KR101341621B1 - Improvement of braking distance, and dust ventilator and radiation heating type disk brake - Google Patents

Abstract

The present invention relates to a brake disc used in a disc brake braking device of a vehicle, and more particularly, to improve braking performance through the surface structure of a brake disc and to quickly discharge dust generated in braking, while simultaneously transferring heat in the circumferential direction. It relates to a shortening of the braking distance to prevent overheating and to increase the dust exhaust and heat dissipation area of the brake disc.
The present invention includes a brake disc rotor (200) comprising a main body (230) including a boss (210) coupled to a drive shaft of a car and a disk (220) formed in the radial direction of the outer circumferential surface of the boss (210); It is formed so as to have a length on the surface of the disk 220 along the circumferential direction about the rotation center of the disk 220 and distributed in a spaced apart position on the surface of the disk 220 to contact the pad 100. A plurality of grooves 300 forming contact surfaces a1 and non-contact surfaces a2; It is formed on the end of the groove 300, the exhaust tip 310 for scattering the fluid; including improved braking properties and dust exhaust and heat dissipation area expansion brake disk.

Description

Brake Discs with Improved Braking and Dust Exhaust and Heat Dissipation Areas {IMPROVEMENT OF BRAKING DISTANCE, AND DUST VENTILATOR AND RADIATION HEATING TYPE DISK BRAKE}

The present invention relates to a brake disc used in a disc brake braking device of a vehicle, and more particularly, to improve braking performance through the surface structure of a brake disc and to quickly discharge dust generated in braking, while simultaneously transferring heat in the circumferential direction. It relates to a shortening of the braking distance to prevent overheating and to increase the dust exhaust and heat dissipation area of the brake disc.

The disc brake brake system of the car is designed to rotate disc-shaped steel cast iron brake discs integrally with the wheels and to push both sides of the brake discs to brake pads operated by hydraulic pistons to brake or stop the car by its frictional force. Device.

The disc brake type brake system rotates while the disc is exposed to the air, so the heat dissipation is good and the braking force is stable. Since there is little magnetic backing force, the braking force is relatively stable without changing the braking force and braking. It was mainly used as a brake for the front wheel of a car.

In general, a disc brake type brake device is fixed to an axle or strut when viewed from the outside, and includes a hydraulic piston operated by the pedal pedal's pedaling force, a caliper having a pair of brake pads pressed by the hydraulic piston, and a caliper. It consists of a brake disk which is integrally rotated with the drive shaft by being coupled to the drive shaft by the hub with a part of the edge inserted between both pads therein.

When the brake pedal of the car is pressed, the hydraulic device acting on the pedaling force sends hydraulic pressure to the hydraulic piston, and the hydraulic piston compresses in the direction facing the pads on both sides. Braking the wheels by suppressing rotation.

During brake operation, the brake disc generates high temperatures due to friction with the pads. High heat reduces the braking efficiency of the brake system and causes thermal deformation of the brake discs, shortening their life.

Transmission of the braking force results in partial wear or bending due to contact of the brake disc surface with the brake pads.

Abnormal wear of the brake disc surface reduces braking and increases the braking distance.

In addition, brake pedal tremors, vehicle body tilts, and braking noises occur. Steering wheel tremors also occur at low speeds, which impedes safe driving.

According to the technique disclosed in Korean Patent Registration No. 10-0964322, a technique related to a polishing apparatus that enables re-use after polishing a surface of a brake disc that has been worn or abnormally deformed is known.

Thermal deformation and wear on the brake disc are mainly shown in the solid brake disc 10 type as shown in FIG. 1 having low heat resistance and heat dissipation.

Ventilated brake disc 20 has been proposed as an improved type to lower the deformation caused by heat by having a heat dissipation groove 21 or a vent hole 22 as shown in FIG. 2.

Ventilator-type brake disc 20 is formed in the form of a radial heat dissipation groove 21 in the circumferential direction in which the front and rear plates are tightly integrated in order to prevent fade and improve durability. It improves the cooling effect.

Korean Patent Laid-Open Publication No. 1998-073596 discloses a technique for reducing heat transfer on a brake disc by forming a plurality of vent holes radially arranged from the center of the brake disc to block heat transfer in the circumferential direction of the brake disc to prevent overheating.

Korean Patent Application No. 1996-0029825 discloses a brake disc for an automobile. This technique has a configuration in which a disk brake is formed with a plurality of air distribution means on the disk surface which is in direct contact with the friction pad.

Various known conventional brake disc technologies have the following problems.

The surface of the brake disc is smooth, showing a slip phenomenon with respect to the frictional force of the pad. Therefore, the initial frictional response to the brake braking force is low.

Since the drainage rate of the brake disc surface is low, the frictional force of the pad decreases when driving in rainy weather or when driving on wet roads, which reduces the braking performance of the brake system. In addition, the disk surface dust generated from the pad wear is not discharged quickly, which provides the cause of the disk wear.

Since a solid brake disc or a ventilator type brake disc is easily heated by circumferential heat transfer due to rotation in common, there is a problem of lowering the braking rate of the brake device from the beginning of operation.

Brake discs having heat-dissipating grooves or vent holes improve the release characteristics of frictional heat when the kinetic energy of the disc is converted into frictional heat energy, but the durability of the brake discs can be drastically degraded by the grooves or vent holes. There is this.

For example, the characteristics of the brake disc may affect elastic modulus, thermal expansion coefficient, high temperature dimensional stability, tensile strength, and the like, which may result in a decrease in stability that is generally contrary to the performance improvement of the brake disc.

In addition, in order to reduce the weight of the brake disc and improve heat dissipation characteristics, the rotor of the brake disc may be manufactured using an aluminum material.

Patent Documents 1. Republic of Korea Patent No. 0888821. Patent Document 2. Republic of Korea Patent Publication No. 1998-073596. Patent Document 3. Korean Patent Application No. 1996-0029825.

The present invention was devised to solve the problems of the prior art, and an object of the present invention is to change the surface structure of the brake disc to a structure that increases the friction force associated with the brake braking to reduce the slip with the brake pads, thereby reducing the initial brake braking force. An object of the present invention is to provide a brake disc capable of improving braking performance by increasing responsiveness.

It is another object of the present invention to provide a brake disc which improves the surface drainage of the brake disc and the dust exhaust performance to reduce the frictional force of the pad and at the same time suppress the piece wear of the disc.

Still another object of the present invention is to provide a brake disc which prevents a decrease in the initial braking rate of the brake device due to heat transfer in the circumferential direction due to rotation of the brake disc.

It is still another object of the present invention to provide a brake disc that improves durability and safety by lowering the heat transfer rate in the circumferential direction according to the rotation of the brake disc through expansion of the heat dissipation area.

Brake improvement and dust exhaust and heat dissipation area expansion brake disk according to the present invention for achieving this object,

A hydraulic piston fixed to the axle or strut and actuated by the pedal force of the brake pedal, a pair of brake pads actuated by the hydraulic piston, a caliper embedding the pad, a hub with a part of the edge inserted between both pads on the caliper In the brake disc rotor coupled to the drive shaft and rotated integrally with the drive shaft,

A brake disc rotor comprising a boss coupled to the drive shaft and a body formed in a radial direction of an outer circumferential surface of the boss;

A plurality of grooves formed so as to have a length on the surface of the disk along the circumferential direction about the rotational center of the disk and distributed in a spaced apart position on the surface of the disk to form contact and non-contact surfaces in contact with the pad; ;

And an exhaust tip formed at an end of the groove to diffuse and exhaust the fluid.

In addition, the groove is formed on either side of the two-sided surface of the disk, or characterized in that each formed on the two-sided surface.

In addition, the grooves are characterized in that they are formed symmetrically or asymmetrically on both surfaces of the disk.

In addition, the groove is inclined so as to have an inclination of 30 to 50 degrees circumferentially with respect to the rotation direction of the disk.

Further, the overall length of the groove formed on the disk is characterized in that it is any one selected from straight straight type, multiple straight type deviated from straight line, and nonlinear shape bent in S-shape.

In addition, the shape of the groove is semi-circular cross-sectional shape, the upper part of which is partially open, the circular part is open, the upper part is open U-shaped cross section, the upper part is open rectangular cross section, the upper part is open triangular cross section, and the upper part is Is selected from any one or more than one shape selected from among the open geometric cross-sectional shapes.

In addition, the vertical depth of the grooves to be dug on the disc disc under the condition that the thickness of the disc is 10mm is characterized in that formed by digging to a depth of 0.5 ~ 2mm.

In addition, the width of the grooves dug on the disk disc under the condition that the thickness of the disk is 10mm is characterized in that formed in the 1.5 ~ 3mm width.

In addition, the exhaust tip is characterized in that it is formed of a round slope machined into the gradient surface to scatter the fluid flowing along the groove in the outward direction.

In addition, the brake disc rotor is characterized in that the molding by the method selected from the CNC machining molding, casting molding method.

According to the present invention, the groove is provided on the surface of the brake disc to smooth the surface, thereby suppressing the slip phenomenon against the frictional force of the pad. Therefore, the initial frictional response to the brake braking effort is high, thereby improving braking performance.

Grooves on the surface of the brake disc increase drainage, which reduces the friction of the pads due to moisture, improves braking performance of the braking system, and quickly discharges the disk surface dust resulting from pad wear to prevent disc wear. have.

The heat transfer in the circumferential direction according to the rotation of the brake disc is suppressed through the groove, so that the braking rate of the brake device is stably maintained.

1 is a conventional solid brake disk.
2 is a conventional ventilator type brake disc.
3 is a schematic diagram of a brake disc rotor and a braking device according to an embodiment of the present invention.
Figure 4 is a cross-sectional view of the brake disc rotor and brake device according to an embodiment of the present invention.
5 is a cross-sectional view of a brake device operating state of the brake disc rotor according to the embodiment of the present invention;
6 is a schematic diagram of a brake disc rotor and a braking device according to an embodiment of the present invention.
7 is a detailed view of the exhaust tip formed in the groove of the brake disc rotor according to an embodiment of the present invention.
Figure 8 is a brake disc rotor according to an embodiment of the present invention (a) is a plan view, (b) is a bottom view, (c) is an example in which no groove is formed.
Figure 9 is a rotation arrangement state of the groove formed in the brake disc rotor according to an embodiment of the present invention.
10 (a), (b), (c) and (d) are views illustrating various formation examples of the groove shape according to the embodiment of the present invention.
Figure 11 (a) (b) (c) (d) (e) (f) is a view showing an example of the groove shape of the groove according to the embodiment of the present invention.
12 is a dimensional explanatory diagram of a groove groove according to an embodiment of the present invention.

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

3 is a schematic diagram of a brake disc rotor and a braking device according to an embodiment of the present invention.

4 is a cross-sectional view of the brake disc rotor and the braking device according to the embodiment of the present invention. In the drawings, the braking device is a schematic drawing referring to a general braking device.

5 is a cross-sectional view of an operating state of a brake device for a brake disc rotor according to an exemplary embodiment of the present invention. In the drawings, the braking device is a schematic drawing citing the principle of operation of a general braking device.

6 is a schematic diagram of a brake disc rotor and a braking device according to an embodiment of the present invention. In the drawings, the braking device is a schematic drawing referring to a general braking device.

7 is a detailed view of the exhaust tip formed on the groove of the brake disc rotor according to the embodiment of the present invention. A diagram showing the scattering or diffusion discharge state of fluid through an exhaust tip.

8 is a brake disc rotor according to an embodiment of the present invention, (a) is a plan view, (b) is a bottom view, and (c) is an example in which no groove is formed.

9 is a rotational arrangement diagram of grooves formed in the brake disc rotor according to the embodiment of the present invention.

10 (a), (b), (c) and (d) are diagrams illustrating various formation examples of the groove shape according to the embodiment of the present invention.

(A) (b) (c) (d) (e) (f) of FIG. 11 illustrate an example of a groove shape of a groove according to an exemplary embodiment of the present invention.

12 is a reference view for explaining the dimensions of the groove groove according to the embodiment of the present invention.

As shown in FIGS. 3 and 4, a brake piston improved and a dust exhaust and heat dissipation area expandable brake disc according to an embodiment of the present invention are fixed to an axle or strut and are operated by a pedal force of a brake pedal. The drive shaft is driven by the hub with a part of the edge inserted between the pair of brake pads 100 operated by the piston and the calipers 110 incorporating the pads 100 and both pads 100 on the calipers 110. And a brake disc that is coupled to and rotates integrally with its drive shaft.

The brake disc rotor 200 includes a main body 230 including a boss 210 coupled to a driving shaft, and a disk 220 formed in the radial direction of the outer circumferential surface of the boss 210.

And, as shown in FIG. 5, the grooves are formed to have a length on the surface of the disk 220 along the circumferential direction about the axis of rotation of the disk 220 and are spaced apart from each other on the surface of the disk 220. It is composed of a plurality of grooves 300 are distributed to form a contact surface a1 and a non-contact surface a2 in contact with the pad 100.

6 and 7, an exhaust tip 310 is formed at the end of the groove 300 to fly out the fluid.

In addition, the groove 300 may be formed on either side of the two-sided surface of the disk 220 or may be formed on each of the two-sided surfaces. Referring to FIG. 8A, the groove 300 is formed on the surface of the disc 220, and (b) illustrates an example in which the groove 300 is formed at the rear surface of (a). Is shown as an example without forming a groove.

Preferably, the grooves 300 are formed on both surfaces of the disc 220. This is advantageous for acting a uniform distribution of braking force in and out of the disc 220. Even if only one side can be obtained a constant braking performance, but the surface wear of the disc 220 may appear different. For example, the surface of one disc may appear higher than the surface of the other.

However, braking performance is improved in either case compared to smooth disk surfaces without grooves 300. This is due to the action of suppressing the slip appearing on the smooth disk surface by repeatedly passing through the planar contact and non-planar contact when the brake pad 100 is in continuous contact with the groove 300.

In addition, the groove 300 may be disposed symmetrically or asymmetrically on both surfaces of the disk 220. The groove 300 is preferably disposed symmetrically on both surfaces of the disk 220. The two-sided symmetrical arrangement is more advantageous in preventing piece wear of the brake pad 100 compared to the asymmetrical arrangement.

In addition, as shown in FIG. 9, the groove 300 has an inclined angle θ1 of 30 to 50 ° circumferentially with respect to the rotation direction of the disc 220 based on any one of the plurality of grooves. It is desirable to put a slope.
That is, as shown in Fig. 9, the inclination θ1 of the grooves formed on the circumference of the disc has the inclination θ1 of the grooves a to θ1, and the inclination θ1 is formed at an angle of 30 to 50 ° based on the groove a. . Therefore, the inclination θ1 is a slope of a and b, b and c, c and d, and the inclinations of the grooves formed on the disk circumference are all formed at the same inclination angle.

When the inclination θ1 is placed on the groove 300 formed on the surface of the disc 220, the disc 220 of the disc 220 including the wear dust generated in the brake pad 100 through the exhaust tip 310 during the rotation of the disc 220. The surface residual water can be quickly discharged in an accelerated state by obtaining a centrifugal force along the radial direction of rotation of the disc 220.

In addition, the overall length of the groove 300 formed on the disk 220 may be formed in various shapes as shown in FIG.

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Exhaust and drainage characteristics and performance may vary depending on the shape and overall length of the groove 300. The design shape and overall length may be applied in consideration of the size and thickness of the disc 220 and the characteristics of the braking device used. Can be.

In addition, the cross-sectional shape of the groove 300 is, as shown in Fig. 11, the semicircular cross-sectional shape of (a), the circular cross-sectional shape of which the upper part of (b) is open, the upper part of (c) is open The U-shaped cross-section, the rectangular cross-section with the top of (d) open, the V-shaped cross-section with the top of (e) open, and (f) are examples of inclined rectangular cross-section. In addition, it is possible to select and apply an appropriate shape from among various geometric cross-sectional shapes (not shown) with the top open.

In addition, as shown in FIG. 12, the groove 300 has a dimension of 0.5 in the vertical depth L1 of the groove 300 which is recessed on the disc 220 disc under the condition that the thickness of the disc 220 is 10 mm. It is desirable to form at a depth of ˜2 mm.

Under the condition that the overall cross-sectional thickness of the disc 220 is 10 mm, the depth dug into the vertical depth of 0.5 to 2 mm improves the braking property by increasing the friction force without affecting the overall strength, durability, and thermal deformation of the disc 220. At the same time, it is the depth (L1) to obtain the heat dissipation performance while inducing and exhausting the dust generated from braking and the moisture from the infiltration of water.

In this case, if the depth L1 is too deep, the strength of the disk 220 is lowered, and vice versa. The groove 300 of the present invention may be formed in various shapes, but it is preferable to form a semi-circular cross-sectional shape as shown in FIG.

In addition, it is preferable that the width L2 of the groove 300 dug in a semi-circular cross-sectional shape on the disc 220 disc under the condition that the thickness of the disc 220 is 10 mm is 1.5 to 3 mm wide.

Under the condition that the overall cross-sectional thickness of the disc 220 is 10 mm, the width that is dug 1.5 to 3 mm of the groove 300 may be increased by the frictional force without affecting the overall strength, durability and thermal deformation of the disc 220. In addition, it is the size of width (L2) that can obtain heat dissipation performance while inducing collection and exhaust of moisture from braking dust and water infiltration at the same time.

Herein, if the width L2 is too wide, the strength of the disc 220 is lowered, and if the width L2 is vice versa, the braking property, the exhaust performance, and the heat dissipation performance are confirmed to be reduced or weakened.

In addition, the exhaust tip 310 is an inertial force acting in the disk rotation direction when formed as a round slope 320 is processed into a gradient surface to scatter the various fluids flowing along the groove 300 in the outward direction The residual material on the groove 300 is discharged quickly and stably in the outward direction of the disc 220.

If it is formed as a jaw without the slope 320, the residual material scattered in the outer direction due to the rotational inertia force of the disk 220 is blocked by the groove 300 and the inflow back into the inner surface of the disk 220, resulting in the phenomenon of implantation on the surface of the disc 220. Likely to cause wear. Accordingly, it is desirable to have a slope 320 at the end of the exhaust tip 310 of the groove 300.

The brake disc rotor 200 according to the present invention may be molded by a method selected from among methods selected from molding through a CNC machining and casting molding.

The brake disc rotor 200 should be considered thermal conductivity, elastic modulus, thermal expansion coefficient, high temperature dimensional stability, tensile strength and the like. Gray cast iron is mainly used, and improvement of material properties such as thermal conductivity by improvement of additive composition and casting method continues.

In order to reduce the weight of the brake disc rotor 200, an aluminum composite material is used, and is mainly used as a brake device for a car by using a material manufactured by a stirring casting method. The aluminum composite material obtained by the stirring casting method is strengthened by dispersing SiC powder in aluminum molten metal.

Referring to the effect of the present invention configured as described in detail as follows.

Since the surface of the brake disk 220 constituting the brake disk rotor 200 is filled with the groove 300, the surface of the brake disk 220 is not smoother than the disk surface having the flat surface and does not exhibit a slip phenomenon with respect to the friction force of the pad 100. Therefore, the initial frictional response to the brake braking force is high to improve the braking performance.

As shown in FIG. 5, the brake pad 100 forms the contact surface a1 and the non-contact surface a2 with the surface of the disc 220.

The drainage rate is increased by the groove 300 on the surface of the brake disc 220. For example, it is shown that the braking performance of the braking device is generally degraded due to a decrease in the frictional force of the pad during rainy weather or wet road driving.

The groove 300 arranged along the surface circumferential surface of the disk 220 to which the brake pad 100 is in contact temporarily discharges moisture and then discharges moisture accumulated in the groove 300 with inertial force when the disk rotates. And scatter outwards through the

In the same principle as the drainage, the disk surface dust generated from the abrasion when braking the brake pad 100 is quickly discharged through the exhaust tip 310 of the groove 300 to prevent the partial wear of the disk 220 caused by the dust and foreign matter. Suppress

FIG. 7 illustrates a discharge state of foreign matter including water and dust discharged along the slope 320 surface of the exhaust tip 310 configured at the end of the groove 300 on the disc 220.

The present invention suppresses a decrease in braking rate due to heat transfer in various types of brake discs. For example, in a solid brake disc or a ventilator type brake disc, a phenomenon in which it easily flies by heat transfer in the circumferential direction due to rotation occurs.

The brake disc rotor 200 of the present invention having the groove 300 has a heat dissipation area corresponding to the area of the depth L1 and the width L2 of the groove 300 formed on the surface of the disc 220, and thus is expanded into the atmosphere. The air contact area is increased, which improves the problem of lowering the braking rate of the brake device due to heat transfer.

The brake disc having a heat dissipation groove or a vent hole improves the release characteristic of the heat of friction in a state where the kinetic energy of the disc is converted into friction heat energy. Accordingly, although the durability of the brake disc may be drastically reduced by the groove or the vent hole, the present invention provides the brake disc rotor 200 by leaving the groove 300 which is dug in a semicircular cross-section along the surface of the disc 220. Among the characteristics, there is an advantage that can improve the performance of the brake disk without affecting the elastic modulus, thermal expansion coefficient, high temperature dimensional stability, tensile strength and the like.

In addition, the brake disc rotor 200 according to the present invention has an advantage of being relatively simple to be manufactured through various methods such as molding through a CNC machining and casting molding.

As described above, the present invention has been described with reference to the drawings and specification, with reference to an embodiment of the invention, but it is an example. Various modifications and equivalent implementations may be made by those skilled in the art.

100: brake pad
110: caliper
200: brake disc rotor
210: boss
220: disk
300: groove
310: exhaust tip
320: slope

Claims (10)

Hydraulic piston fixed to the axle or strut and operated by the pedaling force of the brake pedal, a pair of brake pads 100 operated by the hydraulic piston, and a caliper 110 incorporating the pad 100, on the caliper 110 The brake disk rotor is coupled to the drive shaft by the hub and is integrally rotated with the drive shaft while a part of the edge is inserted between the two pads 100, but the boss 210 and the boss 210 are coupled to the drive shaft. Brake disk rotor 200 consisting of a main body 230 including a disk 220 formed in the radial direction of the outer circumferential surface of the; It is formed so as to have a length on the surface of the disk 220 along the circumferential direction around the rotation center of the disk 220 and distributed in a spaced apart position on the surface of the disk 220 and the pad 100 In the brake disk consisting of a plurality of grooves (300) forming a contact surface (a1) and a non-contact surface (a2) in contact,
The disk 220 is formed in a width (L2) of the groove 300, which is dug on the disk 220 disc under a condition that the thickness of 10mm is 1.5 ~ 3mm width and the vertical depth (L1) of the groove 300 is It is formed to a depth of 0.5 ~ 2mm,
It is formed at the end of the groove 300 to form an exhaust tip 310 for scattering the fluid and the exhaust tip 310 is a semi-circular cross-sectional shape of the dust and fluid flowing along the groove 300 formed in the outward direction Brake improvement and dust exhaust and heat dissipation area extended brake disc, characterized in that it is formed of a round slope 320 machined into a gradient surface for scattering emission. delete delete delete delete delete delete delete delete delete

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