CN111284316A - A wheel hub drive and brake integrated device with dual motors - Google Patents

Abstract

The invention discloses a hub driving and braking integrated device with double motors, which comprises: a first motor having a power output shaft; the first planet row comprises a first sun gear, a first planet carrier and a first gear ring; the power output shaft is fixedly connected with the first sun gear, and the first planet carrier is fixedly connected with a rim; a first brake selectively engaged with or disengaged from the first ring gear; a second drive motor including a stator and a rotor; the second planet row comprises a second sun gear, a second planet carrier and a second gear ring; wherein the rotor is selectively connected with the first gear ring or the second sun gear; a second brake coupled with the second ring gear; a wheel brake for providing a braking force to a wheel; and the power input end of the wheel brake driving mechanism is fixedly connected with the second planet carrier, and the power output end of the wheel brake driving mechanism is connected with the wheel brake.

Description

A wheel hub drive and brake integrated device with dual motors

technical field

The invention belongs to the technical field of vehicle drive and brake integration, in particular to a wheel hub drive and brake integration device with dual motors.

Background technique

At present, the drive system of pure electric vehicles mainly adopts a central drive scheme, which uses a drive motor instead of an internal combustion engine. The power output by the drive motor is transmitted to the wheels through the drive train. A part of the energy will be consumed during the transmission process, and the efficiency and utilization rate is low, which is not conducive to Efficient utilization of vehicle energy. The distributed drive scheme of pure electric vehicles uses in-wheel motors to directly drive the wheels, which can effectively improve the energy efficiency of electric vehicles.

As a new type of vehicle braking equipment, electromechanical braking can play a function that the general hydraulic braking system does not have. Especially at present, with the continuous advancement of new technologies and the improvement of automotive electronic equipment, in the industrial production of vehicles, the electro-mechanical braking system can meet the development needs of vehicle braking technology.

SUMMARY OF THE INVENTION

Aiming at distributed drive vehicles, the present invention combines electronic mechanical braking and in-wheel motor regenerative braking to provide an integrated device for in-wheel drive and braking with dual motors. Therefore, the whole vehicle can maintain high-efficiency driving in a wide torque range, and at the same time, electric motor braking and hydraulic compound braking can be performed to improve braking efficiency and improve the energy utilization rate of the vehicle.

The technical scheme provided by the present invention is:

A wheel hub drive and brake integrated device with dual motors, comprising:

a first motor having a power take-off shaft;

a first planetary row, which includes a first sun gear, a first planetary gear, a first planet carrier and a first ring gear;

Wherein, the power output shaft is fixedly connected with the first sun gear, and the first planet carrier is fixedly connected with the wheel rim;

a first brake, which is selectively coupled to or disengaged from the first ring gear;

a second drive motor including a stator and a rotor;

The second planetary row includes a second sun gear, a second planetary gear, a second planet carrier and a second ring gear;

Wherein, the rotor is selectively connected to the first ring gear or the second sun gear;

a second brake combined with the second ring gear;

Wheel brakes, which are used to provide braking force to the wheels;

In the wheel brake driving mechanism, the power input end is fixedly connected with the second planet carrier, and the power output end is connected with the wheel brake.

Preferably, the wheel brakes include:

a shell with an accommodating cavity inside;

a brake piston, which is movably arranged in the accommodating cavity;

a piston push rod, one end of which is fixedly connected with one end of the brake piston; the other end is axially movable through one end of the housing, and is fixedly connected with the power output end;

a friction plate assembly, disposed in the housing and in contact with the other end of the piston;

Wherein, when the brake piston shaft moves toward the friction plate assembly, the friction plate assembly is squeezed to generate frictional force to realize wheel braking.

Preferably, the brake pad assembly includes:

a plurality of sliding friction plates and a plurality of rotating friction plates; the rotating friction plates and the sliding friction plates are spaced apart from each other;

Wherein, the sliding friction plate is in contact with the piston.

Preferably, the wheel brake further comprises:

a wheel brake disc, which is arranged outside the casing and is fixedly connected with the wheel rim;

a wheel brake hub, one end of which is arranged in the housing;

Wherein, the other end of the casing is provided with a through hole, and the other end of the wheel brake drum protrudes from the through hole and is fixedly connected with the wheel brake disc;

The rotating friction plate is sleeved on the wheel brake drum through spline matching, so that the rotating friction plate rotates synchronously with the wheel brake disc and can move along the axial direction of the wheel brake hub.

Preferably, the wheel braking and driving mechanism includes:

a lead screw, which is fixedly connected with the second planet carrier;

a ball nut, which is matched and connected to the lead screw;

Wherein, the ball nut is fixedly connected with the piston push rod.

Preferably, the in-wheel drive and brake integrated device with dual motors further includes:

a support shaft, which is fixedly connected to the casing;

Wherein, the lead screw has a central through hole, and is rotatably supported on the support shaft through the central through hole.

Preferably, the in-wheel drive and brake integrated device with dual motors further includes:

A first clutch, which is arranged between the first ring gear and the rotor, is used to connect or separate the first ring gear and the rotor.

Preferably, the in-wheel drive and brake integrated device with dual motors further includes:

A second clutch is provided between the second sun gear and the rotor for connecting or separating the second sun gear and the rotor.

The beneficial effects of the present invention are:

The wheel hub drive and brake integrated device with dual motors provided by the present invention combines the drive system with the brake system. The two motors in the integrated device serve as drive motors when the vehicle is running normally, and serve as brakes when the vehicle is braking. The motor can effectively improve the utilization rate of the motor and the utilization rate of the radial space of the wheel rim, and make the integrated device compact in structure. The use of dual motors to drive the wheel hub reduces the torque load of each drive motor, so that the vehicle can maintain efficient driving in a wide torque range. At the same time, the combination of electronic mechanical braking and wheel hub motor regenerative braking can improve the vehicle The braking performance can effectively improve the energy utilization rate of the vehicle, shorten the action time of the vehicle braking process, and improve the braking performance and driving safety of the vehicle.

Description of drawings

FIG. 1 is a schematic structural diagram of the wheel hub drive and brake integrated device with dual motors according to the present invention.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

As shown in FIG. 1 , the present invention provides a wheel hub drive and brake integrated device with dual motors, and the reference numerals are described as follows:

1—the first motor (MG1), 2—connecting shaft, 3—the first planetary row sun gear, 4—the first planetary row planetary gear, 5—the first planetary row planet carrier, 6—the first planetary row ring gear, 7—rim, 8—first brake (brake B1), 9—first clutch (clutch C1), 10—second motor outer rotor, 11—second motor inner stator, 12—second clutch (clutch C2), 13—the second planetary row sun gear, 14—the second brake (brake B2), 15—the second planetary row ring gear, 16—the second planetary row planetary gear, 17—the second planetary row planet carrier, 18—the nut, 19—ball, 20—lead screw, 21—ball screw pair support shaft, 22—push rod, 23—brake piston, 24—wheel brake disc, 25—wheel brake hub, 26—sliding friction plate, 27 - Rotating friction plate, 28 - Wheel brake housing.

The wheel hub drive and brake integrated device system with dual motors provided by the present invention is composed of two motors, two planetary rows, two clutches, two brakes, a ball screw pair, a wheel brake and the like.

The first motor (MG1) 1 is the main driving motor, which provides the main driving force for the wheel drive system; the first motor 1 integrates the functions of a motor and a generator. When the wheel decelerates or brakes, the power supply of the first motor 1 is cut off, and the first motor 1 rotates by inertia. At this time, the first motor 1 is a generator (power generation mode), and the kinetic energy generated by wheel braking is converted into electrical energy and stored in the In the battery, the kinetic energy of the wheels drops rapidly at the same time, which is equivalent to braking and realizes the regenerative braking function.

The second motor (MG2) is an outer rotor drive motor, which is composed of an inner stator 11 of the motor and an outer rotor 10 of the motor. The second motor is an auxiliary drive motor, which provides auxiliary driving force for the wheel drive system. At the same time, the second motor acts as a brake motor to provide braking force for the wheel braking system.

The first planetary row is composed of sun gear 3 , planetary gear 4 , planet carrier 5 and ring gear 6 . The first motor 1 is connected with the connecting shaft 2 , and the connecting shaft 2 is connected with the first planetary row sun gear 3 , and the power output by the first motor 1 can be transmitted to the first planetary row sun gear 3 through the connecting shaft 2 . The first planetary ring gear 6 is connected to the first brake 8 and the first clutch 9 .

The second planetary row is composed of the sun gear 13 , the planetary gears 16 , the planet carrier 17 and the ring gear 15 . The second planetary sun gear 13 is connected with the second motor outer rotor 10 through the second clutch 12 , the second planetary carrier 17 is connected with the lead screw 19 in the ball screw pair, and the second planetary ring gear 15 is connected with The second brake 14 is connected.

The first brake 8 is a normally closed brake and is connected with the first planetary ring gear 6 ; the second brake 14 is a normally closed brake and is connected with the second planetary ring gear 15 .

The first clutch 9 and the second clutch 12 are both normally open clutches, and are connected to the outer rotor 10 of the second motor at the same time.

The ball screw pair consists of a screw 20 , a ball 19 and a nut 18 . The lead screw 20 in the ball screw pair is connected with the second planetary row 17 of the planet carrier, and the nut 18 is connected with the push rod 22 .

The wheel brake is composed of a brake piston 23 , a wheel brake disc 24 , a wheel brake hub 25 , a sliding friction plate 26 , a rotating friction plate 27 , and a wheel brake housing 28 . The sliding friction plate 26 is spaced apart from the rotating friction plate 27 . Among them, the sliding friction plate 26 can be axially installed on the wheel brake housing 28; the rotating friction plate 27 is sleeved on the brake drum 25 through spline matching, so that the rotating friction plate 27 and the brake hub 25 rotate synchronously, And can move along the axial direction of the brake hub 25 ; the brake hub 25 is fixedly connected with the brake disc 24 .

When the screw 20 rotates to drive the nut 18 to move axially, when the nut 18 moves axially, it drives the push rod 22 to move. The plates 27 are pressed against each other and generate frictional force, so that the rotating rotating friction plates 27, the wheel brake hub 25, and the wheel brake disc 24 all stop rotating, so that the wheels are braked. When the braking is completed, the second motor (MG2) is reversed, the pressure of the brake piston 23 acting on the sliding friction plate 26 and the rotating friction plate 27 is released, the friction force disappears, and the braking is released.

When the first brake 8 is disconnected and the first clutch 9 is closed, the power output by the first motor 1 and the second motor is input by the sun gear 3 and the ring gear 6 of the first planetary row, and after coupling, the planetary gear of the first planetary row The frame 5 is output to the rim 7, and at this time, the first motor 1 and the second motor jointly drive the wheel to travel.

The components of the drive and brake integrated system work according to Table 1.

Table 1 Schematic diagram of driving and braking control components

In the table, "○" indicates separation, and "•" indicates engagement.

The specific working principles of several driving and braking modes are as follows:

1. Drive control

1) The first motor (MG1) is driven alone

When the first motor 1 is driven alone, the first motor 1 works, the second motor does not work, the first brake 8 is in an engaged state, and the first planetary ring gear 6 is fixed. The power of the whole vehicle is provided by the first motor 1, transmitted to the first planetary row sun gear 3 through the connecting shaft 2, and then transmitted to the rim 7 through the first planetary row planetary wheel 4 and the first planetary row planetary carrier 5 to drive the wheels. .

2) The first motor (MG1) and the second motor (MG2) are driven at the same time

When the first motor and the second motor are driven simultaneously, the first motor 1 works, the second motor works, the first brake is in a disengaged state, and the first clutch 9 is in an engaged state. The power of the whole vehicle is provided by the first motor 1 and the second motor, the power provided by the first motor 1 is transmitted to the first planetary row sun gear 3 through the connecting shaft 2; the power provided by the second motor is transmitted to the third motor through the first clutch 9. A planetary ring gear 6 . At this time, in the first planetary row, the sun gear 3 and the ring gear 6 are the power input ends, and the planet carrier 5 is the power output end.

2. Brake control

1) Pure motor regenerative braking (the first motor regenerative braking)

When the car brakes at a small intensity, the braking intensity requirement is low at this time. In order to have a higher braking energy recovery rate, the pure motor regenerative braking mode is generally selected;

When entering the pure motor regenerative braking mode, the braking energy is converted into electrical energy through the first motor 1, and the first motor works as a generator; at this time, the first brake 8 is in the engaged state, the first clutch 9 is in the disengaged state, and the first The planetary ring gear 6 is fixed.

When the vehicle decelerates or brakes, the power supply of the first motor 1 is cut off, and the first motor 1 rotates by inertia. At this time, through circuit switching, the power of the excitation power provided to the rotor of the first motor is small, and a magnetic field is generated, and the magnetic field is The windings of the stator of the first motor are cut by the physical rotation of the rotor of the first motor, so that the stator of the first motor generates an induced electromotive force, also called a back electromotive force, the motor reverses, and the function is the same as that of a generator. The first motor 1 is a generator, and the generated current is connected to the battery through the power inverter, which is energy feedback, and the braking energy recovery process is completed; verb: move.

2) Electromechanical brake (second motor electromechanical brake)

When entering electromechanical braking mode, turn off the motor regenerative braking system.

The braking system is in a purely mechanical braking mode, the first motor 1 does not work, the second motor works, the second clutch 12 is in an engaged state, and the second brake 14 is in an engaged state. The braking force is provided by the second electric motor and transmitted to the second planetary sun gear 13 through the second clutch 12 .

In the second planetary row, the braking force is input by the sun gear 13 and output from the planet carrier 17 to the lead screw 20 . When the lead screw 20 rotates, the ball 19 drives the nut 18 to move laterally. The nut 18 pushes the push rod 22 to drive the brake piston 23 to move laterally, so that the brake piston 23 generates a clamping force, the sliding friction plate 26 and the rotating friction plate 27 are pressed against each other and generate frictional force, so that the rotating rotating friction plate 27 and the wheel Both the brake hub 25 and the wheel brake disc 24 stop rotating to generate braking force.

3) Compound braking (MG1 motor regenerative braking and MG2 electromechanical braking)

When the car brakes with a large strength, the requirements for the braking strength are higher at this time, and the braking stability should be given priority, and the compound braking mode is generally selected.

When entering the compound braking mode, the first motor 1 works as a generator, and the second motor works normally.

When the power supply of the first motor 1 is cut off, the first motor 1 rotates by inertia, and when the motor is regeneratively braked, the braking energy is converted into electric energy through the first motor 1 . The first brake 8 is in an engaged state, the first clutch 9 is in a disengaged state, and the first planetary ring gear 6 is fixed; the motor regenerative braking force is provided by the first motor 1 .

At the same time, the second motor operates, the second clutch 12 is in an engaged state, and the second brake 14 is in an engaged state. The mechanical braking force is provided by the second motor, and is transmitted to the sun gear 13 of the second planetary row through the second clutch 12. After passing through the second planetary row, it is output to the lead screw 20 by the planet carrier 17, and is pushed and pushed by the nut 18 in the ball screw pair. The rod 22 drives the brake piston 23 to move laterally, so that the brake piston 23 generates a clamping force, so that the friction plate components are pressed against each other and generate friction force, so that the rotating rotating friction plate 27, the wheel brake hub 25, the wheel brake disc 24 stop turning, generating braking force.

4) Parking brake

The parking brake shares a system with the electromechanical brake.

When the vehicle performs the parking brake, the first motor 1 does not work, the second motor works, the second clutch 12 is in an engaged state, and the second brake 14 is in an engaged state. The braking force is provided by the second electric motor and transmitted to the second planetary sun gear 13 through the second clutch 12 .

In the second planetary row, the braking force is input by the sun gear 13 and output from the planet carrier 17 to the lead screw 20 . When the lead screw 20 rotates, the ball 19 drives the nut 18 to move laterally. The nut 18 pushes the push rod 22 to drive the brake piston 23 to move laterally, so that the brake piston 23 generates a clamping force to realize the parking brake.

Although the embodiment of the present invention has been disclosed as above, it is not limited to the application listed in the description and the embodiment, and it can be applied to various fields suitable for the present invention. For those skilled in the art, it can be easily Therefore, the invention is not limited to the specific details and illustrations shown and described herein without departing from the general concept defined by the appended claims and the scope of equivalents.

Claims (8)

1. A hub driving and braking integrated device with double motors is characterized by comprising:

a first motor having a power output shaft;

the first planet row comprises a first sun gear, a first planet carrier and a first gear ring;

the power output shaft is fixedly connected with the first sun gear, and the first planet carrier is fixedly connected with a rim;

a first brake selectively engaged with or disengaged from the first ring gear;

a second drive motor including a stator and a rotor;

the second planet row comprises a second sun gear, a second planet carrier and a second gear ring;

wherein the rotor is selectively connected with the first gear ring or the second sun gear;

a second brake coupled with the second ring gear;

a wheel brake for providing a braking force to a wheel;

and the power input end of the wheel brake driving mechanism is fixedly connected with the second planet carrier, and the power output end of the wheel brake driving mechanism is connected with the wheel brake.

2. The integrated hub driving and braking device with two motors as claimed in claim 1, wherein the wheel brake comprises:

a housing having an accommodating cavity therein;

a brake piston movably disposed in the receiving cavity;

one end of the piston push rod is fixedly connected with one end of the brake piston; the other end of the power output shaft penetrates through one end of the shell in an axially movable mode and is fixedly connected with the power output end;

a friction plate assembly disposed within the housing and contacting the other end of the piston;

when the brake piston shaft moves towards the friction plate assembly, the friction plate assembly is squeezed to generate friction force, and wheel braking is achieved.

3. The integrated hub driving and braking device with two motors according to claim 2, wherein the brake pad assembly comprises:

a plurality of sliding friction plates and a plurality of rotating friction plates; the rotating friction plate and the sliding friction plate are arranged at intervals;

wherein the sliding friction plate is in contact with the piston.

4. The integrated hub drive and brake device with dual motors of claim 3, wherein the wheel brake further comprises:

a wheel brake disc disposed outside the housing and fixedly connected to the rim;

a wheel brake hub having one end disposed within the housing;

the other end of the shell is provided with a through hole, and the other end of the wheel brake drum extends out of the through hole and is fixedly connected with the wheel brake disc;

the rotary friction plate is sleeved on the wheel brake drum through a spline in a matching mode, so that the rotary friction plate and the wheel brake disc synchronously rotate and can axially move along the wheel brake hub.

5. The integrated hub driving and braking device with two motors as claimed in any one of claims 2 to 4, wherein the wheel braking driving mechanism comprises:

the lead screw is fixedly connected with the second planet carrier;

the ball nut is connected to the lead screw in a matching manner;

wherein, ball nut with piston push rod fixed connection.

6. The integrated hub driving and braking device with two motors as claimed in claim 5, further comprising:

the supporting shaft is fixedly connected to the shell;

wherein the lead screw has a central through hole and is rotatably supported on the support shaft through the central through hole.

7. The integrated hub driving and braking device with two motors as claimed in claim 6, further comprising:

a first clutch provided between the first ring gear and the rotor for connecting or disconnecting the first ring gear with or from the rotor.

8. The integrated hub driving and braking device with two motors as claimed in claim 7, further comprising:

a second clutch provided between the second sun gear and the rotor for connecting or disconnecting the second sun gear to or from the rotor.

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