WO2020181466A1 - Hub motor driving system and motor vehicle - Google Patents
Hub motor driving system and motor vehicle Download PDFInfo
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- WO2020181466A1 WO2020181466A1 PCT/CN2019/077690 CN2019077690W WO2020181466A1 WO 2020181466 A1 WO2020181466 A1 WO 2020181466A1 CN 2019077690 W CN2019077690 W CN 2019077690W WO 2020181466 A1 WO2020181466 A1 WO 2020181466A1
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- drive system
- motor drive
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- 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
Definitions
- the present invention relates to the field of motor vehicles such as electric vehicles, and in particular to an in-wheel motor drive system for motor vehicles and a motor vehicle including the in-wheel motor drive system.
- new energy vehicles such as electric vehicles integrate drive motors, planetary gear reducers, wheel bearings and braking systems in the wheel space to form a wheel hub motor drive system, where the drive motor can directly drive the wheels No transmission and drive shaft are required.
- Figure 1a shows the structure of a prior art in-wheel motor drive system.
- the in-wheel motor drive system includes a housing assembly (including a housing body 1 and a housing cover 2) assembled together, a drive motor 3, a rotor bracket 4, a sealing assembly 5, a radial bearing 6, a planetary Gear reducer 7, (axial) thrust bearing 8, output shaft 9, etc.
- the sealing assembly 5 is arranged between the housing main body 1 and the rotor support 4 for sealing the installation space in the housing assembly.
- the radial bearing 6 is arranged between the housing main body 1 and the rotor support 4 and located at the radial inner side of the sealing assembly 5, and the radial bearing 6 is used to support the rotor support 4 so that the rotor support 4 can rotate relative to the housing main body 1.
- the thrust bearing 8 is arranged between the rotor carrier 4 and the planet carrier of the planetary gear reducer 7 and is used to enable the planet carrier to rotate relative to the rotor carrier 4.
- the sealing assembly 5 In the prior art in-wheel motor drive system with the above-mentioned structure, in terms of the continuous reliability of the performance and function of the in-wheel motor drive system, the sealing assembly 5, the radial bearing 6, the planetary gear reducer 7 and the thrust bearing
- the lubrication of 8 is important, especially the lubrication of the bearing between the pin shaft of the planetary gear carrier in the planetary gear reducer 7 and the planetary gear under the high-speed load state.
- the seal assembly 5, the radial bearing 6, the planetary gear reducer 7 and the thrust bearing 8 are not sufficiently lubricated due to structural limitations.
- the amount of oil that can be stored in the in-wheel motor drive system is insufficient, and the molecular chain of the lubricating oil will be damaged by gear meshing, and the amount of lubricating oil is far unable to meet the service life of the planetary gear reducer 7. Needs.
- An object of the present invention is to provide a new type of in-wheel motor drive system, which can improve the lubrication effect of the radial bearing and seal assembly between the housing main body and the rotor support and is compared with the prior art Can increase the stock of lubricating oil.
- the invention also provides a motor vehicle including the in-wheel motor drive system.
- the present invention provides an in-wheel motor drive system as follows, which includes a housing assembly including a housing body and a housing cover assembled together in an axially opposed manner, the housing An installation space is formed inside the assembly, the housing body includes an axial portion of the housing body extending substantially along the axial direction, a drive motor, the drive motor is housed in the installation space, and the drive motor includes A stator fixed to the housing body and a rotor located radially inside the stator and capable of rotating relative to the stator; and a rotor support that supports the rotor from the radial inside and is fixed to the rotor
- the rotor support includes a first rotor support axial portion extending substantially along the axial direction and fixed to the rotor, the first rotor support axial portion being located radially outside of the housing main body axial portion,
- the in-wheel motor drive system further includes a first bearing and a seal provided in the radial gap between the radially inner surface of the axial portion of the first rotor
- the rotor support further includes a rotor support radial portion extending from the first rotor support axial portion in a radial direction toward a radial inner side, and the housing main body axial portion includes an axially facing The free end of the rotor support radial portion and spaced apart from the rotor support radial portion, the first bearing is positioned closer to the free end than the seal assembly.
- the axial portion of the first rotor support is formed with a thickened portion whose radial thickness is greater than that of the rest, and the first bearing is located on the radially inner side of the thickened portion and the axial portion of the housing body. Between the radially outer sides.
- the in-wheel motor drive system further includes a planetary gear reducer located radially inward of the axial portion of the housing main body, and the planetary gear reducer includes a second bearing located between the planetary carrier and the planetary gears , And the planetary gear carrier includes a pin shaft penetrating through the planetary gear, an oil channel communicating with the second bearing is formed inside the pin shaft, and the planetary gear reducer further includes The oil passage starts from an oil guide ring extending toward the rotor support, so that lubricating oil from the radially inner side of the oil guide ring can be guided into the oil guide passage.
- the rotor support further includes a second rotor support axial portion extending substantially in the axial direction and located at the radial inner side of the rotor support radial portion of the rotor support
- the planetary carrier further includes
- the pin shaft has end plates at both axial ends
- the in-wheel motor drive system further includes a thrust bearing provided between the axial portion of the second rotor support and the end plate, and the thrust bearing is located on the The radial inner side of the oil guide ring.
- an axial side surface of the radial portion of the rotor support facing the planetary gear reducer extends in the radial direction without protrusions in the axial direction.
- the interval between the oil guide ring and the radial portion of the rotor support is not less than the interval between the axial portion of the housing main body and the radial portion of the rotor support.
- the oil guide ring includes an oil guide ring main body extending substantially along the axial direction, and a cross-sectional profile of a portion of the radially inner peripheral surface of the oil guide ring main body away from the planetary gear reducer is formed to face A curved shape bent radially inside.
- a part of the main body of the oil guide ring is inserted into the pin shaft and installed with the pin shaft through interference fit.
- the present invention also provides the following motor vehicle, which includes the in-wheel motor drive system described in any one of the above technical solutions.
- the present invention provides a new type of in-wheel motor drive system and a motor vehicle including the in-wheel motor drive system.
- the in-wheel motor drive system changes the radial bearing and seal between the housing body and the rotor support.
- the position of the component makes it easy for the lubricating oil to reach the radial bearing and the sealing component under the action of centrifugal force and makes it possible to free up enough space for storing more lubricating oil to increase the amount of lubricating oil.
- Fig. 1a is a schematic cross-sectional view of an in-wheel motor drive system according to the prior art
- Fig. 1b is an explanatory diagram for explaining the amount of lubricating oil in the in-wheel motor drive system in Fig. 1a.
- Fig. 2a is a schematic cross-sectional view of an in-wheel motor drive system according to an embodiment of the present invention
- Fig. 2b is an enlarged schematic view of a partial structure of the in-wheel motor drive system in Fig. 2a.
- Fig. 3a is a schematic sectional view of the partial structure of the planetary gear reducer of the in-wheel motor drive system in Fig. 2a;
- Fig. 3b is a perspective view of the partial structure of the planetary gear reducer of the in-wheel motor drive system in Fig. 2a.
- Housing body 11 Axial part of housing body 2 Housing cover 3 Drive motor 31 Rotor 4 Rotor support 41 First rotor support axial part 41 T thickened part 42 Rotor support radial part 43 Second rotor support axial part 5 Seal assembly 6 Radial bearing (first bearing) 7 Planetary gear reducer 71 Sun gear shaft 72 Planetary gear 73 Planetary gear carrier 731 Pin shaft 732 End plate 74 Oil guide ring 75 Pin shaft bearing (second bearing) 8 Thrust bearing 9 Output axis
- axial refers to the axial, radial and circumferential directions of the housing assembly (including the housing body and the housing cover) of the in-wheel motor drive system, respectively.
- One side in the axial direction refers to the left side in FIGS. 2a to 3a, and the other side in the axial direction refers to the right side in FIGS. 2a to 3a.
- FIG. 2a and 2b show an in-wheel motor drive system according to an embodiment of the present invention. Except for the partial structure of the in-wheel motor drive system shown in FIG. 2b, other structures of the in-wheel motor drive system may be the same as the prior art in-wheel motor drive system in FIG.
- the in-wheel motor drive system includes a housing assembly (including a housing body 1 and a housing cover 2) assembled together, a drive motor 3, a rotor bracket 4, Seal assembly 5, radial bearing 6, planetary gear reducer 7, thrust bearing 8 and output shaft 9.
- the housing assembly constituted by the housing main body 1 and the housing cover 2 has a substantially cylindrical shape as a whole.
- the housing main body 1 is located on one axial side of the housing cover 2 and is formed with an opening facing the other axial side.
- the housing cover 2 is opposed to the housing body 1 in the axial direction A and is assembled with the housing body 1 in such a way as to cover the opening of the housing body 1, so that the housing body 1 and the housing cover 2 surround and form an installation space S.
- the bottom of the housing body 1 opposite to the opening is formed in a bent shape and the housing cover 2 is also formed in a bent shape, so that the size of the installation space S between the housing body 1 and the housing cover 2 in the axial direction A Decrease from the radial outside toward the radial inside.
- the radially inner portion of the housing body 1 is formed as a housing body axial portion 11 extending substantially along the axial direction, and the housing body axial portion 11 is formed with the first rotor support axial portion 41 described below. Relatively multi-step structure.
- the entire drive motor 3 is housed in the installation space S of the housing assembly.
- the driving motor 3 includes a stator and a rotor 31 each having an annular shape.
- stator is located at the radially inner side of the housing body 1 and is fixed relative to the housing body 1.
- a cooling assembly is preferably provided between the stator and the outer periphery of the housing body 1 to reduce the work of the stator in the drive motor 3. The temperature in the process.
- the rotor 31 is located on the radially inner side of the stator and is opposed to the stator in the radial direction R.
- the rotor 31 can rotate relative to the stator, so that when the stator generates a magnetic field, the rotor 31 can rotate in the magnetic field.
- the rotor holder 4 is used to support the rotor 31 and has a cylindrical shape as a whole.
- the rotor support 4 includes a first rotor support axial portion 41, a rotor support radial portion 42 and a second rotor support axial portion 43 which are connected to each other.
- the first rotor support axial portion 41 extends substantially along the axial direction A.
- the first rotor support axial portion 41 is located on the radially outer side of the casing main body axial portion 11 and a radial gap is formed in the radial direction R between the first rotor support axial portion 41 and the casing main body axial portion 11.
- the first rotor support axial portion 41 is fixed to the rotor 31 from the radial inner side to support the rotor 31.
- the length of the first rotor support axial portion 41 in the axial direction A is substantially equal to the length of the rotor 31 in the axial direction A.
- a thickened portion 41T with a relatively large radial thickness is formed at a portion of the first rotor support axial portion 41 for connecting with the rotor support radial portion 42.
- the rotor support radial portion 42 extends from the first rotor support axial portion 41 along the radial direction R toward the radial inner side and protrudes from the installation space S of the housing assembly.
- the radially inner end of the radial portion 42 of the rotor support is used to fix the axial portion 43 of the second rotor support together.
- the surface of the axial side of the radial portion 42 of the rotor holder does not have any convex shape, so compared with the structure of the prior art rotor holder in FIG. 1, the structure of the rotor holder 4 is simple and can be A space for storing lubricating oil is vacated at a position on the axial side of the radial portion 42 of the rotor holder.
- the second rotor support axial portion 43 extends substantially along the axial direction and is located at the radial inner side of the rotor support radial portion 42.
- the second rotor support axial portion 43 is used to fix the following sun gear shaft 71 together to drive The sun gear shaft 71 rotates together.
- the seal assembly 5 and the radial bearing 6 are arranged in the radial gap between the radially inner surface of the first rotor support axial portion 41 and the radially outer surface of the housing main body axial portion 11. In this way, compared with the structure of the in-wheel motor drive system of the prior art in FIG. 1, this arrangement can free up more space for storing lubricating oil.
- the axial portion 11 of the housing body includes a free end facing the radial portion 42 of the rotor holder in the axial direction A and spaced apart from the radial portion 42 of the rotor holder.
- the radial bearing 6 is positioned closer to the free end than the seal assembly 5. position. More specifically, the radial bearing 6 is located between the radially inner surface of the thickened portion 41T and the radially outer surface of the housing main body axial portion 11 including a part of its free end.
- the radial bearing 6 can be lubricated first before it reaches the seal assembly 5 and is isolated by the seal assembly 5. Outside the installation space S of the housing assembly.
- the free end of the axial portion 11 of the housing main body and the first rotor support axial portion 41 is between A first gap G1 exists in the axial direction A.
- the planetary gear reducer 7 is integrally located outside the installation space S surrounded by the housing body 1 and the housing cover 2, and the planetary gear reducer 7 is integrally arranged on the radial inner side of the stator. 7 is arranged coaxially with the drive motor 3. Further, with additional reference to Figures 3a and 3b, the planetary gear reducer 7 includes a sun gear shaft 71 assembled with each other, a plurality of planet gears 72, a planet gear carrier 73, a ring gear, and a pin shaft mounted on the planet gear carrier. The oil guide ring 74 of the 731 and the pin bearing 75 located between the planetary gear 72 and the planetary carrier 73, the entire planetary gear reducer is arranged on the axial side of the radial portion 42 of the rotor carrier.
- the sun gear shaft 71 is a hollow shaft and is fixed to the axial portion 43 of the second rotor support.
- a plurality of planetary gears 72 are located on the radially outer side of the sun gear shaft 71 and are evenly distributed along the circumferential direction.
- Each planetary gear 72 is formed with teeth that mesh with the outer teeth of the sun gear shaft 71, so that as the sun gear shaft 71 rotates, each planetary gear 72 can perform rotation around the respective central axis and revolution around the sun gear shaft 71.
- the planetary gear carrier 73 is located on the radially outer side of the sun gear shaft 71, and the planetary gear carrier 73 is fixed to the output shaft 9 while mounting a plurality of planetary gears 72. As the planetary gear 72 revolves, the planetary gear carrier 73 can be driven to rotate and the output shaft 9 can be driven to rotate.
- the planetary gear carrier 73 further includes a pin shaft 731 penetrating through each planet gear 72, and an oil guide channel is formed in the pin shaft 731 to communicate with the pin shaft bearing 75.
- the oil guide ring 74 extends from the oil guide passage toward the rotor holder radial portion 42 of the rotor holder 4 so that the oil from the radially inner side of the oil guide ring 74 can be guided into the oil guide passage.
- the planetary carrier 73 also includes end plates 732 fixed to both axial ends of the pin shaft 731. In this embodiment, preferably, a part of the oil guide ring 74 extends into the oil guide channel and is assembled with the pin shaft 731 through interference fit.
- the oil guide ring 74 includes an oil guide ring main body extending substantially in the axial direction, and a cross-sectional profile of a part (including a part of the free end) of the radially inner peripheral surface of the oil guide ring main body is formed to be curved toward the radially inner side.
- the free end of the oil guide ring body facing the radial portion 42 of the rotor holder forms a hook shape that is bent toward the radial inner side. In this way, it is possible to facilitate the lubricating oil from the radially inner side to flow into the oil guide passage along the radially inner circumferential surface of the oil guide ring 74.
- the second gap G2 between the free end of the oil guide ring 74 and the radial portion 42 of the rotor support.
- the size of the second gap G2 in the axial direction A is not less than the size of the first gap G1 in the axial direction A. In this way, lubricating oil is not prevented from reaching the first gap G1.
- the ring gear is located on the radially outer side of the plurality of planetary gears 72 and is fixed to the housing body 1.
- a track for the revolution of the plurality of planetary gears 72 is formed between the ring gear and the sun gear shaft 71, and the ring gear is formed with the plurality of planetary gears 72 Teeth meshing with teeth.
- the thrust bearing 8 is disposed between the second rotor bracket axial portion 43 and the end plate 732 located on the other side of the axial direction, and the thrust bearing 8 is located on the radial inner side of the oil guide ring 74. In this way, part of the lubricating oil from the oil guide ring 74 will flow into the thrust bearing 8 to improve the lubrication effect of the thrust bearing 8.
- the output shaft 9 is fixed to the planetary carrier 73 so that the driving force/torque from the rotor 31 can be output from the output shaft 9 to the wheels via the rotor carrier 4 and the planetary gear reducer 7 in sequence.
- the in-wheel motor drive system may also include other necessary components that are not described in the foregoing specific embodiments.
- the in-wheel motor drive system may also include a steering knuckle sleeve, a sensor and a braking system, etc.
- the in-wheel motor drive system may also include other necessary sealing components and bearings.
- the radial bearing 6 is preferably a ball bearing
- the pin bearing 75 and the thrust bearing 8 are preferably needle bearings.
- the inventory of the lubricating oil in the in-wheel motor drive system can reach 131ml. This can increase the inventory by almost 50% compared with the prior art in-wheel motor drive system.
- the in-wheel motor drive system according to the present invention can improve the lubrication state of each bearing and seal assembly, and more lubricating oil can prolong the service life of the planetary gear reducer.
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Abstract
The present invention relates to the field of motor vehicles such as electric vehicles, and in particular, to a hub motor driving system for a motor vehicle and a motor vehicle. The hub motor driving system changes positions of a radial beating and a sealing assembly between a housing body and a rotor spider, so that it would easy for a lubricant to reach the radial bearing and the sealing assembly under the action of a centrifugal force, and an adequate space can be provided for storing more lubricants to improve the stock of the lubricant.
Description
本发明涉及例如电动汽车等的机动车领域,具体地涉及用于机动车的轮毂电机驱动***及包括该轮毂电机驱动***的机动车。The present invention relates to the field of motor vehicles such as electric vehicles, and in particular to an in-wheel motor drive system for motor vehicles and a motor vehicle including the in-wheel motor drive system.
在现有技术中,例如电动汽车等的新能源机动车将驱动电机、行星齿轮减速器、车轮轴承和制动***等整合在车轮空间内以构成轮毂电机驱动***,其中驱动电机能够直接驱动车轮而不需要变速器和驱动轴。In the prior art, new energy vehicles such as electric vehicles integrate drive motors, planetary gear reducers, wheel bearings and braking systems in the wheel space to form a wheel hub motor drive system, where the drive motor can directly drive the wheels No transmission and drive shaft are required.
图1a示出了一种现有技术的轮毂电机驱动***的结构。如图1a所示,该轮毂电机驱动***包括组装在一起的壳体组件(包括壳体主体1和壳体盖2)、驱动电机3、转子支架4、密封组件5、径向轴承6、行星齿轮减速器7、(轴向)推力轴承8和输出轴9等。密封组件5设置在壳体主体1与转子支架4之间用于对壳体组件内的安装空间进行密封。径向轴承6设置在壳体主体1与转子支架4之间并位于密封组件5的径向内侧,该径向轴承6用于支撑转子支架4使得转子支架4能够相对于壳体主体1转动。推力轴承8设置于转子支架4和行星齿轮减速器7的行星轮架之间并用于使得行星轮架能够相对于转子支架4转动。Figure 1a shows the structure of a prior art in-wheel motor drive system. As shown in Figure 1a, the in-wheel motor drive system includes a housing assembly (including a housing body 1 and a housing cover 2) assembled together, a drive motor 3, a rotor bracket 4, a sealing assembly 5, a radial bearing 6, a planetary Gear reducer 7, (axial) thrust bearing 8, output shaft 9, etc. The sealing assembly 5 is arranged between the housing main body 1 and the rotor support 4 for sealing the installation space in the housing assembly. The radial bearing 6 is arranged between the housing main body 1 and the rotor support 4 and located at the radial inner side of the sealing assembly 5, and the radial bearing 6 is used to support the rotor support 4 so that the rotor support 4 can rotate relative to the housing main body 1. The thrust bearing 8 is arranged between the rotor carrier 4 and the planet carrier of the planetary gear reducer 7 and is used to enable the planet carrier to rotate relative to the rotor carrier 4.
在具有上述结构的现有技术的轮毂电机驱动***中,就该轮毂电机驱动***的性能和功能的持续可靠性来说,对密封组件5、径向轴承6、行星齿轮减速器7和推力轴承8的润滑均重要,尤其是在高速负荷状态下对行星齿轮减速器7中的行星轮架的销轴与行星齿轮之间的轴承的润滑非常重要。In the prior art in-wheel motor drive system with the above-mentioned structure, in terms of the continuous reliability of the performance and function of the in-wheel motor drive system, the sealing assembly 5, the radial bearing 6, the planetary gear reducer 7 and the thrust bearing The lubrication of 8 is important, especially the lubrication of the bearing between the pin shaft of the planetary gear carrier in the planetary gear reducer 7 and the planetary gear under the high-speed load state.
但是,一方面,在现有技术的轮毂电机驱动***中,由于结构限制导致对密封组件5、径向轴承6、行星齿轮减速器7和推力轴承8的润滑不够充分。另一方面,由于空间限制导致轮毂电机驱动***中能够存储的油量不足,而 且润滑油的分子链会受到齿轮啮合的损害导致润滑油的油量远不能满足行星齿轮减速器7的使用寿命内的需要。具体地,如图1b所示,在润滑油的液面位置位于轮毂电机驱动***的输出轴9的中心轴线的位置下方45mm时,该轮毂电机驱动***中的润滑油的存量只有89ml,这不能满足轮毂电机驱动***的使用寿命而必须计划对润滑油的更换。However, on the one hand, in the prior art in-wheel motor drive system, the seal assembly 5, the radial bearing 6, the planetary gear reducer 7 and the thrust bearing 8 are not sufficiently lubricated due to structural limitations. On the other hand, due to space constraints, the amount of oil that can be stored in the in-wheel motor drive system is insufficient, and the molecular chain of the lubricating oil will be damaged by gear meshing, and the amount of lubricating oil is far unable to meet the service life of the planetary gear reducer 7. Needs. Specifically, as shown in Figure 1b, when the liquid level of the lubricating oil is 45mm below the position of the center axis of the output shaft 9 of the in-wheel motor drive system, the amount of lubricating oil in the in-wheel motor drive system is only 89ml, which cannot To meet the service life of the in-wheel motor drive system, the replacement of lubricating oil must be planned.
发明内容Summary of the invention
基于上述现有技术的缺陷做出了本发明。本发明的一发明目的在于提供一种新型的轮毂电机驱动***,该轮毂电机驱动***能够改善对壳体主体与转子支架之间的径向轴承和密封组件的润滑效果并且与现有技术相比能够提高润滑油的存量。本发明还提供了一种包括该轮毂电机驱动***的机动车。The present invention was made based on the above-mentioned defects of the prior art. An object of the present invention is to provide a new type of in-wheel motor drive system, which can improve the lubrication effect of the radial bearing and seal assembly between the housing main body and the rotor support and is compared with the prior art Can increase the stock of lubricating oil. The invention also provides a motor vehicle including the in-wheel motor drive system.
为了实现上述发明目的,本发明采用如下的技术方案。In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions.
本发明提供了一种如下的轮毂电机驱动***,其包括:壳体组件,所述壳体组件包括以在轴向上相对的方式组装在一起的壳体主体和壳体盖,所述壳体组件的内部形成有安装空间,所述壳体主体包括大致沿着轴向延伸的壳体主体轴向部分,驱动电机,所述驱动电机收纳于所述安装空间内,所述驱动电机包括相对于所述壳体主体固定的定子和位于所述定子的径向内侧且能够相对于所述定子转动的转子;以及转子支架,所述转子支架从径向内侧支撑所述转子且固定于所述转子,所述转子支架包括大致沿着轴向延伸且与所述转子固定的第一转子支架轴向部分,所述第一转子支架轴向部分位于所述壳体主体轴向部分的径向外侧,所述轮毂电机驱动***还包括设置在所述第一转子支架轴向部分的径向内侧面与所述壳体主体轴向部分的径向外侧面之间的径向间隙的第一轴承和密封组件。The present invention provides an in-wheel motor drive system as follows, which includes a housing assembly including a housing body and a housing cover assembled together in an axially opposed manner, the housing An installation space is formed inside the assembly, the housing body includes an axial portion of the housing body extending substantially along the axial direction, a drive motor, the drive motor is housed in the installation space, and the drive motor includes A stator fixed to the housing body and a rotor located radially inside the stator and capable of rotating relative to the stator; and a rotor support that supports the rotor from the radial inside and is fixed to the rotor The rotor support includes a first rotor support axial portion extending substantially along the axial direction and fixed to the rotor, the first rotor support axial portion being located radially outside of the housing main body axial portion, The in-wheel motor drive system further includes a first bearing and a seal provided in the radial gap between the radially inner surface of the axial portion of the first rotor support and the radially outer surface of the axial portion of the housing body Components.
优选地,所述转子支架还包括从所述第一转子支架轴向部分沿着径向朝向径向内侧延伸的转子支架径向部分,所述壳体主体轴向部分包括在轴向上面向所述转子支架径向部分且与所述转子支架径向部分间隔开的自由端,所述第一轴承被定位在比所述密封组件靠所述自由端的位置。Preferably, the rotor support further includes a rotor support radial portion extending from the first rotor support axial portion in a radial direction toward a radial inner side, and the housing main body axial portion includes an axially facing The free end of the rotor support radial portion and spaced apart from the rotor support radial portion, the first bearing is positioned closer to the free end than the seal assembly.
优选地,所述第一转子支架轴向部分形成有径向厚度大于其余部分的加厚部,所述第一轴承位于所述加厚部的径向内侧面与所述壳体主体轴向部分的径向外侧面之间。Preferably, the axial portion of the first rotor support is formed with a thickened portion whose radial thickness is greater than that of the rest, and the first bearing is located on the radially inner side of the thickened portion and the axial portion of the housing body. Between the radially outer sides.
优选地,所述轮毂电机驱动***还包括位于所述壳体主体轴向部分的径向内侧的行星齿轮减速器,所述行星齿轮减速器包括位于行星轮架和行星轮之间的第二轴承,并且所述行星轮架包括贯通所述行星齿轮的销轴,所述销轴的内部形成有与所述第二轴承导通的导油通道,所述行星齿轮减速器还包括从所述导油通道起朝向所述转子支架延伸的导油环,使得能够将来自所述导油环的径向内侧的润滑油引导到所述导油通道内。Preferably, the in-wheel motor drive system further includes a planetary gear reducer located radially inward of the axial portion of the housing main body, and the planetary gear reducer includes a second bearing located between the planetary carrier and the planetary gears , And the planetary gear carrier includes a pin shaft penetrating through the planetary gear, an oil channel communicating with the second bearing is formed inside the pin shaft, and the planetary gear reducer further includes The oil passage starts from an oil guide ring extending toward the rotor support, so that lubricating oil from the radially inner side of the oil guide ring can be guided into the oil guide passage.
更优选地,所述转子支架还包括大致沿着轴向延伸且位于所述转子支架的转子支架径向部分的径向内侧的第二转子支架轴向部分,所述行星轮架还包括固定于所述销轴的轴向两端的端板,并且所述轮毂电机驱动***还包括在所述第二转子支架轴向部分与所述端板之间设置的推力轴承,所述推力轴承位于所述导油环的径向内侧。More preferably, the rotor support further includes a second rotor support axial portion extending substantially in the axial direction and located at the radial inner side of the rotor support radial portion of the rotor support, and the planetary carrier further includes The pin shaft has end plates at both axial ends, and the in-wheel motor drive system further includes a thrust bearing provided between the axial portion of the second rotor support and the end plate, and the thrust bearing is located on the The radial inner side of the oil guide ring.
更优选地,所述转子支架径向部分的面向所述行星齿轮减速器的轴向一侧面以在轴向上无凸起的形式沿着径向延伸。More preferably, an axial side surface of the radial portion of the rotor support facing the planetary gear reducer extends in the radial direction without protrusions in the axial direction.
更优选地,在轴向上,所述导油环与所述转子支架径向部分之间的间隔不小于所述壳体主体轴向部分与所述转子支架径向部分之间的间隔。More preferably, in the axial direction, the interval between the oil guide ring and the radial portion of the rotor support is not less than the interval between the axial portion of the housing main body and the radial portion of the rotor support.
更优选地,所述导油环包括大致沿着轴向延伸的导油环主体,所述导油环主体的径向内周面的远离所述行星齿轮减速器的一部分的截面轮廓形成 为朝向径向内侧弯曲的曲线形状。More preferably, the oil guide ring includes an oil guide ring main body extending substantially along the axial direction, and a cross-sectional profile of a portion of the radially inner peripheral surface of the oil guide ring main body away from the planetary gear reducer is formed to face A curved shape bent radially inside.
更优选地,所述导油环主体的一部分***所述销轴内且与所述销轴通过过盈配合安装在一起。More preferably, a part of the main body of the oil guide ring is inserted into the pin shaft and installed with the pin shaft through interference fit.
本发明还提供了一种如下的机动车,其包括以上技术方案中任意一项技术方案所述的轮毂电机驱动***。The present invention also provides the following motor vehicle, which includes the in-wheel motor drive system described in any one of the above technical solutions.
通过采用上述技术方案,本发明提供了一种新型的轮毂电机驱动***和包括该轮毂电机驱动***的机动车,该轮毂电机驱动***改变了壳体主体和转子支架之间的径向轴承和密封组件的位置,使得润滑油在离心力的作用下容易到达该径向轴承和密封组件并且使得能够腾出足够的空间用于存储更多的润滑油进而提高润滑油的存量。By adopting the above technical solutions, the present invention provides a new type of in-wheel motor drive system and a motor vehicle including the in-wheel motor drive system. The in-wheel motor drive system changes the radial bearing and seal between the housing body and the rotor support. The position of the component makes it easy for the lubricating oil to reach the radial bearing and the sealing component under the action of centrifugal force and makes it possible to free up enough space for storing more lubricating oil to increase the amount of lubricating oil.
图1a是根据现有技术的轮毂电机驱动***的剖视示意图;图1b是用于说明图1a中的轮毂电机驱动***的润滑油的油量的说明图。Fig. 1a is a schematic cross-sectional view of an in-wheel motor drive system according to the prior art; Fig. 1b is an explanatory diagram for explaining the amount of lubricating oil in the in-wheel motor drive system in Fig. 1a.
图2a是根据本发明的一实施方式的轮毂电机驱动***的剖视示意图;图2b是图2a中的轮毂电机驱动***的局部结构的放大示意图。Fig. 2a is a schematic cross-sectional view of an in-wheel motor drive system according to an embodiment of the present invention; Fig. 2b is an enlarged schematic view of a partial structure of the in-wheel motor drive system in Fig. 2a.
图3a是图2a中的轮毂电机驱动***的行星齿轮减速器的局部结构的剖视示意图;图3b是图2a中的轮毂电机驱动***的行星齿轮减速器的局部结构的立体示意图。Fig. 3a is a schematic sectional view of the partial structure of the planetary gear reducer of the in-wheel motor drive system in Fig. 2a; Fig. 3b is a perspective view of the partial structure of the planetary gear reducer of the in-wheel motor drive system in Fig. 2a.
附图标记说明Description of reference signs
1壳体主体 11壳体主体轴向部分 2壳体盖 3驱动电机 31转子 4转子支架 41第一转子支架轴向部分 41T加厚部 42转子支架径向部分 43第二转子支架轴向部分 5密封组件 6径向轴承(第一轴承) 7行星齿轮减速器 71太阳轮轴 72行星齿轮 73行星轮架 731销轴 732端板 74导油环 75销轴轴承(第二轴承) 8推力轴承 9 输出轴1 Housing body 11 Axial part of housing body 2 Housing cover 3 Drive motor 31 Rotor 4 Rotor support 41 First rotor support axial part 41 T thickened part 42 Rotor support radial part 43 Second rotor support axial part 5 Seal assembly 6 Radial bearing (first bearing) 7 Planetary gear reducer 71 Sun gear shaft 72 Planetary gear 73 Planetary gear carrier 731 Pin shaft 732 End plate 74 Oil guide ring 75 Pin shaft bearing (second bearing) 8 Thrust bearing 9 Output axis
S安装空间 G1第一间隙 G2第二间隙 A轴向 R径向。S installation space G1 first gap G2 second gap A axis R radial.
以下将参照说明书附图来详细地说明本发明的具体实施方式。在本说明书中,“轴向”、“径向”和“周向”分别是指轮毂电机驱动***的壳体组件(包括壳体主体和壳体盖)的轴向、径向和周向,轴向一侧是指图2a至图3a中的左侧,轴向另一侧是指图2a至图3a中的右侧。The specific embodiments of the present invention will be described in detail below with reference to the drawings of the specification. In this specification, "axial", "radial" and "circumferential" refer to the axial, radial and circumferential directions of the housing assembly (including the housing body and the housing cover) of the in-wheel motor drive system, respectively. One side in the axial direction refers to the left side in FIGS. 2a to 3a, and the other side in the axial direction refers to the right side in FIGS. 2a to 3a.
图2a和图2b中示出了根据本发明一实施方式的轮毂电机驱动***。除了图2b所示的该轮毂电机驱动***的局部结构之外,该轮毂电机驱动***的其它结构可以与图1中的现有技术的轮毂电机驱动***相同。Figures 2a and 2b show an in-wheel motor drive system according to an embodiment of the present invention. Except for the partial structure of the in-wheel motor drive system shown in FIG. 2b, other structures of the in-wheel motor drive system may be the same as the prior art in-wheel motor drive system in FIG.
如图2a和图2b所示,根据本发明的一实施方式的轮毂电机驱动***包括组装在一起的壳体组件(包括壳体主体1和壳体盖2)、驱动电机3、转子支架4、密封组件5、径向轴承6、行星齿轮减速器7、推力轴承8和输出轴9。As shown in Figures 2a and 2b, the in-wheel motor drive system according to an embodiment of the present invention includes a housing assembly (including a housing body 1 and a housing cover 2) assembled together, a drive motor 3, a rotor bracket 4, Seal assembly 5, radial bearing 6, planetary gear reducer 7, thrust bearing 8 and output shaft 9.
在本实施方式中,由壳体主体1和壳体盖2构成的壳体组件整体呈大致筒状。壳体主体1位于壳体盖2的轴向一侧且形成有朝向轴向另一侧的开口。壳体盖2与壳体主体1在轴向A上相对并且以盖住壳体主体1的开口的方式与壳体主体1组装在一起,使得壳体主体1和壳体盖2包围形成安装空间S。壳体主体1的与开口相对的底部形成为弯折形状并且壳体盖2也形成为弯折形状,使得壳体主体1和壳体盖2之间的安装空间S在轴向A上的尺寸从径向外侧朝向径向内侧减小。In this embodiment, the housing assembly constituted by the housing main body 1 and the housing cover 2 has a substantially cylindrical shape as a whole. The housing main body 1 is located on one axial side of the housing cover 2 and is formed with an opening facing the other axial side. The housing cover 2 is opposed to the housing body 1 in the axial direction A and is assembled with the housing body 1 in such a way as to cover the opening of the housing body 1, so that the housing body 1 and the housing cover 2 surround and form an installation space S. The bottom of the housing body 1 opposite to the opening is formed in a bent shape and the housing cover 2 is also formed in a bent shape, so that the size of the installation space S between the housing body 1 and the housing cover 2 in the axial direction A Decrease from the radial outside toward the radial inside.
进一步地,壳体主体1的径向内侧部分形成为大致沿着轴向延伸的壳体主体轴向部分11,该壳体主体轴向部分11形成与下述的第一转子支架轴向部分41相对的多台阶结构。Further, the radially inner portion of the housing body 1 is formed as a housing body axial portion 11 extending substantially along the axial direction, and the housing body axial portion 11 is formed with the first rotor support axial portion 41 described below. Relatively multi-step structure.
在本实施方式中,驱动电机3整体收纳于壳体组件的安装空间S内。驱动电机3包括均呈圆环状的定子和转子31。In this embodiment, the entire drive motor 3 is housed in the installation space S of the housing assembly. The driving motor 3 includes a stator and a rotor 31 each having an annular shape.
具体地,定子位于壳体主体1的径向内侧且相对于壳体主体1固定,定子与壳体主体1的外周部之间优选设置有冷却组件,以用于降低定子在驱动电机3的工作过程中的温度。Specifically, the stator is located at the radially inner side of the housing body 1 and is fixed relative to the housing body 1. A cooling assembly is preferably provided between the stator and the outer periphery of the housing body 1 to reduce the work of the stator in the drive motor 3. The temperature in the process.
转子31位于定子的径向内侧且与定子在径向R上相对。转子31能够相对于定子转动,使得当定子产生磁场的情况下转子31能够在该磁场中转动。The rotor 31 is located on the radially inner side of the stator and is opposed to the stator in the radial direction R. The rotor 31 can rotate relative to the stator, so that when the stator generates a magnetic field, the rotor 31 can rotate in the magnetic field.
在本实施方式中,转子支架4用于支撑转子31且整体具有圆筒形状。该转子支架4包括彼此连接在一起的第一转子支架轴向部分41、转子支架径向部分42和第二转子支架轴向部分43。In this embodiment, the rotor holder 4 is used to support the rotor 31 and has a cylindrical shape as a whole. The rotor support 4 includes a first rotor support axial portion 41, a rotor support radial portion 42 and a second rotor support axial portion 43 which are connected to each other.
具体地,第一转子支架轴向部分41大致沿着轴向A延伸。第一转子支架轴向部分41位于壳体主体轴向部分11的径向外侧并且第一转子支架轴向部分41与壳体主体轴向部分11之间在径向R上形成径向间隙。该第一转子支架轴向部分41从径向内侧固定于转子31以支撑转子31。第一转子支架轴向部分41在轴向A上的长度与转子31的在轴向A上的长度大致相等。进一步地,第一转子支架轴向部分41的用于与转子支架径向部分42连接的部位处形成径向厚度较大的加厚部41T。Specifically, the first rotor support axial portion 41 extends substantially along the axial direction A. The first rotor support axial portion 41 is located on the radially outer side of the casing main body axial portion 11 and a radial gap is formed in the radial direction R between the first rotor support axial portion 41 and the casing main body axial portion 11. The first rotor support axial portion 41 is fixed to the rotor 31 from the radial inner side to support the rotor 31. The length of the first rotor support axial portion 41 in the axial direction A is substantially equal to the length of the rotor 31 in the axial direction A. Further, a thickened portion 41T with a relatively large radial thickness is formed at a portion of the first rotor support axial portion 41 for connecting with the rotor support radial portion 42.
转子支架径向部分42从第一转子支架轴向部分41沿着径向R朝向径向内侧延伸并从壳体组件的安装空间S伸出。该转子支架径向部分42的径向内侧端部用于与第二转子支架轴向部分43固定在一起。在本实施方式中,转子支架径向部分42的轴向一侧的表面没有任何凸起形状,因而与图1中的现有技术的转子支架的结构相比该转子支架4的结构简单并且能够在转子支架径向部分42的轴向一侧的位置腾出用于存储润滑油的空间。The rotor support radial portion 42 extends from the first rotor support axial portion 41 along the radial direction R toward the radial inner side and protrudes from the installation space S of the housing assembly. The radially inner end of the radial portion 42 of the rotor support is used to fix the axial portion 43 of the second rotor support together. In this embodiment, the surface of the axial side of the radial portion 42 of the rotor holder does not have any convex shape, so compared with the structure of the prior art rotor holder in FIG. 1, the structure of the rotor holder 4 is simple and can be A space for storing lubricating oil is vacated at a position on the axial side of the radial portion 42 of the rotor holder.
第二转子支架轴向部分43大致沿着轴向延伸且位于转子支架径向部分 42的径向内侧,该第二转子支架轴向部分43用于与下述的太阳轮轴71固定在一起以带动太阳轮轴71一起转动。The second rotor support axial portion 43 extends substantially along the axial direction and is located at the radial inner side of the rotor support radial portion 42. The second rotor support axial portion 43 is used to fix the following sun gear shaft 71 together to drive The sun gear shaft 71 rotates together.
在本实施方式中,密封组件5和径向轴承6设置在第一转子支架轴向部分41的径向内侧面与壳体主体轴向部分11的径向外侧面之间的径向间隙内。这样,与图1中的现有技术的轮毂电机驱动***的结构相比,这种设置能够腾出更多的用于存储润滑油的空间。In this embodiment, the seal assembly 5 and the radial bearing 6 are arranged in the radial gap between the radially inner surface of the first rotor support axial portion 41 and the radially outer surface of the housing main body axial portion 11. In this way, compared with the structure of the in-wheel motor drive system of the prior art in FIG. 1, this arrangement can free up more space for storing lubricating oil.
另外,壳体主体轴向部分11包括在轴向A上面向转子支架径向部分42且与转子支架径向部分42间隔开的自由端,径向轴承6被定位成比密封组件5靠自由端的位置。更具体地,径向轴承6位于加厚部41T的径向内侧面与壳体主体轴向部分11的包括其自由端的一部分的径向外侧面之间。这样,在润滑油在离心力的作用下流入壳体主体轴向部分11与第一转子支架轴向部分41之间之后能够首先对径向轴承6润滑才会到达密封组件5而被密封组件5隔离在壳体组件的安装空间S之外。In addition, the axial portion 11 of the housing body includes a free end facing the radial portion 42 of the rotor holder in the axial direction A and spaced apart from the radial portion 42 of the rotor holder. The radial bearing 6 is positioned closer to the free end than the seal assembly 5. position. More specifically, the radial bearing 6 is located between the radially inner surface of the thickened portion 41T and the radially outer surface of the housing main body axial portion 11 including a part of its free end. In this way, after the lubricating oil flows between the axial portion 11 of the housing main body and the axial portion 41 of the first rotor bracket under the action of centrifugal force, the radial bearing 6 can be lubricated first before it reaches the seal assembly 5 and is isolated by the seal assembly 5. Outside the installation space S of the housing assembly.
进一步地,为了保证润滑油能够流入壳体主体轴向部分11与第一转子支架轴向部分41之间,壳体主体轴向部分11的自由端与第一转子支架轴向部分41之间在轴向A上存在第一间隙G1。Further, in order to ensure that lubricating oil can flow between the axial portion 11 of the housing main body and the axial portion 41 of the first rotor support, the free end of the axial portion 11 of the housing main body and the first rotor support axial portion 41 is between A first gap G1 exists in the axial direction A.
在本实施方式中,行星齿轮减速器7整***于壳体主体1和壳体盖2包围形成的安装空间S的外部并且行星齿轮减速器7整体配置在定子的径向内侧,该行星齿轮减速器7与驱动电机3同轴地配置。进一步地,附加地参照图3a和图3b,该行星齿轮减速器7包括彼此组装在一起的太阳轮轴71、多个行星齿轮72、行星轮架73、齿圈、安装于行星轮架的销轴731的导油环74以及位于行星齿轮72和行星轮架73之间的销轴轴承75,整个行星齿轮减速器配置在转子支架径向部分42的轴向一侧。In this embodiment, the planetary gear reducer 7 is integrally located outside the installation space S surrounded by the housing body 1 and the housing cover 2, and the planetary gear reducer 7 is integrally arranged on the radial inner side of the stator. 7 is arranged coaxially with the drive motor 3. Further, with additional reference to Figures 3a and 3b, the planetary gear reducer 7 includes a sun gear shaft 71 assembled with each other, a plurality of planet gears 72, a planet gear carrier 73, a ring gear, and a pin shaft mounted on the planet gear carrier. The oil guide ring 74 of the 731 and the pin bearing 75 located between the planetary gear 72 and the planetary carrier 73, the entire planetary gear reducer is arranged on the axial side of the radial portion 42 of the rotor carrier.
具体地,该太阳轮轴71为空心轴并且固定于第二转子支架轴向部分43。Specifically, the sun gear shaft 71 is a hollow shaft and is fixed to the axial portion 43 of the second rotor support.
多个行星齿轮72位于太阳轮轴71的径向外侧且沿着周向均匀分布,各行星齿轮72均形成有与太阳轮轴71的外齿啮合的齿,使得随着太阳轮轴71的转动各行星齿轮72能够进行绕着各自的中心轴的自转和绕着太阳轮轴71的公转。A plurality of planetary gears 72 are located on the radially outer side of the sun gear shaft 71 and are evenly distributed along the circumferential direction. Each planetary gear 72 is formed with teeth that mesh with the outer teeth of the sun gear shaft 71, so that as the sun gear shaft 71 rotates, each planetary gear 72 can perform rotation around the respective central axis and revolution around the sun gear shaft 71.
行星轮架73位于太阳轮轴71的径向外侧,并且该行星轮架73在安装多个行星齿轮72的同时固定于输出轴9。随着行星齿轮72进行公转,能够带动行星轮架73进行转动进而带动输出轴9转动。The planetary gear carrier 73 is located on the radially outer side of the sun gear shaft 71, and the planetary gear carrier 73 is fixed to the output shaft 9 while mounting a plurality of planetary gears 72. As the planetary gear 72 revolves, the planetary gear carrier 73 can be driven to rotate and the output shaft 9 can be driven to rotate.
进一步地,行星轮架73还包括贯通各行星齿轮72的销轴731,销轴731的内部形成有与销轴轴承75导通的导油通道。导油环74从导油通道起朝向转子支架4的转子支架径向部分42延伸,使得能够将来自导油环74的径向内侧的油引导到导油通道内。行星轮架73还包括固定于销轴731的轴向两端的端板732。在本实施方式中,优选地,导油环74的一部分伸入导油通道内并且与销轴731通过过盈配合装配在一起。Furthermore, the planetary gear carrier 73 further includes a pin shaft 731 penetrating through each planet gear 72, and an oil guide channel is formed in the pin shaft 731 to communicate with the pin shaft bearing 75. The oil guide ring 74 extends from the oil guide passage toward the rotor holder radial portion 42 of the rotor holder 4 so that the oil from the radially inner side of the oil guide ring 74 can be guided into the oil guide passage. The planetary carrier 73 also includes end plates 732 fixed to both axial ends of the pin shaft 731. In this embodiment, preferably, a part of the oil guide ring 74 extends into the oil guide channel and is assembled with the pin shaft 731 through interference fit.
更具体地,导油环74包括大致沿着轴向延伸的导油环主体,导油环主体的径向内周面的一部分(包括自由端的一部分)的截面轮廓形成为朝向径向内侧弯曲的曲线形状,导油环主体的面向转子支架径向部分42的自由端形成朝向径向内侧弯曲的弯钩形状。这样,能够便于来自径向内侧的润滑油沿着导油环74的径向内周面流入导油通道内。进一步地,在轴向A上,导油环74的自由端与转子支架径向部分42之间存在第二间隙G2。该第二间隙G2在轴向A上的尺寸不小于上述第一间隙G1的在轴向A上的尺寸。这样,不会阻碍润滑油到达第一间隙G1。More specifically, the oil guide ring 74 includes an oil guide ring main body extending substantially in the axial direction, and a cross-sectional profile of a part (including a part of the free end) of the radially inner peripheral surface of the oil guide ring main body is formed to be curved toward the radially inner side. In a curved shape, the free end of the oil guide ring body facing the radial portion 42 of the rotor holder forms a hook shape that is bent toward the radial inner side. In this way, it is possible to facilitate the lubricating oil from the radially inner side to flow into the oil guide passage along the radially inner circumferential surface of the oil guide ring 74. Further, in the axial direction A, there is a second gap G2 between the free end of the oil guide ring 74 and the radial portion 42 of the rotor support. The size of the second gap G2 in the axial direction A is not less than the size of the first gap G1 in the axial direction A. In this way, lubricating oil is not prevented from reaching the first gap G1.
齿圈位于多个行星齿轮72的径向外侧并且固定于壳体主体1,在齿圈和太阳轮轴71之间形成供多个行星齿轮72公转的轨道,齿圈形成有与多个行星齿轮72的齿啮合的齿。The ring gear is located on the radially outer side of the plurality of planetary gears 72 and is fixed to the housing body 1. A track for the revolution of the plurality of planetary gears 72 is formed between the ring gear and the sun gear shaft 71, and the ring gear is formed with the plurality of planetary gears 72 Teeth meshing with teeth.
在本实施方式中,推力轴承8设置在第二转子支架轴向部分43与位于轴向另一侧的端板732之间,推力轴承8位于导油环74的径向内侧。这样,来自导油环74的一部分润滑油会流入该推力轴承8,以提高对推力轴承8的润滑效果。In this embodiment, the thrust bearing 8 is disposed between the second rotor bracket axial portion 43 and the end plate 732 located on the other side of the axial direction, and the thrust bearing 8 is located on the radial inner side of the oil guide ring 74. In this way, part of the lubricating oil from the oil guide ring 74 will flow into the thrust bearing 8 to improve the lubrication effect of the thrust bearing 8.
在本实施方式中,输出轴9与行星轮架73固定在一起,这样来自转子31的驱动力/扭矩能够顺次经由转子支架4和行星齿轮减速器7而从输出轴9输出到车轮。In this embodiment, the output shaft 9 is fixed to the planetary carrier 73 so that the driving force/torque from the rotor 31 can be output from the output shaft 9 to the wheels via the rotor carrier 4 and the planetary gear reducer 7 in sequence.
以上详细地说明了根据本发明的轮毂电机驱动***的具体实施方式,但是还需要补充说明的是:The specific implementation of the in-wheel motor drive system according to the present invention has been described in detail above, but it needs to be supplemented:
I.根据本发明的轮毂电机驱动***还可以包括在上述具体实施方式中未进行说明的其它必要的部件。例如,该轮毂电机驱动***还包括转向节套筒、传感器和制动***等,并且该轮毂电机驱动***还可以包括其它必要的密封组件和轴承。I. The in-wheel motor drive system according to the present invention may also include other necessary components that are not described in the foregoing specific embodiments. For example, the in-wheel motor drive system may also include a steering knuckle sleeve, a sensor and a braking system, etc., and the in-wheel motor drive system may also include other necessary sealing components and bearings.
II.虽然在上述具体实施方式中没有明确说明,但是应当理解径向轴承6优选为球轴承,销轴轴承75和推力轴承8优选为滚针轴承。II. Although not explicitly stated in the above specific embodiments, it should be understood that the radial bearing 6 is preferably a ball bearing, and the pin bearing 75 and the thrust bearing 8 are preferably needle bearings.
III.通过采用上述技术方案,在润滑油的液面位置位于根据本发明的轮毂电机驱动***的输出轴9的中心轴线的位置下方45mm时,该轮毂电机驱动***中的润滑油的存量能够达到131ml。这与现有技术的轮毂电机驱动***相比能够增大几乎50%的存量。这样,根据本发明的轮毂电机驱动***能够改善对各轴承和密封组件的润滑状态,而且更多的润滑油存量能够延长行星齿轮减速器的使用寿命。III. By adopting the above technical solution, when the liquid level of the lubricating oil is 45mm below the position of the center axis of the output shaft 9 of the in-wheel motor drive system according to the present invention, the inventory of the lubricating oil in the in-wheel motor drive system can reach 131ml. This can increase the inventory by almost 50% compared with the prior art in-wheel motor drive system. In this way, the in-wheel motor drive system according to the present invention can improve the lubrication state of each bearing and seal assembly, and more lubricating oil can prolong the service life of the planetary gear reducer.
Claims (10)
- 一种轮毂电机驱动***,其包括:A wheel hub motor drive system, which includes:壳体组件,所述壳体组件包括以在轴向上相对的方式组装在一起的壳体主体和壳体盖,所述壳体组件的内部形成有安装空间,所述壳体主体包括大致沿着轴向延伸的壳体主体轴向部分,A housing assembly, the housing assembly includes a housing body and a housing cover assembled together in an axially opposed manner, an installation space is formed inside the housing assembly, and the housing body includes a substantially Along the axially extending axial part of the housing body,驱动电机,所述驱动电机收纳于所述安装空间内,所述驱动电机包括相对于所述壳体主体固定的定子和位于所述定子的径向内侧且能够相对于所述定子转动的转子;以及A drive motor, the drive motor being housed in the installation space, the drive motor including a stator fixed relative to the housing body and a rotor located radially inside the stator and capable of rotating relative to the stator; as well as转子支架,所述转子支架从径向内侧支撑所述转子且固定于所述转子,所述转子支架包括大致沿着轴向延伸且与所述转子固定的第一转子支架轴向部分,A rotor support, the rotor support supports the rotor from a radial inner side and is fixed to the rotor, the rotor support includes a first rotor support axial portion extending substantially along the axial direction and fixed to the rotor,所述第一转子支架轴向部分位于所述壳体主体轴向部分的径向外侧,所述轮毂电机驱动***还包括设置在所述第一转子支架轴向部分的径向内侧面与所述壳体主体轴向部分的径向外侧面之间的径向间隙的第一轴承和密封组件。The axial portion of the first rotor bracket is located on the radially outer side of the axial portion of the housing main body, and the in-wheel motor drive system further includes a radially inner surface disposed on the axial portion of the first rotor bracket and the The first bearing and sealing assembly of the radial gap between the radially outer side surfaces of the axial portion of the housing main body.
- 根据权利要求1所述的轮毂电机驱动***,其特征在于,所述转子支架还包括从所述第一转子支架轴向部分沿着径向朝向径向内侧延伸的转子支架径向部分,所述壳体主体轴向部分包括在轴向上面向所述转子支架径向部分且与所述转子支架径向部分间隔开的自由端,所述第一轴承被定位在比所述密封组件靠所述自由端的位置。The in-wheel motor drive system according to claim 1, wherein the rotor support further comprises a rotor support radial portion extending from the first rotor support axial portion in the radial direction toward the radial inner side, the The axial portion of the housing body includes a free end facing the radial portion of the rotor holder in the axial direction and spaced apart from the radial portion of the rotor holder, and the first bearing is positioned closer to the seal assembly. The position of the free end.
- 根据权利要求1或2所述的轮毂电机驱动***,其特征在于,所述第一转子支架轴向部分形成有径向厚度大于其余部分的加厚部,所述第一轴承位于所述加厚部的径向内侧面与所述壳体主体轴向部分的径向外侧面之间。The in-wheel motor drive system according to claim 1 or 2, wherein the axial portion of the first rotor support is formed with a thickened portion with a radial thickness greater than the rest, and the first bearing is located at the thickened portion. Between the radially inner surface of the portion and the radially outer surface of the axial portion of the housing body.
- 根据权利要求1至3中任一项所述的轮毂电机驱动***,其特征在于,所述轮毂电机驱动***还包括位于所述壳体主体轴向部分的径向内侧的行 星齿轮减速器,所述行星齿轮减速器包括位于行星轮架和行星轮之间的第二轴承,并且The in-wheel motor drive system according to any one of claims 1 to 3, wherein the in-wheel motor drive system further comprises a planetary gear reducer located on the radially inner side of the axial portion of the housing body, so The planetary gear reducer includes a second bearing located between the planetary carrier and the planetary gears, and所述行星轮架包括贯通所述行星齿轮的销轴,所述销轴的内部形成有与所述第二轴承导通的导油通道,所述行星齿轮减速器还包括从所述导油通道起朝向所述转子支架延伸的导油环,使得能够将来自所述导油环的径向内侧的润滑油引导到所述导油通道内。The planetary gear carrier includes a pin shaft penetrating through the planetary gears, an oil guide passage communicating with the second bearing is formed inside the pin shaft, and the planetary gear reducer further includes an oil guide passage The oil guide ring extending toward the rotor bracket enables the lubricating oil from the radially inner side of the oil guide ring to be guided into the oil guide passage.
- 根据权利要求4所述的轮毂电机驱动***,其特征在于,所述转子支架还包括大致沿着轴向延伸且位于所述转子支架的转子支架径向部分的径向内侧的第二转子支架轴向部分,所述行星轮架还包括固定于所述销轴的轴向两端的端板,并且The in-wheel motor drive system according to claim 4, wherein the rotor support further comprises a second rotor support shaft extending substantially along the axial direction and located at the radial inner side of the rotor support radial portion of the rotor support In the forward part, the planetary carrier further includes end plates fixed to both axial ends of the pin shaft, and所述轮毂电机驱动***还包括在所述第二转子支架轴向部分与所述端板之间设置的推力轴承,所述推力轴承位于所述导油环的径向内侧。The in-wheel motor drive system further includes a thrust bearing provided between the axial portion of the second rotor support and the end plate, and the thrust bearing is located on the radial inner side of the oil guide ring.
- 根据权利要求4或5所述的轮毂电机驱动***,其特征在于,所述转子支架径向部分的面向所述行星齿轮减速器的轴向一侧面以在轴向上无凸起的形式沿着径向延伸。The in-wheel motor drive system according to claim 4 or 5, wherein the radial portion of the rotor bracket is along the axial side surface facing the planetary gear reducer in a form without protrusions in the axial direction. Radial extension.
- 根据权利要求4至6中任一项所述的轮毂电机驱动***,其特征在于,The in-wheel motor drive system according to any one of claims 4 to 6, wherein:在轴向上,所述导油环与所述转子支架径向部分之间的间隔不小于所述壳体主体轴向部分与所述转子支架径向部分之间的间隔。In the axial direction, the interval between the oil guide ring and the radial portion of the rotor support is not less than the interval between the axial portion of the housing main body and the radial portion of the rotor support.
- 根据权利要求4至7中任一项所述的轮毂电机驱动***,其特征在于,所述导油环包括大致沿着轴向延伸的导油环主体,所述导油环主体的径向内周面的远离所述行星齿轮减速器的一部分的截面轮廓形成为朝向径向内侧弯曲的曲线形状。The in-wheel motor drive system according to any one of claims 4 to 7, wherein the oil guide ring comprises an oil guide ring main body extending substantially along the axial direction, and the oil guide ring main body is radially inwardly The cross-sectional profile of a part of the peripheral surface away from the planetary gear reducer is formed in a curved shape curved toward the radially inner side.
- 根据权利要求8所述的轮毂电机驱动***,其特征在于,所述导油环主体的一部分***所述销轴内且与所述销轴通过过盈配合安装在一起。The in-wheel motor drive system according to claim 8, wherein a part of the oil guide ring body is inserted into the pin shaft and is installed with the pin shaft through interference fit.
- 一种机动车,其包括权利要求1至9中任一项所述的轮毂电机驱动***。A motor vehicle comprising the in-wheel motor drive system according to any one of claims 1 to 9.
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