CN223648390U - A dual-cylinder EPB electronic parking brake - Google Patents

Abstract

This utility model discloses a dual-cylinder EPB electronic parking brake, which includes: a drive mechanism assembly, a housing assembly, a transmission mechanism assembly, a friction pad assembly, and a bracket assembly. The drive mechanism assembly includes a motor and a reduction gearbox, and outputs motor torque through two output ends. The housing assembly serves as the external structure of the brake, housing and fixing the internal mechanical components. The transmission mechanism assembly includes two transmission mechanisms, which respectively convert the motor torque output from the two output ends of the drive mechanism assembly into axial motion to drive the piston. The friction pad assembly includes inner and outer friction pad assemblies, which clamp the brake disc under the drive of the piston. The bracket assembly is connected to the housing assembly by bolts, fixing and supporting the brake, and guiding and restricting the path movement of the piston and friction pads during braking.

Description

Double-cylinder EPB electronic parking brake

Technical Field

The utility model belongs to the technical field of automobile brake devices, and relates to a double-cylinder EPB electronic parking brake.

Background

The electronic parking brake is an important component applied to a vehicle braking system, and along with the increasing popularization of vehicle electric operation, the whole weight of an electric car becomes larger, so that the requirement on parking force becomes higher, the original electronic parking brake system mainly adopts a single transmission mechanism structure, the requirement on large parking force cannot be met, and particularly, the effect is poor when the electronic parking brake system is applied to a large-load vehicle. And the double transmission mechanism can meet the requirement of large parking force. The electronic parking brake calipers at the present stage are all of single-piston design, and are suitable for vehicle types with larger load, and the double-piston rear electronic calipers are newly pushed out. The most similar solution to the present utility model is the single piston electronic caliper.

The single-piston electronic caliper in the prior art has various defects, the traditional single-piston electronic caliper cannot provide ultra-large braking force to meet the braking requirement of a heavy-load vehicle, meanwhile, because the center distance space between a motor and the caliper is limited, the motor cannot be distributed and designed, ultra-large parking force cannot be provided to meet the parking requirement of the heavy-load vehicle, in addition, the friction plate designed by the single piston has the problems of uneven abrasion, eccentric wear and the like to influence the braking performance and the safety, the double-caliper with large braking force can provide larger braking force, but has the advantages of large weight, more consumption materials and high cost, so that the efficiency and the economy are relatively low, and meanwhile, the service lives of the bearing, the gasket and the adjusting component in the prior art are short, frequent replacement and maintenance are required, and the use cost and the maintenance difficulty are increased.

Disclosure of utility model

In order to solve the defects in the prior art, the utility model aims to provide a double-cylinder EPB electronic parking brake, which belongs to rear wheel brakes and adopts double pistons for parking and parking.

The utility model provides a double-cylinder electronic parking brake, which comprises a driving mechanism assembly, a shell assembly, a transmission mechanism assembly, a friction plate assembly and a bracket assembly, wherein the driving mechanism assembly is arranged on the shell assembly;

The driving mechanism assembly is fixedly arranged on the shell assembly and mainly comprises a motor, a reduction gear box and other parts, and is provided with two symmetrical output ends. In the utility model, the driving mechanism assembly adopts a single motor as a driving source, and the motor starts and outputs torque under the set current and voltage conditions. The torque is amplified by the reduction gearbox, then transmitted to the output shaft through two symmetrical output paths, and the transmission mechanism assembly is driven by a transmission chain or a direct coupling mode;

The shell assembly is a main external structure of the whole brake, two parallel shell cylinder holes are formed in the shell assembly, so that internal mechanical components can be accommodated and fixed, and the brake system can work normally and reliably in the running and parking processes of the vehicle;

The transmission mechanism assembly comprises two groups of transmission mechanisms which are identical and are arranged in parallel, wherein the two groups of transmission mechanisms are respectively arranged in two shell cylinder holes of the shell assembly, the transmission mechanisms ensure that the rotation motion of a motor is effectively converted into axial thrust under the control of the drive mechanism assembly through the mutual cooperation and work between the components, so that the piston motion is pushed to realize accurate driving and parking braking functions;

the transmission mechanism comprises a copper sleeve, an O-shaped sealing ring, an upper gasket, a thrust bearing, a lower gasket, an adjusting bolt, an adjusting nut, a piston, a rectangular sealing ring and a piston dust cover;

The adjusting bolt is mainly matched with the adjusting nut to convert torque output by the motor in the driving mechanism assembly into axial output to drive the piston to push the friction plate to achieve a corresponding braking function, and the adjusting bolt and the adjusting nut transfer motion through threads to convert rotary motion output by the motor into axial motion of the piston.

The adjusting bolt is provided with a bolt base, one end of the adjusting bolt is provided with a spline feature, a copper sleeve, an O-shaped sealing ring, an upper gasket, a thrust bearing and a lower gasket are sleeved and installed on the bolt base in sequence along the spline feature, and after the sleeved and installed state, the upper end of the copper sleeve does not exceed the lower edge of the spline feature, so that the spline feature can be firmly meshed with a spline at the output end of the driving mechanism assembly;

The inner part of the piston is of a hollow structure, the adjusting nut is inserted into the inner space of the piston, and a concave hemisphere matched with the hemispherical shape of the end part of the adjusting nut is processed at the bottom of the inner part of the piston;

When the adjusting bolt rotates in the copper sleeve, compared with the direct contact of the shaft and the ductile iron shell, the copper sleeve can reduce friction;

the O-shaped sealing ring is used for sealing the top, so that brake fluid is prevented from leaking;

the upper gasket is matched with the thrust bearing and has the functions of adjusting the gap, uniformly distributing the load, preventing leakage and buffering protection;

the thrust bearing reduces friction, bears radial load and provides high bearing capacity;

the size, the material, the action and the like of the lower gasket are consistent with those of the upper gasket;

The rectangular sealing ring is made of rubber, and can play a role in sealing and returning;

The piston dust cover is made of rubber, and can play a role in water and dust prevention.

The friction plate assembly comprises an inner silencing plate, an inner backboard, an inner friction plate, an outer backboard and an outer silencing plate;

The inner silencing plate, the inner back plate and the inner friction plate jointly form an inner friction plate assembly, and the outer silencing plate, the outer back plate and the outer friction plate jointly form an outer friction plate assembly;

The inner silencer sheet, the inner backboard, the inner friction sheet or the outer silencer sheet, the outer backboard and the outer friction sheet are connected and fixed through the protrusions arranged on the structure and through holes matched with the protrusions in size and shape.

The inner back plate or the outer back plate is respectively positioned at the back surfaces of the inner friction plate and the outer friction plate, provides a supporting structure for the friction plate, ensures that the friction material cannot deform in the braking process and simultaneously uniformly transmits braking force to the friction plate, and is respectively attached to the inner back plate and the outer back plate for absorbing and reducing noise and vibration generated in the braking process and improving the braking comfort;

In a specific embodiment, the lower part of the inner silencing sheet or the outer silencing sheet is provided with an extending part exceeding the friction sheet, and the extending part reversely wraps the friction sheet to fix the silencing sheet, the backboard and the friction sheet in a clamping way;

The friction plate assembly is in contact connection with the bracket through the silencing plate, so that the friction plate is ensured to be stable and motionless in the brake, and meanwhile, the friction plate assembly can be quickly installed or replaced, and the maintenance process is simplified.

The support assembly is connected with the shell assembly through bolts, the brake is fixed and supported, the guide piston and the friction plate move along a correct path in the braking process, unnecessary movement of the brake is limited, the guide function provided by the support assembly and the two driving mechanisms arranged in parallel in the shell assembly ensure that the contact area between the driving mechanisms and the friction plate assembly is larger than that of a common single-cylinder brake, the contact area between the friction plate assembly and a brake disc is maximized as much as possible, the braking efficiency is improved, and uneven wear of the eccentric wear and the friction plate is reduced.

The utility model also provides a method for braking by using the double-cylinder electronic parking brake, which comprises the following steps:

Step one, starting a braking instruction

The driver presses the brake pedal or presses the park button, and an Electronic Control Unit (ECU) receives an instruction to start braking.

Step two, generating braking force

And the service braking is that the hydraulic system generates pressure to push the piston to move outwards, and the friction plate and the brake disc are clamped to realize deceleration or parking.

And the motor drives the adjusting bolt to rotate to push the piston to move outwards to clamp the friction plate and the brake disc, so that the parking brake is realized.

Step three, maintaining the braking state

Service braking is kept, namely the hydraulic system keeps pressure continuously, and braking is kept.

The parking brake is kept, namely, an adjusting bolt and a nut are locked, and a friction plate is kept to clamp a brake disc.

Step four, releasing the brake

The driver releases the brake or releases the parking instruction, the piston is retracted, the friction plate releases the brake disc, and the brake is released.

Step five, resetting the system

All parts are restored to the original position ready for the next braking.

The double-cylinder electronic parking brake has the advantages that the double-cylinder electronic parking brake can provide larger rear wheel braking force, compared with a single-cylinder product in the prior art, the braking force performance is improved by 100%, the double-driving mechanism can provide larger parking force, the existing brake can provide 18000N parking force at maximum, the scheme of the double-cylinder electronic parking brake can provide 28000N parking force, the contact area between the friction plate assembly and the brake disc is larger, the contact is more stable, the service life of the friction plate is prolonged, the eccentric wear problem of the friction plate is obviously improved, the radial eccentric wear can be improved from the existing 5 mu m to 1.5 mu m, the tangential eccentric wear can be improved from the existing 3 mu m to 0.5 mu m, in addition, different mechanisms in the double-cylinder electronic parking brake are mutually matched, the service life of the transmission mechanism is prolonged, and the durability is improved by 20%.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view showing the overall perspective structure of the brake of the present utility model.

Fig. 2 is an exploded view of the overall structure of the brake of the present utility model.

Fig. 3 is an exploded view of the structure of the transmission mechanism of the present utility model.

FIG. 4 is an exploded view of the friction plate assembly of the present utility model.

FIG. 5 is a cross-sectional view of the brake of the present utility model taken at one of its angles and in the direction A-A.

In the figure, the device comprises a 1-driving mechanism assembly, a 2-shell assembly, a 3-driving mechanism assembly, a 3.1-copper sleeve, a 3.2-O-shaped sealing ring, a 3.3-upper gasket, a 3.4-thrust bearing, a 3.5-lower gasket, a 3.6-adjusting bolt, a 3.7-adjusting nut, a 3.8-piston, a 3.9-rectangular sealing ring, a 3.10-piston dust cover, a 4-friction plate assembly, a 4.1-inner silencing plate, a 4.2-inner back plate, a 4.3-inner friction plate, a 4.4-outer friction plate, a 4.5-outer back plate, a 4.6-outer silencing plate and a 5-bracket assembly.

Detailed Description

The utility model will be described in further detail with reference to the following specific examples and drawings. The procedures, conditions, experimental methods, etc. for carrying out the present utility model are common knowledge and common knowledge in the art, except for the following specific references, and the present utility model is not particularly limited.

The utility model designs a novel double-cylinder electronic parking brake with a double-piston structure for solving the problems of insufficient braking force, insufficient parking force, eccentric wear of a friction plate and the like of the traditional electronic parking calipers. The double-cylinder electronic parking brake disclosed by the utility model, as shown in figures 1-2, comprises a driving mechanism assembly 1 (a double-output-shaft parking driving mechanism), a shell assembly 2 (a double-cylinder shell), a transmission mechanism assembly 3 (comprising a double piston and a double transmission mechanism), a bracket assembly 5 (a bracket), a friction plate assembly 4 (comprising a friction plate) and the like.

From the braking force angle, when double-cylinder callipers are braked, the double pistons are pushed to press the friction plates through the electrically driven driving mechanism, the friction plates clamp the brake disc to realize deceleration parking, and when the double pistons work cooperatively, larger pressure intensity and more uniform force distribution can be provided. The friction disc area of double-cylinder callipers is bigger, and the working area who laminates with the brake disc is big, compares in single piston calliper after, and double-cylinder calliper provides stronger brake dynamics and stability.

From parking force and part life-span angle, double drive mechanism's design, including double adjusting bolt, double adjusting nut, duplex bearing and gasket etc. when the vehicle parks, output moment of torsion from double output shaft parking actuating mechanism, drive double adjusting bolt and rotate and compress tightly duplex bearing and gasket, adjusting bolt axial displacement, compress tightly double piston and push to the friction disc, inside and outside friction disc presss from both sides tight brake disc and realizes the parking, can provide bigger braking force and parking force under limited space, the parking force is influenced by actuating mechanism performance, the motor axis is fixed with the distance of piston axis, need guarantee the wall thickness of calliper casing, need guarantee the wall thickness of motor casing, need guarantee the clearance of motor casing and calliper casing simultaneously, so only can be for double-cylinder EPB can satisfy big parking force and big braking force's demand simultaneously. Compared with a single-cylinder caliper, the scheme can meet the requirement of large parking force, the output torque is larger, the single-cylinder caliper generally provides 18000N parking force, and the double-cylinder caliper can provide 28000N parking force. While providing big parking power, because the moment of torsion of single motor output is shunted by two drive mechanism in the parking actuating mechanism, to the inside gear of parking mechanism and the inside drive mechanism wearing and tearing of calliper alleviate, can improve the life of part.

From the abrasion angle of the friction plate, the single-cylinder caliper is arranged in the middle of the piston, the piston can only press the center area of the friction plate, and after the vehicle is used for a period of time, the problem of eccentric abrasion of the friction plate can occur. According to the utility model, the double pistons are designed to be in contact with the friction plate, two sides of the pistons are opposite, the pressure distribution of the friction plate is uniform by combining CAE simulation data, the eccentric wear of the screw-in and screw-out ends, the radial and tangential directions can be obviously improved, in the specific implementation process, the closer the center of mass of the friction plate is to the center line of the piston, the better the closer the center of mass is, and in one specific implementation, the distance between the center of mass and the center of mass of the friction plate is less than 0.5mm.

The problems to be solved by the utility model include the following:

1. the double piston design provides greater braking force;

2. The double-piston design is internally provided with a double transmission mechanism, so that larger parking force is provided;

3. The double-piston design has larger contact surface with the friction plate, the pressure distribution between the friction plate and the brake disc is uniform, and the problem of eccentric wear of the friction plate is solved;

4. aiming at the requirement of large braking force, the double-cylinder single-caliper design is lighter in weight and low in cost.

5. The double transmission mechanism, the double bearings, the gaskets and the adjusting component reduce the abrasion to parts during parking and improve the service life of the parts.

The double-cylinder electronic parking brake is shown in a structural schematic diagram in FIG. 2, and mainly comprises 5 parts, namely a driving mechanism assembly 1, a shell assembly 2, a transmission mechanism assembly 3, a bracket assembly 5 and a friction plate assembly 4.

As shown in FIG. 3, the transmission mechanism assembly 3 comprises a copper sleeve 3.1, an O-shaped sealing ring 3.2, an upper gasket 3.3, a thrust bearing 3.4, a lower gasket 3.5, an adjusting bolt 3.6, an adjusting nut 3.7, a piston 3.8, a rectangular sealing ring 3.9 and a piston dust cover 3.10. The working principle of the transmission mechanism assembly 3 is divided into two aspects, namely service braking and parking braking. Firstly, the shell is of double-cylinder design, the shell is made of QT500 material, brake fluid is pressed in two cavities to push the piston 3.8 to axially move, and the piston 3.8 and the claw of the shell clamp inner and outer friction plates to carry out service braking. Secondly, the parking brake caliper adopts a double-transmission mechanism design, during parking, torque output by a motor is transmitted to two output shaft ends through an internal gear of a driving device, the torque is transmitted to a transmission mechanism assembly 3, an adjusting bolt 3.6 in the transmission mechanism assembly 3 is pressed at the head of a shell, two gaskets (comprising an upper gasket 3.3 and a lower gasket 3.5) and a thrust bearing 3.4 are pressed in the middle, the adjusting bolt 3.6 is in threaded connection with the adjusting nut 3.7, the adjusting bolt 3.6 rotates and moves, the torque is output to the axis of the end of the adjusting nut 3.7 to move, the axis of a piston 3.8 is pushed to move, and the piston 3.8 and a claw clamp inner friction plate and the outer friction plate are clamped to carry out parking brake. The spline feature on the adjusting bolt 3.6 is matched with the spline of the output end of the driving mechanism assembly 1, so that the 100000 times of durability requirement of the large parking force 28000N can be met.

As shown in fig. 4, the friction plate assembly 4 is composed of an inner silencing plate 4.1, an inner back plate 4.2, an inner friction material 4.3, an outer friction material 4.4, an outer back plate 4.5 and an outer silencing plate 4.6.

According to the friction plate, through the size design, the mass center position of the friction plate assembly 4 is adjusted to be flush with the axis of the piston 3.8, and the friction plate is symmetrically placed, so that the contact surface between the piston 3.8 and the friction plate is larger, and the eccentric wear problem of the friction plate is obviously improved. The radial bias of the traditional single-cylinder electronic parking brake is 5 mu m, the tangential bias is 3 mu m, and the radial bias can be improved to the level of 1.5 mu m and the tangential bias of 0.5 mu m.

In one embodiment, the main functions of the housing assembly 2 include the following:

1) Supporting and securing internal components

The housing assembly 2 provides structural support and securement for the internal components of the parking brake, including the double piston, double drive mechanism (e.g., adjusting bolts and nuts), friction plate assembly, motor drive and reduction gearbox, and by providing a strong outer frame, the housing assembly 2 ensures that all internal components maintain their relative positions during operation and prevent them from shifting or loosening during braking.

2) Accommodating hydraulic system

The design of the housing assembly 2 includes an internal double cylinder cavity as the primary reservoir for the hydraulic system for containing brake fluid and transmitting hydraulic pressure, the hydraulic system transmitting hydraulic fluid through channels and chambers within the housing assembly. The double-cylinder structure in the shell allows hydraulic fluid to act on the two pistons simultaneously, so that the two pistons are pushed to move outwards to compress the friction plate, and service braking is achieved. The design of the shell assembly also ensures the tightness of hydraulic fluid, prevents leakage and keeps the stability and efficiency of the hydraulic system.

3) Protecting internal components

The housing assembly 2 protects the internal mechanical and hydraulic components from external environments (e.g., silt, rain, dust, chemicals, etc.) and physical impacts, and is typically made of a high strength material (e.g., cast iron, aluminum alloy, or steel) capable of withstanding external physical impacts and pressures, while providing corrosion and high temperature resistance. This protection prolongs the service life of the components of the brake and ensures proper operation of the brake in harsh environments.

4) Radiating function

During braking, a large amount of heat is generated between the friction plate and the brake disc, the shell assembly 2 can also help to quickly dissipate the heat to prevent the brake system from overheating, and the shell assembly 2 is usually designed with radiating fins or made of materials with good heat conduction performance, so that the heat generated during the operation of the internal components can be dissipated.

5) Force transmission and distribution

The shell assembly 2 is a key medium for transmitting braking force and parking force in the whole braking system, and the shell assembly 2 can uniformly distribute the force generated in the braking process to parts such as a friction plate, a piston, a transmission mechanism and the like through the internal structural design (such as a double-cylinder structure and a fixed bracket). Ensuring that each component is subjected to a pressure within its design range, thereby improving the efficiency and stability of the brake system.

6) Mounting and integration

The housing assembly 2 provides a mounting interface for securing the brake to the vehicle suspension system or axle, and by precise mounting hole location and bracket design, the housing assembly ensures that the brake can be securely mounted to the chassis or wheel support structure of the vehicle, maintaining its precise alignment relative to the brake disc.

In a specific embodiment, the adjusting bolt 3.6 in the transmission mechanism is used for converting the rotary motion of the motor into axial thrust and realizing the movement of the piston through the cooperation of the adjusting nut, the adjusting nut 3.7 and the adjusting bolt 3.6 realize axial displacement through the threaded cooperation through the rotary motion of the adjusting bolt 3.6 to push the piston 3.8 to move outwards, and the piston 3.8 is acted by the axial thrust of the adjusting nut 3.7 to push the friction plate to press the brake disc to realize braking.

The adjusting bolt 3.6 is connected with the output shaft of the reduction gear box, when the motor is driven, the adjusting bolt 3.6 rotates and drives the adjusting nut 3.7 to move along the threads of the adjusting nut, and the axial movement of the adjusting nut 3.7 generates thrust to the piston 3.8 to push the piston 3.8 to move outwards.

The adjusting nut 3.7 directly pushes the piston 3.8 through axial displacement, so that the piston 3.8 moves outwards to compress the friction plate, and braking force is generated;

In a specific use process, the transmission mechanism is used in the electronic parking brake in the following manner:

1. starting a braking process:

when an Electronic Control Unit (ECU) receives a braking command, the motor drive is started and the output torque is transmitted to the adjusting bolt 3.6 through the reduction gearbox. The adjusting bolt 3.6 rotates, and the threaded structure drives the adjusting nut 3.7 to axially move.

2. Generating axial thrust:

The axial movement of the adjusting nut 3.7 generates a thrust force pushing the piston 3.8 outwards. In this process, the thrust bearing 3.4 reduces friction between the adjusting bolt 3.6 and the adjusting nut 3.7, ensuring a smooth rotational movement.

3. Piston movement and braking force generation:

The piston 3.8 moves outwards under the action of the adjusting nut 3.7, and the inner friction plate and the outer friction plate are pressed to be in contact with the brake disc, so that friction force is generated, and the braking or parking function of the vehicle is realized.

4. Maintaining and releasing the braking state:

When the braking state reaches the preset parking force (28000N for example), the adjusting bolt 3.6 and the adjusting nut 3.7 stop moving, keep the mechanical locking state, ensure that the friction plate clamps the brake disc, and realize the parking braking.

When the braking is required to be released, the motor rotates reversely, the adjusting bolt 3.6 rotates reversely, the adjusting nut 3.7 moves reversely axially, the piston 3.8 retracts, the friction plate releases the brake disc, and the vehicle can move normally.

In one embodiment, the main functions of the bracket assembly 5 include the following:

1. Fixing and supporting brake

The main function of the bracket assembly 5 is to fix the brake on the suspension system or axle of the vehicle, ensuring that the brake and the brake disc maintain the correct relative positions;

The bracket assembly 5 provides a connection point to the vehicle mounting surface and is typically fixedly secured to the axle or suspension system by bolts or other fasteners. During the running of the vehicle, the bracket assembly bears the braking force and vibration from the brake, so that the bracket assembly has enough strength and rigidity to ensure that the brake does not displace or loosen.

2. Absorbing and dispersing braking forces

The bracket assembly 5 is responsible for absorbing and dispersing braking force and vibration generated in the braking process, reducing stress concentration in a braking system and protecting other parts

When the brake applies a braking force, a friction force generated between the brake disc and the friction plate is transmitted to the bracket assembly 5 through the caliper. The bracket assembly 5 must be able to effectively absorb these forces and evenly disperse them into the vehicle frame or suspension system to prevent fatigue damage caused by stress concentrations.

3. Guiding and limiting movement of piston and friction plate

The structural design of the carrier assembly 5 ensures that the piston 3.8 and the friction plate move along the correct path during braking and restricts unwanted movement thereof.

The bracket assembly 5 acts as a guide in the caliper ensuring that the piston 3.8 and friction plate move along the designed axis during braking and release without tilting or jamming. By providing a guiding function, the bracket assembly 5 can ensure that the contact surface between the friction plate and the brake disc is maximized, improve the braking efficiency, and reduce uneven wear of the friction plate and eccentric wear.

4. Providing mounting and positioning functions

The bracket assembly 5 provides mounting points and positioning functions for various components (such as the piston 3.8, friction plates and transmission mechanism) within the caliper, ensuring that these components function properly within the design envelope.

The mounting and positioning functions not only simplify the assembly and maintenance process of the brake, but also ensure the coordination work of all the components during braking, thereby improving the overall reliability and safety of the brake system.

5. Radiating function

The bracket assembly 5 helps to dissipate heat generated during braking, prevent overheating of the braking system, and maintain stability of braking performance.

During braking, a large amount of heat is generated by friction between the friction plate and the brake disc, and the bracket assembly 5 can help to rapidly emit the heat through material selection and design optimization, so that the braking performance is prevented from being reduced (such as heat fading phenomenon) due to heat accumulation.

The design of the bracket assembly 5 generally contemplates a heat sink or other heat dissipating structure to increase the heat dissipating area and air circulation to enhance heat dissipation efficiency.

6. Improving durability of a brake system

The bracket assembly 5 extends the service life of other components in the brake system through its structural design and material selection.

By providing stable support, guidance and positioning functions, the bracket assembly 5 reduces abnormal wear and fatigue damage to various components during braking, thereby improving the durability of the overall braking system.

The bracket assembly 5 is typically designed using high strength materials (e.g., alloy steel or aluminum alloys) that have good fatigue and corrosion resistance properties and are suitable for long term use under complex operating conditions of the vehicle.

In the description of the present utility model, it should be noted that, if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are used, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the indicated apparatus or element must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, or may be directly connected, or may be indirectly connected through an intermediate medium, or may be in communication with the interior of two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In addition, when an element is referred to as being "on" another element, it can be directly on the other element or be indirectly on the other element with one or more intervening elements interposed therebetween. In addition, when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element with one or more intervening elements interposed therebetween.

The protection of the present utility model is not limited to the above embodiments. Variations and advantages that would occur to one skilled in the art are included in the utility model without departing from the spirit and scope of the inventive concept, and the scope of the utility model is defined by the appended claims.

Claims (8)

1. The double-cylinder EPB electronic parking brake is characterized by comprising a driving mechanism assembly (1), a shell assembly (2), a transmission mechanism assembly (3), a friction plate assembly (4) and a bracket assembly (5);

The driving mechanism assembly (1) comprises a motor and a reduction gear box, and outputs motor torque through two output ends;

The housing assembly (2) acts as an external structure of the brake, housing and securing internal mechanical components;

The transmission mechanism assembly (3) comprises two transmission mechanisms, and the motor torques output by the two output ends of the driving mechanism assembly (1) are respectively converted into axial motions to drive the pistons to move;

The friction plate assembly (4) comprises an inner friction plate assembly and an outer friction plate assembly, and the brake disc is clamped under the drive of the piston;

the bracket assembly (5) is connected with the shell assembly (2) through bolts, fixes and supports the brake, and guides and limits the path movement of the piston and the friction plate in the braking process.

2. A brake according to claim 1, characterized in that the drive mechanism assembly (1) comprises a motor, symmetrically arranged output paths of the reduction gearbox, torque is amplified by the reduction gearbox, transmitted to the output shaft through two symmetrical output paths, and the drive mechanism assembly (3) is driven by a drive chain or by direct coupling.

3. Brake according to claim 1, characterized in that two housing cylinder bores are provided in the housing assembly (2), and/or,

The transmission mechanism assembly (3) comprises two groups of transmission mechanisms which are respectively arranged in two shell cylinder holes, wherein the transmission mechanisms comprise a copper sleeve (3.1), an O-shaped sealing ring (3.2), an upper gasket (3.3), a thrust bearing (3.4), a lower gasket (3.5), an adjusting bolt (3.6), an adjusting nut (3.7), a piston (3.8), a rectangular sealing ring (3.9) and a piston dust cover (3.10) and/or,

The friction plate assembly (4) comprises an inner silencing plate (4.1), an inner back plate (4.2), an inner friction plate (4.3), an outer friction plate (4.4), an outer back plate (4.5) and an outer silencing plate (4.6).

4. A brake according to claim 3, characterized in that the adjusting bolt (3.6) is matched with the adjusting nut (3.7) to convert the torque output by a motor in the driving mechanism assembly (1) into axial output so as to drive the piston (3.8) to push the friction plate to realize a braking function, and/or,

The adjusting bolt (3.6) is provided with a bolt base.

5. The brake according to claim 4, wherein a spline feature is arranged at one end of the adjusting bolt (3.6), a copper sleeve (3.1), an O-shaped sealing ring (3.2), an upper gasket (3.3), a thrust bearing (3.4) and a lower gasket (3.5) are sequentially sleeved and installed from the spline feature to the bolt base, and after the sleeve and the installation are completed, the upper end of the copper sleeve (3.1) does not exceed the lower edge of the spline feature, so that the spline feature can be firmly meshed with a spline at the output end of the driving mechanism assembly (1).

6. A brake according to claim 3, characterized in that the interior of the piston (3.8) is of a hollow structure, the adjusting nut (3.7) is inserted into the internal space of the piston (3.8), a concave hemisphere matched with the hemispherical shape of the end part of the adjusting nut (3.7) is processed at the bottom of the interior of the piston (3.8), a rectangular sealing ring (3.9) and a piston dust cover (3.10) are sleeved on the outer wall of the piston (3.8), and grooves matched with the rectangular sealing ring (3.9) and the piston dust cover (3.10) are formed at corresponding positions in the cylinder hole of the shell.

7. A brake according to claim 3, wherein the inner sound damping plate (4.1), the inner backing plate (4.2), the inner friction plate (4.3) together form an inner friction plate assembly, and the outer sound damping plate (4.6), the outer backing plate (4.5), the outer friction plate (4.4) together form an outer friction plate assembly.

8. A brake according to claim 3, characterized in that the connection and fixation between the structures is achieved between the inner sound damping plate (4.1), the inner back plate (4.2), the inner friction plate (4.3) or the outer sound damping plate (4.6), the outer back plate (4.5) and the outer friction plate (4.4) by means of structurally provided protrusions and through holes matching the size and shape of the protrusions.