CN118220094A - Integrated electric braking system and electric braking method - Google Patents

Abstract

The invention discloses an integrated electric brake system and an electric brake method, which relate to the field of brake systems and comprise a brake rod body, a push rod, a parking spring, a cover plate, a nut, a motor assembly and a controller; the cover plate is arranged at the tail part of the brake rod body; the ejector rod is movably arranged in the inner cavity of the brake rod body, the ejector rod is provided with an ejector rod head and an ejector rod tail, the ejector rod head penetrates out of the head of the brake rod body, the ejector rod tail penetrates through the cover plate and penetrates out of the tail of the brake rod body, and the ejector rod tail is provided with a screw rod structure; the parking spring is compressed between the ejector rod and the cover plate; the rotor of the motor assembly comprises a rotor output end, a nut is fixedly connected to the rotor output end, and the interior of the nut is matched with a screw rod structure at the tail part of the ejector rod; the motor assembly is connected with the controller. The invention has the advantages that: the service braking function and the parking braking function are integrated in the brake rod body, so that the safety requirements of functions are met, and a hydraulic oil way is not needed.

Description

Integrated electric braking system and electric braking method

Technical Field

The invention relates to the field of braking systems, in particular to an integrated electric braking system and an electric braking method.

Background

For a braking system of a forklift, a forklift of an internal combustion forklift or an electric single motor drive axle basically adopts a brake drum; the biggest disadvantage of drum brakes is poor heat dissipation, and since the brake system is enclosed in the brake drum, the heat generated by friction cannot be rapidly dissipated after continuous braking. The contact surface of the brake drum with the brake pad becomes small after thermal expansion, thereby affecting braking efficiency.

For electric forklifts, especially for dual motor drive axles, the current braking systems basically use the braking form of wet friction plates to achieve both service and parking braking functions, for example, a modular brake lever structure is disclosed in the patent document CN218510053U, and for the braking function of wet friction plate brakes, there are various implementations.

Mode one: as shown in fig. 1, in a conventional brake lever of a forklift truck, a friction plate is installed inside a reduction gearbox of a drive axle, and a brake lever 1 is installed at one side of the reduction gearbox, and the brake lever 1 is designed in a lever form and connects an oil pipe 2 and a cable 3. When the brake pedal is stepped on, brake oil with certain pressure is conveyed into the inner cavity 4 of the brake rod 1, the piston 6 in the brake rod 1 pushes the ejector pin 7 to prop against the drive axle reduction gearbox shell 8, the brake rod 1 pushes the brake pin 5 under the action of the lever, and then the pressure plate is pushed to combine the friction plate with the dual steel plate, so that service braking is realized. When parking is needed, the driver pulls up the hand brake, and the hand brake is the same as the service brake, drives the stay rope 3 to lift the brake rod 1, and further pushes the brake pin 5 to press the friction plate, so that parking brake is realized. With the wet friction plate brake with the structure, the parking brake function can be realized only by the driver actively pulling up the hand brake, and once the driver forgets to pull up the hand brake, a great safety risk exists.

Mode two: as shown in fig. 2, in the conventional two-fork truck brake lever, on one hand, an oil path is designed on the drive axle reduction gearbox housing 17 to provide certain hydraulic oil for service braking, and on the other hand, a brake lever 9 is installed to realize parking braking. A spring 10 is arranged in the brake rod 9, a brake piston 11 is arranged on a drive axle reduction gearbox shell 17, and an oil pipe 12 and an oil pipe 13 are respectively connected on the brake rod 9 and the drive axle reduction gearbox shell 17. When parking, the braking rod 9 is jacked up by the spring force provided by the spring 10, so that the braking piston 11 is pushed to press the friction plate, and parking braking is realized. After the vehicle starts, hydraulic oil is delivered into the cavity 14 of the brake lever 9, pushing the piston rod 15 to compress the spring 10, at this time the brake lever 9 is put down and the parking brake is released. When the brake pedal is stepped on, brake oil is directly conveyed into an oil cavity 16 on a reduction gearbox shell 17 of the drive axle, and a brake piston 11 is pushed to press a friction plate, so that service braking is realized. With the wet friction plate brake with the structure, the safety risk of a driver forgetting to pull up a hand brake is avoided, but as the brake rod only provides a parking brake function, a set of oil ways is needed to be designed on a driving device to realize a service brake function. Because lever effect is lost during service braking, for the whole vehicle, hydraulic oil pressure needs to be increased or friction area needs to be increased, which leads to cost increase.

Both braking modes need to adopt hydraulic oil ways, and relate to oil pipes, brake oil, oil ways in brake rods and the like, and oil pumps are needed to increase oil pressure, so that the structure is complex. Meanwhile, corresponding sealing elements are required to seal, and as the running time is prolonged, the risk that the sealing elements are worn out, oil leakage and even braking cannot be realized easily occurs, so that a large potential safety hazard is caused. In addition, the brake oil liquid needs to be maintained and replaced regularly, so that time is wasted, and maintenance-free operation cannot be achieved. Meanwhile, a hydraulic system is needed, so that the noise is high and the efficiency is low.

Disclosure of Invention

The technical problem to be solved by the invention is to integrate the service braking function and the parking braking function into one brake rod body, thereby more meeting the functional safety requirement and avoiding the adoption of a hydraulic oil way.

The invention solves the technical problems by the following technical means: an integrated electric brake system comprises a brake rod body, an ejector rod, a parking spring, a cover plate, a nut, a motor assembly and a controller; the cover plate is arranged at the tail part of the brake rod body; the ejector rod is movably arranged in the inner cavity of the brake rod body, the ejector rod is provided with an ejector rod head and an ejector rod tail, the ejector rod head penetrates out of the head of the brake rod body, the ejector rod tail penetrates through the cover plate and penetrates out of the tail of the brake rod body, and the ejector rod tail is provided with a screw rod structure; the parking spring is compressed between the ejector rod and the cover plate; the rotor of the motor assembly comprises a rotor output end, the nut is fixedly connected to the rotor output end, and the interior of the nut is matched with a screw rod structure at the tail part of the ejector rod; the motor assembly is connected with the controller.

According to the invention, the service braking function and the parking braking function are integrated in one brake rod body, the parking braking force is provided by the spring pressure, the design of a traditional parking braking hand brake system is omitted, the parking braking can be realized under the condition of no external force intervention, the parking braking failure caused by the conditions of forgetting of a driver or breakage of a guy cable is avoided, the structure is simple, the effect is firm, and the requirement of functional safety is met; the motor assembly is adopted to drive the ejector rod, so that the traditional hydraulic transmission mode is replaced, a hydraulic circuit, an oil pipe, brake oil and a plurality of sealing elements are reduced, the structure is simplified, the risk of brake failure caused by seal failure is reduced, the number of parts and the assembly difficulty are simplified, and meanwhile, maintenance-free operation can be realized without oil replacement; the motor and the ball screw structure are high in efficiency, so that the efficiency of the whole machine is improved, and the noise of the whole machine is effectively reduced; the braking system is controlled in an electric control mode, so that the integrated control of the whole vehicle is easy, the response speed is high, and a hardware foundation is provided for automatic driving or high-order auxiliary driving forklift; the braking device can provide spring force braking or combined force braking of spring force and motor driving force for service braking based on the requirement of the whole vehicle, and improves the comfort in a braking state.

Preferably, the integrated electric brake system further comprises a limiting block, wherein the limiting block is arranged in the inner cavity of the brake rod body, and the ejector rod head penetrates through the limiting block; the inner cavity of the brake rod body is provided with a push rod matching surface, a protruding structure is arranged between the limiting block and the push rod matching surface on the push rod, one side of the protruding structure, which faces the limiting block, is a push rod limiting surface, and one side of the protruding structure, which faces the push rod matching surface, is a push rod contact surface; the parking spring is sleeved outside the ejector rod and compressed between the protruding structure of the ejector rod and the cover plate, one end of the parking spring is in contact with the contact surface of the ejector rod, and the other end of the parking spring is in contact with the inner end surface of the cover plate.

Preferably, the integrated electric brake system further comprises a clamping ring, a clamping ring groove is formed in the inner cavity of the brake rod body, the clamping ring is assembled in the clamping ring groove, and the limiting block is axially fixed through the clamping ring.

Preferably, the ejector rod is provided with an ejector rod matching surface, and the ejector rod matching surface is positioned in contact with the inner hole of the limiting block.

Preferably, the inner cavity of the brake rod body is provided with a cover plate matching surface, a circle of raised cover plate rabbets are arranged on the cover plate, and the cover plate rabbets are positioned in contact with the cover plate matching surface.

Preferably, the rotor of the motor assembly further comprises an avoidance hole, the avoidance hole is arranged at the middle position of the output end of the rotor, and the ejector rod can enter the avoidance hole.

Preferably, the controller is mounted on the motor assembly. The controller is integrated on the motor assembly, reduces wire harness connection, and is high in integration level and easy to assemble.

Preferably, the integrated electric brake system further comprises a fixing pin, the brake rod body is provided with a mounting hole, and the brake rod body can be rotatably connected to the drive axle reduction gearbox shell through the fixing pin penetrating through the mounting hole.

Preferably, a brake pin groove is further formed in the brake rod body, and the brake rod body can be in contact fit with a brake pin on the drive axle reduction gearbox shell through the brake pin groove.

An electric braking method, which adopts the integrated electric braking system, comprises the following steps:

When the vehicle is parked, the motor assembly does not work, the nut can rotate freely, the parking spring pushes the ejector rod head to be in contact with the driving axle reduction gearbox shell, and the brake rod body pushes the brake pin to move towards the wet brake part side, so that parking brake is realized;

When the vehicle is started, the controller drives the rotor of the motor assembly to rotate positively to drive the nut to rotate positively, the ejector rod drives the parking spring to compress further, the brake rod body is put down, the brake pin is reset under the action of the reset spring of the wet brake component, the parking brake is released, and after the vehicle runs normally, the controller controls the rotor of the motor assembly to lock;

when the vehicle brakes in the running process, the controller drives the rotor of the motor assembly to reversely rotate according to the braking force required by the whole vehicle, so that the nut reversely rotates, the head of the ejector rod is pushed to contact with the shell of the reduction gearbox of the drive axle under the combined force of the spring force and the motor, and the brake rod body pushes the brake pin to move towards the wet brake part side, so that the service brake is realized;

when the service brake needs to be released, executing the action when the vehicle is started;

When the vehicle moving operation is needed, the motor assembly and the cover plate are removed, at the moment, the parking spring unloads force, the braking force on the brake pin is released, and the wet brake component is released, so that the vehicle moving can be performed.

The invention can provide spring force braking or combined force braking of spring force and motor driving force for service braking based on the requirement of the whole vehicle, thereby improving the comfort in a braking state.

The motor assembly is detachably designed, so that the vehicle moving requirement during the fault of the braking system can be met, and even if the motor or the controller fails, the vehicle can be moved in a manual release mode, so that the maintenance convenience is improved.

The invention has the advantages that:

1. According to the invention, the service braking function and the parking braking function are integrated in one brake rod body, the parking braking force is provided by the spring pressure, the design of a traditional parking braking hand brake system is omitted, the parking braking can be realized under the condition of no external force intervention, the parking braking failure caused by the conditions of forgetting of a driver or breakage of a guy cable is avoided, the structure is simple, the effect is firm, and the requirement of functional safety is met; the motor assembly is adopted to drive the ejector rod, so that the traditional hydraulic transmission mode is replaced, a hydraulic circuit, an oil pipe, brake oil and a plurality of sealing elements are reduced, the structure is simplified, the risk of brake failure caused by seal failure is reduced, the number of parts and the assembly difficulty are simplified, and meanwhile, maintenance-free operation can be realized without oil replacement; the motor and the ball screw structure are high in efficiency, so that the efficiency of the whole machine is improved, and the noise of the whole machine is effectively reduced; the braking system is controlled in an electric control mode, so that the integrated control of the whole vehicle is easy, the response speed is high, and a hardware foundation is provided for automatic driving or high-order auxiliary driving forklift; the braking device can provide spring force braking or combined force braking of spring force and motor driving force for service braking based on the requirement of the whole vehicle, and improves the comfort in a braking state.

2. The controller is integrated on the motor assembly, reduces wire harness connection, and is high in integration level and easy to assemble.

3. The motor assembly is detachably designed, so that the vehicle moving requirement during the fault of the braking system can be met, and even if the motor or the controller fails, the vehicle can be moved in a manual release mode, so that the maintenance convenience is improved.

Drawings

Fig. 1 is a schematic structural diagram of a conventional forklift brake system and wet brake components.

Fig. 2 is a schematic structural diagram of a conventional two-mode forklift braking system in cooperation with a wet braking component.

Fig. 3 is an isometric view of an integrated electric brake system according to an embodiment of the invention.

Fig. 4 is a schematic cross-sectional view of an integrated electric brake system according to an embodiment of the present invention.

Fig. 5 is a schematic cross-sectional view of a brake lever body according to an embodiment of the present invention.

Fig. 6 is a schematic top view of a brake lever body according to an embodiment of the present invention.

Fig. 7 is an isometric view of a mandrel according to an embodiment of the present invention.

Fig. 8 is a schematic front view of a mandrel according to an embodiment of the present invention.

Fig. 9 is an isometric view of a cover plate according to an embodiment of the invention.

Fig. 10 is an isometric view of a nut according to an embodiment of the invention.

Fig. 11 is an isometric view of a motor assembly according to an embodiment of the invention.

Fig. 12 is a schematic view illustrating a parking brake state of an integrated electric brake system according to an embodiment of the present invention.

Fig. 13 is a schematic view showing a brake release state of the integrated electric brake system according to the embodiment of the present invention.

Fig. 14 is a schematic view illustrating a service braking state of an integrated electric brake system according to an embodiment of the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.

As shown in fig. 3 to 11, an embodiment of the present invention discloses an integrated electric brake system, which includes a brake lever body 18, a push rod 19, a parking spring 20, a stopper 21, a snap ring 22, a cover plate 23, a nut 24, a motor assembly 25, a controller 26, and a fixing pin 27.

The brake lever 18 is provided with a mounting hole 181 and a brake pin groove 182, the brake lever 18 can be rotatably connected to the drive axle gearbox housing 29 through a fixing pin 27 passing through the mounting hole 181 and is in contact fit with a brake pin 28 on the drive axle gearbox housing 29 through the brake pin groove 182, the brake lever 18 can apply force to a wet brake component 30 in the drive axle gearbox housing 29 through the brake pin 28, and the friction plate is compressed, so that the friction plate is attached to generate huge friction force, and finally the friction force is converted into braking torque.

The inner cavity of the brake rod body 18 is sequentially provided with a clamping ring groove 183, an ejector rod matching surface 184 and a cover plate matching surface 185 from the head to the tail; the clamping ring 22 is assembled in the clamping ring groove 183, and the limiting block 21 is arranged in the inner cavity of the brake rod body 18 and is axially fixed through the clamping ring 22; the cover plate 23 is arranged at the tail part of the brake rod body 18, a circle of raised cover plate rabbet 231 is arranged on the cover plate 23, and the cover plate rabbet 231 is positioned in contact with the cover plate matching surface 185.

The ejector rod 19 is movably arranged in the inner cavity of the brake rod body 18, and the ejector rod 19 is provided with an ejector rod head 191, an ejector rod tail 192, an ejector rod matching surface 193, an ejector rod limiting surface 194 and an ejector rod contact surface 195; the ejector rod head 191 passes through the limiting block 21 and passes through the head of the brake rod body 18, the ejector rod tail 192 passes through the cover plate 23 and passes through the tail of the brake rod body 18, and the ejector rod tail 192 is provided with a screw rod structure; the ejector rod matching surface 193 is positioned in contact with the inner hole of the limiting block 21; a protruding structure is arranged between the limiting block 21 and the ejector rod matching surface 184 on the ejector rod 19, one side of the protruding structure facing the limiting block 21 is an ejector rod limiting surface 194, and one side of the protruding structure facing the ejector rod matching surface 184 is an ejector rod contact surface 195.

The parking spring 20 is sleeved outside the ejector rod 19 and compressed between the protruding structure of the ejector rod 19 and the cover plate 23, one end of the parking spring 20 is in contact with the ejector rod contact surface 195, and the other end of the parking spring 20 is in contact with the inner end surface of the cover plate 23.

The motor assembly 25 is arranged at the tail part of the brake rod body 18, and the motor assembly 25 and the cover plate 23 are fixedly connected to the brake rod body 18 through bolts; the rotor of the motor assembly 25 includes a rotor output 251 and a relief hole 252; the nut 24 is a ball nut, the nut 24 is fixedly connected to the rotor output end 251 through a bolt, and the interior of the nut 24 is matched with the screw rod structure of the ejector rod tail 192; the avoidance hole 252 is arranged at the middle position of the rotor output end 251, the ejector rod 19 can enter the avoidance hole 252, and the avoidance hole 252 is used for avoiding the movement of the ejector rod 19 during brake release.

The controller 26 is installed on the motor assembly 25, also can install on the whole car, and motor assembly 25 connects controller 26, and controller 26 is used for controlling the rotor rotation direction of motor assembly 25, the rotor output torque of control motor assembly 25 and provides the moment of resistance to drive nut 24 rotation, nut 24 converts the rotary motion of rotor into the rectilinear motion of ejector pin 19, thereby realizes the axial removal of ejector pin 19 along brake lever body 18.

The invention also discloses an electric braking method, which adopts the integrated electric braking system and comprises the following steps:

As shown in fig. 12, when the vehicle is parked, the controller 26 receives a vehicle parking signal in the powered-on state, at this time, the motor assembly 25 does not work, the nut 24 can rotate freely, the motor rotor and the nut 24 only have friction resistance to the ejector rod 19, no axial pushing force and no axial pulling force are provided, the parking spring 20 pushes the ejector rod 19 to enable the ejector rod head 191 to be in contact with the drive axle reduction gearbox shell 29 under the action of self spring force, the brake rod body 18 pushes the brake pin 28 to move towards the wet brake component 30 side through leverage, at this time, the friction plates of the wet brake component 30 are attached to generate brake torque, parking brake is realized, and at this time, the spring force is balanced on the brake rod body 18 with the force on the brake pin 28 required by parking brake. It should be noted that a gap is still reserved between the ejector rod 19 and the limiting block 21.

As shown in fig. 13, when the vehicle is started, the whole vehicle is electrified, the controller 26 receives a whole vehicle brake release signal, performs a brake release action, the controller 26 drives the rotor of the motor assembly 25 to rotate forward, drives the nut 24 to rotate forward, converts the forward rotation of the rotor into linear movement of the ejector rod 19 towards the direction of the avoidance hole 252 through the screw rod structure of the ejector rod tail 192, at the moment, the ejector rod 19 drives the parking spring 20 to further compress, so that the ejector rod contact surface 195 contacts or approaches the ejector rod matching surface 184, the brake rod body 18 is put down at the moment, the brake pin 28 is reset under the action of the reset spring of the wet brake component 30, the friction plate of the wet brake component 30 is separated, the parking brake is released, the vehicle can run, and after the vehicle runs normally, the controller 26 controls the rotor of the motor assembly 25 to be locked.

As shown in fig. 14, when the vehicle is braked during running, the controller 26 receives a vehicle running brake signal, performs a running brake action, drives the rotor of the motor assembly 25 to rotate reversely according to the braking force required by the vehicle, so that the nut 24 rotates reversely, the reverse rotation of the rotor is converted into linear motion of the ejector rod 19 to the outer direction of the avoidance hole 252 through the screw rod structure of the ejector rod tail 192, the ejector rod head 191 is pushed to contact with the drive axle gearbox shell 29 under the action of the combined force of the spring force and the motor, the brake rod body 18 pushes the brake pin 28 to move to the wet brake component 30 side through the lever action, and at the moment, the friction plate of the wet brake component 30 is attached to generate brake torque, so as to realize running brake. Note that, depending on the magnitude of the braking force required, the push rod 19 and the stopper 21 are attached (in consideration of the maximum braking force under the extreme wear, in general, there is no such condition, and there should normally be a gap) or there is a gap during the service braking.

In particular, when the whole vehicle needs a larger braking torque, the push force generated by the motor assembly 25 driving the nut 24 and the push force of the parking spring 20 push the ejector rod 19 together; when the braking torque required by the whole vehicle is equal to or less than the maximum braking torque of the parking brake, the motor assembly 25 provides a small pushing force or no pushing force or even a small reverse pulling force, and the braking force is provided only by the spring force of the parking spring 20.

When the service brake needs to be released, the controller 26 receives a complete vehicle 'brake release' signal and executes a 'brake release' action when the vehicle is started.

When the whole vehicle is in fault or the braking system is in fault and needs to be moved, the motor assembly 25 is slowly removed, the cover plate 23 is removed, the parking spring 20 is unloaded, the braking force on the braking pin 28 is relieved, the wet braking component 30 is released, the friction plates are separated, and the vehicle can be moved, and the operation is simple.

In the invention, the motor assembly 25 is controlled by the controller 26, so that the braking function is perfect, the power-off parking braking function can be realized, the braking function of only spring force and the braking function of combined force (spring force+screw thrust or spring force-screw thrust) of the motor can be realized according to the braking requirement of the whole vehicle in the power-on state, the braking force can be linearly regulated, meanwhile, the efficiency of the motor and the ball screw structure is high, and the continuous voyage of the whole vehicle is indirectly improved; in addition, the scheme provides a hardware basis for brake-by-wire and automatic driving and high-order auxiliary driving; the invention adopts electric control, has high response speed, can adjust braking force and deceleration based on the vehicle speed, and improves the braking comfort of the whole vehicle.

In the invention, as no hydraulic system exists, the noise is low, the efficiency is high, more sealing elements, oil pipes and the like are saved, the oil replacement is not needed, the leakage risk is avoided, and the maintenance-free performance can be truly realized.

The invention has the advantages that the modular design is realized, the controller can be integrated on the motor, the controller can be separately arranged, and meanwhile, the detachable design is convenient for the vehicle moving maintenance of the whole vehicle, and the like.

The invention adopts an electric control mode to control the braking system, is easy for the integrated control of the whole vehicle, has high response speed, and provides a hardware foundation for automatic driving or high-order auxiliary driving forklift.

The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. An integrated electric brake system, characterized by: the parking device comprises a brake rod body, a mandril, a parking spring, a cover plate, a nut, a motor assembly and a controller; the cover plate is arranged at the tail part of the brake rod body; the ejector rod is movably arranged in the inner cavity of the brake rod body, the ejector rod is provided with an ejector rod head and an ejector rod tail, the ejector rod head penetrates out of the head of the brake rod body, the ejector rod tail penetrates through the cover plate and penetrates out of the tail of the brake rod body, and the ejector rod tail is provided with a screw rod structure; the parking spring is compressed between the ejector rod and the cover plate; the rotor of the motor assembly comprises a rotor output end, the nut is fixedly connected to the rotor output end, and the interior of the nut is matched with a screw rod structure at the tail part of the ejector rod; the motor assembly is connected with the controller.

2. An integrated electric brake system as claimed in claim 1, wherein: the integrated electric brake system further comprises a limiting block, wherein the limiting block is arranged in the inner cavity of the brake rod body, and the head of the ejector rod penetrates through the limiting block; the inner cavity of the brake rod body is provided with a push rod matching surface, a protruding structure is arranged between the limiting block and the push rod matching surface on the push rod, one side of the protruding structure, which faces the limiting block, is a push rod limiting surface, and one side of the protruding structure, which faces the push rod matching surface, is a push rod contact surface; the parking spring is sleeved outside the ejector rod and compressed between the protruding structure of the ejector rod and the cover plate, one end of the parking spring is in contact with the contact surface of the ejector rod, and the other end of the parking spring is in contact with the inner end surface of the cover plate.

3. An integrated electric brake system as claimed in claim 2, wherein: the integrated electric brake system further comprises a clamping ring, a clamping ring groove is formed in the inner cavity of the brake rod body, the clamping ring is assembled in the clamping ring groove, and the limiting block is axially fixed through the clamping ring.

4. An integrated electric brake system as claimed in claim 2, wherein: the ejector rod is provided with an ejector rod matching surface, and the ejector rod matching surface is positioned in contact with the inner hole of the limiting block.

5. An integrated electric brake system as claimed in claim 1, wherein: the inner cavity of the brake rod body is provided with a cover plate matching surface, a circle of raised cover plate rabbet is arranged on the cover plate, and the cover plate rabbet is positioned in contact with the cover plate matching surface.

6. An integrated electric brake system as claimed in claim 1, wherein: the rotor of the motor assembly further comprises an avoidance hole, the avoidance hole is arranged at the middle position of the output end of the rotor, and the ejector rod can enter the avoidance hole.

7. An integrated electric brake system as claimed in claim 1, wherein: the controller is mounted on the motor assembly.

8. An integrated electric brake system as claimed in claim 1, wherein: the integrated electric brake system further comprises a fixing pin, a mounting hole is formed in the brake rod body, and the brake rod body can be rotationally connected to the drive axle reduction gearbox shell through the fixing pin penetrating through the mounting hole.

9. An integrated electric brake system as claimed in claim 1, wherein: the brake rod body is also provided with a brake pin groove, and the brake rod body can be in contact fit with a brake pin on the drive axle reduction gearbox shell through the brake pin groove.

10. An electric braking method, characterized in that: an integrated electric brake system according to any one of claims 1-9, comprising the steps of:

When the vehicle is parked, the motor assembly does not work, the nut can rotate freely, the parking spring pushes the ejector rod head to be in contact with the driving axle reduction gearbox shell, and the brake rod body pushes the brake pin to move towards the wet brake part side, so that parking brake is realized;

When the vehicle is started, the controller drives the rotor of the motor assembly to rotate positively to drive the nut to rotate positively, the ejector rod drives the parking spring to compress further, the brake rod body is put down, the brake pin is reset under the action of the reset spring of the wet brake component, the parking brake is released, and after the vehicle runs normally, the controller controls the rotor of the motor assembly to lock;

when the vehicle brakes in the running process, the controller drives the rotor of the motor assembly to reversely rotate according to the braking force required by the whole vehicle, so that the nut reversely rotates, the head of the ejector rod is pushed to contact with the shell of the reduction gearbox of the drive axle under the combined force of the spring force and the motor, and the brake rod body pushes the brake pin to move towards the wet brake part side, so that the service brake is realized;

when the service brake needs to be released, executing the action when the vehicle is started;

When the vehicle moving operation is needed, the motor assembly and the cover plate are removed, at the moment, the parking spring unloads force, the braking force on the brake pin is released, and the wet brake component is released, so that the vehicle moving can be performed.