CN107757380A - A kind of integrated electric energy assisted braking system - Google Patents

Abstract

The invention provides an integrated electric power-assisted braking system, which includes a motor, a planetary gear set, and a ball screw mechanism. The planetary wheels in the planetary gear set are connected to the nuts in the roller screw mechanism. The disc and booster push rod are connected to the output shaft of the master cylinder. There is a pedal travel sensor on the pedal push rod. The master cylinder is connected to the hydraulic control unit through hydraulic pipelines, pressure sensors and two two-position two-way solenoid valves. The brake pipeline is connected with the four disc brakes on the vehicle, the pedal stroke sensor, the two-position two-way solenoid valve, the hydraulic control unit, and the pressure sensor are connected with the electronic control unit of the vehicle; The multi-stage transmission mechanism realizes the effect of deceleration and torque increase, and converts the rotational output of the motor into translational output, with large transmission ratio, high transmission precision, high transmission efficiency and compact structure.

Description

An integrated electric power-assisted braking system

technical field

The invention belongs to the field of automobile braking devices in the field of vehicle engineering, and relates to an integrated electric power-assisted braking system.

Background technique

With the rapid development of electric vehicles and smart vehicles, the traditional vacuum booster hydraulic braking system can no longer meet the requirements. Since the electric power-assisted braking system cancels the vacuum booster commonly used in traditional vehicles, and can realize the decoupling of frictional braking force and regenerative braking force, and has a simple structure and convenient layout, it will become an inevitable direction for the development of braking systems.

The system shown in the patent CN 104709096A uses a worm gear and a rack and pinion as a torque reduction mechanism. The transmission efficiency of the worm gear is low, the wear is serious, and the axial force of the worm is relatively large; A certain deflection force is generated, which can easily lead to excessive resistance or even jamming of the mechanism. Moreover, the force of human and motor cannot be decoupled, which may easily lead to system failure.

The system shown in the patent CN 104118416A adopts the single-stage deceleration of the nut ball screw, and the reduction ratio is small, so the requirements for the output power and output torque of the motor are relatively high, so the motor size is large and the production cost is high; in addition, because the rotor of the motor It is not fixed so it can deflect causing excessive radial force.

The system shown in patent CN 106240552A adopts a two-stage transmission mode of spur gears and nut ball screws, but due to the large number of transmission pairs, the axial dimension of the entire system is relatively long, which is not conducive to the layout of the vehicle .

Contents of the invention

In order to overcome the defects of inefficient transmission scheme, small transmission ratio and large structural size in the prior art, the present invention provides an integrated electric power-assisted braking system.

An integrated electric power-assisted braking system is characterized in that it includes a motor housing and a planetary gear housing, the direction of the driver's braking force input is the front, and the motor housing and the planetary gear housing pass through A middle end cover with a circular through hole in the middle is fixed, the front end of the planetary gear housing is covered by a front end cover, a motor is arranged in the motor housing, the motor includes a motor stator and a motor rotor, and a hollow stepped shaft-shaped rear The front section of the end cover is a small journal section, the rear section of the rear end cover is a large journal section, the small journal section of the rear end cover extends into the inside of the motor housing, and the rear end of the motor housing is formed by the large The journal section is covered, and the motor stator is fixed inside the motor housing. There is a motor rotor with a shaft hole inside the motor stator. The shaft hole of the motor rotor is set on the outer cylindrical surface of the small journal section of the rear end cover. There is an annular bearing fixing ring perpendicular to the end face on the front end of the large journal section of the rear end cover, and an annular bearing fixing ring perpendicular to the end face on the rear end face of the middle end cover. The motor rotor passes through an angle The contact ball bearing is supported in the bearing fixing ring on the rear end cover, and the motor rotor is supported in the bearing fixing ring on the middle end cover through another angular contact ball bearing; there is a planetary gear set inside the planetary gear housing, and the planetary gear set It consists of a ring gear fixed in the planetary gear housing, a sun gear concentric with the ring gear and located inside the circumference of the ring gear, and four planetary gears evenly arranged between the ring gear and the sun gear. The ring gear meshes with the sun gear. The rear end of the sun gear is located in the circular through hole of the middle end cover and is fixedly connected with the front end of the motor rotor by screws. A nut is a hollow stepped rotating part, and the front part of the nut is a small shaft. The back section of the nut is the large journal section, and the inner cylindrical surface of the nut is processed with an arc-shaped spiral groove. Each planetary wheel is assembled with the large journal section of the nut through a planetary wheel shaft, and the small journal section of the nut is assembled through two A tapered roller bearing is supported inside the planetary gear housing. A hollow screw is a hollow cylindrical rotating part. The outer cylindrical surface of the hollow screw is also processed with arc-shaped spiral grooves. The arc on the outer cylindrical surface of the hollow screw The hollow screw, the nut and the spherical balls form a ball screw mechanism. The rear end of the pedal push rod passes through the hollow part of the hollow screw, the rear end surface of the hollow screw is axially grooved, and the front end of a booster push rod located in the hollow part of the rear end cover is installed behind the hollow screw with clearance In the groove on the end face, the front end of the pedal push rod is fixedly connected with the rear end of a pedal push rod connector, the front end of the pedal push rod connector is used to connect the brake pedal of the vehicle, and a pedal travel sensor includes a pedal travel sensor body and a sliding magnet slidingly matched with the main body of the pedal stroke sensor, the main body of the pedal stroke sensor is fixedly connected with the vehicle frame, the sliding magnet is fixed between the rear end face of the pedal push rod connector and the front end face of the pedal push rod, the front end of the pedal push rod is connected to the front end of the pedal push rod A first return spring is arranged between the front end faces of the front end cover, a return block is set in the middle of the booster push rod, and a master cylinder is fixed on the rear end cover. The plug push rod extends into the hollow part of the front section of the rear end cover, the piston push rod is fixedly connected with the rear end of the booster push rod, and a second return spring is arranged between the front end surface of the master cylinder and the rear end surface of the return block, and the master cylinder Fixed on the rear end cover, the two liquid inlets of the master cylinder are connected with a liquid storage tank, and one liquid outlet of the master cylinder is connected with the liquid inlet of a No. 1, 2-position, 2-way solenoid valve through a hydraulic pipeline. The other liquid outlet of the cylinder is connected with the liquid inlet of a three-way pipe joint through the hydraulic pipeline, and one liquid outlet of the three-way pipe joint is connected with the liquid inlet of a pressure sensor through the hydraulic pipeline, and the three-way pipe joint The other liquid outlet of the No. 1 two-position two-way solenoid valve is connected to the liquid inlet port of a No. 2 two-position two-way solenoid valve through a hydraulic pipeline, and the liquid outlet port of the No. 1 two-position two-way solenoid valve is connected to an inlet port of a hydraulic control unit through a hydraulic pipeline. The liquid outlet of the No. 2 two-position two-way solenoid valve is connected to the other liquid inlet of the hydraulic control unit through the hydraulic pipeline, and the four liquid outlets of the hydraulic control unit are respectively connected to the installation brake hydraulic pipeline. The liquid inlets of the four disc brakes on the four wheels of the vehicle are connected, the signal output terminals of the pedal stroke sensor and the pressure sensor are respectively connected with the signal input terminals of the electronic control unit in the vehicle through data lines, and the motor, No. 1 and No. 2 The respective signal receiving ends of the 1-position 2-way solenoid valve, the No. 2 2-position 2-way solenoid valve and the hydraulic control unit are respectively connected to the output ends of the electronic control unit through data lines.

Further technical solutions include:

The sun gear is a hollow stepped structure, the front part of the sun gear is a small journal section, the rear section is a large journal section, there is an undercut groove between the front section and the rear section, and the small journal section of the sun gear has a There are four threaded holes on the gear teeth and the large journal section with the rotation axis of the sun gear as the center line, and four threaded holes are also opened on the front surface of the motor rotor corresponding to the four threaded holes on the sun gear. The large journal section of the sun gear is fixedly connected with the front end face of the motor rotor through screws.

There is a pedal push rod connecting shaft protruding forward on the front end of the pedal push rod. The connecting shaft of the pedal push rod is provided with external threads, and the rear end of the pedal push rod connecting piece is provided with internal threads. The pedal push rod is connected through the pedal push rod. The shaft is threaded with the pedal push rod connector for transmitting braking force.

The booster push rod is a stepped cylindrical revolving body, the front section of the booster push rod is a large journal section, and the large journal section has a cylindrical blind hole with the rotation axis of the booster push rod as the center line, and the blind hole A cylindrical elastic reaction disc is arranged inside, and the height of the elastic reaction disc is greater than the depth of the blind hole of the booster push rod. There is a threaded hole on the center line, and the piston push rod has an external thread. The small journal section of the booster push rod is threadedly connected with the piston push rod, and the large journal section of the booster push rod is installed on the rear end surface of the hollow screw with clearance fit. in the groove.

The return block is a hollow cylindrical stepped rotary part, the front section of the return block is a large journal section, and the rear section is a small journal section, and the return block is set on the small journal section of the booster push rod. The front end surface of the large journal section of the return block is in contact with the rear end surface of the large journal section of the booster push rod, and the second return spring is arranged between the front end surface of the master cylinder and the rear end surface of the small journal section of the return block. between.

The motor stator has uniformly distributed bar-shaped slots on its outer cylindrical surface along the direction of the axis of rotation. Bar-shaped pins are arranged in the motor housing at positions corresponding to the motor stator. The bar-shaped slots of the motor stator and the motor The strip-shaped pins in the casing are interference fit, so that the motor stator is fixed in the motor casing. The motor rotor is provided with a protrusion in the middle, and the front side of the protrusion is supported on the middle end cover through an angular contact ball bearing. The raised rear side is supported on the right end cover through another angular contact ball bearing, the motor rotor and the angular contact ball bearing are installed in a transition fit, and the angular contact ball bearing is installed in a transition fit with the middle end cover and the right end cover.

There is an annular protrusion on the outer cylindrical surface of the front end of the pedal push rod, and the first return spring is arranged between the annular protrusion and the front end surface of the front end cover.

Both the first return spring and the second return spring are conical springs.

Compared with prior art, the beneficial effects of the present invention are:

1. The integrated electric power-assisted braking system of the present invention uses a hollow motor as a power source, uses a two-stage transmission mechanism to realize deceleration and torque increase, and converts the rotational output of the motor into a translational output. The first-stage transmission device is a planetary gear mechanism, and the second stage is a ball screw mechanism, with large transmission ratio, high transmission precision, high transmission efficiency and compact structure, which can significantly improve the braking performance of the vehicle.

2. The electric power-assisted braking system of the present invention can not only improve the braking performance of the vehicle, but also can implement functions such as active braking, failure backup and braking energy recovery, and can also effectively integrate electronic stability program (ESP), automatic Adapt to active control technologies such as cruise control (ACC) to realize intelligent vehicle control.

3. The planetary gear carrier in the primary transmission mechanism of the present invention is integrated with the nut in the secondary transmission mechanism, so the number of parts can be effectively reduced and the structure is more compact.

4. The motor casing of the present invention is structurally processed so that the front section of the master cylinder can extend into the hollow part of the rear end cover, effectively reducing the axial size of the electric power-assisted braking system.

5. The elastic reaction disc of the present invention is placed in the blind hole of the booster push rod, which has good wrapping performance and prevents potential safety hazards caused by excessive deformation of the reaction disc due to excessive radial force.

6. The integrated electric power-assisted braking system of the present invention has made minor changes on the basis of the existing braking system, which is convenient for installation in real vehicles, has good portability, and is easy to test and experiment with external equipment.

Description of drawings

Below in conjunction with accompanying drawing, the present invention will be further described:

Fig. 1 is a schematic structural diagram of an integrated electric power-assisted braking system according to the present invention;

Fig. 2 is a schematic structural diagram of the power coupling part in an integrated electric power-assisted braking system according to the present invention;

Fig. 3 is an isometric view of a sun gear in an integrated electric power-assisted braking system according to the present invention;

Fig. 4 is an isometric view of a booster push rod in an integrated electric power booster braking system according to the present invention;

Fig. 5 is a schematic diagram of the assembly relationship between the pedal stroke sensor, the pedal push rod connector and the pedal push rod in an integrated electric power-assisted braking system according to the present invention;

Fig. 6 is a schematic diagram of the connection between the pressure sensor and the three-way pipe joint in an electric power-assisted braking system according to the present invention.

In the figure: 1. Pedal push rod connector, 2. First return spring, 3. Front end cover, 4. Planetary gear housing, 5. Tapered roller bearing, 6. Planetary gear shaft, 7. Planetary gear, 8 .Middle end cover, 9. Motor housing, 10. Angular contact ball bearing, 11. Rear end cover, 12. Pedal push rod, 13. Hollow screw, 14. Spherical ball, 15. Nut, 16. Sun gear , 17. Ring gear, 18. Motor rotor, 19. Motor stator, 20. Elastic reaction disc, 21. Booster push rod, 22. Return block, 23. Master cylinder 23, 24. Piston push rod, 25. Second Return spring, 26. Fluid storage tank, 27. No. 1 two-position, two-way solenoid valve, 28. No. 2, two-position, two-way solenoid valve, 29. Hydraulic control unit, 30. Disc brake, 31. Pedal travel sensor body , 32. Pressure sensor, 33. Sliding magnet, 34. Tee pipe joint.

Detailed ways

The present invention is described below in conjunction with accompanying drawing:

Referring to FIG. 1 , an integrated electric power-assisted braking system according to the present invention includes a motor housing 9 , a planetary gear housing 4 and a middle end cover 8 . Take the direction of the driver's braking force input as the front. The rear end face of the planetary gear housing 4, the middle end cover 8, and the front end face of the motor housing 9 are evenly distributed with four threaded holes of the same specification. The front end faces of the machine housing 9 are connected by bolts and nuts. The front end of the planetary gear housing 4 is covered by a front end cover 3, and the two are connected by screws.

Referring to Fig. 1, a motor is arranged in the motor housing 9, and the motor includes a motor stator 19 and a motor rotor 18. It is a large journal section, and the small journal section of the rear end cover 11 stretches into the motor housing 9 inside, and the rear end of the motor housing 9 is covered by the large journal section of the rear end cover 11. The motor stator 19 is provided with evenly distributed bar-shaped grooves along the direction of the axis of rotation on its outer cylindrical surface. The motor housing 9 is provided with bar-shaped pins at positions corresponding to the motor stator 19. The bar-shaped grooves of the motor stator 19 The slot and the bar-shaped pin in the motor housing 9 have an interference fit, so that the motor stator 19 is fixed in the motor housing 9 .

Referring to Fig. 1, a motor rotor 18 with a shaft hole is arranged in the motor stator 19, and the shaft hole of the motor rotor 18 is set on the outer cylindrical surface of the small journal section of the rear end cover 11, and the large journal of the rear end cover 11 There is a ring-shaped bearing fixing ring perpendicular to the end face on the front end of the section, and a ring-shaped bearing fixing ring perpendicular to the end face on the rear end face of the middle end cover 8. The motor rotor 18 is supported by an angular contact ball bearing 10 In the bearing fixing ring on the rear end cover 11 , the motor rotor 18 is supported in the bearing fixing ring on the middle end cover 8 through another angular contact ball bearing 10 of the same specification.

Referring to Fig. 1, there is a planetary gear set inside the planetary gear housing 4, and the planetary gear set includes a ring gear 17 fixed in the planetary gear housing 4, a sun gear concentric with the ring gear 17 and located inside the circumference of the ring gear 17. Wheel 16 and four planetary gears 7 evenly arranged between the ring gear 17 and the sun gear 16, each planetary gear 7 meshes with the ring gear 17 and the sun gear 16 at the same time, and the four planetary gears 7 can respectively rotate around their own axes , can revolve around the axis of rotation of the sun gear 16 again.

Referring to Figures 1 and 3, the sun gear 16 is a hollow stepped structure, the front section of the sun gear 16 is a small journal section, the rear section is a large journal section, and an undercut is left between the front section and the rear section. The small journal section of the sun gear 16 has gear teeth, and the large journal section has four threaded holes evenly with the axis of rotation of the sun gear 16 as the center line. There are also four threaded holes at the positions corresponding to the threaded holes, and the large journal section of the sun gear 16 is fixedly connected with the front end surface of the motor rotor 18 by screws.

Referring to Fig. 1, a nut 15 is a hollow stepped rotary part, the front section of the nut 15 is a small journal section, the rear section of the nut 15 is a large journal section, and the inner cylindrical surface of the nut 15 is processed with an arc-shaped spiral groove, each A planetary wheel 7 is assembled with a large journal section of a nut 15 through a planetary wheel shaft 6, and a small journal section of the nut 15 is supported inside the planetary gear housing 4 through two tapered roller bearings 5, and a hollow screw 13 is hollow The cylindrical rotary part of the hollow screw 13 is also processed with an arc-shaped spiral groove on the outer cylindrical surface of the hollow screw 13. The arc-shaped spiral groove on the outer cylindrical surface of the hollow screw 13 matches the arc-shaped spiral groove on the inner cylindrical surface of the nut 15. , forming a spiral channel, in which a plurality of spherical balls 14 are placed, and the hollow screw 13, the nut 15 and the spherical balls 14 form a ball screw mechanism. When the nut 15 rotates around its own axis, the ball 14 is pushed to roll in the spiral channel, and the hollow screw 13 is pushed to move along its axial direction.

Referring to Fig. 1 and Fig. 2, the rear end of a cylindrical pedal push rod 12 passes through the hollow part of the hollow screw 13, and the rear end surface of the hollow screw 13 has a groove along the axial direction. The booster push rod 21 is a stepped cylindrical revolving body, the front section of the booster push rod 21 is a large journal section, and the large journal section has a cylindrical blind hole with the rotation axis of the booster push rod 21 as the center line , the blind hole is built with a cylindrical elastic reaction disc 20, the height of the elastic reaction disc 20 is greater than the depth of the blind hole of the booster push rod 12, the rear section of the booster push rod 21 is a small journal section, and the small journal section is used to boost The axis of rotation of the push rod 21 has a threaded hole as the center line, and the piston push rod 24 has an external thread. The segment gap fits in the groove on the rear end face of the hollow lead screw 13 .

Referring to Fig. 5, there is a pedal push rod connecting shaft protruding forward on the front end surface of the pedal push rod 12. The pedal push rod connecting shaft is provided with external threads, and the rear end of the pedal push rod connector 1 is provided with internal threads. The rod 12 is threadedly connected with the pedal push rod connector 1 through the pedal push rod connecting shaft, and is used for transmitting braking force.

Referring to Fig. 5, a pedal travel sensor includes a pedal travel sensor main body 31 and a sliding magnet 33 slidingly fitted with the pedal travel sensor main body 31, the pedal travel sensor main body 31 is fixedly connected to the vehicle frame, and the sliding magnet 33 is fixed to the pedal push rod to connect Between the rear end surface of the part 1 and the front end surface of the pedal push rod 12, and the pedal push rod connecting part 1 can be twisted to clamp the sliding magnet 33. The sliding magnet 33 can move along the axial direction with the pedal push rod 12 while the main body of the pedal stroke sensor 31 remains still, so that the relative displacement of the two, that is, the displacement of the pedal push rod 12 can be measured. The pedal stroke sensor is selected from the MTS-RP series stroke sensor, and the shell is an aluminum molded shell with high strength, which meets the actual vehicle use environment. The resolution is 2μm, and the measurement stroke is 25-4975mm, which meets the requirements of real vehicles.

Referring to Fig. 1 and Fig. 2, there is an annular protrusion on the outer cylindrical surface of the front end of the pedal push rod 12, and the conical first return spring 2 is arranged on the annular protrusion and the front end surface of the front end cover 3 between. A return block 22 is set in the middle of the booster push rod 21. The return block 22 is a hollow cylindrical stepped rotary member. The front section of the return block 22 is a large journal section, and the rear section is a small journal section. The return block 22 is sleeved on the small journal section of the booster push rod 21, and the front end face of the large journal section of the return block 22 is in contact with the rear end surface of the large journal section of the booster push rod 21.

Referring to Fig. 1, a master cylinder 23 is fixed on the rear end cover 11, the piston push rod 24 of the master cylinder 23 extends into the hollow part of the front section of the rear end cover 11, and the rear end of the piston push rod 24 and the booster push rod 21 are fixed threads Connected, a conical second return spring 25 is arranged between the front end surface of the master cylinder 23 and the rear end surface of the small shaft diameter section of the return block 22 .

Referring to FIGS. 1 and 6 , the two liquid inlets of the master cylinder 23 are connected to a liquid storage tank 26 . One liquid outlet of the master cylinder 23 is connected with the liquid inlet of a No. 1 two-position two-way solenoid valve 27 through a hydraulic pipeline, and the other liquid outlet of the master cylinder 23 is connected with a three-way pipe joint through another hydraulic pipeline. 34 inlet connection. A liquid outlet of the three-way pipe joint 34 is connected with a liquid inlet of a pressure sensor 32 through a hydraulic pipeline. The pressure sensor 32 is a KELLER-21Y series pressure sensor with a range of 0-30 MPa and a linear accuracy of ± 0.25% FS. Another liquid outlet of the three-way pipe joint 34 is connected with the liquid inlet of a No. 2 two-position two-way solenoid valve 28 through another hydraulic pipeline. The liquid outlet of No. 1 two-position two-way solenoid valve 27 is connected with a liquid inlet of a hydraulic control unit 29 through a hydraulic pipeline, and the liquid outlet of No. two two-position two-way solenoid valve 28 is connected with another hydraulic pipeline through another hydraulic pipeline. Another liquid inlet of the hydraulic control unit 29 is connected. The two two-position two-way solenoid valves are LD8705H normally open solenoid valves with a maximum working pressure of 250bar and a working voltage of 24VDC. The four fluid outlets of the hydraulic control unit 29 are respectively connected with the fluid inlets of the four disc brakes 30 installed on the four wheels of the vehicle through hydraulic pipelines.

Referring to Fig. 1, the signal output ends of the pedal travel sensor 31 and the pressure sensor 32 are respectively connected with the signal input ends of the electronic control unit in the vehicle through the data line, and the motor, No. 1 two-position two-way solenoid valve 27, No. two two-position two-way The respective signal receiving ends of the solenoid valve 28 and the hydraulic control unit 29 are respectively connected with the output ends of the electronic control unit through data lines.

The working principle of an integrated electric power-assisted braking system described in the present invention:

1. Electric power assist function:

The electric power boosting function is the most basic function of the integrated electric power boosting braking system described in the present invention. As shown in Figure 1, when the driver depresses the brake pedal, the pedal push rod connector 1 moves in translation, pushing the pedal push rod 12 to move to the right. At this time, the pedal stroke sensor monitors the displacement of the pedal push rod 12, and The displacement signal is sent to the ECU, and the ECU processes the displacement signal, obtains the power assist value required by the hollow motor at this time according to the power assist characteristic curve, and sends the control command to the motor, and the motor operates according to the command, and the rotor of the motor drives the sun gear 16, Planetary gear 7, planetary gear shaft 6, nut 15, hollow screw 13 motions. The hollow screw 13 moves rightward together with the pedal push rod 12, and pushes the elastic reaction disc 20, booster push rod 21, return block 22, and piston push rod 24 to move rightward, thereby establishing brake fluid pressure in the master cylinder 23 . The brake fluid in the master cylinder 23 flows into the hydraulic control unit 29 through the brake pipeline and two two-position two-way solenoid valves, and then flows into the disc brake 30 through the brake pipeline to build up the brake pressure.

Since the transmission mechanism of an integrated electric power-assisted braking system described in the present invention is a combination of a planetary gear mechanism and a ball screw mechanism, the system can obtain a large reduction ratio, thereby reducing the performance requirements for the motor; When the system performs continuous braking, since the motor can output stable speed and torque, a good braking feeling can be obtained; in addition, when the anti-lock braking system (ABS) is activated, the electric power assist braking system described in the present invention The dynamic system can not only adjust the hydraulic pressure by adjusting the hydraulic control unit 29, but also adjust the output speed and torque of the motor, so as to optimize the response time and dynamic performance of the ABS.

2. Regenerative braking function

For a vehicle equipped with a regenerative braking device, when the vehicle only needs the regenerative braking force generated by the regenerative braking device to complete the braking, the ECU of an integrated electric power braking system according to the present invention issues a corresponding control command Make No. 1, 2-position, 2-way solenoid valve 27 and No. 2, 2-position, 2-way solenoid valve 28 closed. At this time, the brake fluid in the master cylinder 23 will not act on the disc brake 30, that is, the conventional braking mode does not participate in the braking. move to work.

Since the brake pedal and the master cylinder 23 are connected through the pedal push rod connector 1, the pedal push rod 12, the elastic reaction disc 20, the booster push rod 21, and the piston push rod 24, the brake pressure in the master cylinder 23 can be passed through The above components react against the brake pedal to form a feedback of the braking feeling, and there is no need to specially set up a pedal feeling simulator to simulate the braking feeling. In addition, the integrated electric power-assisted braking system described in the present invention can also adjust the pedal feeling by adjusting the action of the motor.

When the vehicle needs a large braking deceleration, if the system judges that the regenerative braking force and friction braking work together to meet the vehicle's braking force requirements, the ECU will issue a control command to make the No. 1, 2-position, 2-way solenoid valve 27 1. The No. 2 2-position 2-way solenoid valve 28 is opened to generate brake fluid pressure in the brake wheel cylinder. At this time, the brake fluid in the master cylinder 23 will still act on the disc brake 30 to generate frictional braking force. At the same time, the regenerative braking device acts to generate regenerative braking force, and the two together constitute the braking force of the vehicle.

3. Failure backup function

When the motor or a transmission part in an integrated electric power-assisted braking system according to the present invention fails due to a fault, the driver depresses the brake pedal, and the pedal push rod connector 1, pedal push rod 12. The elastic reaction disc 20, booster push rod 21, and piston push rod 24 act on the master cylinder 23, thereby establishing brake fluid pressure in the master cylinder 23 to meet the minimum requirements of the vehicle for braking force.

In addition, when the two-position two-way solenoid valve fails, it can still be in the power-off and open state, and the vehicle can still realize the establishment of brake fluid pressure.

4. Active braking function

For vehicles equipped with speed sensor and distance sensor device, when the speed sensor and distance sensor measure that the distance between the vehicle and the obstacle in front is too short and braking measures must be taken to prevent collisions or other dangerous behaviors, the ECU can send a signal to the motor Send the corresponding control command to make the motor rotor 18 start to run. Through the movement of the sun gear 16, the planetary gear 7, the nut 15, the hollow screw 13, the elastic reaction disc 20, the booster push rod 21, and the piston push rod 24, the main cylinder 23 At the same time, the electronic control unit can adjust the hydraulic control unit 29 by reading the brake pressure signal from the pressure sensor 32, and adjust the hydraulic pressure of the wheel cylinders in each disc brake 30 respectively. Realize the active braking function.

Claims (8)

1. a kind of integrated electric energy assisted braking system, it is characterised in that including an electric machine casing (9) and a planetary gear Housing (4), using the direction of operator brake power input as front, pass through one between electric machine casing (9) and planet gear carrier (4) Middle end cap (8) of the individual centre with manhole is fixed, and planet gear carrier (4) front end is covered by a drive end bearing bracket (3), motor It is provided with motor in housing (9), motor includes motor stator (19) and rotor (18), after a hollow ladder shaft-like The leading portion of end cap (11) is pilot pin section, and the back segment of rear end cap (11) is big axle journal section, and the pilot pin section of rear end cap (11) stretches into Electric machine casing (9) is internal, and electric machine casing (9) rear end is closed by the big axle journal section lid of rear end cap (11), and motor stator (19) is fixed on Electric machine casing (9) is internal, and a rotor (18) for carrying axis hole is provided with motor stator (19), rotor (18) Shaft hole sleeve has vertical on the external cylindrical surface of rear end cap (11) pilot pin section on the front end face of the big axle journal section of rear end cap (11) Fixed in the bearing for having the ring-type perpendicular to the end face on the bearing race snap of the ring-type of the end face, the rear end face of middle end cap (8) Ring, rotor (18) are supported in the bearing race snap on rear end cap (11) by an angular contact ball bearing (10), motor Rotor (18) is supported in the bearing race snap on middle end cap (8) by another angular contact ball bearing；Planet gear carrier (4) There are a set of planetary gearsets inside, planetary gearsets include a gear ring (17) being fixed in planet gear carrier (4), one It is concentric with gear ring (17) and positioned at gear ring (17) circumferential inner sun gear (16) and four be uniformly arranged on gear ring (17) and Planetary gear (7) between sun gear (16), each planetary gear (7) while is engaged, sun gear with gear ring (17) and sun gear (16) (16) rear end face is located in the manhole of middle end cap (9) and fixed by the front end face of screw and rotor (18) and connected Connect, a nut (15) is hollow stepped revolving meber, and the leading portion of nut (15) is pilot pin section, and the back segment of nut (15) is Big axle journal section, the inner cylinder face of nut (15) are machined with arc helicla flute, and each planetary gear (7) passes through a planet wheel spindle (6) Assembled with the big axle journal section of nut (15), the pilot pin section of nut (15) is supported on planet by two taper roll bearings (5) Gear housing (4) is internal, and a hollow lead screw (13) is hollow cylindrical revolving meber, on the external cylindrical surface of hollow lead screw (13) Also it is machined with arc helicla flute, the arc helicla flute on hollow lead screw (13) external cylindrical surface and the arc on nut (15) inner cylinder face Shape helicla flute is engaged to form a helical duct, is equipped with multiple spherical balls (14) in the helical duct, hollow lead screw (13), Nut (15) and spherical ball (14) composition ball screw framework, the rear end of a cylindrical pedal push rod (12) is through hollow The hollow bulb of leading screw (13), groove is provided with vertically on hollow lead screw (13) rear end face, one is located at rear end cap (11) hollow bulb Power-assisted push rod (21) front space coordinate be arranged on hollow lead screw (13) rear end face on groove in, before pedal push rod (12) End is fixedly connected with the rear end of a pedal push rod connector (1), and the front end of pedal push rod connector (1) is used to connect vehicle Brake pedal, a PTS includes a PTS main body (31) and one senses with pedal travel The sliding magnet (33) that device main body (31) is slidably matched, PTS main body (31) are fixedly connected with vehicle frame, slide magnetic Iron (33) is fixed between the rear end face of pedal push rod connector (1) and pedal push rod (12) front end face, pedal push rod (12) First return spring (2) is provided between the front end face of front end and drive end bearing bracket (3), one is set with the middle part of power-assisted push rod (21) Individual return block (22), a master cylinder (23) are fixed on rear end cap (11), and the piston push rod (24) of master cylinder (23) stretches into rear end cap (11) hollow bulb of leading portion, piston push rod (24) are fixedly connected with power-assisted push rod (21) rear end, and the front end face of master cylinder (23) is with returning Second return spring (25) is provided between the rear end face of position block (22), master cylinder (23) is fixed on rear end cap (11), main Two inlets of cylinder (23) are connected with a fluid reservoir (26), and a liquid outlet of master cylinder (23) passes through fluid pressure line and one The inlet connection of No.1 two-position two-way solenoid valve (27), another liquid outlet of master cylinder (23) pass through fluid pressure line and one three The inlet connection of connection for bbreather pipe (34), a liquid outlet of tee pipe coupling (34) pass through fluid pressure line and a pressure sensing The inlet connection of device (32), another liquid outlet of tee pipe coupling (34) pass through fluid pressure line and No. two bi-bit bi-pass The inlet connection of magnetic valve (28), the liquid outlet of No.1 two-position two-way solenoid valve (27) pass through fluid pressure line and a hydraulic pressure control The inlet connection of unit (29) processed, the liquid outlet of No. two two-position two-way solenoid valves (28) pass through fluid pressure line and hydraulic pressure control Another inlet connection of unit (29) processed, four liquid outlets of hydraulic control unit (29) pass through brake hydraulic line respectively It is connected with the inlet of four disk brakes (30) on four wheels of vehicle, PTS (31) and pressure The signal output part of force snesor (32) is connected by data wire with the signal input part of the electronic control unit in vehicle respectively, Motor, No.1 two-position two-way solenoid valve (27), No. two two-position two-way solenoid valves (28) and hydraulic control unit (29) respective letter Number receiving terminal passes through the output end of data wire and electronic control unit and connected respectively.

A kind of 2. integrated electric energy assisted braking system according to claim 1, it is characterised in that described sun gear (16) it is hollow step structure, sun gear (16) leading portion is pilot pin section, and back segment is big axle journal section, between leading portion and back segment Escape is left, the pilot pin section of sun gear (16) is provided with the gear teeth, and big axle journal section is centered on the axis of rotation of sun gear (16) Line is uniformly provided with four screwed holes, the front end face of rotor (18) position corresponding with four screwed holes on sun gear (16) Put and be also provided with four screwed holes, the big axle journal section of sun gear (16) is fixed by the front end face of screw and rotor (18) to be connected Connect.

3. a kind of integrated electric energy assisted braking system according to claim 1, it is characterised in that before pedal push rod (12) There is the pedal push rod forward extended out a connecting shaft on end face, external screw thread, pedal push rod connection are provided with pedal push rod connecting shaft Part (1) rear end is provided with internal thread, and pedal push rod (12) is connected by pedal push rod connecting shaft and pedal push rod connector (1) screw thread Connect, for transmitting brake force.

A kind of 4. integrated electric energy assisted braking system according to claim 3, it is characterised in that described power-assisted push rod (21) it is a stepped cylindrical revolving body, the leading portion of power-assisted push rod (21) is big axle journal section, and the big axle journal section is with power-assisted push rod (21) line is provided with a blind cylindrical hole centered on axis of rotation, and the elastic reaction disk (20) of cylinder, bullet are provided with blind hole Property reaction tray (20) height be more than power-assisted push rod (12) blind hole depth, the back segment of power-assisted push rod (21) is pilot pin section, Pilot pin section line centered on the axis of rotation of power-assisted push rod (21) is provided with a screwed hole, is provided with piston push rod (24) outer Screw thread, the pilot pin section of power-assisted push rod (21) are threadedly coupled with piston push rod (24), the intersegmental gap of big axle journal of power-assisted push rod (21) Coordinate in the groove being arranged on pedal push rod (12) rear end face.

A kind of 5. integrated electric energy assisted braking system according to claim 4, it is characterised in that described return block (22) it is a hollow cylindrical stepped revolving meber, the leading portion of return block (22) is big axle journal section, and back segment is pilot pin section, is returned Position block (22) is sleeved on the pilot pin section of power-assisted push rod (21), front end face and the power-assisted push rod of the big axle journal section of return block (22) (21) the rear end face contact of big axle journal section, the second return spring (25) are arranged on the front end face of the output shaft of master cylinder (23) with returning Between the rear end face of the pilot pin section of position block (22).

A kind of 6. integrated electric energy assisted braking system according to claim 1, it is characterised in that described motor stator (19) equally distributed bar-shaped trough is provided with along axis of rotation direction on its external cylindrical surface, determined in electric machine casing (9) with motor Position corresponding to sub (19) is provided with bar shaped pin, and the bar-shaped trough of motor stator (19) and electric machine casing (9) inner stripe pin interference are matched somebody with somebody Close, motor stator (19) is fixed in electric machine casing (9), described rotor 18 is provided with projection at middle part, raised Front side is supported on middle end cap (8) by an angular contact ball bearing (10), and raised rear side passes through another angular contact ball axle Hold (10) to be supported on right end cap (11), interference fits are installed between rotor (18) and angular contact ball bearing (10), corner connection Ball bearing (10) is touched to install with middle end cap (8) and right end cap (11) interference fits.

7. a kind of integrated electric energy assisted braking system according to claim 1, it is characterised in that before pedal push rod (12) There is the projection of annular shape on the external cylindrical surface at end, the first return spring (2) is arranged on the projection and drive end bearing bracket (3) of the annular shape Between front end face.

A kind of 8. integrated electric energy assisted braking system according to claim 1, it is characterised in that the first described return Spring (2) and the second return spring (25) are cone shaped spring.