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WO2020125586A1 - Ensemble moteur de moyeu et bicyclette électrique comprenant l'ensemble moteur de moyeu - Google Patents

Ensemble moteur de moyeu et bicyclette électrique comprenant l'ensemble moteur de moyeu Download PDF

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Publication number
WO2020125586A1
WO2020125586A1 PCT/CN2019/125695 CN2019125695W WO2020125586A1 WO 2020125586 A1 WO2020125586 A1 WO 2020125586A1 CN 2019125695 W CN2019125695 W CN 2019125695W WO 2020125586 A1 WO2020125586 A1 WO 2020125586A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor assembly
planetary gear
stator
motor
assembly according
Prior art date
Application number
PCT/CN2019/125695
Other languages
English (en)
Chinese (zh)
Inventor
华跃飞
吕志安
张尊睦
夏盛
Original Assignee
宁波麦思动力系统有限公司
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
Priority claimed from CN201811545108.3A external-priority patent/CN111327152A/zh
Priority claimed from CN201822116831.1U external-priority patent/CN209283016U/zh
Application filed by 宁波麦思动力系统有限公司 filed Critical 宁波麦思动力系统有限公司
Publication of WO2020125586A1 publication Critical patent/WO2020125586A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters

Definitions

  • the present application relates to an electric bicycle, in particular to a hub motor assembly of an electric bicycle and an electric bicycle including such a hub motor assembly.
  • Automobiles, motorcycles and fuel-powered mopeds are one of the main sources of urban air pollution and noise pollution, and their energy sources are mainly limited to petroleum.
  • electric vehicles do not have these disadvantages, so they are bound to be more and more widely used.
  • China is a "bike country”.
  • electric bicycles With the improvement of people's living standards, but also limited to residents' purchasing power and urban road facilities and other factors, electric bicycles will be a more competitive and more popular "green" mobility tool than electric vehicles.
  • the motor of the electric bicycle hub motor assembly is mainly divided into two categories: one is the permanent magnet brushed DC motor; the other One is a permanent magnet brushless DC motor.
  • the drive of the brushed DC motor is mechanically commutated by the brush and the commutator. Its internal structure is composed of the stator poles, rotor, brush, etc. It has the characteristics of simple structure and low manufacturing cost; while the brushless DC motor
  • the drive uses semiconductor switching devices (such as Hall elements) to achieve electronic commutation. It consists of permanent magnet rotors, multi-pole winding stators, position sensors, etc. It has high reliability, low energy consumption, no commutation sparks, and low mechanical noise. Etc.
  • the magnetic circuit of the hub motor assembly generally adopts surface-mount magnetic circuit design, the output torque is small and the temperature rise of the motor coil is higher.
  • the gears of the existing hub motor assembly mostly adopt the injection molding process with glass fiber nylon. Due to the hard material of the glass fiber and the low precision of the injection gear, the motor will be noisy; or the use of multiple teeth or large Modular gear design will increase the volume and weight of the motor.
  • An object of the present invention is to provide an in-wheel motor assembly that has a smaller sliding resistance, a longer sliding distance, and a better riding feeling when the power is turned off and the bicycle is allowed to slide.
  • Another object of the present invention is to provide a hub motor assembly that can increase the output torque while making the hub motor assembly radial structure more compact.
  • Another object of the present invention is to provide a hub motor assembly whose gear parts have low running noise and strong corrosion resistance.
  • the invention provides a hub motor assembly, including:
  • a driving mechanism provided in the outer housing the driving mechanism being an inner rotor motor and including a central shaft, a motor rotor and a motor stator, the motor rotor is fixedly mounted on the central shaft, the motor stator surrounds the motor Rotor setting;
  • a planetary gear reduction mechanism provided in the outer housing, the drive mechanism is connected to the planetary gear reduction mechanism, the planetary gear reduction mechanism includes a planet carrier, a sun gear connected to the central shaft, and is rotatably supported on the planet carrier And at least three sets of double planetary gears meshing with the sun gear, and an internal ring gear meshing with the double planetary gears;
  • a stator seat with which the first half shaft cooperates, the central shaft is rotatably supported on the stator seat at one end, and rotatably supported on the planet carrier at the other end;
  • a planetary gear support frame connected to the planetary gear reduction mechanism, and the second half shaft is mounted on the planetary gear support frame;
  • the outer housing further includes an end cover fixedly connected to the hub housing, the end cover is rotatably supported on the second half shaft through a shaft end bearing, and the inner ring gear passes A one-way bearing is connected to the end cover.
  • stator seat is connected to the hub shell of the outer shell through a bearing.
  • magnetic steel is evenly arranged in the rotor of the motor, and the magnetic steel extends along the radial direction.
  • the motor stator is provided between the stator seat and the planetary carrier; the end of the motor rotor near the stator seat is provided with a first bearing, and the end of the motor rotor near the planetary carrier is provided with a second bearing; A first groove is defined inside the open end of the stator seat, a second groove is defined inside the open end of the planet carrier near the stator seat, and the motor stator is disposed between the first groove and the second groove .
  • a plurality of openings are provided on a side of the stator seat opposite to the driving mechanism, and the openings are used for airflow circulation.
  • the motor rotor is interference-connected, keyed or punched with the central shaft.
  • an insulating skeleton is further provided on the stator of the motor, and the insulating skeleton is used to support the stator winding.
  • the first semi-axis, the central axis and the second semi-axis are arranged coaxially.
  • the double planetary gear includes a large planetary gear and a small planetary gear, and the large planetary gear and the small planetary gear are interference fit or integrally formed.
  • the material of the double planetary gear is plastic or nylon to reduce transmission noise.
  • the use of plastic or nylon gears can reduce the overall weight of the motor, and has better compatibility, durability and wear resistance.
  • end cover is a second end cover
  • the outer housing includes a first end cover, the hub housing, and the second end cover
  • the first end cover is provided at one end of the hub shell, and the second end cover is provided at the other end of the hub shell; the first end cover is sleeved on the first half shaft, the The second end cover is sleeved on the second half shaft, so that the outer casing forms a closed space, and the driving mechanism and the planetary gear reduction mechanism are both located in the space.
  • stator base and the first end cover are provided with outlet holes, and the outlet holes are used to lead out power cables and signal cables of the stator winding of the motor.
  • a circular groove is also provided on the second half shaft, and the circular groove is used for installing an O-ring, and the O-ring is disposed between the shaft end bearing and the second shaft.
  • multiple sets of heat dissipation grooves are evenly arranged on the outer sides of the stator seat and the planet carrier, and a plurality of heat dissipation ribs are evenly arranged on the side of the hub shell close to the stator seat.
  • the invention also provides an electric bicycle, including a wheel, a plurality of spokes and the hub motor assembly, the spokes are symmetrical about the vertical plane where the center point of the central axis is located, and are symmetrically arranged on the hub motor assembly Into the sides.
  • the products designed by the hub driving mechanism of the present invention are not only used in electric vehicles, but also can be electric booster bicycles or self-balancing vehicles. They are all protected by the present invention. range.
  • the present invention provides a compact hub motor assembly.
  • the hub motor assembly When the hub motor assembly is energized, the central shaft rotates, and the sun gear integrally formed with the central shaft rotates at the same time, driving multiple sets of dual planetary gears meshed with the sun gear to rotate.
  • the double planetary gear meshes with the inner ring gear and decelerates through the double planetary gear and the inner ring gear; the outer ring of the one-way bearing is connected to the inner ring gear, the inner ring of the one-way bearing is connected to the second end cover, and the second end cover It is fixedly connected with the hub shell, and the double planetary gear drives the inner ring gear to rotate.
  • the inner ring gear drives the second end cover and the hub shell to rotate through a one-way bearing.
  • the hub shell and the wheel are connected by spokes, and finally drive the wheel forward.
  • the magnetic steel is radially arranged in the rotor of the motor, and the stator of the motor is arranged in the groove formed by the stator seat and the planet carrier, which can make the radial structure of the motor more compact while increasing the output torque of the motor.
  • the gear parts of the invention are made of plastic or nylon bar material, which effectively reduces the running noise and can be operated without lubrication.
  • FIG. 1 schematically shows a hub motor assembly according to the present invention in a longitudinal cross-sectional view
  • FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. 1, schematically showing the arrangement of magnetic steel in the rotor;
  • Figure 3 schematically shows the stator base of the in-wheel motor assembly according to the invention in a perspective view
  • FIG. 4 schematically shows the planet carrier of the in-wheel motor assembly according to the present invention in a perspective view.
  • the reference signs are: 1- first half shaft, 2- center shaft, 3- drive mechanism, 4- second half shaft, 5- planetary gear reduction mechanism, 6-outer housing, 7- stator seat, 8 -Planet carrier, 9-Planet wheel support, 10-One-way bearing, 11-First boss, 12-Another bearing, 21-First shaft section, 22-First bearing, 23-Second shaft section, 24-second bearing, 31-motor stator, 32-motor rotor, 33-magnet, 34-insulated skeleton, 41-second boss, 42-circular groove, 43-shaft end bearing, 51-sun gear, 52-duplex planetary gear, 52a-large planetary gear, 52b-small planetary gear, 53-ring gear, 54-pin, 61-hub housing, 62 first end cap, 63-second end cap, 71 -First groove, 72-opening, 73-outlet hole, 81-second groove.
  • the "one embodiment” or “embodiment” referred to herein refers to a specific feature, structure, or characteristic that can be included in at least one implementation of the present invention.
  • the terms “upper”, “top”, “bottom”, etc. indicate the orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing this The invention and the simplified description do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the present invention.
  • first and second are used for description purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.
  • the features defined as “first” and “second” may explicitly or implicitly include one or more of the features.
  • the terms “first”, “second”, etc. are used to distinguish similar objects, and need not be used to describe a particular order or sequence. It should be understood that the data so used can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.
  • the present invention provides a compact in-wheel motor assembly, including a first half shaft 1, a central shaft 2 and a second half shaft 4, which are arranged coaxially, and are disposed in the outer housing 6
  • Drive mechanism 3 and planetary gear reduction mechanism 5 the drive mechanism 3 is connected to the planetary gear reduction mechanism 5,
  • the drive mechanism 3 includes a motor rotor 32 and a motor stator 31, the drive mechanism 3 is an inner rotor motor, the The motor rotor 32 and the motor stator 31 are sequentially sleeved on the central shaft 2.
  • the motor rotor 32 is connected to the central shaft 2.
  • a magnetic steel 33 is evenly arranged in the motor rotor 32, and the magnetic steel 33 extends in the radial direction ,
  • the motor stator 31 is provided between the stator seat 7 and the planet carrier 8; the end of the motor rotor 32 near the stator seat 7 is provided with a first bearing 22, and the end of the motor rotor 32 near the planet carrier 8 is provided with a first Second bearing 24.
  • a first groove 71 is provided inside the open end of the stator seat 7, a second groove 81 is provided inside the open end of the planet carrier 8 near the stator seat 7, and the motor stator 31 is provided in the first recess Between the slot 71 and the second groove 81; the side of the stator seat 7 opposite to the driving mechanism is provided with a plurality of openings 72, which are used for air flow.
  • the motor rotor 32 may be interference-connected, keyed, or punched with the central shaft 2.
  • the motor stator 31 may further be provided with an insulating frame 34, and the insulating frame 34 is used to support the stator winding.
  • the first shaft section 21 of the central shaft 2 is provided with a first bearing 22, the second shaft section 23 of the central shaft 2 is provided with a second bearing 24, and the diameter of the second shaft section 23 is larger than the first Shaft section 21, an end of the central shaft 2 close to the second shaft section 23 is provided with a sun gear 51, the sun gear 51 is integrally formed with the central shaft 2, and shaft sections of different diameters are designed to reduce the size of the sun gear Ensure the strength of the shaft core.
  • the central shaft 2 is connected to a planetary gear reduction mechanism 5 through a sun gear 51.
  • the planetary gear reduction mechanism 5 includes a sun gear 51, an internal ring gear 53, and at least three sets of double links supported on a planet carrier 8 through a pin 54 Planetary gear 52.
  • the double planetary gear 52 meshes with the sun gear 51 and the ring gear 53 respectively.
  • the ring gear 53 is connected to the second end cover 63 via the one-way bearing 10.
  • the planet carrier 8 is provided with a boss 82 that cooperates with a plurality of pin shafts 54 that have an interference fit with their corresponding bosses 82.
  • the pin shaft 54 is designed with a plurality of ring grooves, in which the pin shaft 54 The ring grooves at the two ends of the are equipped with O-rings respectively, and the middle ring groove is used to contain grease; when the double planetary gear 52 rotates around the pin shaft 54, the O-ring has a buffering effect, which can effectively absorb the manufacturing or The meshing impact caused by assembly errors reduces vibration and noise.
  • the O-rings mounted on the two ends of the pin 54 can effectively prevent the grease of the inner hole of the double planetary gear 52 from being exposed, which helps reduce the inner hole of the double planetary gear 52 and the pin 54 during operation
  • the friction of the machine improves the efficiency of the whole machine; the ring groove in the middle section can not only hold the grease, but also reduce the friction surface of the inner hole of the double planetary gear 52 and the pin shaft, which helps reduce the double planetary gear 52 during operation
  • the friction between the inner hole and the pin 54 improves the overall efficiency.
  • the double planetary gear 52 includes a large planetary gear 52a and a small planetary gear 52b.
  • the large planetary gear and the small planetary gear are interference fit or integrally formed.
  • the material of the double planetary gear 52 is plastic or nylon, which is used to reduce transmission noise. The use of plastic gears or nylon gears can reduce operating noise, reduce the overall weight of the motor, and have better compatibility, durability and wear resistance.
  • the planetary gear reduction mechanism 5 is connected to the planetary gear support frame 9 via a pin 54.
  • the planetary gear support frame 9 is in interference fit with the second half shaft 4.
  • the second half shaft 4 is provided with a thread at one end and the other end
  • a second boss 41 is provided for mounting and positioning the second half shaft 4 and the planetary gear support 9.
  • a circular groove 42 is also provided on the second half shaft, and the circular groove 42 is used to install an O-ring seal, and the O-ring seal is disposed between the shaft end bearing 43 and the second half shaft 4.
  • the outer housing 6 includes a first end cover 62, a hub housing 61, and a second end cover 63; the first end cover 62 is provided at one end of the hub housing 61, and the second end cover 63 is provided At the other end of the hub shell 61; the first end cover 62 is sleeved on the first half shaft 1, the first end cover 62 and the stator seat 7 are connected by bolts, and the second end cover 63 is sleeved on the second half shaft 4 and is preferably supported on the second half shaft 4 through a shaft end bearing 43.
  • the first end cover and the second end cover are respectively connected to the first
  • the outer sides of the half shaft and the second half shaft are provided with fastening nuts, so that the outer housing 6 constitutes a substantially closed space, and the drive mechanism 2 and the planetary gear reduction mechanism 5 are located in the space.
  • the stator base 21 is connected to the hub housing 61 via another bearing 12.
  • the stator base 7 is provided with a wire outlet hole 73.
  • a corresponding hole should also be formed in the first end cover 62 to lead out the power cable and signal cable of the motor stator winding.
  • a plurality of sets of heat dissipation grooves are evenly arranged on the outer sides of the stator seat 7 and the planet carrier 8, and a plurality of heat dissipation ribs are evenly arranged on the side of the hub shell 61 close to the stator seat 7 for increasing the heat dissipation area.
  • the heat dissipation ribs can also drive the air flow in the enclosed space, speed up the heat dissipation, improve the heat dissipation effect, reduce the damage caused by the heat to the internal parts of the hub motor assembly, and increase the service life of the hub motor assembly.
  • An embodiment of the present invention also provides an electric bicycle, including a wheel, a plurality of spokes, and the hub motor assembly, the spokes are symmetrically disposed on the hub with a vertical plane where the center point of the central axis is located as a plane of symmetry Both sides of the motor assembly.
  • the in-wheel motor assembly of the present invention is not only used in electric vehicles, but also used in electric power-assisted bicycles or self-balancing vehicles.
  • the working principle of the hub motor assembly when the hub motor assembly is energized, the central shaft 2 will rotate, driving the sun gear 51 integrally formed with the central shaft 2 to rotate at the same time, and thus driving multiple sets of double planetary gears meshing with the sun gear 51
  • the double planetary gear 52 meshes with the ring gear 53 and decelerates through the double planetary gear 52 and the ring gear 53
  • the outer ring of the one-way bearing 10 is connected to the ring gear 53 and the inner ring of the one-way bearing 10
  • the second end cover 63 is fixedly connected with the hub shell 61
  • the double planetary gear 52 drives the ring gear 53 to rotate
  • the ring gear 53 drives the second end cover 63 and the hub through the one-way bearing 10
  • the housing 61 rotates, the hub housing 61 and the wheel are connected by spokes, and finally the wheel is driven forward.
  • the magnetic steel is radially arranged in the rotor of the motor, and the stator of the motor is arranged in a groove formed by the stator seat and the planet carrier, which can make the motor more compact in the radial direction while increasing the output torque of the motor.
  • the gear part of the invention is made of nylon bar material, which effectively reduces the operation noise and can be operated without lubrication.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

La présente invention concerne un ensemble moteur de moyeu, comprenant : un mécanisme d'entraînement (3) disposé dans un boîtier externe; un mécanisme de réduction de vitesse à engrenage planétaire (5) disposé dans le boîtier externe et relié au mécanisme d'entraînement; une base de stator (7) avec laquelle s'ajuste un premier demi-arbre (1); et un cadre de support d'engrenage planétaire (9) relié au mécanisme de réduction de vitesse à engrenage planétaire (5), un second demi-arbre (4) étant monté sur le cadre de support d'engrenage planétaire (9). Le boîtier externe (3) comprend en outre un couvercle d'extrémité (63) relié de manière fixe au boîtier de moyeu (61), le couvercle d'extrémité (63) étant supporté de manière rotative sur le second demi-arbre (4) au moyen d'un palier d'extrémité d'arbre (43) et la couronne dentée (53) étant reliée au couvercle d'extrémité (63) au moyen d'un palier unidirectionnel (10). La présente invention permet réduire la résistance au glissement de la bicyclette électrique et ainsi d'augmenter la distance parcourue en roue libre.
PCT/CN2019/125695 2018-12-17 2019-12-16 Ensemble moteur de moyeu et bicyclette électrique comprenant l'ensemble moteur de moyeu WO2020125586A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201822116831.1 2018-12-17
CN201811545108.3A CN111327152A (zh) 2018-12-17 2018-12-17 一种紧凑型轮毂电机及具有其的电动自行车
CN201822116831.1U CN209283016U (zh) 2018-12-17 2018-12-17 一种紧凑型轮毂电机及具有其的电动自行车
CN201811545108.3 2018-12-17

Publications (1)

Publication Number Publication Date
WO2020125586A1 true WO2020125586A1 (fr) 2020-06-25

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PCT/CN2019/125695 WO2020125586A1 (fr) 2018-12-17 2019-12-16 Ensemble moteur de moyeu et bicyclette électrique comprenant l'ensemble moteur de moyeu

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Country Link
WO (1) WO2020125586A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12145692B2 (en) 2022-08-24 2024-11-19 Cycling Sports Group, Inc. Bicycle power system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1245128A (zh) * 1998-08-18 2000-02-23 雅马哈发动机株式会社 电动自行车的电机驱动装置
JP2009063043A (ja) * 2007-09-05 2009-03-26 Ntn Corp インホイールモータ駆動装置
CN102951251A (zh) * 2011-08-09 2013-03-06 Lg伊诺特有限公司 传动装置及使用该传动装置的牵引电机模块
CN102983671A (zh) * 2012-11-15 2013-03-20 浙江超级电气科技有限公司 一体化智能后驱轮毂电机
CN207251380U (zh) * 2017-09-29 2018-04-17 郭银书 一种直流永磁无阻轮毂电机
CN209283016U (zh) * 2018-12-17 2019-08-20 宁波麦思动力系统有限公司 一种紧凑型轮毂电机及具有其的电动自行车

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1245128A (zh) * 1998-08-18 2000-02-23 雅马哈发动机株式会社 电动自行车的电机驱动装置
JP2009063043A (ja) * 2007-09-05 2009-03-26 Ntn Corp インホイールモータ駆動装置
CN102951251A (zh) * 2011-08-09 2013-03-06 Lg伊诺特有限公司 传动装置及使用该传动装置的牵引电机模块
CN102983671A (zh) * 2012-11-15 2013-03-20 浙江超级电气科技有限公司 一体化智能后驱轮毂电机
CN207251380U (zh) * 2017-09-29 2018-04-17 郭银书 一种直流永磁无阻轮毂电机
CN209283016U (zh) * 2018-12-17 2019-08-20 宁波麦思动力系统有限公司 一种紧凑型轮毂电机及具有其的电动自行车

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12145692B2 (en) 2022-08-24 2024-11-19 Cycling Sports Group, Inc. Bicycle power system

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