WO2002031376A1

WO2002031376A1 - Separating brake disc

Info

Publication number: WO2002031376A1
Application number: PCT/KR2001/001521
Authority: WO
Inventors: Mun-Gu Song; Jeong-Hyun Sohn
Original assignee: Song Mun Gu; Sohn Jeong Hyun
Priority date: 2000-10-12
Filing date: 2001-09-08
Publication date: 2002-04-18
Also published as: AU2001286307A1; KR20010082476A; KR100343068B1

Abstract

Disclosed is a brake disc for vehicle comprising; a disc body coupled to an axle and made of an aluminum alloy; and plates detachably fastened to said disc body at both sides for providing friction surfaces to brake pads. Therefore, the invention provides the detachable disc brake which simplifies repair and replacement in maintenance caused by abrasion and in which the disc body is made of the aluminum alloy that is light and excellent in radiation thereby obtaining stable brake power and mileage improvement.

Description

SEPARATING BRAKE DISC

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a brake disc for a vehicle, and more particularly,

to a detachable brake disc having a brake disc body made of an aluminum alloy being

detachable from plates.

Description of the Related Art

In general, a brake installed in a vehicle has a configuration for compressing a

circular brake disc at one side and/or both sides to obtain brake power using a brake pad

or brake pads. This brake is generally called a disc-type brake, in which the speed of a

moving vehicle is decelerated by compression of the disc and the pads and at the same

time a portion of kinetic energy of the vehicle is converted into heat.

The disc-type brake like this is required to have the brake disc as light as possible

to improve running performance, mileage and heat radiation. For the purpose of this, the

brake disc body generally fixed to a hub is made of a light alloy such as aluminum alloy.

However, when the brake disc body is made of the aluminum alloy, in order to

resist friction, doughnut-shaped cast-iron plates are bonded to the surfaces of the disc

contacting to the pads using a welding such as the friction compression and the alfin

process so that the pad may have a friction against the cast-iron plate.

However, when the cast-iron plates are bonded to such a brake disc body, abrasion is accumulated to the cast iron plates due to the contact with the pad as the brake

is operated to fracture the cast-iron plates. When heavily worn, the cast-iron plates are

necessarily replaced regularly. However, since the cast-iron plates are welded to the

brake disc body, the brake disc should be replaced itself.

Further, in order to bond the cast-iron plates to the brake disc body using the

friction compression or the alfin process, a high price special apparatus is required and the

manufacturing cost of the brake disc is raised as a problem.

SUMMARY OF THE INVENTION

Accordingly, the present invention has been proposed to solve the

foregoing problems and it is therefore an object of the invention to provide a detachable

brake disc divided into a disc body and plates, by which only the worn plates can be

replaced without replacing the brake disc itself when replacement thereof is required due

to accumulated abrasion, and by which excess expense due to replacement of the brake

disc itself is saved and a semi-permanent brake disc can be obtained.

It is another object of the invention to provide a brake disc which shows excellent

heat radiation and mileage by using a disc body made of an aluminum alloy which is light

and excellent in thermal conductivity.

According to an embodiment of the invention to obtain the foregoing objects, it is

provided a brake disc for a vehicle comprising: a disc body coupled to an axle and made

of an aluminum alloy; and plates detachably fastened to the disc body at both sides for providing friction surfaces to brake pads.

In the brake disc, the disc body includes a core with recesses and projections and

facings for surrounding both sides of the core, in which the core has the recesses and the

projections to improve heat radiation.

In another aspect, the detachable brake disc of the invention is comprised of a

brake disc body and plates, in which the disc body has recesses and projections

alternatively formed in a radial manner in the surface to reduce self- weight and accelerate

the flow of heat created by friction thereby improving heat radiation performance.

Preferably, the disc body and the plates are coupled with bolts.

Further, when the disc body and the plates are coupled with bolts, the disc body

has bolt fixing portions with a thickness in the surface where the bolts penetrate so that

the bolts can be stably fastened to the disc body.

Further, in the brake disc of the invention, the disc body and/or the plates have a

number of pores to enhance heat radiation for friction heat created by compression of the

pads.

Further, in the brake disc of the invention, the disc body has a number of pin

holes and the plates have grooves mutually opposed to the pin holes so that both ends of

fixing pins penetrating the pin holes in the brake disc body are inserted into the grooves,

thereby to obtain an additional fastening force preventing slip between the disc body and

the plates. BRIEF DESCRIPTION OF THE DRAWINGS

The above object, and other features and advantages of the present invention will become more apparent after a reading of the following detailed description when taken in conjunction with the drawings, in which:

Fig. 1 is a perspective exploded view for showing a brake disc according to an

embodiment of the invention;

Fig. 2 is a perspective exploded view for showing a brake disc according to

another embodiment of the invention;

Fig. 3 is a perspective view of the disc shown in Fig. 2 assembled according to

the embodiment of the invention; and

Fig. 4 is a schematic sectional view of a disc-type brake employing a detachable

brake disc of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Hereinafter, description will be made in reference to the accompanying

drawings for more profound understanding of the invention, whereas it should be

understood apparent by those skilled in the art that the invention can be implemented

without those drawings and detailed description. Addition of numerals and description

to those known features which may unnecessarily malce the concept of the invention

ambiguous will be omitted. Those well-known components and systems will be shown

as blocks so as to avoid that the disclosure of the invention may be made unnecessarily

ambiguous. Fig. 1 is a perspective exploded view for showing a brake disc according to an

embodiment of the invention.

As shown in Fig. 1, a detachable brake disc 1 comprises a brake disc body 10

coupled to an axle and made of a light alloy such as aluminum alloy and left and right

plates 20a and 20b detachably fastened to the disc body 10 at both of right and left sides

thereof and made of cast iron or non-ferrous metal.

The disc body 10 is divided into a core 11 having recesses and projections and

facings 12 surrounding both sides of the core 11, in which the core 11 and the facings 12

are integrally made of an aluminum alloy.

The core 11 with the recesses and the projections has a structure which decreases

the weight of the disc body as well as assists radiation of friction heat created by contact

with pads B (refer to Fig. 4).

Also, the disc body 10 is constituted by the aluminum alloy as a light metal so as

to reduce the weight of the whole brake disc in a great amount thereby obtaining an

excellent effect for mileage.

The disc, body 10 is provided with a number of fastening holes 15 in the surface

thereof, and the left and right plates 20a and 20b are provided with fastening holes 25 in

positions corresponding to the fastening holes 15 of the disc body 10. The reference

numeral 30 designates bolts, and 35 designates nuts.

The fastening holes 25 in the plate surfaces have diameters larger than those of

the bolts 30 and the nuts 35 in order to prevent the bolts 30 and the nuts 35 from projecting out of the surfaces of the plates 20a and 20b.

Also, the dept of insertion of the bolts 30 and the nuts 35 into the plates 20a and

20b is determined under a suitable magnitude when the disc body 10 and the plates 20a

and 20b are fastened by the bolts 30 and the nuts 35, thereby preventing the bolts 30 or the

nuts 35 from projecting over the surfaces of the plates 20a and 20b even if the plates 20a

and 20b are worn at a certain thickness due to friction with the pads.

Another embodiment according to the detachable brake disc of the invention is

described in reference to Figs. 2 and 3.

Fig. 2 is a perspective exploded view for showing a brake disc according to

another embodiment of the invention, and Fig. 3 is a perspective view of the disc shown

in Fig. 2 assembled according to the embodiment of the invention.

As shown in Figs. 2 and 3, the detachable brake 1 comprises a brake disc body

100 made of a light alloy such as aluminum alloy and left and right plates 20a and 20b

made of cast iron or non-ferrous metal.

The brake disc body 100 has recesses 110 and projections 120 alternatively

formed radial from the center, in which the projections 110 have bolt holes 115 through

which bolts 300 pass.

Also, the rear sides of the projections 110 are provided with bolt holding portions

125 at the periphery of the disc body 100 at a uniform thickness for supporting the

inserted bolts 300 to be stably fastened.

The projections 110 and the recesses 120 are alternatively formed to maximize utilization of the surface of the body 100.

The projections 110 or the recesses 120 are used as guide passages of friction heat,

and the left and right plates 200a and 200b are preferably provided in the surfaces thereof

with a number of pores 220, so that friction heat created in contact of the plates 200a and

200b to the pads B (refer to Fig. 4) is discharged through the pores 200 and the

projections 110 or the recesses 120 to promote an effect of heat radiation.

According to positions of the projections 110 where the bolt holes 115 are formed,

the plates 200a and 200b are provided in the surfaces thereof with a number of fastening

holes 210 into which the bolts 300 are inserted to be fastened with the disc body 100.

The fastening holes 210 in the plate surfaces have diameters slightly larger than

those of heads of the bolts in order to prevent that the heads of the bolts 300 project over

the surfaces of the plates 200a and 200b and contact with the pads B.

Also, the bolts 300 are inserted into the plates 200a and 200b less than a suitable

depth so that the heads may not project over the surfaces of the plates 200a and 200b even

if the plates 200a and 200b are worn at a certain thickness.

Further, the disc body 100 has a number of pin holes 150 and the plates 200a and

200b have grooves 250 opposed to the pin holes 150 so that both ends of fixing pins 400

are inserted into the grooves 250 after penetrating the pin holes 150 of the disc body 100.

The fixing pins 400 are additionally and optionally inserted to incur a strong

compression by the pads B (refer to Fig. 4) thereby preventing the disc body 100 and the

plates 200a and 200b from slipping from each other. In other words, this is proposed to decrease a moment applied to the bolts 300 by

mutually opposed inertia forces of the disc body 100 which tends to continuously move as

connected to the axle (not shown) and the plates 200a and 200b which tend to be stopped

by the pads.

The fixing pins 400 primarily penetrate the pin holes 150 of the disc body 100

before fastening by the bolts 300, and the both ends of the fixing pins 400 are inserted into

the grooves 250 in the plates 200a and 200b.

As described hereinbefore, the invention provides the detachable disc brake

which simplifies repair and replacement in maintenance caused by abrasion and in which

the disc body is made of the aluminum alloy that is light and excellent in radiation thereby

obtaining stable brake power and mileage improvement.

The invention as described hereinbefore is not restricted by the embodiments and

the accompanying drawings, but it will be apparent to those skilled in the art that various

substitutions, modifications and changes can be made without departing from the

technical scope of the invention.

Claims

WHAT IS CLAIMED IS:

1. A brake disc for a vehicle comprising:

a disc body coupled to an axle and made of an aluminum alloy; and

plates detachably fastened to said disc body at both sides for providing friction

surfaces to brake pads.

2. The brake disc according to claim 1, wherein said disc body includes a core with

recesses and projections and facings for surrounding both sides of said core, wherein said

core and said facings are integrally provided.

3. The brake disc according to claim 1, wherein said disc body has recesses and

projections alternatively formed in a radial manner in the surface.

4. The brake disc according to claim 1, wherein said disc body and said plates are

coupled with bolts.

5. The brake disc according to claim 4, wherein said disc body has bolt fixing

portions in the surface, said bolt fixing portions having a thickness so that bolts inserted

after penetrating said plates are stably fastened to said disc body.

6. The brake disc according to claim 1, wherein said disc body and/or said plates

have a number of pores.

7. The brake disc according to claim 1, wherein said disc body has a number of pin

holes and said plates have grooves mutually opposed to said pin holes so that both ends of

fixing pins penetrating said pin holes in said brake disc body are inserted into said grooves.