KR101350688B1 - Torque changed gears for break pad weared adjusting in Single Motor Electric Wedge Brake System - Google Patents

Abstract

The single motor electric wedge brake system of the present invention allows the main braking function to be implemented using the power generated by the one motor 13, and also the operation of the main braking function motor 13. According to the on / off control of the solenoid mechanism operated in conjunction with the, the forward movement of the NSL (Non-Self Locking) type screw-coupled push rod shaft 31 is constrained or released. By implementing the pad setting interval maintenance function, the torque conversion gear having different gear ratios is engaged with the push rod shaft 31 to reduce the load of the solenoid 41, thereby reducing the solenoid 41 having a lower specification. Even if it is used, it is possible to maintain the restraint state of the push rod shaft 31 and to control the forward movement of the push rod shaft 31 more precisely.

Description

Torque changed gears for break pad weared adjusting in Single Motor Electric Wedge Brake System}

1 is a block diagram of a single motor electronic wedge brake system having a pad setting interval maintaining function using a torque conversion gear according to the present invention.

FIG. 2 is a schematic view of the wedge assembly site of the single motor electronic wedge brake system according to FIG. 1. FIG.

3 is a configuration diagram of a solenoid mechanism (Solenoid Mechanism) for the function of maintaining the pad setting interval using the torque conversion gear according to the present invention

4 is a block diagram of an adjusting device for maintaining a pad setting interval using a torque conversion gear according to the present invention

Figure 5 (a), (b) is an assembly coupling of Figure 4

    Description of the Related Art

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

18: connecting rod

19: wedge roller 20: wedge base plate

30: Adjusting unit 31: Push rod shaft

32: nut 33,34: front and rear bearings

35: spring 36: latch

37: push rod gear 38: latch gear

39: intermediate gear 39a: internal gear

40: solenoid unit

41: solenoid 42: moving axis

43: linkage lever 44: switching lever

44a: Latch contacts

60 housing

The present invention relates to a single motor electronic wedge brake system, and more particularly, to a single motor electronic wedge brake system having a pad setting interval keeping function using a torque conversion gear.

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 the complexity of the configuration and the reliability of the braking performance according to the hydraulic use, there are bounded to some extent to enhance the stability and the vulnerability.

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, the EWB provides a function to automatically adjust the pad's disk to the set interval when the pad's set interval maintenance is exceeded, that is, move the wedge assembly portion toward the pad to adjust the pad interval exceeded. Lose.

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 a braking function but also a number of additional pad setting interval maintenance functions, a fail-safe function, and an EPB function, the overall component configuration becomes very complicated, and in particular, a braking function is provided. In addition to the motors, the separate motors for the implementation of many additional functions have the vulnerability of 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 .

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 the power generated from one motor, and the pad setting interval maintenance function, which is various additional functions, Fail-Safe and EPB functions are implemented using Solenoid Mechanism, which reduces the overall size to one and improves mounting performance. Its purpose is to reduce cost and weight by reducing the number of components to convert and implement motor power.

In addition, the present invention implements a pad setting interval maintenance 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. As implemented using Mechanism, the objective is to reduce the number of parts involved for motor power conversion and implementation to facilitate the overall design.

In addition, the electronic wedge brake (EWB) of the present invention is a solenoid mechanism (Solenoid Mechanism) is operated in conjunction with the operation of the main braking function motor when the function of automatically correcting the maintenance of the pad setting interval when the pad wears In addition to reducing the load burden, the objective of the present invention is to improve the performance of maintaining the pad setting interval.

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 in close contact with the disc wrapped in the wedge caliper, and the self-energizing through the wedge phenomenon caused by the displacement of the wedge roller having a diameter 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 in addition to maintaining pad setting intervals,

A support nut secured to a housing coupled to the side of the wedge caliper, the configuration for maintaining a pad setting gap; A non-self locking (NSL) type screw fastening shaft coupled to the support nut; A latch having a gear tooth to an outer circumferential surface thereof while being press-fitted to the push rod shaft; A pair of front and rear end bearings disposed forward and rearward of the push rod shaft; A pressure spring, one end of which is secured to the support nut and the other end of which is applied a continuous axial force towards the shear bearing; A torque conversion gear composed of a plurality of gears having a gear ratio so as to engage with the latch gear integrally formed in the latch and to have resistance to rotation of the push rod shaft; A solenoid controlled on / off through the ECU to press the interlocking lever provided in the switching lever hinged to one end to the latch or to be engaged with the latch through the moving shaft;

.

The torque conversion gear meshes with the push rod gear provided on the push rod shaft, the latch gear protruding to a smaller diameter from the rear of the latch coupled to the push rod shaft, and the latch gear while being engaged with the push rod gear. It consists of an intermediate gear formed of a small diameter from the back to the internal intermediate gear.

Further, when the push rod gear is the largest diameter (pitch circle diameter), the diameter of the internal gear of the intermediate gear to be engaged is set to a relatively small diameter (pitch circle diameter), and the intermediate gear is the internal gear of the internal gear. It is to have a diameter (pitch circle diameter) larger than the diameter (pitch circle diameter) of, and the diameter (pitch circle diameter) of the latch gear meshed to the intermediate gear is formed smaller than the diameter (pitch circle diameter) of the intermediate gear.

The intermediate gear is positioned between the latch gear and the push rod gear, and the intermediate gear is axially fixed to the housing so as not to restrain the axial movement of the push rod shaft.

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

1 is a block diagram of a single motor electronic wedge brake system having a pad wear adjustment function using a torque conversion gear according to the present invention, wherein the single motor electronic wedge brake system of the present invention is operated by a driver for braking a vehicle. An electronic pedal (1), an ECU (2) for implementing control in consideration of vehicle information during braking, a wedge caliper (6) and an ECU (2) controlled by pressing the disk rotating together with the wheel to perform braking. Braking operation by the power generated by the motor 13, the solenoid mechanism operated in conjunction with the motor 13 to maintain the pad setting interval and fail-safe (Fail-Safe) function and electronic parking It consists of a wedge actuator assembly 10 that implements a brake (EPB) function.

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.

In addition, the single motor electronic wedge brake system further includes a housing 60 to receive a 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 several sensors mounted thereon to transmit measurement signals to the ECU 2. Pad wear detection sensor to detect and maintain optimal pad spacing, as well as load sensor to prevent wheel jamming, which can occur when the pad is pressed against the disc by the action of the wedge roller during braking Done.

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 presses the pad toward the disc with the power generated by the one motor 13 controlled by the ECU 2 during braking to implement braking, and the main braking function motor 13 According to the on / off control of the solenoid mechanism operated in conjunction with the, the forward movement of the NSL (Non-Self Locking) type screw-coupled push rod shaft 31 is constrained or released. In addition, the padding interval maintenance and fail-safe functions, together with the electronic parking brake (EPB) function.

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. To maintain the set intervals of the wedge braking unit 16 and the pad assemblies 7 and 8 that press the pad assemblies 7 and 8 to the disc at one side of the wedge caliper 6, and thus fail the motor accordingly. In addition to the fail-safe function, it consists of a solenoid mechanism for the 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 diagonally across the housing 60, and moves together with the axial movement of the linear motion converter 14 according to the rotation of the motor 13. In addition, 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 Figure 2, by using the linkage rod fixed to the linkage rod 15 coupled to the linear motion converter 14 of the motor 13, it is pressed against the disk Rolling contact surface 17a formed between the wedge moving plate 17 and the wedge base plate 20 and the pair of plates 17 and 20 arranged in parallel to face the wedge moving plate 17 while being moved while being moved. It is comprised between the wedge rollers 19 which are located between 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 to press the pad.

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 the 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 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 to implementing the main braking function through the braking motor unit 11 and the wedge braking unit 16 during the EWB operation, the solenoid mechanism that implements various additional functions is a pad correction function and a fail- In order to implement a fail-safe function and an electronic parking brake function, a non-self locking (NSL) type screw coupled axial moving unit 30 is provided to the disk, and the ECU 2 is provided. It is composed of a solenoid unit 40 which is controlled on and off and releases and locks the restraining force of the adjusting unit 30.

Here, the generation of restraining force between the adjusting unit 30 and the solenoid unit 40 may be implemented in various ways, for example, toward the push rod shaft 31 forming the adjusting unit 30 as shown in FIG. 3. The latch 36 is formed, and the switching lever 44 constituting the solenoid unit 40 is configured in such a manner as to engage or fall off the latch 36 while acting about the hinge point.

And, as shown in FIG. 4, the adjusting unit 30 forms a locking end 32a, which is a groove cut in the outer circumferential surface thereof, and a support nut 32 coupled to the housing 60, and the support nut 32. A push rod shaft 31 screwed into the rod), a latch 36 having a gear tooth on its outer circumferential surface while being press-fitted to the push rod shaft 31, and disposed at the front and rear sides of the push rod shaft 31. The pair of front and rear bearings 33 and 34, one end is fixed to the support nut 32, the other end is composed of a pressing spring 35 for applying a continuous axial force toward the front end bearing (33).

In this case, the latch 36 may be formed directly on the push rod shaft 31.

In addition, when the push rod shaft 31 and the support nut 32 are subjected to an axial direction by using a non-self-locking (NSL) type screw, that is, a screw having a very large lead angle, Due to the large lead angle, the shaft moves automatically in the axial direction.

In addition, the front end bearing 33 is made of a needle bearing that does not restrain rotation while receiving an axial force, and 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 has a torque for reducing the resistance of the push rod shaft 31 against the solenoid 41 so as to reduce the load of the solenoid 41 for restraining the push rod shaft 31. A conversion gear is further provided, and the torque conversion gear is assembled to be axially movable using the housing 60 so as not to restrain the forward movement of the push rod shaft 31.

This torque conversion gear protrudes with a small diameter from the back of the push rod gear 37 provided on the push rod shaft 31 and the latch 36 coupled to the push rod shaft 31 as shown in FIG. Consists of the latch gear 38 and the intermediate gear 39 meshed with the latch gear 38 and at the same time, the internal gear 39a meshed with the push rod gear 37 has a small diameter. .

Here, the intermediate gear 39 is positioned between the latch gear 38 and the push rod gear 37, so that the intermediate gear 39 moves together when the push rod shaft 31 moves in the axial direction.

The gears 37, 38, 39, 39a constituting such a torque converting gear reduce the clamping force on the push rod shaft 31 which the latch 36 is responsible for, namely, the switching lever engaged with the latch 36 ( The solenoid 41 which presses 44 makes it possible to fix the push rod shaft 31 with a smaller force.

This is because the gear ratio difference between the gears 37, 38, 39, and 39a constituting the torque conversion gear has a difference in the number of teeth and the gear ratio difference. For example, the push rod gear 37 has the largest diameter ( If the diameter of the internal intermediate gear 39a of the intermediate gear 39 engaged with the pitch circle diameter) is set to a relatively small diameter (pitch circle diameter), the push rod gear 37 is the internal intermediate gear 39a. When transmitting the rotational force to the furnace (Torque) is lowered.

In addition, the intermediate gear 39 having the internal intermediate gear 39a has a diameter (pitch circle diameter) larger than the diameter (pitch circle diameter) of the internal intermediate gear 39a, The diameter (pitch circle diameter) of the latch gear 38 to be engaged is made smaller than the diameter (pitch circle diameter) of the intermediate gear 39.

Accordingly, the restraining force of the push rod shaft 31 is transferred from the push rod gear 37 to the intermediate gear 39 having the internal intermediate gear 39a, and then engaged with the intermediate gear 39. Since it is transmitted to the latch 36 through, the load of the solenoid 41 restraining the latch 36 can be made smaller than the gear ratio of the torque conversion gear.

That is, the pitch circle diameter difference between the push rod gear 37 and the intermediate gear 39, the internal intermediate gear 39a, and the latch gears 38 constituting the torque conversion gear is, for example, a push with a large pitch circle diameter. When the rotational force is transmitted from the load gear 37 toward the internal intermediate gear 39a of the small pitch circumference, the speed of the internal intermediate gear 39a is increased but the torque transmitted from the push rod gear 37 is reduced, Or vice versa, so that the torque conversion gear can be used to reduce or increase the solenoid load.

When the torque conversion gear is used, the present invention transmits the rotation from the push rod gear 37 having a large pitch diameter to the internal intermediate gear 39a having a small pitch diameter, thereby reducing the torque transmitted to the latch 36. The solenoid 41 acts to reduce the load.

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 accommodated on one side of the housing 60, the solenoid 41 is turned on (On) and off (Off) through the ECU (2), withdrawal during operation of the solenoid 41 It consists of a switching lever 44 which angularly moves about the hinge axis via the incoming movement axis 42.

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 As shown in FIG. 3, 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 shape in which the interlocking lever 43 is provided at a right angle at an end thereof by being hinged and extended at one end thereof, and the latching contact portion protrudes toward the latch 36 at a predetermined portion thereof. 44a) is provided.

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.

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 and the solenoid mechanism associated with driving the motor 13, a pad setting interval maintenance and a fail-safe function and EPB other than main braking are used. All of the functionality is 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 the wedge moving plate 17 coupled to the linkage rod 15 that is directed toward the motor 13 as compared to the fixed wedge base plate 20. This movement of the wedge moving plate 17 pushes the pad (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 move further away from the wedge base plate 20, while the inner pad assembly 7 presses the disc while canceling the reaction force on the disc side ( Input Force), which in turn strengthens the disk pressing force of the inner outer pad assembly (7,8) to generate a braking force.

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.

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.

Meanwhile, the present invention implements both the main braking operation and the pad setting interval maintenance function, the fail-safe function, and the EPB (electronic parking brake) function, which are additional functions, which are non-self locking (NSL). The ECU 2 implements a solenoid 41 that restrains and releases the type screw-coupled push rod shaft 31.

For example, maintaining the pad setting interval during the implementation of this additional function is a function that always maintains the set clearance between the pad and the disk during initial assembly, which is performed at every engine start-up or when the pad wear is recognized by the ECU 2. Implemented in a way that is performed.

In this case, when the pad wear is recognized by the ECU 2, the motor 13 is driven in a situation where the ECU 2 recognizes the pad wear as compared to the method of driving the motor 13 together with the engine starting. The only difference is that all procedures are the same.

For example, when the operation for maintaining the initial set interval between the disk and the pad is implemented when the engine is started, for example, when the engine is started, the ECU 2 recognizing the engine starts the main brake by driving the motor 13. As with the test action, the wedge moving plate 17 is moved through the linear motion conversion unit 14 and the linkage rod 15, and the inner outer pads are provided on both sides of the disc by the movement of the wedge moving plate 17. Assemblies (7, 8) are in close contact.

Since the close contact of the inner outer pad assembly (7,8) with the disk eliminates the condition that the set interval between the inner outer pad assembly (7,8) and the disk (5) has been exceeded, the ECU (2) solenoid By turning off (41), the solenoid restraint force of the push rod shaft 31 is released.

At this time, as shown in Figure 3, the push rod shaft 31 of the solenoid 41 restraining force is released, the pressing force on the interlock lever 43 is released as the moving shaft 41 of the solenoid 41 enters The release of the pressing force of the interlocking lever 43 is performed by the switching lever 44 angularly moving around the hinge point, that is, the latch contact portion 44a of the switching lever 44 angularly moving by the restoring force of the spring is latched 36. ) To release the restraining force of the push rod shaft (31).

The release of the restraining force of the push rod shaft 31 acts so that the push rod shaft 31, which is a non-self locking (NSL) type screw, is axially moved, that is, between the support nut 32 and the push rod shaft 31. Through the axial movement force applied by the provided pressing spring 35, the push rod shaft 31 is moved forward while being released from the support nut 32.

As the push rod shaft 31 behaves in such a manner that the support nut 32 and the NSL (Non-Self Locking) type screw are engaged, when the pressing force received from the pressure spring 35 pushes the push rod shaft 31, the push rod 31 is pushed. The rod shaft 31 is moved forward to move in the axial direction while being rotated to act to maintain the state of the inner outer pad assemblies 7 and 8 which are in close contact with both sides of the disk D. As shown in FIG.

At this time, the reduction gear meshed with the latch 36 of the push rod shaft 31 is moved together with the push rod shaft 31, which means that the intermediate gear 39 constituting the torque converter gear is connected to the latch gear 38. It is located between the push rod gears 37 and the intermediate gear 39 is caused by the axial coupling to allow axial movement within the housing 60.

Then, when the wedge base plate 20, the wedge roller 19, and the wedge moving plate 17 act on the pad to closely adhere to the disk, and the push rod shaft 31 moves forward to maintain this state, the ECU (2) re-drives the motor 13 to adjust the wedge moving plate 17 to establish a set clearance between the pad and the disk 5.

Thereafter, the ECU 2 turns on the solenoid 41 again to engage the switching lever 44 and the latch 36 to restrain the push rod shaft 31 which has been moved forward, 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, and thus, the inner outer pad assembly 7 for the disc 7 is turned on. Excess set interval of 8) is removed, so that the braking force maintenance through the wedge effect of the wedge roller 19 implemented during braking can be made the same.

On the other hand, the main feature of the present invention is to use a specification that generates a lower load on the solenoid 41 for locking and unlocking the restraint state of the push rod shaft 31 to implement the above-described pad setting interval maintenance action, This reduces the torque of the push rod shaft 31 against the solenoid 41 by the action of the torque conversion gear as the push rod shaft 31 is engaged using the torque conversion gear supported through the housing 60. This is due to the zoom.

That is, the torque conversion gear mounted at the position of the latch 36 in which the switching lever 44 behaving by the action of the solenoid 41 engages the push rod shaft at the rear of the latch 36, as shown in FIG. 4. A latch gear provided to the push rod gear 37 and the latch 36 by using the intermediate gear 39 arranged parallel to the push rod shaft 31 and having a push rod gear 37 as the 31. Each of them is engaged with each other at (38).

At this time, the intermediate gear 39 has a larger diameter than the latch gear 38 having a smaller diameter than the latch 36 and is engaged with the latch gear 38, and the push rod has a smaller diameter than the push rod gear 37. The internal intermediate gear 39a is formed with a small diameter at the rear of the intermediate gear 39 so as to engage with the gear 37.

Accordingly, the rotational force generated in the push rod shaft 31 when the solenoid 41 releases the restraining force is engaged with the latch gear 38 formed in the latch 36 as shown in FIGS. 5A and 5B. In addition to being constrained through the intermediate gear 39, it is constrained again through the push rod gear 37 engaged with the internal intermediate gear 39a of the intermediate gear 39.

That is, the restraint of the push rod shaft 31 is coupled with the load of the solenoid 41 applied to the switching lever 44 engaged with the latch 36 provided on the push rod shaft 31, and the torque converter gear. By the restraining force by the latch gear 38, the intermediate gear 39, and the internal intermediate gear 39a, and the push rod gear 37 which form a double state, it becomes a double restraint state.

The restraint of the push rod shaft 31 through the torque conversion gear is such that the solenoid required when the load of the solenoid 41 applied to the switching lever 44 engaged with the latch 36 is small, i.e., without the torque conversion gear. Compared with the load of 41, as the torque converting gear reduces the torque, it is possible to reduce the load of the solenoid 41 by the load for the latch 36 restraint, which is a solenoid 41 having a lower specification under the same conditions. ) Will be available.

In addition, the torque converting gear that lowers the load of the solenoid 41 may allow a more precise adjustment (Adjusting Resolution) to be implemented when the pad setting interval is maintained, which is dependent on the rotation of the latch 36. This results from forming the gear ratio of the torque conversion gear so that the torque conversion gear is rotated shorter.

That is, when the push rod shaft 31 is rotated through the pressure spring 35 according to the release of the restraining force of the solenoid 41, the intermediate gear 39 engaged with the latch 36 of the push rod shaft 31 is latched. The latch 36 coupled to the push rod shaft 31 as the rotation of the 36 is lowered and transferred to the push rod gear 37 engaged with the internal intermediate gear 39a as shown in Fig. 5 (b). Since the push rod gear 37 is not rotated once for one rotation of), the forward movement of the push rod shaft 31 is reduced, thereby enabling more precise control.

Meanwhile, among the various additional functions implemented in the EWB, the fail-safe function and the electronic parking brake (EPB) function are implemented as the solenoid 41 releases or locks the push rod shaft 31. Since the push rod shaft 31 is moved forward by the pressing force of the pressing spring 35 and the torque conversion gear meshed with the latch 36 is implemented in an associated operation as in the implementation of maintaining the pad setting interval, the detailed description thereof is omitted.

As described above, according to the present invention, the solenoid mechanism is turned on in an electrowedge brake (EWB) using one motor that generates power for main braking during braking. In accordance with the off control, the solenoid of the solenoid is implemented when the function of correcting the maintenance of the pad setting interval according to the wear of the pad is implemented by restraining or releasing the forward movement of the non-self locking (NSL) type screw-coupled push rod shaft. As the load burden is reduced by using a torque conversion gear fitted to the push rod shaft with a gear ratio, the specification of the solenoid is lowered, and the axial movement distance of the push rod shaft is also shortened by the torque transducer gear, so as to reduce the pad setting interval. The effect is to make the maintenance implementation more precise.

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. Many additional features, such as maintaining pad setting intervals, fail-safe implementation and electronic parking brake operation, eliminate the problems that can occur when using two power generating motors. It has the effect of improving the installability by reducing the overall size by using only one, reducing the cost and weight by reducing the number of motor motion conversion components, and ease of design by simplifying the motion conversion structure between motor parts. Will be.

Claims (5)

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 the magnetic back force through the wedge phenomenon due to the positional movement of the wedge roller (19) having a diameter On and off of the solenoid 41 which is operated in conjunction with driving of one motor 13 controlled by the ECU 2 by applying the braking force by the pressing force on the disk 5 by Energizing). According to the control, the forward movement of the non-self locking (NSL) type screw-coupled push rod shaft 31 is restrained or released, thereby maintaining the pad setting interval and fail-safe function and electronic parking brake. Single motor electronic wand implements EPB functionality In the brake system, A support nut (32) fixed to a housing (60) coupled to the side of the wedge caliper (6) to maintain a pad setting gap; A push rod shaft (31) screwed to a non-self locking (NSL) type screw on the support nut (32); A latch 36 press-coupled to the push rod shaft 31 and having a gear tooth on an outer circumferential surface thereof; A pair of front and rear end bearings (33, 34) disposed forward and rearward of the push rod shaft (31); A press spring 35, one end of which is fixed to the support nut 32 and the other end of which exerts a continuous axial force towards the shear bearing 33; A torque conversion gear composed of a plurality of gears having a gear ratio so as to engage with the latch gear 38 formed integrally with the latch 36 and to have resistance to rotation of the push rod shaft 31; On via the ECU 2 so as to press the interlocking lever 43 provided on the switching lever 44 hinged to one end to engage or fall off the latch 36 via the moving shaft 42. Maintaining the pad setting intervals with the solenoid 41 being controlled off; The multiple gears of the torque conversion gear include a push rod gear 37 provided in the push rod shaft 31, a latch gear 38 protruding from the latch 36, the latch gear 38 and the push rod gear. A single motor electronic wedge brake system having a pad setting interval keeping function using a torque converting gear, characterized in that it is an intermediate gear 39 meshed with 37. The latch gear (38) of claim 1, wherein the latch gear (38) protrudes with a small diameter behind the latch (36) coupled to the push rod shaft (31), and the intermediate gear (39) is connected to the latch gear (38). Single motor electronic wedge brake system having a pad setting interval maintenance function using a torque conversion gear, characterized in that the internal intermediate gear (39a) to be engaged with the push rod gear (37) to form a small diameter at the back. 3. The diameter of the internal intermediate gear 39a of the intermediate gear 39 engaged with the push rod gear 37 having the largest diameter (pitch circle) when the push rod gear 37 is the largest diameter. Diameter), The intermediate gear 39 has a diameter (pitch circle diameter) that is larger than the diameter (pitch circle diameter) of the internal intermediate gear 39a, Pad setting intervals using the torque conversion gear, characterized in that the diameter (pitch circle diameter) of the latch gear 38 meshed with the intermediate gear 39 is smaller than the diameter (pitch circle diameter) of the intermediate gear 39. Single motor electronic wedge brake system with retention function. 3. The single motor electronic wedge brake system according to claim 2, wherein the intermediate gear (39) is positioned between the latch gear (38) and the push rod gear (37). 5. The pad setting interval of claim 4, wherein the intermediate gear 39 is fixed to a shaft movable to the housing 60 so as not to restrain the axial movement of the push rod shaft 31. Single motor electronic wedge brake system with retention function.

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