Hub driving system and vehicle

Abstract

The invention provides a hub driving system and a vehicle, the hub driving system comprises a rim (1), the rim (1) comprises an inner rim (11) and an outer rim (12), and the inner rim (11) and the outer rim (12) are connected together side by side; the driving module (2) comprises a motor (21) and a speed reducer (22), the output end of the motor (21) is connected to the input end of the speed reducer (22), and the driving module (2) is arranged in the outer rim (12); a hub module (3), the hub module (3) comprising a hub shaft (31) and a flange (34), the flange (34) being rotatably connected to the hub shaft (31) relative to the hub shaft (31), the hub shaft (31) supporting a motor rotor (213) of the motor (21) and the flange (34); and the brake module (4) is arranged in the inner rim (11).

Description

Technical Field

[0001] The present application relates to a wheel hub drive system and a vehicle. Background Art

[0002] The existing wheel hub drive system of heavy-duty vehicles includes a central drive motor of a clutch and a multi-speed transmission. The transmission chain of this central motor drive system is very long, so the power loss is high, the transmission efficiency is low, and the overall weight is heavy.

[0003] CN102139628A and CN102139629A disclose a wheel-side drive axle, in which the drive motor and the brake are located axially inward of the wheel, which will occupy the area where the vehicle body is arranged and affect the space inside the vehicle. Summary of the invention

[0004] The present application aims to propose a wheel hub drive system to alleviate or avoid the impact of the wheel hub drive system on the vehicle suspension and body.

[0005] The embodiment of the present application provides a wheel hub drive system, comprising:

[0006] A rim, the rim comprising an inner rim and an outer rim, the inner rim and the outer rim being connected side by side;

[0007] A driving module, the driving module comprising a motor and a reducer, the output end of the motor is connected to the input end of the reducer, and the driving module is arranged inside the outer rim;

[0008] a wheel hub module, the wheel hub module comprising a wheel hub shaft and a flange, the flange being rotatably connected to the wheel hub shaft relative to the wheel hub shaft, the wheel hub shaft supporting a motor rotor of the motor and the flange; and

[0009] A brake module is arranged inside the inner rim.

[0010] In at least one possible implementation manner, the hub shaft is provided with an axial hole, and the axial hole is a through hole.

[0011] In at least one possible implementation, the reducer is a single-stage planetary gear reducer or a multi-stage planetary gear reducer.

[0012] In at least one possible implementation, the motor is a dual-rotor axial flux motor, and the reducer is located on the axial side of the dual-rotor axial flux motor.

[0013] In at least one possible implementation manner, the motor is a radial flux motor, and the reducer includes a first planetary gear unit and a second planetary gear unit, wherein the first planetary gear unit is at least partially located radially inside the radial flux motor.

[0014] In at least one possible implementation, the motor is a radial flux motor, the reducer includes planetary gears, the planetary gears are double-row gears, and the gears of the reducer are at least partially located radially inside the radial flux motor.

[0015] In at least one possible implementation manner, the reducer is located on an axial side of the motor close to the brake module, and an output end of the reducer is directly connected to the flange; or

[0016] The reducer is located on an axial side of the motor away from the brake module, and an output end of the reducer is connected to the flange via an output ring.

[0017] In at least one possible implementation, the motor includes a rotor axial support bearing, which is arranged on one axial side or both axial sides of the motor rotor or the motor rotor frame of the motor to bear the axial load from the reducer.

[0018] In at least one possible implementation manner, the brake module includes a brake caliper, the wheel hub shaft is provided with a plate-shaped brake caliper connecting portion, and the brake caliper is mounted on the brake caliper connecting portion.

[0019] An embodiment of the present application further proposes a vehicle, comprising a wheel hub drive system according to any one of the above embodiments, wherein when the wheel hub drive system is installed on the vehicle, the inner wheel rim is located on the inner side of the outer wheel rim in the vehicle width direction.

[0020] By adopting the above technical solution, the wheel hub drive system of the present application can obtain at least one of the following beneficial effects.

[0021] (1) The drive module is disposed inside the outer rim, and even if the drive module is large in size, it will not affect the suspension and the vehicle body.

[0022] (2) The planetary gear reducer has a large reduction ratio and a small size, which enables the hub drive system to have a higher torque density.

[0023] (3) The output end of the drive module is directly connected to the wheel hub module, the transmission chain is short, and the power transmission efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of a wheel hub drive system according to a first embodiment of the present application is shown.

[0025] Figure 2 Another schematic structural diagram of the wheel hub drive system according to the first embodiment of the present application is shown.

[0026] Figure 3 A schematic structural diagram of a hub shaft of a hub drive system according to a first embodiment of the present application is shown.

[0027] Figure 4 A schematic structural diagram of a wheel hub drive system according to a second embodiment of the present application is shown.

[0028] Figure 5 A schematic structural diagram of a wheel hub drive system according to a third embodiment of the present application is shown.

[0029] Figure 6 A schematic diagram showing the structure of a hub shaft of a wheel hub drive system according to a third embodiment of the present application.

[0030] Figure 7 A schematic structural diagram of a wheel hub drive system according to a fourth embodiment of the present application is shown.

[0031] Description of Reference Numerals

[0032] 1 Rim

[0033] 11 inner rim 111 inner rim side wall portion 112 inner rim peripheral wall portion

[0034] 12 outer rim 121 outer rim side wall portion 122 outer rim peripheral wall portion

[0035] 13 Rim connecting bolt 14 Rim connecting nut

[0036] 2 Driver Module

[0037] 21 motor 211 housing 212 motor stator 213 motor rotor 214 rotor axial support bearing 215 motor rotor frame 216 nut 217 rotor radial support bearing 218 end cover 219 rotor frame bearing

[0038] 22 reducer 221 sun gear 222 planetary wheel carrier support bearing 223 planetary wheel 224 ring gear 225 planetary wheel carrier 226 reducer end cover 227 output ring 228 output ring locking nut

[0039] 22A first planetary gear unit 221A first sun gear 222A first planetary carrier support bearing 223A first planetary gear 224A first ring gear 225A first planetary carrier

[0040] 22B Second planetary gear unit 221B Second sun gear 222B Second planetary carrier support bearing 223B Second planetary gear 224B Second ring gear 225B Second planetary carrier

[0041] 3 wheel hub module 31 wheel hub shaft 311 brake caliper connection portion 312 wheel bearing support portion 313 rotor radial support bearing support portion 314 threaded portion 315 shaft hole

[0042] 32 wheel bearing 33 wheel bearing preload nut 34 flange

[0043] 4 Brake module 41 Brake caliper 42 Parking brake motor 43 Brake disc 44 Brake disc bolt

[0044] A axial R radial DETAILED DESCRIPTION

[0045] In order to more clearly explain the above-mentioned purposes, features and advantages of the present application, the specific implementation methods of the present application are described in detail in this section in conjunction with the accompanying drawings. In addition to the various implementation methods described in this section, the present application can also be implemented in other different ways. Without violating the spirit of the present application, those skilled in the art can make corresponding improvements, deformations and substitutions, so the present application is not limited by the specific embodiments disclosed in this section. The scope of protection of the present application shall be subject to the claims.

[0046] (First Embodiment)

[0047] like Figures 1 to 3 As shown, the first embodiment of the present application proposes a wheel hub drive system, which includes a wheel rim 1, a drive module 2, a wheel hub module 3 and a brake module 4. The drive module 2, the wheel hub module 3 and the brake module 4 are arranged inside the wheel rim 1, or in the radial inner space of the wheel rim 1.

[0048] The wheel hub drive system can be used in electric vehicles, and is particularly suitable for heavy-load vehicles such as those whose rear axles are double-row wheels. The wheel hub drive system can have the characteristics of high rotation speed and high torque.

[0049] The rim 1 includes an inner rim 11 and an outer rim 12, and tires can be mounted on the inner rim 11 and the outer rim 12. Here, the inner rim 11 is located inside the outer rim 12 in the vehicle width direction.

[0050] like Figure 1As shown, the inner rim 11 includes an inner rim sidewall portion 111 and an inner rim peripheral wall portion 112, wherein the inner rim sidewall portion 111 extends along the radial direction R and the circumferential direction of the inner rim, and the inner rim peripheral wall portion 112 extends along the axial direction A and the circumferential direction of the inner rim. The outer rim 12 includes an outer rim sidewall portion 121 and an outer rim peripheral wall portion 122, wherein the outer rim sidewall portion 121 extends along the radial direction R and the circumferential direction of the outer rim, and the outer rim peripheral wall portion 122 extends along the axial direction A and the circumferential direction of the outer rim. The inner rim sidewall portion 111 and the outer rim sidewall portion 121 may be connected together by fasteners, for example, the fasteners may include a rim connection bolt 13 and a rim connection nut 14.

[0051] The driving module 2 may be disposed on the radially inner side of the outer rim peripheral wall portion 122 , and the braking module 4 may be disposed on the radially inner side of the inner rim peripheral wall portion 112 .

[0052] like Figure 2 As shown, the drive module 2 includes a motor 21 and a reducer 22 , the input end of the reducer 22 is connected to the output end of the motor 21 , and the reducer 22 can transmit the power and torque of the motor 21 to the flange 34 of the hub module 3 .

[0053] The motor 21 includes a housing 211 , a motor stator 212 , a motor rotor 213 , a rotor axial support bearing 214 , a motor rotor frame 215 , a nut 216 , a rotor radial support bearing 217 and an end cover 218 .

[0054] The motor stator 212 is installed inside the housing 211, and the motor rotor 213 is connected to the motor rotor frame 215. The motor rotor frame 215 is a hollow shaft, and the motor rotor frame 215 is sleeved on the hub shaft 31 of the hub module 3. The rotor radial support bearing 217 is sleeved on the hub shaft 31, and the rotor radial support bearing 217 is located in the radial gap between the motor rotor frame 215 and the hub shaft 31. Two motor rotors 213 can be provided, and the two motor rotors 213 are respectively located on both sides of the axial direction of the motor stator 212. Therefore, the motor in this embodiment can be a single-stator dual-rotor axial flux motor.

[0055] Two rotor axial support bearings 214 may be provided, and the two rotor axial support bearings 214 are located in the axial gap between the motor stator 212 and the motor rotor 213. The rotor axial support bearings 214 can leave an air gap between the motor stator 212 and the motor rotor 213, and bear the axial load from the reducer 22.

[0056] The nut 216 is connected to the hub shaft 31 of the hub module 3 so that the hub shaft 31 is installed on the housing 211 to achieve axial relative positioning of the two.

[0057] The housing 211 can be used to accommodate the motor stator 212, motor rotor 213 and other components of the motor and the gears and other components of the reducer. The housing 211 can serve as a common housing for the motor and the reducer, or it can be said that the motor and the reducer are integrated, and the drive module 2 can be called a reduction motor.

[0058] The reducer 22 is located on the axial side of the motor 21 close to the brake module 4, and the output end of the reducer 22 is directly connected to the flange 34, so that the power and torque are directly transmitted to the flange 34, which is more efficient.

[0059] The reducer 22 may be a planetary gear reducer, and the reducer 22 includes a sun gear 221 , a planetary wheel carrier support bearing 222 , planetary wheels 223 , a ring gear 224 , a planetary wheel carrier 225 and a reducer end cover 226 .

[0060] The sun gear 221 is connected to the motor rotor frame 215, so that the motor 21 can drive the sun gear 221 to rotate. Two planetary wheel carrier support bearings 222 can be provided, and the two planetary wheel carrier support bearings 222 respectively support the axial ends of the planetary wheel carrier 225. One planetary wheel carrier support bearing 222 is provided between the planetary wheel carrier 225 and the motor housing 211, and the other planetary wheel carrier support bearing 222 is provided between the planetary wheel carrier 225 and the reducer end cover 226, so that the planetary wheel carrier 225 can rotate relative to the motor housing 211.

[0061] The ring gear 224 is fixedly connected to the motor housing 211 , and the planetary gear 223 is rotatably connected to the planetary gear carrier 225 relative to the planetary gear carrier 225 . The planetary gear 223 is located radially outside the sun gear 221 and radially inside the ring gear 224 , and the planetary gear 223 is meshed with both the sun gear 221 and the ring gear 224 .

[0062] The reducer end cover 226 can be connected to the end of the motor housing 211 ( Figure 2 on the right side of the image).

[0063] like Figure 2 and Figure 3 As shown, the wheel hub module 3 includes a wheel hub shaft 31 , a wheel bearing 32 , a wheel bearing preload nut 33 and a flange 34 .

[0064] The hub shaft 31 is inserted into the motor rotor frame 215, and the flange 34 can be sleeved on the hub shaft 31. The flange 34 can be connected to the rim 1 through fasteners, for example, the fasteners can include rim connection bolts 13 and rim connection nuts 14. The planetary wheel carrier 225 can be connected to the flange 34, and the wheel bearing 32 is sleeved on the hub shaft 31. The wheel bearing 32 is located in the radial gap between the hub shaft 31 and the flange 34. The wheel bearing pre-tightening nut 33 can be installed on the hub shaft 31, and the wheel bearing pre-tightening nut 33 is located on one axial side of the wheel bearing 32 ( Figure 2on the left side of the image).

[0065] The hub shaft 31 includes a brake caliper connection portion 311, a wheel bearing support portion 312, a rotor radial support bearing support portion 313, a threaded portion 314, and an axial hole 315. In the present embodiment, the axial hole 315 may be a through hole, however, the present application is not limited thereto.

[0066] The hub shaft 31 is a hollow shaft provided with an axial hole 315, and a cable and / or a coolant pipe can pass through the axial hole 315. The diameters of the wheel bearing support portion 312, the rotor radial support bearing support portion 313 and the threaded portion 314 decrease in sequence.

[0067] The brake caliper connection part 311 may be plate-shaped and is formed at the axial end of the hub shaft 31. The brake caliper connection part 311 is provided with a mounting hole for mounting the brake caliper 41. The wheel bearing support part 312 is used to support the wheel bearing 32, the rotor radial support bearing support part 313 is used to support the rotor radial support bearing 217, and the threaded part 314 and the nut 216 cooperate to fix the hub shaft 31.

[0068] The power transmission path driven by the motor is: motor rotor 213 - sun gear 221 - planetary gear 223 - planetary wheel carrier 225 - flange 34 - rim 1. When the vehicle brakes, the power can be transmitted to the motor in the reverse direction for the motor's braking energy recovery.

[0069] like Figure 2 As shown, the brake module 4 includes a brake caliper 41 , a parking brake motor 42 , a brake disc 43 and a brake disc bolt 44 .

[0070] The brake disc 43 is connected to the flange 34 via brake disc bolts 44 , the brake caliper 41 can be connected to the wheel hub shaft 31 , or the brake caliper 41 can be connected to the vehicle suspension, and the parking brake motor 42 can drive the brake caliper 41 to move.

[0071] The embodiment of the present application also provides a vehicle, which includes the above-mentioned wheel hub drive system, and when the wheel hub drive system is installed on the vehicle, the inner wheel rim 11 is located on the inner side of the outer wheel rim 12 in the vehicle width direction, and the inner wheel rim 11 is closer to the vehicle body or vehicle body than the outer wheel rim 12. Even if the power of the motor 21 is large, resulting in a large size of the drive module 2, the drive module will not affect the suspension structure of the vehicle.

[0072] The above-mentioned wheel hub drive system has the following beneficial effects.

[0073] (1) The drive module 2 is disposed on the outer rim, so that even if the drive module 2 is large in size, it will not affect the suspension and the vehicle body.

[0074] (2) The planetary gear reducer has a large reduction ratio and a small size, which enables the hub drive system to have a higher torque density.

[0075] (3) The output end of the drive module 2 is directly connected to the wheel hub module, the transmission chain is short, and the power transmission efficiency is high.

[0076] (Second Embodiment)

[0077] like Figure 4 As shown, the second embodiment of the present application proposes a wheel hub drive system, which includes a wheel rim 1, a drive module 2, a wheel hub module 3 and a brake module 4. The same reference numerals are used to represent the same or similar structures in the wheel hub drive system of the second embodiment as those in the wheel hub drive system of the first embodiment.

[0078] The wheel hub drive system of the second embodiment differs from the wheel hub drive system of the first embodiment in that the drive module 2 is included.

[0079] The driving module 2 includes a motor 21 and a reducer 22 .

[0080] The motor 21 includes a housing 211, a motor stator 212, a motor rotor 213, a rotor axial support bearing 214, a motor rotor frame 215, a nut 216, a rotor radial support bearing 217 and an end cover 218. The motor rotor 213 is located radially inside the motor stator 212. Two rotor axial support bearings 214 can be provided, and the two rotor axial support bearings 214 are located on both axial sides of the motor rotor frame 215. The rotor axial support bearings 214 can bear the axial load from the reducer 22. The rotor radial support bearing 217 is sleeved on the hub shaft 31, and the rotor radial support bearing 217 is located in the radial gap between the first sun gear 221A and the hub shaft 31.

[0081] The reducer 22 may be a multi-stage planetary gear reducer, and the reducer 22 includes a first planetary gear unit 22A, a second planetary gear unit 22B, and a reducer end cover 226 .

[0082] The first planetary gear unit 22A includes a first sun gear 221A, a first planet carrier support bearing 222A, a first planet gear 223A, a first ring gear 224A, and a first planet carrier 225A.

[0083] The first sun gear 221A is connected to the motor rotor frame 215, so that the motor 21 can drive the first sun gear 221A to rotate. Two first planetary wheel carrier support bearings 222A can be provided, and the two first planetary wheel carrier support bearings 222A are respectively provided at the axial ends of the first planetary wheel carrier 225A. One first planetary wheel carrier support bearing 222A is provided between the first planetary wheel carrier 225A and the motor housing 211, so that the first planetary wheel carrier 225A can rotate relative to the motor housing 211. Another first planetary wheel carrier support bearing 222A can be provided between the first planetary wheel carrier 225A and the second planetary wheel carrier 225B.

[0084] The first ring gear 224A is fixedly connected to the motor housing 211, and the first planetary gear 223A is rotatably connected to the first planetary gear carrier 225A relative to the first planetary gear carrier 225A. The first planetary gear 223A is located radially outside the first sun gear 221A and radially inside the first ring gear 224A, and the first planetary gear 223A is meshed with both the first sun gear 221A and the first ring gear 224A.

[0085] The second planetary gear unit 22B includes a second sun gear 221B, a second planet carrier support bearing 222B, second planet gears 223B, a second ring gear 224B, and a second planet carrier 225B.

[0086] The second sun gear 221B can be connected to the first planetary gear carrier 225A of the first planetary gear unit 22A, and the second planetary gear carrier support bearing 222B can be arranged between the second planetary gear carrier 225B and the reducer end cover 226, so that the second planetary gear carrier 225B can rotate relative to the reducer end cover 226. The second ring gear 224B is fixedly connected to the motor housing 211, and the second planetary gear 223B can be rotatably connected to the second planetary gear carrier 225B relative to the second planetary gear carrier 225B. The second planetary gear 223B is located on the radial outer side of the second sun gear 221B and on the radial inner side of the second ring gear 224B. The second planetary gear 223B is meshed with both the second sun gear 221B and the second ring gear 224B. The second planetary gear carrier 225B is connected to the flange 34 of the hub module 3.

[0087] In this embodiment, the reducer 22 is a multi-stage planetary gear reducer, and the reducer 22 includes a first planetary gear unit 22A and a second planetary gear unit 22B, so that a larger transmission ratio (reduction ratio) can be provided, which is conducive to providing a larger torque. The first planetary gear unit 22A is at least partially located on the radial inner side of the motor 21 as a radial flux motor, that is, the stator and / or rotor of the motor 21 and the first planetary gear unit 22A at least partially overlap in the axial direction A (occupy the same axial position), so that the axial size of the hub drive system can be reduced while ensuring the torque of the hub drive system.

[0088] (Third Embodiment)

[0089] like Figure 5 and Figure 6 As shown, the third embodiment of the present application proposes a wheel hub drive system, which includes a wheel rim 1, a drive module 2, a wheel hub module 3 and a brake module 4. The same reference numerals are used to represent the same or similar structures in the wheel hub drive system of the third embodiment as those in the wheel hub drive system of the first embodiment.

[0090] The wheel hub drive system of the third embodiment differs from the wheel hub drive system of the first embodiment in that the drive module 2 and the wheel hub module 3 are included.

[0091] The driving module 2 includes a motor 21 and a reducer 22 .

[0092] The motor 21 includes a housing 211, a motor stator 212, a motor rotor 213, a rotor axial support bearing 214, a motor rotor frame 215, a rotor radial support bearing 217 and a rotor frame bearing 219. Two motor rotors 213 may be provided, and the two motor rotors 213 are respectively located on both sides of the axial direction of the motor stator 212. The rotor frame bearing 219 is provided in the radial gap between the rotor frame 215 and the housing 211, and the rotor frame bearing 219 is used to support the rotor frame 215 so that the rotor frame 215 can rotate relative to the housing 211.

[0093] Compared with the wheel hub drive system of the first embodiment, the wheel hub drive system of the third embodiment does not have the nut 216 and the end cover 218 , and the wheel hub shaft 31 is mounted on the housing 211 by the pre-tightening nut 33 to achieve axial relative positioning between the wheel hub shaft 31 and the housing 211 .

[0094] The reducer 22 includes a sun gear 221, a planetary gear 223, a gear ring 224, a planetary gear carrier 225, an output ring 227 and an output ring locking nut 228. The reducer 22 can be located on the axial side of the motor 21 away from the brake module 4 ( Figure 5 The output end of the reducer 22 and the flange 34 are connected via an output ring 227. The planetary carrier 225 is connected to the output ring 227, and the output ring 227 is mounted on the flange 34 via an output ring locking nut 228, so that the planetary carrier 225 and the output ring 227 can rotate relative to the housing 211. Here, the planetary carrier 225 and the output ring 227 can form a housing that surrounds the motor 21 and the gears of the reducer 22.

[0095] The wheel hub module 3 includes a brake caliper connecting portion 311 , a wheel bearing supporting portion 312 , a rotor radial support bearing supporting portion 313 , and a threaded portion 314 .

[0096] The diameter of the wheel bearing support portion 312 is greater than the diameter of the rotor radial support bearing support portion 313, and the threaded portion 314 can be provided at a portion of the wheel bearing support portion 312 close to the rotor radial support bearing support portion 313. The wheel bearing support portion 312 is used to support the wheel bearing 32, and the rotor radial support bearing support portion 313 is used to support the rotor radial support bearing 217. The threaded portion 314 cooperates with the pre-tightening nut 33 to mount the hub shaft 31 on the housing 211.

[0097] (Fourth Embodiment)

[0098] like Figure 7 As shown, the fourth embodiment of the present application proposes a wheel hub drive system, which includes a wheel rim 1, a drive module 2, a wheel hub module 3 and a brake module 4. The same figure marks are used to represent the same or similar structures in the wheel hub drive system of the fourth embodiment as those in the wheel hub drive system of the third embodiment.

[0099] The wheel hub drive system of the fourth embodiment differs from the wheel hub drive system of the third embodiment in that the drive module 2 is included.

[0100] The motor rotor 213 is located radially inside the motor stator 212. The rotor frame bearing 219 can be disposed in the radial gap between the motor rotor frame 215 and the housing 211. The rotor frame bearing 219 is used to support the rotor frame 215 so that the rotor frame 215 can rotate relative to the housing 211. The rotor radial support bearing 217 is sleeved on the hub shaft 31. The rotor radial support bearing 217 is located in the radial gap between the motor rotor frame 215 and the hub shaft 31.

[0101] The reducer 22 includes a sun gear 221, a planetary gear 223, a ring gear 224, a planetary gear carrier 225, an output ring 227 and an output ring locking nut 228. The planetary gear 223 can be a double-row gear, and the planetary gear 223 can include a large gear and a small gear, the small gear and the large gear are coaxially arranged and fixedly connected, the diameter of the small gear is smaller than the diameter of the large gear, the small gear is meshed with the ring gear 224, and the large gear is meshed with the sun gear 221. By arranging the planetary gear 223 in the form of a double-row gear, a larger transmission ratio (reduction ratio) can be provided. The planetary gear carrier 225 is connected to the output ring 227, and the output ring 227 is installed on the flange 34 through the output ring locking nut 228, so that the planetary gear carrier 225 and the output ring 227 can rotate relative to the housing 211.

[0102] like Figure 7As shown, in this embodiment, the pinion gear and the gear ring 224 meshing therewith can be located on the axial inner side of the large gear (i.e., the side close to the motor 21). Moreover, the pinion gear and the gear ring 224 meshing therewith can be at least partially located on the radial inner side of the motor 21 as a radial flux motor, so that the space inside the outer rim 12 can be fully utilized and the axial size of the hub drive system can be reduced.

[0103] The reducer 22 includes a planetary gear 223 in the form of a double-row gear. The gears of the reducer 22 are at least partially located radially inside the motor 21 which is a radial flux motor. That is, the gears of the motor 21 and the reducer 22 at least partially overlap in the axial direction A (occupy the same axial position). In this way, the axial dimension of the hub drive system can be reduced while ensuring the torque of the hub drive system.

[0104] It should be understood that at least some aspects or features of the above-mentioned implementation modes, embodiments or examples may be appropriately combined.

[0105] It is understood that in the present application, when the number of parts or components is not particularly limited, the number may be one or more, and the multiple here means two or more. For the case where the number of parts or components shown in the drawings and / or described in the specification is a specific number such as two, three, four, etc., the specific number is usually exemplary and not restrictive, and it can be understood as multiple, that is, two or more, but this does not mean that the present application excludes the case of one.

[0106] In the present application, unless otherwise clearly stated or limited, the terms such as "install", "assemble", "assemble", "connect", "connect", "couple", "link", "abut", "connect", "interconnect", "intercommunication", "conduction", "fixation", "fastening" and the like should be understood in a broad sense, for example, they can be direct or indirect. For example, regarding connection, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly stated or limited. For example, regarding connectivity / conduction, it can be direct connectivity / conduction, or it can be indirect connectivity / conduction via an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0107] In the present application, unless otherwise clearly stated or limited, a component disposed on / installed on / located on / accommodated on / placed in, within, inside, etc. another component may be any of the following two situations: a part or most of the one component is located in the other component; and the one component is completely accommodated in the other component.

[0108] Although the present application is described in detail using the above-mentioned embodiments, it is obvious to those skilled in the art that the present application is not limited to the embodiments described in this specification. The present application can be modified and implemented as a modified embodiment without departing from the subject matter and scope of the present application as determined by the claims. Therefore, the description in this specification is for the purpose of illustration and does not have any restrictive meaning for the present application.

Claims

1. A wheel hub drive system, characterized in that: include: A wheel rim (1), the wheel rim (1) comprising an inner wheel rim (11) and an outer wheel rim (12), the inner wheel rim (11) and the outer wheel rim (12) being connected together side by side; A driving module (2), the driving module (2) comprising a motor (21) and a reducer (22), the output end of the motor (21) being connected to the input end of the reducer (22), and the driving module (2) being arranged inside the outer wheel rim (12); A wheel hub module (3), the wheel hub module (3) comprising a wheel hub shaft (31) and a flange (34), the flange (34) being rotatably connected to the wheel hub shaft (31) relative to the wheel hub shaft (31), the wheel hub shaft (31) supporting a motor rotor (213) of the motor (21) and the flange (34); and A brake module (4), wherein the brake module (4) is arranged inside the inner rim (11).

2. The wheel hub drive system according to claim 1, characterized in that: The hub shaft (31) is provided with an axial hole (315), and the axial hole (315) is a through hole.

3. The wheel hub drive system according to claim 1, characterized in that: The reducer (22) is a single-stage planetary gear reducer or a multi-stage planetary gear reducer.

4. The wheel hub drive system according to claim 1, characterized in that: The motor (21) is a dual-rotor axial flux motor, and the reducer (22) is located on the axial side of the dual-rotor axial flux motor.

5. The wheel hub drive system according to claim 1, characterized in that: The motor (21) is a radial flux motor, and the reducer (22) comprises a first planetary gear unit (22A) and a second planetary gear unit (22B), wherein the first planetary gear unit (22A) is at least partially located radially inside the radial flux motor.

6. The wheel hub drive system according to claim 1, characterized in that: The motor (21) is a radial flux motor, the reducer (22) comprises a planetary gear (223), the planetary gear (223) is a double-row gear, and the gear of the reducer (22) is at least partially located radially inside the radial flux motor.

7. The wheel hub drive system according to claim 1, characterized in that: The reducer (22) is located on an axial side of the motor (21) close to the brake module (4), and an output end of the reducer (22) is directly connected to the flange (34); or The reducer (22) is located on an axial side of the motor (21) away from the brake module (4), and an output end of the reducer (22) and the flange (34) are connected via an output ring (227).

8. The wheel hub drive system according to claim 1, characterized in that: The motor (21) comprises a rotor axial support bearing (214), which is arranged on one axial side or both axial sides of a motor rotor (213) or a motor rotor frame of the motor and is used to bear an axial load from the reducer (22).

9. The wheel hub drive system according to claim 1, characterized in that: The brake module (4) comprises a brake caliper (41), the wheel hub shaft (31) is provided with a plate-shaped brake caliper connecting portion (311), and the brake caliper (41) is mounted on the brake caliper connecting portion (311).

10. A vehicle, characterized in that: The vehicle comprises the wheel hub drive system according to any one of claims 1 to 9, and when the wheel hub drive system is mounted on the vehicle, the inner rim (11) is located on the inner side of the outer rim (12) in the vehicle width direction.

Images