CN216185077U - Electronic mechanical brake device capable of realizing self-locking - Google Patents

Abstract

The utility model provides an electronic mechanical brake device capable of realizing self-locking, which solves the problems that the existing electronic mechanical brake has more complex structure and lower sealing property; and the locking is realized through the clutch, so that the problem of larger volume is solved. The device comprises a driving motor, a fixed sleeve, a planetary roller mechanism, a front shell, an output shaft and a damping reduction mechanism, wherein the front shell is connected with the front end of the fixed sleeve to form a sealed cavity, and the sealed cavity is filled with lubricating oil; the planetary roller mechanism comprises an input shaft, a roller frame and a plurality of planetary rollers; the input shaft is arranged in the sealing cavity, the rear end of the input shaft extends out of the sealing cavity to be connected with the driving motor, and the front end of the input shaft is provided with external threads; the roller frame is arranged between the fixed sleeve and the input shaft, and the inner wall of the roller frame is fixedly connected with two positioning rings; the plurality of planetary rollers are connected to the two positioning rings; the rear end of the output shaft is fixedly connected with the roller frame, the front end of the output shaft extends out of the sealing cavity, and the output shaft and the input shaft are eccentrically arranged; the damping reducing mechanism is used for reducing the resistance of the lubricating oil or lubricating grease or gas flowing back and forth in the sealing cavity.

Description

Electronic mechanical brake device capable of realizing self-locking

Technical Field

The utility model relates to the technology of an electromechanical brake, in particular to an electromechanical brake device capable of realizing self-locking, which is suitable for braking various vehicles and aircrafts, especially railway vehicles.

Background

With the rapid development of automobile technology, the traffic flow density is continuously increased and the speed is gradually increased, so that the requirements on the safety and the reliability of the automobile are higher and higher, and whether an automobile brake system can quickly and effectively realize the brake intention of a driver in real time becomes a key problem influencing the road traffic safety.

Because the traditional hydraulic braking system is complex, the braking force needs to pass through a vacuum booster, a hydraulic pipeline and the like, the reaction speed is low, the volume is large, the arrangement and assembly difficulty on the whole vehicle is large, an electric control system is complex, the manufacturing and maintenance cost is high, and the like. The electronic mechanical brake system (EMB) not only overcomes the inherent defects of the hydraulic brake system, but also has the outstanding advantages of simple system, high brake response speed, high efficiency and the like, and has the trend of replacing the traditional hydraulic brake system at present.

At present, an EMB electromechanical brake outputs braking power through a driving mechanism to drive a motion conversion mechanism to rotate, and the motion conversion mechanism pushes a braking force output element to do non-rotation axial translation motion, so that vehicle service braking is realized. In order to realize the translation of the braking force output element, the motion conversion mechanism and the braking force output element are respectively provided with an axial concave/convex groove and a guide component which are matched with each other, so that the structure is more complex, and the sealing property is reduced due to the arrangement of the axial concave/convex groove, so that the working process of the EMB electromechanical brake is influenced; in addition, the front cavity and the rear cavity on the two sides of the motion conversion mechanism are respectively independent, the front cavity and the rear cavity of the motion conversion mechanism form a closed containing cavity in the rotation process, and the air pressure of the front cavity and the air pressure of the rear cavity are changed to prevent the axial motion of the motion conversion mechanism, so that the braking process is influenced.

More importantly, the existing electromechanical brake usually adopts a clutch to realize locking, so that the size of the brake is large.

SUMMERY OF THE UTILITY MODEL

The problem that the conventional electromechanical brake is complex in structure, the sealing performance is reduced due to the arrangement of axial concave/convex grooves, and the normal motion of a motion conversion mechanism is influenced due to the change of air pressure of front and rear cavities is solved; the utility model also provides an electronic mechanical brake device capable of realizing self-locking.

In order to achieve the purpose, the technical scheme provided by the utility model is as follows:

an electronic mechanical brake device capable of realizing self-locking is characterized in that:

the device comprises a driving motor, a fixed sleeve, a planetary roller mechanism, a front shell, an output shaft and a damping reduction mechanism;

the front shell is connected with the front end of the fixed sleeve to form a sealed cavity; the sealing cavity part is filled with lubricating oil or lubricating grease;

the planetary roller mechanism comprises an input shaft, a roller frame and N planetary rollers, wherein N is an integer greater than 2;

the input shaft is arranged in the sealing cavity and is coaxial with the fixed sleeve, the rear end of the input shaft extends out of the sealing cavity, and the front end of the input shaft is provided with an external thread or an annular groove;

the roller frame is coaxial with the fixed sleeve and is arranged between the fixed sleeve and the external thread or the annular groove of the input shaft, and the inner wall of the roller frame is fixedly connected with two positioning rings which are arranged at intervals along the axial direction of the roller frame;

the N planetary rollers are arranged on the two positioning rings and are arranged along the circumferential direction of the positioning rings; the middle part of each planetary roller is matched with the external thread or the annular groove of the input shaft, and the two end parts are matched with the roller frame;

the output shaft is arranged in the sealing cavity, the rear end part of the output shaft is fixedly connected with the front end part of the roller frame, and the front end of the output shaft extends out of the sealing cavity;

the axes of the output shaft and the input shaft are eccentrically arranged, and/or the roller frame and the fixed sleeve are matched by adopting an anti-rotation key groove or a non-circular section, so that the non-rotation axis of the output shaft moves forwards and backwards;

the driving motor is connected with the rear end of the input shaft and used for driving the input shaft to rotate and driving the N planetary rollers to rotate, and the planetary rollers drive the roller frame and the output shaft to move back and forth along the axial direction of the input shaft;

the damping reducing mechanism is used for reducing the resistance of the lubricating oil or lubricating grease or gas flowing back and forth in the sealing cavity.

Further, the damping reducing mechanism adopts at least one of the following three structures:

(1) at least 1 through groove is formed in the outer side face of the roller frame or the inner side face of the fixed sleeve, and the through groove is a spiral groove or an axial straight groove;

(2) the output shaft is provided with a first air hole, a second air hole and a connecting hole, wherein the first air hole is formed in the output shaft along the radial direction, the second air hole is formed in the input shaft along the radial direction, and the connecting hole is formed in the input shaft along the axial direction and is communicated with the first air hole and the second air hole;

(3) the first air hole is arranged on the output shaft along the radial direction.

Further, the first air hole is positioned at the rear end of the output shaft;

the second air hole is positioned at the rear end of the external thread or the annular groove of the input shaft.

Furthermore, the connecting hole is a central blind hole;

or the connecting hole is a central through hole, and the rear end of the central through hole is provided with a plug.

Further, the driving motor is a single motor or double motors;

the double motors comprise double stators and single rotors matched with the double stators;

or the double motors comprise double stators and double rotors matched with the double stators respectively.

Furthermore, a rotor of the driving motor is of a hollow structure, and the rotor is connected with the rear end of the input shaft through a hollow rotor shaft sleeved on the fixing sleeve;

a gap is arranged between the fixed sleeve and the hollow rotor shaft.

Furthermore, the external thread at the front end of the input shaft is a first external thread, the middle part of the planetary roller is provided with a first external annular groove or a second external thread matched with the first external thread, the two end parts of the planetary roller are provided with second external annular grooves, and the inner surface of the roller frame is provided with an inner annular groove matched with the second external annular groove;

or the annular groove at the front end of the input shaft is a first annular groove, the middle part of the planetary roller is provided with external threads matched with the first annular groove, the two end parts of the planetary roller are provided with second outer annular grooves, and the inner surface of the roller frame is provided with an inner annular groove matched with the second outer annular groove.

Furthermore, a braking force transmission shaft is arranged at the front end of the output shaft, and the braking force transmission shaft is eccentrically arranged with the axis of the output shaft and is coaxial with the axis of the input shaft;

n is 6, 6 planetary rollers are evenly distributed along the circumference of the positioning ring.

Further, a dynamic sealing structure is arranged between the output shaft and the front shell; the dynamic sealing structure comprises a sliding sleeve and a sealing ring, the sliding sleeve is arranged between the front shell and the output shaft, and the sealing ring is arranged between the sliding sleeve and the output shaft and between the sliding sleeve and the front shell.

Furthermore, the front shell is provided with an exhaust hole communicated with the sealing cavity.

Compared with the prior art, the utility model has the advantages that:

1. the braking device adopts the planetary roller mechanism, can realize the output of larger braking force by a smaller structure, and ensures the high-efficiency braking force output; when the input shaft is driven to rotate by the driving motor, the planetary roller is meshed with the input shaft and the roller frame at the same time, the input shaft can drive the roller frame to rotate, but the roller frame is coaxially and fixedly connected with the output shaft, the output shaft and the input shaft are eccentrically arranged, and the roller frame can be limited to rotate by matching the roller frame and the fixed sleeve through an anti-rotation key groove or a non-circular cross section, so that the roller frame cannot rotate, the roller frame and the output shaft are pushed to do non-rotation front-back translation motion along the axis direction of the output shaft, and the vehicle driving braking is realized; the two ends of the roller frame are fixedly connected with positioning rings for mounting the planetary rollers, so that the planetary rollers, the roller frame and the output shaft form an integrated structure, the planetary rollers can only rotate but cannot revolve, the threaded self-locking of the input shaft is realized, the parking braking function is achieved, the service braking function and the parking braking function are integrated, the existing clutch is cancelled to realize locking, the manufacturing cost of the brake is reduced, and the size is reduced; and the fixed sleeve is connected with the front shell in a sealing way, so that oil lubrication sealing can be realized, and water or impurities can be prevented from entering the sealing cavity to influence the force transmission effect.

2. The roller frame and the fixed sleeve are in precise sliding fit, the gap is small, closed containing cavities (a front containing cavity and a rear containing cavity) are formed in the front cavity and the rear cavity when the roller frame moves axially, and the normal axial movement of the roller frame is prevented; meanwhile, the damping reducing mechanism can enable lubricating oil or lubricating grease to flow in the fixed sleeve along with the movement of the planetary roller mechanism so as to lubricate moving parts such as the input shaft, the planetary rollers, the roller frame, the output shaft and the like, and can enable the moving heat to be uniform and released by the shell.

3. The driving motor can be a single motor or double motors; the double motors can adopt a coaxial double-stator single-rotor or double-stator double-rotor structure, so that the redundancy of design is realized, and the reliability of the whole device is improved.

4. The utility model can also design the air vent on the front shell, change the air pressure of the front and back cavities, further improve the roll stand motion stability.

5. The rotor of the driving motor is designed to be a hollow structure, the driving motor is sleeved on the fixing sleeve, the space is fully utilized, the size of the electric electronic mechanical braking device is reduced, and miniaturization is achieved.

6. The planetary roller mechanism is used as the braking force transmission mechanism, the planetary roller adopts a ring groove structure, and the actual lead is increased, namely the equivalent lead is larger than the lead of the input shaft, so that the movement speed of the output shaft is accelerated, and the braking force is more favorably output; and can realize outputting larger braking force with a smaller structure, not only the installation is convenient, but also the high-efficiency braking force output can be ensured.

7. The electric brake device has the characteristics of compact structure, large output brake force, convenience in installation and high reliability.

8. According to the utility model, the dynamic sealing structure is adopted for sealing between the output shaft and the front shell, so that the sealing property of the sealing cavity is ensured, and the phenomenon that lubricating oil or lubricating grease in the sealing cavity is exposed and external impurities enter the sealing cavity to influence the normal work of the device is avoided.

Drawings

FIG. 1 is a first structural schematic view (output shaft does not extend out of front housing) of a first embodiment of the self-locking electromechanical brake device of the present invention;

FIG. 2 is a schematic structural diagram of a first embodiment of the self-locking electromechanical brake device of the present invention (the front end of the output shaft extends out of the front housing);

FIG. 3 is an enlarged view of a portion of FIG. 1 at I;

FIG. 4 is a schematic structural diagram of a planetary roller mechanism (not shown) in an embodiment of the self-locking electromechanical brake device of the present invention;

FIG. 5 is a schematic structural diagram of a second damping reducing mechanism in the first embodiment of the self-locking electromechanical brake device according to the present invention;

FIG. 6 is an enlarged view of a portion of FIG. 1 at II;

FIG. 7 is a schematic structural diagram of a driving motor in a second embodiment of the self-locking electromechanical brake device according to the present invention;

FIG. 8 is a schematic structural diagram of a fourth embodiment of the self-locking electromechanical brake device according to the present invention;

wherein the reference numbers are as follows:

1-fixed sleeve, 2-input shaft, 3-conical bearing, 4-planetary roller, 5-positioning ring, 6-roller frame, 7-output shaft, 8-front housing, 9-driving motor, 10-first screw, 11-hollow rotor shaft, 12-braking force transmission shaft, 13-rotary lip seal ring, 14-deep groove ball bearing, 17-sliding sleeve, 18-sensor connecting shaft, 19-stator, 20-rotor, 21-stud, 22-O-shaped ring, 23-seal ring, 24-round nut, 25-round nut locking washer, 27-shell, 28-rear chamber, 29-front chamber, 30-first air hole, 31-second air hole, 32-connecting hole and 33-exhaust hole.

Detailed Description

The utility model is described in further detail below with reference to the figures and specific embodiments.

Example one

As shown in fig. 1 and 2, the electromechanical brake device capable of realizing self-locking of the present invention includes a driving motor 9, a fixed sleeve 1, a planetary roller mechanism, a front housing 8, an output shaft 7 and a damping reducing mechanism.

The front shell 8 is connected with the front end of the fixed sleeve 1 to form a sealed cavity, and an O-shaped ring 22 is arranged at the joint of the front shell 8 and the fixed sleeve 1; the sealing cavity part is filled with lubricating oil or lubricating grease.

As shown in fig. 3 and 4, the planetary roller mechanism includes an input shaft 2, a roller frame 6, and N planetary rollers 4, where N is an integer greater than 2, and N is 6 in this embodiment; the input shaft 2 is arranged in the sealing cavity and is coaxial with the fixed sleeve 1, a conical bearing 3 is arranged between the output shaft 7 and the inner side wall of the fixed sleeve 1, the conical bearing 3 is positioned at the rear end of the sealing cavity, a rotary lip-shaped sealing ring 13 is also arranged on the input shaft 2, and the rotary lip-shaped sealing ring 13 is positioned between the rear end surface of the conical bearing 3 and the rear end surface of the fixed sleeve 1; the rear end of the input shaft 2 extends out of the sealing cavity and is connected with the output of the driving motor 9, and the front end of the input shaft 2 is provided with a first external thread; the roller frame 6 is coaxially arranged between the fixed sleeve 1 and the first external thread of the input shaft 2, and the inner wall of the roller frame 6 is fixedly connected with two positioning rings 5 which are arranged at intervals; the 6 planetary rollers 4 are movably connected to the two positioning rings 5 and are arranged along the circumferential directions of the positioning rings 5, so that the planetary rollers 4, the roller frame 6 and the output shaft 7 form an integrated structure, the planetary rollers 4 can only rotate and cannot revolve, the thread self-locking of the input shaft 2 is realized, and preferably, the 6 planetary rollers 4 are uniformly distributed along the circumferences of the positioning rings 5; the middle part of each planetary roller 4 is provided with a first outer annular groove or a second outer thread matched with the first outer thread of the input shaft 2, and the inner surface of the roller frame 6 is provided with an inner annular groove matched with the second outer annular grooves at the two end parts of the planetary rollers 4; when the middle part of the planetary roller 4 is designed into a first outer annular groove, 6 planetary rollers 4 are uniformly distributed on the circumference, the difference between the adjacent planetary rollers 4 along the axial direction of the input shaft 2 is 1/N of the first external thread pitch of the input shaft 2, N is the number of the planetary rollers, the embodiment is 1/6, and the 6 planetary rollers are meshed with the first external thread of the spiral lead angle of the outer wall of the input shaft 2 in the axial direction, so that the actual lead is increased, namely the equivalent lead is greater than the lead of the input shaft, the movement speed of the output shaft is accelerated, and the output of braking force is facilitated; and a large braking force can be output with a small structure.

The output shaft 7 is arranged in the sealed cavity, the rear end part of the output shaft is fixedly connected with the front end part of the roller frame 6 through a first screw 10, and the first screw 10 is an M3 screw; the front end of the output shaft 7 extends out of the sealing cavity, the output shaft 7 and the axis of the input shaft 2 are eccentrically arranged, and as shown in fig. 6, the eccentric distance d can be designed to be 1 mm-3 mm.

In order to ensure the sealing performance of the sealing cavity, a dynamic sealing structure is arranged between the output shaft 7 and the front shell 8; the dynamic sealing structure comprises a sliding sleeve 17 and a sealing ring 23, the sliding sleeve 17 is arranged between the front shell body 8 and the output shaft 7, the sealing ring 23 is arranged between the sliding sleeve 17 and the output shaft 7 and between the sliding sleeve 17 and the front shell body 8, and the influence on the normal work of the device caused by the fact that external impurities (water, dust and the like) enter a sealing cavity is avoided. In addition, a stud 21 is provided on the front end surface of the front housing 8 to facilitate assembly with other devices.

Driving motor 9 is used for driving input shaft 2 and rotates, and then drives the 4 rotations of a N planet roller, 6 rotation driving roll frame 6 of a 6 planet roller 4 rotate, but roll frame 6 links firmly with output shaft 7 is coaxial, output shaft 7 is eccentric settings with input shaft 2, roll frame 6 is eccentric settings with input shaft 2 promptly, can make roll frame 6 unable rotate, and promote roll frame 6 and output shaft 7 along the non-rotatory back and forth translation motion of output shaft 7 axis direction, realize vehicle service braking. The translation movement of the roller frame 6 back and forth causes the sealed chamber to be divided into a front volume 29 at the front side of the roller frame 6 and a rear volume 28 at the rear side of the roller frame 6.

The damping reducing mechanism is used for reducing the resistance of lubricating oil or lubricating grease or gas flowing back and forth in the sealed cavity (the front cavity 29 and the rear cavity 28), so that the movement of the roller frame 6 is more stable, and the noise in the movement process is reduced; meanwhile, the damping reducing mechanism can enable lubricating oil or lubricating grease to flow in the fixed sleeve 1 along with the movement of the planetary roller mechanism so as to lubricate moving parts such as the input shaft 2, the planetary rollers 4, the roller frame 6, the output shaft 7 and the like, and can enable the moving heat to be uniform and to be released by the shell;

the damping reducing mechanism of the embodiment can adopt at least one of the following three structures:

firstly, the damping reducing mechanism is at least 1 through groove arranged on the outer side surface of the roller frame 6 or the inner side surface of the fixed sleeve 1, the through groove is a spiral groove or an axial straight groove, and preferably, the number of the through grooves is at least 3, and the through grooves are uniformly distributed on the circumference;

secondly, as shown in fig. 5, the damping reducing mechanism includes a first air hole 30 radially opened on the output shaft 7, a second air hole 31 radially opened on the input shaft 2, and a connecting hole 32 axially opened on the input shaft 2 and communicating the first air hole 30 and the second air hole 31; preferably, the first air hole 30 is located at the rear end of the output shaft 7; the second air hole 31 is positioned at the rear end of the first external thread of the input shaft 2; the connection hole 32 of the present embodiment is designed as a center blind hole; in other embodiments, the connection hole 32 may also be a central through hole, and when the connection hole 32 is designed as a central through hole, a plug needs to be arranged at the rear end of the central through hole; during the translational motion of the output shaft 7, the first air hole 30 is always positioned in the sealed cavity;

thirdly, the damping reducing mechanism is a first air hole 30 which is arranged on the output shaft 7 along the radial direction, and the first air hole 30 is always positioned in the sealing cavity in the translational motion process of the output shaft 7.

The front end of the output shaft 7 is provided with a braking force transmission shaft 12, and the braking force transmission shaft 12 is arranged eccentrically to the axis of the output shaft 7 and is coaxial with the axis of the input shaft 2.

The braking device of the present embodiment further includes a housing 27 disposed outside the driving motor 9 and the fixing sleeve 1, and a front end of the housing 27 is connected to the front housing 8.

In this embodiment, the driving motor 9 is a single motor, as shown in fig. 1, the stator 19 of the driving motor 9 is disposed on the front housing 8, in other embodiments, the stator 19 of the driving motor 9 may also be disposed on the housing 27, the rotor 20 of the driving motor 9 is a hollow structure, the rotor 20 is connected with the rear end of the input shaft 2 through the hollow rotor shaft 11 sleeved on the fixing sleeve 1, the hollow rotor shaft 11 is connected with the rear end of the input shaft 2 by a spline, and the rear end of the input shaft 2 extends out of the hollow rotor shaft 11, and is sleeved with a locking washer 25 for a round nut and a round nut 24 from front to back; a gap is provided between the fixing sleeve 1 and the hollow rotor shaft 11, and the hollow rotor shaft 11 is directly or indirectly fixed to the housing 27 by means of the deep groove ball bearing 14.

Arresting gear is still including setting up the control unit at shell 27 rear portion, control unit includes induction magnet and circuit board, the rear end tip of input shaft 2 is equipped with sensor connecting axle 18, be used for setting up induction magnet, the circuit board sets up on shell 27 and is located induction magnet 'S rear side, be equipped with the magnetism sensing element with induction magnet relative position on the circuit board, the distinguishable induction magnet of magnetism sensing element is at the power of the radial N/S level magnetic field of motion in-process, the circuit board is used for the analysis to calculate output shaft 7 translational motion' S stroke and carries out real time control.

The braking action process of the braking device of the embodiment is as follows:

during the driving process, when the driver steps on the brake pedal, driving motor 9 starts, rotor 20 drives input shaft 2 rotary motion through hollow rotor shaft 11, thereby input shaft 2 rotary motion drives a plurality of planet rollers 4 and carries out the rotation, because the roller frame 6 with a plurality of planet rollers 4 complex is connected with output shaft 7, and output shaft 7 sets up to the disalignment with the central axis of input shaft 2, then a plurality of planet rollers 4 rotate, promote roller frame 6 and output shaft 7 along the axis direction of output shaft 7 preceding translation motion, the braking force transmission shaft 12 and the vehicle braking piece fixed connection of output shaft 7 front end, thereby realize vehicle service braking.

Example two

The difference from the first embodiment is that: the driving motor 9 is a dual motor, and as shown in fig. 7, the dual motor of the present embodiment employs coaxial dual stators and single rotors, thereby achieving redundancy of design and improving reliability of the entire device. In other embodiments, the dual motor may also adopt a coaxial dual-stator and dual-rotor structure.

EXAMPLE III

The difference from the first embodiment and the second embodiment is that: a plurality of first ring channels of equidistant are seted up to input shaft 2 front end, and the middle part of planet roller 4 is equipped with the external screw thread with first ring channel complex.

Example four

The difference from the first embodiment is that: as shown in figure 8, the front shell 8 is provided with an exhaust hole 33 communicated with the sealed cavity, so that the air pressure of the front cavity and the air pressure of the rear cavity are changed, and the movement stability of the roller frame 6 is further improved.

EXAMPLE five

The difference from the first embodiment is that: in order to realize miniaturization, the radial section of the roller frame 6 is non-circular, preferably, the radial section of the roller frame 6 is polygonal, the central hole of the fixed sleeve 1 is polygonal matched with the roller frame 6, and the non-rotary axial forward and backward movement of the output shaft 7 is realized. In other embodiments, at least one anti-rotation guide key may be provided on the roller frame 6, and the fixing sleeve 1 is provided with a guide groove matched with the guide key, or the roller frame 6 and the fixing sleeve 1 are in spline fit, so that the roller frame can only move linearly along the axis and cannot rotate; in order to achieve a better anti-rotation effect of the output shaft 7, the output shaft 7 and the input shaft 2 can be designed to be eccentrically arranged, and meanwhile, the roller frame 6 and the fixing sleeve 1 are matched through anti-rotation key grooves or non-circular cross sections.

The above description is only for the preferred embodiment of the present invention and does not limit the technical solution of the present invention, and any modifications made by those skilled in the art based on the main technical idea of the present invention belong to the technical scope of the present invention.

Claims (10)

1. An electronic mechanical brake device capable of realizing self-locking is characterized in that:

comprises a driving motor (9), a fixed sleeve (1), a planetary roller mechanism, a front shell (8), an output shaft (7) and a damping reducing mechanism;

the front shell (8) is connected with the front end of the fixed sleeve (1) to form a sealed cavity; the sealed cavity is filled with lubricating oil or lubricating grease;

the planetary roller mechanism comprises an input shaft (2), a roller frame (6) and N planetary rollers (4), wherein N is an integer larger than 2;

the input shaft (2) is arranged in the sealing cavity and is coaxial with the fixed sleeve (1), the rear end of the input shaft extends out of the sealing cavity, and the front end of the input shaft is provided with an external thread or an annular groove;

the roller frame (6) is coaxial with the fixed sleeve (1) and is arranged between the fixed sleeve (1) and the external thread or the annular groove of the input shaft (2), and the inner wall of the roller frame (6) is fixedly connected with two positioning rings (5) which are arranged at intervals;

the N planetary rollers (4) are arranged on the two positioning rings (5) and are circumferentially arranged along the positioning rings (5); the middle part of each planetary roller (4) is matched with the external thread or the annular groove of the input shaft (2), and the two end parts are matched with the roller frame (6);

the output shaft (7) is arranged in the sealed cavity, the rear end part of the output shaft is fixedly connected with the front end part of the roller frame (6), and the front end of the output shaft extends out of the sealed cavity;

the output shaft (7) and the input shaft (2) are eccentrically arranged, and/or the roller frame (6) and the fixed sleeve (1) are matched by adopting an anti-rotation key groove or a non-circular section, so that the output shaft (7) can move forwards and backwards in a non-rotating axial direction;

the driving motor (9) is connected with the rear end of the input shaft (2) and is used for driving the input shaft (2) to rotate and driving the N planetary rollers (4) to rotate, and the planetary rollers (4) drive the roller frame (6) and the output shaft (7) to move back and forth along the axial direction of the input shaft (2);

the damping reducing mechanism is used for reducing the resistance of the lubricating oil or lubricating grease or gas flowing back and forth in the sealing cavity.

2. The self-locking electromechanical brake device according to claim 1, wherein the damping-reducing mechanism adopts at least one of the following three structures:

(1) at least 1 through groove which is arranged on the outer side surface of the roller frame (6) or the inner side surface of the fixed sleeve (1) and is a spiral groove or an axial straight groove;

(2) the output shaft is provided with a first air hole (30) which is arranged on the output shaft (7) along the radial direction, a second air hole (31) which is arranged on the input shaft (2) along the radial direction, and a connecting hole (32) which is arranged on the input shaft (2) along the axial direction and is communicated with the first air hole (30) and the second air hole (31);

(3) and a first air hole (30) radially opened in the output shaft (7).

3. The self-locking electromechanical brake device according to claim 2, wherein: the first air hole (30) is positioned at the rear end of the output shaft (7);

the second air hole (31) is positioned at the rear end of the external thread or the annular groove of the input shaft (2).

4. The self-locking electromechanical brake device according to claim 2, wherein: the connecting hole (32) is a central blind hole;

or the connecting hole (32) is a central through hole, and the rear end of the central through hole is provided with a plug.

5. The self-locking electromechanical brake device according to any one of claims 1 to 4, wherein: the driving motor (9) is a single motor or double motors;

the double motors comprise double stators and single rotors matched with the double stators; or the double motors comprise double stators and double rotors matched with the double stators respectively.

6. The self-locking electromechanical brake device according to claim 5, wherein: a rotor (20) of the driving motor (9) is of a hollow structure, and the rotor (20) is connected with the rear end of the input shaft (2) through a hollow rotor shaft (11) sleeved on the fixed sleeve (1);

a gap is arranged between the fixed sleeve (1) and the hollow rotor shaft (11).

7. The self-locking electromechanical brake device according to claim 6, wherein:

the external thread at the front end of the input shaft (2) is a first external thread, the middle part of the planetary roller (4) is provided with a first external annular groove or a second external thread matched with the first external thread, the two end parts of the planetary roller (4) are provided with second external annular grooves, and the inner surface of the roller frame (6) is provided with an inner annular groove matched with the second external annular groove;

or the annular groove at the front end of the input shaft (2) is a first annular groove, the middle part of the planetary roller (4) is provided with an external thread matched with the first annular groove, the two end parts of the planetary roller (4) are provided with second external annular grooves, and the inner surface of the roller frame (6) is provided with an inner annular groove matched with the second external annular groove.

8. The self-locking electromechanical brake device according to claim 7, wherein: the front end of the output shaft (7) is provided with a braking force transmission shaft (12), and the braking force transmission shaft (12) is coaxial with the axis of the input shaft (2);

n is 6, 6 planetary rollers (4) are uniformly distributed along the circumference of the positioning ring (5).

9. The self-locking electromechanical brake device according to claim 8, wherein: and a dynamic sealing structure is arranged between the output shaft (7) and the front shell (8).

10. The self-locking electromechanical brake device according to claim 1, wherein: an exhaust hole (33) communicated with the sealing cavity is formed in the front shell (8).

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