JP2000074109A - Ventilated disk rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a cooling efficiency by forming a fin member for connecting surfaces which are opposed to each other in inner and outer both side disks in a curve shape so as to direct an inner circumferential side tangent toward a center of a disk in comparing with an outer peripheral side tangent, tapering a tip end part of the inner circumferential side and ensuring much flow rate of air at an opening part of the inner circumferential side. SOLUTION: Surfaces opposed to each other in inner and outer both side disks 2, 3 are integratedly connected to each other by a plurality of fins 51 to 53 which are arranged enclosing penetrating holes 4 opened to centers of the disks 2, 3. In this case, each shape of the fins 51 to 53 is formed in a curve shape bent directing center directions of the disks 2, 3. The inner sides of fins 51 to 53 are sharply erected, the opening part of the inner circumferential side is deeply and widely formed, and an air flow rate for cooling a disk rotor 1 is increased to lead into a ventilation space 6. An inner circumferential side tip end part of each of fins 51 to 53 is formed in an tapered wedge shape, and its both ends are inclined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk brake device for braking a vehicle by pressing a friction pad against a disk rotor connected to a rotating body and rotating together with the rotating body, and more particularly to friction heat generated during braking. And a ventilated disk rotor capable of dissipating heat by cooling air.

[0002]

2. Description of the Related Art Disc brakes are widely used as brakes for vehicles. When a brake pedal force is applied, the disk brake device presses a pair of brake pads opposed to each other across the disk rotor toward a disk-shaped disk rotor rotating integrally with the wheel with a force corresponding to the brake pedal force. . At this time, a frictional force is generated between the brake pad and the disk rotor, and the frictional force becomes a force for suppressing the rotation of the disk rotor, that is, a braking force for suppressing the rotation of the wheel (rotating body). Etc. are stopped.

[0003] When the above-described braking operation is performed in the disk brake device, frictional heat is generated by sliding between the brake pad and the disk rotor. This frictional heat causes, for example, a carbide film to be formed on the surface of the brake pad (that is, the sliding surface with the disk rotor), and the coefficient of friction between the brake pad and the disk rotor is reduced, thereby reducing the braking effect. (A so-called brake pad fade phenomenon) or the like may occur. In order to avoid such a fade phenomenon, various attempts have been made to improve the material, dimensions and shape of the disk rotor so that the frictional heat can be easily radiated. As one of them,
A ventilated disk rotor as shown in FIG. 2 is conventionally known.

A ventilated disk rotor 1 shown in FIG. 2 is connected to a rotating body, and is disposed opposite to each other at an interval, and has an inner disk 2 and an outer disk 3 having sliding surfaces on both outer sides. 5 extending in the circumferential direction and arranged in the circumferential direction to connect between the opposing surfaces of the two disks.
And a ventilation space 6 defined by fins 5 adjacent to the opposing surfaces of the disks 2 and 3 and penetrating from the inner peripheral opening to the outer peripheral opening of the disks 2 and 3.
And

The disk rotor 1 takes in cooling air from the outside by rotating in the direction of the arrow X, and the cooling air flows through the ventilation space 6 from the inner peripheral opening to the outer peripheral opening. The heat exchange between the air and the fins 5 can be performed. As described above, the friction heat generated between the brake pad (not shown) and the disk rotor 1 is radiated by the cooling air to cool the disk rotor 1.

[0006]

The cross section of the conventional ventilated disk rotor (Aa cross section: FIG. 2)
For example, as shown in FIG. 3, the fins have a structure that extends radially in a curved or straight line, and
The thickness of the fin was the same in the outer peripheral portion and the inner peripheral portion. In other words, by making the fins curved, the contact area between the fins and the cooling air is increased, and by making the entire fins as thick as possible, a large amount of heat is conducted from the disk rotor to the fins, thereby increasing the cooling efficiency. Was raised. However, in the ventilated disk rotor having such a structure, the frontage of the inner peripheral side opening is narrower than the width of the frontage of the outer peripheral side opening, so that the ventilated space can flow from the inner peripheral side opening. Since the amount of cooling air is limited, there is a problem that the cooling efficiency is rather deteriorated.

[0007] The present invention has been made in view of the above points, and has as its object to provide a ventilated disk rotor with improved cooling efficiency.

[0008]

In order to achieve the above-mentioned object, a ventilated disk rotor according to the present invention is connected to a rotating body, is disposed opposite to each other at intervals, and has sliding surfaces on both outer sides. An inner disk and an outer disk, a plurality of fin members radially extending and arranged in the circumferential direction and connecting between the opposing surfaces of the two disks, and a fin member that is partitioned by the fin members adjacent to the opposing surfaces of the two disks A ventilating disk rotor having a ventilation space penetrating from the inner peripheral opening to the outer peripheral opening, wherein the fin member is such that the inner peripheral tangent is closer to the center of the disk than the outer peripheral tangent. It is a curved shape that is directed, and the inner peripheral end portion is formed to be tapered, and a large flow rate of air is secured at the inner peripheral side opening. Those were.

According to the above configuration, the amount of cooling air flowing into the ventilation space from the inner peripheral opening can be increased, and heat can be efficiently exchanged between the fin member and the cooling air. . That is, by forming the inner peripheral end portion of the fin member to be tapered, the interval between the adjacent fin members can be increased accordingly (that is, the frontage of the inner peripheral opening portion can be widened). Further, by making the inner peripheral tangent of the fin member point toward the center of the disk from the outer peripheral tangent, more cooling air flowing from the inner peripheral opening is directed toward the outer peripheral opening. Cooling air can be brought into contact with the fin members. As described above, according to the present invention, more air for cooling the disk rotor can be taken into the ventilation space, and the taken-in air can be brought into efficient contact with the fin members for heat exchange. Therefore, the cooling efficiency of the ventilated disk rotor can be improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. A ventilated disk rotor according to the present invention will be described with reference to the drawings. FIG.
1 is a sectional view conceptually showing a section (Aa section: see FIG. 2) of a ventilated disk rotor to which an embodiment of the present invention is applied. However, in FIG. 1, a part is omitted for easy understanding of the description.

The ventilated disk rotor 1
Is used for a ventilated disc brake for a vehicle or the like, is fixed to the wheel side, and rotates integrally with the wheel. The appearance of the disk rotor 1 is not different from the conventional disk rotor 1 shown in FIG. That is, the disc-shaped in-side disc 2 and the out-side disc 3 are arranged facing each other at an interval in the vehicle width direction, and the facing surfaces of both discs 2 and 3 are integrally connected by a plurality of predetermined fins 5. (See FIG. 2).

A through hole 4 is opened centering on the center of the in-side disk 2 (or the out-side disk 3), and the fins 51 to 53 are provided so as to surround the through hole 4. The fins 51 to 53 have fins of different lengths (long fins 51 and 53 and short fins 52) alternately, and the outer peripheral tips of the fins 51 to 53 are connected to the in-side disk 2 (or , Are arranged on the circumference of a concentric circle centered on the center of the out-side disk 3). That is, the fins 51 are radially displaced from the center of the disk rotor 1 and the positions of the inner peripheral ends between the adjacent fins are alternately shifted.
To 53 are arranged.

The shapes of the fins 51 to 53 are formed such that the inner peripheral side is more inward, that is, curved so as to be directed toward the center of the disk 2 (3). As a specific example, as shown by the fin 51 in FIG. 1, the angle formed by the tangent at the curved portion of the fin inner peripheral end with respect to the radial direction of the disk 2 (3) on the inner peripheral side is 15 degrees. On the other hand, on the outer peripheral side, the angle formed by the tangent at the curved portion at the distal end on the outer peripheral side of the fin is formed at 30 degrees with respect to the radial direction of the disk 2 (3). In other words, the closer to the inside of the fins 51 to 53, the more the direction of the center of the disk 2 (3) is directed. Therefore, the air flow rate can be increased. The angle of each of the fins 51 to 53 may be arbitrary. For example, the angle on the inner peripheral side may be 0 degree, and the angle on the outer peripheral side may be 15 degrees. Note that this angle may be the same in all or some of the fins 51 to 53, or
1 to 53 may be different. Further, all the inner peripheral end portions of the fins 51 to 53 are formed in a tapered (i.e., wedge) shape in which both ends are inclined.

As described above, when the disk rotor 1 comes into contact with a brake pad (not shown) fixedly mounted at a predetermined position, friction occurs at a sliding portion between the disk rotor 1 and the brake pad. Heat is generated. This frictional heat is applied to the fins 5 which are formed integrally with the sliding portion.
Heat is transferred to 1 to 53 and stored. When the disk rotor 1 rotates in the direction of the arrow X, cooling air is taken in from the inner peripheral openings of the fins 51 to 53, and a series of air paths (arrow Y) discharged to the outer peripheral openings of the fins 51 to 53 are formed. It is formed along 51-53. At this time, the inflow amount of the cooling air taken in from the inner peripheral side opening is proportional to the interval between the adjacent fins 51 to 53 on the inner peripheral side. That is,
The greater the spacing, the greater the inflow of cooling air. The disk rotor 1 according to the present invention shown in FIG. 1 has the thickness of the fins 52 and the tip portions of the fins 51 to 53 inclined compared to the conventionally known disk rotor 1 shown in FIG. The gap between the inner peripheral side opening portions is formed to be wider by the amount of the gap. That is, the taken-in cooling air flows in more than before. Therefore, fin 5
Heat exchange between the cooling air and the cooling air is performed more frequently, so that the disk rotor 1 can be cooled quickly. Of course, the disk rotor 1
Needless to say, as the rotation speed of the disk rotor 1 increases, more cooling air can be taken in a shorter time and the disk rotor 1 can be cooled more quickly.

The present invention is not limited to the embodiment described above, and various modifications as described below are possible. In the above-described embodiment, the division type disk rotor is shown as an example. However, the present invention is not limited to this, and the present invention can of course be applied to a non-division type disk rotor. Further, as for the shape of the fins, the inner peripheral tips of all the fins may not be wedge-shaped, but the inner peripheral tips of only some of the fins may be formed in a wedge shape.

[0016]

As described above, according to the present invention, it is possible to provide a ventilated disk rotor with high cooling efficiency which can efficiently take in cooling air and release the heat stored in the fins. Can be obtained. Further, since it is not necessary to particularly change the structure of the disc brake device itself, an effect is obtained that the disc brake device can be easily applied to an existing ventilated disc brake device.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view schematically showing a configuration example of a ventilated disk rotor according to one embodiment of the present invention.

FIG. 2 is a perspective external view showing an overall configuration example of a conventionally known ventilated disk rotor.

3 is a schematic cross-sectional view of the ventilated disk rotor shown in FIG. 2 taken along the line Aa.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disk rotor 2 In side disk 3 Out side disk 4 Through hole 5 (51-53) Fin 6 Ventilation space

Claims (2)

[Claims] An inner disk and an outer disk which are connected to a rotating body and are opposed to each other with a space therebetween, and have sliding surfaces on both outer sides, and a plurality of radially extending and circumferentially arranged inner and outer disks. A ventilated space provided with a fin member connecting between the opposing surfaces, and a ventilation space defined by the fin members adjacent to the opposing surfaces of the two disks and penetrating from the inner peripheral opening to the outer peripheral opening of the disk; A disk rotor, wherein the fin member has a curved shape such that an inner peripheral side tangent is more directed toward the center of the disk than an outer peripheral side tangent,
A ventilated disk rotor, wherein an inner peripheral end portion is tapered, and a large air flow rate is secured at the inner peripheral opening. 2. The fin member according to claim 1, wherein said fin members are alternately shifted such that the positions of the inner peripheral end portions of said fin members are different radial positions of said disk for each of adjacent fin members.
A ventilated disk rotor according to item 1.