CN210554158U

CN210554158U - Electric wheel adopting wet brake

Info

Publication number: CN210554158U
Application number: CN201921091688.3U
Authority: CN
Inventors: 李建秋; 李景康; 胡家毅; 李航; 蔡炳坤; 宋金鹏; 徐梁飞; 欧阳明高
Original assignee: Tsinghua University
Current assignee: Nanjing Qingyan Yiwei New Energy Power Co ltd
Priority date: 2019-07-12
Filing date: 2019-07-12
Publication date: 2020-05-19
Anticipated expiration: 2029-07-12

Abstract

The utility model discloses an electric wheel adopting a wet brake, which belongs to the field of general vehicles; the tire is arranged outside the rim, a wheel disc is arranged at one axial end of the rim, and the hub is connected with the outer side of the wheel disc of the rim; the wheel disc of the hollow disc-shaped structure is fixedly connected to the radial inner side of the wheel rim and is positioned at the axial outer end of the wheel rim; the inner rotor hub motor and the wet brake are both arranged in the motor shell, the inner rotor hub motor is positioned on the axial inner side of the planetary gear reducer, and the wet brake is positioned on the radial inner side of the inner rotor hub motor; the mechanical braking moment that the stopper provided can be used for to the rim after enlargiing via planetary gear reducer, and required stopper braking force reduces to some extent, does benefit to the lightweight of stopper, and wet brake is enveloped in electric motor rotor, rotor inner wall appearance rule, and axial dimension is convenient for control, the utility model provides a wet brake actuating mechanism simple structure occupies that electronic round inner space is few.

Description

Electric wheel adopting wet brake

Technical Field

The utility model belongs to the technical field of general vehicle, specifically be an adopt wet brake's electronic round.

Background

The distributed driving technology has the advantages of short transmission chain, high transmission efficiency, high integration level, contribution to the general arrangement of vehicles, independent control and measurement of the torque of each wheel motor, convenience for realizing various complete vehicle dynamics control and the like, so that an electric wheel system driven by the wheel hub motor becomes a research and development hotspot of various research and development institutions and companies.

In the electric wheel system, the brake system has important significance, although a general hub motor can provide sufficient braking force for the electric wheel system, the mechanical brake function is still very important in the occasions of emergency braking, low speed and the like, and the high-reliability mechanical brake system is an important component of the electric wheel system. The compact arrangement of the electric wheel system also puts higher requirements on the reliability and compactness of the brake system compared with the conventional vehicle, and the influence of the temperature rise of the mechanical brake system on the components such as the motor, the seal and the like of the electric wheel is reduced as much as possible through reasonable structural arrangement and design. In the existing electric wheel technology, there are the following mechanical brake system schemes: disc brakes, drum brakes, wet brakes, and the like.

Among the problems of disc brakes are: the disc brake is used for the electric wheel, and the disc brake is specially manufactured for the electric wheel, so the development cost is high; secondly, the caliper of the disc brake occupies a large circumferential dimension, which is difficult to arrange in a compact space of the electric wheel. Problems with drum brakes are: arranging the drum brake inside the rotor of the in-wheel motor may result in deteriorated heat dissipation conditions of the drum brake; furthermore, the actuating mechanism and the return mechanism of the conventional drum brake are also difficult to arrange in a compact space of the electric wheel.

The wet brake has the following advantages in comparison: the wet brake, the hub motor and the speed reducer can be subjected to integrated oil cooling, so that the problem that the heat dissipation condition of the brake is deteriorated is solved; the multi-disc wet brake has uniform size in the circumferential direction, and can save space.

However, the technology of using wet brakes in electric wheels is still not mature, and there is a large development space.

In the conventional wet brake technology, a wet multi-disc brake is often adopted.

Schaeffler uses a multi-disc wet brake as a reducer for the hub motor, with the brake being disposed behind the reducer.

Since the brake is arranged at a low speed stage, the brake needs to provide a large braking force, and in order to provide a large braking force, a large axial force is required inside the brake, which may adversely affect the strength of the electric wheel structure.

In the schaeffler hybrid module, a lever mechanism is used to create the required pressing force of the clutch. The arrangement mode can counteract the influence of axial force on the system structure, but the lever mechanism arrangement in the scheme wastes a large space and is not suitable for an electric wheel system with high space requirement.

An electric wheel assembly adopting a drum brake is disclosed in an electric wheel assembly adopting the drum brake, which is disclosed in Chinese patent No. ZL2019101670982, although each shell does not bear corresponding load, the weight reduction of a corresponding structure is facilitated, and the influence of the wheel load on the performance of a motor is reduced; however, since the number of parts such as a knuckle bushing is large, the axial dimension is large and greatly exceeds the thickness of the tire because the number of parts is large on the inner side (the side close to the brake) of the electric wheel.

In order to solve the problems and defects in the prior art, the electric wheel which does not adopt a scheme of a multi-piece wet brake is provided, and the problem that the axial size and the structural strength of the electric wheel are difficult to guarantee simultaneously when the required braking force is increased is solved.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the background art, the utility model provides an adopt wet brake's electronic round, a serial communication port, include: the brake comprises a tire, a rim, a hub, a wet brake, an inner rotor hub motor, a planetary gear reducer and a motor shell, wherein the tire is arranged outside the rim, a wheel disc is arranged at one axial end of the rim, and the hub is connected with the outer side of the wheel disc of the rim; the wheel disc of the hollow disc-shaped structure is fixedly connected to the radial inner side of the wheel rim and is positioned at the axial outer end of the wheel rim; the inner rotor hub motor and the wet brake are both arranged in the motor shell, the inner rotor hub motor is positioned on the axial inner side of the planetary gear reducer, and the wet brake is positioned on the radial inner side of the inner rotor hub motor;

the motor shell consists of a stator shell, an inner end cover and an outer end cover; the stator shell is of a cylindrical structure without an end face, a disc-shaped inner end cover is arranged on the inner side in the axial direction of the stator shell, and the outer end cover and the speed reducer shell of the planetary gear speed reducer are sequentially connected to the outer side in the axial direction of the stator shell; the hub passes through the centers of the inner rotor hub motor and the wet brake.

The inner rotor hub motor comprises a stator, a winding, a rotor and a rotor sleeve, wherein the stator is arranged in a stator shell, the winding is wound on the stator, the rotor is fixedly connected to the middle of the circumferential outer side of the rotor sleeve, the rotor sleeve is of a sleeve-shaped structure, and the outer end of the rotor sleeve is fixedly connected with a sun gear of the planetary gear reducer; the radial inner side and the radial outer side of the rotor sleeve are connected with the hub and the motor shell through the hub bearing and the rotor bearing respectively.

And a three-phase line outlet and a signal line outlet are formed in the inner end cover, a winding of the inner rotor hub motor extends out of the three-phase line outlet, and a low-voltage signal line extends out of the signal line outlet.

The wet brake includes: the brake shoe, the brake ejector rod, the brake shoe mounting pin, the C-shaped spring, the roller and the ribbed plate; the two brake shoe mounting pins are fixedly connected to the outer side of the inner end cover, the brake shoes are consistent with the brake shoes of a standard drum brake in structural form, the axial thickness of the brake shoes can be adjusted according to actual application occasions, and the brake friction plates are mounted on the peripheral surfaces of the brake shoes; each brake shoe is provided with two layers of ribbed plates, and a pin is arranged between the two layers of ribbed plates; the C-shaped spring is additionally arranged between the two layers of ribbed plates of the brake shoe and clamped outside the pin in the middle of the two layers of ribbed plates.

The brake shoe installation pin and the roller are respectively installed at two ends of the brake shoe, the axis of the brake shoe installation pin is perpendicular to the radial surface of the brake shoe, the axis of the roller is parallel to the radial surface of the brake shoe, the brake ejector rod is located between the two rollers, and two side faces of the brake ejector rod are respectively in contact connection with the two rollers.

The two lateral surfaces of the brake ejector rod are symmetrical.

The brake ejector rod is formed by sequentially and integrally fixedly connecting a head rectangular part, a middle trapezoidal part and a tail rod piece which are collinear by symmetrical lines; the brake ejector rod is contacted with the roller wheel from the joint of the head rectangle and the middle trapezoid or contacted with the roller wheel from the head rectangle.

The tail rod piece penetrates through the opening of the inner end cover, an installation opening is formed in the outer side near the opening of the inner end cover to install a brake chamber support, the connecting part of the brake chamber support and the inner end cover is of a cylindrical structure, the end part of the connecting part is provided with a flange surface, and the brake chamber support is sleeved outside the tail rod piece of the brake ejector rod; the brake air chamber is arranged on the brake air chamber bracket.

Two inclined edges of the middle trapezoid are straight lines or arc lines.

The planetary gear reducer is arranged between the spoke plate and the motor shell and is installed on the stator shell together with the outer end cover of the motor shell.

The planetary gear reducer includes: the planetary gear reducer has the advantages that the input end is the sun gear, the output end is the planet carrier, and the planet carrier is integrated on the hub and is a part of the hub; the planet wheel is installed on the planet carrier through the planet wheel round pin, and the outer end of planet wheel round pin passes the mounting hole of planet carrier and the opening of radials, and its outside one end sets up the screw thread in order to be in the same place planet carrier and radials fixed, fixes the outside one end of planet wheel round pin on the planet carrier simultaneously, and the other end of planet wheel round pin passes through circlip and fixes on the planet carrier dish.

The beneficial effects of the utility model reside in that:

1. the inner rotor hub motor and the wet brake are of hollow cylindrical structures, the hub can penetrate through the middle of the inner rotor hub motor and the wet brake, the radial space inside the rim is reasonably utilized, the arrangement center position and the span of the hub bearing are reasonable, and the bearing of the whole electric wheel is facilitated.

2. The acting force applied to the rim is transmitted to a suspension system through a wheel hub, a wheel hub bearing, a rotor sleeve, a rotor bearing and a motor shell which are integrated with a planet carrier of the planetary gear reducer, and the force bearing path is reasonable and the structural strength is high; parts such as the shell of the speed reducer do not bear corresponding loads, but only mainly transmit torque, and the light weight of a corresponding structure is facilitated.

3. Arrange the high-speed end at electronic round with the stopper and adopt wet brake, because the stopper is arranged at high-speed end, the mechanical braking moment that the stopper provided can be used for to the rim after enlargiing via planetary gear reducer, required stopper braking force reduces to some extent, do benefit to the lightweight of stopper, and wet brake is enveloped in electric motor rotor, rotor inner wall appearance rule, axial dimension is convenient for control, suitably lay in high-speed end and wheel inboardly, and compare in the required design change of traditional drum brake and compare in traditional disc brake still less than electronic round disc brake, do benefit to with electronic round of whole integration, in addition, disc brake scheme relatively, the utility model provides a wet brake has cost advantage. Compare traditional multi-disc wet brake, the utility model provides a wet brake actuating mechanism simple structure occupies electronic round of inner space few.

4. The integrated cooling of the planetary gear reducer, the inner rotor hub motor and the wet brake can be realized, under the integrated cooling and lubricating scheme, the peak value of the inner rotor hub motor and the output torque and the output power under the continuous condition can be greatly improved, and the cooling and lubricating state of the planetary gear reducer and the integration level of the whole electric wheel assembly can also be improved.

5. The wet brake is mainly used for emergency braking, low speed, full power of a battery system and the like, the service life and the brake strength are reduced, and the requirement for brake heat dissipation is reduced.

6. Planetary gear of planetary gear reducer adopts hierarchical tower gear, the drive ratio of single-stage planetary gear reducer has been improved on the one hand, the output torque of electronic wheel assembly has been guaranteed, on the other hand is guaranteeing that the speed reduction ratio reaches under the circumstances of requirement, the axial length of planetary gear reducer has effectively been reduced to this kind of mode of arranging, make inner rotor wheel hub motor and planetary gear reducer's axial length sum unlikely to overlength, can arrange in the space that radials and inboard rim were injectd, also make the overall position of wheel hub bearing unlikely to be too close to the tire outside, it is hollow disc structure to add the radials again, make wheel hub and wheel back shaft etc. can pass wherein, the central point that two wheel hub bearings arranged puts and the span can be more reasonable, do benefit to the bearing of electronic wheel.

Drawings

Fig. 1 is a schematic view of an embodiment of an electric wheel using a wet brake according to the present invention;

fig. 2 is a partial cross-sectional view of a wet brake and motor housing according to an embodiment of the present invention;

fig. 3 is a three-dimensional schematic view of a wet brake according to an embodiment of the present invention;

fig. 4 is a schematic view of the planetary gear reducer according to the embodiment of the present invention.

In the figure:

2-wet brake, 3-inner rotor hub motor, 4-planetary gear reducer, 5-motor housing, 6-brake chamber holder, 7-brake chamber, 11-tire, 12-rim, 13-hub, 14-web, 21-brake shoe, 22-brake ejector pin, 23-brake shoe mounting pin, 24-pin, 25-C spring, 26-roller, 27-rib, 31-stator, 32-rotor sleeve, 33-rotor, 41-sun gear, 42-planet gear, 43-ring gear, 44-reducer housing, 45-planet carrier, 46-planet carrier disk, 47-planet wheel pin, 51-stator housing, 52-inner end cap, 53-outer end cap, 221-head rectangle, 222-middle trapezoid, 223-tail rod, 131-hub bearing, 331-rotor bearing.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The embodiment of the present invention shown in fig. 1 to 4 includes: the brake comprises a tire 11, a rim 12, a hub 13, a wet brake 2, an inner rotor hub motor 3, a planetary gear reducer 4 and a motor housing 5, wherein the tire 11 is installed outside the rim 12, a wheel disc 14 is installed at one axial end of the rim 12, and the hub 13 is connected with the outer side of the wheel disc 14 of the rim 12; the wheel disc 14 of the hollow disc-shaped structure is fixedly connected to the radial inner side of the rim 12 and is located at the axial outer end of the rim 12 (the side far away from the wheel disc 14 is the axial inner side of the electric wheel, and the side close to the wheel disc 14 is the axial outer side);

the motor housing 5 is composed of a stator housing 51, an inner end cap 52 and an outer end cap 53; the stator housing 51 is a cylindrical structure without an end face, a disc-shaped inner end cover 52 is mounted on the inner side of the stator housing 51 in the axial direction, and an outer end cover 53 and the reducer housing 44 of the planetary gear reducer 4 are sequentially connected to the outer side of the stator housing 51 in the axial direction; the wet brake 2 is positioned on the inner side of the inner rotor hub motor 3; the hub 13 passes through the center of the inner rotor hub motor 3 and the wet brake 2.

The inner rotor hub motor 3 shown in fig. 1 and 2 is a permanent magnet synchronous motor, and includes a stator 31, a winding, a rotor 33 and a rotor sleeve 32, wherein the stator 31 is installed in a stator housing 51, the winding (three-phase line) is wound on the stator 31, the rotor 33 is fixedly connected to the middle of the circumferential outer side of the rotor sleeve 32, the rotor sleeve 32 is a power output end of the inner rotor hub motor 3, the rotor sleeve 32 is a sleeve-shaped structure, the outer end of the rotor sleeve is fixedly connected to a sun gear 41 of a planetary gear reducer 4, and the axis of the rotor sleeve 32 is collinear with the axis of the sun gear 41; the inner end cover 52 is provided with a three-phase line outlet and a signal line outlet, the winding of the inner rotor hub motor extends out from the three-phase line outlet, and the low-voltage signal line extends out from the signal line outlet; the radial inner side and the radial outer side of the rotor sleeve 32 are connected with the hub 13 and the motor housing 5 through a hub bearing 131 and a rotor bearing 331 respectively; specifically, the axial outside and the axial inside of the radial outside of the rotor sleeve 3 are respectively connected with the outer end cap 53 and the inner end cap 52 through the rotor bearing 331;

in the present embodiment, the low voltage signal line includes, but is not limited to, a low voltage signal line of a sensor such as a resolver, a motor temperature sensor, or the like.

The wet brake 2 shown in fig. 1 to 3 includes: a brake shoe 21, a brake carrier 22, a brake shoe mounting pin 23, a pin 24, a C-shaped spring 25, a roller 26 and a rib 27; two of the brake shoe mounting pins 23 are fixedly connected to the inner end cover 52; the axial thickness of the brake shoe can be adjusted according to the actual application occasion, and the brake friction plate is arranged on the peripheral surface of the brake shoe 21; each brake shoe 21 has two layers of ribbed plates 27, and a pin 24 is arranged between the two layers of ribbed plates 27; the C-shaped spring 25 is arranged in the brake shoes 21 and is circumferentially positioned between the two brake shoes 21, and the C-shaped spring 25 is additionally arranged between the two layers of ribbed plates of the brake shoes and clamped outside the pin 24 between the two layers of ribbed plates.

The brake shoe mounting pin 23 and the roller 26 are respectively mounted at two ends of the brake shoe 21, the axis of the brake shoe mounting pin 23 is vertical to the radial surface of the brake shoe 21, the axis of the roller 26 is parallel to the radial surface of the brake shoe 21, the brake ejector rod 22 is positioned between the two rollers 26, and two side surfaces of the brake ejector rod 22 are respectively in contact connection with the two rollers 26 under the action of the C-shaped spring 25; and two side surfaces of the brake mandril 22 are symmetrical;

the brake ejector rod 22 is formed by sequentially and integrally fixedly connecting a head rectangle 221, a middle trapezoid 222 and a tail rod piece 223 with collinear symmetry lines; wherein the head rectangle 221 and the middle trapezoid 222 are block structures with side faces, and the tail rod 223 is a rectangular block or a cylinder; in a natural state, the brake push rod 22 is contacted with the roller 26 from the connection part of the head rectangle 221 and the middle trapezoid 222 or contacted with the roller from the head rectangle 221.

An opening is formed in an inner end cover 52 of the motor shell 5, a tail rod 223 of the brake ejector rod 22 penetrates through the opening, an installation opening is formed in the outer side near the opening of the inner end cover 52 to install a brake chamber support 6, the connection part of the brake chamber support 6 and the inner end cover 52 is of a cylindrical structure, the end part of the cylindrical structure is provided with a flange surface, and the brake chamber support 6 is sleeved outside the tail rod 223 of the brake ejector rod 22; a brake chamber 7 is mounted on the brake chamber bracket 6.

In this embodiment, the brake shoe 21 conforms to a standard drum brake shoe configuration, but the axis of the roller 26 is orthogonal to the axis of the drum inside the rotor 33;

in this embodiment, the shape of the outer shaft end of the brake carrier rod 22 is a symmetrical arrow shape, but both sides of the arrow shape of the outer shaft end of the brake carrier rod (i.e. both inclined sides of the middle trapezoid 222) may be straight lines or arc lines, and may be specifically and optimally designed according to the expanding process of the wet brake.

When the mechanical braking process starts (during braking), the brake air chamber 7 pushes the brake ejector rod 22 to move, the trapezoid 222 in the middle of the brake ejector rod 22 pushes the rollers 26 on the two sides, so that the distance between the two rollers 26 is increased, the two brake shoes 21 are pushed to gradually expand, and friction braking force is generated between a friction plate (friction material) on each brake shoe 21 and a brake drum on the inner wall of the rotor 33 of the inner rotor hub motor 3; after the mechanical braking process is finished, the brake ejector rod 22 retracts to the original position, and the pretightening force of the C-shaped spring 25 acts on the pin 24 to drive the brake shoe 21 to retract to the original position.

The planetary gear reducer 4 shown in fig. 1 and 4 is disposed between the web 14 and the motor housing 5, mounted on the stator housing 51 together with the outer end cover 53 of the motor housing 5; the planetary gear reducer 4 includes: the sun gear 41, the planet gear 42, the gear ring 43, the reducer housing 44 and the planet carrier 45, wherein the input of the planet gear reducer is the sun gear 41, the output of the planet carrier 45 is the planet carrier 45, and the planet carrier 45 is integrally integrated on the hub 13 and is a part of the hub 13; the inner rotor hub motor 3 is arranged in the motor shell 5 and is positioned on the axial inner side of the planetary gear reducer 4, and the wet brake 2 is also arranged in the motor shell 5; and is located radially inside the inner rotor hub motor 3.

The planetary gear 42 of the planetary gear reducer meshes with the sun gear 41 and also meshes with the ring gear 43.

In the present embodiment, there are a plurality of planet wheels 42, the planet wheels 42 are supported on the planet carrier 45 through planet wheel pins 47, and planet wheel bearings are arranged between the planet wheels 42 and the planet wheel pins 47; the outer end of the planet pin 47 passes through the mounting hole of the planet carrier 45 and the opening of the web 14, and the outer end is provided with a thread to fix the planet carrier 45 and the web 14 together, while the outer end of the planet pin 47 is fixed on the planet carrier 45, and the other end of the planet pin 47 is fixed on the planet carrier disk 46 through an elastic retainer ring. Due to the arrangement of the planet carrier disk 46, the planet wheel pin 47 is prevented from being in a cantilever structure, the supporting rigidity of the planet wheel pin 47 is improved, and the improvement of the transmission precision of the planetary gear reducer and the reduction of noise vibration are facilitated.

In the present embodiment, the carrier disk 46 is made in one piece with the carrier 45, all integral to the hub, but may also be made separately.

Each planet wheel 42 may be of stepped, tower-type gear structure, and each planet wheel comprises a primary gear engaged with the sun wheel 41, a secondary gear coaxially arranged with the primary gear and engaged with the ring gear 43, and the number of teeth of the secondary gear is smaller than that of the primary gear. By adopting the graded tower type planetary gear with the variable structure, the transmission ratio from the sun gear 41 to the planet carrier 45 can be effectively improved, and the specific calculation formula is as follows:

as shown in fig. 4, the number of teeth of the sun gear 41 is z1, the number of teeth of the primary gear of the planetary gear 42 is z2, the number of teeth of the secondary gear of the planetary gear 42 is z3, and the number of teeth of the ring gear 43 is z 4.

The planet wheel 42 in the form of the stepped tower gear is adopted, on one hand, the transmission ratio of the single-stage planetary gear reducer can be improved, the output torque of the electric wheel assembly is ensured, or a hub motor with smaller peak torque can be selected under the same target peak output torque of the electric wheel, the design requirement on the motor is lower, and the light weight of the motor is facilitated; on the other hand, compared with the multi-stage transmission scheme, the axial size of the planetary gear reducer can be effectively reduced under the condition that the transmission ratio is ensured to be sufficiently large, so that the sum of the axial lengths of the inner rotor hub motor and the planetary gear reducer is not too long and is completely arranged in the space between the radial plate 14 and the inner end cover 52.

The reducer case 44 is installed radially outside the ring gear 43, and has a stepped sleeve structure with reinforcing ribs arranged on the outer peripheral surface thereof; the larger diameter end of the reducer housing 44 is connected to the inner rotor hub motor.

Oil spray cooling is adopted for the inner rotor hub motor 3, and oil spray cooling for the inner rotor hub motor 3 is realized through a cooling liquid inlet and a cooling liquid outlet which are arranged on the stator shell 51.

Alternatively, the inner rotor hub motor 3, the planetary gear reducer 4, the wet brake 2, and the hub bearing 131 are cooled and lubricated integrally. The integrated cooling and lubricating is that an opening is arranged on an outer end cover 53 of the inner rotor hub motor 3, so that cooling oil entering the inner rotor hub motor 3 and the wet brake 2 from a cooling liquid inlet enters the planetary gear reducer 4, enters the inner space of the hub 13 from the space between the planetary gear 42 and the hub bearing 131, then flows back to the bottoms of the planetary gear reducer 4 and the inner rotor hub motor 3, and flows out through a cooling liquid outlet at the bottom of the inner rotor hub motor 3.

A filter screen and an adsorption permanent magnet are arranged on the opening of the outer end cover 53 to filter and adsorb metal abrasive dust.

Since the motor rotor is connected to the rotor sleeve 32, and the other end of the rotor sleeve 32 is simultaneously connected to the input end of the planetary gear reducer 4, the friction torque of the mechanical brake is transmitted to the rim 12 after being increased by the planetary gear reducer 4, so that the friction torque of the mechanical brake to be provided by the wet brake 2 under the same condition can be smaller, that is, the radius of the brake shoe 21 is smaller, and thus is allowed to be arranged on the radial inner side of the motor rotor 33. Moreover, the wet brake 2 is also advantageous in the dimension in the axial direction, except in the radial direction. Compared with a disc brake, the wet brake 2 has uniform axial thickness, so that the axial size is convenient to control, the disc brake usually has a brake caliper with a longer axial size, the disc brake is not beneficial to integration to an electric wheel, and even if the disc brake is an all-disc brake, the axial size of the disc brake does not have advantages compared with the wet brake 2.

Because the motor rotor is connected to the rotor sleeve, the mechanical braking force of the wet brake 2 can be amplified through the planetary gear reducer 4, and the required actuating force is smaller than the situation that the mechanical braking force is not amplified, so that the size of actuating mechanisms such as the brake air chamber 7 and the like can be reduced, the actuating mechanisms are arranged in the motor shell 5 of the electric wheel assembly and integrated with the motor shell 5, the integration level of the system is improved, and more space is saved for the middle part of a vehicle body.

Under the structure, the acting force applied to the wheel rim 12 is transmitted to a suspension system through the wheel web 14, the wheel hub 13 integrated with the planet carrier 45 of the planetary gear reducer 4, the wheel hub bearing 131, the rotor sleeve, the rotor bearing 331 and the motor shell 5, and the force bearing path is reasonable and the structural strength is high; the components such as the reducer housing 44 and the like do not bear corresponding loads, but only mainly transmit torque, and light weight of corresponding structures is facilitated.

When a vehicle is driven, according to a method for controlling the whole vehicle, a motor controller leads current to a winding of an inner rotor hub motor 3 through a three-phase line, the inner rotor hub motor 3 generates torque to drive a rotor sleeve to rotate, the rotor sleeve inputs power into a planetary gear reducer 4 through a sun gear 41 at the end part, the power is output through a planet carrier 45 after the speed reduction and torque increase of the planetary gear reducer 4, the planet carrier 45 is a hub 13 of an electric wheel assembly, and the power is transmitted to a radial plate 14 connected with the hub 13 through the hub 13, so that a rim 12 and a tire 11 are driven to rotate.

When the vehicle brakes, an electromechanical hybrid braking mode is adopted, and braking force acting on wheels is provided by the inner rotor hub motor 3 and the wet brake 2 together, wherein the inner rotor hub motor 3 generates electric braking force, and the wet brake 2 generates mechanical braking force. The braking force of the vehicle during high-speed running is mainly provided by the inner rotor hub motor 3, the braking force during low-speed running or under emergency braking is provided by the inner rotor hub motor 3 and the wet brake 2 together or only provided by the wet brake 2, and the coordination control between mechanical braking and electric braking can be realized through a certain control algorithm, so that the braking energy recovery is realized on the premise of ensuring the safety.

For example, according to a certain electromechanical hybrid brake control algorithm, when the vehicle running speed is higher than a certain vehicle speed and the action of a brake pedal input by a driver meets a certain condition, the inner rotor hub motor 3 generates an electric brake torque, the electric brake torque is output through the rotor sleeve and acts on the rim 12 through the planetary gear reducer 4 and the hub 13 to play a braking role. When the running speed of the vehicle is lower than a certain vehicle speed and the action of the brake pedal meets a certain condition, the wet brake 2 and the inner rotor hub motor 3 work, the brake air chamber 7 is controlled to push the brake ejector rod, the brake shoe 21 is pushed to be opened to generate friction braking force, the mechanical braking force acting on the motor rotor also acts on the rotor sleeve, and acts on the rim 12 through the speed reduction and torque increase of the planetary gear reducer 4 to play a role in braking. When the vehicle speed is lower than a certain vehicle speed, or the brake pedal action meets a certain condition, or the SOC of the power battery is higher than a certain limit value and approaches full power, the electric braking force is cancelled, and the vehicle is braked by only generating the braking force by the wet brake 2. When the brake pedal operation satisfies a predetermined condition for emergency braking, the wet brake 2 can be controlled to generate mechanical braking force in the same manner as in the case where the vehicle speed is high.

The utility model discloses an adopt wet brake 2's electronic round assembly provides power and torque density height, lightweight level height, each part bear reasonable in-wheel 13 motor reduction drive's electronic round configuration, compromise dynamic nature, efficiency, sealed and radiating under the condition, the gross mass has been reduced as far as possible.

Claims

1. An electric wheel using a wet brake, comprising: the brake device comprises a tire (11), a rim (12), a hub (13), a wet brake (2), an inner rotor hub motor (3), a planetary gear reducer (4) and a motor shell (5), wherein the tire (11) is installed outside the rim (12), a spoke plate (14) is installed at one axial end of the rim (12), and the hub (13) is connected with the outer side of the spoke plate (14) of the rim (12); a wheel disk (14) with a hollow disk-shaped structure is fixedly connected to the radial inner side of the rim (12) and is positioned at the axial outer end of the rim (12); the inner rotor hub motor (3) and the wet brake (2) are both arranged in the motor shell (5), the inner rotor hub motor (3) is positioned on the axial inner side of the planetary gear reducer (4), and the wet brake (2) is positioned on the radial inner side of the inner rotor hub motor (3);

the motor shell (5) consists of a stator shell (51), an inner end cover (52) and an outer end cover (53); the stator shell (51) is of a cylindrical structure without an end face, an inner end cover (52) is installed on the inner side in the axial direction of the stator shell (51), and the outer end cover (53) and a speed reducer shell (44) of the planetary gear speed reducer (4) are sequentially connected to the outer side in the axial direction of the stator shell (51); the hub (13) passes through the centers of the inner rotor hub motor (3) and the wet brake (2).

2. The electric wheel with the wet brake as claimed in claim 1, wherein the inner rotor hub motor (3) comprises a stator (31), a winding, a rotor (33) and a rotor sleeve (32), wherein the stator (31) is installed in a stator housing (51), the winding is wound on the stator (31), the rotor (33) is fixedly connected to the middle of the circumferential outer side of the rotor sleeve (32), the rotor sleeve (32) is of a sleeve-shaped structure, and the outer end of the rotor sleeve is fixedly connected with the sun wheel (41) of the planetary gear reducer (4); the radial inner side and the radial outer side of the rotor sleeve (32) are respectively connected with the hub (13) and the motor shell (5) through a hub bearing (131) and a rotor bearing (331).

3. An electric wheel using a wet brake according to claim 2, wherein the inner end cap (52) is provided with a three-phase wire outlet from which the winding of the inner rotor hub motor (3) is extended and a signal wire outlet from which a low-voltage signal wire is extended.

4. A powered wheel employing a wet brake, according to claim 1, characterized in that said wet brake (2) comprises: the brake shoe comprises a brake shoe (21), a brake ejector rod (22), a brake shoe mounting pin (23), a pin (24), a C-shaped spring (25), a roller (26) and a ribbed plate (27); two brake shoe mounting pins (23) are fixedly connected to the outer side of the inner end cover (52), the brake shoes (21) are consistent with the brake shoes of a standard drum brake in structural form, the axial thickness of the brake shoes can be adjusted according to actual application occasions, and brake friction plates are mounted on the peripheral surface of the brake shoes (21); each brake shoe (21) is provided with two layers of ribbed plates (27), and a pin (24) is arranged between the two layers of ribbed plates (27); the C-shaped spring (25) is additionally arranged between the two layers of ribbed plates of the brake shoe and clamped outside the pin (24) between the two layers of ribbed plates;

the brake shoe installation pin (23) and the roller (26) are respectively installed at two ends of the brake shoe (21), the axis of the brake shoe installation pin (23) is perpendicular to the radial surface of the brake shoe (21), the axis of the roller (26) is parallel to the radial surface of the brake shoe (21), the brake ejector rod (22) is located between the two rollers (26), and two side faces of the brake ejector rod (22) are respectively in contact connection with the two rollers (26).

5. An electric wheel using a wet brake according to claim 4, wherein both sides of the brake carrier rod (22) are symmetrical.

6. The electric wheel using the wet brake of claim 4, wherein the brake carrier rod (22) is composed of a head rectangle (221), a middle trapezoid (222) and a tail rod (223) which are symmetrical and collinear, and are sequentially and integrally fixedly connected; the brake mandril (22) is contacted with the roller (26) from the joint of the head rectangle (221) and the middle trapezoid (222) or the head rectangle (221) is contacted with the roller (26).

7. The electric wheel using the wet brake as claimed in any one of claims 4 to 6, wherein the brake carrier rod (22) passes through the opening of the inner end cap (52), and a mounting opening is provided on the outer side near the opening of the inner end cap (52) to mount the brake chamber bracket (6), the connection part of the brake chamber bracket (6) and the inner end cap (52) is a cylindrical structure with a flange surface at the end part, and the brake chamber bracket (6) is sleeved outside the brake carrier rod (22); and a brake air chamber (7) is arranged on the brake air chamber bracket (6).

8. The wet brake electric wheel as claimed in claim 6, wherein both inclined sides of the middle trapezoid (222) are straight lines or arc lines.

9. An electric wheel using a wet brake according to claim 1, characterized in that the planetary gear reducer (4) is disposed between the web (14) and the motor housing (5), and is mounted on the stator housing (51) together with an outer end cover (53) of the motor housing (5).

10. A wet brake electric wheel according to one of claims 1 or 9, wherein the planetary gear reducer (4) includes: the sun gear (41), the planet gear (42), the gear ring (43), the speed reducer shell (44) and the planet carrier (45), wherein the input of the planet gear speed reducer is the sun gear (41), the output of the planet carrier (45) is the planet carrier (45), and the planet carrier (45) is integrally integrated on the hub (13) and is a part of the hub (13); the planet wheel (42) is installed on the planet carrier (45) through a planet wheel pin (47), the outer end of the planet wheel pin (47) penetrates through an installation hole of the planet carrier (45) and an opening of the spoke plate (14), one end of the outer side of the planet wheel pin (47) is provided with threads to fix the planet carrier (45) and the spoke plate (14) together, one end of the outer side of the planet wheel pin (47) is fixed on the planet carrier (45), and the other end of the planet wheel pin (47) is fixed on a planet carrier disc (46) through an elastic retainer ring.