Hub motor driving system and vehicle

Abstract

The invention discloses a hub motor driving system and a vehicle, and belongs to the technical field of automobile power transmission. The hub motor driving system comprises a wheel and a hub motor, and the hub motor comprises a brake, a driving motor and a speed reducer. The wheel is provided with a spoke back cavity formed in the axial direction, the brake and the driving motor are arranged side by side in the axial direction of the wheel, the brake is located in the spoke back cavity, the brake and the driving motor define a mounting cavity for mounting the speed reducer, and the speed reducer is located in the mounting cavity. According to the hub motor driving system, the brake and the driving motor are arranged side by side, and the driving motor and the brake define the mounting cavity for mounting the speed reducer, so that the speed reducer is located in the brake and the driving motor, the space on the inner sides of the speed reducer and the driving motor is utilized, and the axial size of the hub motor is not increased by the speed reducer any more; the axial length of the hub motor is reduced, and the integration level of the hub motor is higher, so that the occupied space of the hub motor in the axial direction of the wheel is smaller, and the integration level of the hub motor driving system is higher and the size is smaller.

Description

Technical Field

[0001] The present application belongs to the technical field of automobile power transmission, and in particular, relates to a wheel hub motor drive system. Background Art

[0002] With the development of the automobile industry, new energy drive motors have become key components that all OEMs focus on developing. Hub motors have the characteristics of short transmission chains and precise torque control, making them increasingly favored products by automobile companies.

[0003] In the related art, the hub motor occupies a large space in the axial direction of the wheel.

[0004] SUMMARY OF THE INVENTION

[0005] The present application aims to at least to some extent solve the technical problem that the wheel hub motor occupies a large space in the axial direction of the wheel. To this end, the present application provides a wheel hub motor drive system and a vehicle.

[0006] In a first aspect, an embodiment of the present application provides a wheel hub motor drive system, comprising:

[0007] A wheel having a spoke back cavity;

[0008] The hub motor includes a brake, a drive motor and a reducer. The brake and the drive motor are arranged side by side along the axial direction of the wheel, and the brake is located in the spoke back cavity. The brake and the drive motor together form a reducer installation cavity for installing the reducer, and the reducer is located in the reducer installation cavity.

[0009] In some embodiments, the brake comprises:

[0010] A brake drum, which is mounted on the reducer and located in the spoke back cavity, and has a sink groove;

[0011] A brake actuator assembly is installed on the drive motor and is located in the sink, and the brake actuator assembly can contact the brake drum.

[0012] In some embodiments, the brake actuator assembly includes a driver and a brake assembly, both of which are mounted on the drive motor, and the driver is used to drive the brake assembly to move so that the brake assembly can contact the inner wall of the brake drum.

[0013] In some embodiments, the brake drum includes a fixing portion, a connecting portion and a braking portion, wherein the connecting portion is disposed around the outer periphery of the fixing portion, and the braking portion is disposed around the outer periphery of the fixing portion;

[0014] The braking portion and the connecting portion are arranged at an angle so that the braking portion and the connecting portion enclose the sink;

[0015] The fixing portion is connected to the speed reducer, and the brake actuating assembly is in contact with the braking portion.

[0016] In some embodiments, a profile of the connecting portion is adapted to a profile of the spoke back cavity.

[0017] In some embodiments, the drive motor includes a motor housing assembly and a motor drive component mounted in the motor housing assembly;

[0018] The reducer comprises a reducer housing assembly and a reducer actuator assembly installed in the reducer housing;

[0019] The brake drum is installed on the reducer housing assembly, and the brake actuator is installed on the motor housing.

[0020] In some embodiments, the motor housing assembly includes a motor housing and a motor end cover, the motor housing and the motor end cover are arranged side by side along the axial direction of the wheel, and the motor housing is located on the side of the motor end cover close to the spoke back cavity; the brake actuator is installed on the end face of the motor housing facing the spoke back cavity.

[0021] In some embodiments, the reducer housing assembly includes a reducer housing and a reducer end cover, the reducer housing extends into the motor housing and is fixedly connected to the motor housing, and the reducer end cover is located outside the motor housing and on a side of the reducer housing close to the spoke back cavity;

[0022] The motor drive assembly includes a rotor connecting frame, the reducer housing, the reducer end cover and the rotor connecting frame together form a reducer actuator installation cavity for installing the reducer actuator, the reducer actuator is installed in the reducer actuator installation cavity, and the reducer end cover is connected to the reducer actuator;

[0023] The brake drum is mounted on the reducer end cover.

[0024] In some embodiments, the reducer execution component includes:

[0025] A sun gear connected to the rotor connecting frame;

[0026] A planetary gear and a planetary carrier, wherein the planetary gear is rotatably connected to the planetary carrier and the planetary gear is also meshed with the sun gear;

[0027] The reducer inner gear ring is sleeved on the planet carrier and meshes with the planetary gears, and the reducer inner gear ring is fixedly connected to the reducer housing;

[0028] Wherein, the reducer end cover is installed on the planetary carrier.

[0029] In some embodiments, the planet carrier is further sleeved on the rotor connecting frame, and the reducer assembly further includes:

[0030] A first bearing is installed between the planet carrier and the reducer housing;

[0031] The second bearing is installed between the rotor connecting frame and the motor end cover.

[0032] In some embodiments, the motor drive assembly includes a rotor connecting frame, and a circle of protrusions arranged at intervals is arranged on the end surface of the rotor connecting frame away from the brake;

[0033] The wheel hub motor drive system further comprises a wheel speed sensor, which is mounted on the motor housing assembly, and a detection end of the wheel speed sensor is arranged opposite to the protruding portion.

[0034] In a second aspect, an embodiment of the present application provides a vehicle, comprising the hub motor drive system described in the first aspect above.

[0035] The present invention has at least the following beneficial effects:

[0036] The present invention provides a wheel hub motor drive system, comprising a wheel and a wheel hub motor, wherein the wheel hub motor comprises a brake, a drive motor and a reducer. The wheel has a spoke back cavity arranged along the axial direction, the brake and the drive motor are arranged side by side along the axial direction of the wheel, and the brake is located in the wheel spoke back cavity, the brake and the drive motor together form an installation cavity for installing the reducer, and the reducer is located in the installation cavity.

[0037] The wheel hub motor drive system of the present invention arranges the brake and the drive motor side by side, and the drive motor and the brake are combined to form an installation cavity for installing the reducer, so that the reducer is located inside the brake and the drive motor, and the space inside the reducer and the drive motor is utilized, so that the reducer no longer increases the axial size of the wheel hub motor, the axial length of the wheel hub motor is reduced, and the integration of the wheel hub motor is higher. Therefore, the wheel hub motor occupies less space in the axial direction of the wheel, and the wheel hub motor drive system has higher integration and smaller size.

[0038] In the related schemes, the reducer is arranged side by side with the drive motor, the distance between the reducer and the drive motor is relatively far, and the total length of the sun gear of the reducer and the rotor connecting frame of the drive motor is relatively long. In order to ensure the stability of the sun gear and the rotor connecting frame during rotation, multiple bearings are arranged on the sun gear and the rotor connecting frame in these schemes, and a series of oil seals and other components are adaptively installed to ensure the lubrication performance of the bearings. After the design of this application, the reducer is located on the inner side of the drive motor, the reducer and the drive motor are highly integrated, and the distance between the reducer and the drive motor is relatively close, which can shorten the total length of the sun gear and the rotor connecting frame to a certain extent, thereby reducing the large-scale components such as bearings and oil seals in the hub motor, thereby reducing the system raw material cost and reducing the development risk.

[0039] The present invention also creatively arranges the brake of the hub motor in the back cavity of the wheel spoke, which can bring the following effects: 1. After such a design, the space of the back cavity of the wheel spoke is utilized, which can effectively reduce the size of the wheel hub motor drive system in the axial direction, and help to make the wheel hub motor completely embedded in the wheel; 2. After such a design, the brake is arranged close to the wheel spoke, and during the formation of the vehicle, the airflow can flow to the brake through the through holes on the wheel spoke, taking away the heat on the brake, improving the heat dissipation performance of the brake, and facilitating the natural heat dissipation of the brake; 3. After such a design, the brake is arranged at the low-speed wheel end, that is, between the reducer and the wheel, which can reduce the coupling degree between the brake and the drive motor, and reduce the influence of the brake heat on the performance of the drive motor, the permanent magnet, and the insulating material; 4. After such a design, the brake is close to the wheel spoke, and the brake is moved to the outside, which can facilitate the observation, inspection and replacement of the brake wear during vehicle maintenance. When replacing the wearable parts of the brake and other components, it is only necessary to disassemble the wheel without disassembling the drive motor and the reducer, thereby improving the convenience of brake maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 A schematic structural diagram of a wheel hub motor drive system in one or more embodiments of the present application is shown.

[0042] Figure 2 Shows Figure 1 Explosion diagram.

[0043] Figure 3 Shows Figure 1 Section Figure 1 .

[0044] Figure 4 Shows Figure 1 Section Figure 2 .

[0045] Figure 5 Shows Figure 1 Hidden wheel structure Figure 1 .

[0046] Figure 6 Shows Figure 1 Hidden wheel structure Figure 2 .

[0047] Figure 7 Shows Figure 6 Schematic diagram of the local structure after hiding the motor housing.

[0048] Figure 8 A schematic diagram of the brake structure of a hub motor drive system in one or more embodiments of the present application is shown.

[0049] Fig. 9 A schematic diagram of the structure in which a brake actuator is installed on a motor housing in one or more embodiments of the present application is shown.

[0050] Fig.10 A cross-sectional view of a wheel of a wheel hub motor drive system in one or more embodiments of the present application is shown.

[0051] Reference numerals:

[0052] 1000-wheel hub motor drive system, 100-wheel, 100a-spoke back cavity, 110-rim, 120-spoke, 200-wheel hub motor, 200a-reducer installation cavity, 210-brake, 211-brake drum, 211a-sink, 2111-fixing part, 2112-connecting part, 2113-braking part, 212-brake actuator, 2121-driver, 2122-brake assembly, 21221-brake shoe, 21222-brake shoe reset part, 220-drive motor, 221-motor housing assembly, 2211-motor housing, 2212-motor Machine end cover, 222-motor drive assembly, 2221-rotor connecting frame, 22211-protrusion, 2222-rotor core, 2223-permanent magnet, 2224-stator, 2225-cooling water jacket, 2226-third bearing, 2227-wheel speed sensor, 230-reducer, 231-reducer housing assembly, 2311-reducer housing, 2312-reducer end cover, 232-reducer actuator, 2321-sun gear, 2322-planetary gear, 2323-planet carrier, 2324-reducer inner ring gear, 2325-first bearing, 2326-second bearing. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0055] In the present invention, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In addition, the descriptions of "first", "second", etc. in the content of the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the content of the present invention.

[0057] With the development of the automobile industry, new energy drive motors have become key components that all OEMs focus on developing. Hub motors have the characteristics of short transmission chains and precise torque control, making them increasingly favored products by automobile companies.

[0058] Hub motors are mainly divided into two types: direct-drive outer rotor hub motors and reduction inner rotor hub motors. Direct-drive outer rotor hub motors have a simple structure, but their low torque density and poor scalability of electromagnetic topology are not conducive to the performance characteristics of hub motors. Reduction inner rotor hub motors are integrated products of motors and reducers. When the output torque of the motor remains unchanged, the final output torque can be increased through the reducer, thereby improving the output torque of the entire system and improving the performance of the entire vehicle. However, because of the need to integrate the reducer and brakes and other signal systems required for vehicle driving, the rationality of the integration solution has become a bottleneck restricting the development of reduction hub motors within the limited rim space.

[0059] In the related art, there is a technical problem that the wheel hub motor occupies a large space in the axial direction of the wheel. The embodiment of the present application provides a wheel hub motor drive system 1000 and a vehicle, which can at least solve the technical problem that the wheel hub motor occupies a large space in the axial direction of the wheel to a certain extent.

[0060] The inventor of this application studied the relevant technology and found that:

[0061] The Chinese invention patent with the patent publication number CN111169274A discloses a wheel hub motor drive system and a motor vehicle. The patent integrates the reducer, the inner rotor motor and the brake in series in the order from the outer side to the inner side of the wheel. However, the inventor analyzed and found that the patent has the following problems:

[0062] 1. It adopts a high-speed end braking solution, which cannot solve the problem of reduced braking system performance at high linear speeds;

[0063] 2. Since the brake is integrated inside the motor, the heat generated by the brake is difficult to dissipate, which may cause performance degradation or even damage to the motor;

[0064] 3. Its layout configuration has an obvious series structure of reducer, motor and brake, which results in the end face of the hub motor system still being a flat structure, and the spoke back cavity space cannot be effectively utilized;

[0065] 4. Its overall layout is simple and lacks integration, so it cannot provide installation space for wheel speed sensors and cannot meet regulatory requirements when installed on the vehicle;

[0066] 5. The brake is located inside the motor cavity, which is not convenient for daily wear observation and maintenance.

[0067] The Chinese invention patent with the patent publication number CN116409138 A discloses a wheel hub motor drive system and a motor vehicle. The patent adopts a disc brake, a reducer, and a motor in series. In the application of the whole vehicle, the brake of the original vehicle can be used to reduce the development cycle. At the same time, the motor and the reducer are placed inside the body suspension, which improves the versatility of the product. However, the inventor analyzed and found that the patent has the following problems:

[0068] 1. The patent adopts a disc brake, and the axial size increases sharply, which is not conducive to the effective use of vehicle space. In order to meet the carrying requirements, the motor and reducer have been placed inside the outer option of the rim, which is very easy to be bumped by road debris during driving, which is not conducive to product protection, and the wiring harness is easy to be scratched and torn off;

[0069] 2. The patent fails to integrate the motor, brake, and reducer inside the wheel, resulting in low overall space utilization;

[0070] 3. When repairing the motor and reducer, this patent requires removal and installation from the suspension side, which is inconvenient.

[0071] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0072] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the wheel hub motor driving system 1000 includes a wheel 100 and a wheel hub motor 200 .

[0073] The wheel 100 has a spoke back cavity 100a.

[0074] You can refer to Fig.10 As shown, the wheel 100 includes a rim 110 and a spoke 120. The rim 110 can be used to install a tire, and the spoke 120 can be used to connect the hub motor 200 and the rim 110. The spoke 120 can also play a role in supporting the rim 110. The spoke 120 of the wheel 100 is usually designed to be a structure protruding in a direction away from the rim 110, and then a spoke back cavity 100a is formed on the spoke 120. The design of the spoke back cavity 100a is an important means of lightweight design of the wheel 100. By optimizing the structure of the spoke back cavity 100a, the weight of the wheel 100 can be effectively reduced while ensuring the strength and rigidity of the wheel 100. This weight reduction design not only helps to improve the fuel economy of the vehicle, but also improves the handling performance and acceleration performance of the vehicle. In the specific design, the optimal back cavity line will be designed according to the front shape curve of the wheel 100 and the envelope line of the caliper, and then the weight reduction cavity will be designed on the back of the spoke 120. The excellent design of the spoke back cavity 100a not only significantly reduces the weight of the wheel 100, but also balances the stress distribution of the spokes 120 and improves the utilization rate of the materials.

[0075] like Figure 1 , Figure 2 and Figure 5 As shown, the wheel hub motor 200 includes a brake 210, a drive motor 220 and a reducer 230. The brake 210 and the drive motor 220 are arranged side by side along the axial direction of the wheel 100, and the brake 210 is located in the spoke back cavity 100a. The brake 210 and the drive motor 220 together form a reducer installation cavity 200a for installing the reducer 230, and the reducer 230 is located in the reducer installation cavity 200a.

[0076] The brake 210 is located on the side of the drive motor 220 close to the spoke back cavity 100a, and the reducer 230 is located on the inner side of the brake 210 and the drive motor 220. When the vehicle needs to stop or slow down, the brake 210 can stop or slow down the wheel 100 by generating a braking torque to ensure the safety of the vehicle. When the drive motor 220 stops running, the brake 210 can lock the position of the wheel 100 to prevent the wheel 100 from accidentally rotating due to external force, which can protect the drive motor 220 and the vehicle. The drive motor 220 can convert electrical energy into mechanical energy to drive the wheel 100 to rotate. The reducer 230 plays the role of reducing speed and increasing torque, and can convert the high-speed and low-torque power generated by the drive motor 220 into low-speed and high-torque power to meet the needs of vehicle driving.

[0077] The hub motor drive system 1000 of the present invention arranges the brake 210 and the drive motor 220 side by side, and the drive motor 220 and the brake 210 are combined to form an installation cavity for installing the reducer 230, so that the reducer 230 is located inside the brake 210 and the drive motor 220, and the space inside the reducer 230 and the drive motor 220 is utilized, so that the reducer 230 no longer increases the axial size of the hub motor 200, the axial length of the hub motor 200 is reduced, and the integration of the hub motor 200 is higher. Therefore, the hub motor 200 occupies less space in the axial direction of the wheel 100, and the hub motor drive system 1000 has a higher integration and a smaller size.

[0078] In the related schemes, the reducer 230 is arranged side by side with the drive motor 220, the distance between the reducer 230 and the drive motor 220 is relatively far, and the total length of the sun gear 2321 of the reducer 230 and the rotor connecting frame 2221 of the drive motor 220 is relatively long. In these schemes, in order to ensure the stability of the sun gear 2321 and the rotor connecting frame 2221 during rotation, multiple bearings will be arranged on the sun gear 2321 and the rotor connecting frame 2221, and in order to ensure the lubrication performance of the bearings, a series of oil seals and other components will be installed adaptively. After the design of the present application, the reducer 230 is located on the inner side of the drive motor 220, the reducer 230 is highly integrated with the drive motor 220, and the distance between the reducer 230 and the drive motor 220 is relatively close, which can shorten the total length of the sun gear 2321 and the rotor connecting frame 2221 to a certain extent, thereby reducing the large-scale components such as bearings and oil seals in the hub motor 200, thereby reducing the system raw material cost and reducing the development risk.

[0079] The present invention also creatively arranges the brake 210 of the hub motor 200 in the spoke back cavity 100a, which can bring the following effects:

[0080] 1. With this design, the space of the spoke back cavity 100a is utilized, which can effectively reduce the size of the hub motor drive system 1000 in the axial direction, and help the hub motor 200 to be fully embedded in the wheel 100;

[0081] Second, with this design, the brake 210 is disposed close to the spoke 120 of the wheel 100. During the vehicle formation process, airflow can flow to the brake 210 through the through holes on the spoke 120, taking away the heat on the brake 210, thereby improving the heat dissipation performance of the brake 210 and facilitating the natural heat dissipation of the brake 210.

[0082] 3. With this design, the brake 210 is arranged at the low-speed wheel end, that is, between the reducer 230 and the wheel 100, which can reduce the coupling degree between the brake 210 and the drive motor 220, and reduce the impact of braking heat on the performance of the drive motor 220, the permanent magnet 2223, and the insulating material.

[0083] 4. With this design, the brake 210 is close to the spoke 120 of the wheel 100, and the brake 210 is moved to the outside, which can facilitate the observation, inspection and replacement of the wear of the brake 210 during vehicle maintenance. When replacing the easily worn parts and other components of the brake 210, it is only necessary to disassemble the wheel 100 without disassembling the drive motor 220 and the reducer 230, thereby improving the maintenance convenience of the brake 210.

[0084] It can be seen that the hub motor drive system 1000 of the present invention has, to a certain extent, basically overcome the technical problems existing in CN111169274A and CN116409138A, and compared with the related technologies, this solution has greater innovation and progress.

[0085] like Figure 3 As shown, in some embodiments, the brake 210 includes a brake drum 211 and a brake actuator 212. The brake drum 211 is installed on the reducer 230 and is located in the spoke back cavity 100a, and the brake drum 211 has a sink 211a. The brake actuator 212 is installed on the drive motor 220 and is located in the sink 211a, and the brake actuator 212 can contact the brake drum 211.

[0086] The brake 210 is a drum brake. It is easy to understand that the wheel 100 is mounted on the reducer 230, the drive motor 220 drives the reducer 230 to rotate, and the reducer 230 drives the wheel 100 to rotate. The brake drum 211 is mounted on the reducer 230, and the brake drum 211 will rotate with the reducer 230 and the wheel 100. The brake actuator 212 is mounted on the drive motor 220. The brake actuator 212 can be mounted on the motor housing assembly 221 of the drive motor 220. The motor housing assembly 221 will not rotate. When the vehicle needs to stop or slow down, the driver steps on the brake, which can drive the brake actuator 212 to operate, so that the brake actuator 212 contacts the brake drum 211, and applies a certain amount of force to the brake drum 211, so that the wheel 100 stops or slows down, ensuring the safety of the vehicle, and then realizing the braking function. The present application does not limit the structure of the drive motor 220. The drive motor 220 may include components such as a stator 2224, a rotor connecting frame 2221, and a motor housing assembly 221. When the drive motor 220 includes the motor housing assembly 221, the brake actuator 212 may be installed on the motor housing assembly 221. Of course, it may also be installed on other components, which is not limited in the present application.

[0087] After such a design, the brake actuator component 212 is directly installed on the drive motor 220 without separately setting up components such as a brake base plate for installing the brake actuator component 212. In other words, such a design integrates the functions of the drive motor 220. The drive motor 220 integrates the functions of providing an installation reference for the brake actuator component 212 and fixing the brake actuator component 212, so that the structure of the brake 210 is simplified, and then the structure of the hub motor 200 is simplified, which can reduce the production cost of the hub motor drive system 1000. In addition, it can also reduce the axial size of the brake 210 in the wheel 100, and then reduce the axial size of the hub motor 200 in the wheel 100, reduce the axial space requirement of the hub motor 200 in the wheel 100, improve the integration of the hub motor drive system 1000, and reduce the axial space requirement for the installation of the hub motor drive system 1000.

[0088] like Figure 8 As shown, in some embodiments, the brake actuator 212 includes a driver 2121 and a brake assembly 2122, both of which are installed on a drive motor 220, and the driver 2121 is used to drive the brake assembly 2122 to operate so that the brake assembly 2122 can contact the inner wall of the brake drum 211.

[0089] Under the action of the driver 2121, the driver 2121 can drive the brake assembly 2122 to move, so that the brake 210 can contact the brake drum 211, and then exert a certain force on the brake drum 211, so that the brake drum 211 slows down or stops rotating, thereby achieving the braking effect. When the driver 2121 does not drive the brake assembly 2122, the brake 210 does not contact the brake drum 211.

[0090] The structure of the brake assembly 2122 is diverse and is not limited in the present application. In some embodiments, the driver 2121 is a brake cylinder, which is a hydraulic cylinder. The brake assembly 2122 includes a brake shoe reset member 21222 and two brake shoes 21221. The two brake shoes 21221 are arranged opposite to each other. One side of the brake shoe 21221 is connected to the motor housing assembly 221 of the drive motor 220 through a support pin, and the other side of the brake shoe 21221 is connected to the brake cylinder. The brake shoe reset member 21222 is connected to the two brake shoes 21221. Under the action of the brake cylinder, the two brake shoes 21221 move away from each other, the brake shoe reset member 21222 stretches, and the brake shoe 21221 contacts the inner wall of the brake drum 211. When the brake cylinder stops acting, the brake shoe reset member 21222 recovers its deformation, driving the two brake shoes 21221 to move closer and no longer contact the inner wall of the brake drum 211.

[0091] like Figure 4 and Figure 8 As shown, in some embodiments, the brake drum 211 includes a fixing portion 2111, a connecting portion 2112 and a braking portion 2113, the connecting portion 2112 is arranged around the outer periphery of the fixing portion 2111, and the braking portion 2113 is arranged around the outer periphery of the fixing portion 2111; the braking portion 2113 and the connecting portion 2112 are arranged at an angle so that the braking portion 2113 and the connecting portion 2112 are combined to form a recessed groove 211a; the fixing portion 2111 is connected to the reducer 230, and the brake actuator 212 can contact the braking portion 2113.

[0092] That is to say, the connecting portion 2112 is an annular structure, the braking portion 2113 is located on the outside of the connecting portion 2112, the fixing portion 2111 is located on the inside of the connecting portion 2112, and the connecting portion 2112 is located between the fixing portion 2111 and the braking portion 2113, so that the fixing portion 2111 and the braking portion 2113 are fixedly connected together. The angle setting can be a right angle setting, an obtuse angle setting or an acute angle setting, which is not limited in this application. The braking portion 2113 is set at an angle with the connecting portion 2112, so that the braking portion 2113 is not parallel to the connecting portion 2112, and then the braking portion 2113 and the connecting portion 2112 are enclosed into a sink 211a to accommodate the brake actuator 212. It is easy to understand that the brake actuator 212 extends into the sink 211a through the notch of the sink 211a. The brake actuator 212 can contact the brake part 2113. Specifically, when the vehicle is to brake or decelerate, the brake actuator 212 contacts the inner wall of the brake part 2113 and applies force to the brake part 2113, thereby causing the brake drum 211 to decelerate or stop rotating, thereby achieving the braking effect.

[0093] According to the above design, the functions of the brake drum 211 are divided into zones, so that the connecting part 2112 is fixedly connected to the reducer 230, so that the braking part 2113 is in contact with the brake actuator 212 and bears the force applied by the brake actuator 212, so that the connecting part 2112 connects the braking part 2113 and the connecting part 2112, so that the connecting part 2112 and the braking part 2113 are surrounded by a recessed groove 211a, and the connecting part 2112 can play a role in large-area heat dissipation, thereby optimizing the structural layout of the brake drum 211, helping to enhance the heat dissipation efficiency of the brake drum, reducing thermal stress concentration, and improving the durability of the brake drum 211.

[0094] In some embodiments, the profile of the connecting portion 2112 is adapted to the profile of the spoke back cavity 100 a .

[0095] That is to say, the outer surface of the connecting portion 2112 is adapted to the inner surface of the spoke back cavity 100a, and the gap values ​​between the outer surface of the connecting portion 2112 and the inner surface of the spoke back cavity 100a tend to be consistent, so that the connecting portion 2112 is arranged as close to the spoke back cavity 100a as possible to make full use of the space of the spoke back cavity 100a, to ensure that the groove 211a has enough space to accommodate the brake actuator component 212, so as to facilitate the installation of the brake actuator component 212, further improve the integration of the hub motor 200, make the hub motor 200 occupy less space in the axial direction of the wheel 100, and make the hub motor drive system 1000 more integrated.

[0096] like Figure 3 As shown, in some embodiments, the drive motor 220 includes a motor housing assembly 221 and a motor drive component 222 installed in the motor housing assembly 221; the reducer 230 includes a reducer housing assembly 231 and a reducer actuator component 232 installed in the reducer housing 2311; the brake drum 211 is installed on the reducer housing assembly 231, and the brake actuator component 212 is installed on the motor housing assembly 221.

[0097] The motor housing assembly 221 is located outside the motor drive assembly 222, and can support and protect the motor drive assembly 222. The motor drive assembly 222 will be connected to the reducer 230, and is used to drive the reducer 230 to rotate, thereby driving the wheel 100 to rotate. The structure of the motor drive assembly 222 is diverse, and may include components such as a stator 2224, a rotor core 2222, and a permanent magnet 2223, which are not limited in this application. The reducer housing assembly 231 is located outside the reducer actuator assembly 232, and the reducer housing assembly 231 can support and protect the reducer actuator assembly 232 located therein. The structure of the reducer actuator assembly 232 is diverse, and may include components such as a sun gear 2321, planetary gears 2322, and a planet carrier 2323, which are not limited in this application.

[0098] like Figure 3 As shown, in some embodiments, the motor housing assembly 221 includes a motor housing 2211 and a motor end cover 2212, the motor housing 2211 and the motor end cover 2212 are arranged side by side along the axial direction of the wheel 100, and the motor housing 2211 is located on the side of the motor end cover 2212 close to the spoke back cavity 100a; Fig. 9 As shown, the brake actuator assembly 212 is installed on the end surface of the motor housing 2211 facing the spoke back cavity 100a.

[0099] The motor housing 2211 has a mounting groove, the notch of which faces the side away from the brake 210, that is, Figure 3On the right side of the figure, after the motor drive assembly 222 is installed in the mounting slot, the motor end cover 2212 covers the notch of the mounting slot and is fixedly connected to the motor housing 2211.

[0100] In some embodiments, the reducer housing assembly 231 includes a reducer housing 2311 and a reducer end cover 2312, the reducer housing 2311 extends into the motor housing 2211 and is fixedly connected to the motor housing 2211, the reducer end cover 2312 is located outside the motor housing 2211 and is located on the side of the reducer housing 2311 close to the spoke back cavity 100a; the motor drive assembly 222 includes a rotor connecting frame 2221, the reducer housing 2311, the reducer end cover 2312 and the rotor connecting frame 2221 together form a reducer actuator installation cavity for installing the reducer actuator assembly 232, the reducer actuator assembly 232 is installed in the reducer actuator installation cavity, and the reducer end cover 2312 is connected to the reducer actuator assembly 232; the brake drum 211 is installed on the reducer end cover 2312.

[0101] At least part of the reducer housing 2311 extends into the motor housing assembly 221. It is easy to understand that Fig. 9 As shown, a through hole is provided in the middle area of ​​the end surface of the motor housing 2211 close to the brake 210, that is, Figure 3 The left end face of the middle motor housing 2211 is provided with a through hole, through which the reducer housing 2311 extends into the motor housing assembly 221. The reducer housing 2311 is fixedly connected to the motor housing 2211, and the reducer end cover 2312 is fixedly connected to the reducer actuator 232. The reducer end cover 2312 will rotate under the action of the reducer actuator 232, and the brake drum 211 is installed on the reducer end cover 2312, so the brake drum 211 will rotate synchronously with the reducer end cover 2312.

[0102] In some embodiments, Figure 3 As shown, the reducer housing 2311 is entirely located in the motor housing assembly 221, and the reducer end cover 2312 is arranged close to the motor housing 221. After such a design, the remaining parts of the reducer 230 except the reducer end cover 2312 (i.e., the reducer housing 2311 and the reducer actuator 232) are completely embedded in the motor housing assembly 221, further improving the integration of the hub motor 200, making the hub motor 200 occupy less space in the axial direction of the wheel 100, and the hub motor drive system 1000 has a higher integration.

[0103] In some embodiments, the reducer actuator assembly 232 includes a sun gear 2321, a planetary gear 2322, a planetary carrier 2323 and a reducer inner ring gear 2324; the sun gear 2321 is connected to the rotor connecting frame 2221; the planetary gear 2322 is rotatably connected to the planetary carrier 2323, and the planetary gear 2322 is meshed with the sun gear 2321; the reducer inner ring gear 2324 is sleeved outside the planetary gear 2322 and meshed with the planetary gear 2322, and the reducer inner ring gear 2324 is fixedly connected to the reducer housing 2311; wherein the reducer end cover 2312 is installed on the planetary carrier 2323.

[0104] The sun gear 2321 is connected to the rotor connecting frame 2221. The rotation of the rotor connecting frame 2221 can drive the sun gear 2321 to rotate. Since the planetary gear 2322 is meshed with the sun gear 2321, the sun gear 2321 will drive the planetary gear 2322 to rotate. Since the planetary gear 2322 is rotatably connected to the planetary carrier 2323 and is also meshed with the reducer inner ring gear 2324, the planetary gear 2322 will rotate and revolve around the sun gear 2321. The planetary carrier 2323 will rotate driven by the planetary gear 2322. Since the reducer end cover 2312 is installed on the planetary carrier 2323, the reducer end cover 2312 will rotate with the planetary carrier 2323. Since the brake drum 211 is installed on the reducer end cover 2312, the brake drum 211 will rotate. The reducer housing 2311 is installed on the motor housing assembly 221. When the rotor connecting frame 2221 rotates, the motor housing assembly 221 is fixed, so the reducer housing 2311 does not rotate.

[0105] like Figure 3 and Figure 7 As shown, in some embodiments, the motor drive assembly 222 includes a rotor connecting frame 2221, and a circle of raised portions 22211 arranged at intervals is arranged on the end surface of the rotor connecting frame 2221 away from the brake 210; the hub motor drive system 1000 also includes a wheel speed sensor 2227, and the wheel speed sensor 2227 is installed on the motor housing assembly 221, and the wheel speed sensor 2227 is arranged opposite to the raised portion 22211.

[0106] like Figure 3As shown, the protrusion 22211 is arranged on the right end face of the rotor connecting frame 2221. The motor speed monitoring needs to be decoded and processed by the MCU before the speed signal can be sent to the whole vehicle for use. There are many signal processing units and a long path, which is prone to signal delay and poor stability. These embodiments detect the wheel speed through the wheel speed sensor 2227, and the wheel speed signal can be directly transmitted to the vehicle control system to avoid the delay and instability caused by signal forwarding. These embodiments reduce the occupation of the protrusion 22211 in the radial space by arranging the protrusion 22211 on the right end face of the rotor connecting frame 2221, and after such an arrangement, there is no need to separately arrange other components with the protrusion 22211, thereby improving the integration of the hub motor 200.

[0107] like Figure 3 As shown, in some embodiments, the planet carrier 2323 is also sleeved outside the rotor connecting frame 2221, and the reducer 230 assembly further includes a first bearing 2325 and a second bearing 2326, wherein the first bearing 2325 is installed between the planet carrier 2323 and the reducer housing 2311; and the second bearing 2326 is installed between the rotor connecting frame 2221 and the planet carrier 2323. The friction between the planet carrier 2323 and the reducer housing 2311 is reduced by the provision of the first bearing 2325, and the friction between the connecting frame 2221 and the planet carrier 2323 is reduced by the provision of the second bearing 2326.

[0108] In some embodiments, the motor drive assembly 222 includes a rotor connecting frame 2221, a rotor core 2222, a permanent magnet 2223, a stator 2224, a cooling water jacket 2225 and a third bearing 2226. The cooling water jacket 2225 is fixedly connected to the inner wall of the motor housing 2211, and encloses the motor housing 2211 to form a flow channel for the circulation of coolant to cool the stator 2224, the rotor core 2222 and other components. The rotor core 2222 and the permanent magnet 2223 are both fixed on the rotor connecting frame 2221, and the third bearing 2226 is located between the rotor connecting frame 2221 and the motor end cover 2212, and the rotor connecting frame 2221 and the motor end cover 2212 are rotatably connected through the third bearing 2226. The rotor connecting frame 2221 and the brake drum 211 enclose the reducer installation cavity 200a where the reducer 230 is installed.

[0109] Based on the same inventive concept, an embodiment of the present application further provides a vehicle, which includes the above-mentioned wheel hub motor drive system 1000.

[0110] Since the vehicle includes the above-mentioned wheel hub motor drive system 1000, it naturally has all the beneficial effects of the wheel hub motor drive system 1000 of the present application, which will not be elaborated here.

[0111] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0112] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0113] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A wheel hub motor drive system, characterized in that: include: A wheel (100) having a spoke back cavity (100a); A hub motor (200) comprises a brake (210), a drive motor (220) and a reducer (230), wherein the brake (210) and the drive motor (220) are arranged side by side along the axial direction of the wheel (100), and the brake (210) is located in the spoke back cavity (100a), and the brake (210) and the drive motor (220) together form a reducer installation cavity (200a) for installing the reducer (230), and the reducer (230) is located in the reducer installation cavity (200a).

2. The wheel hub motor drive system according to claim 1, characterized in that: The brake (210) comprises: A brake drum (211), installed on the reducer (230) and located in the spoke back cavity (100a), wherein the brake drum (211) has a sink groove (211a); A brake actuator component (212) is installed on the drive motor (220) and is located in the sink (211a); the brake actuator component (212) can contact the brake drum (211).

3. The wheel hub motor drive system according to claim 2, characterized in that: The brake actuator component (212) comprises a driver (2121) and a brake component (2122), wherein the driver (2121) and the brake component (2122) are both mounted on the drive motor (220), and the driver (2121) is used to drive the brake component (2122) to operate so that the brake component (2122) can contact the inner wall of the brake drum (211).

4. The wheel hub motor drive system according to claim 2, characterized in that: The brake drum (211) comprises a fixing portion (2111), a connecting portion (2112) and a braking portion (2113); the connecting portion (2112) is arranged around the outer periphery of the fixing portion (2111); and the braking portion (2113) is arranged around the outer periphery of the fixing portion (2111); The braking portion (2113) and the connecting portion (2112) are arranged at an angle, so that the braking portion (2113) and the connecting portion (2112) are combined to form the sink (211a); The fixing portion (2111) is connected to the reducer (230), and the brake actuator (212) is in contact with the brake portion (2113).

5. The wheel hub motor drive system according to claim 4, characterized in that: The contour of the connecting portion (2112) is adapted to the contour of the spoke back cavity (100a).

6. The wheel hub motor drive system according to any one of claims 2 to 5, characterized in that: The driving motor (220) comprises a motor housing assembly (221) and a motor driving component (222) installed in the motor housing assembly (221); The reducer (230) comprises a reducer housing assembly (231) and a reducer actuator component (232) installed in the reducer housing (2311); The brake drum (211) is installed on the reducer housing assembly (231), and the brake actuator component (212) is installed on the motor housing assembly (221).

7. The wheel hub motor drive system according to claim 6, characterized in that: The motor housing assembly (221) comprises a motor housing (2211) and a motor end cover (2212); the motor housing (2211) and the motor end cover (2212) are arranged side by side along the axial direction of the wheel (100), and the motor housing (2211) is located on a side of the motor end cover (2212) close to the spoke back cavity (100a); and the brake actuator component (212) is installed on the end surface of the motor housing (2211) facing the spoke back cavity (100a).

8. The wheel hub motor drive system according to claim 7, characterized in that: The reducer housing assembly (231) comprises a reducer housing (2311) and a reducer end cover (2312); the reducer housing (2311) extends into the motor housing (2211) and is fixedly connected to the motor housing (2211); the reducer end cover (2312) is located outside the motor housing (2211) and is located on a side of the reducer housing (2311) close to the spoke back cavity (100a); The motor drive assembly (222) comprises a rotor connecting frame (2221), the reducer housing (2311), the reducer end cover (2312) and the rotor connecting frame (2221) together form a reducer actuator installation cavity for installing the reducer actuator (232), the reducer actuator (232) is installed in the reducer actuator installation cavity, and the reducer end cover (2312) is connected to the reducer actuator (232); The brake drum (211) is mounted on the reducer end cover (2312).

9. The wheel hub motor drive system according to claim 8, characterized in that: The reducer execution component (232) includes: A sun gear (2321) connected to the rotor connecting frame (2221); A planetary gear (2322) and a planetary carrier (2323), wherein the planetary gear (2322) is rotatably connected to the planetary carrier (2323), and the planetary gear (2322) is meshed with the sun gear (2321); The reducer inner gear ring (2324) is sleeved outside the planetary gear (2322) and meshes with the planetary gear (2322), and the reducer inner gear ring (2324) is fixedly connected to the reducer housing (2311); Wherein, the reducer end cover (2312) is installed on the planetary carrier (2323).

10. The wheel hub motor drive system according to claim 9, characterized in that: The planet carrier (2323) is also sleeved outside the rotor connecting frame (2221), and the reducer (230) assembly further includes: A first bearing (2325) is installed between the planet carrier (2323) and the reducer housing (2311); The second bearing (2326) is installed between the rotor connecting frame (2221) and the planetary frame (2323).

11. The wheel hub motor drive system according to claim 6, characterized in that: The motor drive assembly (222) comprises a rotor connecting frame (2221), and a circle of raised portions (22211) arranged at intervals is arranged on the end surface of the rotor connecting frame (2221) away from the brake (210); The motor drive assembly (222) further comprises a wheel speed sensor (2227), wherein the wheel speed sensor (2227) is mounted on the motor housing assembly (221), and the wheel speed sensor (2227) is arranged opposite to the protruding portion (22211).

12. A vehicle, characterized in that: A wheel hub motor drive system (1000) comprising any one of claims 1-11.

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