KR101350571B1 - Wheel jamming protected typed wedge assembly for Vehicle Brake Sysrem - Google Patents

Abstract

The present invention relates to a wheel jamming prevention wedge assembly, wherein a wedge assembly (7) mounted on an electro mechanical brake (EMB) or an electro wedge brake (EWB) has its own force through the relative movement of the pad through the disk (D). When the wedge roller 9 tries to excessively move the position of the wedge roller 9 due to abnormal control or error, and also acts to add a pressing force toward the disk D by the self-energizing action. ), The positional movement automatically lowers the friction force of the wedge roller 9 so that wheel jamming does not occur.

Description

Wheel jamming protected typed wedge assembly for Vehicle Brake Sysrem}

1 is a block diagram of a wheel jamming prevention type wedge assembly of the electric (or electronic) wedge brake device according to the present invention.

Figure 2 is a wheel jamming prevention operation of the wedge assembly during operation of the electric (or electronic) wedge brake device according to the invention

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

1: wedge caliper 2: torque member

3,4: inner outer pad assembly

5: motor 6: piston nut

6a: moving shaft 6b: pressurizing block

7: wedge assembly 8: wedge moving plate

8a, 10a: rolling contact surface 8b, 10b: extended rolling contact surface

9: wedge roller

10: wedge base plate

D: disk

The present invention relates to an electric (or electronic) wedge brake device, and more particularly to preventing wheel jamming of a wedge assembly during braking.

Generally, a brake system is a braking device used to decelerate or stop a traveling vehicle while maintaining a parked state.

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.

As a result, the EMB (Electro Mechanical Brake) which can simplify the structure that the hydraulic brake does not have and enhance the reliability of the braking performance is used.

In addition, a groove formed between a pair of plates that behaves with the pad, that is, using an electronic wedge brake (EWB) that uses a wedge assembly to reinforce the EMB's vulnerability (using a 42V high voltage motor) to use only the motor as a braking force. Positioning the rollers between them creates a wedge phenomenon that allows self-energizing through frictional forces generated by the plate's behavior, and acts as an input force to press the pads. Performance can be achieved.

However, EMB or EWB using such a wedge assembly is a very important control factor for the wedge assembly in which the friction force generated from the roller is used as an input force to add a braking force, but such a wedge assembly is a common factor. As the contact surface of the roller contacting the rollers has a V-shaped cross-sectional shape, wheel jamming occurs when the frictional force control of the roller is insufficient during operation, which may cause excessive braking force. There is a vulnerability.

Accordingly, the present invention has been made in view of the above, and changes the shape of the contact surface of the roller so that excessive friction force is not generated on the roller of the wedge assembly, and prevents wheel jamming even if the roller friction control is insufficient. This is to minimize the damage of the related parts or the vehicle operation error caused by excessive friction force.

The present invention for achieving the above object, the wedge caliper surrounding the disc (D) to rotate with the wheel, and the motor driven through the ECU to perform the control via the operation signal of the electronic pedal, in the motor In electromechanical brake (EMB) or electrowedge brake (EWB), which is an electric (electronic) wedge brake device composed of a wedge assembly for pressing a pad toward a disc through a conversion medium that converts the generated rotational force into a linear movement force,

The wedge assembly includes a wedge moving plate coupled to an inner pad assembly positioned to one side of the disk and moving together with a pad interlocking with the disk;

A wedge base plate opposed to the wedge moving plate and subjected to a pressing force from a piston nut;

Self-Energizing effect is realized by being located between the extended rolling contact surfaces that form a larger angle than the rolling contact surface, which is a plurality of V-groove cross-sectional shapes each formed on a pair of plate surfaces facing each other. Wedge rollers create a wedge phenomenon that increases the disk's pressure on the pad and reduces the amount of friction when positioned on the extended rolling contact, preventing wheel jamming.

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The angle b formed by the extended rolling contact surface is larger than the friction angle formed between the pad and the disk.

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

Figure 1 shows a block diagram of the wheel jamming prevention type wedge assembly of the electronic wedge brake device according to the present invention, the wedge caliper (1) surrounding the disc (D) rotates with the wheel of the present invention, and the electronic A wedge for pressing the pad toward the disc D through a motor 5 driven through an ECU that performs control through an operation signal of a pedal, and a conversion medium that converts the rotational force generated by the motor 5 into a linear movement force. In an electromechanical brake (EMB) or an electrowedge brake (EWB), which is an electric (electronic) wedge brake device composed of the assembly 7,

The wedge assembly 7 has a circular columnar wedge roller 9 positioned in a groove formed in the plate between a pair of plates 8 and 10 arranged so as to face each other. The friction force generated by the behavior generates a wedge phenomenon in which a self-energizing effect is realized, and acts as an input force to press the pad.

In addition, the wedge assembly 7 has a high frictional force such that when the wedge roller 9 is moved along the groove between the plates 8, 10, the frictional force is reduced according to the positional change of the wedge roller 9. This prevents wheel jamming from occurring.

To this end, the wedge assembly 7 is coupled to the inner pad assembly 3 located to one side of the disk D, and the wedge moving plate 8 moving together with the pad 3 interlocked with the disk D, Wedges provided between the wedge base plate 10 and the plates 8 and 10 which are pressed against the wedge moving plate 8 and are subjected to a pressing force from the piston nut 6 to implement a self-energizing action. Wedge) is composed of a wedge roller (9) which causes the disk (D) of the pad to strengthen the pressure.

Here, the wedge roller 9 has a circular columnar shape positioned between a pair of plates 8 and 10 arranged to face each other, and thus is self-sustained through frictional force generated by the behavior of the plates 8 and 10. Self-Energizing acts as a wedge, which acts as an input force to press the pads.

In addition, the rolling contact surfaces 8a and 10a each having a plurality of V-groove cross-sectional shapes formed on the surface of the pair of plates 8 and 10 facing each other are located at positions of the wedge rollers 9 positioned therebetween. The extended rolling contact surfaces 8b and 10b are formed by raising the end portions of the rolling contact surfaces 8a and 10a upward so that the frictional forces forming with the rolling contact surfaces 8a and 10a during movement are reduced.

That is, when the angle rising from the center of the rolling contact surfaces 8a and 10a to both sides is a, the extended rolling contact surfaces 8b and 10b rising upward from the end portions of the rolling contact surfaces 8a and 10a. The angle b formed by) is formed at an angle larger than the angle a. In one example, the rolling contact surfaces 8a, 10a form an angle a with the virtual horizontal line of the V (V) groove cross section, and the extended rolling contact surfaces 8b, 10b form the virtual horizontal line and the angle b of the V (V) groove cross section. Form. Based on the virtual horizontal line of the V-groove cross section, the angle b of the extended rolling contact surfaces 8b and 10b forms a larger angle than the angle a of the rolling contact surfaces 8a and 10a.

As the angle between the wedge roller 9 and the rolling contact surfaces 8a and 10a is changed as described above, the frictional force of the wedge roller 9 increases as the angular size of the rolling contact surfaces 8a and 10a increases. As a result, the wedge roller 9 has a smaller amount of friction force generated when positioned on the extended rolling contact surfaces 8b, 10b than the amount of friction force generated when positioned on the rolling contact surfaces 8a, 10a.

In addition, the angle b formed by the extended rolling contact surfaces 8b and 10b is formed using the friction angle formed between the pad and the disk D, regardless of the angle a of the rolling contact surfaces 8a and 10a. You can also determine the size.

This means that if the angle b formed by the extended rolling contact surfaces 8b and 10b is formed larger than the friction angle formed between the pad and the disk D, the wedge roller is affected by the friction force between the pad and the disk D. Wheel jamming of 9) can be more stably prevented.

In this way, the change in the magnitude of the frictional force generated by the change of position causes the wedge assembly 7 having the wedge roller 9 to be applied to both the EMB (Electro mechanical Brake) or the EWB (Electro Wedge Brake), so that abnormal control during operation is achieved. Even if the positional movement of the wedge roller 9 is excessively caused due to an error, the friction force of the wedge roller 9 is lowered so that wheel jamming does not occur.

For example, when the wedge assembly 7 is mounted on the EMB as shown in FIG. 1, that is, the EMB is used for the operation of the electronic pedal and the wedge caliper 1 which surrounds the disk D that rotates together with the wheels. According to the piston nut 6 for converting the rotational force of the motor 5 driven by the ECU into linear movement force, and the inner pad assembly located on the surface of the opposite disk D on which the outer pad assembly 4 is located. It will be composed of a wedge assembly 7 coupled to 3).

This configuration using the wedge assembly 7 is also applied to the EWB which does not convert the rotational force of the motor into the piston nut.

In addition, the wedge caliper 1 is equipped with inner outer pad assemblies 3 and 4 arranged on both sides of the disk D rotating together with the wheels, and the disk D while covering the disk D portion. It consists of a torque member 2 that implements the interlocking action between the inner and outer pad assemblies 3 and 4 during pressurization.

In addition, the wedge caliper 1 is provided with side contact elastic plates 11 on both sides of the inner pad assembly 3, and the side contact elastic plates 11 are brought into close contact with the torque member 2 during braking. To this end, it consists of a friction pad type or a leaf spring type having a high elastic spring constant value.

The piston nut 6 has a moving shaft 6a for converting the rotational force of the motor 5 into linear motion, and a pressure block 6b for pressing the wedge assembly 7 at the end of the moving shaft 6a. It consists of.

Here, the axial movement method of the piston nut 6 is configured to move forward and backward in the axial direction according to the rotational direction of the motor rotation shaft, as the inner surface is coupled to the screw formed on the outer circumferential surface of the rotation shaft rotated together with the motor. The configuration is similar in construction to that typically used when implementing axial pull in an electric parking brake (EPB).

As such, the wedge assembly 7 mounted on the EMB of the present invention further applies a pressing force toward the disk D by the self-energizing action through normal operation, that is, relative movement of the pad through the disk D. In addition, even if the position movement of the wedge roller 9 is excessively generated due to abnormal control or error, the friction force of the wedge roller 9 is reduced to prevent wheel jamming from occurring. .

That is, when the ECU drives the motor 5 according to the electronic pedal operation as shown in FIG. 2 (a), the wedge assembly 7 moves forward with the piston nut 6 in the axial direction through the motor 5. When the wedge assembly 7 pushes the inner pad assembly 3 toward the disk D, the outer pad assembly 4 also acts as a torque member 2 of the wedge caliper 1 and the disk D. It is pushed toward) to generate braking force.

At this time, the side contact elastic plates 11 provided on both sides of the inner pad assembly 3 are in close contact with the torque member 2.

In this operation, the inner pad assembly 3 is pushed in the disk rotation direction by the rotational force of the disk D, and the wedge moving plate 8 coupled to the inner pad assembly 3 is also moved in the same direction. .

This allows the wedge roller 9 to have a fixed wedge base, as well as the frictional movement force of the wedge roller 9 through the rolling contact surface 8a of the wedge moving plate 8, as shown in FIG. 2 (b). Via the frictional force of the wedge roller 9 through the rolling contact surface 10a of the plate 10, the wedge roller 9 pushes the wedge moving plate 8 against the wedge base plate 10 toward the pad. To work.

Such a positional movement of the wedge roller 9 is converted into an input force for moving the inner pad assembly 3 toward the disk D, thereby causing the disk D of the inner pad assembly 3 to be moved. The pressing force against the force is not only the initial pressing force by the motor 5, but also the self-power force through the wedge phenomenon of the wedge assembly 7 due to the associated behavior between the rotating disk D and the inner pad assembly 3. The additional pressing force due to the self-energizing action is added.

This normal action is not achieved and due to abnormal control or error during operation, the wedge roller 9 is moved excessively, that is, as shown in FIG. 10a) When moved beyond the site to the extended rolling contact surfaces 8b, 10b, the magnitude of the frictional force generated by the wedge roller 9 is greater than the extended rolling contact surfaces 8b, As it is located at 10b).

The magnitude of the frictional force of the wedge roller 9 is reduced as the frictional force of the wedge roller 9 increases as the contact angle of the wedge roller 9 increases in magnitude, thereby forming an angle formed by the rolling contact surfaces 8a and 10a. An angle b formed by the extended rolling contact surfaces 8b and 10b is formed at a larger angle than a).

Accordingly, the wedge assembly 7 works so that wheel jamming does not occur due to excessive positional movement of the wedge roller 9 even if the EMB does not operate normally and abnormal control or error occurs.

As described above, according to the present invention, a wedge assembly used for an electro mechanical brake (EMB) or an electro wedge brake (EWB) to reinforce the disk pressing force of the pad is excessively moved in the wedge roller. By reducing the amount of friction generated, there is an effect that wheel jamming does not occur due to the wedge assembly even in an emergency where an error occurs in motor control during operation.

Claims (2)

Wedge caliper (1) surrounding the disk (D) portion that rotates with the wheel, and the motor (5) driven by the ECU that performs control through the operation signal of the electronic pedal, the rotational force generated from the motor (5) In the EMB (Electro Mechanical Brake) or EWB (Electro Wedge Brake), which is an electric wedge brake device composed of a wedge assembly 7 for pressing the pad toward the disc D through a conversion medium converting into a linear moving force, The wedge assembly (7) is coupled to the inner pad assembly (3) located to one side of the disk (D) and the wedge moving plate (8) moving together with the pad (3) interlocked with the disk (D), Wedge base plate 10 which is pressed against piston wedge 6 while being opposed to wedge moving plate 8 and The V grooves are more than when positioned on the rolling contact surfaces 8a and 10a having an angle a and an imaginary horizontal line in the cross section of the V grooves formed on the surfaces of the pair of plates 8 and 10 facing each other. The magnitude of the friction force is reduced when the virtual horizontal line of the cross section and the formed angle b form a larger angle than the angle a so as to be located on the extended rolling contact surfaces 8b and 10b which extend from the rolling contact surfaces 8a and 10a. The wheel jamming prevention type wedge assembly, characterized in that consisting of a wedge roller (9) for generating a wedge phenomenon (self-Energizing) effect is implemented to strengthen the disk (D) pressure of the pad. delete

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