Double Clutch Assembly for Compact EV Speed Shifting and Torque Vectoring

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Solution Overview

Problem

Conventional electric driving apparatuses for vehicles are complex and bulky, making them difficult to manufacture and costly, particularly due to the use of complex components like planetary gears for speed reduction and torque vectoring functions.

Innovation Solution

A simplified electric driving apparatus design featuring a double clutch unit with a speed shifting unit that includes a housing, motor shaft, and a pair of output shafts, utilizing a double clutch assembly with clutch housings, clutch hubs, and clutch plate packages to achieve two-stage speed reduction and torque vectoring, while minimizing radial size and optimizing hydraulic pressure for stable operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If planetary gears are used for speed reduction and torque vectoring, then speed reduction function and torque vectoring function are achieved, but device size becomes large and structure becomes complicated

Engineering Contradiction:

Improvespeed reduction function and torque vectoring functionVSAvoidstructure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The transmission system is segmented into two independent clutch units (first clutch unit and second clutch unit), each handling one speed reduction stage. This segmentation allows each clutch to be simpler in structure while collectively achieving the complex two-stage speed reduction and torque vectoring functions that would otherwise require bulky planetary gears.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If planetary gears are used for speed reduction and torque vectoring, then speed reduction function and torque vectoring function are achieved, but manufacturing difficulty increases and cost increases

Engineering Contradiction:

Improvespeed reduction function and torque vectoring functionVSAvoidmanufacturing ease

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If conventional design is used, then speed reduction and torque vectoring are achieved, but radial size is large

Engineering Contradiction:

Improvespeed reduction and torque vectoring capabilityVSAvoidradial size

Core Design Contradiction:

Adaptability or versatilityVSArea of moving object

Solution Approach 1:

The patent transitions from a conventional single-plane gear arrangement to a multi-dimensional coaxial clutch arrangement. The first and second clutch units are arranged coaxially along the rotational axis, with clutch hubs and clutch plates stacked in the axial direction. This dimensional reorganization reduces radial footprint while maintaining the two-stage speed reduction and torque vectoring capabilities.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS12259011B2Double clutch assembly of electric driving apparatus for vehicle and electric driving apparatus including same

Publication Date: 2025.03.25 HANSAE MOBILITY CO LTD

AI summary

An electric driving apparatus includes: a housing; an electric machine; a speed shifting unit; and a double clutch unit. The double clutch unit includes: a clutch housing; a first clutch hub and a second clutch hub; a first clutch plate package; and a second clutch plate package. The speed shifting unit comprises a first output gear and a second output gear that can be independently rotationally driven by the motor shaft, and the clutch housing comprises a first gear and a second gear configured to be engaged with the first and second output gears to implement rotational driving force at different rotational speeds.