KR20220099863A - Brake pad abrasion detection apparatus for vehicle - Google Patents

Abstract

Disclosed is a brake pad abrasion detection device for a vehicle. According to the present invention, the brake pad abrasion detection device for a vehicle comprises: a carrier unit fixated to a vehicle body; a caliper unit movably installed in the carrier unit; a compression driving unit installed to be moved forward and backward in the caliper unit and compressing a brake pad unit to move the caliper unit; a movement guide unit connected to the caliper unit to be moved with the caliper unit together and movably coupled to the carrier unit; and a movement distance measurement unit installed in the carrier unit to measure a moving distance of the movement guide unit to measure an abrasion state of the brake pad unit.

Description

Brake pad wear detection device for vehicle {BRAKE PAD ABRASION DETECTION APPARATUS FOR VEHICLE}

The present invention relates to an apparatus for detecting brake pad wear for a vehicle, and more particularly, to a brake pad for a vehicle capable of reducing maintenance costs by measuring the replacement timing of a brake pad part in a non-contact manner and preventing a reduction in the braking area of the brake pad part It relates to a wear detection device.

BACKGROUND ART In general, a vehicle brake device is a device used to decelerate or stop a vehicle, and generally uses a friction brake that attenuates kinetic energy of a vehicle using frictional force. These friction brakes are divided into drum brakes and disc brakes. The disc brake converts the rotational force of the drive motor into linear motion using a screw and nut mechanism to pressurize the piston, and the brake pad, a friction material, is pressed against the disc by the movement of the caliper by the pressing force of the piston and the reaction force of the piston to apply braking force. create After braking, the friction force is removed by separating the caliper and the piston from the brake pad using the knock back phenomenon between the brake pad and the disc and the restoring force of the piston seal (Roll Back phenomenon).

Since the brake pad operated in this way has abrasiveness, the amount of wear increases as the number of braking times and braking time during driving of the vehicle increase. Although various technologies have been developed to measure the wear amount of the brake pad, the conventional brake pad wear detection device forms an installation hole in the brake pad and installs the wear indicator in the installation hole, so that the wear indicator is similar to the brake pad. worn out Therefore, since the brake pad and the wear indicator must be replaced together, there is a problem in that the maintenance cost of the vehicle is increased. In addition, there is a problem in that the braking area of the brake pad may be reduced as much as the area in which the wear indicator and the installation hole are formed in the brake pad.

Background art of the present invention is disclosed in Korean Patent Application Laid-Open No. 10-1998-0022913 (published on July 6, 1998, title of the invention: Brake pad wear alarm device for automobile).

SUMMARY OF THE INVENTION It is an object of the present invention to provide a brake pad wear detection device for a vehicle capable of reducing maintenance costs by measuring the replacement timing of a brake pad part in a non-contact manner and preventing a reduction in the braking area of the brake pad part.

A vehicle brake pad wear detection apparatus according to the present invention includes: a carrier part fixed to a vehicle body; a caliper unit movably installed in the carrier unit; a pressure driving unit installed in the caliper unit to move forward and backward and pressing a brake pad unit to move the caliper unit; a movement guide part connected to the caliper part so as to move together with the caliper part and movably coupled to the carrier part; and a moving distance measuring unit installed in the carrier unit to measure the moving distance of the moving guide unit to measure the wear state of the brake pad unit.

a guide rod part connected to the movement guide part and slidably coupled to the carrier part; and a magnet part connected to the guide rod part so that the movement distance measuring part detects a magnetic force.

A guide groove portion may be formed in the carrier portion to be slidably coupled to the guide rod portion, and the movement distance measuring portion may be disposed to be spaced apart from the magnet portion by a predetermined distance in a longitudinal direction of the guide rod portion.

The magnet part may be connected to an end of the guide rod part.

The movement guide part may further include a bush part installed between an end of the guide rod part and the magnet part.

A buffer groove portion may be formed on the outer surface of the bush portion along the periphery of the bush portion.

The moving distance measuring unit may measure the moving distance of the moving guide unit by sensing the magnetic force strength of the magnet unit.

The vehicle brake pad wear detection device may further include a restoration unit connected to the guide rod unit and the caliper unit, and configured to move the caliper unit to an original position as the pressure driving unit releases the pressure of the brake pad unit.

According to the present invention, since the moving distance measuring unit measures the moving distance of the moving guide in a state in which the moving guide is not in contact with the moving guide, it is possible to prevent the moving distance measuring unit from being worn by the moving guide.

In addition, according to the present invention, since it is not necessary to mount a wear indicator on the brake pad portion, the friction area of the brake pad portion may be relatively increased. Accordingly, the braking force of the brake pad portion can be further improved.

1 is a perspective view schematically illustrating a brake pad wear detection apparatus for a vehicle according to an embodiment of the present invention.
2 is an enlarged view schematically illustrating a movement guide unit and a movement distance measurement unit in the brake pad wear detection apparatus for a vehicle according to an embodiment of the present invention.
3 is a cross-sectional view schematically illustrating an apparatus for detecting wear of a brake pad for a vehicle according to an embodiment of the present invention.
4 is a cross-sectional view schematically illustrating a movement guide unit and a movement distance measurement unit in the brake pad wear detection apparatus for a vehicle according to an embodiment of the present invention.
5 is a perspective view schematically illustrating a movement guide part in the brake pad wear detection apparatus for a vehicle according to an embodiment of the present invention.
6 is an exploded perspective view schematically illustrating a movement guide part in the brake pad wear detection apparatus for a vehicle according to an embodiment of the present invention.
7 is a cross-sectional view schematically illustrating a state in which a movement distance of a movement guide unit is increased when the brake pad unit is braked when the brake pad unit is worn in the brake pad wear detection apparatus for a vehicle according to an embodiment of the present invention.

Hereinafter, an embodiment of a vehicle brake pad wear detection apparatus according to the present invention will be described with reference to the accompanying drawings. In the process of describing the brake pad wear detection device for a vehicle, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users and operators. Therefore, definitions of these terms should be made based on the content throughout this specification.

1 is a perspective view schematically illustrating an apparatus for detecting wear of a brake pad for a vehicle according to an embodiment of the present invention, and FIG. 2 is a movement guide part and measurement of a movement distance in the apparatus for detecting wear of a brake pad for a vehicle according to an embodiment of the present invention. It is an enlarged view schematically showing a part, FIG. 3 is a cross-sectional view schematically illustrating a vehicle brake pad wear detection device according to an embodiment of the present invention, and FIG. 4 is a vehicle brake pad wear detection device according to an embodiment of the present invention A cross-sectional view schematically showing a movement guide unit and a movement distance measuring unit in the device, FIG. 5 is a perspective view schematically illustrating a movement guide unit in the brake pad wear detection device for a vehicle according to an embodiment of the present invention, and FIG. 6 is the present invention is an exploded perspective view schematically illustrating a movement guide part in the brake pad wear detection device for a vehicle according to an embodiment of the present invention.

1 to 6 , the brake pad wear detection apparatus 100 for a vehicle according to an embodiment of the present invention includes a carrier part 110 , a caliper part 120 , a pressure driving part 140 , and a movement guide part 150 . ) and a moving distance measuring unit 160 .

The carrier part 110 is fixed to the vehicle body. The carrier part 110 supports the movement guide part 150 and the caliper part 120 . The carrier part 110 may be fixed to the knuckle of the vehicle body through a mounting bolt or the like. The carrier part 110 may include a material of high rigidity, such as steel, to sufficiently withstand the load transmitted from the caliper part 120 and the movement guide part 150 . The carrier part 110 may be formed in various shapes that can be fixed to the vehicle body.

The caliper part 120 is movably installed in the carrier part 110 . The caliper unit 120 includes a caliper body unit 121 movably supported by the carrier unit 110 , and boss units 123 extending on both sides of the caliper body unit 121 . The caliper part 120 forms a schematic appearance of the brake pad wear detection device 100 for a vehicle.

The pressure driving unit 140 is installed in the caliper unit 120 to move forward and backward, and presses the brake pad unit 130 to move the caliper unit 120 . The pressure driving unit 140 is installed behind the caliper unit 120 and generates a driving force. The pressure driving unit 140 is connected to the pressing unit (not shown) to transmit a driving force to the pressing unit. The pressurization driving unit 140 includes an electric motor for generating rotational power by receiving power from a battery of the vehicle, and a reducer connected to the electric motor. The reducer may include any one of a planetary gear assembly structure, a spur gear assembly structure, and a worm and worm wheel gear assembly structure.

The pressure driving unit 140 is rotated by the pressure driving unit 140, and a spindle (not shown) having a thread on the outer circumferential surface, and a nut screwed to the spindle to move forward and backward according to the rotation direction of the spindle (not shown), It may include a piston (not shown) for pressing or releasing the pressure of the brake pad unit 130 in association with the movement of the nut.

The movement guide unit 150 is connected to the caliper unit 120 to move together with the caliper unit 120 , and is movably coupled to the carrier unit 110 .

The moving distance measuring unit 160 is installed in the carrier unit 110 to measure the wear state of the brake pad unit 130 by measuring the moving distance of the moving guide unit 150 . If the wear amount of the brake pad unit 130 is increased, the distance that the caliper unit 120 moves toward the pressure driving unit 140 when the pad plate unit brakes the disk 10 is increased. In this case, since the moving distance measuring unit 160 is installed in the carrier unit 110 , the moving distance measuring unit 160 maintains a stopped state when the caliper unit 120 moves.

As the movement distance of the caliper unit 120 increases, the movement distance L1 (refer to FIG. 7 ) of the movement guide unit 150 increases, and the movement distance measurement unit 160 measures the movement distance of the movement guide unit 150 . measure The control unit calculates the amount of wear of the pad plate by calculating the signal transmitted from the movement distance measuring unit 160 , and notifies the driver through the display unit (not shown) when the amount of wear is greater than or equal to a preset amount of wear. Accordingly, the driver can easily recognize the replacement timing of the brake pad unit 130 . In addition, since the moving distance measuring unit 160 measures the replacement timing of the brake pad unit 130 in a non-contact manner, it is possible to prevent wear of the moving distance measuring unit 160 and reduce maintenance costs. In addition, since there is no need to provide a space in the brake pad unit 130 to install the movement distance measuring unit 160 , the braking area of the brake pad unit 130 may be relatively increased.

The movement guide unit 150 is connected to the caliper unit 120 , the guide rod unit 151 is slidably coupled to the carrier unit 110 , and the guide rod unit to sense the magnetic force in the movement distance measurement unit 160 . and a magnet part 155 connected to 151 . The guide rod part 151 is formed in a circular rod shape as a whole, and the outer surface of the magnet part 155 has the same or almost the same outer diameter as the outer surface of the guide rod part 151 . At this time, as the movement guide unit 150 is moved by the caliper unit 120 , the distance between the magnet unit 155 and the movement distance measurement unit 160 is changed.

When the brake pad part 130 is not worn or slightly worn, the moving distance between the magnet part 155 and the guide rod part 151 is relatively reduced. At this time, since the distance between the magnet unit 155 and the movement distance sensing unit is relatively reduced, the magnetic force sensed by the movement distance sensing unit is relatively small. On the other hand, when the thickness of the brake pad unit 130 is reduced as the brake pad unit 130 is heavily worn, the magnet unit 155 and the guide rod unit 151 are separated by the worn thickness of the brake pad unit 130 . Since the moving distance is relatively increased, the magnet unit 155 is moved closer to the moving distance measuring unit 160 . In this case, the magnetic force sensed by the movement distance sensing unit is relatively increased. Accordingly, the wear level of the brake pad unit 130 may be calculated based on the magnetic force detected by the movement distance measuring unit 160 .

A guide groove part 112 is formed in the carrier part 110 so that the guide rod part 151 is slidably coupled thereto, and the movement distance measuring part 160 moves in the longitudinal direction of the guide rod part 151 in the magnet part 155 . are spaced apart from each other by a predetermined distance. The inner surface of the guide groove part 112 is processed smoothly to reduce frictional force with the guide rod part 151 . The guide groove part 112 is formed parallel to the movement direction of the caliper part 120 . Accordingly, when the brake pad unit 130 brakes the disc 10 , the caliper unit 120 and the guide rod unit 151 are moved to the right by the moving distance of the brake pad unit 130 .

The magnet part 155 is connected to an end of the guide rod part 151 . At this time, the first fastening part 152 is formed to be stepped at the end of the guide rod part 151 , and the magnet part 155 is coupled to the first fastening part 152 . The diameter of the first fastening part 152 is formed smaller than the diameter of the guide rod part 151 .

The movement guide part 150 further includes a bush part 157 installed between the end of the guide rod part 151 and the magnet part 155 . The bush part 157 is formed of a synthetic resin material having elasticity, such as rubber. At this time, the second fastening part 153 is formed to be stepped at the end of the movement guide part 150 , and the bushing part 157 is coupled to the second fastening part 153 . The diameter of the second fastening part 153 is larger than the diameter of the first fastening part 152 and smaller than the diameter of the guide rod part 151 .

Since the bush portion 157 is formed of an elastic material, it is possible to absorb an impact applied to the guide rod portion 151 . In addition, since the bush part 157 is disposed between the magnet part 155 and the ends of the guide rod part 151 to reduce the influence of the magnetic field, the magnetic force of the magnet part 155 in the moving distance measuring part 160 is stabilized. can be measured very well. Accordingly, it is possible to reduce the magnetic force measurement error of the moving distance measuring unit 160 .

A buffer groove 158 is formed on the outer surface of the bush portion 157 along the circumference of the bush portion 157 . The buffer groove 158 is formed in a ring shape. A plurality of buffer groove portions 158 are disposed along the longitudinal direction of the guide rod portion 151 . Accordingly, when an impact is applied to the guide rod part 151 or the magnet part 155 , the bush part 157 is contracted to absorb the shock.

The moving distance measuring unit 160 measures the moving distance of the moving guide unit 150 by sensing the magnetic force strength of the magnet unit 155 . The moving distance measuring unit 160 includes a plurality of Hall sensor units 162 . Since the moving distance measuring unit 160 measures the moving distance of the moving guide unit 150 while not in contact with the moving guide unit 150 , the moving distance measuring unit 160 is worn by the moving guide unit 150 . can be prevented from becoming In addition, since it is not necessary to mount a wear indicator on the brake pad unit 130 , the friction area of the brake pad unit 130 may be relatively increased. Accordingly, the braking force of the brake pad unit 130 may be further improved.

The vehicle brake pad wear detection apparatus 100 is connected to the guide rod unit 151 and the caliper unit 120 , and as the pressure driving unit 140 releases the pressure of the brake pad unit 130 , the caliper unit 120 is moved to its original position. It further includes a restoration unit 170 to move to. The restoration unit 170 slides and moves the caliper unit 120 by elastic energy accumulated by deformation when the brake pad unit 130 is depressurized to return the caliper unit 120 to its initial position. The restoration unit 170 may include a flexible material such as rubber or silicone to be elastically deformable. Accordingly, the restoration unit 170 may prevent a drag phenomenon occurring due to the non-separation of the disc 10 and the brake pad unit 130 .

The restoration unit 170 includes a blocking unit 171 and a deformable unit 173 .

The blocking part 171 is formed in a corrugated structure or a bellows structure that can be stretched in the longitudinal direction. The blocking part 171 is connected to the opposite side of the magnet part 155 in the guide rod part 151 . The blocking part 171 is connected to the guide rod part 151 and the boss part 123 of the caliper part 120 to block foreign substances from entering between the guide rod part 151 and the caliper part 120 . The blocking part 171 may prevent the slide performance of the guide rod part 151 and the caliper part 120 from being deteriorated.

In addition, the deformable part 173 extends from the blocking part 171 , is connected to the coupling groove 114 provided inside the caliper part 120 , and interlocks with the movement of the caliper part 120 . and change form. Both sides of the deformable part 173 are in close contact with the caliper part 120 and the guide rod part 151 , respectively, to limit relative movement with respect to the caliper part 120 and the guide rod part 151 . Accordingly, the deformable unit 173 may further strengthen the sealing performance of the restoration unit 170 , and convert all the movement amount of the caliper unit 120 into elastic energy, thereby returning the caliper unit 120 to its original position more quickly. can do it

The operation of the brake pad wear detection apparatus for a vehicle according to an embodiment of the present invention configured as described above will be described.

7 is a cross-sectional view schematically illustrating a state in which a movement distance of a movement guide unit is increased when the brake pad unit is braked when the brake pad unit is worn in the brake pad wear detection apparatus for a vehicle according to an embodiment of the present invention.

Referring to FIG. 7 , when the wheel is braked, as the pressure driving unit 140 is driven, the brake pad unit 130 is compressed on both sides of the disc 10 . As the brake pad 130 rubs against the disk 10 , the wheel is braked. As the brake pad unit 130 rubs against the disc 10 , the brake pad unit 130 may be worn.

When the brake pad unit 130 is moved to be pressed against the disc 10 , the caliper unit 120 is moved toward the pressure driving unit 140 . At this time, the caliper unit 120 slides toward the pressure driving unit 140 along with the movement guide unit 150 by a reaction force acting in the opposite direction to the pressing force of the pressure driving unit 140 . As the movement guide unit 150 is moved, the magnet unit 155 is moved toward the movement distance measurement unit 160 , and the movement distance measurement unit 160 detects the magnetic force of the magnet unit 155 , and controls the detection signal. send to

When the brake pad unit 130 is heavily worn, the thickness of the brake pad unit 130 is reduced. In this case, the caliper unit 120 is further moved toward the pressure driving unit 140 by the worn thickness of the brake pad unit 130 , and the movement guide unit 150 is also moved together with the caliper unit 120 . As the movement distance L1 of the caliper part 120 is relatively increased, the movement distance L1 of the magnet part 155 and the guide rod part 151 is relatively increased, so that the magnet part 155 measures the movement distance. It is moved closer to the part 160 . In this case, the magnetic force sensed by the movement distance sensing unit is relatively increased. When it is determined that the magnetic force strength detected by the movement distance measuring unit 160 is equal to or greater than the magnetic force value preset in the controller, the controller notifies the replacement timing of the brake pad unit 130 through the display unit.

When the pressure driving unit 140 releases the pressure of the brake pad unit 130 , the reaction force applied to the caliper unit 120 is also released. As the reaction force applied to the caliper part 120 is released, the deformable part 173 is restored to its initial shape by the accumulated elastic energy. The caliper part 120 is returned to its original position by the elastic restoring force of the deformable part 173 .

Although the present invention has been described with reference to the embodiment shown in the drawings, this is merely exemplary, and it is understood that various modifications and equivalent other embodiments are possible by those of ordinary skill in the art. will understand

Accordingly, the true technical protection scope of the present invention should be defined by the claims.

10: disc 100: vehicle brake pad wear detection device
110: carrier portion 112: guide groove portion
114: coupling groove 120: caliper part
121: caliper body portion 123: boss portion
130: brake pad unit 140: pressure driving unit
150: movement guide portion 151: guide rod portion
152: first fastening part 153: second fastening part
154: fastening bolt portion 155: magnet portion
156: fastening groove 157: bush
157a: insertion hole portion 158: buffer groove portion
160: moving distance measuring unit 162: Hall sensor unit
170: restoration unit 171: blocking unit
173: deformation part

Claims (8)

a carrier part fixed to the vehicle body;
a caliper unit movably installed in the carrier unit;
a pressure driving unit installed in the caliper unit to move forward and backward and pressing the brake pad unit to move the caliper unit;
a movement guide unit connected to the caliper unit to move together with the caliper unit and movably coupled to the carrier unit; and
and a moving distance measuring unit installed in the carrier unit to measure a moving distance of the moving guide unit to measure a wear state of the brake pad unit.
According to claim 1,
The movement guide unit,
a guide rod connected to the caliper and slidably coupled to the carrier; and
and a magnet part connected to the guide rod part so as to sense a magnetic force in the movement distance measuring part.
3. The method of claim 2,
A guide groove portion is formed in the carrier portion so that the guide rod portion is slidably coupled,
The moving distance measuring unit is a brake pad wear detection device for a vehicle, characterized in that the magnet unit is disposed to be spaced apart a predetermined distance in the longitudinal direction of the guide rod unit.
4. The method of claim 3,
The magnet portion is a brake pad wear detection device for a vehicle, characterized in that connected to the end of the guide rod portion.
4. The method of claim 3,
Brake pad wear detection apparatus for a vehicle, characterized in that it further comprises a bush portion installed between the end of the guide rod portion and the magnet portion.
6. The method of claim 5,
Brake pad wear detection device for a vehicle, characterized in that the buffer groove is formed along the periphery of the bush on the outer surface of the bush portion.
4. The method of claim 3,
The moving distance measuring unit detects the magnetic force strength of the magnet unit to measure the moving distance of the moving guide unit.
4. The method of claim 3,
and a restoration part connected to the guide rod part and the caliper part and configured to move the caliper part to its original position as the pressure driving part releases the pressure of the brake pad part.

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