US 2026/0138437 A1Published application

Auxiliary driving apparatus of a 4wd hybrid electric vehicle

AssigneesHyundai Motor Company, Kia Corporation

InventorsSung Gon Byun, Kwang Min Choi, Chonok Kim, Baekyu Kim, Won Seok Lee, Junyoung Ha, Su Hyeon Maeng, Dong Hui Cheon, Jieun Kim, Yohan Kim, Jaehyuk Seo, Jongho Jung, Yunkyung Ji, Jongyun Park, Sun Sung Kwon

Life of this patent

Estimating the term…

patentgrep

Loading patent…

Abstract

An auxiliary driving apparatus of a 4WD hybrid electric vehicle is a series-type driving apparatus to which a longitudinal engine is applied, and a driving mechanism including an engine, a motor, and a plurality of clutches is applied to the front wheel side of a hybrid electric vehicle with a motor applied to the rear wheel side as a main driving source, so that the series mode can be implemented in the rear wheel 2WD mode, and the 4WD (AWD) EV mode can be driven when the engine is stopped.

Claims23

Dependent claims

An auxiliary driving apparatus for a front wheel side of a four-wheel drive (4WD) hybrid electric vehicle, the auxiliary driving apparatus comprising:

first and second idle shafts arranged in parallel to an engine output shaft, wherein the 4WD hybrid electric vehicle includes:
a first motor applied to a rear wheel side as a main driving source, and
an engine and an auxiliary motor positioned in a longitudinal direction and applied as an auxiliary driving source, wherein the auxiliary motor includes an auxiliary motor shaft formed as a hollow shaft and arranged to overlap the engine output shaft of the engine without rotation interference,
wherein a motor torque output from the auxiliary motor is reduced in rotation speed by an auxiliary reducer and the motor torque is transmitted to front wheels on two sides of the 4WD hybrid electric vehicle through an auxiliary differential while absorbing a difference in rotation speed;
and
an output shaft arranged parallel to the second idle shaft and having power connected to the auxiliary differential via a front wheel transfer,
wherein the auxiliary reducer includes:
a first speed reducing part configured to selectively reduce rotation speed of an engine torque of the engine to the auxiliary motor through the engine output shaft, the second idle shaft, and the auxiliary motor shaft, and
a second speed reducing part configured to selectively transmit the motor torque of the auxiliary motor to the front wheel transfer connected to a differential ring gear of the auxiliary differential through the auxiliary motor shaft, the second idle shaft, and the output shaft.

6 more elements

An auxiliary driving apparatus of a four-wheel drive (4WD) hybrid electric vehicle, of which a first motor applied to a rear wheel side is a main driving source, the auxiliary driving apparatus comprising:

an engine placed in longitudinal direction on a front wheel side;
an auxiliary motor which is arranged in a longitudinal direction on the front wheel side and has an auxiliary motor shaft formed as a hollow shaft and is arranged to overlap an engine output shaft of the engine without rotation interference;
first and second idle shafts arranged parallel to the engine output shaft;
an output shaft arranged parallel to the second idle shaft and having power connected to an auxiliary differential via a front wheel transfer;
a first input gear fixed to the engine output shaft;
a second input gear fixed to the auxiliary motor shaft;
a first idle gear rotatably positioned on the first idle shaft, selectively connected to the first idle shaft via a first clutch, and externally engaged with the first input gear;
a second idle gear fixed to the first idle shaft and externally engaged with the second input gear;
a third idle gear rotatably disposed on the second idle shaft and externally engaged with the second input gear;
a fourth idle gear fixed to the second idle shaft;
and
an output gear fixed to the output shaft and externally engaged with the fourth idle gear.

9 more elements

an engine placed in longitudinal direction on a front wheel side;
an auxiliary motor which is arranged in a longitudinal direction on the front wheel side and has an auxiliary motor shaft formed as a hollow shaft and is arranged to overlap an engine output shaft of the engine without rotation interference;
first, second idle shafts arranged parallel to the engine output shaft;
an output shaft arranged parallel to the second idle shaft and having power connected to an auxiliary differential via a front wheel transfer;
a first input gear fixed to the engine output shaft;
a second input gear fixed to the auxiliary motor shaft;
a first idle gear rotatably positioned on the first idle shaft, selectively connected to the idle first shaft via a first clutch, and externally engaged with the first input gear;
a second idle gear fixed to the first idle shaft and externally engaged with the second input gear;
a third idle gear fixed to the second idle shaft and externally engaged with the second input gear;
a fourth idle gear fixed to the second idle shaft;
and
an output gear rotatably disposed on the output shaft, selectively connected to the output shaft via a second clutch, and externally engaged with the fourth idle gear.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/390,155Filed 14 Nov 2025
Priority: KR 10-2024-016382118 Nov 2024
Published: 21 May 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification23 codes

B60K 6/52
Architecture of the driveline characterised by arrangement or kind of transmission units: driving a plurality of drive axles, e.g. four-wheel drive
B60K 6/24
Characterised by apparatus, components or means specially adapted for HEVs: characterised by the combustion engines
B60K 6/26
Characterised by apparatus, components or means specially adapted for HEVs: characterised by the motors or the generators
B60K 6/36
Characterised by apparatus, components or means specially adapted for HEVs: characterised by the transmission gearings