CN210310748U

CN210310748U - Wheel hub motor assembly, wheel assembly and vehicle

Info

Publication number: CN210310748U
Application number: CN201921139629.9U
Authority: CN
Inventors: 洪飞; 刘正凯
Original assignee: Bosch Ningbo E Scooter Motor Co Ltd
Current assignee: Bosch Automotive Products Suzhou Co Ltd
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2020-04-14
Anticipated expiration: 2029-07-19

Abstract

The utility model provides an in-wheel motor assembly, wheel assembly and vehicle. Wheel and in-wheel motor have in the in-wheel motor assembly (200), in-wheel motor install in the wheel, the wheel has wheel hub (1), side cover (2), stops lid (5), in-wheel motor has main shaft (3) and stator (4), wheel hub (1) has magnetic ring (13), wherein, side cover (2) are in one side of magnetic ring (13) is arranged within magnetic ring (13) and stop lid (5) and the opposite side of magnetic ring (13) is arranged within magnetic ring (13), stator (4) suit is in on main shaft (3) and main shaft (3) are connected to and pass side cover (2) with stop lid (5), stator (4) are arranged by side cover (2) with in the accommodation space that stops lid (5) and constitute.

Description

Wheel hub motor assembly, wheel assembly and vehicle

Technical Field

The utility model belongs to the technical field of the electric motor car, especially, relate to an electric motor car in-wheel motor, particularly, the utility model relates to an in-wheel motor assembly, have the wheel assembly of in-wheel motor assembly and having the vehicle of wheel assembly.

Background

The electric vehicle is taken as a new era of travel tool, and has the characteristics of low price, convenience, environmental protection, easy operation and the like, so that the electric vehicle is more and more favored by consumers. The motor is used as a core component of the electric vehicle, the performance, efficiency, reliability and the like of the motor greatly influence the electric vehicle, and the high-performance driving motor has a decisive role in realizing the whole vehicle function of the electric vehicle.

At present, more and more rural areas choose electric vehicles as transportation tools, and the cost of the electric vehicles and the stability of the electric vehicles on complex rural roads are main consideration factors for farmers to choose the electric vehicles. The conventional hub motor of the electric vehicle has the problem of low motor conversion efficiency, and under complex road conditions (such as rural roads), the electric vehicle has the problems of insufficient power, weak climbing, short driving mileage, coil burning, Hall device burning and the like, and the motor fails and increases sharply.

The current industry practice is to increase the stator size by increasing the hub size to improve the overload resistance, for example, CN204578287U relates to an electric vehicle hub motor, which belongs to the electric vehicle technical field, and not only can effectively improve the torque performance and power density of the motor, but also can improve the working efficiency of the motor and reduce the material cost of the motor by lengthening the working force arm of the motor stator and rotor magnetic field, especially effectively reduce the expensive rare earth permanent magnet material; the hub motor is a ten-inch motor, the inner diameter of the rotor is 213 mm-250 mm, and the outer diameter of the stator is 206 mm-246 mm. The utility model discloses an electric motor car in-wheel motor has lengthened the work arm of force of deciding, rotor magnetic field through increase rotor internal diameter and stator external diameter to improve in-wheel motor's torque power and power density, be applicable to more and work under harsh operating modes such as the great or more mountain area of abrupt slope road of vehicle heavy burden.

But the increase of the size of the hub inevitably leads to the structural change of the electric vehicle and the increase of the manufacturing cost.

SUMMERY OF THE UTILITY MODEL

According to various aspects, the present invention is directed to improving the efficiency and overload resistance of an in-wheel motor without increasing the size of the wheel hub (e.g., the rim outer diameter) and manufacturing costs.

Furthermore, the present invention also aims to solve or alleviate other technical problems existing in the prior art.

The utility model discloses an in-wheel motor assembly, have the wheel assembly of in-wheel motor assembly and have the vehicle of wheel assembly solves above-mentioned problem, particularly, according to the utility model discloses an aspect provides:

the utility model provides an in-wheel motor assembly, in-wheel motor assembly has wheel and in-wheel motor, in-wheel motor install in the wheel, the wheel has wheel hub, side cover, the lid of stopping, in-wheel motor has main shaft and stator, wheel hub has the magnetic ring, wherein, the side cover is in one side of magnetic ring is arranged within the magnetic ring and the lid of stopping is in the opposite side of magnetic ring is arranged within the magnetic ring, the stator suit is in on the main shaft and the main shaft is connected to and passes the side cover with the lid of stopping, the stator is arranged by the side cover with in the accommodation space that the lid constitutes of stopping, wherein, the internal diameter of magnetic ring is 218~225mm, the thickness of magnetic ring is 3.5~7.5 mm.

According to the utility model discloses a further aspect, the utility model provides a wheel assembly, wheel assembly has the tire, wherein, wheel assembly still has any kind of wheel hub motor assembly of above-mentioned, wherein, the tire suit in on wheel hub's the rim.

According to another aspect of the present invention, the utility model provides a vehicle, wherein, the vehicle has above-mentioned wheel assembly.

Drawings

The above and other features of the present invention will become apparent with reference to the accompanying drawings, in which,

fig. 1 is a longitudinal cut-away view of one embodiment of an in-wheel motor assembly according to the present invention;

fig. 2 is a cross-sectional view of one embodiment of an in-wheel motor assembly according to the present invention;

fig. 3 is a schematic wheel hub view of an in-wheel motor assembly according to the present invention;

fig. 4 is a partial view of a stator core of the in-wheel motor assembly according to the present invention;

fig. 5 is a partial view of a straight permanent magnet structure of an in-wheel motor assembly according to the present invention;

fig. 6 is a partial view of a concentric arc permanent magnet structure of an in-wheel motor assembly according to the present invention;

fig. 7 is a partial view of an eccentric arc permanent magnet structure of an in-wheel motor assembly according to the present invention;

fig. 8 is a schematic view of a first example of the punching and forming of the stator core of the in-wheel motor assembly according to the present invention;

fig. 9 is a schematic diagram of a second example of the stator core roll punching forming of the in-wheel motor assembly according to the present invention.

Detailed Description

It is easily understood that, according to the technical solution of the present invention, a plurality of alternative structural modes and implementation modes can be proposed by those skilled in the art without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical solutions of the present invention, and should not be considered as limiting or restricting the technical solutions of the present invention in their entirety or in any other way.

The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms. Furthermore, the terms "first," "second," "third," and the like are used for descriptive and descriptive purposes only and not for purposes of indication or implication as to the relative importance of the respective components.

In the attached drawings, 1 is a hub; 11 is a rim; 12 is an air valve; 13 is a magnetic conductive ring; and 14 is a permanent magnet. 2 is a side cover; 21 is a right end cover; 22 is a bearing; and 23 is an oil seal. 3 is a main shaft; 31 is a wiring harness insert; and 32 is a motor shaft. 4 is a stator; 41 is a shaft sleeve; 42 is an iron core bracket; 43 is a stator core; 44 is a Hall circuit board; and 45 is a winding. 5 is a brake cover; 51 is a left end cap; 52 is a bearing; and 53 is an oil seal.

Referring to fig. 1 to 3, a longitudinal cut section, a transverse cut section and a hub schematic of an embodiment of an in-wheel motor assembly according to the present invention are shown. Wherein, in-wheel motor assembly 200 has wheel and in-wheel motor, in-wheel motor install in the wheel, the wheel has wheel hub 1, sideshield 2, stops lid 5, in-wheel motor has main shaft 3 and stator 4, wheel hub 1 has magnetic ring 13, wherein, sideshield 2 is in one side of magnetic ring 13 is arranged within magnetic ring 13 and stop lid 5 and the opposite side of magnetic ring 13 is arranged within magnetic ring 13, stator 4 suit is in on main shaft 3 and main shaft 3 is connected to and passes sideshield 2 with stop lid 5, stator 4 arranges by in the accommodation space that the sideshield 2 constitutes with stop lid 5, wherein, the internal diameter A3 of magnetic ring 13 is 218~225mm, the thickness A4 of magnetic ring 13 is 3.5~7.5 mm.

It is to be understood that the components described above and below are merely exemplary, and various features of the number, manufacturing manner, arrangement position, shape, connection manner, installation order, and the like thereof can be modified according to actual circumstances. In addition, it should be understood that the in-wheel motor is also called as in-wheel motor, and its most important feature is that the driving, transmission and braking devices are integrated into the wheel hub, and the transmission components such as clutch, speed changer, transmission shaft, differential mechanism and transfer case are omitted, so that the mechanical part of the electric vehicle is greatly simplified. Whereas a wheel is a rigid wheel that holds the inner rim of the tyre, supports the tyre and bears the load in conjunction with the tyre, is a rotating assembly that bears the load between the tyre and the axle (that is to say the wheel referred to herein does not include a tyre) and comprises two main components, namely a rim (which can be part of the hub) which is the component that mounts and supports the tyre on the wheel and a spoke (GB/T2933-2009) which is the supporting component on the wheel between the axle and the rim.

As shown in fig. 3, according to the above technical solution, under the condition that the outer diameter and the nominal diameter of the rim are not changed, that is, the tire mounting size of the hub is not changed, the inner diameter of the rim is adjusted to increase the outer diameter of the magnetic conductive ring and expand the magnetic conductive ring, or the inner diameter of the magnetic conductive ring is directly increased, so that the diameter of the accommodating cavity of the motor is increased, and the torque force arm of the permanent magnet attached to the inner wall of the magnetic conductive ring for torque output is increased. The hub motor assembly adopts a flat design, and under the same size, the motor has stronger output, large torque and more abundant power; under the same power, the hub motor assembly reduces the design stack height, thereby having more compact and portable structure and reducing the cost.

Regarding the arrangement, installation mode and principle of the hub motor assembly in other aspects, it should be understood that the hub 1 comprises a rim 11, a valve 12 embedded in a jack, a magnetic conductive ring 13 fixed by welding and a permanent magnet 14 glued to form a ring. The side cover 2 is locked on the circumferential surface of one side of the magnetic conduction ring 14 of the hub 1 through screws. In terms of internal structure, the bearing 22 and the oil seal 23 of the side cover 2 are pressed together by a press machine into the central inner hole of the right end cover 21 of the side cover 2. The brake cover 5 is locked on the circumferential surface of the other side of the magnetic conduction ring 14 of the hub 1 through a screw. In terms of internal structure, the bearing 52 and the oil seal 53 of the brake cover 5 are pressed into the central inner hole position of the left end cover 51 of the brake cover 5 together by a press machine. The stator 4 comprises a central shaft sleeve 41, the shaft sleeve 41 is welded on an iron core support 42, the iron core support 42 fixes a stator iron core 43 with an annular tooth space structure in an end riveting mode, a winding 45 is embedded on the iron core 43 according to a certain winding rule, and a Hall circuit board 45 is connected with a Hall element on the stator iron core 43 and is attached to the winding 45 through glue. One end of a wire harness plug-in 31 of the main shaft 3 is inserted into the winding 45 through an inclined slotted hole of a motor shaft 32 of the main shaft and is respectively connected with the winding 45 and a soldering tin terminal of a Hall circuit board 44, a knurling is arranged on a shaft body of the motor shaft 31 and is pressed into a shaft sleeve 41 through a pressure machine in an interference mode, a stator 4 is fixed on the main shaft 3, the main shaft 3 is connected with a side cover 2 and a brake cover 5 through a bearing, a hub 1 is locked and fixed through screws of two end covers, and an operation gap is arranged between the hub 1 and the stator 4, so that the two parts become core parts for converting electric energy. Hall elements for detecting the magnetic pole positions of the hub during operation are arranged on the stator core at intervals, Hall circuit boards collect Hall element signals and are connected and uploaded to a central control ECU platform of the electric vehicle, the ECU alternately energizes the winding 45 according to certain control logic according to Hall position models, so that an N/S rotating magnetic field is formed at the periphery of the stator, the rotating magnetic field and the permanent magnet 14 generate interaction force, the hub 1 is pulled to rotate, and the electric vehicle is pushed to run. In addition, the winding in the in-wheel motor stator can be made of copper wires or aluminum wires.

Furthermore, the brake cover 5 can be configured as a hub brake cover. It will be appreciated that the hub brake cover is formed by integrating a brake disc chamber on the side edge of the side cover as part of the brake mechanism. When the brake disc is installed, the brake disc is embedded into the brake chamber, and the brake disc gradually stops through the bulging friction of the back iron of the inner cavity of the brake disc chamber, so that the brake effect is achieved. The disc brake cover is formed by integrating a threaded cap on the center side of the outer side of the side cover, the brake mechanism is independent and is fixed on the end cover through a threaded knob, and the brake effect on the hub is achieved.

The hub 1 further comprises a rim 11, the magnetic conduction ring 13 is arranged in the rim 11, the nominal diameter A0 of the rim 11 is 254 +/-2 mm, the outer diameter A1 of the rim 11 is 265-275 mm, the inner diameter A2 of the rim 11 is increased and set to be 225-240 mm, and/or the thickness A5 of the permanent magnet 14 is 1.8-3 mm. These dimensions are indicated in fig. 3. Wherein, it is specifically optional that rim external diameter A1 sets up to 273.5mm, rim internal diameter A2 sets up to 234mm, and magnetic ring internal diameter sets up to 220mm, and magnetic ring thickness A4 sets up 7mm, and permanent magnet thickness A5 sets up 2 mm.

The utility model discloses except the optimization of magnetic conduction ring, still adjusted arranging, quantity, size etc. of permanent magnet. Specifically, on one hand, the permanent magnets 14 are sequentially attached to the inner side of the magnetic conductive ring 13 in a north-south pole alternating manner, so that the magnetic conductive effect is good, wherein the specific means of attachment may be a viscose structure or a plastic package structure. On the other hand, the permanent magnets 14 have the same size and are uniformly distributed on the inner side of the magnetic conductive ring 13, and the number of the permanent magnets 14 is 48 or 60, for example, 60, so that the connection strength is high and the manufacture is simple.

Referring to fig. 5 to 7, they are respectively a partial view of a straight permanent magnet structure, a partial view of a concentric arc permanent magnet structure, and a partial view of an eccentric arc permanent magnet structure of the in-wheel motor assembly according to the present invention. Wherein the hub 1 further has a permanent magnet 14, the permanent magnet 14 being arranged inside the flux ring 13, wherein the permanent magnet 14 is configured as a rectangle, a concentric sector or an eccentric sector.

It should be noted that the concentric sectors mean that the centers of the inner arc and the outer arc of the permanent magnet 14 are concentric, and relatively speaking, the non-concentric sectors mean that the centers of the inner arc and the outer arc of the permanent magnet 14 are non-concentric. Specifically, the permanent magnet shown in fig. 5 is a square/rectangular shape, and a gap is formed on one side of the permanent magnet attached to the magnetic conductive ring. And, there is an air gap also between the permanent magnet and one side of the stator core. The fixation can be done, for example, by removing air gaps by means of gluing. The permanent magnets shown in fig. 6 are concentric arc/fan/tile-shaped, one side of each permanent magnet is tightly attached to the inner side of the magnetic conductive ring, the other side of each permanent magnet and the stator core form an operating air gap, and the air gaps are uniform. The permanent magnet shown in fig. 7 is in an eccentric arc/fan/tile shape, and the arc surfaces of the permanent magnet, which are contacted with the magnetic conductive ring, are not completely attached, so that an air gap is formed, and the air gap can be eliminated by gluing the two ends of the permanent magnet to complete fixation. The structural scheme enables the glue to have good fluidity and larger bonding surface in the process of fixing the permanent magnet/magnetic steel by gluing, and can effectively improve the bonding and fastening force. The permanent magnets and the stator core form uniform air gaps, the air gaps are large, and the risk of rubbing due to the minimum gaps is avoided. As already mentioned above, it should be understood that several embodiments of the permanent magnets can also be used mixed, if necessary, i.e. the shape of the individual permanent magnets can differ.

Referring to fig. 4, 8 to 9, they are respectively a stator core partial view, a schematic view of a stator core roll-punching forming example one and a schematic view of an example two of the in-wheel motor assembly according to the present invention. The stator 4 has a stator core 43, a plurality of stator teeth are configured on the periphery of the stator core 43, and a stator slot is formed between the adjacent stator teeth, wherein the width of the slot opening of the stator slot is 2.0-2.5 mm. It should be understood that slot width refers to the dimension between the two ends of the tops of adjacent stator teeth, as indicated by T1. Through the selection of the multi-groove pole combination and the optimization of the tooth grooves, the power output of the hub motor is more uniform, the vibration noise is low, and the experience (such as riding) is better.

Regarding other dimensions of the stator core, optionally, the outer diameter of the stator core 43 is 211 to 220.4mm, the stator tooth width T2 of the stator core 43 is 5.0 to 5.5mm, and the yoke width T3 of the stator core 43 is 4.0 to 5.0 mm. The width of the yoke part is the unilateral distance from the inner diameter of the stator core to the bottom edge of the stator slot. For example, the outer diameter of the stator core is set to 215mm, the width T1 of the stator slot is set to 2.3mm, the width T2 of the stator tooth is set to 5.3mm, and the width T3 of the stator yoke is set to 4.4mm, so that the magnetic circuit and the circuit are matched more optimally, and the operation efficiency is better.

Regarding the number of the stator teeth, 54 stator teeth are configured on the periphery of the stator core 43, and the tooth top profile of the stator teeth is a straight line, which is achieved along with the spiral coil punching process, for example, and can form a tiny uneven air gap, which improves the air gap magnetic field and is beneficial to reducing the vibration of the motor operation.

It should be noted that, because the inner diameter of the stator core is large, in order to reduce material waste, the core forming process can adopt a spiral winding punching method, each sheet is riveted into a block, that is, the stator core is spirally wound, and finally the stator core is closed by using rivets, which can be well seen from fig. 8 and fig. 9 (wherein, the circular hole gap of fig. 8 is on the tooth central axis, and the circular hole gap of fig. 9 is on the groove central axis).

According to the utility model discloses an aspect in addition, the utility model also provides a wheel assembly, the wheel assembly has the tire, wherein, the wheel assembly still has any kind of above-mentioned in-wheel motor assembly 200, wherein, the tire suit in on wheel hub 1's rim 11. In addition, the wheel assembly can be mounted on a variety of vehicles, including cars, vans, passenger cars, hybrid vehicles, electric vehicles, and the like. Accordingly, the subject matter of the present invention is also directed to protecting various vehicles equipped with the wheel assembly of the present invention.

To sum up, the utility model provides a wheel hub motor assembly, have wheel assembly of the wheel hub motor assembly and have vehicle of the wheel assembly, it has changed conventional wheel hub rim external diameter and internal diameter ratio, under the circumstances that guarantees that the rim external diameter is unchangeable, enlarges the rim internal diameter, makes the motor arm of force embedded therein longer, and motor output torque is bigger; the magnetic conductive ring expands radially outwards to obtain a more flattened structure type compared with the prior motor. Therefore, under the same power, the axial length of the motor is smaller and tends to be flat, and the material consumption can be effectively reduced; under the same axial length size, motor output torque is bigger, and power is more surge. Meanwhile, the optimized size design of the hub, the stator core design (the optimized and improved tooth space size of the stator core), the permanent magnet style (the permanent magnet on the magnetic conduction ring is rearranged), the matching of the slot pole matching and the direct punching winding process optimize the motor structure, so that the motor has high efficiency and reliability in operation, better cost performance and improved motor performance, thereby having more compact and portable motor structure and lower cost; the output torque is large, and the power is more abundant; the vibration noise is less, and (e.g., riding) is more comfortable.

It should be understood that all of the above preferred embodiments are exemplary and not restrictive, and that various modifications and changes in the specific embodiments described above, which may occur to those skilled in the art upon reading the teachings of the present invention, are intended to be within the scope of the appended claims.

Claims

1. An in-wheel motor assembly (200), in-wheel motor assembly (200) has wheel and in-wheel motor, in-wheel motor install in the wheel, the wheel has wheel hub (1), sideshield (2), lid (5) of stopping, in-wheel motor has main shaft (3) and stator (4), wheel hub (1) has magnetic ring (13), wherein, sideshield (2) are arranged within magnetic ring (13) in one side of magnetic ring (13) and lid (5) of stopping are arranged within magnetic ring (13) in the other side of magnetic ring (13), stator (4) suit is on main shaft (3) and main shaft (3) are connected to and pass sideshield (2) and lid (5) of stopping, stator (4) are arranged in the accommodation space that constitutes by sideshield (2) and lid (5) of stopping,

it is characterized in that the preparation method is characterized in that,

the inner diameter of the magnetic conductive ring (13) is 218-225 mm, and the thickness of the magnetic conductive ring (13) is 3.5-7.5 mm.

2. The in-wheel motor assembly (200) according to claim 1, characterized in that the wheel hub (1) further has permanent magnets (14), the permanent magnets (14) being arranged inside the magnetic conductive ring (13), wherein the permanent magnets (14) are configured as rectangles, concentric sectors or non-concentric sectors.

3. The in-wheel motor assembly (200) of claim 1, wherein the stator (4) is provided with a stator core (43), a plurality of stator teeth are configured on the periphery of the stator core (43), and stator slots are respectively formed between the adjacent stator teeth, wherein the width of the slot opening of each stator slot is 2.0-2.5 mm.

4. The in-wheel motor assembly (200) of claim 2, characterized in that the wheel hub (1) further has a wheel rim (11), the magnetic conductive ring (13) is arranged inside the wheel rim (11), the outer diameter of the wheel rim (11) is 265-275 mm, the nominal diameter of the wheel rim (11) is 254 ± 2mm, the inner diameter of the wheel rim (11) is 225-240 mm, and/or the thickness of the permanent magnet (14) is 1.8-3 mm.

5. The in-wheel motor assembly (200) of claim 2, wherein the permanent magnets (14) are sequentially attached to the inner side of the magnetic conduction ring (13) in a north-south pole alternating manner.

6. The in-wheel motor assembly (200) of claim 2, characterized in that the permanent magnets (14) are the same size and are evenly distributed inside the magnetic conductive ring (13), and the number of the permanent magnets (14) is 48 or 60.

7. The in-wheel motor assembly (200) of claim 3, wherein the outer diameter of the stator core (43) is 211-220.4 mm, the width of the stator teeth of the stator core (43) is 5.0-5.5 mm, and the width of the yoke part of the stator core (43) is 4.0-5.0 mm.

8. The in-wheel motor assembly (200) of claim 3, wherein 54 stator teeth are configured on the periphery of the stator core (43), and the tooth top profile of the stator teeth is linear.

9. The in-wheel motor assembly (200) of claim 1, wherein the brake cover (5) is configured as a hub brake cover.

10. A wheel assembly having a tyre, characterised in that it further has a hub motor assembly (200) according to any one of claims 1-9, wherein the tyre is fitted over a rim (11) of the hub (1).

11. A vehicle having a wheel assembly according to claim 10.