KR102014923B1 - Electro-mechanical Brake and Controlling method thereof - Google Patents

Abstract

The present invention relates to an electromechanical brake and a control method thereof, which can easily determine whether parking braking is completed while efficiently performing a parking braking function.
To this end, the present invention is the main braking unit including a main motor for providing a driving force for braking the disk rotates with the wheel; And a parking braking unit connected to the main braking unit to perform a parking braking, wherein the parking braking unit is coupled to a parking brake gear coupled to a rotary gear rotated by the main motor and coupled to the parking braking gear. A ratchet member which is rotated together with the ratchet member, a stopper member selectively coupled to the ratchet member to restrain the rotation of the parking brake gear or release the rotational restraint of the parking brake gear, a moving rod for linearly moving the stopper member, and An electromechanical brake including a linear actuator having a potentiometer for detecting the position of the moving rod and a control method thereof are provided.

Description

Electromechanical Brake and Controlling method

The present invention relates to an electromechanical brake and a control method thereof. More particularly, the present invention relates to an electromechanical brake and a control method thereof capable of efficiently performing a parking braking function while being able to easily determine whether parking braking is completed.

In general, a brake device of a vehicle is a braking device that can decelerate or stop a driving vehicle and keep the vehicle in a parking state. The brake device converts kinetic energy into thermal energy through friction and releases heat generated in the air. Braking is performed.

Recently, electro-mechanical brake devices (EMBs) are being used that can simplify the configuration of devices that conventional hydraulic brakes do not have, and can also realize reliability of braking performance and parking brake action. .

The electromechanical brake device includes an electric motor used as a power source, a speed reducer for reducing torque and amplifying torque, and a power transmission device (gear mechanism) for converting rotational motion of the electric motor into linear motion. do.

However, in the conventional electromechanical brake device, there is a problem that a continuous power is applied to the solenoid in order to maintain the parking brake state or the runner brake release state.

On the other hand, in order to solve the problem that the solenoid is continuously applied, a method of combining the solenoid with the toggle device has been proposed. The driver has a problem that cannot confirm whether the driver is in the parking brake state or the parking brake release state since the driver maintains the home position.

In addition, the conventional solenoid used to maintain the parking braking state or the parking braking release state not only has a short moving stroke, but also a force acting according to the distance to the moving body moved through interaction with the solenoid, There is a problem that cannot provide a constant force.

Republic of Korea Patent Publication No. 10-1701211 (Invention name: Electromechanical brake device, Announcement date: February 1, 2017)

The technical problem to be solved by the present invention is to provide an electromechanical brake and a control method thereof capable of efficiently performing the parking braking function while being able to easily determine whether the parking braking is completed.

The problem to be solved of the present invention is not limited to the above-mentioned technical problem, and other technical problems not mentioned above may be clearly understood by those skilled in the art from the following description. There will be.

In order to solve the above problems, the present invention provides a main braking unit including a main motor for providing a driving force for braking a disk rotated with the wheel; And a parking braking unit connected to the main braking unit to perform parking braking, wherein the parking braking unit is coupled to a parking brake gear coupled to a rotary gear rotated by the main motor and coupled to the parking braking gear. A ratchet member which is rotated together with the ratchet member, a stopper member selectively coupled to the ratchet member to restrain the rotation of the parking brake gear or release the rotational restraint of the parking brake gear, a moving rod for linearly moving the stopper member, and An electromechanical brake is provided that includes a linear actuator having a potentiometer for detecting the position of the moving rod.

The electromechanical brake may further include an elastic member disposed inside the stopper member to cushion the stopper member when the stopper member contacts the ratchet member.

The electromechanical brake may further include a coupling member for coupling the stopper member and the linear actuator.

The ratchet member may include a ratchet body, a ratchet coupling protrusion protruding forward of the ratchet body to be coupled to the parking brake gear, and a ratchet gear projecting to the rear of the ratchet body and selectively coupled to the stopper member. .

The stopper member may include a stopper body forming a space therein and a stopper protrusion protruding forward of the stopper body and selectively coupled to the ratchet gear.

The stopper body may have an insertion coupling portion to which the coupling member is inserted and coupled.

An elastic member seating portion in which one end of the elastic member is seated is formed in the stopper body, and the other end of the elastic member is supported by the end of the movable rod, and the length of the elastic member according to the movement of the movable rod. Can be retracted or restored to its original length.

The linear actuator further includes an actuator body that interacts with the moving rod, and the moving rod may have a coupling hole through which the coupling member passes.

The length of the insertion coupling portion based on the lengthwise direction of the stopper member is formed longer than the length of the coupling hole, the movable rod is first set in the longitudinal direction of the insertion coupling portion in the state that the coupling member is coupled to the coupling hole It may be movable by distance.

When the stopper member is not moved because the gear protrusion of the ratchet gear and the stopper protrusion contact each other when the moving rod moves, the elastic member may be compressed by the moving rod by the first set distance.

When the stopper protrusion and the gear depression of the ratchet gear correspond to each other due to the rotation of the parking brake gear while the elastic member is compressed, the elastic member is restored to its original length and the movable rod moves in the direction of the ratchet member. Can be.

The central axis of the parking brake unit may be disposed parallel to the rotational central axis of the wheel along the width direction of the vehicle.

According to another embodiment of the present invention, the present invention provides a control method of an electromechanical brake, comprising: a disk pressing step of pressing a disk by moving a brake pad of the main braking unit; Operating the linear actuator such that the moving rod of the linear actuator moves in the direction of the ratchet member based on a signal applied from the outside; A first exact position determining step of determining whether the moving rod is at a predetermined front forward position; And, when the moving rod is located in the front position forward, provides a control method of the electromechanical brake comprising the step of shutting off the power applied to the linear actuator.

In the control method of the electromechanical brake, if the moving rod does not exist in the forward position, the moving rod rotates while the parking brake gear is rotated in the direction of releasing the compressed state of the disk by driving the main motor. The method may further include a first parking braking additional step of operating the linear actuator to move in the direction of the ratchet member.

The control method of the electromechanical brake may include a second correct position determining step of determining whether the moving rod exists at the forward correct position after the first parking braking additional action step, and the second correct position determining step. If the moving rod does not exist in the forward position, operating the linear actuator to move the moving rod backwards and simultaneously driving the main motor to rotate the parking brake gear in a direction to further compress the disk. The second parking brake additional action step may be further included.

According to another embodiment of the present invention, the present invention provides a control method of an electromechanical brake, the disk pressing step of pressing the disk by moving the brake pad of the main braking unit; A parking braking step for maintaining the disk compression state through the parking braking unit; In addition, the present invention provides a control method of an electromechanical brake including a parking brake releasing step for releasing the parking braking state.

The parking brake releasing step may include: driving the main motor to rotate the parking brake gear in a direction in which the disk is additionally compressed; Operating the linear actuator such that the moving rod of the linear actuator moves away from the ratchet member based on a signal applied from the outside; A third correct position determining step of determining whether the movable rod is at a preset rear correct position; And, when the moving rod is located in the rear right position, it may include the step of shutting off the power applied to the linear actuator.

In the control method of the electromechanical brake, if the moving rod does not exist at the rear right position in the third right position determination step, the parking brake gear is rotated in a direction to further compress the disc by driving the main motor. The third parking braking further action step may be further included.

The electromechanical brake and the control method thereof according to the present invention have the following effects.

First, by using a linear actuator with a potentiometer, it is easy to check whether the parking brake unit has been completed or not whether the parking brake unit is in the parking brake state or the parking brake release state. There is an advantage to this.

Second, the stroke of the moving rod for parking braking is lengthened by using the linear actuator, and there is an advantage that the parking braking can be stably performed by providing a constant force regardless of the length of the stroke.

Third, the elastic member is installed in the inner space of the stopper member to absorb the shock when the rigid stopper member and the ratchet member are in contact with each other, thereby preventing damage caused by friction and impact of the stopper member and the ratchet member. There is this.

Fourth, because the stopper member, the ratchet member, the elastic member, and the moving rod are organically coupled, the restoring force of the elastic member and the moving direction of the moving rod are the same in the course of the additional action even if the parking braking for the parking braking state is first failed. By operating in the direction there is an advantage that the response speed of the stopper member is fast.

Fifth, since the parking brake units are disposed in parallel with respect to the rotational center axis of the wheel, there is an advantage of increasing space utilization with respect to the vertical space of the vehicle.

1 is a perspective view showing an embodiment of an electromechanical brake according to the present invention.
2 is an exploded perspective view of FIG. 1.
3 is a view showing a parking brake unit provided in the electromechanical brake of FIG.
4 is an exploded perspective view of the parking brake unit of FIG. 3.
FIG. 5 is a cross-sectional view illustrating a state when the parking brake unit of FIG. 3 is in the parking brake release state. FIG.
6 is a cross-sectional view showing a state when the parking braking unit of FIG. 3 is in the parking braking state.
7 is a cross-sectional view illustrating a state when the parking braking unit of FIG. 3 fails to park parking.
8 is a flowchart illustrating a process for causing the electromechanical brake to be in a parking braking state according to the present invention.
9 is a flowchart illustrating a process of releasing a parking braking state by an electromechanical brake according to the present invention.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention in which the above-described problem to be solved may be specifically realized. In describing the present embodiments, the same name and the same reference numerals are used for the same configuration and additional description thereof will be omitted below.

1 is a perspective view showing an embodiment of an electromechanical brake according to the present invention, Figure 2 is an exploded perspective view of FIG.

1 and 2, an electromechanical brake according to the present embodiment will be described.

The electric electromagnetic brake includes a main braking unit 200 for braking a disk (not shown) rotated together with a wheel, a parking braking unit 100 connected to the main braking unit 200 to perform parking braking; A cover unit 300 surrounding a part of the main braking unit 200 while surrounding the parking braking unit 100 is included.

The cover unit 300 includes a front cover 310 disposed in front of the parking braking unit 100 and the main braking unit 200, and a rear cover 330 disposed behind the parking braking unit 100. ) And an intermediate cover 320 disposed between the front cover 310 and the rear cover 330.

Here, the front means a direction away from the center of the wheel (left direction in the drawing of FIG. 1), and the rear means a direction approaching the center of the wheel (right direction in the drawing of FIG. 1).

In addition, the cover unit 300 of the first sealing member 340 for sealing between the front cover 310 and the intermediate cover 320, the middle cover 320 and the rear cover 330 It includes a second sealing member 350 for sealing between.

The central axis A of the parking brake unit may be disposed in parallel with the rotational central axis B of the wheel along the width direction of the vehicle. That is, the detailed configurations of the parking brake unit 100 are operated in a state arranged along the width direction of the vehicle.

In addition, the central axis (C) of the power generating portion of the main braking unit is also disposed in parallel with the rotational central axis (B) of the wheel along the width direction of the vehicle. In addition, detailed configurations of the main braking unit 200 are also arranged along the width direction of the vehicle.

As a result, not only the central axis A of the parking brake unit and the central axis C of the power generating unit are disposed in parallel with the rotational central axis B of the wheel along the width direction of the vehicle, but also the parking braking unit ( Detailed configurations of 100 and detailed configurations of the main braking unit 200 may be disposed along the width direction of the vehicle, thereby increasing space utilization with respect to the vertical space of the vehicle.

The main braking unit 200 includes a brake pad 210, a caliper 220, a pressurizing assembly 230, a gear assembly 240, and a main power generating unit 250.

The brake pads 210 are disposed on both sides of the disk that rotates together with the wheels, thereby braking the rotation of the disk by pressing the disk.

The brake pad 210 is fixed to the caliper 220, and the caliper 220 receives linear movement force from the pressing assembly 230 to move in the direction of pressing the disk.

The pressurizing assembly 230 converts the rotational force transmitted from the gear assembly 240 into a linear movement force and transmits the rotational force to the caliper 220.

The gear assembly 240 transmits the rotational force generated by the main power generating unit 250 to the pressing assembly 230.

The main power generator 250 includes a main motor 251 for generating a driving force for moving the brake pad 210, an electric gear 253 coupled with an output shaft of the main motor 251, and the main And an encoder 252 for position control of the motor 251.

As a result, when the main motor 251 is rotated to brake the disc, the electric gear 253 coupled with the main motor 251 is rotated, the rotational force of the main motor 151 is It is delivered to the gear assembly 240.

The rotational force of the main motor 251 is converted into a linear movement force via the pressurizing assembly 230 connected to the gear assembly 240, and the linear movement force is transmitted to the caliper 220 so that the brake pad ( 210 will press the disk.

After the main braking for the disc is completed by the main braking unit 200, the parking braking is performed by the parking braking unit 100.

3 is a view showing a parking braking unit provided in the electromechanical brake of FIG. 1, FIG. 4 is an exploded perspective view of the parking braking unit of FIG. 3, and FIG. 5 is a parking braking unit of FIG. It is sectional drawing which shows the state at the time of.

3 to 5, the structure of the parking brake unit according to the present embodiment will be described.

The parking brake unit 100 includes a parking brake gear 110, a ratchet member 120, a stopper member 130, an elastic member 150, a coupling member 140, and a linear actuator 160.

In addition, the parking braking unit 100 is disposed on both sides of the connecting gear 170 and the connecting gear 170 for transmitting the rotational force of the parking brake gear 110 to the gear assembly (240 of FIG. 2). It further comprises a connection bearing 180.

The parking brake gear 110 is gear-coupled with the rotary gear rotated by the main motor 251. The parking brake gear 110 corresponds to a gear that increases torque and reduces speed.

In the present embodiment, the electric gear (253 of FIG. 2) is used as the rotary gear, but the present invention is not limited thereto, and the rotary gear is rotated due to the rotational force of the main motor 251. Any one of the gears may be used.

The parking brake gear 110 includes a brake gear body 111 and a plurality of teeth 113 formed along the circumferential surface of the brake gear body 111.

A central axis of the connecting gear 170 penetrates through the central region of the braking gear body 111 so that the parking brake gear 110 and the connecting gear 170 rotate together.

In addition, the braking gear body 111 is formed with a ratchet coupling portion 115 for coupling with the ratchet member 120 in a circumferential direction at regular intervals.

The ratchet member 120 is combined with the parking brake gear 110 to rotate together with the parking brake gear 110.

Specifically, the ratchet member 120 has a ratchet body 121 having a through hole formed at the center thereof, and the ratchet coupling protrusion 125 protruding forward of the ratchet body 121 to be coupled with the parking brake gear 110. And a ratchet gear 123 protruding to the rear of the ratchet body 121 and selectively coupled to the stopper member 130.

The connecting gear 170 penetrates the through-hole of the ratchet body 121, and the ratchet coupling protrusion 125 is coupled to the ratchet coupling part 115, so that the ratchet member 120 is parked. It is disposed in close contact with the rear of the braking gear 130.

The ratchet gears 123 are formed in plural at regular intervals along the rim of the ratchet body 121. In addition, the ratchet gear 123 includes a gear protrusion 123a and a gear recess 123b formed between neighboring gear protrusions 123a.

The gear protrusion 123a protrudes inclined from the ratchet body 121 in a direction in which the ratchet member 120 is rotated so that the ratchet member 120 rotates only in one direction.

One end of the stopper member 130 is selectively accommodated in the gear recess 123b.

The stopper member 130 is selectively coupled to the ratchet member 120 to restrain the rotation of the parking brake gear 110 or release the rotational restraint of the parking brake gear 110.

The stopper member 130 protrudes in a direction opposite to the stopper body 131 forming a space therein and the front of the stopper body 131, that is, the ratchet member 120 and the ratchet gear 123. And a stopper protrusion 133 to be selectively coupled, and an elastic member seating portion 135 formed inside the stopper body 131 to which one end of the elastic member 150 is seated.

The stopper body 131 forms an inner space and is open to the rear, that is, a direction opposite to the linear actuator 160. Therefore, the moving rod 163 of the linear actuator is inserted into a portion of the inner space of the stopper body 131 to a predetermined depth.

In addition, the stopper body 131 is formed with an insertion coupling portion 137 into which the coupling member 140 is inserted and coupled. The insertion coupling part 137 may be provided in the shape of a through hole, or may be provided in the shape of a through groove.

The elastic member 150 is disposed inside the stopper member 130 to cushion the stopper member 130 when the stopper member 130 is in contact with the ratchet member 120.

Specifically, one end of the elastic member 150 is supported by the elastic member seating portion 135, the other end of the elastic member 150 is supported by the end of the moving rod 163. Due to the movement of the movable rod 163, the length of the elastic member 150 may be contracted or restored to its original length.

As a result, the elastic member 150 absorbs the shock when the rigid stopper member 130 and the ratchet member 120 are in contact with each other, so that the friction between the stopper member 130 and the ratchet member 120 may occur. It is possible to prevent damage due to excessive shock.

The linear actuator 160 includes a moving rod 163 for linearly moving the stopper member 130, a potentiometer (not shown) for detecting a position of the moving rod 163, and the moving rod 163. And an actuator body 161 that interacts with the.

When the linear actuator 160 is driven according to an external signal, the moving rod 163 moves relative to the actuator body 161, and the potentiometer is moved according to the moving position of the moving rod 163. Outputs the converted property value.

Here, the main control unit (ECU) provided in the vehicle determines the position of the moving rod 163 based on the characteristic value output from the potentiometer.

As a result, by using the linear actuator 160 having a potentiometer, it is easy to check whether the parking braking unit 100 is in the parking braking state or the parking braking release state, and whether the parking braking is completed. If not, you will be able to take immediate action.

In addition, since the main control unit knows the position of the moving rod 163 of the linear actuator based on the characteristic value of the potentiometer, the position of the stopper protrusion 133 is determined based on the position of the moving rod 163. Able to know. In addition, when the stopper protrusion 133 and the ratchet member 120 are in contact with each other, the main control unit may know the rotation position of the ratchet member 120 based on the position of the stopper protrusion 133. .

Here, since the ratchet gears 123 are disposed on the ratchet member 120 having an annular shape while occupying a predetermined angular area along the circumferential direction, the end of the stopper protrusion 133 is formed of the ratchet gear 123. In the case of contacting the inclined surface, the rotation position of the ratchet gear 123 may be calculated based on the contact position where the end of the stopper protrusion 133 contacts and the geometry of the ratchet gear 123.

Therefore, the main control unit rotates the main body gear 110 by controlling the main motor 251 through the encoder 252 based on the rotational position of the ratchet member 120, the parking As the brake gear 110 is rotated, the ratchet member 120 is rotated to move the gear recess 123b to a position where the stopper protrusion 133 can be accommodated.

In addition, by using the linear actuator 160, the stroke of the movable rod 163 becomes long, and by providing a constant force regardless of the length of the stroke, parking braking can be stably performed.

The coupling member 140 couples the stopper member 130 and the linear actuator 160.

A coupling hole 165 through which the coupling member 140 penetrates is formed in the movable rod 163. Accordingly, the coupling member 140 penetrates through the coupling hole 165 of the moving rod in the process of being inserted into the insertion coupling portion 137 of the stopper member.

Here, the length (L1) of the insertion coupling portion relative to the longitudinal direction of the stopper member 130 is formed longer than the length (L2) of the coupling hole, the coupling member 140 is coupled to the coupling hole 165. In this state, the movable rod 163 is movable by the first set distance D in the longitudinal direction of the insertion coupling portion 137.

On the other hand, Figure 5 is a cross-sectional view showing a state when the parking brake unit is in a parking brake release state, Figure 6 is a cross-sectional view showing a state when the parking brake unit is in a parking braking state, Figure 7 is a parking braking unit This is a cross-sectional view showing the state when the parking brake fails.

5 to 7, the coupling relationship of the detailed configuration of the parking braking unit is as follows.

First, as shown in FIG. 5, when the parking brake unit is in the released state, the stopper protrusion 133 is kept out of the gear recess 123b of the ratchet gear. At this time, the elastic member 150 is to maintain the length of the uncompressed state, the coupling member 140 is disposed rearward on the insertion coupling portion 137 of the stopper member.

When the linear actuator 160 is driven for parking braking, the moving rod 163 of the linear actuator moves in the direction of the ratchet member 120.

As shown in FIG. 6, when the parking braking unit 100 is in the parking braking state due to the movement of the moving rod 163, the stopper protrusion 133 is accommodated in the gear recess 123b of the ratchet gear. Constrain the rotation of the ratchet member 120 to constrain the rotation of the parking brake gear 110.

The direction in which the rotation of the parking brake gear 110 is constrained is restricted in rotation in a direction of releasing the crimping state of the disk to maintain the crimping state of the disk.

At this time, the elastic member 150 is maintained in a compressed state due to the movement of the moving rod 163, the coupling member 140 is disposed in front of the insertion coupling portion 137 of the stopper member.

Meanwhile, as shown in FIG. 7, when the parking braking unit 100 fails to brake the parking, the end of the stopper protrusion 133 is in contact with the gear protrusion 123a of the ratchet gear so that the stopper member 130 is further removed. It does not move in the direction of the ratchet member 120 above.

Here, the length L1 of the insertion coupling portion based on the lengthwise direction of the stopper member 130 is longer than the length L2 of the coupling hole, so that the moving rod 163 and the coupling member 140 are the same. It may be moved in the direction of the ratchet member 120 by a first set distance (D).

At this time, the elastic member 150 is compressed by the first set distance D in the direction of the ratchet member 120 with the movement of the movable rod 163.

When the stopper protrusion 133 and the gear recess 123b of the ratchet gear correspond to each other due to the rotation of the parking brake gear 110 in the compressed state of the elastic member 150, the elastic member 150 is originally At the same time, the moving rod 163 is moved in the direction of the ratchet member 120 so that the parking brake unit 100 can reach the parking braking state as shown in FIG. 6.

Therefore, the stopper member 130 moves in the direction of the ratchet member 120 by the linear actuator 160 while the parking braking unit 100 performs the parking braking, and at the same time, the elastic member 150. Due to the restoring force of the stopper member 120, the response speed of the stopper member 130 is increased during parking braking.

As a result, the stopper member 130, the ratchet member 120, the elastic member 150 and the moving rod 163, the process of proceeding further action even if the parking braking for the parking braking state first fails due to organic coupling In the restoring force of the elastic member 150 and the movement direction of the moving rod 163 to be operated in the same direction, the additional measures can be proceeded quickly.

8 is a flowchart illustrating a process for causing the electromechanical brake to be in a parking braking state according to the present invention. Referring to Figures 1 to 8, the electromechanical brake will be described the process of performing parking braking as follows.

First, the main control unit ECU moves the brake pad 210 of the main braking unit to perform a disk pressing step of pressing the disk (S10).

Next, a linear actuator operation step of operating the linear actuator 160 to move the moving rod 163 of the linear actuator in the direction of the ratchet member 120 based on a signal applied from the outside (S20). That is, the main control unit ECU drives the linear actuator 160.

Next, the main control unit performs a first exact position determination step of determining whether the moving rod 163 is in a preset forward position (S30).

Here, the front forward position means the position of the moving rod 163 when the stopper protrusion 133 of the ratchet member is completely accommodated in the gear recess 123b of the ratchet member.

Next, when the moving rod 163 is located in the forward position, the main control unit cuts off the power applied to the linear actuator 160 (S70).

Next, the step of shutting off the power applied to the main motor 251 of the main braking unit is performed (S80). Of course, the time point at which the power supply to the linear actuator 160 is cut off and the time point at which the power supply to the main motor 251 is cut off may be reversed or performed simultaneously.

If the moving rod 163 does not exist in the forward position, the main control unit drives the main motor 251 to release the parking brake gear 110 in a direction to release the compressed state of the disc. Simultaneously with the rotation, the first parking braking additional step of operating the linear actuator 160 is performed to move the rod 163 in the direction of the ratchet member 120 (S40).

Specifically, as shown in FIG. 7, when the parking brake fails because the end of the stopper protrusion 133 contacts the gear protrusion 123a of the ratchet gear, the main control unit drives the main motor 251. The parking brake gear 110 is rotated in a direction in which the disk is pressed.

Then, the ratchet member 120 coupled with the parking brake gear 110 is rotated to be out of the contact state of the end of the stopper protrusion 133 and the gear protrusion 123a of the ratchet gear.

Next, after the first parking brake addition measure step, the main control unit performs a second right position determination step of determining whether the moving rod 163 is in the forward right position (S50).

The stopper member 130 is moved by the linear actuator 160 by the linear actuator 160 in the direction of the ratchet member 120 in the process of moving the moving rod 163 to the forward right position after the first parking braking step. At the same time as the movement to the ratchet member 120 by the restoring force of the elastic member 150.

Next, when the moving rod 163 is located in the forward position, the main control unit cuts off the power applied to the linear actuator 160 (S70).

If the moving rod 163 does not exist in the front forward position in the second determination of the correct position, the linear actuator 160 is operated to move the moving rod 163 backward. The main control unit drives the main motor 251 to perform the second parking braking additional step of rotating the parking brake gear 110 in the direction in which the disk is further compressed (S60).

Here, although the disk is compressed by the main braking unit in the disk pressing step, the disk may be additionally compressed through the driving of the main motor 251. When the disk is additionally compressed in the second parking brake addition step, a new ratchet gear corresponds to the stopper protrusion 133.

Next, an operation of operating the linear actuator 160 such that the moving rod 163 of the linear actuator moves in the direction of the ratchet member 120 is performed based on a signal applied from the outside (S20).

Next, the main control unit performs the first exact position determination step of determining whether the moving rod 163 is present in the forward position (S30).

As a result, the linear actuator operating step, the first correct position determination step, the first parking brake additional action step, the second correct position determination step and the first position until the movable rod 163 is present at the forward correct position. 2 Additional parking braking action is performed repeatedly.

9 is a flowchart illustrating a process of releasing a parking braking state by an electromechanical brake according to the present invention. Referring to FIGS. 1 to 7 and 9, the process of releasing the parking braking state by the electromechanical brake is as follows.

Before pressing the parking brake release step for releasing the parking braking state, the disk pressing step of pressing the disc by moving the brake pad 210 of the main braking unit, and the parking brake unit 100 through the A parking braking step is performed to maintain the compressed state.

In the parking brake releasing step, the main control unit drives the main motor 251 to rotate the parking brake gear 110 in a direction in which the disk is further compressed (S100).

Next, an operation of operating the linear actuator 160 is performed such that the moving rod 163 of the linear actuator moves away from the ratchet member 120 based on a signal applied from the outside (S200).

Next, the main control unit performs a third exact position determination step of determining whether the moving rod 163 is in a predetermined rear positive position (S300).

Here, the rear right position means the position of the moving rod 163 when the stopper protrusion 133 of the ratchet member is completely out of the gear recess 123b of the ratchet member.

Of course, the present invention is not limited thereto, and the rear exact position may be a specific point of the rear position of the position where the stopper protrusion 133 is completely out of the gear recess 123b.

Next, when the moving rod 163 is located at the rear right position, the main control unit cuts off the power applied to the linear actuator 160 (S500). This completes the parking brake release state.

If the moving rod 163 does not exist in the rear rear position in the third position determination step, the main control unit drives the main motor 251 to further compress the disk. The third parking brake additional action step of rotating the brake gear 110 is performed (S400).

Next, the main control unit performs a third exact position determination step of determining whether the moving rod 163 is at a preset rearward correct position (S300).

As a result, the third correct position determining step and the third parking brake additional measure step are repeatedly performed until the movable rod 163 is in the rear correct position.

As described above, the present invention is not limited to the above-described specific preferred embodiments, and various modifications may be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims. It is possible and such variations are within the scope of the present invention.

100: parking brake unit 110: parking brake gear
111: brake gear body 115: ratchet coupling portion
120: ratchet member 121: ratchet body
123: ratchet gear 125: ratchet coupling protrusion
130: stopper member 131: stopper body
133: stopper protrusion 135: elastic member seating portion
137: insertion coupling portion 140: coupling member
150: elastic member 160: linear actuator
161: actuator body 163: moving rod
165: coupling hole 200: main braking unit
210: brake pad 220: caliper
230: pressurized assembly 240: gear assembly
250: main power generating unit 251: main motor
252: encoder 253: electric gear
300: cover unit

Claims (15)

A main braking unit including a main motor providing a driving force for braking a disk rotated with the wheel; And,
A parking braking unit connected to the main braking unit to perform parking braking;
The parking braking unit
A parking brake gear coupled to a rotary gear rotated by the main motor;
A ratchet member coupled to the parking brake gear and rotating together;
A stopper member selectively coupled to the ratchet member to restrain the rotation of the parking brake gear or to release the rotational restraint of the parking brake gear;
A linear actuator having a moving rod for linearly moving the stopper member and a potentiometer for detecting a position of the moving rod;
An elastic member disposed inside the stopper member to cushion the stopper member when the stopper member contacts the ratchet member;
A coupling member coupling the stopper member and the linear actuator,
The linear actuator includes an actuator body for interacting with the moving rod,
Electromechanical brake, characterized in that the moving rod is formed with a coupling hole through which the coupling member passes. delete delete The method of claim 1,
The ratchet member includes a ratchet body, a ratchet coupling protrusion protruding forward of the ratchet body and coupled to the parking brake gear, and a ratchet gear projecting rearward of the ratchet body and selectively engaged with the stopper member. Electromechanical brake made. The method of claim 4, wherein
The stopper member includes a stopper body forming a space therein and a stopper protrusion protruding forward of the stopper body and selectively coupled to the ratchet gear.
The stopper body of the electromechanical brake, characterized in that the insertion coupling portion is formed is coupled to the coupling member is coupled. The method of claim 5,
An elastic member seating portion in which one end of the elastic member is mounted is formed in the stopper body.
The other end of the elastic member is supported by the end of the moving rod, the electromechanical brake, characterized in that by the movement of the moving rod the length of the elastic member is contracted or restored to its original length. delete The method of claim 6,
The length of the insertion coupling portion based on the lengthwise direction of the stopper member is formed longer than the length of the coupling hole, the movable rod is first set in the longitudinal direction of the insertion coupling portion in the state that the coupling member is coupled to the coupling hole An electromechanical brake characterized by being movable by a distance. The method of claim 8,
If the stopper member is not moved because the gear protrusion of the ratchet gear and the stopper protrusion contact each other during the movement of the movable rod, the elastic member is compressed by the movable rod by the first set distance,
When the stopper protrusion and the gear depression of the ratchet gear correspond to each other due to the rotation of the parking brake gear while the elastic member is compressed, the elastic member is restored to its original length and the movable rod moves in the direction of the ratchet member. Electromechanical brakes, characterized in that. The method according to any one of claims 1, 4 to 6, 8 and 9,
And a center axis of the parking brake unit is disposed parallel to the center axis of rotation of the wheel along the width direction of the vehicle. A control method of an electromechanical brake for controlling the electromechanical brake according to any one of claims 1, 4, 6, 8, and 9,
A disk pressing step of pressing the disk by moving the brake pad of the main braking unit;
Operating the linear actuator such that the moving rod of the linear actuator moves in the direction of the ratchet member based on a signal applied from the outside;
A first exact position determining step of determining whether the moving rod is at a predetermined front forward position; And,
Disconnecting power applied to the linear actuator when the moving rod is positioned at the front forward position;
If the moving rod does not exist in the forward position, the parking brake gear is rotated in the direction of releasing the compressed state of the disc by driving the main motor and the moving rod moves in the direction of the ratchet member. A first parking brake additional action for operating the linear actuator,
The stopper member is moved in the direction of the ratchet member by the linear actuator in the first parking braking additional step, and at the same time as the ratchet member by the restoring force of the elastic member. How to control the mechanical brake. delete The method of claim 11,
A second exact position determining step of determining whether the moving rod exists at the forward position after the first parking braking additional step;
If the moving rod does not exist in the forward position in the second positioning position, operating the linear actuator to move the moving rod backwards and simultaneously driving the main motor to further compress the disc. And a second parking brake additional step of rotating the parking brake gear in a direction. The method of claim 11,
A parking brake releasing step for releasing the state in which the brake pad compresses the disk;
The parking brake release step,
Rotating the parking brake gear in a direction of additionally compressing the disk by driving the main motor;
Operating the linear actuator such that the moving rod of the linear actuator moves away from the ratchet member based on a signal applied from the outside;
A third correct position determining step of determining whether the movable rod is at a preset rear correct position; And,
Blocking the power applied to the linear actuator when the moving rod is positioned at the rear right position. The method of claim 14,
In the third correct position determining step, if the moving rod does not exist in the rear correct position, a third parking brake additional action step of rotating the parking brake gear in a direction of additionally compressing the disk by driving the main motor is performed. The control method of the electromechanical brake, characterized in that it further comprises.

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