CN116409138A - In-wheel motor driving system and motor vehicle - Google Patents

In-wheel motor driving system and motor vehicle Download PDF

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Publication number
CN116409138A
CN116409138A CN202210004516.8A CN202210004516A CN116409138A CN 116409138 A CN116409138 A CN 116409138A CN 202210004516 A CN202210004516 A CN 202210004516A CN 116409138 A CN116409138 A CN 116409138A
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CN
China
Prior art keywords
wheel
motor
mounting
output shaft
drive system
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
CN202210004516.8A
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Chinese (zh)
Inventor
蔡向阳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
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Publication date
Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Priority to CN202210004516.8A priority Critical patent/CN116409138A/en
Publication of CN116409138A publication Critical patent/CN116409138A/en
Pending legal-status Critical Current

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    • 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
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K7/0007—Disposition of motor in, or adjacent to, traction wheel the motor being electric
    • 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
    • B60K17/043—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel
    • B60K17/046—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel with planetary gearing having orbital motion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
    • B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
    • B60T1/06—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels
    • B60T1/065—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels employing disc
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D7/00—Steering linkage; Stub axles or their mountings
    • B62D7/18—Steering knuckles; King pins
    • 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
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K2007/0092—Disposition of motor in, or adjacent to, traction wheel the motor axle being coaxial to the wheel axle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)

Abstract

The application provides an in-wheel motor driving system and a motor vehicle. In the in-wheel motor driving system, a steering knuckle is taken as a reference, a brake system and a wheel bearing are positioned on the opposite side of the driving mechanism, a brake caliper mechanism of the brake system and an outer ring of the wheel bearing are detachably arranged on the steering knuckle, and an inner ring of the wheel bearing is in transmission connection with an output shaft of the driving system through a spline. The above structural design is beneficial to the adaptation and disassembly of the steering knuckle and other structures of the in-wheel motor driving system and the different braking systems and wheel bearings, that is to say, the in-wheel motor driving system according to the application can adapt to the wheels with the different braking systems and wheel bearings without structural adjustment. Thereby, the versatility of the in-wheel motor drive system of the present application is improved.

Description

In-wheel motor driving system and motor vehicle
Technical Field
The present application relates to the field of motor vehicles, such as electric vehicles and the like, and in particular to an in-wheel motor drive system for a motor vehicle and a motor vehicle including the in-wheel motor drive system.
Background
In the prior art, new energy vehicles such as electric vehicles and the like still mainly use a central driving motor, a clutch, a transmission and a differential to constitute a driving system for transmitting torque for driving wheels, which results in a long transmission path of the torque, so that the power loss of the driving system is high and the efficiency is low, which seriously affects the driving distance of the new energy vehicle. Accordingly, the skilled person has developed an in-wheel motor drive system having a short torque transmission path to overcome the above problems.
However, existing in-wheel motor drive systems typically integrate the drive motor, transmission, and wheel brake system and wheel bearings, and once set, only certain wheel bearings and brake systems can be assembled, and adapting other wheel bearings and brake systems requires changing the overall in-wheel motor drive system configuration. Therefore, the conventional in-wheel motor driving system is poor in versatility.
Disclosure of Invention
The present application has been made based on the above-described drawbacks of the prior art. It is an object of the present application to provide a novel in-wheel motor drive system that can easily adapt to wheels having different wheel bearings and braking systems, thus improving the versatility of the in-wheel motor system. It is another object of the present application to provide a motor vehicle including the above in-wheel motor drive system.
In order to achieve the above object, the present application adopts the following technical solutions.
The application provides an in-wheel motor drive system as follows, in-wheel motor drive system includes:
a knuckle including a mounting portion;
the driving mechanism is detachably mounted on the mounting part and comprises a motor assembly, a planetary gear speed reducing mechanism, a shell assembly and an output shaft, wherein the motor assembly is in transmission connection with the output shaft all the time through the planetary gear speed reducing mechanism, the output shaft penetrates through the mounting part along the axial direction of the output shaft and can rotate relative to the mounting part, and the planetary gear speed reducing mechanism is positioned in a first mounting space surrounded by the shell assembly and the mounting part;
the wheel bearing comprises an inner ring and an outer ring, the outer ring is detachably arranged on the mounting part, and the inner ring is in transmission connection with the output shaft through a spline; and
the braking system comprises a braking disc and a braking clamp mechanism, the braking disc is relatively fixed with the output shaft, the braking clamp mechanism is detachably arranged on the mounting part,
in the axial direction, the drive mechanism is located on one side of the mounting portion, and the wheel bearing and the brake system are located on the other side of the mounting portion.
In an alternative, the driving mechanism comprises a stator, a rotor and a motor shaft, the planetary gear speed reducing mechanism comprises a sun gear, a planetary gear carrier and a gear ring,
the rotor can rotate relative to the stator, the rotor is in transmission connection with the sun gear through the motor shaft, the output shaft is in transmission connection with the planet carrier, the gear ring is fixed with the mounting part,
the motor shaft is coaxially arranged with the output shaft.
In another alternative, the brake disc is fixed to the inner ring, and the brake disc is arranged coaxially with the output shaft.
In another alternative, a second installation space is formed inside the housing assembly, and the motor assembly is installed in the second installation space.
In another alternative, the mounting portion is formed with a plurality of sets of mounting holes penetrating in the axial direction, and the caliper mechanism is fixedly connected to the mounting portion via a connecting member penetrating any one of the plurality of sets of mounting holes.
In another alternative, the in-wheel motor drive system further includes a motor bearing between the motor shaft and the housing assembly and a support bearing between the output shaft and the mounting portion.
In another alternative, the knuckle further includes a fold portion extending from the mounting portion, a first pivot portion fixed to the fold portion, and a second pivot portion fixed to the mounting portion.
The application also provides a motor vehicle which comprises the hub motor driving system according to any one of the technical schemes.
In an alternative, the motor vehicle includes a wheel, the wheel bearing, the brake system and the mounting portion of the knuckle are located inside the wheel, and a portion of the bend portion of the knuckle extends outside the wheel.
In another alternative, the inner ring is fixed to the hub of the wheel.
Through adopting above-mentioned technical scheme, this application provides a novel in-wheel motor driving system and includes this in-wheel motor driving system's motor vehicle. The in-wheel motor drive system includes a knuckle, a drive mechanism, a wheel bearing, and a brake system. The knuckle includes a mounting portion to which the drive mechanism is detachably mounted. The driving mechanism comprises a motor assembly, a planetary gear speed reducing mechanism, a shell assembly and an output shaft. The motor assembly is always in transmission connection with the output shaft through the planetary gear speed reducing mechanism, and the output shaft penetrates through the mounting portion along the axial direction of the output shaft and can rotate relative to the mounting portion. The wheel bearing comprises an inner ring and an outer ring, the outer ring is detachably arranged on the mounting part, and the inner ring is always in transmission connection with the output shaft through a spline. The braking system comprises a braking disc and a braking clamp mechanism, wherein the braking disc is relatively fixed with the output shaft, and the braking clamp mechanism is detachably arranged on the mounting part. In the axial direction, the drive mechanism is located on one side of the mounting portion and the wheel bearing and braking system are located on the other side of the mounting portion.
In this way, with the knuckle as a reference, the brake system and the wheel bearing are located on the opposite side of the drive mechanism, the brake caliper mechanism of the brake system and the outer ring of the wheel bearing are detachably mounted on the knuckle, and the inner ring of the wheel bearing is in transmission connection with the output shaft of the drive system through the spline. The above structural design is beneficial to the adaptation and disassembly of the steering knuckle and other structures of the in-wheel motor driving system and the different braking systems and wheel bearings, that is to say, the in-wheel motor driving system according to the application can adapt to the wheels with the different braking systems and wheel bearings without structural adjustment. Thereby, the versatility of the in-wheel motor drive system of the present application is improved. Moreover, since the planetary gear reduction mechanism has the knuckle as a part of its housing, a part of the structure of the housing originally used as the planetary gear reduction mechanism is omitted, thereby enabling the in-wheel motor drive system of the present application to be reduced in axial length.
Drawings
Fig. 1 is a perspective view showing an assembly of an in-wheel motor driving system and a wheel according to an embodiment of the present application.
Fig. 2 is a schematic sectional view showing the assembly in fig. 1.
Fig. 3 is a schematic sectional view showing the in-wheel motor driving system in fig. 1, in which a brake system is omitted.
Fig. 4 is a perspective view showing a knuckle of the in-wheel motor drive system of fig. 1.
Fig. 5 is another perspective view showing a knuckle of the in-wheel motor drive system in fig. 1.
Fig. 6 is a schematic sectional view showing a partial structure of a driving mechanism of the in-wheel motor driving system in fig. 1.
Description of the reference numerals
WH wheel HU hub TI tire
DR wheel hub motor driving system
1 the first pivot portion 14 of the bending portion 13 of the first mounting hole 11h2, the second mounting hole 11h3, and the third mounting hole 12 of the through hole 11h1 of the mounting portion 11h of the knuckle 11
2 drive mechanism 21 motor assembly 211 stator 212 rotor 213 rotor support 214 motor shaft 22 planetary gear reduction mechanism 221 sun gear 222 planetary gear 223 planetary wheel carrier 224 gear ring 23 housing assembly 231 first housing 232 second housing 24 output shaft S1 first installation space S2 second installation space
Rolling element of inner ring 32 and outer ring 33 of 3-wheel bearing 31
4 brake system 41 brake disc
B1 motor bearing B2 support bearing
Aaxial R radial.
Detailed Description
Exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are merely illustrative of how one skilled in the art may practice the present application and are not intended to be exhaustive of all of the possible ways of practicing the present application nor to limit the scope of the present application.
In the present application, the output shaft of the in-wheel motor drive system is a solid shaft extending linearly. "axial," "radial," and "circumferential" refer to the axial, radial, and circumferential directions of the output shaft, respectively, unless otherwise specifically indicated. "axial one side" refers to the right side in fig. 2, 3 and 6, and "axial other side" refers to the left side in fig. 2, 3 and 6. "radially outer" refers to the side radially away from the central axis of the output shaft, and "radially inner" refers to the side radially closer to the central axis of the output shaft.
In this application, "drive coupling" refers to a torque-transmitting connection between two components, including direct and indirect connections.
The structure of an in-wheel motor driving system according to an embodiment of the present application is described below with reference to the drawings.
As shown in fig. 1 to 3, an in-wheel motor drive system DR according to an embodiment of the present application includes a knuckle 1, a drive mechanism 2, a wheel bearing 3, and a brake system 4 that are assembled together. The mounting portion 11 of the knuckle 1 is located inside the wheel WH and fitted over the output shaft 24 of the drive mechanism 2, the drive mechanism 2 is mounted to the mounting portion 11 on one axial side of the mounting portion 11, and the wheel bearing 3 and the brake system 4 are mounted to the mounting portion 11 on the other axial side of the mounting portion 11.
In the present embodiment, as shown in fig. 2 to 5, the knuckle 1 includes a mounting portion 11, a bent portion 12, a first pivot portion 13, and a second pivot portion 14 that are formed as one body.
Specifically, as shown in fig. 4 and 5, the mounting portion 11 is formed integrally in a substantially plate shape having one axial side surface perpendicular to the axial direction a and the other axial side surface. A through hole 11h penetrating in the axial direction is formed at the central portion of the mounting portion 11, and the output shaft 24 of the drive mechanism 2 is inserted through the through hole 11h. The through hole 11h may be formed as a stepped hole for mounting a support bearing B2 for supporting the output shaft 24. Around the through hole 11h, the mounting portion 11 is further formed with a first mounting hole 11h1 for mounting the drive mechanism 2, a second mounting hole 11h2 for mounting the outer race 32 of the wheel bearing 3, and a third mounting hole 11h3 for mounting the caliper mechanism of the brake system 4.
As shown in fig. 4 and 5, the first mounting holes 11h1 are through holes penetrating along the axial direction a, and the plurality of first mounting holes 11h1 are distributed along the circumferential direction. As shown in fig. 3, at least part of the first mounting hole 11h1 may be a stepped hole whose small diameter portion is open at one side face in the axial direction of the mounting portion 11 and whose large diameter portion is open at the other side face in the axial direction of the mounting portion 11. In this way, the connection piece inserted into the small diameter portion and the corresponding mounting hole of the housing assembly 23 of the driving mechanism 2 can be easily operated by the large diameter portion, so that the driving mechanism 2 is detachably mounted to the mounting portion 11.
As shown in fig. 5, the second mounting holes 11h2 are blind holes extending in the axial direction a, and the plurality of second mounting holes 11h2 are distributed in the circumferential direction. Each of the second mounting holes 11h2 is open at the other axial side of the mounting portion 11, and each of the second mounting holes 11h2 is closed at one axial side of the mounting portion 11. In this way, the outer race 32 of the wheel bearing 3 is detachably mounted to the mounting portion 11 by the coupling members inserted into the second mounting holes 11h2 and the corresponding mounting holes of the outer race 32 of the wheel bearing 3.
As shown in fig. 4 and 5, the third mounting hole 11h3 is a through hole penetrating in the axial direction. The plurality of third mounting holes 11h3 are divided into two groups, the first group of third mounting holes 11h3 being two third mounting holes 11h3 located on the left side in fig. 4 and the right side in fig. 5, and the second group of third mounting holes 11h3 being two third mounting holes 11h3 located on the right side in fig. 4 and the left side in fig. 5. The caliper mechanism of the brake system 4 can be detachably mounted to the mounting portion 11 by using any one of the third mounting holes 11h3, so that the flexibility of mounting the knuckle 1 and the caliper mechanism of the brake system 4 can be improved.
Further, as shown in fig. 4 and 5, the bent portion 12 protrudes from the mounting portion 11, and the bent portion 12 is formed by a plurality of bends. As shown in fig. 1 and 2, a part of the bending portion 12 is located inside the tire TI, and another part of the bending portion 12 extends to the outside of the tire TI up to the radially outer side of the tire TI. The first pivot portion 13 is fixed to a portion of the bending portion 12 located radially outward of the tire TI, and the second pivot portion 14 is fixed to a portion of the mounting portion 11 facing away from the bending portion 12. The knuckle 1 can be rotatably connected (constituting a cardan-like structure) to the suspension system of the motor vehicle by means of a first pivot point 13 and a second pivot point 14, so that the wheel WH can rotate about an axis defined by the first pivot point 13 and the second pivot point 14.
Further, as shown in fig. 2 and 3, the shape of the knuckle 1 is configured to match the second housing 232 of the housing assembly 23 of the drive mechanism 2, so that the knuckle 1 is a part of the housing of the planetary gear reduction mechanism 22, that is, the planetary gear reduction mechanism 22 is mounted in the first mounting space S1 surrounded by the knuckle 1 and the second housing 232.
In the present embodiment, as shown in fig. 2, 3 and 6, the drive mechanism 2 is detachably mounted to the mounting portion 11, and includes a motor assembly 21, a planetary gear reduction mechanism 22, a housing assembly 23 and an output shaft 24. The motor assembly 21 is always in driving connection with the output shaft 24 via the planetary gear reduction mechanism 22, and the output shaft 24 passes through the mounting portion 11 of the knuckle 1 in the axial direction a and is rotatable relative to the mounting portion 11.
Specifically, as shown in fig. 2 and 3, the motor assembly 21 is integrally mounted in the second mounting space S2 defined by the housing assembly 23. The motor assembly 21 includes a stator 211, a rotor 212, a rotor support 213, and a motor shaft 214. The stator 211 is fixed to the housing assembly 23, and a cooling jacket may be provided between the stator 211 and the housing assembly 23 for reducing the temperature of the stator 211 during operation of the motor assembly 21. The rotor 212 is located radially inside the stator 211 and opposite to the stator 211 in the radial direction R, and the rotor 212 is rotatable relative to the stator 211. The rotor bracket 213 is located radially inside the rotor 212 and is fixed with the rotor 212, and the rotor bracket 213 is also fixed with the motor shaft 214 such that the rotor 212 and the motor shaft 214 are drivingly coupled via the rotor bracket 213.
As shown in fig. 3, the planetary gear reduction mechanism 22 is located in the first installation space S1 surrounded by the housing assembly 23 and the mounting portion 11. The planetary gear reduction mechanism 22 includes a sun gear 221, a planetary gear 222, a planetary carrier 223, and a ring gear 224. In the present embodiment, one end of the motor shaft 214 of the motor assembly 21 is formed with gear teeth to constitute the sun gear 221 of the planetary gear reduction mechanism 22, that is, the sun gear 221 is formed integrally with the motor shaft 214. A plurality of planetary gears 222 are located radially outside the sun gear 221 and uniformly distributed along the circumferential direction, each planetary gear 222 is tooth-engaged with the sun gear 221, so that each planetary gear 222 can perform rotation about the respective central axis and revolution about the sun gear 221 with rotation of the sun gear 221. The carrier 223 is located radially outward of the sun gear 221, and a plurality of planetary gears 222 are mounted to the carrier 223, the carrier 223 being fixed to the output shaft 24. As the planetary gears 222 revolve, the planetary gear carrier 223 can be driven to rotate, so that the output shaft 24 is driven to rotate. The ring gear 224 is located radially outward of the plurality of planetary gears 222 and fixed to the knuckle 1, and a orbit for the plurality of planetary gears 222 to revolve is formed between the ring gear 224 and the sun gear 221, and the ring gear 224 is tooth-engaged with the plurality of planetary gears 222.
In the present embodiment, as shown in fig. 2, 3 and 6, the housing assembly 23 includes a first housing 231 and a second housing 232. The second housing 232 may be fixed to the mounting portion 11 of the knuckle 1 by interference fit, and the corresponding structure of the second housing 232 and the mounting portion 11 of the knuckle 1 encloses a first mounting space S1 in which the planetary gear reduction mechanism 22 is mounted. The first housing 231 is detachably mounted to the knuckle 1 using the first mounting hole 11h 1. In addition, a second installation space S2 is formed inside the first housing 231, and other components of the motor assembly 21 except for the motor shaft 214 are installed in the second installation space S2. In addition, the motor shaft 214 extends from the second installation space S2 into the first installation space S1, and the output shaft 24 extends from the first installation space S1 to the other axial side of the knuckle 1 through the through hole 11h of the knuckle 1. In the present embodiment, as shown in fig. 2, 3 and 6, the output shaft 24 is arranged coaxially with the motor shaft 214, whereby the entire drive mechanism 2 has a coaxial structural layout.
In the present embodiment, as shown in fig. 2 and 3, the wheel bearing 3 includes an inner ring 31, an outer ring 32, and rolling bodies 33. The outer race 32 is detachably attached to the mounting portion 11 by the second mounting hole 11h2 of the knuckle 1. The inner race 31 is coupled to the output shaft 24 by a spline drive. When the inner ring 31 and the outer ring 32 are rotated relatively, the rolling bodies 33 can roll in the raceways of the outer ring 32 and the inner ring 31. In this embodiment, the wheel bearing 3 may be a double row ball bearing.
In the present embodiment, as shown in fig. 1 to 3, the brake system 4 is a floating caliper disc brake system. The brake system includes a brake caliper mechanism (including a brake caliper, a brake cylinder, etc.) and a brake disc 41. The caliper mechanism of the brake system 4 is detachably mounted to the mounting portion 11 by any one of the third mounting holes 11h3 of the knuckle 1. The brake disc 41 of the brake system 4 is fixed to the inner ring 31 so as to be fixed to the output shaft 24, and the brake disc 41 is arranged coaxially with the output shaft 24. Thus, by the movement of the piston in the brake cylinder, the floating caliper can be driven to clamp the brake disc 41, and further, a friction torque for preventing the wheel WH from rotating is generated, thereby realizing braking.
In the present embodiment, in order to ensure the normal operation of the motor shaft 214 and the output shaft 24, the in-wheel motor driving system DR includes two motor bearings B1 and one support bearing B2. Two motor bearings B1 are located between the first housing 231 and the motor shaft 214. A support bearing B2 is located between the mounting portion 11 of the knuckle 1 and the output shaft 24.
The present application also provides a motor vehicle comprising an in-wheel motor drive system DR as described above, which may in particular be an electric vehicle with more than two wheels. In an alternative example of a motor vehicle according to the present application, the motor vehicle includes four wheels WH, to which the in-wheel motor drive system DR is mounted. As shown in fig. 1 and 2, the wheel bearing 3 of the in-wheel motor drive system DR, the brake system 4, and the mounting portion 11 of the knuckle 1 are located inside the wheel WH, and a portion of the bent portion 12 of the knuckle 1 extends outside the wheel WH. In addition, the driving mechanism 2 may be located outside the wheel WH. In order to transmit torque from the drive mechanism 2 to the wheel WH, the inner race 31 is fixed to the hub HU of the wheel WH. In this way, the transmission path of the torque from the motor of the driving mechanism 2 is as follows: rotor 212, rotor support 213, motor shaft 214, sun gear 221, planet gears 222, planet gear carrier 223, output shaft 24, inner ring 31 and wheels WH.
The present application is not limited to the above-described embodiments, and various modifications may be made to the above-described embodiments of the present application by those skilled in the art under the teachings of the present application without departing from the scope of the present application. The following description is also made.
i. By adopting the above-mentioned construction, on the one hand, taking knuckle 1 as the benchmark, braking system 4 and wheel bearing 3 are located the opposite side of actuating mechanism 2 place side, and braking system 4 and wheel bearing 3 detachably install in knuckle 1, and wheel bearing 3's inner circle 31 passes through spline transmission with actuating system's output shaft 24 and connects, and above structure all is favorable to the knuckle 1 etc. part of in-wheel motor actuating system DR of this application to adapt and dismouting with different braking system 4 and wheel bearing 3, and from this, the commonality of in-wheel motor actuating system DR of this application has obtained the improvement. Moreover, since the planetary gear reduction mechanism 22 has the knuckle 1 as a part of its housing, the housing that was originally used as the planetary gear reduction mechanism 22 is omitted or simplified, thereby enabling the in-wheel motor drive system DR of the present application to be reduced in axial length.
On the other hand, torque can be caused to be transmitted from the in-wheel motor drive system DR to the output shaft 24 to drive the hub HU, thereby finally driving the wheels WH. In this way, the motor directly drives the wheels WH of the motor vehicle without the conventional transmission and drive shaft located outside the wheels WH, thus shortening the torque transmission path compared to prior art motor vehicle drive systems, so that the efficiency of the drive system is improved and the energy loss during transmission is reduced. Moreover, the coaxial arrangement of the drive mechanism 2, the wheel bearing 3 and the brake disc 41 allows to save space occupied and the in-wheel motor drive system DR is integrated with the wheel WH, which facilitates the structural layout of the motor vehicle and reduces the effects of spatial interference in case of jolting and turning of the motor vehicle.
it will be appreciated that seal assemblies may be provided as required between the first housing 231 and the motor shaft 214, between the knuckle 1 and the output shaft 24, and between the inner race 31 and the outer race 32 of the wheel bearing 3.
in the above embodiment, the sun gear 221 of the planetary gear reduction mechanism 22 is formed integrally with the motor shaft 214, which is advantageous in simplifying the structure and reducing the cost. In other alternatives, the sun gear 221 and the motor shaft 214 may be separately manufactured components, and then drivingly coupled by interference, form fit, keyed or splined engagement, or the like.

Claims (10)

1. An in-wheel motor drive system, characterized in that the in-wheel motor drive system (DR) comprises:
a knuckle (1), the knuckle (1) comprising a mounting portion (11);
the driving mechanism (2) is detachably mounted on the mounting part (11), and comprises a motor assembly (21), a planetary gear speed reducing mechanism (22), a shell assembly (23) and an output shaft (24), wherein the motor assembly (21) and the output shaft (24) are always in transmission connection through the planetary gear speed reducing mechanism (22), the output shaft (24) penetrates through the mounting part (11) along the axial direction (A) and can rotate relative to the mounting part (11), and the planetary gear speed reducing mechanism (22) is positioned in a first mounting space (S1) surrounded by the shell assembly (23) and the mounting part (11);
the wheel bearing (3), the wheel bearing (3) comprises an inner ring (31) and an outer ring (32), the outer ring (32) is detachably arranged on the mounting part (11), and the inner ring (31) is in spline transmission connection with the output shaft (24); and
a brake system (4), the brake system (4) comprising a brake disc (41) and a brake caliper mechanism, the brake disc (41) and the output shaft (24) being relatively fixed, the brake caliper mechanism being detachably mounted to the mounting portion (11),
in the axial direction (A), the drive mechanism (2) is located on one side of the mounting (11), and the wheel bearing (3) and the brake system (4) are located on the other side of the mounting (11).
2. The in-wheel motor drive system according to claim 1, wherein the drive mechanism (2) includes a stator (211), a rotor (212), and a motor shaft (214), the planetary gear reduction mechanism includes a sun gear (221), a planetary gear (222), a planetary carrier (223), and a ring gear (224),
the rotor (212) can rotate relative to the stator (211), the rotor (212) is in transmission connection with the sun gear (221) via the motor shaft (214), the output shaft (24) is in transmission connection with the planet wheel carrier (223), the gear ring (224) is fixed with the mounting part (11),
the motor shaft (214) is arranged coaxially with the output shaft (24).
3. In-wheel motor drive system according to claim 1, characterized in that the brake disc (41) is fixed with the inner ring (31), the brake disc (41) being arranged coaxially with the output shaft (24).
4. A wheel hub motor drive system according to any one of claims 1-3, characterized in that a second installation space (S2) is formed inside the housing assembly (23), the motor assembly (21) being installed in the second installation space (S2).
5. A wheel hub motor drive system according to any one of claims 1 to 3, wherein the mounting portion (11) is formed with a plurality of sets of mounting holes (11 h 3) penetrating along the axial direction (a), and the caliper mechanism is fixedly connected to the mounting portion (11) via a connection member penetrating any one of the plurality of sets of mounting holes (11 h 3).
6. The in-wheel motor drive system according to claim 2, characterized in that the in-wheel motor drive system (DR) further comprises a motor bearing (B1) and a support bearing (B2), the motor bearing (B1) being located between the motor shaft (214) and the housing assembly (23), the support bearing (B2) being located between the output shaft (24) and the mounting portion (11).
7. A wheel hub motor drive system according to any one of claims 1-3, characterized in that the steering knuckle (1) further comprises a bending part (12), a first pivot part (13) and a second pivot part (14), the bending part (12) protruding from the mounting part (11), the first pivot part (13) being fixed with the bending part (12), the second pivot part (14) being fixed with the mounting part (11).
8. A motor vehicle, characterized in that it comprises an in-wheel motor drive system (DR) according to any one of claims 1 to 7.
9. Motor vehicle according to claim 8, characterized in that it comprises a Wheel (WH), the wheel bearing (3), the brake system (4) and the mounting (11) of the knuckle (1) being located inside the Wheel (WH), a portion of the bend (12) of the knuckle (1) extending outside the Wheel (WH).
10. Motor vehicle according to claim 8 or 9, characterized in that the inner ring (31) is fixed to the hub of the Wheel (WH).
CN202210004516.8A 2022-01-05 2022-01-05 In-wheel motor driving system and motor vehicle Pending CN116409138A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210004516.8A CN116409138A (en) 2022-01-05 2022-01-05 In-wheel motor driving system and motor vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210004516.8A CN116409138A (en) 2022-01-05 2022-01-05 In-wheel motor driving system and motor vehicle

Publications (1)

Publication Number Publication Date
CN116409138A true CN116409138A (en) 2023-07-11

Family

ID=87057000

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210004516.8A Pending CN116409138A (en) 2022-01-05 2022-01-05 In-wheel motor driving system and motor vehicle

Country Status (1)

Country Link
CN (1) CN116409138A (en)

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