KR101317099B1 - Electric Parking Brake gearing typed Single Motor Electric Wedge Brake System - Google Patents

Abstract

According to the present invention, the electronic wedge brake (EWB) using one motor that generates power for main braking during braking, according to the on / off control of the solenoid mechanism When the electronic parking braking is implemented by using the constrained or released forward movement of the non-self-locking (NSL) type screw-coupled push rod shaft, the linear braking motion 14, which is linearly moved by the motor 13, is operated. While moving toward the EPB operation section B beyond the section A, the restraining force of the push rod shaft 31 released by the solenoid 41 is restrained again by the switching lever 44 to generate the parking braking force. Reinforcing the clamping force through the wedge roller 19 positioned with EPB protrusions 17b and 20b formed between the wedge moving plate 17 and the rolling contact surfaces 17a and 20a of the wedge base plate 20. There is a characteristic.

Wedge, Brake, Solenoid, Motor, Pad Wear

Description

Electric parking brake gearing typed single motor electric wedge brake system

The present invention relates to a single motor electronic wedge brake system, and more particularly to an electronic parking brake interlock type single motor electronic wedge brake system.

In general, a brake system is a brake device used to maintain a parking state while simultaneously decelerating or stopping a driving vehicle.

Such a brake system usually uses a frictional brake that converts kinetic energy into heat energy by using frictional force and discharges it into the atmosphere to perform a braking action. This is because a disk rotating together with the wheel is pushed by the hydraulic pressure And performs the braking function.

However, such a hydraulic brake is implemented in such a way that the pad is strongly pushed toward the disc by using hydraulic pressure during braking, so that the master cylinder is operated through a booster for boosting pedal operation force and generates hydraulic pressure, and the hydraulic line leading to the wheel cylinder. Of course, a complex configuration can not only be made of a variety of devices for controlling and assisting them, but there are some limitations such as the complexity of the configuration and strengthening the reliability and stability of braking performance according to hydraulic use.

This makes it possible to simplify the structure that hydraulic brakes do not have, to enhance reliability of braking performance and to realize parking brake action, and to improve the response and performance of ABS (Anti Brake System) (EWB, Electro Wedge Brake) system is being developed and applied for optimum implementation.

The electronic wedge brake, EWB, uses a wedge assembly operated through an actuator to apply braking action by rubbing the brake pad toward the disc using a wedge assembly operated through an actuator.

At this time, the EWB can realize the braking force of the hydraulic brake even when using a motor using a voltage of 12V, which is the EWB self-energizing using the wedge phenomenon (Wedge) This is because the wedge moves and the pad is pressed by the actuator, and the friction force between the pad and the disk acts as an additional input force. Even if the force is small, a large braking force can be realized.

In addition, these EWBs are provided with the ability to automatically compensate for pad wear when the pad wears, ie, to move the wedge assembly area toward the pad to adjust the spacing due to worn pads.

In addition, the EWB is fail-safe, that is, the braking force is not released during brake fail, and the braking force is continuously applied to prevent abnormal rotation of the vehicle body during normal driving. The function of releasing the braking force in the brake fail is also given.

In addition, the EWB can implement an electric parking brake (EPB) function, which is an electronic parking brake.

However, as the EWB implements not only the braking function but also the pad wear compensation function, the fail-safe function, and the EPB function, the overall component configuration becomes very complicated, and especially for the braking function. In addition to the motors, separate motors for implementing multiple additional functions are vulnerable to requiring two motors.

In addition, by using two motors for generating separate motive power, it is necessary to increase the overall size due to the space for accommodating the motors, and such an increase in size causes inconvenience of mounting restrictions on the wheel portions .

In particular, when the electric parking brake (EPB) function is implemented, a more stable EPB function is required because of the parking characteristics of the vehicle.

Accordingly, the present invention has been invented in view of the above, and the electronic wedge brake (EWB, Electro Wedge Brake) implements a braking function using power generated from one motor, and pad wear correction function and fail, which are various additional functions. -Fail-Safe function and EPB function are implemented using Solenoid Mechanism, which reduces the overall size of the motor to one and improves the mountability by using one motor. The goal is to reduce cost and weight by reducing the number of components to convert and implement power.

In addition, the present invention implements a pad wear correction function, a fail-safe function, and an EPB function, which are various additional functions implemented in an electronic wedge brake (EWB), a solenoid mechanism that is not a motor. The purpose is to facilitate the overall design by reducing the number of parts involved for motor power conversion and implementation.

In addition, the present invention has an object to be implemented more stably while reducing the solenoid load when implementing the EPB function of the various additional functions implemented in the electronic wedge (EWB, Electro Wedge Brake).

The present invention for achieving the above object, the rotational force generated in one motor driven through the ECU for generating a control signal according to the braking using the operation signal of the electronic pedal and the information measured in the vehicle movement in the axial direction Is converted to

The inner outer pad assembly is brought into close contact with the disc wrapped in the wedge caliper, and the self-energizing through the wedge phenomenon due to the positional movement of the diameter wedge rollers increases the braking force by the pressing force on the disc. ,

According to the on / off control of the solenoid operated in conjunction with the driving of one motor controlled by the ECU, the forward movement of the non-self locking (NSL) type screw-coupled push rod shaft is restrained or released. In a single motor electronic wedge brake system that implements a fail-safe function and an electronic parking brake (EPB) function, as well as maintaining the distance between the inner pad assembly or the outer pad assembly and the disk,

In the rolling contact surface of the wedge moving plate and the wedge base plate in which the wedge roller is positioned to press the inner pad provided in the inner pad assembly to the disc while moving the axial direction along the motor drive. An EPB protrusion protruding to restrain the positional movement of the wedge roller;

A push rod shaft subjected to continuous pressing force through a pressure spring while being screwed with a non-self locking type screw to a support nut fixed to a housing coupled to a side of the wedge caliper;

A pair of front and rear end bearings disposed forward and rearward of the push rod shaft;

Solenoids that are turned on and off through an ECU;

A switching lever which engages with the latch of the push rod shaft and generates a restraining force while SeeSaw moves the hinge connecting portion as a hinge point through a load applied to the linkage lever in contact with the moving shaft of the solenoid;

As the end of the linear motion conversion part moves toward the EPB operation section beyond the main braking operation section according to the motor driving while forming the upper end of the switching lever, the hinge connection portion, which is the hinge point of the switching lever in the solenoid off state, is centered. An EPB linkage unit configured to be engaged with the latch of the push rod shaft to generate a restraining force;

.

In addition, the switching lever has a support portion having an interlocking lever at a right angle at a lower end portion of the switching lever based on a hinged hinge connection portion, and a latch engagement end engaging with the latch of the push rod shaft is protruded from the side of the support portion. The upper end portion of the hinge connection portion is bent upwardly through an extended portion, and forms an EPB linkage portion for pressing the end portion of the linear motion conversion portion linearly moved by the motor.

According to the present invention, the electronic parking braking operation of the electronic wedge brake (EWB) using one motor that generates power for main braking during braking, the solenoid restraint force is released according to the driving of the motor. In addition to restraining the push rod shaft to generate a parking braking force, the wedge roller is constrained by an EPB protrusion projecting between the rolling contact surfaces where the wedge roller is positioned to further strengthen the clamping force, thus ensuring a more stable parking braking force. It is effective.

In addition, the present invention configures an electronic wedge brake (EWB) using one motor that generates power for main braking during braking, and uses a solenoid mechanism that operates in conjunction with one motor. As a number of additional functions such as inner pad assembly or outer pad assembly and disc spacing, fail-safe implementation and electronic parking brake actuation are implemented, the In addition to eliminating possible problems, it is possible to improve the mounting performance by reducing the overall size by using only one motor, to reduce the cost and weight by reducing the number of motor motion conversion components, as well as There is an effect with ease of design according to the simplification.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a vehicle configuration diagram of an electronic parking brake interlocking type single motor electronic wedge brake system according to the present invention, Figure 2 is a detailed view of the electronic parking brake interlocking type single motor electronic wedge brake system according to FIG. According to the present invention, the single motor electronic wedge brake system applies an electronic pedal (1) operated by a driver for braking a vehicle, an ECU (2) for implementing control in consideration of vehicle information during braking, and a disk rotating along with a wheel. Braking operation is performed by the power generated by the wedge caliper 6 and the ECU 2 controlled one motor 13 to perform braking, and through a solenoid mechanism operated in conjunction with the motor 13. In addition to the inner pad assembly (7) or the outer pad assembly (8) and the space between the disks and fail-safe functions, the electronic parking brake (EPB) function can be implemented. Wedge actuator is composed of Aw assay (10).

In addition, the single motor electronic wedge brake system is further provided with an auxiliary battery (4), which is used for the motor (13) and solenoid (41) of the ECU (2) and the actuator assembly (10). Used as a spare battery.

In addition, the single motor electronic wedge brake system receives a signal so that the ECU 2 recognizes the parking brake switching state when the parking brake is operated. For example, a separate electric signal is generated toward the ECU 2 at the driver's seat. The parking brake button is used.

The single motor electronic wedge brake system further includes a housing 60 to receive the wedge actuator assembly 10 therein, and the housing 60 is coupled using a wedge caliper 6.

Here, the wedge caliper 6 and the housing 60 are coupled to each other in various ways. For example, the wedge caliper 6 forms a guide that can be inserted into the wedge caliper 6 and is coupled to the housing 60. It can be made to the structure.

In addition, the ECU 2 receives the vehicle attitude information through the yaw moment sensor 3 mounted on the vehicle together with the depression amount information of the electronic pedal 1 to be operated to implement the control required for braking. .

In addition, the wedge caliper 6 and the wedge actuator assembly 10 coupled to the wedge caliper 6 have various sensors mounted thereon to transmit measurement signals to the ECU 2. For example, an inner pad provided in the inner pad assembly or Inner pad assembly detects an increase in the gap between the discs due to the wear of the outer pads and detects the optimal inner pad or pad wear sensor to maintain the gap between the outer pad and the disc, as well as the action of the wedge roller during braking. A load sensor or the like is provided to prevent wheel jamming that may occur when the pad is pressed against the disk.

The wedge caliper 6 also includes inner and outer pad assemblies 7 and 8 which are arranged on both sides of the disk and pressurize the disk while surrounding the disk rotating together with the wheels.

This wedge caliper 6 is a torque member (normal caliper type) that implements an interlocking action such that when the inner pad assembly 7 is pressed toward the disc, the outer pad assembly 8 positioned on the opposite side is also moved toward the disc. Brake).

In addition, the wedge actuator assembly 10 applies braking by pressing the inner pad provided on the inner pad assembly 7 toward the disc with the power generated by one motor 13 controlled by the ECU 2 during braking. In addition, according to the on / off control of the solenoid mechanism operated in conjunction with the motor 13, the NSL (Non-Self Locking) type screw-coupled push rod shaft 31 By restraining or releasing the forward movement of the), the electronic paddle brake (EPB) function is implemented along with the space keeping and fail-safe function between the inner pad or the outer pad and the disk.

To this end, the wedge actuator assembly 10 is interlocked with a braking motor unit 11 for generating braking force with power generated by one motor 13 controlled by the ECU 2 and the braking motor unit 11. And the wedge braking unit 16 and the inner pad assembly 7 or the outer pad assembly 8 for pressing the inner pad provided in the inner pad assembly 7 toward the disc at one side of the wedge caliper 6. In addition to maintaining the gap between disks and fail-safe function due to motor failure, it is composed of Solenoid Mechanism for EPB, an electronic parking brake function.

In addition, the braking motor unit 11 generates power for braking function through control of the ECU 2 during braking, which is provided in one space of the housing 60 coupled to the side of the wedge caliper 6. Using only one motor 13 positioned as a power source, the wedge braking unit 16 for pressing the inner pad assembly 7 arranged on one side of the disk is operated.

To this end, the braking motor unit 11 is coupled via a fixing bracket 12 fixed to one side space of the housing 60 coupled to the side of the wedge caliper 6 to control the motor 13 controlled by the ECU 2. And a linear motion converter 14 coupled to the output shaft portion of the motor 13 and axially moved forward and backward with respect to motor rotation, and the linear motion converter 14. 14 is composed of an interlocking rod (15) moved together along the axial movement of the.

Here, the linear motion conversion unit 14 is configured to be coupled to the inner surface of the screw and formed on the outer circumferential surface of the rotating shaft when the rotating shaft is rotated together with the motor 13 to move forward and backward in the axial direction according to the rotation direction of the rotating shaft, This configuration is a structure that is typically applied to the vehicle's EWB.

In addition, the linkage rod 15 is positioned opposite to the motor 13 at an angle across the housing 60, and along with the axial movement of the linear motion converter 14 according to the rotation of the motor 13. In addition to being moved, two pairs are formed in the upper and lower portions of the linear motion converter 14 so that the moving force through the linear motion converter 14 is uniform.

The oblique arrangement of the interlocking rod 15 is for utilization of the space in the housing 60, and reduces the space occupied by the interlocking rod 15 in the housing 60 to form a more compact housing 60. Make it.

In addition, the wedge braking unit 16, as shown in FIG. 2, by using a linkage rod 15 fixed to the linkage rod 15 coupled to the linear motion converter 14 of the motor 13, the disk A rolling contact surface formed between the wedge moving plate 17 and the wedge base plate 20 arranged in parallel so as to face the wedge moving plate 17 and the pair of plates 17 and 20. It is comprised between the wedge rollers 19 which are located between 17a and 20a and generate | occur | produce a frictional force.

In addition, the wedge roller 19 has a circular columnar shape positioned between a pair of plates 17 and 20 arranged to face each other, and is formed by a friction force generated by the behavior of the plates 17 and 20. It generates a wedge phenomenon that implements a self-energizing action, and acts as an input force for pressing the inner pad provided in the inner pad assembly 7.

To this end, the wedge roller 19 is located between the rolling contact surface (17a, 20a) of the cross-sectional shape of the V (V) groove formed on the surface of a pair of plates (17, 20) facing each other, respectively, V) The rolling contact surfaces 17a and 20a having the groove cross-sectional shape move one plate (wedge moving plate 17) toward the inner pad in accordance with the position change of the wedge roller 19, together with the generation of frictional force with the wedge roller 19. Simultaneously implements the move action.

In addition, the wedge base plate 20 is maintained in a fixed state compared to the wedge moving plate 17 that is moved by the power of the motor 13, for this purpose the wedge base plate 20 of the wedge caliper 6 It is formed using a portion of the housing 60 that is coupled to the side.

In addition, the wedge roller 19 is provided between the rolling contact surfaces 17a and 20a of the wedge moving plate 17 and the wedge base plate 20 so that the wedge roller 19 is constrained to maintain the moved position during EPB operation. As shown in Fig. 5, protruding EPB protrusions 17b and 20b are formed, respectively.

The EPB protrusions 17b and 20b are for maintaining the position of the wedge roller 19 when the power of the motor 13 is turned off. That is, the wedge roller 19 is the EPB only during the EPB operation. Climbing over the projections (17b, 20b) to act to maintain the position, for this purpose, the maximum clamping force required for the wedge roller 19 to climb on the EPB projections (17b, 20b) It is designed to be larger than the EPB Maximum Clamping Force so that EPB braking is not released during parking.

In addition, the solenoid mechanism, which implements a number of additional functions in addition to the main braking function through the braking motor unit 11 and the wedge braking unit 16 during the EWB operation, implements the pad correction function and the fail-safe ( In order to implement a fail-safe function and to realize an electronic parking brake function, an adjusting unit 30, which is axially moved toward a disk by a non-self-locking (NSL) type screw, is provided and is turned on through the ECU (2). It is composed of a solenoid unit 40 which is controlled off to release and lock the restraining force of the adjusting unit 30.

In addition, during the operation of the EPB, the solenoid unit 40 is a linear motion conversion unit 14 through the motor 13 to maintain the restraining force of the push rod shaft 32 even when the solenoid 41 is turned off. By interlocking with the linear movement of the) is to mechanically restrain the push rod shaft (32).

To this end, the adjusting unit 30 is coupled to the support nut 32 and NSL (Non-Self Locking) type screw coupled to the housing 60, as shown in FIG. Front and rear of the push rod shaft 31 continuously receiving the pressing force by the pressure spring 35, the latch 31a having gear teeth to the outer circumferential surface of the push rod shaft 31 and the push rod shaft 31 It consists of a pair of front and rear bearings (33, 34) arranged toward the side.

At this time, the NSL (Non-Self Locking) type screw, which combines the push rod shaft 31 and the support nut 32, is subjected to a force in the axial direction by using a screw having a very large lead angle. If it does, it will move automatically in the axial direction due to the large lead angle.

In addition, the front end bearing 33 is made of a needle (Needle) bearing that does not restrain rotation while receiving the axial force, the rear end bearing 34 is made of a (Thrust) bearing.

In addition, the pressure spring 35 is assembled in a state of applying a constant force toward the shear bearing 33 between the support nut 32 and the shear bearing 33 during initial assembly.

In addition, the adjusting unit 30 moves to the central position of the wedge base plate 20 constituting the wedge braking unit 16 such that the pressing force through the push rod shaft 31 acts uniformly on the wedge base plate 20. Arranged.

In addition, the solenoid unit 40 is, as shown in Figure 4, the solenoid 41 is received on one side of the housing 60, the ON (On) and off (Off) through the ECU 2, and the solenoid It consists of a switching lever 44 which angularly moves about the hinge axis via the moving shaft 42 which is taken out and drawn in during operation of the 41.

In addition, between the solenoid 41 and the switching lever 44 is further provided with an interlocking lever 43 for receiving the pressing force through the moving shaft 42 to the switching lever 44, the interlocking lever 43 is At the end of the switching lever 44 has a lever shape extending horizontally toward the solenoid 41.

In addition, the switching lever 44 has a support 44a having an interlocking lever 43 at a right angle at the lower end of the switching lever 44 based on the hinged connection portion 44c hinged, and the side of the support 44a. The latch engaging end 44b engaging with the latch 31a of the push rod shaft 31 is formed to protrude, and is bent upwardly through an extension 44d extending to an upper end of the hinge connection 44c. And the EPB linking portion 44e pressurized by the end of the linear motion converting portion 14 linearly moved by the motor 13.

At this time, the switching lever 44 is usually supported by a spring (mounting the spiral spring with the hinge point coupling) so as to return to the initial state when the solenoid 41 is depressurized.

In addition, the latch engagement end 44b protruding toward the side of the supporting portion 44a of the switching lever 44 is fitted between the gear teeth formed in the latch 31a of the push rod shaft 31 to restrain the push rod shaft 31. Done.

In addition, the EPB linking portion 44e of the switching lever 44 has a distance to the EPB operating section B beyond the main braking operating section A during the EPB operation, and an extension part extending from an upper end portion of the hinge connecting portion 44c. It is determined at design time using the length of (44d).

Hereinafter, the operation of the present invention will be described in detail with reference to the accompanying drawings.

Electro Wedge Brake (EWB) system of the present invention implements the main braking function by using the power generated from one motor 13, and a number of additional functions that are linked to the motor 13 is operated solenoid mechanism According to the on / off control of (Solenoid Mechanism), the forward movement of NSL (Non-Self Locking) type screw-coupled push rod shaft 31 is constrained or released. It is possible to solve all the problems caused by using two motors to implement additional functions.

A single motor electronic wedge brake system of the present invention that implements this feature has been made a number of applications through the present applicant, briefly described with reference to Figure 1, that is, the single motor electronic wedge brake system of the present invention is ECU (2) By using one motor 13 to be controlled, a solenoid mechanism associated with driving the motor 13 is used, and the inner pad assembly 7 or the outer pad assembly 8 and the disk other than the main braking are used. Interval maintenance, fail-safe and EPB functionality are both implemented.

Briefly describing the main braking action implemented in the single motor electronic wedge brake system of the present invention, the main braking function is for the vehicle in which the ECU 2 is traveling through various sensors together with the depression amount of the electronic pedal 1. When the information is driven to drive the motor 13, the rotational force of the motor 13 is converted into a moving force in the axial direction through the linear motion conversion unit 14 and the linkage rod 15, thereby wedge braking unit 16. Will push.

In this case, when the rotation direction of the motor 13 is the forward rotation, the wedge braking unit 16 is braking when the vehicle moves away from the motor 13, and when the rotation is reverse, the wedge braking unit 16 approaches the motor 13. It is classified as a braking situation when reversing.

The behavior of the wedge braking unit 16 receiving such an axial movement force is connected to the connecting rod 18 coupled to the linkage rod 15 that is connected to the motor 13 relative to the fixed wedge base plate 20. The wedge moving plate 17 is moved by a medium, and the movement of the wedge moving plate 17 pushes the inner pad provided in the inner pad assembly 7 toward the rotating disk.

Then, as the wedge moving plate 17 is further advanced, the wedge roller 19 positioned on the rolling contact surfaces 17a and 20a between the wedge moving plate 17 and the wedge base plate 20 is moved in position, that is, wedge moving. Through the frictional force and the movement of the plate 17, the wedge roller 19 is moved outward from the center position of the rolling contact surface (17a, 20a) generates a wedge effect.

This wedge effect of the wedge roller 19 causes the wedge moving plate 17 to be further away from the wedge base plate 20, while the inner pad provided on the inner pad assembly 7 offsets the reaction force on the disc side. It acts as an input force to pressurize, thereby increasing the disk pressing force of the inner pad provided in the inner pad assembly 7 and the outer pad provided in the outer pad assembly 8 to generate a braking force. do.

When the braking is released in this braking state, the ECU 2 rotates the motor 13 in reverse to pull the wedge moving plate 17 through the linear motion converter 14 and the interlocking rod 15 to the initial position. This initial position return of the wedge moving plate 17 releases the braking force on the disk as the wedge roller 19 is moved to the center of the rolling contact surfaces 17a and 20a.

At this time, the linear motion conversion unit 14 which is moved straight through the motor 13 is not moved to the EPB operation section (B) out of the main braking operation section (A), as shown in FIG. Due to this operation of the switching lever 44 of the solenoid unit 40 through the linear motion conversion unit 14 is not made.

In addition, braking is performed in the same manner as in the case of forward braking even when the vehicle is braking backward, except that the control of the motor 13 of the ECU 2 causes the motor 13 to rotate in reverse (referred to as forward rotation). Since only there is a detailed description thereof will be omitted.

On the other hand, the present invention, in addition to the operation during the main braking, additional functions such as the inner pad assembly (7) or the outer pad assembly (8) and the space keeping function between the disc and the fail-safe function and EPB (electronic parking) Brake) function is implemented, which, together with the control of the ECU 2 for the solenoid 41 which restrains and releases the non-self-locking (NSL) type screwed push rod shaft 31, The switching lever 44 of the solenoid unit 40 through the linear motion conversion unit 14 that is linearly moved through the operation is implemented.

For example, the above-described EPB operation, which is a main feature of the present invention, is a braking maintenance function when the electronic parking brake is operated through the EWB, so that the solenoid 41 is switched to the off state. The linear motion converting portion 14, which is linearly moved through, is moved toward the EPB operating section B beyond the main braking operation section A, and the movement of the linear motion converting portion 14 pushes the switching lever 44. Engages the latch 31a side of the push rod shaft 31 to restrain the push rod shaft 31 and between the rolling contact surfaces 17a and 20a of the wedge moving plate 17 and the wedge base plate 20. It is realized through a clamping force through the wedge roller 19, which is located in the formed EPB protrusions (17b, 20b).

That is, when the ECU 2 recognizes that the vehicle is switched to the parking braking state (which uses a method of signaling the ECU using a button or a similar method), the ECU 2 turns off the solenoid 41. By switching to the state, the latch engagement end 44b of the switching lever 44 is dropped from the latch 31a to release the restriction of the push rod shaft 31.

As the restraint of the push rod shaft 31 through the switching lever 44 of the solenoid 41 is released, the push rod shaft 31 which is subjected to the pressing force of the pressure spring 35 is pulled out of the support nut 32. Moving forward and out, this forward movement of the push rod shaft 31 pushes the wedge base plate 20 through the rear bearing 34 to engage the wedge moving plate 17 on which the wedge roller 19 is located and coupled thereto. The inner pad provided in the inner pad assembly 7 is pushed toward the disk 5.

Subsequently, when the inner pad provided in the inner pad assembly 7 and the disk 5 come into contact with each other through the forward movement of the push rod shaft 31 according to the off of the solenoid 41, the ECU 2 ) Drives the motor 13 to maintain braking force.

That is, when the wedge moving plate 17 is moved by the sequential action of the linear motion conversion unit 14, the linkage rod 15, and the connecting rod 18 by the driving of the motor 13, the wedge moving plate 17 is moved. ) Pushes the inner pad provided on the inner pad assembly 7 toward the disk.

As the wedge moving plate 17 is moved as described above, the wedge roller 19 is also moved by frictional force with the wedge moving plate 17, and the wedge roller 19 is moved by the wedge moving plate 17. To act as an input force to the disk (5).

The positional movement of the wedge roller 19 further moves the wedge moving plate 17 initially moved through the push rod shaft 31, as shown in FIGS. 5 (a) and (b). The inner pad provided in the inner pad assembly 7 coupled to the wedge moving plate 17 presses the disk to generate the parking braking force.

This parking braking is typically pushed further than the main braking, which is the wedge roller moved through the axial movement of the wedge moving plate 17 through the motor 13, as shown in FIG. By moving (19) additionally.

That is, the linear motion converter 14, which is axially moved according to the driving of the motor 13, moves toward the EPB operation section B beyond the main braking operation section A during the EPB operation, as shown in FIG. The additional movement of the linear motion converter 14 pushes the EPB linkage 44e, which is the upper end of the switching lever 44.

Subsequently, the pressing force of the linear motion converter 14 applied to the switching lever 44 refers to the hinge connection portion 44c which is the hinge point of the switching lever 44, that is, the seesaw behavior of the switching lever 44. As a result, the lower end portion of the support portion 44a is moved toward the latch 31a of the push rod shaft 31, and the latch engagement end 44b protruding in accordance with the movement of the support portion 44a is the gear teeth of the latch 31a. When interposed and restrains the push rod shaft 31, the restraining force of the push rod shaft 31, which has been released according to the off of the solenoid 41, is again restrained by the switching lever 44.

As such, the push rod shaft 31 is held by the switching lever 44 driven by the linear motion converter 14 moved toward the EPB operating section B, and thus the motor 13 and the solenoid 41 during the EPB operation. The parking braking force can be maintained even when () is off.

In addition to the restraint of the push rod shaft 31 for maintaining the parking braking force, the wedge roller 19 is also restrained to maintain the shifted state, thereby enhancing the parking braking force retention, which is dependent on the driving of the motor 13 during the EPB operation. The further positional movement of the wedge roller 19 according to this is shown in FIG. 5 (c), with the EPB protrusion protruding between the wedge moving plate 17 and the rolling contact surfaces 17a, 20a of the wedge base plate 20. As the vehicle rides over the 17b and 20b, the wedge roller 19 is held between the EPB protrusions 17b and 20b to prevent the EPB braking from being released in the parking state.

At this time, the clamping force required for the wedge roller 19 to climb on the EPB protrusions 17b and 20b is designed to be larger than the maximum parking clamping force, which is required brake braking force and parking braking force. It depends on each.

On the other hand, the inner pad assembly (7) or the outer pad assembly (8) and maintaining the distance between the disk according to the present invention, the inner pad or outer pad assembly (8) provided in the inner pad assembly (7) during initial assembly It is a function that always maintains a set clearance between the outer pad and the disk provided in the engine, which is implemented every time the engine is started, or implemented in a manner that is performed when the inner pad or the outer pad is worn by the ECU 2. Briefly described as follows.

That is, when the engine 2 drives the motor 13 and the wedge moving plate 17 moves linearly through the linear motion converter 14 in response to the engine starting, the wedge roller 19 is positioned as in the case of main braking. As it moves, the inner pad and outer pad which are provided in the inner outer pad assemblies 7 and 8, respectively, are brought into close contact with both sides of the disk.

The solenoid 41 of the ECU 2 is turned off when the inner pads provided in the inner outer pad assemblies 7 and 8 and the outer pads are not in close contact with each other by a set interval. The push rod shaft 31, which is a NSL (Non-Self Locking) type screw, which is subjected to the axial force applied by the pressure spring 35, is moved forward, and the push rod shaft 31, which is moved forward, is a wedge base plate. On contact with and supporting the (20) side, the ECU 2 restarts the motor 13 so that the set clearance between the inner pad assembly 7 and the outer pad assembly 8 and the disk 5 is set. The wedge moving plate 17 is moved to establish.

Then, the ECU 2 turns on the solenoid 41 so that the switching lever 44 engages with the latch 31a to switch the push rod shaft 31 to a fixed state, and then the ECU 2 The motor 13 is rotated in reverse to switch the wedge base plate 20, the wedge roller 19, and the wedge moving plate 17 to an initial state, thereby causing the inner outer pad assembly (7, 8) to the disc. Excess set interval of) is eliminated, so that the braking force maintenance through the wedge effect of the wedge roller 19 implemented during braking can be made equal.

In addition, among the various additional functions implemented in the EWB, when the motor 13 breaks down in the braking state or when wheel jamming occurs in the wedge roller 19, the pressing action of the wedge braking unit 16 is released. The fail-safe function, ie, the fail-safe function, which releases the pressing force on the disk and prevents the vehicle from behaving due to unwanted braking force, is described. As the ECU 2 switches the solenoid 41 to an off state, the ECU 2 releases the restraint of the push rod shaft 31.

As the push rod shaft 31 is released, the push rod shaft 31 coupled with the NSL (Non-Self Locking) type screw is moved forward, thereby causing the push rod shaft 31 to move to the inner pad assembly. After switching from the inner pad side provided in the Say 7 to the reaction state, the reaction force causes the push rod shaft 31 to retreat back to the support nut 32 to release the wedge effect. -Switch to Fail-Safe state.

1 is a vehicle configuration of the electronic parking brake interlocking type single motor electronic wedge brake system according to the present invention

Figure 2 is a detailed view of the electronic parking brake interlock type single motor electronic wedge brake system according to Figure 1

Figure 3 is a configuration diagram of the solenoid mechanism (Solenoid Mechanism) for the electronic parking brake operation according to the present invention

Figure 4 is an electronic parking brake operating state in accordance with the present invention

5 is an operational state diagram of the wedge portion according to the operation of the electronic parking brake interlocking type single motor electronic wedge brake system according to the present invention.

    <Description of the symbols for the main parts of the drawings>

1: electronic pedal 2: ECU

3: yaw moment sensor 4: auxiliary battery

6: wedge caliper

7,8: inner outer pad assembly

10: wedge actuator assembly

11 braking motor unit 12 fixing bracket

13: motor 14: linear motion converter

15: Interlocking Rod 16: Wedge Braking Unit

17: wedge moving plate 17a, 20a: rolling contact surface

17b, 20b: EPB turning 18: connecting rod

19: wedge roller 20: wedge base plate

30: Adjusting unit 31: Push rod shaft

31a: latch 32: support nut

33,34: Front and rear bearings

35: spring 40: solenoid unit

41: solenoid 42: moving axis

43: linkage lever 44: switching lever

44a: support portion 44b: latch engagement end

44c: hinge connection 44d: extension

44e: EPB linkage

60 housing

A: Main braking operation section B: EPB operating section

Claims (3)

The rotational force generated by the one motor 13 driven by the ECU 2 generating the control signal according to the braking using the operation signal of the electronic pedal 1 and the information measured in the vehicle is converted into motion in the axial direction. , The inner outer pad assembly (7,8) is brought into close contact with the disc wrapped in the wedge caliper (6), and self-energizing through the wedge phenomenon due to the positional movement of the wedge roller (19) having a diameter. ) To increase the braking force by the pressing force on the disc, According to the on / off control of the solenoid 41 operated in conjunction with driving one motor 13 controlled by the ECU 2, a NSL (Non-Self Locking) type screw coupled push By restraining or releasing the forward movement of the rod shaft 31, the gap between the inner pad assembly 7 or the outer pad assembly 8 and the disk can be maintained together with a fail-safe function and electronics. In a single motor electronic wedge brake system that implements parking brake (EPB) functionality, The wedge moving plate 17 in which the configuration for implementing the EPB operation is located in the wedge roller 19 for pressing the inner pad provided in the inner pad assembly 7 toward the disk while being axially moved according to the driving of the motor 13. And EPB protrusions (17b, 20b) protruding from the rolling contact surfaces (17a, 20a) of the wedge base plate (20) to constrain the positional movement of the wedge roller (19); A push rod shaft (Non-Self Locking) type screw fastened to a support nut 32 fixed to a housing 60 coupled to the side of the wedge caliper 6, and receives a constant pressing force through the pressure spring 35 ( 31); A pair of front and rear end bearings (33, 34) disposed forward and rearward of the push rod shaft (31); A solenoid 41 which is controlled on and off by the ECU 2; The latch of the push rod shaft 31 while the SeeSaw acts as the hinge point 44c as a hinge point through a load applied to the linkage lever 43 in contact with the moving shaft 42 of the solenoid 41. A switching lever 44 which meshes with 31a to generate a restraining force; As the end of the linear motion conversion unit 14 is moved toward the EPB operation section B beyond the main braking operation section A according to the driving of the motor 13 while forming the upper end of the switching lever 44, the solenoid ( 41) The EPB linkage 44e which moves the switching lever 44 around the hinge connection portion 44c which is the hinge point in the off state and engages the latch 31a of the push rod shaft 31 to generate a restraining force. ; Electronic parking brake interlock type single motor electronic wedge brake system, characterized in that consisting of. The method of claim 1, wherein the EPB protrusions 17b and 20b are sized so that the wedge roller 19 climbs over the EPB protrusions 17b and 20b with a force greater than the EPB maximum clamping force during the EPB operation. Electronic parking brake interlock type single motor electronic wedge brake system characterized by having a shape with The support lever 44 of claim 1, wherein the switching lever 44 is formed at a lower end of the switching lever 44 at a right angle with respect to the hinge connection part 44c hinged. The latch engaging end 44b engaging with the latch 31a of the push rod shaft 31 protrudes from the side surface of the push rod shaft 31, and the upper end of the hinge connecting portion 44c extends through the extension 44d. Electronic parking brake interlock type single motor electromagnetic wedge brake, characterized in that the EPB linkage portion 44e is formed by bending the direction, the end of the linear motion conversion portion 14 which is linearly moved through the main braking motor 13 is pressed. system

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