WO2022019843A1 - Drive with two electric motors and planetary gearbox - Google Patents

Drive with two electric motors and planetary gearbox Download PDF

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Publication number
WO2022019843A1
WO2022019843A1 PCT/SK2021/050008 SK2021050008W WO2022019843A1 WO 2022019843 A1 WO2022019843 A1 WO 2022019843A1 SK 2021050008 W SK2021050008 W SK 2021050008W WO 2022019843 A1 WO2022019843 A1 WO 2022019843A1
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WO
WIPO (PCT)
Prior art keywords
electric motor
rotor
drive
planetary gearbox
stator
Prior art date
Application number
PCT/SK2021/050008
Other languages
French (fr)
Inventor
Roman Procházka
Original Assignee
Prochazka Roman
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Prochazka Roman filed Critical Prochazka Roman
Publication of WO2022019843A1 publication Critical patent/WO2022019843A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/02—Arrangement or mounting of electrical propulsion units comprising more than one electric motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/06—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/06—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing
    • B60K17/08—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing of mechanical type

Definitions

  • the invention relates to a drive with two electric motors and a planetary gearbox for use mainly in electric vehicles.
  • the first gear has a high gear ratio. Only a small speed is achieved in the first gear and therefore other gears are engaged, which reduce the gear ratio and achieve higher speeds.
  • the current electric cars mostly use a constant gear from 3: 1 to 12: 1 depending on the purpose of the vehicle and the characteristics of the motor because the electric motor can develop high torque even at low speeds and also achieves high speeds to achieve high vehicle speeds.
  • the disadvantage of a constant gear is the low efficiency of the electric motor at low speeds, which can reduce its range by up to 50% in city traffic without recuperation. At high speeds, the electric motor loses torque, which results in low dynamics.
  • the present invention which consists of a drive with two electric motors and the planetary gearbox, comprising the first electric motor with stator and rotor and the second electric motor with stator and rotor, the stator of the first electric motor is firmly connected to the stator of the second electric motor, which are connected to the frame or body of the vehicle, the rotor of the first electric motor is connected via the output shaft to the central wheel of the planetary gear and the rotor of the second electric motor is connected to the ring gear equipped with the brake disc which is connected to the frame or body of the vehicle and the ring gear and the central wheel engage with satellites connected by the carrier which is connected to the output shaft.
  • FIG. 1 The figure schematically shows a drive consisting of two electric motors and a planetary gearbox.
  • the drive with two electric motors and the planetary gearbox comprises the first electric motor with stator 1 and rotor 2 and the second electric motor with stator 4 and rotor 5, the stator 1 of the first electric motor is firmly connected to the stator 4 of the second electric motor, which are connected to the frame of body 13 of the vehicle; wherein the rotor 2 of the first electric motor is connected via the output shaft 3 to the central wheel 9 of the planetary gearbox and the rotor 5 of the second electric motor is connected to the ring gear 6 equipped with the brake disc 10 of the brake 11 connected to the frame or body 13 of the vehicle, then the ring gear 6 and the central wheel 9 engage with the satellites 7 connected by the carrier 8 which is connected to the output shaft 12.
  • the brake 11 is activated, which firmly stops the ring gear 6 of the planetary gearbox and the rotor 5 of the second motor.
  • the drive works as the motor with the planetary gearbox with the fixed ring gear 6.
  • the gearbox has a higher gear ratio, e.g. 10: 1, which is a good setting for starting and driving at low speeds up to 60 km / h.
  • the drive thus easily exceeds the starting torque of the vehicle and the first electric motor works in a small range of output speeds of the drive, which increases its efficiency.
  • the vehicle has high dynamics during the start-up even with the electric motor of lower power, which reduces energy consumption.
  • the satellites 7 are leaned on the fixed ring gear 6 by force transferred from the central wheel 9. After overcoming the starting torque of the vehicle, the force transferred to the ring gear 6 is smaller and the satellites 7 rotating on carrier 8 carry the ring gear 6 in direction of rotation of satellite 8 carrier and thereby further reduce the force acting on the ring gear 6.
  • the drive mode is changed so that the first electric motor is active and reached its maximum effective speed and started the vehicle, then the brake 11 is released and thus the rotor 5 of motor 2 connected with the ring gear 6 of the gearbox and the second electric motor is activated in direction of rotation of the output shaft 12 of the drive.
  • Increasing the speed of the rotor 5 of the second electric motor and the associated ring gear 6 of the gearbox will reduce the gear ratio of the planetary gearbox and thus increase the speed of the output shaft 12.
  • the electric motors of drive operate in a more optimal range of their efficiency at low and high output speeds of drive.
  • the gear ratio of the gearbox is 10: 1. If the ring gear 6 has the same speed as the output shaft 12, the gear ratio is 1: 1. If the ring gear 6 has half of the speed of the output shaft 12, the gear ratio is 5: 1.
  • the 10: 1 gear ratio of the planetary gearbox is not fixed and is used as an example for a better explanation.
  • the drive during the start-up mode has a higher gear ratio than conventional electric drives, so it can recover electrical energy to lower vehicle speeds, which brings more electrical energy returned to the battery.
  • Gear ratio of input and output shaft of planetary gearbox 10 1 Gear ratio of ring gear and output shaft of planetary gearbox 1.1: 1
  • the torque of the first electric motor is 20 Nm
  • the torque of the second electric motor is 20 Nm Vehicle wheel diameter 2m

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Structure Of Transmissions (AREA)

Abstract

The drive with two electric motors and the planetary gearbox comprises the first electric motor with stator (1) and rotor (2) and the second electric motor with stator (4) and rotor (5), the stator (1) of the first electric motor is firmly connected to the stator (4) of the second electric motor, which is connected to the frame or body (13) of the vehicle, the rotor (2) of the first electric motor is connected via the output shaft (3) to the central wheel (9) of the planetary gearbox and the rotor (5) of the second electric motor is connected with the ring gear ( 6), which is equipped with the brake disc (10) of the brake (11), which is connected to the frame or body (13) of the vehicle, then the ring gear (6) and the central wheel (9) engage with the satellites (7) connected by the carrier (8). ), which is connected to the output shaft (12).

Description

DRIVE WITH TWO ELECTRIC MOTORS AND PLANETARY GEARBOX
Technical field
The invention relates to a drive with two electric motors and a planetary gearbox for use mainly in electric vehicles.
Background of the invention
In the present, high starting torque is required in every vehicle. In a conventional vehicle, the first gear has a high gear ratio. Only a small speed is achieved in the first gear and therefore other gears are engaged, which reduce the gear ratio and achieve higher speeds.
The current electric cars mostly use a constant gear from 3: 1 to 12: 1 depending on the purpose of the vehicle and the characteristics of the motor because the electric motor can develop high torque even at low speeds and also achieves high speeds to achieve high vehicle speeds. The disadvantage of a constant gear is the low efficiency of the electric motor at low speeds, which can reduce its range by up to 50% in city traffic without recuperation. At high speeds, the electric motor loses torque, which results in low dynamics.
Subject of the invention
The introduced deficiencies are eliminated in the present invention, which consists of a drive with two electric motors and the planetary gearbox, comprising the first electric motor with stator and rotor and the second electric motor with stator and rotor, the stator of the first electric motor is firmly connected to the stator of the second electric motor, which are connected to the frame or body of the vehicle, the rotor of the first electric motor is connected via the output shaft to the central wheel of the planetary gear and the rotor of the second electric motor is connected to the ring gear equipped with the brake disc which is connected to the frame or body of the vehicle and the ring gear and the central wheel engage with satellites connected by the carrier which is connected to the output shaft.
Overview of figures in the drawing The figure schematically shows a drive consisting of two electric motors and a planetary gearbox.
Examples of the embodiment
The drive with two electric motors and the planetary gearbox comprises the first electric motor with stator 1 and rotor 2 and the second electric motor with stator 4 and rotor 5, the stator 1 of the first electric motor is firmly connected to the stator 4 of the second electric motor, which are connected to the frame of body 13 of the vehicle; wherein the rotor 2 of the first electric motor is connected via the output shaft 3 to the central wheel 9 of the planetary gearbox and the rotor 5 of the second electric motor is connected to the ring gear 6 equipped with the brake disc 10 of the brake 11 connected to the frame or body 13 of the vehicle, then the ring gear 6 and the central wheel 9 engage with the satellites 7 connected by the carrier 8 which is connected to the output shaft 12.
During the start-up, the brake 11 is activated, which firmly stops the ring gear 6 of the planetary gearbox and the rotor 5 of the second motor. In this way, the drive works as the motor with the planetary gearbox with the fixed ring gear 6. The gearbox has a higher gear ratio, e.g. 10: 1, which is a good setting for starting and driving at low speeds up to 60 km / h. The drive thus easily exceeds the starting torque of the vehicle and the first electric motor works in a small range of output speeds of the drive, which increases its efficiency. With such a high gear ratio of the gearbox, the vehicle has high dynamics during the start-up even with the electric motor of lower power, which reduces energy consumption.
In the start-up mode the satellites 7 are leaned on the fixed ring gear 6 by force transferred from the central wheel 9. After overcoming the starting torque of the vehicle, the force transferred to the ring gear 6 is smaller and the satellites 7 rotating on carrier 8 carry the ring gear 6 in direction of rotation of satellite 8 carrier and thereby further reduce the force acting on the ring gear 6.
To achieve a higher speed, the drive mode is changed so that the first electric motor is active and reached its maximum effective speed and started the vehicle, then the brake 11 is released and thus the rotor 5 of motor 2 connected with the ring gear 6 of the gearbox and the second electric motor is activated in direction of rotation of the output shaft 12 of the drive. Increasing the speed of the rotor 5 of the second electric motor and the associated ring gear 6 of the gearbox will reduce the gear ratio of the planetary gearbox and thus increase the speed of the output shaft 12. Thus, the electric motors of drive operate in a more optimal range of their efficiency at low and high output speeds of drive.
If the ring gear 6 of the planetary gearbox is fixed, the gear ratio of the gearbox is 10: 1. If the ring gear 6 has the same speed as the output shaft 12, the gear ratio is 1: 1. If the ring gear 6 has half of the speed of the output shaft 12, the gear ratio is 5: 1. The 10: 1 gear ratio of the planetary gearbox is not fixed and is used as an example for a better explanation.
Recuperation: When recuperating at higher speeds, both electric motors of the drive recover electrical energy.
In city traffic, it is necessary to recover electricity while achieving the lowest possible vehicle speeds. The drive during the start-up mode has a higher gear ratio than conventional electric drives, so it can recover electrical energy to lower vehicle speeds, which brings more electrical energy returned to the battery.
Start-up and achieving the maximum speed are shown in Table 1. Values for the given example:
Gear ratio of input and output shaft of planetary gearbox 10: 1 Gear ratio of ring gear and output shaft of planetary gearbox 1.1: 1 The torque of the first electric motor is 20 Nm The torque of the second electric motor is 20 Nm Vehicle wheel diameter 2m
Figure imgf000006_0001
Tab.l
Motor 1, 2, Otacky (1/min.) - Motor 1, 2, Speed (1/min.), Brzda, aktivna ano/nie - Brake, active yes/no), Planetova prevodovka, prevodovy pomer - Planetary gearbox, gear ratio, Vystupny hriadel’ pohonu, Otacky (1/min.) - Drive output shaft, Speed (1/min.), Rychlosf vozidla, (km h) - Vehicle speed, (km h), Krutiaci moment motora (1, 2), na vystupe (Nm) - Motor torque (1, 2), on the output (Nm), Ano - Yes, Nie - No, Tab. 1
- Table 1 By changing the speed ratio of the first motor and the second motor, it is possible to change the gear ratio of the planetary gearbox at the same vehicle speed, see Tab. 2, and thus also change the torque on the output shaft 12 of the drive. In this way, it is possible to set both electric motors to work at the optimum speed of their efficiency for a given vehicle speed, both for driving at a steady speed and for maximum dynamics at low and higher speeds.
Figure imgf000007_0001
Tab.2
Motor 1, 2, Otacky (1/min.) - Motor 1, 2, Speed (1/min.), Brzda, aktivna ano/nie - Brake, active yes/no), Planetova prevodovka, prevodovy pomer - Planetary gearbox, gear ratio, Vystupny hriadel’ pohonu, Otacky (1/min.) - Drive output shaft, Speed (1/min.), Rychlost’ vozidla, (km h) - Vehicle speed, (km h), Krutiaci moment motora (1, 2), na vystupe (Nm) - Motor torque (1, 2), on the output (Nm), Ano - Yes, Nie - No, Tab. 2
- Table 2

Claims

PATENT CLAIMS
A drive with two electric motors and a planetary gearbox, characterized in that it comprises the first electric motor with stator (1) and rotor (2) and the second electric motor with stator (4) and rotor (5), the stator (1) of the first electric motor is firmly connected with the stator (4) of the second electric motor, which is connected to the frame or body (13) of the vehicle, the rotor (2) of the first electric motor is connected via the output shaft (3) to the central wheel (9) of the planetary gearbox and the rotor (5) of the second electric motor is connected to the ring gear (6) which is equipped with the brake disc (10) of the brake (11) which is connected to the frame or body (13) of the vehicle, then the ring gear (6) and the central wheel (9) engage with satellites ( 7) connected by the carrier (8) which is connected with the output shaft (12).
PCT/SK2021/050008 2020-07-20 2021-06-24 Drive with two electric motors and planetary gearbox WO2022019843A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SK500442020A SK500442020A3 (en) 2020-07-20 2020-07-20 Propulsion with two electric motors and a planetary gearbox
SKPP50044-2020 2020-07-20

Publications (1)

Publication Number Publication Date
WO2022019843A1 true WO2022019843A1 (en) 2022-01-27

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PCT/SK2021/050008 WO2022019843A1 (en) 2020-07-20 2021-06-24 Drive with two electric motors and planetary gearbox

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WO (1) WO2022019843A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010109162A2 (en) * 2009-03-24 2010-09-30 Nexxtdrive Limited Transmission systems
CN203225641U (en) * 2013-05-14 2013-10-02 上海中科深江电动车辆有限公司 Birotor-motor planetary-gear stepless-speed-change electric drive control system used for electric automobile
JP2019037044A (en) * 2017-08-10 2019-03-07 本田技研工業株式会社 Driving device of vehicle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010109162A2 (en) * 2009-03-24 2010-09-30 Nexxtdrive Limited Transmission systems
CN203225641U (en) * 2013-05-14 2013-10-02 上海中科深江电动车辆有限公司 Birotor-motor planetary-gear stepless-speed-change electric drive control system used for electric automobile
JP2019037044A (en) * 2017-08-10 2019-03-07 本田技研工業株式会社 Driving device of vehicle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MOREIRA JARINA COSTA, MOREIRA JARINA, SANTA ROZINEIDE APARECIDA ANTUNES BOCA, NONES JANAÍNA, RIELLA HUMBERTO: "SYNTHESIS OF ZEOLITE 4A FOR OBTAINING ZEOLITE 5A BY IONIC EXCHANGE FOR FULL UTILIZATION OF WASTE FROM PAPER INDUSTRY", BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING, BRAZILAIN SOCIETY OF CHEMICAL ENGINEERING, SAO PAULO, BR, vol. 35, no. 2, 1 June 2018 (2018-06-01), BR , pages 623 - 630, XP055901235, ISSN: 0104-6632, DOI: 10.1590/0104-6632.20180352s20160395 *

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