CN217736104U - Electronic mechanical brake for vehicle - Google Patents

Abstract

The utility model discloses an electronic mechanical brake for vehicles, which comprises a gear box assembly, a bracket component, a shell, a lead screw transmission unit and a force feedback unit; the gear box assembly comprises a motor, a motor groove, a gear box body, an electrical system interface and a gear transmission system; the bracket component comprises an outer friction plate, an inner friction plate, a bracket and a guide pin; the shell comprises a bottom mounting surface, a shell cylinder hole, a shell rotation stopping groove and a shell boss; the screw transmission unit comprises a screw spline, a screw shaft, a screw gasket, a screw, a nut piston gasket and a thrust bearing; the structure of the nut comprises a nut inner cavity and a nut end face; the nut piston gasket structurally comprises an installation excircle, a first sealing groove, a rotation stopping groove, a gasket stressed end face, friction plate interface characteristics and a gasket outline; the force feedback unit comprises an outer gasket, an inner gasket and a force sensor.

Description

Electronic mechanical brake for vehicle

Technical Field

The utility model belongs to the technical field of car arresting gear, a electromechanical brake for vehicle is related to.

Background

The electronic mechanical brake is applied to a vehicle braking system; with the discovery of new technologies such as vehicle electronic control and automatic driving, new requirements are put forward on the electronic control of a vehicle brake system.

The traditional vehicle braking system adopts a hydraulic type braking system, and a driver needs to pressurize the braking system through a brake pedal in the braking process so as to realize the braking function; such a conventional braking system is not very advantageous for the realization of functions such as automatic driving of a vehicle: the traditional hydraulic brake system comprises a hydraulic brake, a brake pipeline, a brake master cylinder for driving, a booster and a related control unit; the hydraulic brake adopts a mode that a piston is pushed by hydraulic pressure to move, the piston is arranged in a cylinder hole of the shell, and the friction plate is pushed by the hydraulic pressure to be attached to the brake disc in the braking process to realize the braking function. The system adopts a purely mechanical form, the brake is relatively simple, but the operation of the brake can be completed only by the mutual cooperation of the control units such as a brake master cylinder, a booster and the like, a brake pipeline and the like, and the whole brake system is relatively complex; meanwhile, the purely mechanical structural form is not beneficial to the development of vehicle automation and electric control.

With the development of electric vehicles and hybrid power technologies, new and new requirements are put on the electric control of vehicle brake systems, and an electromechanical brake directly driven by a motor is a good technical route.

SUMMERY OF THE UTILITY MODEL

In order to solve the deficiencies existing in the prior art, the utility model aims to provide an electronic mechanical brake for vehicle realizes the complete automatically controlled of vehicle through adopting motor drive's arrestment mechanism.

The utility model discloses with current similar structure's an important difference be small, through the adjustment of transmission system and the inside lead screw mechanism arrangement in casing jar hole and structure, the volume of reduction stopper that can be by a wide margin to improve the brake in the arrangeability in limited vehicle space. The utility model has the main advantages that the difference of the vehicle to the brake capacity is distinguished, the utility model is suitable for the miniaturization of the vehicle and the vehicle type with small braking force demand; more typically be used for small-size car and rear wheel system, simultaneously the utility model discloses a gear locking and cooperation stopper can also realize the parking function.

The utility model discloses an use electromechanical brake, can satisfy:

1. the vehicle brake system is electrically controlled, and technical conditions can be provided for automatic driving;

2. the vehicle brake system has a simplified structure and relatively simple system matching.

The electronic mechanical brake simplifies a traditional brake hydraulic system into a transmission system driven by a direct current motor, the braking function drives a gear box through the direct current motor, and the gear box amplifies the torque of the motor and transmits the torque to a lead screw transmission unit; the screw transmission unit converts the torque of the motor into linear thrust and pushes the friction plate of the brake to be attached to a traditional brake disc so as to realize the braking function of the vehicle.

Specifically, the utility model provides an electronic mechanical brake for vehicle, the stopper includes gear box assembly, bracket component, casing, lead screw drive unit, force feedback unit;

the gear box assembly comprises a motor, a motor groove, a gear box body, an electrical system interface and a gear transmission system;

the bracket component comprises an outer friction plate, an inner friction plate, a bracket and a guide pin;

the shell comprises a bottom mounting surface, a shell cylinder hole, a shell rotation stopping groove and a shell boss;

the screw transmission unit comprises a screw spline, a screw shaft, a screw gasket, a screw, a nut piston gasket and a thrust bearing; the structure of the nut comprises a nut inner cavity and a nut end face; the nut piston gasket structurally comprises an installation excircle, a first sealing groove, a rotation stopping groove, a gasket stressed end face, a friction plate interface feature and a gasket outline;

the force feedback unit comprises an outer gasket, an inner gasket and a force sensor.

The gear box assembly is attached and installed on the bottom installation surface at the corresponding position of the shell through the installation interfaces which are communicated with the two sides of the gear box assembly through gear box installation bolts; a gear transmission system in the gear box assembly and a shell cylinder hole are coaxially arranged; the motor is arranged in a motor groove, and the axis of the motor groove is parallel to the axis of a cylinder hole of the shell; the electric system interface is positioned on the gear box assembly, and according to the arrangement form, the axial direction of the electric system interface can be parallel to or vertical to the axial line of a cylinder hole of the shell; the gear transmission system is positioned in the gearbox body, an inner hole spline is arranged on an output shaft of the gear transmission system, and the gear transmission system is meshed with the lead screw spline to transmit output torque.

The outer friction plate and the inner friction plate are respectively arranged on two sides of a U-shaped space in the bracket; the shell is installed on the bracket component through a shell installation bolt and the guide pin.

The screw rod transmission unit is arranged inside the shell cylinder hole and is coaxially arranged with the shell cylinder hole; a screw gasket is arranged on the screw; the nut piston gasket is arranged at the end part of the nut, which is far away from the gear box assembly, and the axial acting force is uniformly applied to the inner friction sheet; the mounting excircle is matched with a nut inner cavity on a nut in a press-fit mode and is kept fixed; the stress end face of the gasket is attached to the end face of the nut, and the axial force generated by the nut is transmitted; the first sealing groove is positioned on the mounting excircle of the nut piston gasket in a grooving mode, and the sealing effect between the nut piston gasket and the nut is realized through the matching of the mounted first sealing ring and the inner cavity of the nut; the rotation stopping groove is used for preventing the nut from generating rotary motion; the friction plate interface features are installed in a matched mode with the inner friction plate; the diameter of the outer contour of the gasket is larger than the outer diameter of the nut; the thrust bearing is arranged between the screw rod gasket and the force feedback unit. In addition, a second sealing ring is arranged in a second sealing groove corresponding to the shell and is used for being matched with the outer ring of the screw nut to realize the sealing effect between the shell and the screw nut.

The force feedback unit is arranged in the cylinder hole of the shell and is used for outputting the axial force generated by the lead screw transmission unit; the force sensor in the force feedback unit is not limited to a specific form, and can be beneficial to system arrangement, typically, a diaphragm type force sensor can be adopted, and the thickness of the sensor is less than 2mm.

Specifically, the force feedback unit is mounted on a screw shaft, and the outer gasket and the inner gasket are both planar gaskets; an L-shaped rotation stopping feature is arranged on the inner gasket at a position far away from the screw shaft and is matched with a rotation stopping groove on the shell to prevent the inner gasket from rotating in the transmission process; the pressure generated by the screw transmission unit in transmission is output from an output terminal arranged on a cylinder hole of the shell through a diaphragm type force sensor; the output terminal is arranged on the outer circular surface of the cylinder hole of the shell in a connector assembly mode. When the screw transmission unit generates axial force in the action process, the force feedback unit feeds the acquired force back to the ECU controller, and the ECU controller can improve the control accuracy of the brake system through the input force feedback.

The screw shaft is also provided with a cylindrical bearing, and the cylindrical bearing comprises an outer ring and an inner ring; the cylindrical bearing outer ring is arranged in a bearing mounting hole at the bottom of the shell in a press fit mode and is kept relatively fixed; the inner ring of the cylindrical bearing is matched with the screw shaft and synchronously rotates with the screw shaft; the cylindrical bearing is axially limited by a shell boss arranged on the shell.

The screw shaft is also provided with a limiting unit which restrains the axial displacement of the screw transmission unit; the limiting unit comprises a limiting gasket and a plane bearing, the plane bearing is installed between the end face of the shell and the limiting gasket, and the limiting gasket rotates together with the lead screw transmission unit through an inner hole of the gasket in interference fit with the lead screw shaft without generating axial displacement.

The utility model also provides an utilize above-mentioned electronic mechanical brake for vehicle to realize the method of vehicle braking, including following step:

step one, a motor in a gear box assembly supplies power through an electrical system interface to realize forward rotation, and a gear transmission system is driven to amplify torque;

rotating an inner hole spline of an output shaft of the gear transmission system, meshing the inner hole spline with a lead screw spline, and driving the lead screw to rotate through a lead screw shaft;

rotating the screw rod, wherein the screw nut does not rotate, the screw rod converts the torque of the transmission system of the gearbox into axial thrust along a cylinder hole of the shell, and the screw rod is tightly attached to a piston gasket of the screw nut to generate positive pressure on the end face of the bottom of the cylinder hole of the shell;

fourthly, the nut generates displacement towards the direction of the friction plate along the cylinder hole of the shell under the thrust of the screw rod;

fifthly, continuously increasing the displacement and the force of the screw nut under the action of a gear transmission system, and enabling the friction plate to press the brake disc to generate pressure required by braking, so as to realize a braking function;

step six, after braking is finished, electrifying, reversely rotating the motor and driving the re-driving gear transmission system;

seventhly, the screw rod rotates reversely to drive the screw nut to move towards the interior of the cylinder hole of the shell and to be far away from the friction plate;

step eight, releasing the force acting on the friction plate, and ending the braking.

The utility model discloses the beneficial effect that can obtain:

1. the whole vehicle brake system architecture is simplified;

2. the brake is electrically controlled, and a foundation is provided for automatic driving and the like;

3. the braking efficiency is improved;

4. the energy loss caused by vehicle dragging is reduced, and the vehicle endurance is improved.

Drawings

Fig. 1 is a schematic structural diagram of a hydraulic caliper on the market at present.

Fig. 2 is a schematic view of a three-dimensional structure of the electromechanical brake for a vehicle according to the present invention.

Fig. 3 is a side view of the electromechanical brake for a vehicle according to the present invention.

Fig. 4 is an axial side sectional view of the electromechanical brake for a vehicle according to the present invention.

Fig. 5 is a schematic perspective view of the driving structure mounting surface of the electromechanical brake for a vehicle according to the present invention.

Fig. 6 is an enlarged cross-sectional view of the driving structure of the electromechanical brake for a vehicle according to the present invention.

Fig. 7 is a perspective view of the transmission structure of the electromechanical brake screw for vehicle according to the present invention.

Fig. 8 is an axial side sectional view of the electromechanical brake screw drive structure for a vehicle according to the present invention.

In FIGS. 1-8, 100-brake, 110-gearbox assembly, 111-mount interface, 113-motor groove, 114-gearbox housing, 115-electrical system interface, 116-gear train, 117-female spline, 120-bracket assembly, 121-outer friction plate, 122-inner friction plate, 123-bracket, 124-guide pin, 130-housing, 131-housing bottom mounting surface, 133-housing cylinder hole, 134-second seal ring, 135-second seal groove, 136-housing anti-rotation groove, 137-bearing mounting hole, 138-housing boss, 139-housing end face, 140-housing mounting bolt, 150-gearbox mounting bolt, 160-lead screw drive unit, 161-screw spline, 162-screw shaft, 163-screw gasket, 164-screw, 165-nut, 165.1-nut inner cavity, 165.2-nut end face, 166-nut piston gasket, 166.1-mounting outer ring, 166.2-first sealing groove, 166.3-rotation stopping groove, 166.4-gasket force-bearing end face, 166.5-friction plate interface characteristic, 166.6-gasket outer contour, 166.7 first sealing ring, 169-thrust bearing, 170-force feedback unit, 171-outer gasket, 172-inner gasket, 173-force sensor, 210-limit unit, 211-limit gasket, 212-plane bearing, 213-gasket inner hole, 230-cylindrical bearing, 231-outer ring and 232-inner ring.

Detailed Description

The present invention will be described in further detail with reference to the following specific examples and the accompanying drawings. The procedures, conditions, experimental methods and the like for carrying out the present invention are general knowledge and common general knowledge in the art except for the contents specifically mentioned below, and the present invention is not particularly limited.

Electromechanical brake as shown in fig. 2, electromechanical brake 100 contains, gear box assembly 110, casing 130, bracket component 120, lead screw drive unit 160, force feedback unit 170, still including mounting bolt 150, casing mounting bolt 140 etc. that are used for installing the gear box.

The gearbox assembly 110 comprises a motor and a related gear transmission system 116, and the gearbox assembly 110 is further provided with a motor groove 113, an electrical system interface 115, a gearbox box 114 and the like; the gear box assembly 110 shown in fig. 2 is mounted on the corresponding bottom mounting surface 131 of the housing 130 via the mounting interface 111 by the gear box mounting bolts 150, and during operation, the torque required for braking is generated by the gear transmission system 116 driven by the motor and transmitted to the lead screw transmission unit 160 mounted in the housing 130. As shown in fig. 2, the motor in the gearbox assembly 110 is installed in the motor groove 113, and is typically characterized in that the axis of the motor groove 113 is parallel to the axis of the housing cylinder hole 133, wherein the housing cylinder hole 133 is used for installing a transmission system such as a lead screw transmission unit 160; the gear box assembly 110 and the housing 130 remain fixed relative to each other during operation and do not move relative to each other. The gearbox electrical system interface 115 is used for supplying power to a transmission motor and the like and providing electrical signals required for motor control and the like; the typical electrical system interface 115 is arranged in parallel with the motor shaft, as is the same electrical system interface parallel with the housing cylinder bore 133.

As shown in fig. 3, the electromechanical brake of the present invention comprises a bracket assembly 120 required by a conventional brake system to realize braking, and a typical bracket assembly comprises a bracket 123, an inner friction plate 122 and an outer friction plate 121, a guide pin 124 for mounting a housing 130, etc. during braking, the inner and outer friction plates move in opposite directions to clamp a brake disc, thereby generating a braking torque of a vehicle.

The gear transmission system 116 is mounted on the housing bottom mounting surface 131, the gear transmission system 116 and the housing cylinder hole 133 are coaxially arranged, the gear box output shaft is provided with an inner hole spline 117, and the gear transmission system 116 transmits torque to the lead screw transmission unit 160 through the engagement of the inner hole spline 117 and the lead screw spline 161.

As shown in fig. 6, the lead screw transmission unit 160 includes a lead screw 164 and a nut 165, which function to convert a torque into an axial thrust; the screw drive unit 160 is mounted inside the housing cylinder hole 133 and is arranged coaxially with the cylinder hole. A lead screw washer 163 mounted on the lead screw 164 rotates together with the lead screw 164 and bears an axial reverse force generated by the nut 165 during operation; a nut piston washer 166 is mounted on the end of the nut, and the screw 164 applies an axial force uniformly to the inner friction plate 122 via the nut piston washer 166, thereby generating an axial force required for braking. A force feedback unit 170 is also mounted on the lead screw, wherein the force feedback unit includes planar shims 171 and 172.

As shown in fig. 8, the cylindrical bearing 230 is mounted on the screw shaft 162, the cylindrical bearing 230 includes an inner ring 232 and an outer ring 231, wherein the outer ring 231 of the cylindrical bearing is press-fitted into the bearing mounting hole 137 at the bottom of the housing 130, and the outer ring 231 and the housing 130 are relatively fixed and do not displace during operation. The inner ring 232 is matched with the screw shaft 162, and the inner ring 232 and the screw shaft 162 synchronously rotate in the transmission process; the advantage of using cylindrical bearings 230 is to precisely position the lead screw through the bearings and to improve the efficiency of the transmission and reduce fatigue and other problems caused by friction. A housing boss 138 is disposed on the housing 130 for axially limiting the cylindrical bearing against undesired displacement.

The force feedback unit 170 is sequentially installed behind the cylindrical bearing 230 and positioned by the screw shaft 162, the screw shaft 162 and the force feedback unit 170 are in clearance fit, and the force feedback unit 170 does not rotate in the transmission process; the force feedback unit 170 comprises an inner pad 172, an outer pad 171, and a diaphragm force sensor 173 arranged between the two pads; the middle of the diaphragm type force sensor 173 is provided with a hole and is positioned and installed through a screw shaft 162; the advantage of using the diaphragm force sensor 173 is that the sensor is relatively thin, which can substantially reduce the axial length of the system and increase the utilization of the space volume. The inner and outer gaskets are matched with the sensor 173 through end faces, in the transmission process, the screw 164 rotates to generate axial thrust on the screw gasket 163, the screw gasket 163 drives a thrust bearing 169 arranged between the screw gasket 163 and the force feedback unit 170 to rotate, the axial thrust acts on the inner gasket 172, so that bearing positive pressure is generated on the diaphragm type force sensor 173, the generated pressure is converted into an electric signal through the diaphragm type force sensor 173 and is output by an output terminal 180 arranged on the shell cylinder hole 133, and the electric signal is used as a system signal after being output for auxiliary judgment. Where output terminals 180 are in the form of connectors mounted on the face of the outer circumference of housing cylinder bore 133, the more typical connector axis is perpendicular to the cylinder bore axis. Thrust bearing 169 and interior gasket 172 cooperate and rotate on interior gasket 172 terminal surface, and gasket 172 can produce the trend of rotation under the effect of rotational friction force, the utility model discloses interior gasket 172 cooperates with the rotation that prevents interior gasket 172 in the transmission process through the spline characteristic 172.1 of arranging in gasket one end and the spline groove 136 that is located the casing.

As shown in fig. 7, the nut 165 rotates and produces an axial displacement along the lead screw 164, the nut 165 is of a hollow nature in which a nut cavity 165.1 and a nut end surface 165.2 are disposed, and the axial thrust produced by the nut 165 is transmitted to the inner friction plate 122 by a nut piston washer 166 mounted on the nut end surface 165.2. As shown in fig. 3, the nut piston washer 166 and the inner friction plate 122 are cooperatively installed, and when an axial force generated by the transmission system is applied, the nut 165 is pushed to generate an axial displacement, and the force is transmitted downwards through the nut piston washer 166, and the nut piston washer 166 is displaced and attached to the inner friction plate 122, so that a positive pressure required for braking is generated. The nut piston gasket 166 is provided with an installation excircle 166.1, a first sealing groove 166.2 and a gasket stress end surface 166.4; the mounting excircle 166.1 is matched with a nut inner cavity 165.1 on the nut 165 in a press fit mode and is kept fixed; the gasket force-bearing end surface 166.4 is abutted against the nut end surface 165.2, and the axial force generated by the nut 165 is transmitted through the gasket force-bearing end surface 166.4. The nut piston washer 166 comprises a friction plate interface feature 166.5 and a washer outer contour 166.6, and the typical washer outer contour 166.6 is larger than the outer diameter of the nut 165, can be round or in any other shape, so that the contact of the friction plate action surfaces can be maximized, the contact precision is improved, and the system problem caused by large pressure due to small contact area is effectively avoided. At the same time, a rotation stopping groove 166.3 is arranged on the nut piston gasket 166, and the function of the rotation stopping groove is to prevent the nut 165 from generating rotation movement.

As shown in fig. 5, the screw shaft 162 is provided with a limiting unit 210, the screw 164 rotates forward to generate an axial thrust to realize a driving braking function, when braking is completed, the generated axial displacement of the nut 165 is released through the reverse rotation of the screw 164, and the reverse rotation process of the screw 164 generates a tendency of moving towards a friction plate under the mutual action, which is unfavorable for the function of releasing braking, so that a constraint is required to be added to the axial displacement of the screw. The spacing unit 210 includes a spacing washer 211 and a plane bearing 212; the plane bearing 212 is arranged between the end face 139 of the shell and the limiting gasket 211, the limiting gasket is arranged in an interference fit mode with the screw shaft 162 through the inner hole 213 of the gasket, and rotates together with the screw 164 in the working process without generating axial displacement; the flat bearing 212 functions as a good lubrication in the stationary housing end 139 and the spacing washer 211 to avoid potential failures such as wear.

The utility model discloses a typical characterized in that:

1. the electromechanical brake comprises a bracket unit, a shell, a gear box assembly, a lead screw transmission unit, a force feedback component and the like.

2. The gear box assembly is arranged at the end part of the shell, wherein the axis of the driving motor is parallel to the cylinder hole of the shell and the screw rod transmission unit; the gear transmission system and the lead screw are coaxially arranged. An electrical system interface is arranged on the gear box assembly, and the electrical system interface and the shell cylinder hole are arranged in parallel.

3. The lead screw adopts the form of a solid external spline to be matched with the spline of an output inner hole of the gear box

4. A force feedback unit which is coaxial with the screw rod and the cylinder hole is arranged in the cylinder hole of the shell, wherein a diaphragm type force sensor is typically adopted, the middle of the sensor is provided with a hole, and the sensor penetrates through the screw rod shaft to be installed and positioned; the force feedback assembly comprises an inner gasket and an outer gasket, the inner gasket is provided with a rotation stopping feature, and the rotation stopping feature and a shell boss on the shell are matched to meet the rotation stopping function

5. The force feedback unit is output through a connector mounted on a cylinder hole of the housing, the connector is arranged on the outer circumferential surface of the cylinder hole and is perpendicular to the axial direction of the housing and the axial direction of the screw rod

6. The end part of the screw unit is provided with a screw piston gasket, the outline characteristic of the piston gasket is larger than the external diameter of the screw nut, and the outline characteristic can be round or any other shape for matching with the friction plate

7. The end part of the screw rod is provided with a limiting gasket and a plane bearing which are coaxially arranged, and the limiting gasket is tightly matched with the screw rod shaft and rotates together with the screw rod shaft

The protection of the present invention is not limited to the above embodiments. Variations and advantages that may occur to those skilled in the art may be incorporated into the present invention without departing from the spirit and scope of the inventive concept, which is set forth in the following claims.

Claims (8)

1. An electromechanical brake for a vehicle, characterized in that the brake (100) comprises a gearbox assembly (110), a bracket assembly (120), a housing (130), a lead screw transmission unit (160), a force feedback unit (170);

the gearbox assembly (110) comprises a motor, a motor groove (113), a gearbox body (114), an electrical system interface (115) and a gear transmission system (116);

the bracket component (120) comprises an outer friction plate (121), an inner friction plate (122), a bracket (123) and a guide pin (124);

the housing (130) comprises a bottom mounting surface (131), a housing cylinder hole (133), a housing anti-rotation groove (136) and a housing boss (138);

the screw transmission unit (160) comprises a screw spline (161), a screw shaft (162), a screw gasket (163), a screw (164), a nut (165), a nut piston gasket (166) and a thrust bearing (169); the structure of the nut (165) comprises a nut inner cavity (165.1) and a nut end surface (165.2); the nut piston gasket (166) structurally comprises a mounting outer circle (166.1), a first seal groove (166.2), a rotation stopping groove (166.3), a gasket force-bearing end face (166.4), a friction plate interface feature (166.5) and a gasket outer contour (166.6);

the force feedback unit (170) comprises an outer pad (171), an inner pad (172), and a force sensor (173).

2. The brake of claim 1, wherein the gear box assembly (110) is attached to the bottom mounting surface (131) of the housing (130) at the corresponding position through a gear box mounting bolt (150) via a mounting interface (111) penetrating from two sides of the gear box assembly (110); a gear drive train (116) in the gearbox assembly (110) and a housing cylinder bore (133) are coaxially arranged; the motor is mounted in a motor groove (113), and the axis of the motor groove (113) is parallel to the axis of the housing cylinder hole (133); the electrical system interface (115) is located on the gearbox assembly (110) with its axis parallel or perpendicular to the housing cylinder bore (133) axis; the gear transmission system (116) is positioned in the gearbox body (114), an output shaft of the gear transmission system is provided with an inner hole spline (117), and the inner hole spline is meshed with a lead screw spline (161) to transmit output torque.

3. The brake as claimed in claim 1, characterized in that the outer friction plates (121) and the inner friction plates (122) are mounted on both sides of a U-shaped space in a carrier (123), respectively; the housing (130) is mounted on the bracket assembly (120) by a housing mounting bolt (140) and the guide pin (124).

4. The brake of claim 1, characterized in that the spindle drive unit (160) is mounted inside a housing cylinder bore (133) and is arranged coaxially with the housing cylinder bore (133); a screw gasket (163) is arranged on the screw (164); the nut piston gasket (166) is arranged at the end part of the nut (165) far away from the gear box assembly (110) and uniformly applies axial acting force to the inner friction plate (122); the mounting excircle (166.1) is matched with a nut inner cavity (165.1) on the nut (165) in a press-fit mode and is kept fixed; the gasket stressed end face (166.4) is attached to the nut end face (165.2) to transmit the axial force generated by the nut (165); the first sealing groove (166.2) is positioned on an installation excircle (166.1) of the nut piston gasket (166) in a groove mode and is matched with a nut inner cavity (165.1), and a first sealing ring (166.7) is utilized to realize the sealing effect between the nut piston gasket (166) and the nut (165); the anti-rotation groove (166.3) is used for preventing the nut (165) from generating rotation movement; the friction plate interface feature (166.5) is cooperatively mounted with the inner friction plate (122); the diameter of the gasket outer contour (166.6) is larger than the outer diameter of the screw nut (165); the thrust bearing (169) is arranged between the screw rod gasket (163) and the force feedback unit (170); and a second sealing ring (134) is arranged in a second sealing groove (135) corresponding to the shell (130) and is matched with the outer ring of the screw nut (165) to realize sealing between the shell (130) and the screw nut (165).

5. The brake of claim 1, characterized in that the force feedback unit (170) is mounted inside the housing cylinder bore (133) for outputting the axial force generated by the lead screw transmission unit (160).

6. The brake of claim 1, characterized in that the force feedback unit (170) is centrally apertured and mounted on a threaded shaft (162), the outer pad (171) and the inner pad (172) being planar pads; an L-shaped rotation stopping feature (172.1) is arranged on the inner gasket (172) at a position far away from the screw shaft (162) and is matched with a rotation stopping groove (136) on the shell to prevent the inner gasket (172) from rotating in the transmission process; in transmission, pressure generated by a screw transmission unit (160) is output from an output terminal (180) mounted on a housing cylinder hole (133) through a force sensor (173); the output terminal (180) is mounted on the outer circumferential surface of the housing cylinder hole (133) in the form of a connector.

7. The brake of claim 1, characterized in that a cylindrical bearing (230) is further mounted on the screw shaft (162), the cylindrical bearing (230) comprising an outer ring (231) and an inner ring (232); the cylindrical bearing outer ring (231) is arranged in a bearing mounting hole (137) at the bottom of the shell (130) in a press-fit mode and is kept relatively fixed; the cylindrical bearing inner ring (232) is matched with the screw shaft (162) and synchronously rotates with the screw shaft (162); the cylindrical bearing (230) is axially limited by a housing boss (138) arranged on the housing (130).

8. The brake of claim 1, wherein the lead screw shaft (162) is further provided with a limiting unit (210) for limiting the axial displacement of the lead screw transmission unit (160); the limiting unit (210) comprises a limiting gasket (211) and a plane bearing (212), the plane bearing (212) is installed between the end face (139) of the shell and the limiting gasket (211), the limiting gasket (211) is in interference fit with the screw shaft (162) through a gasket inner hole (213) and rotates together with the screw transmission unit (160), and axial displacement is not generated.

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