechanisms and reducing overall device complexity.
Solution Approach 2:
The patent combines the electromagnetic control system, one-way clutch, and differential mechanism into a single integrated disconnecting differential assembly. The electromagnetic coil, armature, and clutch components are merged into a compact structure that occupies minimal space while providing complete power interruption functionality for both driving and coasting conditions.
3Reliability
If engagement teeth are used to realize power transmission and interruption, then power interruption function is achieved, but wear increases and NVH occurs during engagement
Solution Approach 1:
The patent replaces the tooth-interlocking mechanical engagement system with an electromagnetic control system. The electromagnetic coil generates magnetic fields that act on the armature, enabling smooth engagement and disengagement of the one-way clutch without mechanical tooth impact. This substitution eliminates the source of NVH while maintaining the friction loss reduction benefit.
Solution Approach 2:
The patent introduces an electromagnetic coil and armature as intermediary components between the control system and the one-way clutch. These intermediaries enable controlled engagement and disengagement of the clutch, preventing direct mechanical impact between engagement teeth. The magnetic field acts as a mediator that smoothly transitions the clutch between locked and unlocked states, eliminating impact noise and vibration.
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 selective power interruption during coasting, reduces NVH, and improves energy efficiency by avoiding counter electromotive force resistance torque, thus enhancing vehicle range and reducing wear and noise.
Implementation Method 1
an electromagnetic coil configured to generate an electromagnetic force to drive the push-pull body to move in the first direction along the rotation direction of the differential housing
Data Source
AI summary
An electric drive transmission system includes a disconnecting differential. The disconnecting differential comprises a first one-way clutch, a second one-way clutch and an interruption device. The first one-way clutch and the second one-way clutch have opposite locking directions and are coaxially sleeved between a planet carrier and a differential housing. The interruption device comprises a power section and an interruption section, wherein the power section is located on an inner wall of a reduction gearbox, and wherein the interruption section is located on the differential housing and can shift, under the action of the power section, all rolling elements of the one-way clutch locked in a forward rotation coasting condition, thereby realizing selective releasing of the locking function of the one-way clutch.