CN107289043A - A kind of self-locking electro-mechanical brake apparatus - Google Patents

Abstract

The invention provides a self-locking electronic mechanical braking device, which consists of a box body, a first motor, a planetary gear transmission mechanism, a screw shaft, a second motor, a ball screw nut, a spring, a friction plate and a brake disc Composition; the first motor is installed on the box body, the sun gear of the planetary gear transmission mechanism is set on the output shaft of the motor, the ring gear is fixed in the box body, the planet carrier is connected coaxially with the screw shaft, and the middle part of the screw shaft is connected to the second motor The rotor is installed to form a sliding screw pair, the second motor stator is fixedly installed inside the box, the other end of the screw shaft is installed with the ball screw nut to form a rolling screw pair, the ball screw nut passes through the box, and the spring is installed Between the ball screw nut and the box body; two friction plates are respectively installed on the ball screw nut and the partition outside the box body, and the brake disc is installed between the two friction discs. The invention can effectively save the volume occupied by the braking device in the layout of the whole vehicle, and can stably realize the self-locking function.

Description

A self-locking electromechanical brake device

technical field

The invention belongs to the technical field of automobile brake systems. More specifically, the present invention relates to a self-locking electromechanical braking device.

Background technique

Traditional automobile brake systems usually use hydraulic brake devices, which have the disadvantage of requiring a certain number of pipelines and valve components, making the whole device complex in structure and heavy in mass. Due to the long pipeline of the hydraulic brake device, the brake pressure is generated slowly, and it is easy to cause brake lag, which makes the time to eliminate the brake gap longer, resulting in reduced safety; if you want to obtain a faster brake response, hydraulic pressure Braking device just must adopt high-performance hydraulic valve element, promptly increased the cost of braking system itself.

With the overall high-speed development of the current automobile industry, people have put forward higher requirements for the braking performance and cost of automobiles, and the electromechanical braking (EMB) system has gradually entered people's field of vision. Since the electromechanical brake (EMB) system is a mechatronic system, its working process is completely completed by the mechanical structure, so it can obtain a good braking response and avoid the pollution caused by the oil in the hydraulic system pipeline. , in line with the overall needs of the current automotive industry and the industry requirements of new energy vehicles.

The electronic mechanical brake (EMB) system mainly implements current control on the brake motor through the electronic control unit to make the brake motor output torque, and through the mechanical transmission mechanism in the system, the output torque of the brake motor is converted into a function The braking force on the brakes.

Due to the large number of components of the existing electromechanical braking device, the structural optimization is not reasonable enough, resulting in a large volume and low integration of the electromechanical braking device, which is not conducive to the high integration of the emerging automobile industry. Requirements; In addition, the current electromechanical braking devices lack independent self-locking mechanisms, and it is difficult to meet the braking requirements when the car is parked.

Contents of the invention

In view of the above-mentioned defects in the prior art, the present invention provides a self-locking electromechanical brake device, which can effectively save the volume occupied by the brake device in the layout of the vehicle, and can stably realize the self-locking function. In conjunction with the accompanying drawings of the description, the technical solution of the present invention is as follows:

A self-locking electromechanical braking device, which is composed of a box body, a first motor, a planetary gear transmission mechanism, a screw shaft, a second motor, a ball screw nut, a spring, a friction plate and a brake disc;

The first motor 1 is installed on the outer end of the box body, the sun gear of the planetary gear transmission mechanism is arranged on the motor output shaft 2, the ring gear is fixed in the box body, the planet carrier 8 is connected with the screw shaft 19 by coaxial transmission, and the wire The middle part of the screw shaft 19 is coaxially connected with the second motor rotor 18 to form a sliding screw pair, the second motor stator 15 is fixedly installed inside the box, and the other end of the screw shaft 19 is coaxially connected with the ball screw sub-nut 20 to form a rolling screw pair. The screw pair, the rear end of the ball screw auxiliary nut 20 passes through the box body, and the spring 21 is installed between the outer edge end surface of the head end of the ball screw auxiliary nut 20 and the inner wall of the box; two friction plates are respectively installed on The rear end surface of the ball screw auxiliary nut 20 and the partition plate located outside the box, and the brake disc 26 is installed between the two friction discs;

Driven by the first motor 1, the power is transmitted to the screw shaft 19 through the planetary gear transmission mechanism, and the ball screw secondary nut 20 moves outwards under the drive of the screw shaft 19 to realize frictional braking. When the stator of the second motor and After the rotor of the second motor is energized, the rotor of the second motor moves outward along the screw shaft 19 and abuts against the outer end surface of the head end of the secondary ball screw nut 20 on the outside and self-locks to maintain the braking force.

Further, the sun gear of the planetary gear transmission mechanism is a gear shaft processed on the motor output shaft 2, the ring gear of the planetary gear transmission mechanism is a ring of internal teeth processed on the inner wall of the box, and the planetary gear The planetary gear 7 of the transmission mechanism is installed on the planet carrier 8, and is respectively engaged with the inner ring and the sun gear for transmission.

Furthermore, the main body of the planet carrier 8 is a quill structure, and the inner surface of the quill shaft at the rear end of the planet carrier 8 is keyed to the outer surface of the screw shaft 19; the front end of the planet carrier 8 is provided with an outer edge, and There are three cylinders evenly distributed along the circumferential direction of the end surface of the outer edge, the planetary gear 7 is installed on the three cylinders, and a bearing bush 6 is installed between the inner surface of the planetary gear 7 and the outer surface of the cylinder, and the front of the planetary carrier 8 A cover plate 5 is fixedly installed on the side end surface; a deep groove ball bearing 9 is installed between the end of the motor output shaft 2 and the inner side of the sleeve shaft of the planet carrier 8 .

Further, the second motor is composed of a second motor stator 15, a stator winding 16, a second motor rotor 18 and a rotor yoke 17, two groups of second motor stators 15 are fixedly installed on the inner wall of the box, and the stator winding 16 is installed between two sets of second motor stators 15, the second motor rotor 18 is installed in cooperation with the screw shaft 19 to form a sliding screw pair, and the rotor yoke 17 is installed on the outer surface of the second motor rotor 18 , the magnetic field line transmission in the magnetic circuit.

Further, the screw shaft 19 is installed with the second motor rotor 18 to form a trapezoidal sliding screw pair.

Further, two tapered roller bearings are installed in opposite directions between the outer side of the sleeve shaft at the rear end of the planet carrier 8 and the inner wall of the box.

Further, the ball screw sub-nut 20 is cylindrical with an outer edge at the head end and a bottom cover at the rear end, and sliders are uniformly arranged on the outer peripheral side of the ball screw sub-nut 20 , and on the side corresponding to the slider The inner wall of the box is provided with a chute, and the slider is installed in the chute. Under the guidance of the chute, the ball screw auxiliary nut 20 linearly slides along the inner wall of the box.

Further, the box body is composed of a box cover 3, a front box body 4, an intermediate box body 11 and a rear box body 24, the box cover 3 is installed at the front end of the whole box body, and the first motor 1 is fixedly installed on the box body On the cover 3, the box cover 3, the front box body 4, the middle box body 11 and the rear box body 24 are connected by bolts in turn, and a sealing ring 23 is installed at the joint between the rear box body 24 and the secondary nut 20 of the ball screw.

Compared with prior art, the beneficial effect of the present invention is:

1. A self-locking electromechanical brake device according to the present invention integrates the mechanical parts of the brake device itself and the self-locking parts into a brake device, and adopts a planetary gear transmission mechanism, so that the volume of the whole device Small and highly integrated, this highly integrated design can effectively save the volume occupied by the brake device in the layout of the vehicle and facilitate the layout.

2. A self-locking electromechanical braking device according to the present invention realizes self-locking by sliding the screw pair to meet the requirements of the current braking strategy for pressure-holding conditions, and effectively saves the brake device on the entire vehicle. Based on the volume occupied in the layout, the self-locking function can be realized more stably

3. The self-locking electromechanical braking device of the present invention can realize self-locking control of the brake through the coordinated work of the first motor and the second motor when the braking system is working in the parking brake working condition , and its parking performance is better, which can effectively improve safety.

4. A self-locking electromechanical braking device according to the present invention can achieve good braking response through motor control, which can be applied to the current traditional automobile field and emerging electric vehicle field, and its braking is stable Good properties and broad application prospects.

Description of drawings

Fig. 1 is the front sectional view of the self-locking electromechanical braking device of the present invention;

Fig. 2 is a top view of the self-locking electromechanical braking device of the present invention;

Fig. 3 is the sectional view of the A-A direction of the self-locking electromechanical braking device of the present invention;

Fig. 4 is a B-direction view of the self-locking electromechanical braking device of the present invention;

Fig. 5 is a structural schematic diagram of the planetary carrier in the self-locking electromechanical brake device according to the present invention;

Fig. 6 is a schematic structural view of the ball screw auxiliary nut in the self-locking electromechanical brake device according to the present invention.

In the picture:

1. The first motor, 2. The output shaft of the motor, 3. The box cover, 4. The front box,

5. Cover plate, 6. Bearing shell, 7. Planetary gear, 8. Planetary carrier,

9. Deep groove ball bearing, 10. First tapered roller bearing, 11. Intermediate case, 12. Second tapered roller bearing,

13. Flat key, 14. Bushing, 15. Second motor stator, 16. Stator winding,

17. Rotor yoke, 18. Second motor rotor, 19. Screw shaft, 20. Ball screw nut,

21. Spring, 22. Ball screw auxiliary ball, 23. Seal ring, 24. Rear box,

25. The first friction plate, 26. The brake disc, 27. The second friction plate.

detailed description

In order to further clearly illustrate the technical solution of the present invention, in conjunction with the accompanying drawings, the specific implementation of the present invention is as follows:

As shown in Figure 1, the present invention provides a self-locking electromechanical braking device, which mainly consists of a first motor 1, a motor output shaft 2, a case cover 3, a front case body 4, a cover plate 5, a bearing bush 6, a planetary Gear 7, planet carrier 8, deep groove ball bearing 9, first tapered roller bearing 10, intermediate box 11, second tapered roller bearing 12, flat key 13, bushing 14, stator core 15, stator winding 16 , rotor yoke 17, second motor rotor 18, screw shaft 19, ball screw nut 20, spring 21, ball screw ball 22, sealing ring 23, rear box 24, first friction plate 25, system The moving disc 26 and the second friction plate 27 are composed.

The first motor 1 is a DC brushless motor, as shown in Figure 4, the rear end flange of the first motor 1 and the case cover 3 are assembled together by four sets of bolts and nuts to ensure that the two are connected together. Relative position remains unchanged in the work; As shown in Figure 2, described front box body 4 is the sleeve shape that front and rear ends are ring flanges, and the ring flange plate of box cover 3 and front box body 4 front ends passes through Four screw connectors are assembled together to ensure that the relative position of the box cover 3 and the front box body 4 remains unchanged during work; the middle box body 11 has ring flanges on the outer circumference of the front side and the rear end surface The sleeve-shaped structure of the disc, the front end of the middle box 11 is inserted into the rear end sleeve of the front box 4, and the annular flange at the rear end of the front box 4 is connected to the outer circumference of the middle box 11 by six screws. The flanges are connected to ensure that the relative positions of the front box body 4 and the middle box body 11 remain unchanged during work.

A ring of internal teeth is also processed at the middle position of the inner surface of the front box body 4 to form a ring gear structure;

The planetary carrier 8 is located in the front box body 4, as shown in Figure 5, the main body of the planetary carrier 8 is a quill structure, the inner surface of the quill shaft at the rear end of the planetary carrier 8 is processed with a flat keyway, and the planetary carrier The front end of 8 is provided with an outer edge, and three cylinders are evenly distributed in the circumferential direction of the end surface of the front end, and the axis of the cylinder is parallel to the axis of the planet carrier 8, and a threaded blind hole is processed in the center of the outer end surface of each cylinder. A planetary gear 7 is set on each cylinder, and a bearing bush 6 is installed between the inner surface of the planetary gear 7 and the outer surface of the cylinder. The function of the bearing bush 6 is to reduce the wear between the planetary gear 7 and the boss of the planet carrier 8 , improve its service life; the front end of the bearing bush 6 is provided with an outer edge, the outer edge rear end surface of the bearing bush 6 leans against the front end surface of the planetary gear 7, and the rear end surface of the planetary gear 7 leans against the outer edge of the front end of the planet carrier 8 on the rear end face, so as to realize the axial positioning of the planetary gear 7; the cover plate 5 is flat cylindrical, and a central hole is processed at the center of the cover plate 5, and three evenly distributed through holes are processed in the circumferential direction of the cover plate 5. holes, the central positions of the through holes correspond to the centers of the threaded blind holes of the three cylinders on the planet carrier 8 respectively, and the through holes of the cover plate 5 and the threaded blind holes in the center of the planet carrier 8 cylinders are assembled together by three screws to Ensure that the relative positions of the cover plate 5 and the planetary carrier 8 remain unchanged during operation.

The motor output shaft 2 is a three-stage stepped gear shaft. After the front section of the motor output shaft 2 is connected to the first motor 1, it passes through the center hole of the cover plate 5. The middle section of the motor output shaft 2 is processed with gear teeth to form The gear shaft, the rear section of the motor output shaft 2 extends into the front sleeve of the planet carrier 8, and a deep groove ball bearing 9 is installed between the motor output shaft 2 and the planet carrier 8, and the model of the deep groove ball bearing 9 is 6002 Type deep groove ball bearing, the deep groove ball bearing 9 is set on the outer side of the motor output shaft 2, the outer peripheral surface of the deep groove ball bearing 9 is in contact with the inner surface of the sleeve structure of the planet carrier 8, and the deep groove ball bearing 9 The front end of the inner ring is in contact with the shoulder of the motor output shaft 2, and the rear end of the outer ring of the deep groove ball bearing 9 is in contact with the inner end surface of the planet carrier 8 sleeve. The function of the deep groove ball bearing 9 is to ensure the motor output shaft 2. Freely rotates and acts as a support.

As shown in Figure 3, the ring gear on the inner surface of the front box body 4 meshes with the outside of the three planetary gears 7 installed on the planet carrier 8, and the inside of the three planetary gears 7 meshes with the gear shaft in the middle section of the motor output shaft 2, The ring gear on the inner surface of the front box body 4, the planetary carrier 8, the three planetary gears 7 and the gear shaft (i.e. the sun gear) in the middle section of the motor output shaft 2 form a complete planetary gear transmission mechanism, and its function is to connect the first The power output by the motor 1 is input by the gear shaft in the middle section of the output shaft 2 of the motor.

As shown in Figure 1, the screw shaft 19 is a three-stage stepped screw shaft, the optical axis of the front section has the smallest shaft diameter, and the optical axis of the front section of the screw shaft 19 is installed inside the sleeve shaft at the rear end of the planetary carrier 8, so A bushing 14 is installed between the front end surface of the rear side shoulder of the optical axis of the front section of the screw shaft 19 and the rear end surface of the planetary carrier 8, and the bushing 14 is a ring-shaped part, which plays a role in positioning the shoulder. effect;

The sleeve shaft at the rear end of the planet carrier 8 extends to the front end of the middle case 11, and two tapered roller bearings are installed between the planet carrier 8 and the middle case 11, the first tapered roller bearing 10 and the second The tapered roller bearings 12 are all tapered roller bearings of model 7006C, and the assembly direction of the first tapered roller bearing 10 and the second tapered roller bearing 12 is opposite. During assembly, the inner ring of the first tapered roller bearing 10 is installed in contact with the front shoulder of the quill shaft at the rear end of the planet carrier 8, and the outer ring of the second tapered roller bearing 12 is installed in contact with the outer ring of the first tapered roller bearing 10. The rings are installed in contact with each other, and the rear end of the inner ring of the second tapered roller bearing 12 is installed in contact with the front end of the bushing 14 .

A flat keyway is processed on the outer circumference of the optical axis of the front section of the screw shaft 19, and the size of the keyway is equivalent to the size of the flat keyway processed on the inner surface of the sleeve shaft at the rear end of the planet carrier 8. The end sleeve shafts are connected by flat keys 13 to realize the power transmission of the planet carrier 8 to the screw shaft 19 through the flat keys 13; the shaft diameter of the sliding screw shaft in the middle section of the screw shaft 19 is the largest, and the sliding screw shaft The outer surface of the screw shaft 19 is processed with a spiral trapezoidal groove; the shaft diameter of the rear rolling screw shaft of the screw shaft 19 is between the front optical axis and the shaft diameter of the middle sliding screw shaft, and the rear rolling screw shaft The outer surface is processed with a spiral arc groove.

The flange plate at the rear end of the middle box body 11 and the front end flange plate of the rear box body 24 are assembled together through six sets of bolt and nut connectors, so as to ensure that the relative position of the middle box body 11 and the rear box body 24 is maintained during work. constant. The inner surface of the middle of the rear case 24 is processed with four rectangular long grooves in the circumferential direction, and the outer side of the rear end of the rear case 24 is also provided with a partition plate for installing friction plates.

The stator core 15 and the stator winding 16 are installed on the inner wall of the box at the connection between the middle box 11 and the rear box 12, and the stator winding 16 is located between the two sets of stator cores 15 to form the stator part of the second motor. , by energizing the stator winding 16, the stator part of the second motor produces a changing magnetic field to drive the second motor rotor 18 to rotate; the second motor rotor 18 is tubular, and the inner surface of the second motor rotor 18 is processed with a spiral trapezoidal groove, the second motor rotor 18 is located inside the stator part of the second motor, and is installed on the middle section of the screw shaft 9 sliding screw shaft, the size of the spiral trapezoidal groove on the inner surface of the second motor rotor 18 is the same as that of the wire The size of the spiral trapezoidal groove of the sliding screw shaft in the middle section of the lever shaft 9 is matched to form a sliding screw pair structure to ensure that the power of the second motor rotor 18 can be transmitted to the screw shaft 9, and due to the self-locking of the sliding screw pair Function, the screw shaft 9 will lock the axial sliding movement of the rotor 18 of the second motor, so as to realize that the braking device maintains the braking force when parking. The rotor yoke 17 is installed on the outer surface of the rotor 18 of the second motor, and the role of the rotor yoke 17 is to transmit the magnetic field lines in the magnetic circuit. The rotor 18 of the second motor is located inside the stator part of the second motor, and there is a certain gap between it and the stator part of the second motor, so as to ensure the normal rotation of the rotor 18 of the second motor.

As shown in Figure 6, the ball screw sub-nut 20 is cylindrical in shape with an outer edge at one end and a back cover at the other end, and four rectangles are evenly arranged on the outer peripheral side of the ball screw sub-nut 20 . Slider, the four rectangular sliders are slidingly connected with the four rectangular long slots on the middle inner surface of the rear box body 24. Under the guidance of the rectangular long slots in the rear box body 24, the ball screw auxiliary nut 20 moves along the rear The rectangular long groove in the box body 24 slides linearly to realize the smooth sliding of the ball screw auxiliary nut 20 in the rear box body 24;

As shown in FIG. 1 , the ball screw sub-nut 20 is set on the rear rolling screw shaft of the screw shaft 19 , and the outer end surface of the front end of the ball screw sub-nut 20 is in contact with the rear end surface of the second motor rotor 18 ; The inner surface of the ball screw sub-nut 20 is processed with a spiral arc groove, the helical arc groove on the ball screw sub nut 20 and the helical arc groove on the outer peripheral surface of the rolling screw shaft at the back section of the screw shaft 19 The ball screw sub-nut 20 is assembled with the screw shaft 19 to form a spiral raceway, and the ball screw sub-nut 22 is arranged in the spiral raceway, and the ball screw sub-nut 20, The screw shaft 19 and the balls 22 of the ball screw pair form a ball screw pair structure to ensure that the rotational motion of the screw shaft 19 is converted into the linear movement of the ball screw auxiliary nut 20 . The bottom end of the ball screw secondary nut 20 passes through the rear side support wall of the rear box body 24, and a sealing ring is installed between the rear side support wall of the rear box body 24 and the ball screw secondary nut 20 to ensure braking. Sealing in the device box: a spring 21 is installed between the rear end surface of the ball screw auxiliary nut 20 outer edge and the rear side support wall of the rear box body 24 .

As shown in Figure 1, the first friction plate 25 is fixedly connected to the outer end surface of the bottom end of the ball screw auxiliary nut 20, the second friction plate 27 is fixedly connected to the partition plate outside the rear box body 24, and the brake disc 26 is located at Between the first friction plate 25 and the second friction plate 27, when the brake device does not start working, a certain gap is maintained between the brake disc 26 and the first friction plate 25 and the second friction plate 27, so as to ensure that the braking The device does not interfere with the movement of the car when it is not working.

The working principle and working process of the self-locking electromechanical braking device of the present invention are as follows:

1. Working process of service brake:

When the driver steps on the brake pedal during driving, the ECU control unit of the whole vehicle controls the first motor 1 to start rotating forward, and the motor output shaft 2 starts to rotate. 1. The ring gear on the front casing 4 forms a planetary gear mechanism, and because the front casing 4 remains fixed in the braking device, the ring gear on the front casing 4 is also fixed. Due to the effect of the planetary gear mechanism, the power is input from the gear shaft on the output shaft 2 of the motor, decelerated by the planetary gear 7 to increase the torque, and output from the planetary carrier 8, so that the planetary carrier 8 starts to rotate forward, and the planetary carrier 8 is driven by the flat key 13 Lead screw shaft 19 begins to rotate forward.

Now, the second motor stator iron core 15 and the stator winding 16 are all in a power-off state, and the second motor rotor 18 rotates freely on the screw shaft 19 and does not participate in transmission; the screw shaft 19 begins to rotate forward, and the screw shaft 19, The ball screw pair formed by the ball screw sub-nut 20 and the ball 22 of the ball screw sub-nut converts the rotational motion of the screw shaft 9 into the backward (outward) linear movement of the ball screw sub-nut 20, and the ball screw sub-nut 20 pushes the first friction plate 25 to move backward. Since the second friction plate 27 is fixedly connected to the partition plate outside the rear box body 24 and remains fixed, the first friction plate 25 overcomes the gap between it and the brake disc 26, and pushes the brake disc 26 to move backward until the braking The moving disc 26 overcomes the gap between it and the second friction plate 27. At this time, the first friction plate 25 and the second friction plate 27 are in contact with the brake disc 26, and the brake disc 26 starts to brake through friction. Decelerate to realize the braking process under driving conditions.

2. Working process of parking brake:

When the driver needs parking brake, the ECU control unit of the whole vehicle controls the first motor 1 to start to rotate forward, and the motor output shaft 2 starts to rotate. The ring gear on the casing 4 forms a planetary gear mechanism, and because the front casing 4 remains fixed in the braking device, the ring gear on the front casing 4 is also fixed. Due to the effect of the planetary gear mechanism, the power is input from the gear shaft on the output shaft 2 of the motor, decelerated by the planetary gear 7 to increase the torque, and output from the planetary carrier 8, so that the planetary carrier 8 starts to rotate forward, and the planetary carrier 8 is driven by the flat key 13 Lead screw shaft 19 begins to rotate forward.

Now, the second motor stator iron core 15 and the stator winding 16 are all in a power-off state, and the second motor rotor 18 rotates freely on the screw shaft 19 and does not participate in transmission; the screw shaft 19 begins to rotate forward, and the screw shaft 19, The ball screw pair formed by the ball screw sub-nut 20 and the ball 22 of the ball screw sub-nut converts the rotational motion of the screw shaft 9 into the backward (outward) linear movement of the ball screw sub-nut 20, and the ball screw sub-nut 20 pushes the first friction plate 25 to move backward. Since the second friction plate 27 is fixedly connected to the partition plate outside the rear box body 24 and remains fixed, the first friction plate 25 overcomes the gap between it and the brake disc 26, and pushes the brake disc 26 to move backward until the braking The moving disc 26 overcomes the gap between it and the second friction plate 27. At this time, the first friction plate 25 and the second friction plate 27 are in contact with the brake disc 26, and the brake disc 26 starts to brake through friction. Decelerate to realize the braking process under driving conditions.

When the braking force acting on the brake disc 26 reaches the parking brake requirement, the vehicle ECU controls the first motor 1 to be energized but stops rotating to keep the position unchanged, and the second motor stator core 15 and stator winding 16 are both energized , because the second motor stator core 15 and the stator winding 16 form the second motor stator part, the second motor stator part produces a changing magnetic field under the action of the current, and the magnetic field makes the second motor rotor 18 rotate forward, because the second motor The rotor 18 and the screw shaft 9 form a sliding screw pair, and the second motor rotor 18 produces an axial displacement backward relative to the screw shaft 9 until the rear end surface of the second motor rotor 18 bears against the front end surface of the ball screw sub-nut 20 , at this time, the ECU of the whole vehicle controls the power-off of the stator part of the second motor, so that the second motor stops working. After the second motor stops working, the ECU of the whole vehicle controls the power-off of the first motor 1 to stop working. At this time, due to the self-locking effect of the sliding screw pair composed of the second motor rotor 18 and the screw shaft 9, the screw shaft 9 will lock the axial slip of the second motor rotor 18, thereby realizing the parking of the braking device. When the braking force is maintained, it realizes the braking stability during parking braking.

Claims (8)

1. a kind of self-locking electro-mechanical brake apparatus, it is characterised in that：

By casing, the first motor, planetary gear mechanism, lead screw shaft, the second motor, rolling ball screw pair screw nut, spring, friction Piece and brake disc composition；

First motor (1) is arranged on the outer end of casing, and the sun gear of planetary gear mechanism is arranged on motor output shaft (2) On, gear ring is fixed in casing, and planet carrier (8) is connected with lead screw shaft (19) one end coaxial transmission, with the in the middle part of lead screw shaft (19) Two rotors (18) are coaxially connected to form lead screw pair, and the second motor stator (15) is fixedly mounted on box inside, leading screw The other end of axle (19) and the coaxially connected formation ball-screw pair of rolling ball screw pair screw nut (20), the rolling ball screw pair screw nut (20) rear end passes through casing, spring (21) be arranged on rolling ball screw pair screw nut (20) head end outer end face and cabinet wall it Between；Two friction plates are separately mounted on the rear end face of rolling ball screw pair screw nut (20) and on the dividing plate on the outside of casing, system Moving plate (26) is arranged between two frictional disks；

Under the driving of the first motor (1), power is transferred to lead screw shaft (19), ball screw assembly, spiral shell through planetary gear mechanism Female (20) are moved out under the drive of lead screw shaft (19) realizes friction catch, when the second motor stator and the second rotor are logical After electricity, the second rotor is displaced outwardly and acted against the head end of the rolling ball screw pair screw nut (20) in outside along lead screw shaft (19) Simultaneously the holding of brake force is realized in self-locking on the end face of outer.

2. a kind of self-locking electro-mechanical brake apparatus as claimed in claim 1, it is characterised in that：

The sun gear of the planetary gear mechanism is the gear shaft processed on motor output shaft (2), the planetary gear The gear ring of transmission mechanism is the circle internal tooth processed on box inside wall, the planetary gear (7) of the planetary gear mechanism Install on planet carrier (8), and respectively with inner ring and sun gear engaged transmission.

3. a kind of self-locking electro-mechanical brake apparatus as claimed in claim 2, it is characterised in that：

The main body of the planet carrier (8) is sleeve axle construction, inner surface and the lead screw shaft (19) of planet carrier (8) rear end quill Outer surface key connection；Planet carrier (8) front end is provided with outer, and the outer end face circumferencial direction in front end is evenly distributed with three circles Post, planetary gear (7) correspondence is arranged on three cylinders, and the inner surface in planetary gear (7) and the outer surface of cylinder Between be respectively mounted in a bearing shell (6), planet carrier (8) anterior end surface and be installed with cover plate (5)；Motor output shaft (2) end Deep groove ball bearing (9) is installed between the quill inner side of planet carrier (8).

4. a kind of self-locking electro-mechanical brake apparatus as claimed in claim 1, it is characterised in that：

Second motor is by the second motor stator (15), stator winding (16), the second rotor (18) and rotor rim (17) constitute, the second motor stator (15) is fixedly mounted on cabinet wall described in two groups, stator winding (16) is arranged on two groups Between second motor stator (15), second rotor (18) coordinates installation to form lead screw pair with lead screw shaft (19), The rotor rim (17) is arranged on the outer surface of the second rotor (18), and magnetic line of force transmission is carried out in magnetic circuit.

5. a kind of self-locking electro-mechanical brake apparatus as described in claim 1 or 4, it is characterised in that：

The lead screw shaft (19) installs the trapezoidal lead screw pair of composition with the second rotor (18).

6. a kind of self-locking electro-mechanical brake apparatus as claimed in claim 1, it is characterised in that：

Along being reversely provided with two taper roll bearings between cabinet wall on the outside of planet carrier (8) rear end quill.

7. a kind of self-locking electro-mechanical brake apparatus as claimed in claim 1, it is characterised in that：

The rolling ball screw pair screw nut (20) is tubular of the head end provided with outer and rear end back cover, in rolling ball screw pair screw nut (20) Outer circumference side on be uniformly provided with sliding block, be provided with chute in cabinet wall corresponding with sliding block, sliding block is arranged in chute, Under the guide effect of chute, rolling ball screw pair screw nut (20) linearly slides along cabinet wall.

8. a kind of self-locking electro-mechanical brake apparatus as described in claim 1,2,4,6 or 7, it is characterised in that：

The casing is made up of case lid (3), preceding casing (4), middle housing (11) and rear box (24), and the case lid (3) is installed In whole casing front end, the first motor (1) is fixedly mounted on the case lid (3), the case lid (3), preceding casing (4), centre Casing (11) and rear box (24) bolt connection successively, pacify in rear box (24) and rolling ball screw pair screw nut (20) rear end junction Equipped with sealing ring (23).