CN209938306U - Two fender speed change systems of external rotor wheel hub motor and electric automobile based on two electromagnetic brake - Google Patents

Abstract

The utility model discloses an external rotor wheel hub motor keeps off variable speed system two based on two electromagnetic braking wares, it mainly comprises external rotor wheel hub motor, parallel key, knuckle, round nut, gearbox housing, screw, electromagnetic braking ware No. 1, electromagnetic braking ware No. 2, planetary gear train, tire, rim bolt, rim nut, wheel hub and axle head bolt. The utility model also discloses an electric automobile, it has satisfied electric automobile to many-sided demands such as dynamic property, economic nature, has improved electric automobile's comprehensive properties, when realizing the function of shifting, this external rotor in-wheel motor two keep off speed change system still has the function of parking braking concurrently.

Description

A two-speed speed change system for an outer rotor hub motor based on double electromagnetic brakes and its electric moving car

technical field

The utility model relates to the field of electric vehicles, in particular to an outer rotor wheel hub motor two-speed shifting system based on double electromagnetic brakes and an electric vehicle.

Background technique

The rapid development of automobile industry has changed people's way of life to a great extent and improved people's quality of life. While bringing a lot of convenience to people, automobiles also bring a lot of negative effects: a large amount of non-renewable energy such as oil and natural gas is consumed, a large amount of toxic and harmful gases such as carbon monoxide and nitrogen oxides and greenhouse gases such as carbon dioxide are emitted, and a large amount of noise is generated. It has brought immeasurable harm to people's living environment. Today, the worldwide energy crisis and environmental problems are becoming more and more serious, and the number of cars in the world is increasing year by year, and the above problems will be more severe. Therefore, today's automobile industry is bound to seek the development direction of low noise, zero emission, and comprehensive utilization of energy. It has become an inevitable choice of the times to develop new energy vehicles that are different from traditional vehicles. Electric vehicles are the most important form of new energy vehicles. The electric energy they consume is secondary energy, which can be obtained in various ways, avoiding excessive consumption of primary energy. At the same time, electric vehicles have the advantages of being comfortable and clean, low noise, non-polluting the environment, simple and reliable operation, and low cost of use. They are called green vehicles and are truly zero-pollution and zero-emission vehicles. Therefore, electric vehicles are an inevitable product of the trend of sustainable economic development and the ultimate trend of automobile development.

According to the different ways of motor-driven wheels, electric vehicles can be divided into centralized motor drive form and electric wheel drive form; the power transmission of centralized motor drive form generally needs to be transmitted to the drive wheels through transmissions, differentials, universal transmissions, etc. The driving form has complex structure, low transmission efficiency, and the wheels cannot be independently controlled. However, in the electric wheel-driven vehicle, the motor can be directly installed on the driving wheel or near the driving wheel. The driving system is simple, compact in structure, takes up less space, and has high transmission efficiency. Therefore, while pursuing energy saving and environmental protection, the electric wheel vehicle also maximizes the comprehensive performance of the vehicle and meets people's needs for driving pleasure. Therefore, electric wheel vehicles are one of the mainstream development trends of electric vehicles; at present, electric vehicles in the form of electric wheel drive generally do not have a transmission, and generally drive the wheels directly through the in-wheel motor, or set a reducer between the drive motor and the wheel, using In the form of wheel drive, the wheels are driven after deceleration and torque increase, but the speed ratio of the reducer is fixed. Therefore, whether it is in-wheel motor drive or in-wheel drive, the electric wheel system only has a fixed speed ratio, and the speed ratio cannot be reasonably switched according to the actual driving conditions of the electric vehicle, so as to meet the dynamic performance of the electric vehicle in the form of electric wheel drive. and economical requirements. Therefore, in order to take into account the power and economy of electric vehicles, it is very necessary to match transmissions for electric wheel-driven electric vehicles.

Utility model content

The utility model designs and develops a two-speed gear shifting system for an outer rotor hub motor based on double electromagnetic brakes. The purpose of the utility model is to perform gear shifting operations through the double electromagnetic brakes, so as to satisfy the driver's requirement for shifting the transmission to the transmission according to the actual driving conditions of the electric vehicle. It can switch between different gears, and at the same time, its response speed is fast, and the shifting process is completed in an instant, which overcomes the technical defects of complex shifting process and poor response characteristics of the existing electric wheel-driven electric vehicle two-speed transmission.

The utility model designs and develops an electric vehicle, which meets the demands of the electric vehicle for power performance, economy and other aspects by using the outer rotor hub motor two-speed shifting system based on double electromagnetic brakes, and improves the comprehensive performance of the electric vehicle. While realizing the shifting function, the outer rotor hub motor two-speed transmission system also has the function of parking brake.

The technical scheme provided by the utility model is:

A two-speed transmission system for an outer rotor hub motor based on double electromagnetic brakes, comprising:

In-wheel motor housing;

a motor shaft, which rotatably passes through the center of both sides of the motor housing, and has a central hole at the passing end of the motor shaft;

a first electromagnetic brake housing, which is fixedly connected with the passing end of the motor shaft, and a first annular groove is arranged in the circumferential direction of the first electromagnetic brake, and the radial inner side of the first annular groove is along the The first blind holes are evenly distributed in the circumferential direction;

a first excitation coil, which is arranged in the first annular groove;

a first magnetic yoke, which is arranged in a gap with the first excitation coil;

a first spring, which is arranged in the first blind hole, one end is arranged in conflict with the bottom of the first blind hole, and the other end is fixedly connected with the first magnetic yoke;

a second electromagnetic brake shaft, which is rotatably supported in the central hole;

The second electromagnetic brake housing is rotatably supported on the second electromagnetic brake shaft, and is provided with a second annular groove in the circumferential direction of the second electromagnetic brake, and in the radial direction of the second annular groove Second blind holes are evenly distributed on the inner side along the circumferential direction;

a second excitation coil, which is arranged in the second annular groove;

a second magnetic yoke, which is arranged in a gap with the second excitation coil;

a second spring, which is arranged in the second blind hole, one end of which is arranged against the bottom of the second blind hole, and the other end is fixedly connected with the second magnetic yoke;

a friction disc, the gap of which is set between the first magnetic yoke and the second magnetic yoke, and the friction disc is fixedly connected to the second electromagnetic brake shaft;

Wherein, selectively electrifying and de-energizing the first excitation coil and the second excitation coil makes the friction disc selectively press against the first magnetic yoke or the second magnetic yoke.

Preferably, it also includes:

a transmission casing, which is fixedly connected with the in-wheel motor casing and the second electromagnetic brake casing;

a sun gear, which is fixedly connected with the second electromagnetic brake shaft;

a plurality of planetary gears meshed and matched with the sun gear;

a planet carrier cover, which is rotatably supported on the second electromagnetic brake shaft;

a planet carrier, which is rotatably supported on the transmission housing;

The ring gear is meshed and matched with the planetary gear, and the ring gear is fixedly connected with the transmission housing.

Preferably, it also includes:

a wheel hub, which is fixedly connected with the planet carrier;

a wheel rim, which is fixedly connected with the wheel hub;

A tire is fixedly connected to the rim.

Preferably, it also includes:

a first bushing inserted into the first electromagnetic brake housing through the first magnetic yoke;

A second bush is inserted into the second electromagnetic brake housing through the second yoke.

Preferably, it also includes:

A plurality of friction linings are symmetrically inlaid on both sides of the friction disc.

Preferably, the in-wheel motor housing includes a first housing and a second housing; and

Also includes:

an outer rotor fixedly installed between the end faces of the first casing and the second casing;

a permanent magnet fixed on the outer rotor;

a stator, which is fixed and mounted on the motor shaft;

windings, which are fixed on the stator.

Preferably, the motor shaft axially limits the first electromagnetic brake housing through a first snap ring; and

The sun gear is axially limited on the second electromagnetic brake shaft through a second snap ring.

Preferably, it also includes:

The steering knuckle is fixedly connected with the motor shaft, and the steering knuckle is fixedly connected with the vehicle body through the suspension.

Preferably, there are cylindrical shafts on both sides of the planetary wheel;

the planet carrier and the planet carrier cover have radially outer circular holes;

Wherein, the cylindrical shaft and the radially outer circular hole are matched and installed.

An electric vehicle uses the dual electromagnetic brake-based outer rotor hub motor two-speed transmission system.

Compared with the prior art, the present utility model has the following beneficial effects:

1. The two-speed transmission system of the outer rotor hub motor based on the double electromagnetic brakes provided by the present invention has small axial dimensions, small occupied space, simple structure, compact and reasonable layout, and is convenient for the arrangement inside or near the wheel;

2. The two-speed speed change system of the outer rotor hub motor based on the double electromagnetic brakes provided by the present utility model, the two electromagnetic brakes share a friction disc, which reduces the number of parts and has the characteristics of a high degree of integration;

3. The two-speed gear shifting system of the outer rotor hub motor based on the double electromagnetic brakes provided by the present utility model, the gear shifting process can be automatically completed only by controlling the on-off of the two electromagnetic brakes, and the gear shifting process is only a few tens of milliseconds, and the response Quick and good response characteristics;

4. The two-speed transmission system of the outer rotor in-wheel motor based on the double electromagnetic brakes provided by the utility model can not only realize the gear switching of the automobile, but also has the function of parking brake, and has rich working modes, which can meet the various requirements of the automobile. need.

Description of drawings

FIG. 1 is a schematic diagram of the mechanical structure of the two-speed transmission system of the outer rotor hub motor based on the double electromagnetic brake according to the present invention.

FIG. 2 is a schematic diagram of the structure and principle of the two-speed speed change system of the outer rotor hub motor based on the double electromagnetic brake according to the present invention.

FIG. 3 is a schematic diagram of the power transmission route when the two-speed transmission system of the outer rotor hub motor based on the double electromagnetic brake according to the present invention is in a forward first gear state.

4 is a schematic diagram of the power transmission route when the two-speed transmission system of the outer rotor hub motor based on the dual electromagnetic brakes according to the present invention is in a forward second-speed state.

Detailed ways

The present utility model will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can refer to the text of the description to implement it accordingly.

As shown in FIG. 1 , the present invention provides a two-speed speed change system for an outer rotor hub motor based on double electromagnetic brakes. The brake is used to shift gears, so that the driver can switch the transmission between different gears according to the actual driving conditions of the electric vehicle, so as to adapt to the different driving conditions of the electric vehicle. , overcomes the technical defects of complex shifting process and poor response characteristics of the existing electric wheel drive electric vehicle two-speed transmission, meets the needs of electric vehicles for power, economy and other aspects, and improves the comprehensive performance of electric vehicles. While realizing the shifting function, the outer rotor hub motor two-speed transmission system also has the function of parking brake.

The two-speed speed change system of the outer rotor hub motor based on the double electromagnetic brake provided by the present invention mainly consists of the outer rotor hub motor 100, the transmission housing 113, the No. 1 electromagnetic brake 200, the No. 2 electromagnetic brake 300, the planetary gear train 400, the tires 501 , rim 502 and hub 505 are formed.

The outer rotor hub motor 100 includes a left motor housing 101, an outer rotor 102, a permanent magnet 103, a motor right housing 104, a No. 1 bearing 105, a No. 2 bearing 106, a motor shaft 107, a stator 108 and a winding 109;

The outer rotor 102 is fixedly clamped in the end face ring groove between the left casing 101 of the motor and the right casing 104 of the motor, and the three are fixedly connected as a whole, the permanent magnet 103 is fixed on the outer rotor 102, and the screw 114 The casing 113 is integrally connected with the outer rotor 102 and the right casing 104 of the motor; the casing 101 on the left side of the motor and the casing 104 on the right side of the motor are supported on the motor shaft 107 by the No. 1 bearing 105 and the No. 2 bearing 106 respectively, The winding 109 is fixed on the stator 108, and the stator 108 and the motor shaft 107 are connected by spline connection; the No. 1 bearing 105 and the stator 108 are axially limited by the shoulder of the motor shaft 107, and the No. 2 bearing is carried out by the stator 108. Axial limit; the steering knuckle 111 is fixedly connected to the vehicle body through the suspension so as to be fixed, the steering knuckle 111 is connected with the motor shaft 107 through the flat key 110, so that the motor shaft 107 is circumferentially fixed, and the left end of the motor shaft 107 is connected with the round nut 112 is threaded, and the right end face of the round nut 112 is in contact with the left end face of the steering knuckle 111, and the right end face of the steering knuckle 111 is in contact with the left end face of the inner ring of the No. 1 bearing 105, thereby axially fixing the outer rotor hub motor 100.

The No. 1 electromagnetic brake 200 is located on the right side of the outer rotor hub motor 100, including the No. 1 excitation coil 201, the friction lining 202, the No. 1 spring 203 uniformly distributed along the circumferential direction, and the friction disc screws 204 and No. 1 uniformly distributed along the circumferential direction. The electromagnetic brake housing 205, the first snap ring 206, the friction disc 207, the No. 1 electromagnetic brake bolts 208 evenly distributed along the circumferential direction, the No. 1 bushing 209 and the No. 1 yoke 210 matched with the No. 1 electromagnetic brake bolt 208;

Among them, the No. 1 electromagnetic brake housing 205 and the motor shaft 107 are fixedly connected by a spline connection, and the motor shaft 107 axially limits the No. 1 electromagnetic brake housing 205 through the splined shaft shoulder and the first snap ring 206; A group of No. 1 excitation coils 201 is wound in the annular groove of No. 1 electromagnetic brake housing 205. An air gap is left between No. 1 excitation coil 201 and No. 1 magnetic yoke 210. The blind hole of the cloth, the No. 1 spring 203 is arranged in the blind hole, and one end of the No. 1 spring 203 is embedded in the bottom of the blind hole, and the other end is bonded and fixed with the end face of the No. 1 yoke 210; the annular groove of the No. 1 electromagnetic brake housing 205 The opening direction of the hole and the blind hole are to the right; the No. 1 bushing 209 passes through the No. 1 magnetic yoke 210 and is embedded in the No. 1 electromagnetic brake housing 205, and the No. 1 electromagnetic brake bolt 208 passes through the No. 1 bushing 209 and is screwed. The No. 1 electromagnetic brake housing 205 is inserted into the No. 1 electromagnetic brake housing 205, so that the No. 1 electromagnetic brake housing 205 and the No. 1 yoke 210 are fixedly connected, and the No. 1 yoke 210 can move axially along the No. 1 bushing 209; It can avoid the wear of the No. 1 electromagnetic brake bolt 208 during the axial movement of the No. 1 magnetic yoke 210, and can also ensure the minimum air gap between the No. 1 excitation coil 201 and the No. 1 magnetic yoke 210;

The No. 2 electromagnetic brake 300 is located on the right side of the No. 1 electromagnetic brake 200, including No. 2 bushings 301 uniformly distributed along the circumferential direction, No. 2 electromagnetic brake bolts 302 and nuts 303 matched with the No. 2 bushing 301, and uniformly distributed along the circumferential direction. The No. 2 spring 304, the No. 2 electromagnetic brake shaft 305, the No. 3 bearing 306, the No. 2 electromagnetic brake housing 307, the No. 2 excitation coil 308, the No. 2 yoke 309, the needle roller bearing 310 and the washer 311;

The friction disc 207 is located between the No. 1 magnetic yoke 210 and the No. 2 magnetic yoke 309 , the No. 1 electromagnetic brake 200 and the No. 2 electromagnetic brake 300 share the friction disc 207 , and the left and right sides of the friction disc 207 are inlaid with friction linings 202. There is a disc on the left side of the No. 2 electromagnetic brake shaft 305, and the friction disc 207 is fixedly connected with the left disc of the No. 2 electromagnetic brake shaft 305 by the friction disc screw 204; The left end of the brake shaft 305 extends into the center hole, and a needle roller bearing 310 is arranged between the motor shaft 107 and the No. 2 electromagnetic brake shaft 305 for support, and a washer 311 is arranged on the No. 2 electromagnetic brake shaft 305 to axially carry out the friction disc 207. Limit; the No. 3 bearing 306 is arranged between the No. 2 electromagnetic brake housing 307 and the No. 2 electromagnetic brake shaft 305 for support, and the disk shoulder of the No. 2 electromagnetic brake shaft 305 axially limits the No. 3 bearing 306; A group of No. 2 excitation coils 308 is wound in the annular groove of No. 2 electromagnetic brake housing 307, and an air gap is left between No. 2 excitation coil 308 and No. 2 magnetic yoke 309. The blind hole of the cloth, the No. 2 spring 304 is arranged in the blind hole, and one end of the No. 2 spring 304 is embedded in the bottom of the blind hole, and the other end is bonded and fixed with the end face of the No. 2 yoke 309; the annular groove of the No. 2 electromagnetic brake housing 307 The opening direction of the blind hole and the blind hole are both to the left, the No. 2 bushing 301 passes through the No. 2 yoke 309 and is embedded in the No. 2 electromagnetic brake housing 307, and the No. 2 electromagnetic brake bolt 302 passes through the No. 2 bushings 301, 2 No. 2 electromagnetic brake housing 307 and transmission housing 113, and the No. 2 electromagnetic brake housing 307, No. 2 magnetic yoke 309 and transmission housing 113 are fixedly connected through nut 303, No. 2 magnetic yoke 309 can be along the No. 2 bushing 301 Axial movement; the No. 2 bushing 301 can prevent the No. 2 electromagnetic brake bolt 302 from being worn during the axial movement of the No. 2 yoke 309, and can also ensure that the No. 2 excitation coil 308 and the No. 2 yoke 309 are connected Minimum air gap between.

The planetary gear train 400 is a single-row and single-stage planetary gear train, which is located on the right side of the No. 2 electromagnetic brake 300, and mainly includes a planetary gear 401, a sun gear 402, a second snap ring 403, a No. 4 bearing 404, a planet carrier cover 405, and a planetary gear 401. Carrier 406, planet carrier fastening screws 407, ring gear 408 and No. 5 bearing 409;

Among them, the sun gear 402 and the No. 2 electromagnetic brake shaft 305 are fixedly connected by splines, and the sun gear 402 is axially limited by the second snap ring 403, and the No. 2 electromagnetic brake bolts 302 and nuts 303 connect the inner gear 408 to the ring gear 408. The transmission housing 113 is fixedly connected, and the planetary gear 401 protrudes from the cylindrical shaft to both sides, and extends into the radial outer circular holes of the planetary carrier cover 405 and the planetary carrier 406 and can rotate freely. The planetary carrier cover 405 and the planetary carrier 406 They are fixedly connected by the planet carrier fastening screws 407, the No. 4 bearing 404 is arranged between the planet carrier cover 405 and the No. 2 electromagnetic brake shaft 305 for support, and is axially limited by the shoulder on the left side of the No. 4 bearing 404. bit;

The planet carrier 406 extends to the right to form a hollow shaft, and the outer diameter of the right end of the hollow shaft is splined and connected with the inner hole of the hub 505. Support, and axially limit the No. 5 bearing 409 through the shoulder of the hollow shaft of the planet carrier 406; the hollow shaft of the hub 505 extends into the center hole of the rim 502, and the rim bolt 503 and the rim nut 504 connect the hub 505 to the rim 502. The rim 502 is fixedly connected with the tire 501; the right end of the hollow shaft of the planet carrier 406 is machined with internal threads, the shaft end bolt 506 is screwed into the hollow shaft of the planet carrier 406, and the left end face of the shaft end bolt 506 is connected to the right end of the hub 505. surface contact, so as to axially fix the hub 505;

In this embodiment, as a preference, the planetary row characteristic parameter of the planetary gear train 400 is greater than 1, and the planetary row characteristic parameter is generally defined in the mechanical field, which refers to the ratio of the number of teeth of the ring gear to the sun gear in the planetary geartrain .

In the assembling process of the present invention, the outer rotor hub motor 100, the transmission housing 113, the screws 114, the No. 1 electromagnetic brake 200, the No. 2 electromagnetic brake 300 and the planetary gear train 400 are used as a power assembly. The motor shaft 107 is fixedly connected to the steering knuckle 111 , and is fixedly connected to the wheel rim 502 and the wheel hub 505 through the hollow shaft of the planet carrier 406 extending from the right end.

As shown in Fig. 2, the main connection relationship of the described two-speed speed change system of the outer rotor hub motor based on the double electromagnetic brakes is shown; Mode: forward first gear status; forward second gear status; reverse gear status; parking brake status;

The working principles of the four modes are described below: in terms of the speed relationship, the rotation direction of the wheels of the electric vehicle is set to be the positive direction when moving forward, and the rotation direction of the wheels is the negative direction when reversing;

1. Forward first gear state: When the electric vehicle is in the forward first gear state, the No. 1 excitation coil 201 is powered off, and the No. 2 excitation coil 308 is energized; at this time, the No. 2 excitation coil 308 attracts the No. 2 yoke 309 along the No. 2 The bushing 301 moves axially, eliminating the pressing force between the No. 2 yoke 309 and the friction disc 207; the No. 1 yoke 210 is pressed against the friction disc 207 under the action of the No. 1 spring 203, so that the No. 1 magnetic yoke 210 is pressed against the friction disc 207. The yoke 210 is engaged with the friction disc 207; the friction disc 207 is fixed, the sun gear 402 is fixed, the outer rotor hub motor 100 outputs a forward torque, the outer rotor 102 and the transmission housing 113 rotate forward synchronously, and it is assumed that at this time The rotational speed of the outer rotor 102 and the transmission housing 113 is n, then the rotational speed of the ring gear 408 is n. Since the sun gear 402 is fixed, its rotational speed is 0. According to the rotational speed formula of the single-row and single-stage planetary gear train, it can be The rotational speed of the planet carrier 406 is obtained as (k is the characteristic parameter of the planetary row of the planetary gear train 400, and k>1), then the rotational speeds of the hub 505, the rim 502 and the tire 501 are all

Therefore, as shown in FIG. 3 , when the electric vehicle is in the first forward gear state, the power passes through the outer rotor 102 , the transmission housing 113 , the ring gear 408 , the planetary gear 401 , the planet carrier 406 , the hub 505 , the rim bolt 503 , The rim 502 is transmitted to the tire 501, thereby driving the electric vehicle to drive forward; at this time, the first gear ratio of the two-speed transmission system of the outer rotor hub motor is

2. Forward second gear state: When the electric vehicle is switched from the forward first gear state to the forward second gear state, the No. 1 excitation coil 201 is energized, and the No. 2 excitation coil 308 is de-energized; at this time, the No. 1 excitation coil 201 attracts No. 1 magnetic The yoke 210 moves axially along the No. 1 bushing 209, eliminating the pressing force between the No. 1 yoke 210 and the friction disc 207; the No. 2 yoke 309 is pressed against the friction disc under the action of the No. 2 spring 304 207, the No. 2 yoke 309 is engaged with the friction disc 207; the friction disc 207 is fixedly connected with the transmission housing 113, then the sun gear 402 is fixedly connected with the transmission housing 113; the outer rotor hub motor 100 outputs the forward torque, the outer rotor 102 and the transmission housing 113 are rotating forward, and assume that the rotational speed of the outer rotor 102 and the transmission housing 113 is n, then the rotational speeds of the sun gear 402 and the ring gear 408 are both n. According to the rotational speed of the single-row single-stage planetary gear train Formula, the rotational speed of the planet carrier 406 can be obtained as n, then the rotational speed of the hub 505, the rim 502 and the tire 501 are all n;

Therefore, as shown in FIG. 4 , when the electric vehicle is in the second forward gear state, the power sequentially passes through the outer rotor 102 , the transmission housing 113 , the ring gear 408 , the sun gear 402 , the planetary gear 401 , the planet carrier 406 , the hub 505 , The rim bolt 503 and the rim 502 are transmitted to the tire 501, thereby driving the electric vehicle to drive forward; at this time, the second gear ratio of the two-speed transmission system of the outer rotor hub motor is 1, that is, the second gear is a direct gear.

3. Reverse gear state: when the electric vehicle is in reverse gear state, it is only necessary to make the outer rotor hub motor 100 output negative torque and the outer rotor 102 to reverse the direction. It is exactly the same and will not be repeated here.

4. Parking brake status: When the electric vehicle stops running and performs parking braking, the No. 1 excitation coil 201 and the No. 2 excitation coil 308 are both powered off; at this time, the No. 1 yoke 210 acts on the No. 1 spring 203 Press down on the friction disc 207, so that the No. 1 yoke 210 is engaged with the friction disc 207; the friction disc 207 is fixed, and the sun gear 402 is fixed; the No. 2 yoke 309 is also pressed against the friction under the action of the No. 2 spring 304 disc 207, the No. 2 yoke 309 is engaged with the friction disc 207, so the No. 2 yoke 309 is also fixed, thereby preventing the transmission housing 113 and the ring gear 408 from rotating, and further preventing the planet carrier 406 from rotating, thereby preventing the rim 502. and tire 501 turns.

Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the description and the embodiments, and can be applied to various fields suitable for the present invention. For those skilled in the art, Additional modifications may readily be implemented, therefore, the invention is not limited to the specific details and illustrations shown and described herein without departing from the general concept defined by the appended claims and the scope of equivalents.

Claims (10)

1. The utility model provides an outer rotor in-wheel motor keeps off variable speed system two which is characterized in that based on two electromagnetic brake includes:

a hub motor housing;

a motor shaft rotatably passing through centers of both sides of the motor housing and having a center hole at a passing-out end thereof;

the first electromagnetic brake shell is fixedly connected with the penetrating end of the motor shaft, a first annular groove is formed in the circumferential direction of the first electromagnetic brake, and first blind holes are uniformly distributed in the radial inner side of the first annular groove along the circumferential direction;

a first field coil disposed within the first annular groove;

a first yoke disposed with a gap from the first field coil;

the first spring is arranged in the first blind hole, one end of the first spring is abutted against the bottom of the first blind hole, and the other end of the first spring is fixedly connected with the first magnetic yoke;

a second electromagnetic brake shaft rotatably supported within the central bore;

the second electromagnetic brake shell is rotatably supported on the second electromagnetic brake shaft, a second annular groove is formed in the second electromagnetic brake in the circumferential direction, and second blind holes are uniformly distributed in the radial inner side of the second annular groove along the circumferential direction;

a second field coil disposed within the second annular groove;

a second yoke disposed with a gap from the second exciting coil;

the second spring is arranged in the second blind hole, one end of the second spring is abutted against the bottom of the second blind hole, and the other end of the second spring is fixedly connected with the second magnetic yoke;

a friction disc, a gap of which is provided between the first yoke and the second yoke, and which is fixedly connected with the second electromagnetic brake shaft;

wherein selective energizing and de-energizing of the first field coil and the second field coil causes the friction disk to selectively compress against the first yoke or the second yoke.

2. An external rotor in-wheel motor two-gear speed change system based on a double electromagnetic brake as claimed in claim 1, further comprising:

a transmission housing fixedly connected with the hub motor housing and the second electromagnetic brake housing;

a sun gear fixedly connected with the second electromagnetic brake shaft;

a plurality of planet gears in meshing engagement with the sun gear;

a carrier cover rotatably supported on the second electromagnetic brake shaft;

a carrier rotatably supported on the transmission housing;

and the inner gear ring is meshed and matched with the planet gears and is fixedly connected with the transmission shell.

3. An external rotor in-wheel motor two-gear speed change system based on a double electromagnetic brake as claimed in claim 2, further comprising:

the hub is fixedly connected with the planet carrier;

a rim fixedly connected with the hub;

a tire fixedly connected with the rim.

4. An external rotor in-wheel motor two-gear speed change system based on a double electromagnetic brake as claimed in claim 3, further comprising:

a first bushing inserted into the first electromagnetic brake housing through the first yoke;

a second bushing embedded in the second electromagnetic brake housing through the second yoke.

5. An external rotor in-wheel motor two-gear speed change system based on a double electromagnetic brake as claimed in claim 4, further comprising:

and the friction linings are symmetrically embedded on two sides of the friction disc.

6. An outer rotor hub motor two-speed change system based on a double electromagnetic brake as claimed in any one of claims 2-5, wherein the hub motor housing comprises a first housing and a second housing; and

further comprising:

an outer rotor fixedly mounted between the first housing and the second housing end face;

a permanent magnet fixed on the outer rotor;

a stator fixedly mounted on the motor shaft;

a winding fixed to the stator.

7. An outer rotor hub motor two-gear speed change system based on a double electromagnetic brake as claimed in claim 6, wherein the motor shaft axially limits the first electromagnetic brake housing through a first snap ring; and

the sun gear is axially limited on the second electromagnetic brake shaft through a second snap ring.

8. An external rotor in-wheel motor two-gear speed change system based on a double electromagnetic brake as claimed in claim 7, further comprising:

and the steering knuckle is fixedly connected with the motor shaft and is fixedly connected with a vehicle body through a suspension.

9. The two-gear speed change system of the external rotor hub motor based on the double electromagnetic brake as claimed in claim 8, wherein the planetary gear is provided with a cylindrical shaft at two sides;

the planet carrier and the planet carrier cover are provided with radial outer side round holes;

and the cylindrical shaft and the radial outer round hole are installed in a matching manner.

10. An electric vehicle, characterized in that an external rotor in-wheel motor two-gear speed change system based on a dual electromagnetic brake as claimed in claims 1-9 is used.

Images