KR20130102921A - Compensation apparatus for spindle tolerance of electro-mechanical brake system - Google Patents

Abstract

PURPOSE: A spindle tolerance compensation device of an electro-mechanical brake system is provided to reduce the uneven contact of a brake pad due to the different end positions of a plurality of spindles. CONSTITUTION: A spindle tolerance compensation device (300) of an electro-mechanical brake system (10) comprises a caliper body (310), a spindle (320), an inner pad (330), an outer pad (340), a fluid pressure compensation unit (350), a fluid pressure line, and a bleeding line. The spindle is installed on the caliper body and converts the rotary displacement of an actuator into a linear displacement. The inner pad is connected to the end of the spindle. The inner pad is linearly moved to a brake disk with the operation of the spindle which linearly moves. The outer pad is installed on the caliper body. The outer pad faces the inner pad with the brake disk between them. The fluid pressure compensation unit is made of a fluid pressure cylinder. The fluid pressure compensation unit is installed on the caliper body. The fluid pressure supports the outer pad towards the brake disk using fluid pressure. The fluid pressure line is a fluid passage to supply a working fluid to the fluid pressure compensation unit. The bleeding line is a fluid passage to discharge air from the inside of the fluid pressure compensation unit.

Description

Spindle Tolerance Compensation System for Electromechanical Brake System {COMPENSATION APPARATUS FOR SPINDLE TOLERANCE OF ELECTRO-MECHANICAL BRAKE SYSTEM}

The present invention relates to a spindle tolerance compensator of an electromechanical brake device, and more particularly, to a spindle tolerance compensator of an electromechanical brake device for reducing contact nonuniformity of a brake pad according to an end position difference between a plurality of spindles. .

In general, a brake is a brake device used to decelerate or stop a driving vehicle, and a friction type brake that generally uses a frictional force to brake the vehicle is used.

The hydraulic brake performs a braking function while the brake pads provided on both sides of the brake disk rotating together with the wheels are moved to the brake disk by hydraulic pressure.

The hydraulic brake has a complicated configuration consisting of a booster for boosting pedal operation force, a master cylinder, a wheel cylinder, a hydraulic line connected with the master cylinder and a wheel cylinder, and various devices for controlling each of these parts.

Accordingly, the electro-mechanical brake system (EMB system), which can realize a braking force by the driving force of the motor and can be implemented in a simpler structure than the hydraulic brake, can further enhance the reliability of the braking performance. have.

Related prior art is Korean Patent Publication No. 2010-0030010 (2010.03.18. Publication, the name of the invention: an electric brake device with a parking braking function).

An electromechanical brake device having a plurality of spindles is disclosed to reduce the load burden on the spindle for pushing the brake pads to the brake disc side and to implement the braking performance more stably.

However, due to manufacturing tolerances and assembly tolerances of the spindles, there is a problem in that the position of the spindle ends to which the brake pads are coupled does not coincide with each other, resulting in uneven contact (pressure) between the brake pads and the brake disks.

SUMMARY OF THE INVENTION An object of the present invention is to provide a spindle tolerance compensator of an electromechanical brake device capable of reducing contact nonuniformity of a brake pad according to end position differences between a plurality of spindles.

Spindle tolerance compensation device of the electromechanical brake device according to an embodiment of the present invention, the caliper body of the electromechanical brake device; A plurality of spindles installed in the caliper body and converting a rotational displacement of the actuator into a linear displacement; An inner pad linearly moved toward the brake disc by the operation of the spindle; An outer pad mounted to the caliper body and positioned to face the inner pad with the brake disc interposed therebetween; Hydraulic compensation means having a hydraulic cylinder structure is installed on the caliper body, the hydraulic compensation means for supporting the outer pad to the brake disk by the hydraulic pressure; A hydraulic line constituting a flow path for supplying a working fluid to the hydraulic compensation means; And a bleeding line constituting a flow path for discharging air in the hydraulic compensation means.

In the present invention, it characterized in that it comprises a cylinder formed to be recessed in the caliper body, the piston is inserted and installed in the cylinder portion, one end portion exposed to the outside of the cylinder portion is connected to the outer pad.

The hydraulic compensation means in the present invention, is installed around the inner peripheral portion of the cylinder portion, the O-ring in close contact with the outer peripheral surface of the piston portion; characterized in that it further comprises a.

The hydraulic line in the present invention, the fluid supply port which is open to the outer surface of the caliper body to supply the working fluid outside the caliper body to the hydraulic compensation means side; A supply passage extending from the fluid supply port to the hydraulic compensation means; And a connection passage connecting the plurality of hydraulic compensation means to communicate with each other.

The bleeding line in the present invention, the discharge port which is open to the outer surface of the caliper body to discharge the air in the hydraulic compensation means to the outside; And a discharge passage extending from the hydraulic compensation means to the discharge port.

According to the embodiment of the present invention, even if the inner pad is unevenly contacted with the brake disc due to the tolerance of each spindle, the contact unevenness can be compensated by the independent movement of each of the piston parts provided in the hydraulic compensation means.

As a result, by providing a plurality of spindles, it is possible to reduce the load on each spindle and increase durability, while stably realizing braking performance by contact between the brake pads (inner pads and outer pads) and the brake discs. Can be.

In addition, in the event of an abnormal operation of an actuator, a spindle, etc., when the hydraulic compensation means is operated, emergency braking can be realized by moving the outer pad toward the brake disc to pressurize it.

1 is a perspective view illustrating an electromechanical brake device to which a spindle tolerance compensation device of an electromechanical brake device according to an embodiment of the present invention is applied.
2 is a perspective view illustrating a state in which an outer pad is omitted in a spindle tolerance compensator of an electromechanical brake device according to an embodiment of the present invention.
3 is a perspective view illustrating an electromechanical brake device to which a spindle tolerance compensation device of the electromechanical brake device according to an embodiment of the present invention is applied from another direction.
4 is a partial cross-sectional view showing the spindle tolerance compensation device of the electromechanical brake device according to an embodiment of the present invention on the cross-sectional view taken along the line AA 'of FIG.
5 is a partial cross-sectional view showing the spindle tolerance compensation device of the electromechanical brake device according to an embodiment of the present invention on the cross-section line B-B 'of FIG.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the spindle tolerance compensation device of the electromechanical brake device according to the present invention.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

1 is a perspective view showing an electromechanical brake device to which the spindle tolerance compensation device of the electromechanical brake device according to an embodiment of the present invention is applied, and FIG. 2 is a spindle tolerance of the electromechanical brake device according to an embodiment of the present invention. A perspective view showing a state where an outer pad is omitted from a compensating device.

3 is a perspective view illustrating an electromechanical brake device to which a spindle tolerance compensation device of the electromechanical brake device according to an embodiment of the present invention is applied from another direction.

4 is a partial cross-sectional view showing the spindle tolerance compensation device of the electromechanical brake device according to an embodiment of the present invention in the cross-sectional view taken along the line AA 'of Figure 1, Figure 5 is a cross-sectional view taken along the line B-B' of FIG. Partial cross-sectional view showing a spindle tolerance compensation device of the electromechanical brake device according to an embodiment of the present invention.

1 and 4, the spindle tolerance compensation device 300 of the electromechanical brake device 10 according to an embodiment of the present invention, the caliper body 310, the spindle 320, the inner pad 330, It includes an outer pad 340, hydraulic compensation means 350, hydraulic line 360, bleeding line 370.

The electromechanical brake device 10 is a device that generates a braking force by a driving force of a motor, and has a structure including an operation pedal unit, a brake control unit, and a brake actuator.

The spindle tolerance compensator 300 of the electromechanical brake device 10 according to an embodiment of the present invention may be applied to a brake actuator (for example, a brake caliper) of the electromechanical brake device 10. have.

The brake caliper is a device that presses both sides of the brake disc 20 to restrain the rotation of the wheel (not shown) by the friction force.

The caliper body 310 forms a frame in which the actuator 315, the spindle 320, the inner pad 330, the outer pad 340, and the hydraulic compensation means 350 can be installed.

A plurality of spindle 320 is installed on the caliper body 310 on one side where the inner pad 330 is installed, and converts the rotational displacement of the actuator 315 (for example, a motor) into a linear displacement.

As described above, the structure of each of the spindles 320 for converting the rotational displacement of the actuator 315 into a linear displacement is disclosed by implementing a ball screw structure, and the like, and a detailed description thereof will be omitted. .

2 and 4, the plurality of spindles 320 are located at points opposite to each of the plurality of hydraulic compensation means 350.

Referring to FIG. 4, the inner pad 330 is connected to the end of the spindle 320 and linearly moved toward the brake disc 20 by the operation of the spindle 320 that is linearly moved (axially moved).

The outer pad 340 is installed on the caliper body 310 and is positioned to face the inner pad 330 with the brake disc 20 therebetween.

In the forward driving of the actuator 315, the plurality of spindles 320 are linearly moved at the same displacement toward the brake disc 20.

At this time, the inner pad 330 coupled to the ends of the plurality of spindles 320 is moved toward the brake disc 20, so that an interval between the inner pad 330 and the outer pad 340 is narrowed.

By moving the inner pad 330 as described above, the inner pad 330 and the outer pad 340 pressurize both surfaces of the brake disc 20 positioned between the inner pad 330 and the outer pad 340. Friction forces stop the rotation.

2 and 4, the hydraulic compensation means 350 has a hydraulic cylinder structure and a plurality of caliper body 310 is installed on the other side where the outer pad 340 is installed.

Ends of the plurality of hydraulic compensating means 350 are connected to the outer pad 340, and the hydraulic compensating means 350 is hydraulic at the outer pad 340 in a state where the outer pad 340 is in contact with the brake disc 20. ) Is supported by the brake disc 20 side.

Hydraulic compensation means 350 according to an embodiment of the present invention, the cylinder portion 351, the piston portion 352, O-ring 353.

The cylinder portion 351 is formed to be recessed on the caliper body 310 to form a cylindrical hollow portion having a constant diameter.

The piston part 352 has a circumferential shape having a diameter corresponding to the cylinder part 351 and is inserted and installed in the cylinder part 351, and is connected to the outer pad 340 when hydraulic pressure is formed in the cylinder part 351. Protrudes out of the cylinder portion 351.

The O-ring 353 is made of an elastic material such as rubber (for example, synthetic rubber), has a round ring shape, is installed around the inner circumference of the cylinder portion 351, and the inner circumference thereof is the piston portion 352. It is in close contact with the outer peripheral surface.

O-ring 353 is lubricated by the working fluid by the installation structure as described above, the working fluid inside the cylinder portion 351 through the opening of the cylinder portion 351 without hindering the reciprocating movement of the piston 352 It is sealed to prevent loss.

On the other hand, a sealing member is installed between the caliper and the spindle member of the electric parking brake device (EPB) to prevent leakage of brake oil, and is sealed by repeated friction generated by the rotational movement of the spindle member. Inner and outer circumference of the wear.

When the sealing member is worn, a gap is generated between the sealing member and the caliper, between the sealing member and the spindle member, and leakage occurs accordingly, so that the electronic parking brake apparatus has a complicated structure to compensate for the wear of the sealing member.

On the other hand, since the hydraulic compensation means 350 does not generate wear of the O-ring 353 due to the structure of the cylinder part 351, the piston part 352, and the O-ring 353 as described above (durability can be ensured) ), It can be manufactured and applied more easily and compactly without having a complicated structure such as an electronic parking brake device.

1 and 5, the hydraulic line 360 forms a flow path for supplying a working fluid to the hydraulic compensation means (350).

The hydraulic line 360 according to an embodiment of the present invention includes a fluid supply port 361, a supply passage 362, and a connection passage 363.

Referring to FIG. 3, the fluid supply port 361 is provided at an outer surface of the caliper body 310 to supply a working fluid (for example, brake oil) outside the caliper body 310 to the hydraulic compensation means 350. Is open.

The supply passage 362 forms a passage extending from the fluid supply port 361 to one of the hydraulic compensation means 350.

The working fluid injected into the hydraulic line 360 through the fluid supply port 361 is supplied into the hydraulic compensating means 350, more specifically, the cylinder part 351 through the supply passage 362.

The connection flow path 363 forms a flow path for connecting the plurality of hydraulic compensation means 350 to communicate with each other.

The working fluid injected into one of the hydraulic compensating means 350 through the supply passage 362 is supplied to the other hydraulic compensating means 350 through the connecting passage 363.

When the working fluid is supplied to the fluid supply port 361, the working fluid is introduced into one of the hydraulic compensating means 350 through the supply flow path 362, and the other hydraulic compensating means 350 is connected through the connection flow path 363. It flows inward continuously.

By the supply of the working fluid as described above, the working fluid may be filled in all of the plurality of hydraulic compensation means (350).

Since the plurality of hydraulic compensating means 350 is maintained in communication with each other by the connection flow path 363, the plurality of hydraulic compensating means in a state in which the working fluid is filled in all the plurality of hydraulic compensating means 350 as described above The internal hydraulic pressure of all 350 is the same.

When the working fluid is injected into the cylinder part 351 of the hydraulic compensating means 350 through the hydraulic line 360, the end of the piston part 352 is external to the cylinder part 351 by the hydraulic pressure inside the cylinder part 351. It will be withdrawn.

At this time, when both surfaces of the brake disc 20 are pressed by the inner pad 330 and the outer pad 340, the piston parts 352 of each of the hydraulic compensation means 350 are brake disc 20 and the outer pad 340. It moves to the inside of the cylinder part 351 by the contact force of the contact.

In the case of having a plurality of spindles 320, the end position of the spindles 320 may be minutely different (1 mm or less) due to manufacturing, assembly tolerances, etc., and the inner pad 330 and the brake disc 20 The contact between them is not uniform.

For example, when the inner pad 330 connected to the ends of two spindles 320 contacts the brake disc 20 in an inclined state due to an end position difference of the spindles 320, the inner pad 330 may have a brake disc. There is a part that is strongly pressed (closely) to the part 20 and a part that is weakly pressed.

For this reason, the outer pad 340 positioned opposite to each other with the brake disc 20 interposed therebetween is momentarily pressed against the brake disc 20 by a portion stronger than the reference value (hydraulic compensator 350). There is a part.

When a portion of the outer pad 340 positioned to correspond to the end of the piston portion 352 is pressed against the brake disc 20 more strongly than the reference value, the piston portion 352 of the hydraulic compensation means 350 naturally has a cylinder portion ( 351 is pushed into the interior.

At this time, the piston part 352 moves according to the degree of contact F1 between the outer pad 340 and the brake disc 20 and the difference F1-F2 between the hydraulic pressure compensation means 350 and the internal hydraulic pressure F2. The displacement is different.

That is, the larger the difference (F1-F2) between the contact pressing force between the outer pad 340 and the brake disc 20 and the hydraulic pressure inside the hydraulic compensation means 350, the more the displacement of the piston 352 increases.

By the above-described action, the piston parts 352 provided in each of the hydraulic compensation means 350 are independently moved to different displacements.

Even if the inner pad 330 is unevenly contacted with the brake disc 20 due to the tolerance of each of the spindles 320, such contact unevenness can be compensated for by the movement of the piston part 352 as described above. The braking performance of) can be achieved stably.

Even in the process in which the movement of the piston 352 occurs as described above, since the inside of the plurality of hydraulic compensation means 350 maintains the same hydraulic pressure by the connection flow path 363, the outer pad 340 and the brake disc 20 The contact force between the poles is kept uniform over the entire surface.

On the other hand, when the actuator 315, the spindle 320, or other abnormal operation, when operating the hydraulic compensation means 350 may move the outer pad 340 to the brake disk 20 side by pressing contact to implement emergency braking.

3 and 5, the bleeding line 370 forms a flow path for discharging air inside the hydraulic compensation means 350.

The bleeding line 370 according to the exemplary embodiment of the present invention includes a discharge port 371 and a discharge flow 372.

The discharge port 371 is open to the outer surface of the caliper body 310 on the side opposite to the fluid supply port 361 so as to discharge the air in the hydraulic compensation means 350 to the outside.

The discharge flow path 372 extends from the hydraulic compensation means 350 that receives the working fluid by the connection flow path 363 of the plurality of hydraulic compensation means 350 to the discharge port 371.

When the working fluid is supplied into the hydraulic compensating means 350, the air in the hydraulic compensating means 350 and the hydraulic line 360 is pushed by the working fluid through the discharge passage 372 to the caliper body through the discharge port 371. 310 is discharged and removed to the outside.

The bleeding line 370 first injects the working fluid into the hydraulic compensation means 350 and the hydraulic line 360, or repairs and replaces the hydraulic compensation means 350, and then reinjects the working fluid, and the hydraulic compensation means 350. And it can be used for the bleeding (Bleeding) operation to remove the air in the hydraulic line 360.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. Accordingly, the technical scope of the present invention should be defined by the following claims.

10 electromechanical brake device 20 brake disc
300: spindle tolerance compensation device 310: caliper body
315: actuator 320: spindle
330: inner pad 340: outer pad
350: hydraulic compensation means 351: cylinder portion
352: piston 353: O-ring
360: Hydraulic line 361: Fluid supply port
362 supply flow path 363 connection flow path
370: bleeding line 371: discharge port
372: discharge passage

Claims (5)

Caliper body of electromechanical brake device;
A plurality of spindles installed in the caliper body and converting a rotational displacement of the actuator into a linear displacement;
An inner pad linearly moved toward the brake disc by the operation of the spindle;
An outer pad mounted to the caliper body and positioned to face the inner pad with the brake disc interposed therebetween;
Hydraulic compensation means having a hydraulic cylinder structure is installed on the caliper body, the hydraulic compensation means for supporting the outer pad to the brake disk by the hydraulic pressure;
A hydraulic line constituting a flow path for supplying a working fluid to the hydraulic compensation means; And
A bleeding line constituting a flow path for discharging air in the hydraulic compensation means;
Spindle tolerance compensation device of the electromechanical brake device comprising a.
The method of claim 1,
The hydraulic compensation means,
A cylinder portion formed to be recessed in the caliper body; And
A piston portion inserted into the cylinder portion and having one end portion exposed to the outside of the cylinder portion connected to the outer pad;
Spindle tolerance compensation device of the electromechanical brake device comprising a.
The method of claim 2,
The hydraulic compensation means,
An o-ring installed around the inner circumferential portion of the cylinder portion and in close contact with an outer circumferential surface of the piston portion;
Spindle tolerance compensation device of the electromechanical brake device further comprises.
The method of claim 1,
The hydraulic line,
A fluid supply port which is open to an outer surface of the caliper body to supply a working fluid outside the caliper body to the hydraulic compensation means;
A supply passage extending from the fluid supply port to the hydraulic compensation means; And
A connection passage connecting a plurality of the hydraulic compensation means to be in communication with each other;
Spindle tolerance compensation device of the electromechanical brake device comprising a.
The method of claim 1,
The bleeding line,
A discharge port that is open to an outer surface of the caliper body to discharge air inside the hydraulic compensation means to the outside; And
A discharge passage extending from the hydraulic compensation means to the discharge port;
Spindle tolerance compensation device of the electromechanical brake device comprising a.

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