CN108128142B - A wheel hub rim structure, electronic round and vehicle for electronic round - Google Patents

Abstract

The invention provides a hub and rim structure for an electric wheel, the electric wheel and a vehicle, wherein the electric wheel comprises a hub motor, a planetary reducer, a hub assembly and a rim; the wheel hub and wheel rim structure is characterized in that two groups of alternate bolts are uniformly distributed on the circumference of a wheel rim flange and are respectively used for connecting a wheel rim of an electric wheel and connecting the wheel rim of the electric wheel, a planet carrier of a planetary reducer and a wheel hub, so that the reliable transmission of the power of a motor of the electric wheel, the mechanical braking force and the load of the wheel rim and the integrated installation of the large-transformation-ratio planetary reducer, the wheel hub and the wheel rim are realized. Compact structure, easy maintenance is fit for adopting electric wheel driven heavy vehicle to use.

Description

A wheel hub rim structure, electronic round and vehicle for electronic round

Technical Field

The invention belongs to the technical field of electric drive of electric automobiles, and particularly relates to a hub and rim structure of an electric wheel integrated with a hub motor and a vehicle with the hub and rim structure.

Background

The electric wheel technology is also called as the in-wheel motor technology, the motor is also called as a hub motor, and the motor has the greatest characteristic that a power device, a transmission device and a braking device are integrated into a hub, so that the mechanical part of the electric vehicle is greatly simplified, and compared with other driving forms, the electric wheel technology has the advantages of short transmission chain, high transmission efficiency, flexible arrangement and the like. The obvious advantages of electric vehicles employing electric wheel technology in terms of overall vehicle layout, dynamic performance and control have led to widespread academic and industrial concerns.

Aiming at electric automobiles, particularly large tonnage, the vehicle bearing and power requirements and the axial and radial space of a hub are strictly limited, the torque capacity of an outer rotor hub motor is limited, the unsprung mass is increased due to large weight, and the high-speed running performance of the vehicle is influenced. Patent CN103328247A proposes an in-wheel motor driving device, but the speed reducing mechanism used is not clear and the device is relatively large in axial size and volume. In order to realize a speed reducer with a large speed ratio, the prior art generally adopts a multi-stage planetary speed reduction technical scheme, the speed reducer occupies a large axial size, a hub brake is difficult to arrange, and the brake is arranged at the end of a motor shaft, so that the service life of the brake is reduced due to the requirement of high rotating speed.

In order to overcome the defects of the prior art and the scheme, an integrated inner rotor hub motor electric wheel scheme with high integration level, good dynamic characteristic and high reliability is provided.

However, currently, the rim is usually mounted by a set of bolts, and the mounting flange surface of the rim is far away from the central surface. The existing hub rim structure has the following problems:

1, only adopt a set of bolt, cause the rim connecting force not enough, or make the bolt figure increase for strengthening the connecting force, be inconvenient for the dismouting.

2. The stress point of the rim is far away from the supporting point, the stress arm is long, and the stress condition is severe.

3. The condition of connecting a hub and a speed reducer flange is not fully considered, and the installation is inconvenient.

Disclosure of Invention

In order to overcome the defects of the prior art and the prior art, the invention provides a hub and rim connecting structure for an electric wheel. In the scheme, a group of wheel rim bolts are adopted to connect and complete the positioning and fastening of the inner and outer wheel rims in a non-bearing state, so that a complete wheel rim is formed, and reliable fastening is realized; and a group of wheel hub bolt connections are uniformly distributed at the opposite positions on the same circumference of the wheel rim bolt connection, so that the reliable transmission of the motor power, the mechanical braking force and the ground load of the planetary reducer during the running of the vehicle is realized, and the bolt fastening force of the inner wheel rim and the outer wheel rim is doubled compared with the bolt fastening force of the non-bearing state. When the tire is replaced, the inner rim and the outer rim can be integrally detached only by removing the hub bolts; when the vehicle runs, the two bolts jointly act on the inner rim and the outer rim, so that the reliability of the force transmission structure and the maintenance convenience of the rim are guaranteed.

The scheme of the invention is as follows:

a hub-rim structure for an electric wheel, the electric wheel comprising a hub motor, a planetary reducer, a hub assembly and a rim; the input of the planetary reducer is a sun gear, and the output of the planetary reducer is a planet carrier; the hub assembly includes a hub; the rim comprises an inner rim and an outer rim; the inner rim is provided with a flange-shaped inner rim mounting flange facing the center of the wheel; the outer rim is provided with a flange-shaped outer rim mounting flange facing the center of the wheel; the inner side of the inner rim mounting flange is sequentially provided with a connecting end surface of a planet carrier mounting flange and a hub; two groups of rim bolts and hub bolts which are arranged alternately are uniformly distributed on the same circumference of the inner rim mounting flange and the outer rim mounting flange; wherein the rim is bolted with the inner rim and the outer rim; the hub is connected with the inner rim and the outer rim through bolts, and the planet carrier mounting flange is connected with the connecting end surfaces of the hub.

Preferably, rim bolt mounting flares are arranged on the inner rim mounting flange and the outer rim mounting flange, rim bolt arrangement flares are arranged on the connecting end surfaces of the planet carrier mounting flange and the hub, rim bolts are mounted at the rim bolt mounting flares, and bolt heads of the rim bolts or fastening nuts of the rim bolts are accommodated in a space formed by the rim bolt arrangement flares.

Preferably, two sets of rim bolt mounting flares and hub bolt mounting holes which are arranged at intervals are uniformly distributed on the circumference of the inner rim mounting flange and the outer rim mounting flange, wherein the circumference of the inner rim mounting flange and the circumference of the outer rim mounting flange have the same size as the circumference.

Preferably, the connecting end face of the planet carrier mounting flange and the wheel hub is provided with wheel hub bolt countersunk holes and wheel rim bolt arrangement flaring holes which are uniformly distributed on the circumference with the same size as the circumference, and the wheel hub bolt countersunk holes and the wheel rim bolt arrangement flaring holes are arranged at intervals.

Preferably, the hub bolts pass through the hub bolt mounting holes and the hub bolt counter bores.

Preferably, the planetary reduction gear is located outside the hub assembly.

Preferably, the rim bolts are tightened from outside the outer rim.

And tire inflation door mounting holes are also formed in the wheel hub bolt and the wheel rim bolt distribution circle.

The invention also relates to an electric wheel comprising the structure.

The invention also relates to a vehicle comprising the structure.

Drawings

FIG. 1 is a schematic view of an electric wheel according to the present invention

FIG. 2 is an exploded view of an electric wheel according to the present invention

FIG. 3 is a schematic view of the assembly of the electric wheel of the present invention

FIG. 4 is an assembled sectional view of the electric wheel of the present invention

FIG. 5 is an assembled sectional view of the electric wheel of the present invention

FIG. 6 is an assembly view of the integrated knuckle end cap of the present invention

FIG. 7 is a finite element stress and strain diagram of an integrated knuckle end cap in accordance with the present invention

FIG. 8 is a schematic diagram of the transmission path of each force of the electric wheel according to the present invention

Wherein 8(a) the transmission route of the driving force or the electric braking force of the hub motor; 8(b) a hub brake power transmission path; 8(c) transmission route of bearing force of electric wheel or acting force of ground on wheel rim

FIG. 9 is a cross-sectional view of the structure of the hub and rim of the present invention

FIG. 10 is an exploded view of the hub and rim structure of the present invention

FIG. 11 is a schematic view of the hub structure of the present invention

In the figure:

1-rim, 101-outer rim, 102-inner rim, 103-rim bolt mounting flaring, 104-hub bolt mounting opening, 105-tire valve core position hole,

2-planetary reducer, 3-hub, 4-hub brake, 41-brake disk,

5-motor shaft body end cover flange, 51-motor shaft body end cover connecting bolt,

6-hub motor, 61-hub motor shell, 62-junction box, 63-wheel brake,

7-knuckle end cap, 71-upper knuckle, 72-lower knuckle, 8-suspension swing arm,

9-hub bearing, 10-hub motor rotor shaft,

21-sun gear, 22-planet carrier, 23-gear ring, 12-gear ring fixing frame,

13-inner cylinder, 14-outer cylinder, 15-steering arm.

Detailed Description

In the present invention, the inner and outer directions refer to the side closer to the center of the vehicle as the inner side and the side farther from the center of the vehicle as the outer side in the wheel axis direction, regardless of whether the electric wheels are on the left side or the right side of the vehicle as a whole.

The electric wheel of the present invention can be applied to various vehicles of an electric drive type, in a case where auxiliary power is given by electric power, such as four-wheel vehicles of a fuel cell vehicle or an electric vehicle. The method is particularly suitable for electric vehicles with large torque and heavy load. The present invention is not limited to two-wheeled vehicles, golf carts or three-or four-wheeled vehicles for the elderly or disabled, medium and heavy duty commercial vehicles in construction sites or transportation industries, tracked vehicles, and the like.

The electric wheel solution shown in fig. 1-5 consists of a hub motor 6, a planetary reducer 2, a hub assembly and a rim 1.

A vehicle tire is mounted on the rim 1.

The planetary reducer 2 is positioned outside the hub assembly; the outer side of the hub motor 6 is connected with the hub assembly through a motor shaft body end cover flange 5; the inner side of the hub motor 6 is connected with a steering knuckle end cover 7; the knuckle end cap 7 is connected to a suspension swing arm 8 of the vehicle suspension.

The planetary reducer 2 comprises a sun gear 21, a planet carrier 22, a gear ring 23 and a gear ring fixing frame 12, wherein the input of the planetary reducer 2 is the sun gear 21, and the output of the planetary reducer is the planet carrier 22; the planetary reducer 2 is connected between the motor rotor shaft 10 and the rim 1; the planetary reducer 2 adopts one-stage high-transformation-ratio speed reduction to realize torque and rotating speed matching between a high-speed motor and the low-speed rim 1, the sun wheel 21 is connected with the rotor shaft 10 of the hub motor, and the planet carrier 22 is fixedly connected with the rim 1 through bolts. The outer end of the gear ring fixing frame 12 is fixedly connected with the gear ring 23, the inner end of the gear ring fixing frame 12 is fixed with the inner cylindrical part 13, the inner cylindrical part 13 is fixedly connected with the motor shaft body end cover flange 5, and the gear ring 23 is fixed on the motor shaft body end cover flange 5 through the gear ring fixing frame 12, so that the gear ring is fixedly connected with the motor shell 61 relatively, and the axial and circumferential positioning of the gear ring 23 is realized. The gear of the ring gear 23 consists of a first gear which meshes with the planet gears and a second gear which meshes with the outer end of the ring gear fixed frame. The sun gear 21, the planet gear and the gear ring 23 in the planetary reducer 2 adopt helical gears, and the planet gear realizes automatic axial positioning and is in an axial floating state through gear meshing with the gear ring 23 and the sun gear so as to ensure good meshing state and bearing capacity of the reduction planetary reducer.

The electromagnetic torque of the hub motor 6 is reduced and increased through the planetary reducer 2, and then the power is transmitted to the rim 1, so that the wheel is driven or electrically braked. When in driving, the power transmission direction is the input of the sun gear 21, and the output of the planet carrier 22; the power transmission direction during electric braking is input to the carrier 22 and output from the sun gear 21.

The motor rotor shaft 10 is an output shaft of a hub motor, and the motor rotor shaft 10 is connected with a sun gear 21 of the planetary speed reducer 2 through a half shaft; the half shaft is respectively connected with an internal spline hole gear of the sun gear and the motor rotor shaft 10 through splines at two end parts.

The hub 3 is fixedly connected with the planet carrier 22 and the rim 1 of the planetary reducer 2.

More preferably, the electric wheel further comprises a hub brake 4, wherein the hub brake 4 is positioned in a space enclosed by the motor shaft body end cover flange 5, the hub 3 and the rim 1. The shell of the hub brake 4 is connected to the end cover flange of the hub motor shaft body, and the brake disc 41 of the hub brake 4 is fixedly connected with the hub 3. The hub brake is a high-torque low-rotation-speed brake, preferably a pneumatic full-disc brake, and the connection mode of fixedly connecting a brake disc 41 of the brake to the hub 3 is preferably a cylindrical pin on which the brake disc 41 can axially move.

Preferably, the hub 3 is fixedly connected with the planet carrier 22, the rim 1 and the brake disc 41 of the hub brake 4, and the hub 3 is preferably connected with the planet carrier 22, the rim 1 and the hub brake 4 at the same position through the same connecting piece.

The hub brake 4 consists of a brake shell, a brake disc 41, a friction plate and a brake pair action mechanism; the brake shell is fixedly connected with an end cover flange 5 of the motor shaft body through a group of bolts, is a fixed part and does not rotate; the brake disc 41 is connected with the hub 3 through a cylindrical pin or a spline and is a rotating piece; the friction plate is supported in the brake shell through a spline or a slide rail; when high-pressure hydraulic oil or gas flows through the oil cavity or the gas chamber, the high-pressure hydraulic oil or gas acts on the piston to generate axial thrust, so that the friction plate is pressed against the brake disc 41 to generate friction torque to prevent the hub 3 from rotating, and the braking function of the rim 1 is completed.

The hub assembly is connected between the rim 1 and the motor shaft end cap flange 5 and comprises a hub 3, an inner cylindrical portion 13, an outer cylindrical portion 14 and a hub bearing 9. The inner cylindrical part 13 is fixedly connected with the motor shaft body end cover flange 5, and the inner cylindrical part 13 and the motor shaft body end cover flange 5 can be split parts or can be integrally formed parts.

The transmission half shaft is positioned in the inner cylindrical part 13, and the sun gear is connected with a motor rotor shaft through the transmission half shaft positioned in the inner cylindrical part 13; the inner cylindrical portion 13 is located inside the outer cylindrical portion 14; the outer cylindrical portion 14 and the hub 3 are fixedly connected, and the outer cylindrical portion 14 and the hub 3 may be separate members or may be integrally molded members. The outer cylindrical part 14 is rotatably connected with the inner cylindrical part 13, a hub bearing 9 is arranged between the inner cylindrical part 13 and the outer cylindrical part 14, the hub bearing 9 adopts two conical roller bearings which are horizontally arranged, the central line of the rim 1 falls between the two conical roller bearings, and other bearings can be selected for other application requirements. The inner cylindrical portion 13 also supports the ring gear holder 12 of the planetary reduction gear 2.

The hub assembly is connected with the hub motor shell 61 through the motor shaft body end cover flange 5.

The hub motor 6 of the scheme is positioned in a space formed by surrounding a steering knuckle end cover 7, a motor shaft end cover flange 5 and a hub motor shell 61. The hub motor 6 is an inner rotor high-speed motor, based on the electromagnetism principle, when a designed current passes through a motor stator winding, the motor rotor and the stator generate an expected electromagnetic torque through the electromagnetic action, the motor rotor is driven to rotate, and the hub motor rotor shaft is driven to rotate to output power. The hub motor 6 comprises a motor stator, a motor rotor, a hub motor shell 61/a motor water jacket, a hub motor rotor shaft 10, a motor shaft body end cover flange 5 and a motor steering knuckle end cover 7, and electromagnetic torque generated by the hub motor 6 rotor is transmitted to a sun gear 21 of the planetary reducer 2 through the hub motor rotor shaft 10; the motor shaft body end cover flange 5 is supported on the hub 3 by two hub bearings 9, an inner cylindrical portion 13 and an outer cylindrical portion 14 which are opposed to each other, and supports a ring gear fixing frame 12 of the planetary gear 2 by the inner cylindrical portion 13. The motor housing 61 is located between the motor shaft end cover flange 5 and the motor knuckle end cover 7, the motor shaft end cover flange 5 and the motor knuckle end cover 7 are respectively and fixedly connected with the hub motor housing 61, the motor housing 61 integrates a motor cooling water path, and the motor housing is also called a motor water jacket in this case.

The motor knuckle end cap 7 is connected with the vehicle suspension, and as shown in fig. 6, the motor knuckle end cap, the upper knuckle, the lower knuckle and the wheel knuckle mounting interface are integrally integrated. The upper steering knuckle and the lower steering knuckle are distributed on the edge of the end cover of the motor, wherein the upper swing arm and the lower swing arm of the suspension are connected with the upper steering knuckle and the lower steering knuckle, so that the connection between the motor and the swing arm of the suspension is realized, the pin hole center lines of the upper steering knuckle and the lower steering knuckle are on the same straight line, the steering knuckle can rotate around the straight line, and the straight line and the vertical direction of the electric wheel keep a certain inclination angle. The upper steering knuckle is connected with the upper swing arm of the suspension through a ball pin; the lower steering knuckle is connected with the lower swing arm and the steering arm of the suspension through ball pins.

The motor junction box 62 is arranged on the end face of the motor knuckle end cover 7, and meanwhile, in order to reduce the axial length of the motor and the space limitation of the motor shaft side, the outgoing line of the motor end junction box 62 is outgoing from the end of the electric wheel along the axial direction of the motor, and specifically, the outgoing line is outgoing from the end of the motor knuckle end cover 7 along the axial direction of the motor.

For the situation that the braking force is insufficient and a plurality of brakes need to be installed, wheel-side brake 63 installation interfaces are reserved. Because the end center position of the in-wheel motor 6 is connected with the wheel-side brake 63, the junction box 62 is arranged at the radial outer side of the wheel-side brake 63 and close to the edge of the motor steering knuckle end cover 7.

The load of the ground acting on the rim 1 of the electric wheel is transferred to a motor end cover by a hub motor shell 61 or a motor water jacket, and then transferred to a corresponding suspension swing arm by an upper steering knuckle and a lower steering knuckle at the edge of the motor end cover, as shown in fig. 7, the thickness of the edge of the motor end cover in the circumferential direction is thicker than that of the middle part, the thickness of the upper steering knuckle and the lower steering knuckle is gradually thinner along the axial direction of the motor, and the material thickness of the transition part of the lower steering knuckle and the motor end cover is thicker than that of the transition part of the upper steering knuckle and the motor end cover because the lower steering knuckle bears more load than that of the upper steering knuckle and the; the upper surface of the upper steering knuckle pin hole is connected with an upper swing arm ball pin of the suspension, the upper surface of the lower steering knuckle pin hole is connected with a lower swing arm ball pin of the suspension, the lower surface of the lower steering knuckle pin hole is connected with the steering arm, the upper swing arm ball pin and the lower swing arm ball pin of the suspension can rotate and jump up and down in the upper steering knuckle and the lower steering knuckle along the horizontal direction, and the shape of the motor end cover is determined by combining the steering of the vehicle wheels and the jumping range of the.

Through the force transmission mode, the invention realizes reasonable transmission of motor power, hub brake power, steering power, whole vehicle vertical load and acting force of ground on the wheel rim when the vehicle drives, brakes and steers.

The structural strength and rigidity of each stressed part of the motor steering end cover are verified by adopting a finite element analysis means in combination with the running condition of a vehicle, as shown in FIG. 7; the analysis method is characterized in that the upper and lower steering knuckles are fixed, 2 worst working conditions are selected, namely vehicle ground impact load, 3 times of static load and 0.65g of lateral maximum acceleration when the vehicle turns, the lateral maximum acceleration acts on the motor steering knuckle end cover 7 through the hub motor shell/motor water jacket, the stress and the strain distribution are reasonable as can be seen from the stress and the strain diagram of the motor steering knuckle end cover 7, and the device structurally meets the bearing requirement.

The planet carrier 22, the gear ring fixing frame 12, the inner cylindrical part 13, the motor shaft body end cover flange 5, the motor shell 61, the motor steering knuckle end cover 7 and the suspension swing arm 8 are fixedly connected, and the planet carrier 22, the gear ring fixing frame 12, the inner cylindrical part, the motor shaft body end cover flange 5, the motor shell 61 and the motor steering knuckle end cover 7 cannot rotate along the wheel shaft due to connection with the suspension swing arm 8.

When the vehicle is driven, the whole vehicle charges a stator winding of the hub motor 6 according to a selected whole vehicle control strategy, generates electromagnetic torque with a rotor, transmits power to the planetary reducer 2 and the sun gear 21 through the rotor shaft 10 of the hub motor, and transmits the power to the hub 3 and the rim 1 through the planet carrier 22 after the speed reduction and torque increase of the planetary reducer 2 so as to drive the wheel.

The driving force transmission path of the hub motor comprises the following steps:

referring to fig. 8(a), the driving force acting on the wheel rim 1 is generated by the in-wheel motor 6, the power output by the motor rotor shaft 10 is connected to the sun gear 21 of the planetary reducer 2 through a half shaft, and is transmitted to the wheel rim 1 by the planet carrier 22 through speed reduction and torque increase of the planetary reducer 2 and finally acts on the wheel, so that the in-wheel motor drives the wheel to rotate.

Secondly, the braking force transmission path is as follows:

for an electric vehicle, the braking force acting on the wheel rim 1 is provided by the hub brake 4 and the hub motor 6 together, wherein the hub brake 4 generates mechanical braking force and the hub motor 6 generates electric braking force. The braking force of the rim 1 is mainly provided by the electric braking force when the electrically driven vehicle runs at a high speed, the electric braking force and the mechanical braking force are provided together when the vehicle runs at a low speed, the mechanical braking force and the electric braking force are reasonably and efficiently distributed by controlling the intervention time and the intervention strength of the hub brake 4 and the hub motor 6, and the electric energy generated by the electric braking is recovered to the maximum extent on the premise of ensuring the safety of the vehicle braking.

When the vehicle is braked, according to a selected whole vehicle control strategy, when the running speed of the vehicle is higher than a certain vehicle speed and the action of a brake pedal meets a certain condition, firstly, a hub motor 6 generates electric brake torque, the electric brake torque is transmitted to a hub 3 through a half shaft, a sun gear 21 and a gear ring of a planetary reducer 2, and finally, the electric brake torque acts on a rim to play a role in braking the rim 1; when the running speed of the vehicle is lower than a certain vehicle speed and the action of a brake pedal meets a certain condition, the hub brake 4 and the hub motor 6 are both put into operation, the mechanical braking force of the hub 3 and the motor electric braking force transmitted from the hub 3 act on the rim 1 together through the hub 3, and the electromechanical combined braking of the rim 1 is completed; when the vehicle speed is lower than a certain vehicle speed or the brake pedal action meets a certain condition, the electric braking force is cancelled, and the hub brake 4 only generates the braking force action to act on the rim 1, so that the braking of the vehicle is completed;

mechanical braking force transmission path see 8 (b): the brake disc 41 of the hub brake 4 is fixedly connected with the hub 3, and the shell of the hub brake 4 is connected with the end cover flange 5 of the motor shaft body, so that the mechanical braking force generated by the hub brake 4 is directly acted on the hub 3 and is transmitted to a wheel;

electric braking force transmission path see fig. 8 (a): the same as the driving force transmission path, the hub motor 6 generates electric braking force, which is transmitted to the rim 1 through the motor rotor shaft 10, the half shaft, the sun gear 21 and the planet carrier 22 in sequence, and finally acts on the wheel.

Thirdly, the transmission path of the vertical load of the whole vehicle and the bearing capacity of the electric wheel is shown in fig. 8(c), and the transmission path is as follows:

the force applied to the suspension by the whole vehicle sequentially passes through the suspension swing arm, the motor steering knuckle end cover 7, the hub motor shell 61, the motor shaft end cover flange 5, the inner cylindrical part 13 and the outer cylindrical part 14 to be distributed, then is converged to the hub 3, and finally is transmitted to the rim 1, so that the bearing capacity transmission of the electric wheel is realized.

The bearing capacity is divided by the inner cylindrical part 13 and the outer cylindrical part 14 near the axle, so that the bearing load of the inner cylindrical part 13 and the outer cylindrical part 14 is reduced, the reliability of a transmission part is improved, and the inner cylindrical part 13 and the outer cylindrical part 14 jointly bear the vertical load of the whole vehicle, so that the scheme is suitable for heavy electric vehicles.

Referring to fig. 8(c), the force transmission path of the ground surface acting on the rim 1 is as follows:

the force of the ground acting on the rim 1 is transmitted to the inner cylindrical part 13 and the outer cylindrical part 14 through the hub 3 to be split, then is converged to the motor shaft end cover flange 5, and is transmitted to the suspension through the hub motor shell 61, the motor steering knuckle end cover 7 and the suspension swing arm in sequence.

Because the force of the ground acting on the rim 1 is dispersed by the inner cylindrical part 13 and the outer cylindrical part 14, the bearing load of the inner cylindrical part 13 and the outer cylindrical part 14 is reduced, the reliability of the transmission part is improved, and because the inner cylindrical part 13 and the outer cylindrical part 14 bear the force of the ground acting on the rim 1 together, the scheme is suitable for heavy electric vehicles.

The invention realizes reasonable transmission of motor power, hub brake power, steering power, whole vehicle vertical load and acting force of ground on the wheel rim when the vehicle drives, brakes and steers; on the basis of reasonable transmission of the force of the electric wheels, a one-stage large-transformation-ratio planetary speed reduction technology and a full-disc type wheel hub braking technology are adopted, the axial size of components is greatly reduced, the reliability of transmission components is improved, the weight of the electric wheels is reduced, the transmission efficiency is improved, and the electric wheel hub transmission device is particularly suitable for heavy electric vehicles.

In another embodiment of the present invention, a rim connecting structure of the present invention is as follows:

as shown in fig. 9-11, the rim includes an outer rim 101 and an inner rim 102. The inner rim has a flange-like inner rim mounting flange toward the wheel center and the outer rim has a flange-like outer rim mounting flange toward the wheel center.

Two groups of bolt holes which are arranged alternately are uniformly distributed on the same circumference of the outer rim 101 and the inner rim 102, and are respectively a rim bolt mounting flared opening 103 and a hub bolt mounting hole 104.

The inner side of the inner rim mounting flange is sequentially provided with a connecting end surface of a planet carrier mounting flange and a hub; two groups of rim bolt arrangement flaring holes and hub bolt countersunk holes which are arranged alternately are uniformly distributed on the circumference with the same radius of the connecting end surfaces of the planet carrier mounting flange and the hub.

Wherein the rim is connected with the inner rim and the outer rim through bolts; the hub is connected with the inner rim, the outer rim, the planet carrier mounting flange and the connecting end surface of the hub through bolts. Specifically, the center of the rim bolt mounting flare 103 and the center of the rim bolt arrangement flare are located at the same axial and radial positions; the rim bolts are installed at the rim bolt installation flaring positions, the bolt heads of the rim bolts or the fastening nuts of the rim bolts are accommodated in the space formed by the rim bolt arrangement flaring, and the fastening connection of the outer rim 101 and the inner rim 102 is realized. The hub bolts penetrate through the hub bolt mounting holes 104 and the hub bolt countersunk holes, so that the fastening connection of the connection end surfaces of the outer rim 101, the inner rim 102, the planet carrier mounting flange and the hub is realized, and further the rim, the planet carrier of the planetary speed reducer and the hub are fastened.

The power of the hub motor is transmitted to the hub bolt connection part by the planet carrier 22 and then transmitted to the hub 3 through the hub motor rotor shaft 10 and the half shaft after the speed reduction and torque increase of the planetary reducer 2; the mechanical braking force is transmitted to the hub bolt connection through the hub 3 and transmitted to the hub 3, and the load of the ground on the rim acts on the hub 3 through the hub bolt and is supported on the motor shaft body end flange 5 through the inner cylindrical part 13, the outer cylindrical part 14 and the hub bearing 9.

To facilitate tire inflation, tire valve core mounting holes 105 are also provided on the hub and rim bolt distribution circles through which the tire valve cores are mounted.

The beneficial effects of the embodiment are as follows: through the design of two groups of bolts, the fastening of the inner rim and the outer rim is finished, and the planet carrier flange and the wheel hub can also be fixedly connected; when the tire is replaced, the rim can be detached only by removing the hub bolts, so that the maintenance convenience of the rim is realized; when the vehicle runs, the two bolts jointly act on the inner rim and the outer rim, and the reliability of the force transmission structure is guaranteed.

The rim connection scheme solves the problems that the connecting force of the rim, the hub and the planet carrier is insufficient or the rim is not convenient to disassemble and assemble, has a compact structure and convenient maintenance, and is suitable for being applied to heavy vehicles driven by electric wheels.

Claims (9)

1. A hub and rim structure for an electric wheel,

the electric wheel comprises a hub motor, a planetary reducer, a hub assembly and a rim;

the input of the planetary reducer is a sun gear, and the output of the planetary reducer is a planet carrier;

the hub assembly includes a hub;

the rim comprises an inner rim and an outer rim; the inner rim is provided with a flange-shaped inner rim mounting flange facing the center of the wheel; the outer rim is provided with a flange-shaped outer rim mounting flange facing the center of the wheel;

the method is characterized in that:

the inner side of the inner rim mounting flange is sequentially provided with a connecting end surface of a planet carrier mounting flange and a hub;

two groups of rim bolts and hub bolts which are arranged alternately are uniformly distributed on the same circumference of the inner rim mounting flange and the outer rim mounting flange;

wherein the rim is bolted with the inner rim and the outer rim;

the hub is connected with the inner rim and the outer rim through bolts, and the planet carrier mounting flange is connected with the connecting end surfaces of the hub;

the rim bolt mounting flaring is arranged on the inner rim mounting flange and the outer rim mounting flange, the rim bolt arrangement flaring is arranged on the connecting end surface of the planet carrier mounting flange and the hub, the rim bolt is arranged at the rim bolt mounting flaring position, and the bolt head of the rim bolt or the fastening nut thereof is accommodated in the space formed by the rim bolt arrangement flaring.

2. The structure of claim 1, wherein: two groups of rim bolt mounting flaring holes and hub bolt mounting holes which are arranged alternately are evenly distributed on the circumference of the inner rim mounting flange and the outer rim mounting flange, which has the same size with the circumference.

3. The structure of claim 2, wherein the connecting end face of the planet carrier mounting flange and the wheel hub is provided with hub bolt countersunk holes and rim bolt arrangement flaring holes which are uniformly distributed on the circumference with the same size as the circumference, and the hub bolt countersunk holes and the bolt arrangement flaring holes are arranged at intervals.

4. The structure of claim 3, a hub bolt passing through the hub bolt mounting hole and the hub bolt counterbore.

5. The structure of any one of claims 1 to 4, wherein: the planetary reducer is located outside the hub assembly.

6. The structure of any one of claims 1 to 4, wherein: and fastening a rim bolt from the outer side of the outer rim.

7. The structure of any one of claims 1 to 4, wherein: and tire inflation door mounting holes are also formed in the wheel hub bolt and the wheel rim bolt distribution circle.

8. An electric wheel, characterized in that: comprising a structure according to any one of claims 1 to 7.

9. A vehicle, characterized in that: comprising a structure according to any one of claims 1 to 7.

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