Highly integrated inner rotor hub motor two-speed transmission system and electric vehicle

Abstract

The present invention discloses a highly integrated inner rotor hub motor two-speed transmission system, which is mainly composed of an inner rotor hub motor, a steering knuckle, a fastening screw, a transmission annular housing, a transmission right housing, screws, a first planetary gear train, a second planetary gear train, a No. 1 electromagnetic brake, a No. 2 electromagnetic brake, a tire, a rim, a rim bolt, a rim nut, a wheel hub, an axle end bolts, a brake disc and a brake caliper. The present invention also discloses an electric vehicle, which meets the electric vehicle's requirements for power, economy and other aspects, improves the comprehensive performance of the electric vehicle, and while realizing the shifting function, the highly integrated inner rotor hub motor two-speed transmission system also has the function of parking brake.

Description

Technical Field

[0001] The present invention relates to the field of electric vehicles, and in particular to a highly integrated inner rotor hub motor two-speed transmission system and a vehicle. Background Art

[0002] The rapid development of the automobile industry has greatly changed people's lifestyles and improved their quality of life. While cars bring many conveniences to people, they also bring many 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 are emitted, and greenhouse gases such as carbon dioxide are emitted, and a large amount of noise is generated, which brings immeasurable harm to people's living environment. Nowadays, the energy crisis and environmental problems around the world are becoming more and more serious. Moreover, 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. The development of new energy vehicles that are different from traditional cars has become an inevitable choice of the times. Electric vehicles are the main form of new energy vehicles. The electricity they consume is secondary energy, which can be obtained in a variety of ways, avoiding excessive consumption of primary energy. At the same time, electric vehicles have the advantages of comfort, cleanliness, low noise, no pollution to the environment, simple and reliable operation, and low cost of use. They are called green cars and are truly zero-pollution and zero-emission cars. Therefore, electric vehicles are the inevitable product of the trend of sustainable economic development and the ultimate trend of automobile development.

[0003] According to the different ways in which the motor drives the wheels, electric vehicles can be divided into centralized motor drive and electric wheel drive. The power transmission of the centralized motor drive generally needs to be transmitted to the drive wheel through the transmission, differential, universal transmission device, etc. The drive structure is complex, the transmission efficiency is low, and the wheels cannot be controlled independently. For cars with electric wheel drive, the motor can be directly installed on or near the drive wheel. The drive system is simple, the structure is compact, the space occupied is small, the transmission efficiency is high, and each electric wheel can be independently controlled. Therefore, while pursuing energy conservation and environmental protection, electric wheel cars also maximize the comprehensive performance of the vehicle and meet people's needs for driving pleasure. Therefore, electric wheel cars are one of the mainstream development trends of electric vehicles. Electric wheel drive can be mainly divided into wheel-side drive and wheel hub motor drive. The power source of the wheel-side drive generally uses an inner rotor motor, and a reducer is arranged between the inner rotor motor and the wheel to play a role in reducing speed and increasing torque, but the speed ratio of the reducer is fixed; the power source of the wheel hub motor drive generally uses an outer rotor motor, and the outer rotor of the outer rotor motor is fixedly connected to the wheel, thereby directly driving the wheel, and its transmission ratio is 1. Therefore, the traditional electric wheel drive system, whether it is wheel-side drive or wheel hub motor drive, has only one fixed speed ratio, and cannot reasonably switch the speed ratio according to the actual driving conditions of the electric vehicle to meet the requirements of the electric wheel drive electric vehicle for power and economy. Therefore, in order to take into account the power and economy of electric vehicles, it is very necessary to match the transmission for electric wheel drive electric vehicles. Summary of the invention

[0004] The present invention designs and develops a highly integrated inner rotor hub motor two-speed transmission system, which is equipped with an inner rotor hub motor as a power source, and two planetary gear trains are arranged to reduce speed and increase torque. The invention aims to perform shifting operations through two electromagnetic brakes to satisfy the driver's need to switch the transmission between different gears according to the actual driving conditions of the electric vehicle. At the same time, the response speed is fast, and the shifting process is completed instantly, overcoming the technical defects of the existing two-speed transmission of the electric wheel drive electric vehicle, which has a complex shifting process and poor response characteristics.

[0005] The present invention designs and develops an electric vehicle, which meets the electric vehicle's requirements for power, economy and other aspects by using a highly integrated inner rotor hub motor two-speed transmission system, thereby improving the comprehensive performance of the electric vehicle. While realizing the shifting function, the highly integrated inner rotor hub motor two-speed transmission system also has the function of parking brake.

[0006] The technical solution provided by the present invention is:

[0007] Highly integrated inner rotor hub motor two-speed transmission system, including:

[0008] Hub motor housing;

[0009] A motor shaft, which is rotatably supported at the center of both sides of the wheel hub motor housing, and the output end of the motor shaft extends out of the wheel hub motor housing;

[0010] A first sun gear, which is fixedly connected to the output end of the motor shaft;

[0011] A plurality of first planetary gears meshingly matched with the first sun gear;

[0012] A first inner gear ring, which meshes and matches with the first planetary gear, and the first inner gear ring is fixedly connected to the hub motor housing;

[0013] A first planet carrier, which is provided with a stepped hollow shaft and is rotatably supported on the motor shaft;

[0014] A first planet carrier cover, which is rotatably supported on the motor shaft, and the first planet carrier cover is fixedly connected to the first planet carrier;

[0015] a second sun gear, which is fixedly connected to the first planet carrier;

[0016] A plurality of second planetary gears meshingly matched with the second sun gear;

[0017] A second inner gear ring meshing with the second planetary gear;

[0018] Second planet carrier;

[0019] a second planet carrier cover rotatably supported on the first planet carrier, and the second planet carrier cover is fixedly connected to the second planet carrier;

[0020] A first electromagnetic brake housing, wherein the second inner gear ring is rotatably supported on the first electromagnetic brake housing, and a first annular groove is circumferentially arranged on the first electromagnetic brake housing, and first blind holes are uniformly distributed along the circumferential direction on the radial inner side of the first annular groove;

[0021] A first excitation coil, which is arranged in the first annular groove;

[0022] A first magnetic yoke, which is provided with a gap between itself and the first excitation coil;

[0023] a first spring, which is arranged in the first blind hole, with one end thereof being arranged to abut against the bottom of the first blind hole, and the other end thereof being fixedly connected to the first magnetic yoke;

[0024] A second electromagnetic brake housing is fixedly connected to the second planet carrier, and a second annular groove is circumferentially arranged on the second electromagnetic brake housing, and second blind holes are evenly distributed along the circumferential direction on the radial inner side of the second annular groove;

[0025] a second excitation coil, which is disposed in the second annular groove;

[0026] a second magnetic yoke, which is provided with a gap between itself and the second excitation coil;

[0027] a second spring, which is arranged in the second blind hole, and has one end thereof in conflict with the bottom of the second blind hole, and the other end thereof fixedly connected to the second magnetic yoke;

[0028] a friction disc, a gap of which is provided between the first magnetic yoke and the second magnetic yoke, and the friction disc is fixedly connected to the second inner gear ring;

[0029] The first excitation coil and the second excitation coil are selectively energized and deenergized, so that the friction disk is selectively pressed against the first magnetic yoke or the second magnetic yoke.

[0030] Preferably, it also includes:

[0031] A transmission housing, the transmission housing includes a first transmission housing and a second transmission housing, the first transmission housing is fixedly connected to the second transmission housing, and the first transmission housing is fixedly connected to the hub motor housing and the first electromagnetic brake housing, and the second planetary carrier is rotatably supported on the second transmission housing.

[0032] Preferably, it also includes:

[0033] a wheel hub, which is fixedly connected to the second planet carrier;

[0034] A brake disc fixedly connected to the wheel hub;

[0035] A rim, which is fixedly connected to the wheel hub;

[0036] A tire is fixedly connected to the rim.

[0037] Preferably, it also includes:

[0038] a first bushing passing through the first yoke and embedded in the first electromagnetic brake housing;

[0039] A second bushing passes through the second yoke and is embedded in the second electromagnetic brake housing.

[0040] Preferably, it also includes:

[0041] A plurality of friction linings are symmetrically inlaid on both sides of the friction disk.

[0042] Preferably, the hub motor housing comprises a first housing and a second housing, and the second housing is provided with a concave cavity, and the first sun gear, the first planetary gear, the first inner gear ring and the first planet carrier cover are arranged in the concave cavity; and

[0043] Also includes:

[0044] A stator housing, which is fixedly installed between the end faces of the first housing and the second housing;

[0045] A winding fixed on the stator housing;

[0046] An inner rotor, which is fixedly mounted on the motor shaft;

[0047] A permanent magnet is fixed on the inner rotor.

[0048] Preferably, the first planet carrier axially limits the first sun gear through a protrusion formed on the end surface of the first sun gear;

[0049] The second planet carrier axially limits the second sun gear through a protrusion formed on the end surface of the second sun gear;

[0050] The first electromagnetic brake housing axially limits the second inner gear ring through a washer.

[0051] Preferably, it also includes:

[0052] A steering knuckle, which is fixedly connected to the wheel hub motor housing, and the steering knuckle is fixedly connected to the vehicle body through a suspension;

[0053] A brake caliper is fixedly connected to the steering knuckle.

[0054] Preferably, the first planetary gear has cylindrical shafts on both sides;

[0055] The first planet carrier and the first planet carrier cover have radially outer circular holes;

[0056] Wherein, the cylindrical shaft of the first planetary wheel and the first planet carrier are matched and installed with the radial outer circular hole of the first planet carrier cover;

[0057] The second planetary gear has cylindrical shafts on both sides;

[0058] The second planet carrier and the second planet carrier cover have radially outer circular holes;

[0059] The cylindrical shaft of the second planetary gear and the second planet carrier are matched and installed with the radially outer circular hole of the second planet carrier cover.

[0060] An electric vehicle uses the highly integrated inner rotor hub motor two-speed transmission system.

[0061] Compared with the prior art, the present invention has the following beneficial effects:

[0062] 1. The highly integrated inner rotor hub motor two-speed transmission system provided by the present invention has a simple structure, a compact and reasonable layout, and is convenient for arrangement inside or near the wheel. The first planetary gear train is installed in the concave cavity of the right side housing of the motor, which occupies a small space and reduces the axial size of the entire transmission system.

[0063] 2. The highly integrated inner rotor hub motor two-speed transmission system provided by the present invention has two electromagnetic brakes that share one friction disk, thereby reducing the number of components and having a high degree of integration.

[0064] 3. The highly integrated inner rotor hub motor two-speed transmission system provided by the present invention can automatically complete the gear shifting process by simply controlling the on and off of two electromagnetic brakes. The gear shifting process takes only tens of milliseconds, with rapid response and good response characteristics.

[0065] 4. The highly integrated inner rotor hub motor two-speed transmission system provided by the present invention can not only realize the gear switching of the car, but also has the function of parking brake. It has rich working modes and can meet various needs of the car. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 It is a schematic diagram of the mechanical structure of the highly integrated inner rotor hub motor two-speed transmission system of the present invention.

[0067] Figure 2 This is a simplified diagram of the structural principle of the highly integrated inner rotor hub motor two-speed transmission system described in the present invention.

[0068] Figure 3 It is a schematic diagram of the power transmission route when the highly integrated inner rotor hub motor two-speed transmission system of the present invention is in the first forward gear state.

[0069] Figure 4 It is a schematic diagram of the power transmission route when the highly integrated inner rotor hub motor two-speed transmission system of the present invention is in the second forward gear state. DETAILED DESCRIPTION

[0070] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0071] like Figure 1As shown, the present invention provides a highly integrated inner rotor hub motor two-speed transmission system. The highly integrated inner rotor hub motor two-speed transmission system is equipped with an inner rotor hub motor as a power source, two planetary gear trains are arranged to reduce speed and increase torque, and two electromagnetic brakes are used for shifting, so that the driver can switch the transmission between different gears according to the actual driving conditions of the electric vehicle to adapt to different driving conditions of the electric vehicle. At the same time, the response speed is fast, and the gear shifting process is completed instantly, which meets the electric vehicle's requirements for power, economy and other aspects, and improves the comprehensive performance of the electric vehicle. While realizing the gear shifting function, the highly integrated inner rotor hub motor two-speed transmission system also has the function of parking brake.

[0072] The highly integrated inner rotor hub motor two-speed transmission system provided by the present invention is mainly composed of an inner rotor hub motor 100, a steering knuckle 110, a transmission annular housing 112, a transmission right housing 113, a first planetary gear train 200, a second planetary gear train 300, an electromagnetic brake No. 1 400, an electromagnetic brake No. 2 500, a tire 601, a rim 602, a hub 605, a brake disc 607 and a brake caliper 608.

[0073] The inner rotor hub motor 100 includes a motor left housing 101, a winding 102, a stator housing 103, a motor right housing 104, a No. 1 bearing 105, a No. 2 bearing 106, a motor shaft 107, an inner rotor 108 and a permanent magnet 109;

[0074] Among them, the stator housing 103 is fixedly mounted in the end face annular groove between the left side housing 101 of the motor and the right side housing 104 of the motor, and the three are fixedly connected as a whole. The winding 102 is fixed on the stator housing 103, and the middle part of the right side housing 104 of the motor shrinks to the left to form a concave cavity; the fastening screws 111 fix the stator housing 103, the right side housing 104 of the motor, the transmission annular housing 112 and the brake caliper 608 with the steering knuckle 110 together, the screws 114 fix the right side housing 113 of the transmission with the transmission annular housing 112, and the steering knuckle 110 is fixedly connected to the vehicle body through the suspension so that it is fixed. Therefore, the left side of the motor The housing 101, the stator housing 103, the right side housing 104 of the motor, the annular housing 112 of the transmission, the right side housing 113 of the transmission and the brake caliper 608 are all fixed; the left side housing 101 of the motor and the right side housing 104 of the motor support the motor shaft 107 through bearing No. 1 and bearing No. 2 respectively, the inner rotor 108 is splined to the motor shaft 107, and the permanent magnet 109 is fixed on the inner rotor 108; bearing No. 1 is axially limited by the inner rotor 108, the inner rotor 108 is axially limited by bearing No. 2, and bearing No. 2 is axially limited by the right side housing 104 of the motor.

[0075] The first planetary gear train 200 is a single-row single-stage planetary gear train, which is located in the concave cavity of the right housing 104 of the motor, and includes a first planetary gear 201, a No. 3 bearing 202, a needle bearing 203, a first sun gear 204, a first planet carrier 205, a first planet carrier fastening screw 206, a first planet carrier cover 207, a first inner gear ring 208 and a gear ring screw 209;

[0076] The first sun gear 204 is spline-connected to the motor shaft 107. The left end face of the first sun gear 204 contacts the shoulder end face of the motor shaft 107. A bulge is formed on the right side and contacts the first planet carrier 205, thereby limiting the axial position of the first sun gear 204. The first planet gear 201 extends a cylindrical shaft to both sides and extends into the radial outer circular holes of the first planet carrier 205 and the first planet carrier cover 207 and can rotate freely. The first planet carrier 205 and the first planet carrier cover 207 are connected by the first planet carrier fastening screws 20 6 fixedly connected; the first planet carrier 205 extends to the right to form a stepped hollow shaft, the hollow shaft of the first planet carrier 205 is supported on the motor shaft 107 through a needle bearing 203, and the needle bearing 203 is axially limited by the shoulder of the motor shaft 107; the first planet carrier cover 207 is supported on the motor shaft 107 through the No. 3 bearing 202, and the No. 3 bearing 202 is axially limited by the shoulder of the motor shaft 107; the first inner gear ring 208 is fixedly connected to the right housing 104 of the motor through the gear ring screw 209;

[0077] In this embodiment, as a preference, the planetary gear characteristic parameter of the first planetary gear system 200 is greater than 1. The planetary gear characteristic parameter is generally defined in the mechanical field and refers to the ratio of the number of teeth of the inner ring gear to the number of teeth of the sun gear in the planetary gear system.

[0078] The second planetary gear train 300 is a single-row single-stage planetary gear train, which is located on the right side of the first planetary gear train 200, and includes a second planetary gear 301, a No. 4 bearing 302, a second sun gear 303, a second planet carrier 304, a No. 5 bearing 305, a second planet carrier cover 306, a second inner gear ring 307, a second planet carrier fastening screw 308 and a washer 309;

[0079] The second sun gear 303 is spline-connected to the hollow shaft of the first planet carrier 205. The left end face of the second sun gear 303 contacts the shoulder end face of the hollow shaft of the first planet carrier 205. A protrusion is formed on the right side and contacts the second planet carrier 304, thereby axially limiting the second sun gear 303. The second planet gear 301 extends a cylindrical shaft to both sides and extends into the radial outer circular holes of the second planet carrier 304 and the second planet carrier cover 306 and can rotate freely. The second planet carrier 304 and the second planet carrier cover 306 are fixedly connected by the second planet carrier fastening screws 308. The second planet carrier 304 extends to the right to form a stepped solid shaft, and is supported on the right side housing 113 of the transmission through the No. 5 bearing 305, and the right side housing 113 of the transmission limits the No. 5 bearing in the axial direction; the second planet carrier cover 306 is supported on the hollow shaft of the first planet carrier 205 through the No. 4 bearing 302, and the No. 4 bearing 302 is axially limited by the shaft shoulder of the hollow shaft of the first planet carrier 205; the second inner gear ring 307 extends to the right to form a hollow shaft, and the solid shaft of the second planet carrier 304 passes through the hollow shaft of the second inner gear ring 307 from left to right without contact;

[0080] In this embodiment, as a preference, the planetary gear characteristic parameter of the second planetary gear train 300 is greater than 1.

[0081] The No. 1 electromagnetic brake 400 is located on the right side of the second planetary gear train 300, and includes a No. 1 excitation coil 401, a No. 1 magnetic yoke 402, a No. 1 electromagnetic brake housing 403, a No. 1 spring 404 evenly distributed along the circumferential direction, a friction disc 405, a No. 6 bearing 406, a friction lining 407, a round nut 408, a No. 1 electromagnetic brake screw 409 evenly distributed along the circumferential direction, and a No. 1 bushing 410 matched with the No. 1 electromagnetic brake screw 409;

[0082] Among them, the No. 1 electromagnetic brake housing 403 supports the hollow shaft of the second inner gear ring 307 through the No. 6 bearing 406, and the washer 309 is located between the second inner gear ring 307 and the No. 1 electromagnetic brake housing 403 to limit the axial position of the second inner gear ring 307; a group of No. 1 excitation coils 401 are wound in the annular groove of the No. 1 electromagnetic brake housing 403, and an air gap is left between the No. 1 excitation coil 401 and the No. 1 magnetic yoke 402. The radial The inner side is provided with blind holes evenly distributed along the circumferential direction, and the No. 1 spring 404 is arranged in the blind hole, and one end of the No. 1 spring 404 is embedded in the bottom of the blind hole, and the other end is bonded and fixed to the end face of the No. 1 yoke 402, and the annular groove of the No. 1 electromagnetic brake housing 403 and the opening direction of the blind hole are both to the right; the No. 1 bushing 410 passes through the No. 1 yoke 402 and is embedded in the No. 1 electromagnetic brake housing 403, and the No. 1 electromagnetic brake screw 409 passes through the No. 1 bushing 410 and The No. 1 electromagnetic brake housing 403 is screwed into the transmission annular housing 112, so that the No. 1 yoke 402, the No. 1 electromagnetic brake housing 403 and the transmission annular housing 112 are fixedly connected. The No. 1 yoke 402 can move axially along the No. 1 bushing 410. The No. 1 bushing 410 can prevent the No. 1 electromagnetic brake screw 409 from being worn during the axial movement of the No. 1 yoke 402, and can also ensure the minimum air gap between the No. 1 excitation coil 401 and the No. 1 yoke 402; the friction disc 405 extends to the left to form a hollow shaft, and is splined with the hollow shaft of the second inner gear ring 307, and the No. 6 bearing 406 is axially limited at the same time. The left and right sides of the friction disc 405 are inlaid with friction linings 407; the round nut 408 is threadedly connected to the right end of the hollow shaft of the second inner gear ring 307 to axially limit the friction disc 405, so that the friction disc 405 and the second inner gear ring 307 are fixedly connected as one.

[0083] The No. 2 electromagnetic brake 500 is located on the right side of the No. 1 electromagnetic brake 400, and includes a No. 2 excitation coil 501, a No. 2 magnetic yoke 502, a No. 2 spring 503 evenly distributed along the circumferential direction, a No. 2 electromagnetic brake housing 504, a No. 2 bushing 505 evenly distributed along the circumferential direction, and a No. 2 electromagnetic brake screw 506 matched with the No. 2 bushing 505;

[0084] Among them, the friction disk 405 is located between the No. 1 yoke 402 and the No. 2 yoke 502, and the No. 1 electromagnetic brake 400 and the No. 2 electromagnetic brake 500 share the friction disk 405; the No. 2 electromagnetic brake housing 504 is splined with the solid shaft of the second planetary carrier 304, and the No. 2 electromagnetic brake housing 504 is axially limited by the No. 5 bearing 305, and a group of No. 2 excitation coils 501 are wound in the annular groove of the No. 2 electromagnetic brake housing 504, and an air gap is left between the No. 2 excitation coils 501 and the No. 2 yoke 502, and blind holes uniformly distributed in the circumferential direction are opened on the radial inner side of the annular groove, and the No. 2 spring 503 is arranged in the blind hole, and one end of the No. 2 spring 503 is embedded in the bottom of the blind hole, and the other end is connected to the No. 2 yoke. The end face of 502 is bonded and fixed, and the opening directions of the annular groove and the blind hole of the No. 2 electromagnetic brake housing 504 are both to the left; the No. 2 bushing 505 passes through the No. 2 yoke 502 and is embedded in the No. 2 electromagnetic brake housing 504, and the No. 2 electromagnetic brake screw 506 passes through the No. 2 bushing 505 and is screwed into the No. 2 electromagnetic brake housing 504, thereby fixing the No. 2 yoke 502 and the No. 2 electromagnetic brake housing 504. The No. 2 yoke 502 can move axially along the No. 2 bushing 505. The No. 2 bushing 505 can prevent the No. 2 electromagnetic brake screw 506 from being worn during the axial movement of the No. 2 yoke 502, and at the same time, it can also ensure the minimum air gap between the No. 2 excitation coil 501 and the No. 2 yoke 502.

[0085] The right end of the solid shaft of the second planetary carrier 304 is processed with an external spline and is connected to the inner hole spline of the wheel hub 605; the hollow shaft of the wheel hub 605 extends into the center hole of the rim 602, and the rim bolt 603 and the rim nut 604 fix the wheel hub 605, the brake disc 607 and the rim 602, and the rim 602 is fixed to the tire 601; the right end of the solid shaft of the second planetary carrier 304 is processed with a threaded hole, the shaft end bolt 606 is screwed into the threaded hole, and the left end face of the shaft end bolt 606 contacts the right end face of the wheel hub 605, thereby axially fixing the wheel hub 605.

[0086] During the assembly process of the present invention, the inner rotor hub motor 100, the transmission annular housing 112, the transmission right housing 113, the screws 114, the first planetary gear train 200, the second planetary gear train 300, the No. 1 electromagnetic brake 400 and the No. 2 electromagnetic brake 500 are used as a power assembly, which is fixedly connected to the steering knuckle 110 and the brake caliper 608 by fastening screws 111, and is fixedly connected to the rim 602 and the hub 605 through the solid shaft of the second planetary carrier 304 extending from the right end.

[0087] like Figure 2 As shown, the main connection relationship of the highly integrated inner rotor hub motor two-speed transmission system is shown; the highly integrated inner rotor hub motor two-speed transmission system provided by the present invention has four working modes: forward first gear state; forward second gear state; reverse gear state; parking brake state;

[0088] The working principles of the four modes are explained below: In terms of the speed relationship, the rotation direction of the wheels when the electric vehicle is moving forward is set to the positive direction, and the rotation direction of the wheels when the electric vehicle is moving backward is set to the negative direction;

[0089] 1. Forward first gear state: When the electric vehicle is in the forward first gear state, the No. 1 excitation coil 401 is de-energized and the No. 2 excitation coil 501 is energized; at this time, the No. 2 excitation coil 501 attracts the No. 2 yoke 502 to move axially along the No. 2 bushing 505, eliminating the clamping force between the No. 2 yoke 502 and the friction disk 405; the No. 1 yoke 402 is pressed against the friction disk 405 under the action of the No. 1 spring 404, so that the No. 1 yoke 402 engages with the friction disk 405; the friction disk 405 is fixed, the second inner gear ring 307 is fixed, the inner rotor hub motor 100 outputs positive torque, the motor shaft 107 and the inner rotor 108 rotate forward synchronously, and assuming that the speed of the motor shaft 107 at this time is n, then the speed of the first sun gear 204 is n, because the first inner gear ring 208 is fixed, so its speed is 0, then according to the speed formula of the single-row single-stage planetary gear system, the speed of the first planet carrier 205 can be obtained as (k1 is the characteristic parameter of the planetary gear train 200, and k1>1), then the speed of the second sun gear 303 is Because the second inner gear ring 307 is fixed, its speed is 0. According to the speed formula of a single-row single-stage planetary gear train, the speed of the second planet carrier 304 is: (k2 is the characteristic parameter of the planetary gear of the second planetary gear train 300, and k2>1), the rotation speeds of the hub 605, the rim 602 and the tire 601 are all

[0090] Therefore, if Figure 3 As shown, when the electric vehicle is in the first forward gear state, the power is transmitted to the tire 601 via the motor shaft 107, the first sun gear 204, the first planetary gear 201, the first planetary carrier 205, the second sun gear 303, the second planetary gear 301, the second planetary carrier 304, the hub 605, the rim bolt 603, and the rim 602 in sequence, thereby driving the electric vehicle forward; at this time, the first gear transmission ratio of the highly integrated inner rotor hub motor two-speed transmission system is (k1+1)(k2+1).

[0091] 2. Forward second gear state: When the electric vehicle switches from the forward first gear state to the forward second gear state, the No. 1 excitation coil 401 is energized, and the No. 2 excitation coil 501 is de-energized; at this time, the No. 1 excitation coil 401 attracts the No. 1 magnetic yoke 402 to move axially along the No. 1 bushing 410, eliminating the clamping force between the No. 1 magnetic yoke 402 and the friction disk 405; the No. 2 magnetic yoke 502 is pressed toward the friction disk 405 under the action of the No. 2 spring 503, so that the No. 2 magnetic yoke 502 is engaged with the friction disk 405 ; The friction disc 405 is fixedly connected to the No. 2 electromagnetic brake housing 504, and the second inner gear ring 307 is fixedly connected to the second planet carrier 304; the inner rotor hub motor 100 outputs positive torque, the motor shaft 107 and the inner rotor 108 rotate forward synchronously, and assuming that the speed of the motor shaft 107 at this time is n, then the speed of the first sun gear 204 is n, because the first inner gear ring 208 is fixed, so its speed is 0, then according to the single-row single-stage planetary gear train speed formula, the speed of the first planet carrier 205 can be obtained as Then the speed of the second sun gear 303 is Because the second inner gear ring 307 is fixedly connected to the second planet carrier 304, the rotation speeds of the two are the same. According to the rotation speed formula of a single-row single-stage planetary gear train, the rotation speeds of the second inner gear ring 307 and the second planet carrier 304 are the same as the rotation speed of the second sun gear 303, which are both Then the rotation speeds of the hub 605, rim 602 and tire 601 are all

[0092] Therefore, if Figure 4 As shown, when the electric vehicle is in the second forward gear state, the power is transmitted to the tire 601 in sequence through the motor shaft 107, the first sun gear 204, the first planetary gear 201, the first planetary carrier 205, the second sun gear 303, the second planetary gear 301, the second inner ring gear 307 and the second planetary carrier 304, the hub 605, the rim bolt 603, and the rim 602, thereby driving the electric vehicle forward; at this time, the second gear transmission ratio of the highly integrated inner rotor hub motor two-speed transmission system is (k1+1).

[0093] 3. Reverse gear state: When the electric vehicle is in the reverse gear state, it is only necessary to make the inner rotor hub motor 100 output negative torque and the motor shaft 107 reverse. The remaining working principles are exactly the same as those of the forward first gear state and the forward second gear state, and will not be repeated here.

[0094] 4. Parking brake state: When the electric vehicle stops driving and performs parking brake, both the No. 1 excitation coil 401 and the No. 2 excitation coil 501 are powered off; at this time, the No. 1 yoke 402 is pressed toward the friction disk 405 by the action of the No. 1 spring 404, so that the No. 1 yoke 402 engages with the friction disk 405; the friction disk 405 is fixed, and the second inner gear ring 307 is fixed; the No. 2 yoke 502 is also pressed toward the friction disk 405 by the action of the No. 2 spring 503, so that the No. 2 yoke 502 engages with the friction disk 405, so the No. 2 yoke 502 is also fixed, thereby preventing the No. 2 electromagnetic brake housing 504 from rotating, and further preventing the second planetary carrier 304 from rotating, thereby preventing the wheel hub 605, the rim 602 and the tire 601 from rotating.

[0095] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. Highly integrated inner rotor hub motor two-speed transmission system, characterized by: include: Hub motor housing; A motor shaft, which is rotatably supported at the center of both sides of the wheel hub motor housing, and the output end of the motor shaft extends out of the wheel hub motor housing; A first sun gear, which is fixedly connected to the output end of the motor shaft; A plurality of first planetary gears meshingly matched with the first sun gear; A first inner gear ring, which meshes and matches with the first planetary gear, and the first inner gear ring is fixedly connected to the hub motor housing; A first planet carrier, which is provided with a stepped hollow shaft and is rotatably supported on the motor shaft; A first planet carrier cover, which is rotatably supported on the motor shaft, and the first planet carrier cover is fixedly connected to the first planet carrier; a second sun gear, which is fixedly connected to the first planet carrier; A plurality of second planetary gears meshingly matched with the second sun gear; A second inner gear ring meshing with the second planetary gear; Second planet carrier; a second planet carrier cover rotatably supported on the first planet carrier, and the second planet carrier cover is fixedly connected to the second planet carrier; A first electromagnetic brake; A second electromagnetic brake; The first electromagnetic brake comprises: A first electromagnetic brake housing, wherein the second inner gear ring is rotatably supported on the first electromagnetic brake housing, and a first annular groove is circumferentially arranged on the first electromagnetic brake housing, and first blind holes are uniformly distributed along the circumferential direction on the radial inner side of the first annular groove; A first excitation coil, which is arranged in the first annular groove; A first magnetic yoke, which is provided with a gap between itself and the first excitation coil; a first spring, which is arranged in the first blind hole, with one end thereof being arranged to abut against the bottom of the first blind hole, and the other end thereof being fixedly connected to the first magnetic yoke; The second electromagnetic brake comprises: A second electromagnetic brake housing is fixedly connected to the second planet carrier, and a second annular groove is circumferentially arranged on the second electromagnetic brake housing, and second blind holes are evenly distributed along the circumferential direction on the radial inner side of the second annular groove; a second excitation coil, which is disposed in the second annular groove; a second magnetic yoke, which is provided with a gap between itself and the second excitation coil; a second spring, which is arranged in the second blind hole, and has one end thereof in conflict with the bottom of the second blind hole, and the other end thereof fixedly connected to the second magnetic yoke; The first electromagnetic brake and the second electromagnetic brake share the same friction disc and other components, so as to reduce the number of parts and improve the integration; The friction disk has a gap between the first magnetic yoke and the second magnetic yoke, and the friction disk is fixedly connected to the second inner gear ring and axially limited; The first excitation coil and the second excitation coil are selectively energized and deenergized, so that the friction disk is selectively pressed against the first magnetic yoke or the second magnetic yoke under the action of the first spring and the second spring, so as to fix the second inner gear ring or fix the second inner gear ring and the second planet carrier; The highly integrated inner rotor hub motor two-speed transmission system is further characterized in that: the hub motor housing includes a first housing and a second housing, and the second housing is provided with a concave cavity, and the first sun gear, the first planetary gear, the first inner gear ring and the first planet carrier cover are arranged in the concave cavity; The highly integrated inner rotor hub motor two-speed transmission system is also characterized in that it has four working modes: forward first gear state; forward second gear state; reverse gear state; parking brake state; Among them, when the first excitation coil is de-energized and the second excitation coil is energized, the highly integrated inner rotor hub motor two-speed transmission system operates in the forward first gear state; when the first excitation coil is energized and the second excitation coil is de-energized, the highly integrated inner rotor hub motor two-speed transmission system operates in the forward second gear state; when both the first excitation coil and the second excitation coil are de-energized, the two electromagnetic brakes are locked under the action of the first spring and the second spring, and at this time the highly integrated inner rotor hub motor two-speed transmission system operates in the parking brake state; when the motor shaft is reversed, and the power-on and power-off conditions of the first excitation coil and the second excitation coil are the same as the forward first gear state and the forward second gear state, the highly integrated inner rotor hub motor two-speed transmission system operates in the reverse gear state.

2. The highly integrated inner rotor hub motor two-speed transmission system according to claim 1, characterized in that: Also includes: A transmission housing, the transmission housing includes a first transmission housing and a second transmission housing, the first transmission housing is fixedly connected to the second transmission housing, and the first transmission housing is fixedly connected to the hub motor housing and the first electromagnetic brake housing, and the second planetary carrier is rotatably supported on the second transmission housing.

3. The highly integrated inner rotor hub motor two-speed transmission system as claimed in claim 2, characterized in that: Also includes: a wheel hub, which is fixedly connected to the second planet carrier; A brake disc fixedly connected to the wheel hub; A rim, which is fixedly connected to the wheel hub; A tire is fixedly connected to the rim.

4. The highly integrated inner rotor hub motor two-speed transmission system as claimed in claim 3, characterized in that: Also includes: a first bushing passing through the first yoke and embedded in the first electromagnetic brake housing; A second bushing passes through the second yoke and is embedded in the second electromagnetic brake housing.

5. The highly integrated inner rotor hub motor two-speed transmission system as claimed in claim 4, characterized in that: Also includes: A plurality of friction linings are symmetrically inlaid on both sides of the friction disk.

6. The highly integrated inner rotor hub motor two-speed transmission system according to any one of claims 2 to 5, characterized in that: The hub motor housing also includes: A stator housing, which is fixedly installed between the end faces of the first housing and the second housing; A winding fixed on the stator housing; An inner rotor, which is fixedly mounted on the motor shaft; A permanent magnet is fixed on the inner rotor.

7. The highly integrated inner rotor hub motor two-speed transmission system as claimed in claim 6, characterized in that: The first planet carrier axially limits the first sun gear through a protrusion formed on the end surface of the first sun gear; The second planet carrier axially limits the second sun gear through a protrusion formed on the end surface of the second sun gear; The first electromagnetic brake housing axially limits the second inner gear ring through a washer.

8. The highly integrated inner rotor hub motor two-speed transmission system as claimed in claim 7, characterized in that: Also includes: A steering knuckle, which is fixedly connected to the wheel hub motor housing, and the steering knuckle is fixedly connected to the vehicle body through a suspension; A brake caliper is fixedly connected to the steering knuckle.

9. The highly integrated inner rotor hub motor two-speed transmission system as claimed in claim 8, characterized in that: The first planetary gear has cylindrical shafts on both sides; The first planet carrier and the first planet carrier cover have radially outer circular holes; Wherein, the cylindrical shaft of the first planetary wheel and the first planet carrier are matched and installed with the radial outer circular hole of the first planet carrier cover; The second planetary gear has cylindrical shafts on both sides; The second planet carrier and the second planet carrier cover have radially outer circular holes; The cylindrical shaft of the second planetary gear and the second planet carrier are matched and installed with the radially outer circular hole of the second planet carrier cover.

10. An electric vehicle, characterized in that: Use the highly integrated inner rotor hub motor two-speed transmission system as described in claims 1-9.

Images