KR20090132172A - A brake disk with dual materials - Google Patents

Abstract

PURPOSE: A bi-material brake disk is provided to improve the durability and strength by making a disk hat of ductile cast iron and improve the frictional force with a pad by making a friction plate of gray cast iron. CONSTITUTION: A bi-material brake disk(100) is composed of a disk hat(160), a friction plate(120) and a cavity. The disk hat is combined in a knuckle part of a vehicle. The disk hat is made of ductile cast iron. The friction plate is manufactured in a disk shape. The friction plate covers the lower end of the disk hat. The friction plate is contacted with a brake pad. The friction plate is made of gray cast iron to strengthen the frictional force. The disk hat and the friction plate are formed in the cavity at the united structure. The cavity is formed within a mold.

Description

Brake discs of different materials {A BRAKE DISK WITH DUAL MATERIALS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake disc of a vehicle comprising a disk hat that is coupled to a knuckle portion of a vehicle and a friction plate that is friction with the brake pad to transmit a braking force to the vehicle.

Vehicle brakes are classified into foot brakes, parking brakes, deceleration brakes and emergency brakes depending on the application. It is also classified into mechanical brakes, hydraulic brakes and hydraulic brakes, depending on the mode of operation. Classification by structure is divided into external contraction, internal expansion and disc type.

Among the disc brakes, brake discs are coupled to each wheel of the disc brake vehicle to rotate together with the wheels, and the discs rotated together with the wheels are selectively brought into close contact with the pads to provide braking force to the vehicle through the frictional force. .

With reference to Figure 1 looks at a conventional brake disk. The disk is largely composed of a disk hat 14 and a friction plate 12, which is coupled to the knuckle portion 50 of the vehicle wheel and rotates like a wheel. A friction plate 12 is provided at the end of the disc hat 14 to rotate like the drive shaft 30 of the wheel. The rotating friction plate 12 is pressed using a pad (not shown), and the braking is applied to the vehicle due to the frictional force. Pressing of the pad is generally using hydraulic pressure, the material is asbestos.

In the case of the conventional brake disc, the disc hat and the friction plate were cast separately, and then used in combination, or even when integrally manufactured, a single material was used to produce efficient braking. Disc hats and friction plates each played a different role, requiring some compromises in performance and durability when using a single material. In addition, when formed as a separate product, there is a problem in that the assembly work is increased and the braking force is lost.

The matters described as the background art are only for the purpose of enhancing the understanding of the background of the present invention, and should not be taken as acknowledging that they correspond to the related arts already known to those skilled in the art.

The present invention has been proposed to solve the above problems, and an object of the present invention is to provide a brake disc composed of different materials so as to integrally cast the disc hat and the friction plate of the brake disc.

According to another aspect of the present invention, there is provided a brake disc of a heterogeneous material, comprising: a disk hat coupled to a knuckle portion of a vehicle and configured of spherical graphite iron to increase strength; And a friction plate formed around a lower end of the disc hat in contact with a brake pad and composed of gray cast iron for reinforcing friction, wherein the disc hat and the friction plate are integrally cast in a cavity formed inside a mold. It features.

The connecting portion of the disc hat and the friction plate may be formed by melting and solidifying the gray cast iron and the nodular graphite cast iron.

The mold may include an upper mold and a lower mold into which gray cast iron or nodular cast iron is injected, respectively, and the cavity may be formed such that the disc hat and the friction plate are separately cast from the upper mold or the lower mold.

In order to prevent the cast iron injected into the lower mold from overflowing to the upper mold side, an overflow outlet through which the cast iron exits may be formed at a connection portion of the disc hat and the friction plate of the cavity.

After the spherical graphite cast iron is injected into the lower mold to form a disc hat, gray cast iron is injected into the upper mold so that the friction plate is connected to the disc hat and can be integrally cast.

According to the brake disc of the heterogeneous material having the structure as described above, the disc hat and the friction plate are integrally cast so that the bonding force is strong and the loss of the braking force is prevented.

In addition, the disc hat is cast in spherical graphite cast iron, and durability and strength are increased, and the friction plate is cast in gray cast iron to provide excellent friction with the pad.

Hereinafter, with reference to the accompanying drawings looks at the brake disc of the dissimilar material according to a preferred embodiment of the present invention.

2 is a cross-sectional view showing a brake disc of different materials according to an embodiment of the present invention, the brake disc of the dissimilar material is coupled to the knuckle portion of the vehicle and composed of a spherical graphite cast iron to enhance the strength (disk hat, 160); And a friction plate 120 which is in a disk shape surrounding the lower end of the disc hat 160 and is in contact with a brake pad (not shown) and is made of gray cast iron to enhance friction. The disc hat 160 and the friction plate 120 are connected to a wall 140, which is a vertical extension, and the wall 140 is cast such that the nodular cast iron and the gray cast iron are interfused with each other. The pad is in contact with the friction plate 120 to provide friction and braking force, and a bolting hole 180 is formed in the disc hat 160 to be coupled with a knuckle portion (not shown).

3 is a table showing the material and characteristics of the brake disc, the disk hat 160 may be used FCD500 (JS standard) of the nodular graphite cast iron. Spheroidal graphite cast iron is a spheroidized graphite and ferrite matrix structure that gray cast iron does not have, so it guarantees 10% elongation and excellent strength compared to gray cast iron. It plays a role of suppressing occurrence.

The friction plate 120 uses a gray cast iron FC200 (JS standard). FC200 can maintain high friction due to high Mn content. The pearlite base structure maintains wear resistance during braking and has excellent relative vibration damping ability. In addition, it acts to effectively release the braking heat generated during braking due to graphite formation into the atmosphere. This can be seen by the high thermal conductivity. In addition, the magnification of specific components of the tissue can be adjusted according to the experiment.

4 is a view showing the structure of each part of the brake disc, where (a) shows a friction plate, (b) shows a month, and (c) shows a disk hat. The friction plate is composed of gray cast iron, and the particles are dense and sharp, and the month has a connective structure in which gray cast iron and nodular graphite iron are fused. The disc hat is composed of spheroidal graphite iron, and spheroidized graphite is observed, and the spherical graphite enables high strength maintenance compared to gray cast iron. The wall is a point where gray cast iron and nodular graphite iron are mutually fused with each other, so that the interface between the components is not formed sharply.

FIG. 5 is a view illustrating casting of a brake disc. The brake disc allows the disc hat 160 and the friction plate 120 to be integrally cast in a cavity 600 formed inside the mold 500.

The mold 500 includes an upper mold 520 and a lower mold 540. Inside the mold, a cavity 600 is formed for casting the disk. The cavity 600 is divided into a disc hat portion 640, a wall portion, and a friction plate portion 620. The friction plate portion 620 is positioned in the upper mold 520 so that spherical graphite iron is introduced through the inlet 522. The lower mold 540 has a disc hat portion 640 positioned to allow gray cast iron to flow through the inlet 542. In addition, in order to prevent the cast iron injected into the lower mold 540 from overflowing to the upper mold 520, an overflow outlet 544 through which cast iron escapes may be formed in the wall portion of the cavity 600, which is a connection portion between the disc hat and the friction plate. do.

Looking at the casting sequence, first, the spherical graphite iron is injected into the lower mold 540 to form the disc hat 640. When the nodular cast iron is filled to a certain degree, the molten steel flows out through the overflow outlet 544 so that the nodular cast iron does not flow into the friction plate 620 beyond the disc hat 640. After all of the nodular cast iron is introduced, gray cast iron is injected into the upper mold 520 after a certain time of solidification. The injection time of gray cast iron is injected at the time when 90% of the nodular graphite iron is solidified, so that it coagulates and coagulates at the monthly part. The specific injection time can be adjusted according to the required specifications.

It is also possible to cast the friction plate in the lower mold rather than in the upper mold, so that it is also possible to cast the disc hat in the upper mold. Overflow outlets can be set up to fit in the wall.

When casting the disk in the above manner, the disk hat is formed of spheroidal graphite cast iron, and the friction plate is formed of gray cast iron to achieve the performance for each purpose. Breaking through is prevented.

While the invention has been shown and described with respect to particular embodiments, it will be appreciated that various changes and modifications can be made in the art without departing from the spirit of the invention provided by the following claims. It will be self-evident for those of ordinary knowledge.

1 is a cutaway perspective view showing a conventional brake disk.

2 is a cross-sectional view of a brake disc of different materials according to an embodiment of the present invention.

3 is a table showing material characteristics of the brake disc of different materials shown in FIG.

(a) is a table showing the composition of each material.

(b) is a table showing the physical properties of each material.

Figure 4 shows the structure of each portion of the brake disc of the heterogeneous material shown in Figure 2,

(a) is a diagram showing the gray cast iron of the friction plate.

(b) is a view showing a state in which gray cast iron and nodular cast iron are fused.

(c) shows the spheroidal graphite cast iron of a disc hat.

5 is a view showing a casting process of the brake disc of different materials shown in FIG.

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

100: brake disc 120: friction plate

140: month 160: disc hat

500: molding 520: upper molding

540: lower molding 600: cavity

Claims (5)

A disk hat 160 coupled to the knuckle portion of the vehicle and configured of spherical graphite iron to increase strength; And And a friction plate 120 made of gray cast iron for contact with the brake pads and reinforcing the frictional force as a disk shape surrounding the lower end of the disc hat 160. The disc hat 160 and the friction plate 120 is integrally cast in a cavity (cavity, 600) formed in the mold 500, characterized in that the brake disc of different materials. The method according to claim 1, The disc hat 160 and the connecting portion of the friction plate 120 is a brake disc of a heterogeneous material, characterized in that formed by melting and solidifying the gray cast iron and nodular graphite cast iron. The method according to claim 1, The mold 500 includes an upper mold 520 and a lower mold 540 into which gray cast iron or nodular cast iron is injected, respectively, and the cavity 600 has a disc hat and a friction plate respectively separated from the upper mold or the lower mold. A brake disc of different materials, characterized in that formed to be cast. The method according to claim 3, Heterogeneous, characterized in that the overflow outlet 544 is formed in the connection portion of the disk hat and the friction plate of the cavity 600 to the cast iron is injected into the lower mold 540 does not overflow to the upper mold 520 side Brake disc made of material. The method according to claim 3, After the spherical graphite iron is injected into the lower mold 540 to form a disc hat 160, gray cast iron is injected into the upper mold 520 so that the friction plate 120 is connected to the disc hat 160 and integrally cast. Dissimilar material brake disc.

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