US-20260124899-A1 - HYBRID ELECTRIC SYSTEM FOR VEHICLE AND DRIVE MECHANISM AND RANGE EXTENDER THEREOF, AND VEHICLE

US20260124899A1US 20260124899 A1US20260124899 A1US 20260124899A1US-20260124899-A1

Abstract

A hybrid electric system for a vehicle and a drive mechanism and a range extender thereof, and a vehicle are disclosed. The mechanism includes: an internal combustion engine drive assembly drivingly connected to an internal combustion engine; a motor drive assembly drivingly connected to a motor; a wheel drive assembly including a planetary gear set, a differential and a synchronizer, the planetary gear set including a sun gear, a planetary carrier and a toothed ring, the sun gear being drivingly connected to the motor drive assembly, the planetary carrier being connected to a housing of the differential, and an output shaft of the differential being connected to wheels; and a clutch configured to drivingly connect or decouple the internal combustion engine drive assembly to or from the motor. The synchronizer can fix the toothed ring against rotation or fixedly connect the toothed ring to the planetary carrier.

Inventors

Qing Xu
Shaozhi Yuan
Lei Song

Assignees

ZF FRIEDRICHSHAFEN AG

Dates

Publication Date: 20260507
Application Date: 20251106
Priority Date: 20241106

Claims (12)

1 . A drive mechanism of a hybrid electric system for a vehicle, comprising: an internal combustion engine drive assembly configured to be drivingly connected to an internal combustion engine; a motor drive assembly configured to be drivingly connected to a motor; a wheel drive assembly configured to be drivingly connected to wheels; and a clutch disposed on the internal combustion engine drive assembly or the motor drive assembly and configured to drivingly connect or decouple the internal combustion engine drive assembly to or from the motor drive assembly, wherein the wheel drive assembly comprises a planetary gear set, a differential and a synchronizer, the planetary gear set comprising a sun gear, a planetary carrier and a toothed ring, the sun gear being drivingly connected to the motor drive assembly, the planetary carrier being connected to a housing of the differential, and an output shaft of the differential being connected to the wheels, wherein the planetary carrier outputs a first-gear rotational speed when the synchronizer fixes the toothed ring against rotation and the sun gear rotates, wherein the wheel drive assembly is decoupled from the wheels when the synchronizer does not fix any rotating element of the planetary gear set, and wherein the planetary carrier outputs a second-gear rotational speed when the synchronizer fixedly connects the toothed ring to the planetary carrier and the sun gear rotates.
2 . The drive mechanism according to claim 1 , further comprising: a fixed housing, wherein the synchronizer comprises an engagement sleeve, a first engagement ring gear and a second engagement ring gear, and the engagement sleeve is disposed on the toothed ring and movably connected to the toothed ring in an axial direction of the toothed ring, wherein the first engagement ring gear is disposed on the fixed housing, wherein the second engagement ring gear is disposed on the planetary carrier, whereni the engagement sleeve is engaged with and locked to the first engagement ring gear when the engagement sleeve is at a first axial position, wherein the engagement sleeve is neither engaged with the first engagement ring gear nor engaged with the second engagement ring gear when the engagement sleeve is at a second axial position, and wherein the engagement sleeve is engaged with and locked to the second engagement ring gear when the engagement sleeve is at a third axial position.
3 . The drive mechanism according to claim 2 , wherein the motor drive assembly comprises a first input shaft and a first output shaft, and the wheel drive assembly further comprises a first gear, a second input shaft and a second gear, and wherein the first gear is fixed to the first output shaft, the sun gear is fixed to a first end of the second input shaft, the second gear is fixed to a second end of the second input shaft, and the first gear and the second gear are meshingly connected.
4 . The drive mechanism according to claim 3 , wherein the first input shaft and the first output shaft are drivingly connected by a reduction gear set, and a planetary carrier of the reduction gear set is fixedly connected to the first output shaft.
5 . The drive mechanism according to claim 3 , wherein the internal combustion engine drive assembly comprises a second output shaft, and the clutch is disposed on the first output shaft or the second output shaft.
6 . The drive mechanism according to claim 2 , wherein the motor drive assembly comprises a first input shaft, a reduction gear set and a first output shaft, the first input shaft and the first output shaft being drivingly connected by the reduction gear set, a planetary carrier of the reduction gear set being fixedly connected to the fixed housing, and the first output shaft being fixedly connected to a toothed ring of the reduction gear set, wherein the wheel drive assembly further comprises a second input shaft and a second gear, and wherein the sun gear is fixed to a first end of the second input shaft, the second gear is fixed to a second end of the second input shaft, and the toothed ring of the reduction gear set is meshingly connected to the second gear.
7 . The drive mechanism according to claim 2 , further comprising: a driving mechanism that controls the engagement sleeve to move toward the first axial position, the second axial position or the third axial position.
8 . The drive mechanism according to claim 1 , wherein the internal combustion engine drive assembly comprises a torsional damper arranged between the internal combustion engine and the clutch.
9 . The drive mechanism according to claim 1 , wherein the planetary gear set, the differential and the synchronizer are coaxially arranged about an output shaft of the differential.
10 . A range extender of a hybrid electric system for a vehicle, comprising: the drive mechanism according to claim 1 ; and a motor drivingly connected to the motor drive assembly of the drive mechanism.
11 . A hybrid electric system for a vehicle, comprising: the range extender according to claim 10 ; and an internal combustion engine drivingly connected to an internal combustion engine drive assembly of a drive mechanism of the range extender, wherein the internal combustion engine drive assembly is drivingly connected to the motor drive assembly when the clutch is engaged, wherein the planetary carrier outputs a first-gear rotational speed when the synchronizer fixes the toothed ring against rotation and the sun gear rotates, wherein the wheel drive assembly is decoupled from the wheels when the synchronizer does not fix any rotating element of the planetary gear set, and wherein the planetary carrier outputs a second-gear rotational speed when the synchronizer fixedly connects the toothed ring to the planetary carrier and the sun gear rotates.
12 . A vehicle, comprising: the hybrid electric system of claim 11 .

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application Nos. 202411570927.9, filed on Nov. 6, 2024 and 202510975854.X, filed on Jul. 15, 2025, the entirety of both of which are hereby fully incorporated by reference herein. TECHNICAL FIELD The present disclosure relates to the technical field of automobiles, and in particular to a hybrid electric system for a vehicle and a drive mechanism and a range extender thereof, and a vehicle. BACKGROUND A power train of a pure electric vehicle is generally composed of three parts, namely, a driving motor, a controller, and a traction battery. Due to the limited power supply characteristics of the power train, pure electric vehicles usually face range anxiety when in use. To alleviate range anxiety, the automotive industry has introduced hybrid electric vehicles. A hybrid electric vehicle is a vehicle that is equipped with two power sources, namely a thermal power source (produced by a conventional gasoline or diesel engine) and an electric power source (a traction battery and a driving motor). For a parallel hybrid electric vehicle, both of an internal combustion engine and a motor can drive one or more driving wheels by a drive unit of the hybrid electric vehicle, so as to improve the vehicle's range. However, the current parallel hybrid electric vehicle has the problem of unsmooth switching of various operating modes, which affects the driving experience of users. SUMMARY Regarding the problems in the prior art, an objective of the present disclosure is to provide a hybrid electric system for a vehicle and a drive mechanism and a range extender thereof, and a vehicle, which meet various drive requirements and improve the driving experience of users. An embodiment of the present disclosure provides a drive mechanism of a hybrid electric system for a vehicle, including: an internal combustion engine drive assembly configured to be drivingly connected to an internal combustion engine;a motor drive assembly configured to be drivingly connected to a motor;a wheel drive assembly configured to be drivingly connected to wheels; anda clutch disposed on the internal combustion engine drive assembly or the motor drive assembly and configured to drivingly connect or decouple the internal combustion engine drive assembly to or from the motor drive assembly;where the wheel drive assembly includes a planetary gear set, a differential and a synchronizer, the planetary gear set including a sun gear, a planetary carrier and a toothed ring, the sun gear being drivingly connected to the motor drive assembly, the planetary carrier being connected to a housing of the differential, and an output shaft of the differential being connected to the wheels;the planetary carrier outputs a first-gear rotational speed when the synchronizer fixes the toothed ring against rotation and the sun gear rotates;the wheel drive assembly is decoupled from the wheels when the synchronizer does not fix any rotating element of the planetary gear set; andthe planetary carrier outputs a second-gear rotational speed when the synchronizer fixedly connects the toothed ring to the planetary carrier and the sun gear rotates. In some embodiments, the drive mechanism further includes a fixed housing, where the synchronizer includes an engagement sleeve, a first engagement ring gear and a second engagement ring gear, and the engagement sleeve is disposed on the toothed ring and movably connected to the toothed ring in an axial direction of the toothed ring; the first engagement ring gear is disposed on the fixed housing; the second engagement ring gear is disposed on the planetary carrier; the engagement sleeve is engaged with and locked to the first engagement ring gear when the engagement sleeve is at a first axial position;the engagement sleeve is neither engaged with the first engagement ring gear nor engaged with the second engagement ring gear when the engagement sleeve is at a second axial position; andthe engagement sleeve is engaged with and locked to the second engagement ring gear when the engagement sleeve is at a third axial position. In some embodiments, the motor drive assembly includes a first input shaft and a first output shaft, and the wheel drive assembly further includes a first gear, a second input shaft and a second gear; and the first gear is fixed to the first output shaft, the sun gear is fixed to a first end of the second input shaft, the second gear is fixed to a second end of the second input shaft, and the first gear and the second gear are meshingly connected. In some embodiments, the first input shaft and the first output shaft are drivingly connected by a reduction gear set, and a planetary carrier of the reduction gear set is fixedly connected to the first output shaft. In some embodiments, the motor drive assembly includes a first input shaft, a reduction gear set, a first output shaft and a fixed housing, the first input shaft and the fi