KR20020004176A - brake disc having double vent structure - Google Patents

Abstract

PURPOSE: A brake disk having double vent structure is provided to ventilate actively and diffuse heat by enlarging the air passage with forming vent holes additionally, and to prevent accidents and damage of the disk by improving cooling efficiency of the brake disk. CONSTITUTION: A brake disk(10) is composed of a cylindrical disk hub(10a) rotating with a wheel, and a disk plate(11) formed in the outer periphery of the disk hub. A first vent hole(13) and a second vent hole(14) are formed radially in the middle of the disk plate, and ribs(15) are placed between vent holes. The second vent hole is formed to be twice as thick as the disk plate, or with mounting the additional plate member to the disk plate. Frictional heat is generated at both sides of the disk plate owing to friction between the brake pad and the disk plate in braking, and radiated with forming first and second vent holes in the disk plate. Cooling efficiency is improved with ventilating actively by enlarging the air passage. Air is circulated actively and heat is diffused with forming vent holes. The accidents and the damage of the disk are prevented with improving cooling efficiency.

Description

Brake disc having double vent structure

The present invention relates to a brake disc used for a disc brake of an automobile, and more specifically, by forming another vent hole on one side of a disc plate having a vent hole, a wider air flow path can be secured. The present invention relates to a brake disc that can expect a smooth air distribution and heat spreading action.

In general, a vehicle is provided with a braking device that serves to slow down or stop the vehicle speed while driving.

This braking device is a booster that doubles the pedal effort using the vacuum pressure generated by the engine power, and applies brake oil hydraulic pressure to the brake circuit according to the pressure doubled by the booster. A master cylinder to be formed, and a wheel cylinder to stop the rotation of the wheel by the brake oil pressure and to reduce the rotation speed.

The wheel cylinder has a braking force by closely attaching a brake pad to a drum brake that generates a braking force by closely contacting an inner circumferential surface of a cylindrical drum rotating synchronously with a wheel wheel to generate a braking force, or a disc of disk type that synchronously rotates with a wheel wheel. Is installed on the disc brake to brake the disc.

Here, a typical example of the disc brake is shown in FIG. 1, which is briefly described as follows.

The disc brake, as shown, a caliper having a disk 110 installed to rotate synchronously with the wheel wheel, and brake pads 125 which are fixed to the inner knuckle arm of the wheel wheel and are perturbed across both sides of the disk 110. Largely composed of the caliper body 130 perturbed around the caliper bracket 120 so that the brake pad 125 can contact the disk 110 by the action of the bracket 120 and the piston 132 according to the hydraulic pressure. It is.

On the other hand, at the lower end of the caliper bracket 120, a support part 121 having a through hole 122 is formed to be fixed to the knuckle arm through a bolt, and a guide part 123 having pin holes 123a at both ends of the upper end part. Is formed, and a pad spring 124 on which the brake pad 125 is perturbed is provided inside the guide part 123.

In addition, a wheel cylinder 131 is formed in the center of the caliper body 130 in the perturbation direction of the brake pad 125, and a piston 132 is provided in the wheel cylinder 131 to provide the wheel cylinder 131. The brake pad 125 located inside the disk 110 is perturbed toward the disk 110 by hydraulic pressure injected into the disk 110, and sliding pins 134 are perturbably coupled to the pin holes 123a at both ends. It is fastened and fixed by the bolt 135 through this coupling hole 134a.

And the lower end of the caliper body 130 to contact the brake pad 126 located on the outside of the disk 110 in contact with the outer surface of the disk 110 in response to the piston 132 during the operation of the piston 132. The fork portion 138 extends toward the brake pad 126 to support the rear surface thereof.

When the disk brake is configured as described above, the pressure of the vacuum booster acting upon the stepping of the brake pedal injects the brake oil into the wheel cylinder 131 of the caliper body 130 through the master cylinder. At this time, the piston 132 is in close contact with the disk 110, the brake pad 125 located on the inside while advancing by the injected brake oil.

At the same time, the caliper body 130 reacts backward with respect to the forward action of the piston 132 by the pressure of the brake oil. At this time, the caliper body 130 perturbates in the pin hole 123a of the guide part 123 of the caliper bracket 120 through the sliding pin 134 and moves backward. The fork portion 138 formed at the lower portion of the caliper body 130 moving rearwardly contacts the outer side of the disk 110 with the brake pad 125 located outside.

In this process, the brake disc 110 contacts the brake pad 125 to stop the rotational motion of the disk 110 or reduce the rotational speed through the frictional force.

In the disc brake as described above, the brake disc 110 is in a high temperature state by frictional heat during braking to prevent deterioration or deterioration of braking performance. A plurality of vent holes 113 are formed radially in the center of the disk plate 111 of the columnar shape with the ribs 115 interposed therebetween.

The vent hole 113 prevents the disk 110 from becoming a high temperature state by repetitive friction by making the speed of divergence of the frictional heat generated by the brake pad 125 through the ventilation action during driving.

However, as described above, since the conventional brake disc 110 constitutes one vent hole 113 at the center of the disc plate 111, the friction heat of the brake pad 125 and the disc plate 111 is effectively dissipated at high speed. It becomes possible to cause the phenomenon that heat is concentrated on the friction portion of the disk plate 111.

Such heat concentration of the brake disc causes local disc wear or cracks and deformation on the disc, and high frictional heat is transferred to the brake fluid, causing vapor lock, resulting in reduced braking performance and loss of function. There is a problem.

Accordingly, the present invention has been made in view of the above problems, by providing a double vent structure to provide a brake disk to ensure a wider air flow path to expect a smooth air distribution and heat diffusion action. There is this.

1 is a partially cutaway perspective view showing a general disc brake.

FIG. 2 is a side cross-sectional view of a portion of a conventional disk of the disk brake shown in FIG. 1; FIG.

3 is a side cross-sectional view partially extracting a brake disc brake according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: brake disc 10a: disc hub

11: disc plate 13: first vent hole

14 second vent hole 15 rib

According to a feature of the present invention for achieving the above object, in the brake disk, the disk plate having a vent hole is formed on the outer side of the disk hub, one side of the disk plate has a separate vent hole different from the vent hole Provided is a brake disc formed.

Hereinafter, an embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

3 shows a brake disc 10 according to an embodiment of the invention. The brake disk 10 is composed of a cylindrical disk hub 10a installed to rotate synchronously with a wheel wheel, and a disk plate 11 formed in a disc shape on one outer circumference of the disk hub 10a.

In addition, the first vent hole 13 and the second vent hole 14 are radially formed at the center of the circumferential disk plate 11 outside the disk hub 10a with each rib 15 interposed therebetween. In this case, the second vent hole 14 is formed by doubling the basic thickness of the disk plate 11 on which the first vent hole 13 is formed, or by forming a separate plate member on which the second vent hole 14 is formed. It can form by attaching to the side surface of the plate 11.

According to the brake disc 10 according to the present invention configured as described above, the friction heat of the brake pads during braking generates friction heat on both sides of the disc plate 11.

In this process, the disc plate 11 assists in dissipating frictional heat generated by friction between the brake pad and the disc plate 11 through the first vent hole 13 and the second vent hole 14 to the air. Bar, at this time, the first vent hole 13 and the second vent hole 14 formed in the double are more secured than the brake disk having a single vent hole by ensuring a wider flow path of the air to facilitate the flow of air. The effect can be increased.

As described above, the present invention can further secure a wider air flow path by additionally forming another vent hole on one side of the disk plate on which the vent hole is formed, so that smooth air flow and heat diffusion can be expected. do.

Accordingly, the present invention can maximize the cooling effect of the brake disc, thereby preventing the accident of the disc and the safety accident due to the brake performance deterioration and loss of function due to the vapor lock of the brake fluid.

While the invention has been shown and described with respect to particular embodiments, those skilled in the art will recognize that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the appended claims. Anyone can easily know.

Claims (1)

In a brake disc in which a disc plate having a vent hole is formed outside of the disc hub, Brake disk, characterized in that the one side of the disk plate is formed with another vent hole different from the vent hole.