CN116624530A

CN116624530A - Novel electromechanical actuating mechanism

Info

Publication number: CN116624530A
Application number: CN202310566035.0A
Authority: CN
Inventors: 刘赛赛; 臧传相; 刘寅虎; 牛瑞; 虞晓峰; 余毅权; 曹云丽; 吴青科; 朱奕典
Original assignee: Nanjing CRRC Puzhen Haitai Brake Equipment Co Ltd
Current assignee: Nanjing CRRC Puzhen Haitai Brake Equipment Co Ltd
Priority date: 2023-05-18
Filing date: 2023-05-18
Publication date: 2023-08-22

Abstract

The invention discloses a novel electromechanical actuating mechanism, which comprises a box body and a brake head assembly arranged on the box body and used for contacting and braking with wheels, wherein a lock nut is arranged on one side of the box body, a telescopic mechanism used for pushing the brake head assembly to contact with the wheels is arranged in the box body, a driving mechanism used for driving the telescopic mechanism to stretch out and draw back is arranged on the lower end face of the box body, the telescopic mechanism comprises a thrust sleeve, a ball screw nut, a ball screw and a connecting assembly, a needle bearing is arranged in the end, far away from the brake head assembly, of the thrust sleeve, and the needle bearing is arranged on the lock nut. The invention has simple structure, reasonable design, convenient installation and compact structure, is beneficial to realizing various functions, monitors the applied braking force in real time, feeds back the collected real braking force to the controller, and realizes the closed-loop control of the braking force by comparing the difference between the real braking force and the target braking force and adjusting the input target current.

Description

Novel electromechanical actuating mechanism

Technical Field

The invention relates to the technical field of railway vehicle braking systems, in particular to a novel electromechanical actuating mechanism.

Background

For railway vehicles, air braking or hydraulic braking is widely adopted, and the dependence on pressure air or hydraulic oil cannot be thoroughly eliminated. The air brake has the advantages that the air working pressure is low, the size of a brake cylinder is large, the air source and the storage structure have large requirements on the installation space, the brake noise is large, and the maintenance cost is high; the hydraulic braking structure has higher integration level and high working pressure, and once hydraulic oil leakage has great influence on braking, even influences the operation safety of the vehicle, and has higher maintenance and repair cost

With the electrification and intelligent development of the railway vehicle, the electrified degree needs to be further deepened as a power source of a railway braking system, and breakthroughs from meeting functions and improving performances to intelligence are realized.

Disclosure of Invention

The present invention is directed to a novel electromechanical actuator to solve the above-mentioned problems.

In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a novel electromechanical actuating mechanism, includes the box and sets up the brake head subassembly that is used for with the wheel contact braking on the box, one side of box is provided with lock nut, the inside of box is provided with the telescopic machanism that is used for promoting brake head subassembly and wheel contact, be provided with the actuating mechanism that is used for driving telescopic machanism flexible on the lower terminal surface of box, telescopic machanism is including:

the thrust sleeve is provided with a needle bearing in the interior of one end of the thrust sleeve, which is far away from the brake head assembly, and the needle bearing is arranged on the lock nut;

the ball screw nut is arranged on the inner side wall of the thrust sleeve;

the ball screw is in threaded connection with the ball screw nut;

and the connecting component is arranged at one end of the ball screw, which is far away from the lock nut, and is used for being connected with the brake head component.

As a further improvement of the present invention, the driving mechanism includes:

the motor is arranged on the lower end face of the box body, and a small bevel gear is arranged on a rotating shaft of the motor;

the large conical gear is arranged on the outer surface of the thrust sleeve, and the small conical gear is in meshed connection with the large conical gear;

and the electromagnetic brake is arranged at one end of the motor far away from the box body and used for locking the rotating shaft of the motor.

As a further improvement of the present invention, the connection assembly includes:

the screw rod head is arranged at one end of the ball screw far away from the lock nut,

the two ends of the double-end stud are respectively connected with the screw rod head and the brake head assembly;

and the pressure sensor is arranged outside the double-end stud in a hollow structure and used for detecting the output pressure of the ball screw.

As a further improvement of the invention, a limit mechanism for limiting the large bevel gear is arranged at one end of the box body far away from the lock nut, and the limit mechanism comprises:

the first positioning ring is arranged on the outer surface of the thrust sleeve and positioned on one side of the large conical gear;

the deep groove ball bearing is arranged between the box body and the thrust sleeve, and one side of the deep groove ball bearing is connected with the first positioning ring.

As a further improvement of the invention, a positioning assembly is arranged inside the thrust sleeve, and the positioning assembly comprises:

the bearing support seat is arranged on the inner side wall of the thrust sleeve;

the thrust cylindrical roller bearing is arranged on one side of the bearing supporting seat;

and the second positioning ring is arranged between the lock nut and the thrust cylindrical roller bearing and is positioned at the outer side of the ball screw.

As a further improvement of the invention, the end of the box body far away from the lock nut is provided with a dust ring cover for protecting the connecting assembly.

As a further improvement of the invention, a gasket matched with the ball screw is arranged on one side of the lock nut close to the box body.

As a further improvement of the invention, the brake head assembly comprises a brake head hanging piece arranged on the box body and a brake head piece used for braking, and the brake head hanging piece and the box body are connected through a pin shaft and a torsion spring.

As a further improvement of the invention, a thermistor for calculating the real-time temperature of the motor by measuring the resistance value is arranged in the motor.

As a further development of the invention, the electromagnetic brake comprises a stator, a rotor connected to the motor shaft and a friction disk for friction braking.

Compared with the prior art, the invention has the beneficial effects that:

the invention is provided with the telescopic mechanism, the telescopic mechanism comprises the thrust sleeve, the ball screw nut, the ball screw and the connecting component, and the driving mechanism for driving the telescopic mechanism to stretch is also provided, the driving mechanism comprises the motor, the large conical gear and the electromagnetic brake, the installation is convenient, the structure is compact, the realization of various functions is facilitated, the braking force applied is monitored in real time, the collected real braking force is fed back to the controller, and the controller adjusts the input target current by comparing the difference between the real braking force and the target braking force, thereby realizing the closed-loop control of the braking force.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is a right side view of the entire present invention;

fig. 3 is a left side view of the overall invention.

In the figure: 1. a case; 2. a brake head assembly; 21. a brake head hanger; 22. a brake head member; 3. a lock nut; 4. a telescoping mechanism; 41. a thrust sleeve; 411. needle roller bearings; 42. a ball screw nut; 43. a ball screw; 44. a connection assembly; 441. a wire rod head; 442. a double-ended stud; 443. a pressure sensor; 5. a driving mechanism; 51. a motor; 52. a pinion bevel gear; 53. a large bevel gear; 54. an electromagnetic brake; 6. a limiting mechanism; 61. a first positioning ring; 62. deep groove ball bearings; 7. a positioning assembly; 71. a bearing support; 72. thrust cylindrical roller bearings; 73. a second positioning ring; 8. a dust ring cover; 9. a gasket.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

It will be understood that when an element is referred to as being "mounted," "connected," or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. It is to be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have the orientation specific to the specification, be constructed and operated in the specific orientation, and thus should not be construed as limiting the present invention.

As a further refinement of the present invention, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

Example 1

Referring to fig. 1-3, the present invention provides a technical solution: the utility model provides a novel electromechanical actuating mechanism, including box 1 and install be used for with the brake head subassembly 2 of wheel contact braking on box 1, one side of box 1 has lock nut 3 through threaded connection, the internally mounted of box 1 has the telescopic machanism 4 that is used for promoting brake head subassembly 2 and wheel contact, install the actuating mechanism 5 that is used for driving telescopic machanism 4 to stretch out and draw back on the lower terminal surface of box 1, telescopic machanism 4 is including thrust sleeve 41, ball screw nut 42, ball screw 43 and coupling assembling 44, thrust sleeve 41 keeps away from the internally mounted of brake head subassembly 2 one end has bearing 411, bearing 411 installs on lock nut 3, ball screw nut 42 passes through the bolt fastening on thrust sleeve 41's inside wall, ball screw 43 and ball screw nut 42 threaded connection, coupling assembling 44 installs the one end that lock nut 3 was kept away from at ball screw 43 and is used for being connected with brake head subassembly 2.

The connecting assembly 44 comprises a screw rod head 441, a double-end stud 442 and a pressure sensor 443, wherein the screw rod head 441 is arranged at one end of the ball screw rod 43 far away from the lock nut 3, two ends of the double-end stud 442 are respectively connected with the screw rod head 441 and the brake head assembly 2, the pressure sensor 443 is arranged at the outer side of the double-end stud 442 in a hollow structure and is used for detecting the output pressure of the ball screw rod 43, the pressure sensor 443 is arranged at the outer side of the double-end stud 442 and is led to the connector through the inside of the box body, the dust ring cover 8 for protecting the connecting assembly 44 is arranged at one end of the box body 1 far away from the lock nut 3, and the protection level of the mechanism is improved.

A washer 9 matched with the ball screw 43 is arranged on one side of the lock nut 3 close to the box body 1.

The brake head assembly 2 comprises a brake head hanger 21 mounted on the box 1 and a brake head hanger 22 for braking, wherein the brake head hanger 21 and the box 1 are connected through a pin shaft and a torsion spring.

When the hydraulic brake system is used, the thrust sleeve 41 is driven to rotate through the driving mechanism 5, the thrust sleeve 41 drives the ball screw nut 42 to rotate, so that the ball screw 43 axially moves, the brake head assembly 2 is pushed to be in contact with the wheels through the connecting assembly 44 to decelerate, and meanwhile, the output pressure is monitored in real time through the pressure sensor 443.

Example 2

Referring to fig. 1-3, the invention further provides a technical scheme, which comprises a driving mechanism 5, the driving mechanism 5 comprises a motor 51, a large conical gear 53 and an electromagnetic brake 54, the motor 51 is fixed on the lower end face of the box body 1 through a bolt, the motor 51 belongs to a permanent magnet direct current torque motor in a servo motor, a small conical gear 52 is arranged on a rotating shaft of the motor 51 through a screw and a gasket, the motor 51 comprises a stator rotor, a motor shaft, an encoder, a hall element and the like, a rotating magnetic field is generated after the motor stator is electrified, the rotating magnetic field drives the motor rotor to rotate to generate torque, the motor encoder marks the relative rotation angle of the motor shaft and outputs a real-time signal, the hall element inputs and outputs an electric signal through a hard wire, the motor shaft relative rotation angle is marked, the real-time signal output function is realized, the large conical gear 53 is sleeved on the outer surface of the thrust sleeve 41 through a key, the small conical gear 52 is meshed with the large conical gear 53, and the electromagnetic brake 54 is arranged on one end of the motor 51 far away from the box body 1 and used for locking the rotating shaft of the motor 51.

The transmission structure in the box body 1 enables the ball screw nut 42 to rotate only in the axial direction, the axial movement is limited, the small bevel gear 52 drives the large bevel gear 53 and the ball screw nut 42 to rotate, and the ball screw nut 42 is pushed out by the ball screw 43 during rotation.

The thermistor for calculating the real-time temperature of the motor 51 is arranged in the motor 51 by measuring the resistance value, the resistance value of the thermistor gradually decreases along with the temperature rise, and the relative temperature of the motor 51 is estimated by measuring the resistance value of the thermistor.

The electromagnetic brake 54 comprises a stator, a rotor connected with the rotating shaft of the motor 51 and a friction disc for friction braking, the electromagnetic brake 54 belongs to a normally closed brake, when the electromagnetic brake is electrified, electromagnetic force generated by the brake overcomes the force of a spring to separate the friction disc from the stator, the rotor rotates along with a motor shaft, when the electromagnetic brake is in failure, the electromagnetic force is not generated by the brake, the friction disc generates friction with the stator under the action of the spring, and the friction force acts on the motor shaft through the rotor to stop the rotation of the motor shaft;

the electromagnetic brake 54 has a bidirectional mechanical release function, the external dust cover is removed firstly, the electromagnetic brake 54 is released manually, a wrench is sleeved in a hexagonal hole in the rear end of the motor shaft, and the motor shaft is rotated in the opposite braking direction, so that the motor shaft 51 drives the small bevel gear 52, the large bevel gear 53 and the ball screw nut 42 to rotate in the opposite braking direction, and the braking is released.

The motor 51 comprises a motor stator composed of a three-phase winding and laminated silicon steel sheets, wherein the magnetic steel adopts a surface-mounted motor rotor, the winding is formed by winding polyester enameled wires (according to environmental requirements or adopting polyester sub-enameled wires) according to fixed turns, the winding is isolated from the silicon steel sheets by insulating paper, the two ends of the winding are shaped by adopting a special process, the electric gap can be ensured to be less than 1mm, the motor stator is composed of a stator iron core and the magnetic steel, the magnetic steel is bonded in an iron core outer ring groove, the magnetic steel is formed by bonding neodymium iron boron magnetic powder by adding an adhesive, and the coercive force of the magnet is improved by ageing heat treatment;

the encoder is a hollow rotary encoder, the encoder code wheel is fixed with the rotor support, the encoder stator part is fixed on the rear cover, and when the motor rotor rotates, the rotor support is driven to rotate, and the rotor support drives the encoder code wheel to rotate.

When the motor is used, before braking is implemented, feedback information of the encoder is cleared, the initial angle of the motor shaft relative to the motor shell is considered to be zero, when the motor 51 rotates positively or reversely, the encoder outputs a positive electric signal or a negative electric signal, the rotating angle of the motor shaft can be obtained through integration and conversion of the electric signal, in the braking process, the motor 51 works to drive the small bevel gear 52 to drive, the small bevel gear 52 rotates to drive the large bevel gear 53 to rotate, the thrust sleeve 41 is driven to rotate, the ball screw 43 axially moves, the driving mechanism 5 has a braking force closed-loop control function, a controller controls to input target current to the executing mechanism according to target braking force, the driving mechanism 5 carries out braking, the pressure sensor 443 monitors braking force applied by the driving mechanism 5 and feeds back the collected real braking force to the controller, and the controller adjusts the input target current by comparing the difference between the real braking force and the target braking force, so that closed-loop control of the braking force is realized.

Example 3

Referring to fig. 1-3, the present invention further provides a technical solution: the end of the box body 1 far away from the lock nut 3 is provided with a limiting mechanism 6 for limiting the large conical gear 53, the limiting mechanism 6 comprises a first positioning ring 61 and a deep groove ball bearing 62, the first positioning ring 61 is arranged on the outer surface of the thrust sleeve 41 and is positioned on one side of the large conical gear 53, the deep groove ball bearing 62 is arranged between the box body 1 and the thrust sleeve 41, and one side of the deep groove ball bearing 62 is connected with the first positioning ring 61;

the thrust sleeve 41 is internally provided with a positioning assembly 7, the positioning assembly 7 comprises a bearing support seat 71, a thrust cylindrical roller bearing 72 and a second positioning ring 73, the bearing support seat 71 is arranged on the inner side wall of the thrust sleeve 41, the thrust cylindrical roller bearing 72 is arranged on one side of the bearing support seat 71, and the second positioning ring 73 is arranged between the lock nut 3 and the thrust cylindrical roller bearing 72 and is positioned on the outer side of the ball screw 43.

In the braking process, the motor 51 works to drive the small bevel gear 52 to drive, the small bevel gear 52 rotates to drive the large bevel gear 53 to rotate, the thrust sleeve 41 is driven to rotate, the ball screw 43 axially moves, the thrust sleeve 41 drives the ball screw nut 42 to rotate, the ball screw 43 axially moves, the brake head assembly 2 is pushed to be in contact with wheels to reduce speed through the connecting assembly 44, meanwhile, the output pressure is monitored in real time through the pressure sensor 443, the installation is convenient, the structure is compact, the realization of various functions is facilitated, the braking force applied is monitored in real time, the acquired real braking force is fed back to the controller, and the controller adjusts the input target current through comparing the difference between the real braking force and the target braking force, so that the braking force closed-loop control is realized.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a novel electromechanical actuator, includes box (1) and sets up brake head subassembly (2) that are used for with wheel contact braking on box (1), its characterized in that: one side of box (1) is provided with lock nut (3), the inside of box (1) is provided with telescopic machanism (4) that are used for promoting brake head subassembly (2) and wheel contact, be provided with on the lower terminal surface of box (1) and be used for driving telescopic machanism (4) telescopic actuating mechanism (5), telescopic machanism (4) are including:

a needle bearing (411) is arranged in one end, far away from the brake head assembly (2), of the thrust sleeve (41), and the needle bearing (411) is arranged on the lock nut (3);

a ball screw nut (42), the ball screw nut (42) being provided on an inner side wall of the thrust sleeve (41);

a ball screw (43), wherein the ball screw (43) is in threaded connection with a ball screw nut (42);

and the connecting assembly (44) is arranged at one end of the ball screw (43) away from the locking nut (3) and is used for being connected with the brake head assembly (2).

2. The novel electromechanical actuator according to claim 1, wherein: the driving mechanism (5) comprises:

the motor (51) is arranged on the lower end face of the box body (1), and a small bevel gear (52) is arranged on a rotating shaft of the motor (51);

a large bevel gear (53), wherein the large bevel gear (53) is arranged on the outer surface of the thrust sleeve (41), and the small bevel gear (52) is in meshed connection with the large bevel gear (53);

and the electromagnetic brake (54) is arranged at one end, far away from the box body (1), of the motor (51) and is used for locking the rotating shaft of the motor (51).

3. The novel electromechanical actuator according to claim 1, wherein: the connecting assembly (44) comprises:

the screw rod head (441) is arranged at one end of the ball screw (43) far away from the lock nut (3);

a stud (442), both ends of the stud (442) being connected to the screw head (441) and the brake head assembly (2), respectively;

and a pressure sensor (443), wherein the pressure sensor (443) is arranged outside the stud (442) in a hollow structure and is used for detecting the output pressure of the ball screw (43).

4. The novel electromechanical actuator according to claim 2, wherein: one end of the box body (1) far away from the lock nut (3) is provided with a limiting mechanism (6) used for limiting the large bevel gear (53), and the limiting mechanism (6) comprises:

a first positioning ring (61), the first positioning ring (61) being provided on the outer surface of the thrust sleeve (41) on one side of the large bevel gear (53);

and the deep groove ball bearing (62) is arranged between the box body (1) and the thrust sleeve (41), and one side of the deep groove ball bearing (62) is connected with the first positioning ring (61).

5. The novel electromechanical actuator according to claim 1, wherein: the inside of thrust sleeve (41) is provided with locating component (7), locating component (7) are including:

a bearing support (71), the bearing support (71) being disposed on an inner sidewall of the thrust sleeve (41);

a thrust cylindrical roller bearing (72), the thrust cylindrical roller bearing (72) being provided on one side of the bearing support seat (71);

and a second positioning ring (73), wherein the second positioning ring (73) is arranged between the lock nut (3) and the thrust cylindrical roller bearing (72) and is positioned outside the ball screw (43).

6. The novel electromechanical actuator according to claim 1, wherein: one end of the box body (1) far away from the lock nut (3) is provided with a dust ring cover (8) for protecting the connecting component (44).

7. The novel electromechanical actuator according to claim 1, wherein: one side of the lock nut (3) close to the box body (1) is provided with a gasket (9) matched with the ball screw (43).

8. The novel electromechanical actuator according to claim 1, wherein: the brake head assembly (2) comprises a brake head hanging piece (21) arranged on the box body (1) and a brake head piece (22) for braking, wherein the brake head hanging piece (21) is connected with the box body (1) through a pin shaft and a torsion spring.

9. The novel electromechanical actuator according to claim 2, wherein: and a thermistor for calculating the real-time temperature of the motor (51) by measuring the resistance value is arranged in the motor (51).

10. The novel electromechanical actuator according to claim 2, wherein: the electromagnetic brake (54) comprises a stator, a rotor connected with the rotating shaft of the motor (51) and a friction disc for friction braking.