CN112211924B - Electronic mechanical drum brake integrating traveling and parking braking functions - Google Patents

Electronic mechanical drum brake integrating traveling and parking braking functions Download PDF

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Publication number
CN112211924B
CN112211924B CN202011099936.6A CN202011099936A CN112211924B CN 112211924 B CN112211924 B CN 112211924B CN 202011099936 A CN202011099936 A CN 202011099936A CN 112211924 B CN112211924 B CN 112211924B
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China
Prior art keywords
ball screw
fixedly connected
brake
gear
shaft
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CN202011099936.6A
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CN112211924A (en
Inventor
汪选要
沈英健
马成程
郝鑫
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Anhui University of Science and Technology
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Anhui University of Science and Technology
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
    • F16D51/16—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis
    • F16D51/18—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes
    • F16D51/20—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes extending in opposite directions from their pivots
    • F16D51/22—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes extending in opposite directions from their pivots mechanically actuated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/14—Mechanical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/18—Electric or magnetic
    • F16D2121/24—Electric or magnetic using motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2127/00—Auxiliary mechanisms
    • F16D2127/06—Locking mechanisms, e.g. acting on actuators, on release mechanisms or on force transmission mechanisms

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

The invention discloses an electronic mechanical drum brake, which comprises a first shell, a second shell, an energy storage mechanism, a speed reduction mechanism, a torque motor and a brake mechanism, wherein the energy storage mechanism comprises a baffle plate, a spring, a first ball screw shaft, a first ball screw nut and an electromagnetic clutch, one side of the baffle plate is fixedly connected with one end of the spring, the other end of the spring is fixedly connected with the inner wall of the first shell, the other side of the baffle plate is fixedly connected with the first ball screw nut, and the first ball screw shaft sequentially penetrates through the first ball screw nut, the baffle plate and the spring to be fixedly connected with the electromagnetic clutch. According to the invention, elastic potential energy is released by the energy storage mechanism, and the potential energy is converted into kinetic energy of cam rotation through the speed reducing mechanism, the ball screw pair and the connecting rod mechanism, so that the brake shoe is expanded, and finally the friction lining is pressed against the brake drum to realize parking brake. The invention has the advantages of good braking performance, high response speed, high reliability and convenient modification.

Description

Electronic mechanical drum brake integrating traveling and parking braking functions
Technical Field
The invention relates to the technical field of automobile braking, in particular to an electronic mechanical drum brake.
Background
With the increasing importance of the safety of the automobile and the continuous development of the electronic control technology of the automobile, the brake-by-wire represented by the Electronic Mechanical Brake (EMB) becomes the key development direction of the automobile brake technology. The EMB system abandons many defects of the traditional brake system of the automobile, and is more suitable for the future development trend of automobile electromotion, intellectualization, light weight and integration.
Part of the electronic mechanical brake devices adopt a self-locking structure to realize parking braking, but the self-locking structure has lower transmission efficiency and higher requirement on motor type selection.
The utility model with the patent number of CN201020536897.7 discloses an automobile electronic mechanical brake, which comprises a motor, a brake friction plate and a brake disc, wherein a nut driven by the motor through a transmission mechanism is arranged at the inner side of a motor rotor, a thread mandrel matched with the nut is arranged in the nut, and the end part of the thread mandrel is connected with the brake friction plate; the outer end of the nut is fixedly provided with a ratchet wheel and a one-way limiting pin capable of braking the ratchet wheel, and the end part of the one-way limiting pin is connected with the armature of the relay. The integrated design of service braking and parking braking of the electronic mechanical brake is realized, the existing pull rope type hand brake mechanism is omitted, the installation is simple, the maintenance is easy, and the space can be effectively saved.
Although above-mentioned utility model has realized service brake and parking braking integrated design, still have some problems, like the parking braking to well heavy vehicle, the structural strength and the life of one-way spacer pin can't satisfy the requirement.
Disclosure of Invention
In order to solve the problems, the invention provides an electronic mechanical drum brake, which adopts a ball screw mechanism and a planetary gear train mechanism on the basis of an automobile pneumatic brake, can quickly eliminate a brake clearance, has high transmission efficiency and reduces the requirement of motor type selection; meanwhile, the energy storage mechanism is arranged, parking braking can be achieved, and compared with the structure of the one-way limiting pin, the parking braking device is higher in reliability and longer in service life.
The technical solution of the invention is as follows:
the utility model provides an electronic machinery drum brake, includes first casing, second casing, energy storage mechanism, reduction gears, torque motor and arrestment mechanism, its characterized in that: the energy storage mechanism and the speed reduction mechanism are both arranged inside the first shell, the energy storage mechanism comprises a baffle plate, a spring, a first ball screw shaft, a first ball screw nut and an electromagnetic clutch, one side of the baffle plate is fixedly connected with one end of the spring, the other end of the spring is fixedly connected with the inner wall of the first shell, the other side of the baffle plate is fixedly connected with the first ball screw nut, the first ball screw shaft sequentially penetrates through the first ball screw nut, the baffle plate and the spring to be fixedly connected with the electromagnetic clutch, the first ball screw shaft is rotatably connected with the first ball screw nut, the first ball screw shaft penetrates through the planet carrier to be fixedly connected with the first half-shaft gear, and the electromagnetic clutch is fixedly connected with the inner wall of the first shell;
the speed reducing mechanism comprises a first bevel gear, a second bevel gear, a speed reducing mechanism end cover, a planetary gear carrier, a first planetary gear, a second planetary gear, a first half shaft gear, a second ball screw shaft and a second ball screw nut, the second bevel gear is fixedly connected with the speed reducing mechanism end cover, the planetary gear carrier is fixedly connected with the second bevel gear, the second bevel gear is meshed with the first bevel gear, the first bevel gear is fixedly connected with one end of a motor output shaft, the other end of the motor output shaft is fixedly connected with an electromagnetic power-off brake, the electromagnetic power-off brake is fixedly connected with the inner wall of the second shell, the first planetary gear, the second planetary gear, the first half shaft gear and the second half shaft gear are all arranged in the planetary gear carrier, and the first planetary gear, the first half shaft gear, the second half shaft gear and the second half shaft gear are respectively arranged in the planetary gear carrier, And the second half shaft gear is meshed, the second planetary gear is respectively meshed with the first half shaft gear and the second half shaft gear, one end of the second ball screw shaft sequentially penetrates through the end cover of the speed reducing mechanism, the second bevel gear and the planetary gear carrier to be fixedly connected with the second half shaft gear, and the other end of the second ball screw shaft is rotatably connected with the second ball screw nut.
Preferably, one end of the second ball screw nut is fixedly connected with a push rod, the push rod is rotatably connected with one end of a connecting rod, and the other end of the connecting rod is fixedly connected with one end of the camshaft.
Preferably, the other end of the cam shaft penetrates through the support and the brake bottom plate in sequence to be fixedly connected with the cam, two sides of the cam are respectively in rolling connection with the first roller and the second roller, the first roller is rotatably connected with the first brake shoe, and the second roller is rotatably connected with the second brake shoe.
Preferably, a first friction lining and a second friction lining are respectively arranged on the outer sides of the first brake shoe and the second brake shoe, the first brake shoe is fixedly connected with the first friction lining, the second brake shoe is fixedly connected with the second friction lining, a first return spring and a second return spring are arranged between the first brake shoe and the second brake shoe, and two ends of the first return spring and two ends of the second return spring are respectively fixedly connected with corresponding positions of the first brake shoe and the second brake shoe.
Preferably, the bottom ends of the first brake shoe and the second brake shoe are respectively and rotatably connected with a boss, and the boss is fixedly installed at the bottom end of the brake base plate.
Compared with the prior art, the invention has the technical effects and advantages that:
1. the response speed of implementing and releasing the brake is high, and the brake has the functions of service brake and parking brake
2. The planetary gear train structure is adopted, the transmission efficiency is high, and meanwhile, the link mechanism is adopted to carry out two-stage reinforcement, so that the requirement on type selection of the motor is reduced
3. Reliable and durable parking braking force is provided through the energy storage mechanism, and the reliability and the service life are improved compared with those of a limiting pin
4. Can be directly refitted on the basis of the prior air pressure brake
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of an embodiment of the present invention;
FIG. 3 is a schematic view of the coupling of the speed reducing mechanism and the energy storing mechanism of the present invention;
FIG. 4 is a schematic diagram of the reduction mechanism and the energy storage mechanism;
FIG. 5 is a schematic view of the retarding mechanism of the present invention;
FIG. 6 is a schematic view of the energy storage mechanism of the present invention;
FIG. 7 is a schematic view of the braking mechanism of the present invention;
FIG. 8 is a sectional view of the ball screw;
FIG. 9 is a structural view of an electromagnetic clutch;
FIG. 10 is a cross-sectional view of an electromagnetic power-off brake;
in the figure: 101 first housing, 102 second housing, 201 baffle, 202 spring, 203 first ball screw shaft, 204 first ball screw nut, 205 electromagnetic clutch, 2051 yoke, 2052 coil, 2053 armature plate, 2054 brake pad, 2055 keyway, 206 ball, 301 first bevel gear, 302 second bevel gear, 303 reduction mechanism end cap, 304 planet carrier, 305 first planet gear, 306 second planet gear, 307 first half shaft gear, 308 second half shaft gear, 309 second ball screw shaft, 310 second ball screw nut, 401 torque motor output shaft, 402 torque motor, 403 electromagnetic loss brake, 4031 brake disc, 4032 mounting plate, 4033 spline housing, 4034 armature, 4035 spring, 4036 yoke, 501 brake spider, 502 cam, 503 first roller, 504 second roller, 505 first brake shoe, 506 second brake shoe, 507 first friction pad, 508 second friction pad, 509 first return spring, 509 second return spring, 510 second return spring, 511 boss, 601 push rod, 602 connecting rod, 603 camshaft, 604 support, 701 moving direction I, 702 moving direction II, 703 rotating direction I, 704 rotating direction II, 705 rotating direction III and 706 rotating direction IV.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, their indicated orientations or positional relationships are based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The working principle is as follows:
as shown in fig. 3-4.
When the parking brake is performed, the first bevel gear 301, the second bevel gear 302 and the planet gear carrier 304 are fixed, the first side gear 307 and the second side gear 308 can rotate, the spring 202 releases elastic potential energy to drive the first side gear 307 to rotate through the ball screw pair, and the first side gear 307 drives the second side gear 308 to rotate through the first planet gear 305 and the second planet gear 306, so that the parking brake is realized.
When the parking brake is released, the spring 202 is first compressed, in this process, the second side gear 308 is not rotated, the first bevel gear 301 and the first side gear 307 are rotated, the power output from the torque motor 402 is transmitted to the first side gear 307 via the first bevel gear 301, the second bevel gear 302, the first planetary gear 305, and the second planetary gear 306, the first side gear 307 moves the damper 201 via the ball screw pair to compress the spring 202, and then the electromagnetic clutch 205 is energized to lock the first ball screw shaft 203, and the first side gear 307 is fixed, so that the spring 202 is held in a compressed state. Then, the parking brake is released, in the process, the first side gear 307 is fixed, the first bevel gear 301 and the second side gear 308 can rotate, and the power output by the torque motor 402 is transmitted to the second side gear 308 via the first bevel gear 301, the second bevel gear 302, the first planetary gears 305, and the second planetary gears 306. The direction of rotation of the second side gear 308 may be controlled by adjusting the direction of rotation of the output shaft of the torque motor 402 to release the parking brake.
In the service braking and service braking release mode, the first side gear 307 is fixed, the first bevel gear 301 and the second side gear 308 can rotate, and the power output by the torque motor 402 is transmitted to the second side gear 308 through the first bevel gear 301, the second bevel gear 302, the first planetary gear 305 and the second planetary gear 306. At this time, the rotational direction of the second side gear 308 can be controlled by adjusting the rotational direction of the output shaft of the torque motor 402, thereby achieving service braking and service brake release.
The specific implementation working process of the invention is as follows:
and (3) parking braking process:
before parking braking, the electromagnetic power-off brake 403 is in an electrified state, and the motor output shaft 401 can freely rotate; the electromagnetic clutch 205 is in an energized state, the first ball screw shaft 203 is locked, and the spring 202 is in a compressed state.
As shown in fig. 1-10, when the driver turns on the parking brake switch, the electromagnetic power-off brake 403 is powered off, and the torque motor output shaft 401 is locked; the electromagnetic clutch 205 is de-energized, and the first ball screw shaft 203 can rotate freely. Under the action of the spring 202 releasing elastic potential energy, the baffle 201 drives the second ball screw nut 204 to move along the direction 701, the second ball screw nut 204 drives the second ball screw shaft 203 to rotate along the direction 706 through the ball screw pair, and the second ball screw shaft 203 drives the first half-shaft gear 307 to rotate along the direction 706. Because the torque motor output shaft 401 is locked, the first bevel gear 301, the second bevel gear 302 and the planet carrier 304 are fixed, the first half-shaft gear 307 drives the second half-shaft gear 308 to rotate along the direction 705 through the first planet gear 305 and the second planet gear 306, the second half-shaft gear 308 drives the second ball screw shaft 309 to rotate along the direction 705, the ball screw pair converts the rotation of the second ball screw shaft 309 along the direction 705 into the linear motion of the second ball screw nut 310 along the direction 701, the second ball screw nut 310 drives the push rod 601 to move along the direction 701, the connecting rod 602 drives the cam shaft 603 to rotate along the direction 703 under the push of the push rod 601, the cam shaft 603 drives the cam 502 to rotate along the direction 703, the brake shoe expands under the pushing action of the cam 502, and the friction lining on the brake shoe presses the brake drum to generate a braking force. The parking brake process is completed when the spring 202 has fully released the elastic potential energy.
Releasing the parking brake process:
before the parking brake is released, the automobile is in a parking brake state. The electromagnetic power-off brake 403 is powered off, and the torque motor output shaft 401 is locked; the electromagnetic clutch 205 is de-energized, and the first ball screw shaft 203 can rotate freely.
As shown in fig. 1-10, when the driver turns off the parking brake switch, the torque motor 402 and the electromagnetic power-off brake 403 are simultaneously energized, the motor output shaft 401 rotates the first bevel gear 301 in the direction 703, and the first bevel gear 301 rotates the second bevel gear 302, the planet carrier 304, the first planet gears 305, and the second planet gears 306 in the direction 705. Since the drum brake is in the braking state at this time, the second ball screw nut 310 and the push rod 601 cannot move in the direction 701, and the second side gear 308 cannot rotate in the direction 705; that is, when the first bevel gear 301 is rotated in the direction 703, the second side gear 308 cannot rotate. First and second planet gears 305 and 306 mounted within planet carrier 304 cooperate to rotate first axle gear 307 in direction 705. The first half-shaft gear 307 drives the first ball screw shaft 203 to rotate along the direction 705, the ball screw pair converts the rotation of the first ball screw shaft 203 along the direction 705 into the linear motion of the first ball screw nut 204 along the direction 702, so that the first ball screw nut 204 drives the baffle plate 201 to move along the direction 702, the spring 202 is compressed, after the spring 202 is compressed to the maximum position, the torque motor 402 is locked, at the moment, the electromagnetic clutch 205 is electrified, and the first ball screw shaft 203 is locked. Subsequently, the torque motor 402 rotates reversely, the motor output shaft 401 drives the first bevel gear 301 to rotate in the direction 704, the first bevel gear 301 drives the second bevel gear 302, the planet carrier 304, the first planetary gear 305 and the second planetary gear 306 to rotate in the direction 704, at this time, the first ball screw shaft 203 is locked, the first half shaft gear 307 is fixed, and the first planetary gear 305 and the second planetary gear 306 installed in the planet carrier 304 drive the second half shaft gear 308 to rotate in the direction 706 together. The second side gear 308 rotates the second ball screw shaft 309 in the direction 706, the ball screw pair converts the rotation of the first ball screw shaft 309 in the direction 706 into a linear motion of the second ball screw nut 310 in the direction 702, so that the second ball screw nut 310 drives the push rod 601 to move in the direction 702, the connecting rod 602 drives the cam shaft 603 to rotate in the direction 704 under the action of the push rod 601, the cam shaft 603 drives the cam 502 to rotate in the direction 704, the cam 502 does not push the brake shoe to open any more, the friction lining fixedly mounted on the brake shoe is separated from the brake drum, and the brake is released.
And (3) a service braking process:
before service braking, the electromagnetic power-off brake 403 is in an electrified state, and the motor output shaft 401 can rotate freely; the electromagnetic clutch 205 is in an energized state, and the first ball screw shaft 203 is locked.
As shown in fig. 1-10, when the driver depresses the brake pedal, the torque motor 402 is energized, and the motor output shaft 401 rotates the first bevel gear 301 in the direction 703. The first bevel gear 301 drives the second bevel gear 302, the planet carrier 304, the first planet gears 305 and the second planet gears 306 to rotate in the direction 705, at this time, the first ball screw shaft 203 is locked, the first half shaft gear 307 is fixed, and the first planet gears 305 and the second planet gears 306 installed in the planet carrier 304 drive the second half shaft gear 308 to rotate in the direction 705 together. The second side gear 308 drives the second ball screw shaft 309 to rotate along the direction 705, the ball screw pair converts the rotation of the second ball screw shaft 309 along the direction 705 into the linear motion of the second ball screw nut 310 along the direction 701, so that the second ball screw nut 310 drives the push rod 601 to move along the direction 701, the connecting rod 602 drives the cam shaft 603 to rotate along the direction 703 under the pushing of the push rod 601, the cam shaft 603 drives the cam 502 to rotate along the direction 703, the brake shoe is expanded under the pushing action of the cam 502, and the friction lining on the brake shoe presses the brake drum to generate braking force through friction.
And (3) releasing the service braking process:
before service braking is released, the electromagnetic power-off brake 403 is in a power-on state, and the motor output shaft 401 can rotate freely; the electromagnetic clutch 205 is in an energized state, and the first ball screw shaft 203 is locked. The drum brake is in a braking state.
As shown in fig. 1-10, when the driver releases the brake pedal, the torque motor 402 is energized, the motor output shaft 401 rotates the first bevel gear 301 in the direction 704, the first bevel gear 301 rotates the second bevel gear 302, the planet carrier 304, the first planetary gear 305 and the second planetary gear 306 in the direction 704, the first ball screw shaft 203 is locked, the first half shaft gear 307 cannot rotate, the first planetary gear 305 and the second planetary gear 306 installed in the planet carrier 304 rotate the second half shaft gear 308 in the direction 706, the second half shaft gear 308 rotates the second ball screw shaft 309 in the direction 706, the ball screw pair converts the rotation of the first ball screw shaft 309 in the direction 706 into the linear motion of the second ball screw nut 310 in the direction 702, so that the second ball screw nut 310 drives the push rod 601 to move in the direction 702, the connecting rod 602 drives the cam shaft 603 to rotate in the direction 704 under the action of the push rod 601, the cam shaft 603 drives the cam 502 to rotate in the direction 704, so that the cam 502 no longer pushes the brake shoes to open, the friction linings fixedly mounted on the brake shoes are separated from the brake drum, and the brake is released.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (5)

1. An electronic mechanical drum brake comprising a first housing (101), a second housing (102), an energy storage mechanism, a speed reduction mechanism, a torque motor (402), and a braking mechanism, characterized in that: the energy storage mechanism and the speed reduction mechanism are both arranged inside the first shell (101), the energy storage mechanism comprises a baffle plate (201), a spring (202), a first ball screw shaft (203), a first ball screw nut (204) and an electromagnetic clutch (205), one side of the baffle plate (201) is fixedly connected with one end of the spring (202), the other end of the spring (202) is fixedly connected with the inner wall of the first shell (101), the other side of the baffle plate (201) is fixedly connected with the first ball screw nut (204), the first ball screw shaft (203) sequentially penetrates through the first ball screw nut (204), the baffle plate (201), the spring (202) and the electromagnetic clutch (205) and is fixedly connected, the first ball screw shaft (203) is rotatably connected with the first ball screw nut (204), and the first ball screw shaft (203) penetrates through a planetary gear carrier (304) and is fixedly connected with a first half-shaft gear (307), the electromagnetic clutch (205) is fixedly connected with the inner wall of the first shell (101);
the speed reducing mechanism comprises a first bevel gear (301), a second bevel gear (302), a speed reducing mechanism end cover (303), a planetary gear carrier (304), a first planetary gear (305), a second planetary gear (306), a first half shaft gear (307), a second half shaft gear (308), a second ball screw shaft (309) and a second ball screw nut (310), wherein the second bevel gear (302) is fixedly connected with the speed reducing mechanism end cover (303), the planetary gear carrier (304) is fixedly connected with the second bevel gear (302), the second bevel gear (302) is meshed with the first bevel gear (301), the first bevel gear (301) is fixedly connected with one end of a motor output shaft (401), the other end of the motor output shaft (401) is fixedly connected with an electromagnetic power-off brake (403), and the electromagnetic power-off brake (403) is fixedly connected with the inner wall of the second shell (102), the first planetary gear (305), the second planetary gear (306), the first half shaft gear (307) and the second half shaft gear (308) are arranged inside the planetary gear carrier (304), the first planetary gear (305) is meshed with the first half shaft gear (307) and the second half shaft gear (308) respectively, the second planetary gear (306) is meshed with the first half shaft gear (307) and the second half shaft gear (308) respectively, one end of the second ball screw shaft (309) penetrates through the speed reduction mechanism end cover (303), the second bevel gear (302) and the planetary gear carrier (304) in sequence to be fixedly connected with the second half shaft gear (308), and the other end of the second ball screw shaft (309) is connected with the second ball screw nut (310) in a rotating mode.
2. An electromechanical drum brake according to claim 1, in which: one end of the second ball screw nut (310) is fixedly connected with a push rod (601), the push rod (601) is rotatably connected with one end of a connecting rod (602), and the other end of the connecting rod (602) is fixedly connected with one end of a cam shaft (603).
3. An electromechanical drum brake according to claim 2, in which: the other end of the cam shaft (603) penetrates through a support (604) and a brake bottom plate (501) in sequence to be fixedly connected with a cam (502), two sides of the cam (502) are respectively in rolling connection with a first roller (503) and a second roller (504), the first roller (503) is in rotating connection with a first brake shoe (505), and the second roller (504) is in rotating connection with a second brake shoe (506).
4. An electromechanical drum brake according to claim 3 in which: the outer sides of the first brake shoe (505) and the second brake shoe (506) are respectively provided with a first friction lining (507) and a second friction lining (508), the first brake shoe (505) is fixedly connected with the first friction lining (507), the second brake shoe (506) is fixedly connected with the second friction lining (508), a first return spring (509) and a second return spring (510) are arranged between the first brake shoe (505) and the second brake shoe (506), and two ends of the first return spring (509) and the second return spring (510) are respectively fixedly connected with corresponding positions of the first brake shoe (505) and the second brake shoe (506).
5. An electromechanical drum brake according to claim 4 in which: the bottom ends of the first brake shoe (505) and the second brake shoe (506) are respectively connected with a boss (511) in a rotating mode, and the boss (511) is fixedly installed at the bottom end of the brake bottom plate (501).
CN202011099936.6A 2020-10-15 2020-10-15 Electronic mechanical drum brake integrating traveling and parking braking functions Active CN112211924B (en)

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Application Number Priority Date Filing Date Title
CN202011099936.6A CN112211924B (en) 2020-10-15 2020-10-15 Electronic mechanical drum brake integrating traveling and parking braking functions

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Application Number Priority Date Filing Date Title
CN202011099936.6A CN112211924B (en) 2020-10-15 2020-10-15 Electronic mechanical drum brake integrating traveling and parking braking functions

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CN112211924A CN112211924A (en) 2021-01-12
CN112211924B true CN112211924B (en) 2022-02-08

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