DIH-STRUCTURED BRAKE DISK WITH DRUM FOR PARKING BRAKE AND DISK ROTOR FOR DISK BRAKE FORMED INTEGRALLY [Technical Field]

The present invention relates to a DIH-structured brake disk integrally formed with a drum for parking brake and a disk rotor for disk brake, and more particularly, to a DIH-structured brake disk in which a disk rotor used for general braking and a drum used for parking brake are configured into one body. [Background Art]

In general, a brake device for vehicles is used for slowing down or stopping a vehicle while driving as well as maintaining a parking state, and it can be divided into a foot brake that is used for slowing down or stopping a vehicle, and a parking brake that is used for parking. Of these, the foot brake is divided into a disk brake and a drum brake based upon its structure. The disk brake with a structure in which a disk rotating along with the wheel is decelerated by pressing the pads provided in both sides thereof is mostly mounted on the front wheel of a vehicle, and the drum brake with a structure in which a drum rotating along with the wheel is decelerated by expanding a pair of brake shoes provided there within is mostly mounted on the rear wheel of a vehicle. At this time, the drum brake mounted on the rear wheel acts as a foot brake as well as a parking brake.

In recent years, on the other hand, the disk brake instead of the drum disk is used even at the rear wheel of a vehicle, and when the disk brake is used at the rear wheel a parking brake is separately provided from the disk brake, and it is realized by a Drum-In-Hat (DIH) structure.

FIG. Ia is a perspective view illustrating a brake disk in a conventional DIH structure.

As illustrated in FIG. Ia, a brake disk 100 in a conventional DIH structure is provided with a hat part 110 and a disk rotor 120 respectively, and formed in a structure that the brake disk 100 and the hat part 110 are combined with each other by a bush 130.

The hat part 110 is combined with the disk rotor 120 through the bush 130 to form an outer cover of the disk rotor 120 while a drum for parking brake 112 closed adhered to frictional material (for example, brake shoe) at the time of hand- lever (not shown) operation by a user is integrally formed. Here, the drum for parking brake 112 is formed with a cylindrical groove there inside, and although not shown in FIG. Ia, various brake elements (for example, brake shoes, operation lever, return springs, adjuster, etc.) for performing a parking brake function are integrated inside the cylindrical groove.

FIG. Ib is a view for explaining a parking brake operation by a drum for parking brake 112 integrally formed in a hat part of FIG. Ia. Referring to FIGS. Ia and Ib, when a parking brake lever (not shown) is pulled backward by the user the brake shoes 114 pulled by a cable (not shown) is moved to a side of the drum 112, thereby creating an adhesion force

(frictional force) between the brake shoes 114 and the drum 112. Here, the reference numeral

116 of FIG. Ib is an operation lever for spreading the brake shoes 114 to a side of the drum for parking brake 112, and the reference numeral 118 is return springs, and the reference numeral 120 is an adjuster for adjusting a gap between the brake shoes 114 and the drum

112.

Again, referring to FIG. Ia, the disk rotor 120 is formed in a structure that the peripheral portion is attached to pads in a caliper (not shown) at the time of braking, and at this time, the surface temperature on the peripheral portion of the disk rotor 120 is increased to a substantial level by attaching to the pads in a caliper, and therefore the disk rotor 120 is formed in a heat radiation structure that outer air inflow paths such as inlet holes or cooling holes are formed. [Disclosure] [Technical Problem]

However, such a conventional DIH-structured brake disk 100 as illustrated in FIG.

1 a, has a problem that the load of a structure for brake operation is increased, because a hat part 110 is integrally formed with a drum for parking brake 112, and the hat part 110 including the drum for parking brake 112 is mostly produced using iron material having a high density.

In recent years, of course, there has been an attempt to remove such a problem by forming a hat part with stainless steel plate (SUS) or aluminum material, but in case of SUS or aluminum material, there is a problem that it may be relatively susceptible to applying a large braking force to a drum for parking brake 112 integrally formed in a hat part 110 due to low frictional coefficient, and especially in case of aluminum material it may be easily deformed by heat, and when it is treated with an oxide layer, the oxide layer may be worn down by abrasion. The present invention is devised to solve such a conventional problem, and it is an object of the invention to separate a drum for parking brake from a hat part to integrally form into a disk rotor, and form the material of the drum for parking brake with a same material as that of the disk rotor (for example, ceramic material), thereby increasing the efficiency of the parking brake at the time of parking braking while reducing the load of the disk itself, and securing the broader layout of a DIH- structured brake disk. [Technical Solution]

In order to achieve such an object of the invention, the present invention provides a DIH-structured brake disk, comprising: a disk rotor formed with a disk shape having a circular hole in the center, and formed in a structure that the peripheral portion is attached to brake pad in a caliper and a hat part for forming an outer cover of the disk rotor by combining with a body of the disk rotor through a combining member, wherein in the inner circumferential surface of the disk rotor, a drum for parking brake closed adhered to frictional material at the time of hand-lever operation by a user is integrally formed with the disk rotor.

According to a preferred embodiment, the drum for parking brake and the disk rotor may be integrally formed by a same material and a same manufacturing process. According to a preferred embodiment, the drum for parking brake and the disk rotor may be respectively formed by a same material and separate manufacturing processes, and then integrally formed by adhering two elements.

Furthermore, according to a preferred embodiment, the material of the drum for parking brake and the disk rotor may be made of ceramic material. [Advantageous Effects]

In a DIH-structured brake disk of the invention, a drum for parking brake may be formed by ceramic material, thereby increasing the efficiency of a parking brake while reducing the load of a brake disk itself. In a DIH -structured brake disk of the invention, the heat capacity of a disk rotor itself may be increased by integrally forming a drum for parking brake into the disk rotor, thereby enhancing the performance of a brake (for example, heat capacity and heat radiation process) at the time of general braking. [Description of Drawings]

FIG. Ia is a perspective view illustrating a brake disk in a conventional DIH structure.

FIG. Ib is a view for explaining a parking brake operation by a drum integrally formed in a hat part of FIG. Ia. FIG. 2a is an exploded oblique view and a side view illustrating a DIH-structured brake disk integrally formed with a drum for parking brake and a disk rotor for disk brake according to a preferred embodiment of the invention.

FIG. 2b is a perspective view and a side view illustrating a DIH-structured brake disk in which each element of the brake disk of FIG. 2a is fabricated. [Best Mode]

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2a is an exploded oblique view and a side view illustrating a DIH-structured brake disk 200 integrally formed with a drum for parking brake 212 and a disk rotor for disk brake 210 according to a preferred embodiment of the invention, and FIG. 2b is a perspective view and a side view illustrating a DIH-structured brake disk 200 in which each element of the brake disk of FIG. 2a is fabricated.

Referring to FIGS. 2a and 2b, a DIH-structured brake disk 200 of the invention includes a disk rotor 210 formed in a structure that the peripheral portion is attached to brake pad in a caliperCnot shown) at the time of braking, and a hat part 220 for forming an outer cover of the disk rotor, wherein the disk rotor 210 and the hat part 220 are fabricated and combined with each other through a combining member 230 (for example, bush), and a through hole 214 fixed to the combining member 230 is formed in a body of the disk rotor 210 (or, the drum for parking brake 212).

In particular, in the inner circumferential surface of the disk rotor 210 constituting the DIH-structured brake disk 200 of the invention, a drum for parking brake 212 closed adhered to frictional material (for example, brake shoes) at the time of hand-lever (not shown) operation by a user is integrally formed with the disk rotor 210.

Furthermore, in the DIH-structured brake disk 200 of the invention, the drum for parking brake 212 and the disk rotor 210 may be formed by a same material, and preferably, the drum for brake and the disk rotor may be integrally formed by ceramic material.

Furthermore, according to a preferred embodiment, in the DIH-structured brake disk 200 of the invention, the drum for parking brake 212 and the disk rotor 210 may be integrally formed by a same manufacturing process, and furthermore, the drum for parking brake 212 and the disk rotor 210 may be formed by separate processes, and then integrally formed by adhering two elements 212, 210.

In addition, according to a preferred embodiment, the disk rotor 120 may further include outer air inflow paths such as inlet holes or cooling holes, although not shown in FIGS. 2a and 2b.

In general, ceramic material has high frictional coefficient and relatively low load compared to molten iron, stainless steel plate (SUS), or aluminum material. Accordingly, in the DIH-structured brake disk 200 of the invention, the drum for parking brake 212 may be formed by ceramic material (in the prior art, it is formed by a same material as that of the hat part 220, such as molten iron, stainless steel plate (SUS), or aluminum material), thereby increasing the efficiency of the parking brake while reducing the load of the brake disk 200 itself.

Furthermore, in order to radiate brake factional heat created by brake friction against the brake pads (not shown) of a caliper (not shown), it is generally important to increase heat capacity for the disk rotor 210 by expanding a volume of the disk rotor 210 itself. Accordingly, in the DIH-structured brake disk 200 of the invention, the drum for parking brake 212 may be formed with a same material (for example, ceramic material) as that of the disk rotor 210 and integrally formed with the disk rotor 210 to derive an effect of expanding a volume of the disk rotor 210 itself (for example, volume of ceramic material), thereby increasing the heat capacity of the disk rotor 210 to enhance the performance of a brake (for example, heat radiation process) at the time of general braking. The ceramic material applied to the drum for parking brake 212 and the disk rotor

210 of the invention may include all kinds of publicly- known ceramic materials, and preferably, fiber-reinforced ceramic materials, and more preferably, carbon fiber- or metal whisker-reinforced ceramic materials may be applied as the materials of the drum for parking brake and the disk rotor. While in the foregoing, a technical idea of the present invention has been described by way of a few exemplary embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the essential characteristic of the invention. Therefore, it is understood that the embodiments of the invention are disclosed not to limit but to describe the technical idea of the present invention, and the scope of the technical idea of the present invention is not limited by those embodiments. The protected scope of the invention shall be defined by the appended claims, and all the technical ideas within the equivalent scope of the invention shall fall within the scope of the right of the invention.