KR102042255B1 - Solid type brake disc and manufacturing method of the same - Google Patents

Abstract

A hat part composed of a plurality of circular body parts mounted on a rotating shaft of the wheel and protruding along the circumferential direction from the outer surface of the body part, and being divided into an intaglio part having an inner space; And a through-hole formed at a center thereof to protrude toward the intaglio from the circumferential surface formed by the ring body and the circumferential surface formed by the through-hole to be accommodated in the inner space to be enclosed by the intaglio. A brake disc of a solid type including a friction part divided into protrusions connected to each other is introduced.

Description

Solid type brake disc and its manufacturing method {SOLID TYPE BRAKE DISC AND MANUFACTURING METHOD OF THE SAME}

The present invention relates to a brake disc of a solid type, in which the hat part and the friction part are separately configured to form a firm coupling through a bridge that is a connection structure between each other.

In the case of the conventional solid type brake disc, the hat part and the friction part are formed in one piece, and the load of heat and torque is applied to the rear wheel which is relatively smaller than the front wheel. However, there was a restriction in space depending on the characteristics formed integrally.

Therefore, the solid type brake disc that can overcome the space limitation by making it thinner and lighter than the existing one through the rigid structure of the hat part and the friction part.

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

KR 10-2014-0084734

It is an object of the present invention to provide a solid brake disc of which a hat part and a friction part are separately configured to form a firm coupling through a bridge that is a connection structure between each other.

Solid type brake disk according to the present invention for achieving the above object is composed of a plurality of circular body portion mounted to the rotating shaft of the wheel protrudes along the circumferential direction from the outer surface of the body portion, the inner space is provided Hat parts divided into intaglio; And a through-hole formed at a center thereof to protrude toward the intaglio from the circumferential surface formed by the ring body and the circumferential surface formed by the through-hole to be accommodated in the inner space to be enclosed by the intaglio. It includes; friction parts are divided into protrusions connected to carry.

The intaglio end may be in contact with the circumferential surface of the through hole to form a joint surface, and the joint surface may be turned.

The protruding portion protrudes from the circumferential surface and extends from the first protrusion and the first protrusion formed in the form of decreasing thickness toward the end with respect to the axial direction, and increases in thickness toward the end. The second protrusion may be divided to have the smallest thickness at the boundary between the first protrusion and the second protrusion.

The width of the protrusion may be formed in a shape that decreases toward the end.

The ratio of the length of the protrusion protruding from the circumferential surface of the through hole to the length from the end of the protrusion to the outer circumference of the ring body based on the radial direction may be formed in the range of 0.20 ~ 0.25.

The thickness ratio at the boundary between the first protrusion and the second protrusion relative to the thickness of the ring body may be in the range of 0.35 to 0.40.

The second protrusion is inclined upward and downward from a boundary between the first protrusion and the second protrusion, based on an axial direction, and an upper end of a boundary between the first protrusion and the second protrusion. And it may be formed to be tilted 2 to 3 ° up and down relative to the imaginary line extending in parallel with the radial direction at the bottom.

A plurality of bridges formed of the intaglio portion and the protrusion may be formed at equal distances along the outer surface and the circumferential surface, and a discharge hole may be formed between the bridges.

The number of bridges may be nine.

In the intaglio portion, an insertion hole may be formed on a radial surface of the hat part of the intaglio portion to form an inlet through which the protrusion is inserted into the inner space.

The intaglio portion is formed separately from the insertion hole and the air vent hole is formed through the inner space, the air vent hole, is formed on the axial direction of the hat part of the surface of the intaglio portion and Can be communicated.

Solid type brake disk manufacturing method according to the present invention is composed of a circular body portion and a plurality of mounted on the rotating shaft of the wheel through the casting is formed protruding along the circumferential direction from the outer surface of the body portion, the inner space is provided as an intaglio portion A first molding step of molding the divided hat parts; An insert step of inserting the hat part into a mold; And a through-hole formed in the center through casting to receive the hat part into the through-hole and to protrude toward the intaglio from the circumferential surface formed by the through-hole to be received in the inner space. And a second molding step of forming a friction part divided into protrusions connected to be wrapped by the second protrusion.

In the first molding step and the second molding step, cast iron is used for casting the hat part and the friction part, and the strength of cast iron used for casting the friction part is the strength of the cast iron used for casting the hat part. Can be higher.

After the first molding step may further include a machining step of turning the end of the intaglio portion.

In the first molding step, it is possible to form an insertion hole into which the protrusion is inserted and an air bleed hole formed separately from the insertion hole in the intaglio portion.

According to the brake disc of the solid type according to the present invention as described above, the hat part and the friction part are separately formed and combined, so that the hat part and the friction part can be stably combined by the firm coupling of the engraved parts and the projections. have.

Accordingly, it can withstand the load of the torque, and the hat part and the friction part are formed separately to overcome the limitations of the space (Dimension) according to the combined characteristics. As a result, weight reduction of the parts can be achieved.

1 is a view showing a brake disc of a solid type according to a first embodiment of the present invention.
2 is a cross-sectional view of a brake disc of a solid type according to a first embodiment of the present invention.
3 is a cross-sectional view taken along the AA direction in FIG. 2 according to the first embodiment of the present invention.
4 is a diagram illustrating a hat part according to a first exemplary embodiment of the present invention.
5 is a view showing a friction part according to a first embodiment of the present invention.
6 is a cross-sectional view of a brake disc of a solid type according to the first embodiment of the present invention.
7 is a view showing a side view of the projection according to the first embodiment of the present invention.
8 is a view showing a heat island of the heat distribution diagram for the brake disk of the solid type according to the first embodiment of the present invention.
9 is a diagram illustrating Out of the plane (Direction for axial) Bending Mode among Frequency Response Analysis results for a brake disc of a solid type according to the first embodiment of the present invention.
FIG. 10 is a view showing a milled joint surface according to the first embodiment of the present invention. FIG.
FIG. 11 is a view showing a milled joint surface according to the first embodiment of the present invention. FIG.
12 is a cross-sectional view of a brake disc of a solid type according to a second embodiment of the present invention.
FIG. 13 is a view showing a brake disc of a solid type according to a second embodiment of the present invention; FIG.

Hereinafter, with reference to the accompanying drawings looks at a preferred embodiment of the present invention.

The first embodiment of the brake disc of the solid type according to the present invention is composed of a circular body portion 110 and a plurality of mounted to the rotating shaft of the wheel when referring to Figures 1 to 3 of the body portion 110 A hat part 100 protruding from the outer surface 111 along the circumferential direction and divided into an intaglio portion 120 provided with an inner space 121; And a through-hole 211 formed at the center thereof, and including a ring body 210 for accommodating the hat part 100 into the through-hole 211 and a circumferential surface 212 formed by the through-hole 211. And a friction part 200 protruding toward the engraved part 120 to be accommodated in the inner space 121 and divided into protrusions 220 connected to be enclosed by the engraved part 120.

In this case, the inlet portion of the inner space 121 into which the protrusion 220 is inserted, that is, the open portion of the intaglio 120 is referred to as an insertion hole 123 for convenience of description.

The hat part 100 is mounted to the rotation axis of the wheel to be connected to the vehicle body. Referring to FIG. 4, the main body 110 constituting the hat part 100 has a circular shape, and an outer surface 111 is formed along a circumference of the circle. A plurality of intaglio portions 120 protrude from the outer surface 111 along the circumferential direction. The engraved part 120 constituting the hat part 100 is a portion where the friction part 200 is coupled to be described later. Preferably, the intaglio 120 may be formed to be spaced apart by the same distance. The inner space 121 is formed in the intaglio 120.

Preferably, the hat part 100 may be formed of high-strength spheroidal graphite cast iron and may be lighter than conventional thinning and partial weight, and may simultaneously implement a parking function.

The friction part 200 is a part in which mechanical friction is generated for braking as shown in FIG. 5, and the ring body part 210 constituting the friction part 200 is formed in a ring shape in which a through hole 211 is formed in the center thereof. The hat part 100 is accommodated in the hole 211. A plurality of protrusions 220 corresponding to the number and positions of the intaglio portions 120 protrude from the circumferential surface 212 formed along the edge of the through hole 211. Protruding portion 220 of the friction part 200 is a portion that is directly coupled with the intaglio portion 120 for the combination of the hat part 100 and the friction part 200.

The protrusion 220 is accommodated in the inner space 121 of the intaglio 120. Accordingly, the intaglio 120 is coupled to the protrusion 220 in a form of surrounding the protrusion 220. The intaglio portion 120 has an internal space 121 formed therein, and the protrusion 220 fills the inner space 121 so that the protrusion 220 and the intaglio 120 are in contact with each other.

Preferably, the friction part 200 is excellent in heat resistance and wear resistance, and may be formed of gray cast iron (flake graphite iron) having the same thermal expansion coefficient as spherical graphite iron.

The friction part 200 is formed in a solid type in which no vent hole for separate heat dissipation is formed. In the case of the conventional solid type brake disc, the hat part 100 and the friction part 200 are integrally formed as one, and a load of heat and torque is applied to the rear wheel which is relatively smaller than the front wheel. However, there was a restriction in space depending on the characteristics formed integrally.

The brake disc of the solid type according to the present invention is formed by combining the hat part 100 and the friction part 200 of different materials separately, and the hat part 100 by the firm coupling of the intaglio part 120 and the protrusion part 220. And friction part 200 can withstand the load of the torque by making a stable coupling. In addition, the hat part 100 and the friction part 200 may be formed separately to overcome the limitations of the space depending on the combined characteristics. As a result, weight reduction of the parts can be achieved.

Preferably, as shown in FIG. 2, the intaglio portion 120 has an end contacting the circumferential surface 212 of the through hole 211 to form a joint surface 122, and the joint surface 122 may be turned. have.

As described above, the solid type brake disc according to the present invention has a hat part 100 through a firm coupling between the intaglio portion 120 formed in the hat part 100 and the protrusion 220 formed in the friction part 200. And the friction part 200 is to be stably coupled bar engraved portion 120 accommodates the projection 220 into the inner space 121, the end of the engraved portion 120 is the circumferential surface of the ring body 210 By being in contact with the 212, it is possible to increase the bonding force between each other.

At this time, the end of the intaglio portion 120 in contact with the circumferential surface 212 of the ring body 210 through-hole 211 forms a joint surface 122 and the joint surface 122 is turned It can prevent the deformation of parts. The portion except the joint surface 122 in the intaglio 120 does not require a separate processing in the kitchen state.

Preferably, as shown in FIG. 2, the protrusion 220 protrudes from the circumferential surface 212, and the first protrusion 221 and the first protrusion formed in a shape of decreasing in thickness toward the end portion in the axial direction. The second protrusion 222 extends from the protrusion 221 and increases in thickness toward the end of the protrusion 221, and is separated from the boundary between the first protrusion 221 and the second protrusion 222. The thickness can be formed smallest.

In the above, the thickness may mean a length from one end to the other end based on the axial direction.

The first protrusion 221 constituting the protrusion 220 may protrude from the circumferential surface 212 of the ring body 210 and may be formed in a shape of decreasing thickness toward the end.

The second protrusion 222 constituting the protrusion 220 is a portion extending from the first protrusion 221 in the direction in which the first protrusion 221 protrudes. The thickness of the second protrusion 222 may be formed to increase toward the end. In the meantime, the thickness of the first protrusion 221 and the second protrusion 222 is formed to be the smallest at the boundary between the protrusions 221 and the protrusions 220. It may be provided so as not to be separated from the (121).

Accordingly, the inner space 121 corresponding to the shape of the protrusion 210 may also be formed in such a manner that the area of the cross section perpendicular to the extending direction becomes narrower from the entrance toward the inside and then widens again.

Preferably, as can be seen in FIG. 3 showing a cross-sectional view in the A-A direction of FIG. 2, the width of the protrusion 220 may be formed in a decreasing shape toward the end.

The width may mean a direction perpendicular to the length on the same plane when the direction in which the protrusion 220 protrudes is defined as the length.

The width of the protrusion 220 decreases toward the end so that the molten metal can be filled without empty space during casting of the friction part 200 in the state where the hat part 100 is inserted into the mold. ) Can be molded in a shape that tightly wraps the protrusion 220.

Preferably, referring to FIG. 6, the circumferential surface 212 of the through hole 211 has a length from the end of the protrusion 220 to the outer circumference of the ring body 210 based on the radial direction. The ratio of the length from which the protrusion 220 protrudes from may be formed in the range of 0.20 ~ 0.25.

The length of the protrusion 220 protruding from the circumferential surface 212 of the ring body 210 to the end of the ring body portion from the end of the protrusion 220 contacting the outer surface 111 of the hat part 100. The value divided by the length b to the outer circumference of 210 may be 0.20 to 0.25.

If the ratio is less than 0.20, the supporting area is reduced when the torque is applied in the rotational direction, and thus it cannot have an effective stress distribution effect. On the other hand, if the ratio exceeds 0.25, the length of the protrusion 220 is longer than necessary compared to the outer diameter of the ring body 210, causing unstable shaking during braking and a direct load acting on the protrusion 220. This makes it difficult to ensure structural robustness and increases the maximum working stress value.

Therefore, it is reasonable to control the ratio of the length of the protrusion 220 protruding from the circumferential surface 212 of the through hole to the length from the end of the protrusion 220 to the outer circumference of the ring body 210 in the range of 0.20 to 0.25. Do.

To look at a specific example through Table 1 below.

Comparative Example 1
(Ratio: 0.18) Example
(Ratio: 0.23) Comparative Example 2
(Ratio: 0.27) Hatpart maximum stress Frictional stress Hatpart maximum stress Frictional stress Hatpart maximum stress Frictional stress 163 MPa 215 MPa 145 MPa 158 MPa 164 MPa 217 MPa

In Comparative Example 1, the ratio of the length of the protrusion 220 protruding from the circumferential surface 212 of the through hole to the length from the end of the protrusion 220 to the outer circumference of the ring body is 0.18, which has an effective stress dispersion effect. It can be seen that the maximum stress applied to the hat part 100 and the friction part 200 is increased by 12% and 36%, respectively, compared to the embodiment.

In Comparative Example 2, the ratio of the length from which the protrusion 220 protrudes from the circumferential surface 212 of the through hole 211 to the length from the end of the protrusion 220 to the outer circumference of the ring body 210 is 0.27. As a direct load acts on the protrusion 220, it can be seen that the maximum stress applied to the hat part 100 and the friction part 200 is increased by 13% and 37%, respectively, compared to the embodiment.

Preferably, referring to FIG. 6, the thickness ratio at the boundary between the first protrusion 221 and the second protrusion 222 with respect to the thickness of the ring body 210 is in a range of 0.35 to 0.40. Can be formed.

A value obtained by dividing the thickness c at the boundary between the first protrusion 221 and the second protrusion 222 by the thickness d of the ring body 210 may be 0.35 to 0.40.

Generally, when molding through casting, the thickness must be at least 5 mm to implement the shape. When the thickness ratio at the boundary between the first protrusion 221 and the second protrusion 222 with respect to the thickness of the ring body 210 is less than 0.35, the thickness of the protrusion 220 is formed to a minimum thickness or less and cast Defects can be caused. On the other hand, when the thickness ratio at the boundary between the first protrusion 221 and the second protrusion 222 with respect to the thickness of the ring body 210 exceeds 0.40, the intaglio 120 surrounding the protrusion 220 Since the thickness (e) of the remaining value of the remaining value of the thickness of the protrusion 220 is subtracted from the thickness of, it becomes difficult to secure structural robustness against the vertical load acting on the friction surface.

Therefore, it is reasonable to control the thickness ratio at the boundary between the first protrusion 221 and the second protrusion 222 with respect to the thickness of the ring body 210 in the range of 0.35 to 0.40.

Referring to FIG. 7, preferably, an inclination is formed upward and downward from a boundary between the first protrusion 221 and the second protrusion 222 on the basis of the axial direction. The upper and lower ends of the boundary between the 221 and the second protrusion 222 may be formed to be tilted 2 to 3 degrees upward and downward based on an imaginary line extending in parallel with the radial direction.

The first and second protrusions 221 and 222 based on imaginary lines extending parallel to the radial direction at the upper and lower ends of the boundary between the first and second protrusions 221 and 222. ), The inclination of the second protrusion 222 inclined upward and downward can be controlled in a range of 2 to 3 °.

When the protrusion 220 coupled to the intaglio portion 120 is inclined upwardly and downwardly toward the end, that is, when the reverse gradient is formed, the expansion in the radial direction is suppressed during thermal expansion. Thereby, it is possible to suppress the deformation which causes the shaking of the component.

If the thickness (e) of the remaining value obtained by subtracting the thickness of the protrusion 220 from the thickness of the intaglio portion 120 surrounding the protrusion 220 does not secure 3.5 mm, the maximum stress is about 186 MPa based on 3.5 mm. It is rapidly reduced to about 166 MPa.

When the inclination of the protrusions 220 formed upward and downward is less than 2 °, it is difficult to expect the effect of forming the inverse gradient as described above, and there is a difficulty in implementing the formation through casting. On the other hand, when the inclination of the protrusions 220 formed in the room and downwards exceeds 3 °, half the thickness (e) of the remaining value obtained by subtracting the thickness of the protrusions 220 from the thickness of the intaglio portion 120 surrounding the protrusions 220. ) Is less than 3.5mm, it is difficult to secure the structural robustness against the vertical load acting on the friction surface.

Therefore, the angle of inclination upward and downward relative to the imaginary line extending parallel to the radial direction at the upper and lower ends of the boundary between the first and second protrusions 221 and 222 is in the range of 2 to 3 °. It is reasonable to control as much as possible.

Let's look at a specific example through Table 2 below.

Comparative Example 1
(Slope: 1 °) Example
(Slope: 3 °) Comparative Example 2
(Slope: 4 °) Axial shrinkage thickness 0.28mm 0.28mm 0.28mm Thickness increased by slope 0.38mm 1.16mm 1.54mm (E) Half the thickness of the remainder minus the thickness of the indentation that encloses the indent

3.94mm

3.55mm

3.36mm

In the above examples and comparative examples, the thicknesses at the boundary between the first protrusion 221 and the second protrusion 222 were all equal to 5 mm.

In Comparative Example 1, the half thickness (e) of the remaining value obtained by subtracting the thickness of the protrusion 220 from the thickness of the intaglio portion 120 surrounding the protrusion 220 is 3.94 mm, which satisfies 3.5 mm or more but is substantially shaped. In the case of Comparative Example 2, the thickness of the protrusion 120 is subtracted from the thickness of the intaglio portion 220 surrounding the protrusion 120, and the half thickness e of the remaining value of the remaining value is 3.5 mm or less. It is difficult to secure structural robustness against the vertical load acting on the surface.

Preferably, the plurality of bridges including the intaglio portion 120 and the protrusion portion 220 are formed at equal distances along the outer surface 111 and the circumferential surface 212 to discharge holes 10 between the bridges. It may be formed and the number of the bridge may be formed of nine.

In general, the mode shape of the brake disc is related to the correlation between the judder phenomenon, which is a trembling phenomenon during braking, and the occurrence of heat island. If the distribution of heat islands overlaps during the out of the plane (direction for axial) bending mode of the brake disc mode, heat islands can easily occur.

The number of bridges formed by the combination of the intaglio 120 and the protrusion 220 is advantageously configured to be an odd number to avoid overlapping. When the number of bridges is formed to seven is structural strength is disadvantageous, if the number of bridges is formed to 11 the weight is difficult to achieve the weight reduction. Therefore, it is reasonable that the number of bridges is nine.

Based on this, when the heat transfer analysis is performed in the structure of the brake disk having nine bridges, a heat distribution diagram as shown in FIG. 8 appears and nine heat islands appear.

Out of the plane (Direction for axial) Bending Mode is shown in Fig. 9 among the results of Frequency Response Analysis of the brake disc, and the heat transfers that can be generated at this time are 4, 6, 8, 10, and 12, respectively. Since it does not overlap with nine heat islands, it is possible to alleviate the occurrence of judder phenomenon.

Meanwhile, the second embodiment of the solid type brake disc according to the present invention basically applies the same configuration as that of the first embodiment, but uses a part of the intaglio portion 130 which is different from the intaglio portion 120 of the first embodiment. Done. Specifically, as shown in FIG. 12 and FIG. 13, the air vent hole 131 is additionally formed in the intaglio portion 130, which is different from the intaglio portion 120.

The air bleeding hole 131 is formed in a different direction from the insertion hole 123 to communicate with the internal space 121, and is isolated from the internal space 121 when casting the ring body 210 and the protrusion 220. It serves as a passage through which air is discharged.

The insertion hole 123 is formed in the radial direction of the hat part 100 or the main body 110 of the intaglio 130, and the air vent hole 131 in the axial direction of the hat part 100 or the main body 110. Is formed, the molten metal flowing through the insertion hole 123 pushes the air inside the internal space 121 through the air bleed hole 131, and the protrusion 220 completely fills the internal space 121. The 220 and the intaglio 120 may be firmly coupled.

Through this, air is isolated in the inner inner space 121 of the intaglio portion 130 to prevent the problem that the coupling force between the intaglio portion 130 and the protrusion 220 is lowered by forming an empty space without completely filling the molten metal. can do.

In addition, as a part of the molten metal is filled into the air bleed hole 131, the molten solidified in a kind of hook shape may further increase the coupling force between the protrusion 220 and the intaglio 130. That is, the protrusion 220 may serve as a kind of stopper for preventing the protrusion 220 from moving in the direction away from the intaglio 130.

The first embodiment of the method of manufacturing a brake disc of the solid type according to the present invention comprises a circular body portion 110 and a plurality of outer surfaces 111 of the body portion 110 which are mounted on the rotating shaft of the wheel through casting. A first molding step of forming a hat part 100 which is formed to protrude along the circumferential direction and is divided into the intaglio portion 120 in which the internal space 121 is provided; An insert step of inserting the hat part 100 into a mold; And a through-hole 211 formed at the center through casting to form a ring body 210 for receiving the hat part 100 into the through-hole 211 and a circumferential surface formed by the through-hole 211 ( The second molding protrudes toward the intaglio portion 120 from the 212 to accommodate the inner space 121 to form the friction part 200 divided into the protrusion 220 connected to be wrapped by the intaglio 120. It includes; step.

The first molding step may be performed by a sand casting method. In the second molding step, the molten metal is filled into the internal space 121 of the hat part 100 formed in the first molding step 120 and is enclosed by the engraved part 120. Protrusions 120 may be formed.

Preferably, the hat part 100 may be preheated before the insert step. At this time, the preheating temperature may be 450 ± 50 ° C. This preheating is performed for the purpose of improving melt flowability in the protrusion part 220 at the time of differential casting.

Preferably, in the first molding step and the second molding step, cast iron is used for casting the hat part 100 and the friction part 200, and the strength of cast iron used for casting the hat part 100. It may be higher than the strength of the cast iron used for the casting of the friction part 200.

In the case of the hat part 100, a spheroidal graphite iron material of 400 MPa or more grade may be used, and in the case of the friction part 200, a gray cast iron material of 200 MPa or more grade may be used.

Preferably, in the method for manufacturing a brake disc of the solid type according to the present invention, a machining step of turning the end of the intaglio portion 120 after the first molding step may be further performed.

Preferably, the ends of the intaglio portion 120 are connected to contact the circumferential surface 212 of the ring body portion 210 to increase the coupling force between each other. At this time, the end of the intaglio portion 120 in contact with the circumferential surface 212 of the through-hole 211 of the ring body 210 forms a joint surface 122 by turning the joint surface 122 through a machining step It can prevent the deformation of parts. However, the part except the joint surface 122 in the intaglio portion 120 may not be subjected to a separate processing in the kitchen state.

The second embodiment of the method for manufacturing a brake disc of the solid type according to the present invention is similar to the structure of the first embodiment described above, but forms the intaglio portion 130 having different shapes of the intaglio portion 120 of the first embodiment. The parts to make are different.

That is, during the first molding step, the intaglio portion 130 having the air bleed hole 131 formed through the internal space 121 is formed separately from the insertion hole 123. By forming the air bleed hole 131 in the intaglio portion 130 as described above, the problem of preventing the air from being isolated in the inner space 121 is prevented, and the molten metal introduced during the second molding step is filled in the inner space 121 without any gap. Can be.

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.

100: hat part 110: main body
111: outer side 120: intaglio (first embodiment)
121: internal space 122: joint surface
123: insertion hole 130: intaglio (second embodiment)
131: air bleed hole 200: friction part
210: ring body portion 211: through hole
212: circumferential surface 220: protrusion
221: first protrusion 222: second protrusion

Claims (15)

A hat part composed of a plurality of circular body parts mounted on a rotating shaft of the wheel and protruding along the circumferential direction from the outer surface of the body part, and being divided into an intaglio part having an inner space; And
A through-hole is formed in the center to protrude toward the intaglio from the circumferential surface formed by the ring body and the circumferential surface formed by the through-hole into the through-hole to be enclosed by the intaglio by being enclosed in the inner space. It includes; friction parts are divided into protrusions connected;
In the intaglio portion, an insertion hole is formed on a radial surface of the hat part of the intaglio portion to form an inlet through which the protrusion is inserted into the inner space, and is formed separately from the insertion hole to be formed through the inner space and the through hole. Air vent hole is formed,
The air vent hole is formed on the axial surface of the hat part of the intaglio portion of the solid type brake disc, characterized in that the communication with the internal space. The method according to claim 1,
The intaglio end of the solid-state brake disk, characterized in that the end is in contact with the peripheral surface of the through hole to form a joining surface, the joining surface is turned. The method according to claim 1,
The protrusion is,
A first protrusion protruding from the circumferential surface and formed in a form of decreasing thickness toward the end in the axial direction and a second protrusion extending from the first protrusion and increasing in thickness toward the end; The brake disc of the solid type, characterized in that it is divided into a sieve and formed the smallest thickness at the boundary between the first projection and the second projection. The method according to claim 1,
The width of the protrusion portion is a solid type brake disc, characterized in that formed in a shape that decreases toward the end. The method according to claim 1,
The ratio of the length of the protrusion projecting from the circumferential surface of the through hole to the length from the end of the protrusion to the outer circumference of the ring body in the radial direction is formed in the range of 0.20 to 0.25 disk. The method according to claim 3,
The thickness ratio of the thickness at the boundary of the first projection and the second projection to the thickness of the ring body portion is a solid type brake disc, characterized in that formed in the range of 0.35 ~ 0.40. The method according to claim 3,
The second protrusion,
An inclination is formed upward and downward from the boundary between the first projection and the second projection based on the axial direction,
Solid type brake, characterized in that the inclined 2 to 3 ° up and down on the basis of the imaginary line extending in parallel with the radial direction at the top and bottom of the boundary between the first projection and the second projection. disk. The method according to claim 1,
The plurality of bridges formed of the intaglio portion and the protrusions are formed at equal distances along the outer surface and the circumferential surface so that a discharge hole is formed between the bridges. The method according to claim 8,
The number of the bridges is a solid type brake disc, characterized in that formed in nine. delete delete A first molding step of forming a hat part formed of a plurality of circular body parts and a plurality of circular body parts mounted on a rotating shaft of the wheel through the casting and protruding in the circumferential direction from the outer surface of the body part and being divided into an intaglio part having an inner space;
An insert step of inserting the hat part into a mold; And
Through hole is formed in the center through the casting through the ring body for accommodating the hat part into the through hole and protruding toward the intaglio portion from the circumferential surface formed by the through hole is received by the intaglio portion And a second molding step of molding a friction part divided into protrusions connected to be wrapped.
In the first molding step,
And an insertion hole into which the protrusion is inserted, and an air bleed hole formed separately from the insertion hole to form an air bleed hole in the inner space. The method according to claim 12,
In the first molding step and the second molding step,
Cast iron is used to cast the hat part and the friction part, and the strength of the cast iron used for the casting of the hat part is higher than that of the cast iron used for the casting of the friction part. Way. The method according to claim 12,
After the first molding step,
And a machining step of turning the end of the intaglio portion. delete

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