JPH068350Y2 - brake disc - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a brake disc used in an automobile or other vehicle.

(Prior Art) Conventionally, as shown in FIG. 5 according to Japanese Utility Model Laid-Open No. 63-28930, as shown in FIG.
In a brake disc body a having an integrally formed disc portion b, a plurality of vent holes c that penetrate the disc portion b in the radial direction are arranged at intervals in the circumferential direction, and a vent hole row d is arranged in the axial direction. Brake discs provided with two rows are known. In this one, the vent holes c of both vent hole rows d, d are arranged so as to be offset from each other in the circumferential direction, and each vent hole c is an ellipse that is flat in the axial direction. In the solid annular portion which is formed in a shape and extends straight in the circumferential direction between both vent hole rows d, the arrangement pitch part e of the vent holes c of the vent hole row d on one side and the vent hole row on the other side The heat of the pad sliding contact surface on one side and the heat of the pad sliding contact surface on the other side are alternately transmitted at intervals in the circumferential direction from the arrangement pitch portion e of the ventilation holes c of d, and this heat is transferred. The disk portion is cooled by the air passing through the ventilation holes c of the ventilation hole array d on the opposite side facing the hole arrangement pitch portion e of each ventilation hole array d. Whole is to be cooled uniformly.

(Problems to be solved by the invention) By the way, it is extremely advantageous to arrange a plurality of vent hole rows d in the disc portion b in the axial direction in order to improve the cooling performance of the disc portion b, but the thickness of the disc portion b As the brake disc becomes heavier and the brake disc becomes heavier, and the unsprung load of the vehicle increases and the material cost increases, it is desired to develop a brake disc having a thin disc portion so as to reduce its weight and cost.

Here, it is conceivable to narrow the axial gap ₁ between the vent hole rows d, d.
_{If 1} is made narrower, the thickness _{2 of} the vent holes c adjacent to each other in the axial direction of the disc part b, where c overlaps with each other, becomes thin, which may reduce the rigidity of the disc part b. If the axial width of the ventilation hole c is reduced, the rigidity of the disk portion b can be reduced without lowering the rigidity. However, considering the rigidity of the core and the sand removing property after casting, the axial width of the ventilation hole c is too small. Can not.

After all, how to make the disk portion b thinner without lowering the rigidity becomes a problem.

The present invention has been made in view of the above demands, and an object of the present invention is to provide a brake disc that secures rigidity of the disc portion and has a small thickness.

(Means for Solving the Problems) In order to achieve the above object, in the invention of claim 1, a plurality of vent holes penetrating the disc portion in the radial direction is circumferentially provided in the brake disc body having the integrally formed disc portion. In a structure in which two rows of ventilation holes are provided at intervals in the axial direction, the ventilation holes of both the ventilation hole rows are arranged so as to be offset from each other in the circumferential direction, and the ventilation holes are connected to each other. It was formed in a mountain shape that bulges toward the arrangement pitch portion of the ventilation holes of the adjacent ventilation hole rows in a range in which a solid annular portion that straightly extends in the circumferential direction remains between the pore rows.

Further, the brake disc body is provided with a plurality of vent holes penetrating in the disc portion in the radial direction at intervals in the circumferential direction, and the brake disc is provided with three vent hole rows in the axial direction. As can be seen, in the invention of claim 2, the vent holes of the adjacent vent hole rows are arranged so as to be offset from each other in the circumferential direction, and the vent holes of the outer vent hole row are arranged with the vent holes of the central vent hole row. The vent hole of the central vent hole row was formed in a rhombus shape while being formed in a mountain shape that bulges toward the pitch portion.

(Operation) According to the invention of claim 1, the ventilation holes of the one side ventilation hole row and the ventilation holes of the other side ventilation hole row axially overlap each other at the respective angled hypotenuses. According to the second aspect of the invention, the vent holes of the outer vent hole row and the vent holes of the central vent hole row are axially overlapped in the former mountain-shaped hypotenuse portion and the latter rhombus-shaped hypotenuse portion. Even if the axial gaps of the rows are sandwiched, the wall thickness of the overlapping portion can be secured between the hypotenuse portions, and thus the disk portion can be thinned without lowering its rigidity.

By the way, when two rows of ventilation holes are provided, if the mountain-shaped apex portions of the ventilation holes of the one-side ventilation hole row and the mountain-shaped apex portions of the ventilation holes of the other side ventilation hole row overlap in the circumferential direction, The heat transmitted from the pad sliding contact surface on both sides through the pitch arrangement part of the vent holes of each vent hole row is the chevron shape of the vent holes of the one vent hole row and the chevron shape of the vent holes of the other vent row. When heat is entirely input to the portion between the hypotenuse and air is less likely to flow into the ventilation hole due to deceleration due to braking, the temperature of the hypotenuse portion rises and heat on the pad sliding contact surface is less likely to diffuse.

On the other hand, in the invention of claim 1, since the solid annular portion extending straight in the circumferential direction remains between both vent hole rows, the heat from the pad sliding contact surface on each side is the vent holes of each vent hole row. When it is diffused in the circumferential direction from the arrangement pitch part of the pad and transmitted to the solid annular part, the heat transfer function from the pad sliding contact surface is improved, and it becomes difficult for air to flow to the ventilation hole due to deceleration due to braking. The temperature rise of the pad sliding contact surface can be suppressed.

According to the second aspect of the present invention, since there is a sufficient amount of meat for heat extraction between the outer vent holes, a solid circular ring is provided between the outer vent holes and the central vent holes. Leaving a copy is not essential.

(Embodiment) FIGS. 1 to 3 show a first embodiment of the present invention.

In the drawing, (1) shows a brake disc main body, and the main body (1) is attached to an axle with an integrally formed disc portion (2) having pad sliding contact surfaces (2a) (2a) on both sides in the axial direction. Boss (3)
And a plurality of vent holes (4) penetrating the disc portion (2) in the radial direction are arranged in the main body (1) at intervals in the circumferential direction ( 5) are provided in two rows in the axial direction.

Here, the air holes (4) of the one air hole row (5) and the air holes (4) of the other air hole row (5) are arranged so that their positions are displaced from each other in the circumferential direction. , Each of the ventilation holes (4) is formed in a mountain shape that bulges toward the arrangement pitch portion (6) of the ventilation holes (4) of the adjacent ventilation hole row (5), and one ventilation hole row ( The mountain tops of the air holes (4) of 5) and the mountain tops of the air holes (4) of the other air vent row (5) do not overlap in the circumferential direction,
A solid annular portion that extends straight in the circumferential direction between both vent hole rows (5) (5)
I left (7).

According to the above configuration, the vent holes (4) and (4) adjacent to each other in the axial direction of both the vent hole rows (5) and (5) overlap each other in the axial direction at the respective angled hypotenuses. Even if the axial gap ₃ of the pore row (5) (5) is sandwiched, it is possible to secure the necessary wall thickness ₄ between the hypotenuses in the overlapping portion of the vent holes (4) (4),
The rigidity of the disc part (2) does not decrease.

In addition, heat from the pad sliding contact surface (2a) on each side is transferred to each vent hole row.
Ventilation holes (4) of (5) are diffused in the circumferential direction from the pitch part (6) and are transmitted to the solid annular part (7), and it is difficult for air to flow into the ventilation holes (4) due to deceleration due to braking. Even so, the temperature rise of the pad sliding contact surface (2a) is suppressed by the heat-extracting action on the solid annular portion (7).

Further, since the axial width of the intermediate portion in the circumferential direction of each vent hole (4) becomes large, problems such as a decrease in rigidity of the core and deterioration of sand removing property after casting do not occur.

FIG. 4 shows a second embodiment of the present invention, in which three rows of vent holes are provided in the disc portion (2) in the axial direction, and the vent hole rows (5 ₁ ) (5 ₁ ) Vents (4 ₁ ) to the central vent row
Vent holes of (5 ₂ ) are formed in a mountain shape that bulges toward the arrangement pitch part of the vent holes (4 ₂ ), and the vent holes of the central vent hole row (5 ₂ )
(4 ₂ ) was formed into a diamond shape.

Thus, the the overlapping portion of the vent hole (4 ₁₎ of the vent hole (4 ₂₎ and axially outer sides of the vent hole arrays (5 ₁₎ (5 ₁₎ of the center of the vent hole rows (5 ₂₎ Ensure the necessary wall thickness between the rhombic hypotenuses of the vents (4 ₂ ) and the chevron hypotenuses of the vents (4 ₁ ) to ensure the axial gap between these vent hole rows (5 ₁ ) (5 ₂ ). Narrowed and also each vent (4 ₁ )
Since the axial width of the intermediate portion of (4 ₂ ) in the circumferential direction becomes large, problems such as lower rigidity of the core and deterioration of sand removal after casting do not occur, and the vent hole rows (5 ₁ ) (5 ₁ ) improves the heat dissipation by the central vent row (5 ₂ ), improving the cooling performance of the brake disc.

(Effect of Device) As is apparent from the above description, according to the device of claim 1, the thickness of both vent hole rows is ensured while ensuring the necessary thickness in the portion where the vent holes of both vent hole rows overlap each other. Since the axial gap can be narrowed, the brake disc can be made thinner and lighter without lowering its rigidity, and even if it becomes difficult for air to flow through the ventilation holes due to deceleration due to braking, the heat generated by the solid annular part The pulling action can suppress the temperature rise of the pad sliding contact surface,
Furthermore, the problems of lowering the rigidity of the core and deteriorating the sand removal property after casting do not occur, and the disk portion can be cast-molded including the vent hole with good workability.

According to the second aspect of the invention, even in the brake disc in which three rows of vent holes are provided in the axial direction, the axial arrangement gap of the vent holes can be inserted as much as possible, and the same effect as described above can be obtained.

[Brief description of drawings]

1 to 3 show a first embodiment of the present invention,
FIG. 1 is a partially cut front view of a brake disc, FIG. 2 is a side view taken along the line II-II thereof, FIG. 3 is an enlarged sectional view taken along the line III-III of FIG. 1, and FIG. FIG. 5 is a cross-sectional view of a main part showing a second embodiment, and FIG. 5 is a cross-sectional view of the main part showing a conventional example. (1) …… Brake disc body (2) …… Disc part (4) (4 ₁ ) (4 ₂ ) …… Vent hole (5) (5 ₁ ) (5 ₂ ) …… Vent hole row (6)… … Vent hole arrangement pitch part (7) …… solid ring part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryoji Kobayashi, 600 Komoro, Komoro, Nagano Prefecture Asama Giken Kogyo Co., Ltd. (72) Inventor, Tsutomu Hiraga, No. 600, Komoro, Nagano Pref. Asama Giken Kogyo Co., Ltd. (72) Inventor Kenji Ogihara, 600, Hei, Komoro-shi, Nagano Asama Giken Kogyo Co., Ltd. (56) References: 52-13288 (JP, U)

Claims (2)

[Scope of utility model registration request] 1. A brake disc main body having an integrally formed disc portion, in which a plurality of vent holes penetrating the disc portion in the radial direction are arranged at intervals in the circumferential direction in the axial direction. In the case where two rows of ventilation holes are provided, the ventilation holes of both the ventilation hole rows are arranged so as to be offset from each other in the circumferential direction, and each ventilation hole is provided with a solid annular portion which is continuous straight in the circumferential direction between both ventilation hole rows. A brake disk, which is formed in a mountain shape that bulges toward the arrangement pitch portion of the vent holes of the adjacent vent hole rows in the remaining range. 2. A brake disc main body having a disc portion integrally formed with a plurality of vent holes penetrating the disc portion in the radial direction and arranged at intervals in the circumferential direction in the axial direction. In the case where three rows are provided, the ventilation holes of the adjacent ventilation hole rows are arranged so as to be offset from each other in the circumferential direction, and the ventilation holes of the outside ventilation hole row are directed toward the arrangement pitch portion of the ventilation holes of the central ventilation hole row. A brake disc, characterized in that it is formed in a bulging chevron shape and the vent holes in the central vent hole row are formed in a rhombus shape.