JP2000274463A - Disc rotor and disc brake device using the disc rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventilated type disc rotor being high in rigidity in the direction of a rotary shaft. SOLUTION: A plurality of fins 2-6 each formed in a linear symmetrical shape are situated between rotary discs 1a and 1b, which are integrally supported, and situated in a zigzagging state and a laterally symmetrical state on a whole on a concentric circle. A plurality of cooling air passages 8 and 9 cross each other and are partitioned laterally symmetrically between the rotary discs 1a and 1b by a plurality of the fins 2-6, and blow by from the inside toward the outside in a radial direction. During braking, not according to the position of a brake pad 7 to the slide part of the rotary disc 1b, a pad bearing pressure is always sufficiently supported by the fins 2-6 and bending in a rotation direction of the slide part is low. This constitution suppresses the generation of break squeal during braking and the generation of noise due to vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk rotor and a disk brake device using the same, and more particularly to a fin arrangement and a shape of a ventilated disk rotor.

[0002]

2. Description of the Related Art A disc brake disk rotor is a solid type using one rotating disk, and a bench in which both rotating disks are integrated with a plurality of fins (ribs) so that a gap is formed between two rotating disks. There is a rated type.

At present, the mainstream of commercially available disk rotors is of the ventilated type, which has elongated straight fins as disclosed in Japanese Patent Application Laid-Open No. 8-164828. 2 (A) and 2 (B) are views for explaining the shape of the disk rotor according to this conventional example, and FIG. 2 (A) is a plan view in which one of the rotating disks is omitted. (B) is the same side view. FIG. 2 (A) and FIG.
Referring to (B), in the disk rotor, a plurality of straight fins 102 are provided between a pair of opposed rotating disks 101a and 101b to integrally connect the rotating disks 101a and 101b. I have. The straight fins 102 are respectively rotating disks 101a, 101
b, extending along the radial direction of the rotating disk 101a,
It is arranged at equal intervals along the circumferential direction of 101b, and ventilation holes 103 are formed between the straight fins 102. The straight fins 102 generate an air flow when the disk rotor rotates, and this air flow promotes heat dissipation of heat accumulated in the rotating disks 101a and 101b during the braking operation.

[0004]

However, the above-mentioned prior art has the following problems.

[0005] The first problem is that abnormal noise due to brake squeal and vibration is generated during the braking operation.

The reason for this is that in order to generate a sufficient cooling air flow between the rotating disks and ensure heat radiation, the fin spacing must be increased, but on the other hand, by increasing the fin spacing, the rotating disk is increased. As a result, during braking, that is, when the sliding surface of the rotating disc is pressed in the direction of the rotating axis by the brake pad, the surface pressure of the brake pad causes the rigidity of the rotating disc to decrease. This is because a portion having no fins on the back side is bent, which causes abnormal noise due to brake squeal and vibration.

In order to prevent this, it is conceivable to increase the number of fins or to increase the thickness of the sliding portion of the rotating disk. However, these measures lead to an increase in the weight of the disk rotor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a disk rotor having high rigidity in the direction of the rotation axis of the disk rotor, thereby suppressing generation of abnormal noise due to brake squeal and vibration during braking of the disk brake, and a disk using the same. It is to provide a braking device.

[0009]

A plurality of fins of a disk rotor according to the present invention are formed between rotating disks facing each other to support the rotating disks, have line-symmetric shapes, and are symmetrically distributed. Is done. The plurality of air paths provided in the disk rotor according to the present invention are defined by a plurality of fins between the rotating disks, intersect with each other and are arranged symmetrically, and blow through from the radially inner side to the outer side of the rotating disk. In this specification, “left-right symmetry” means “symmetric with respect to a plane including the rotation axis”.

According to the disk rotor of the present invention, generation of abnormal noise due to brake squeal and vibration is suppressed by the unique fin shape and arrangement. The reason is that when braking,
This is because when the sliding portion of the rotating disk is pressed by the brake pad, the amount of displacement of the sliding portion in the rotation axis direction is reduced.

According to the present invention, disk rotors having the same structure can be attached to the left and right wheels of a vehicle. The reason is that, in the disk rotor of the present invention, the shape and arrangement of the fins are bilaterally symmetric. Because it is done. Therefore, according to the disk rotor of the present invention, generation of abnormal noise due to brake squeal and vibration can be suppressed during running of the vehicle regardless of the rotation direction of the wheels.

Further, according to the present invention, the fin surface area, the number of air passages, and the flow cross-sectional area are increased as compared with the above-described conventional disk rotor, so that the heat radiation capability is improved.

[0013] In addition, according to the present invention, the fins and the air passage (cooling air passage) are formed symmetrically, so that the design cost, and especially when the disk rotor is manufactured by the casting method, the molding, Manufacturing costs such as casting are reduced.

The air path according to the present invention blows from the inside to the outside along the radial direction of the rotating disk. This prevents sand clogging during core molding and poor molten metal fluidity during casting, particularly when a disk rotor is manufactured by a casting method.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described.

In a preferred embodiment of the disk rotor according to the present invention, a plurality of fins are arranged on a plurality of concentric circles each centered on the center of the rotating disk, and further, fins located on different concentric circles and adjacent to each other are arranged. They are arranged in a staggered manner so as to have one side facing each other substantially in parallel. Further, an air path extends between one side of each fin that is substantially parallel and opposed. Preferably, the plurality of fins are respectively arranged on three or more (three or more rows) concentric circles.

In a preferred embodiment of the disk rotor according to the present invention, a plurality of fins are respectively arranged on a plurality of concentric circles centered on the center of the rotating disk, and a plurality of fins are located at an outermost peripheral portion and an innermost peripheral portion. The fin has a substantially triangular cross section as viewed in the direction of the rotation axis of the rotating disk, and a plurality of fins located between the outermost peripheral portion and the innermost peripheral portion have substantially quadrangular cross sections in the same direction.

In a preferred embodiment of the disk rotor according to the present invention, a plurality of fins are arranged on a plurality of concentric circles each having the center of the rotating disk as a center, and the rotating disk circle of the fin located on one concentric circle is provided. The length along the circumferential direction is longer than the interval along the circumferential direction of the rotating disk between the fins located on other adjacent concentric circles. Alternatively, the length of the fins along the circumferential direction of the rotating disk is longer than the circumferential interval between the fins of another row adjacent to the rotating disk in the radial direction (radial direction), and the fins are staggered. It is arranged in a shape. Thus, the amount of deflection of the sliding surface (friction surface) of the rotating disk along the rotation axis direction (thickness direction) can always be reduced, and generation of abnormal noise due to brake squeal and vibration is suppressed.

In a preferred embodiment of the disk rotor according to the present invention, a plurality of fins are respectively arranged on a plurality of concentric circles centered on the center of the rotating disk, are located on different concentric circles, and are arranged in a radial direction of the rotating disk. A plurality of fins scattered in an arc at a predetermined angle in the circumferential direction constitute a set of arc fin rows, and the plurality of arc fin rows are juxtaposed along the circumferential direction of the rotating disk. (It is orbiting).

In a preferred embodiment of the disk rotor according to the present invention, the arc-shaped fin rows are arranged so as to intersect with each other, and the air passages defined between the arc-shaped fin rows are intersected with each other. I have.

In a preferred embodiment of the disk rotor according to the invention, the fins are distributed so that the fins disperse the stress applied to the rotating disk.

In a preferred embodiment of the disk rotor according to the present invention, the corners of the fins are formed to be acute, obtuse or curved. When the fin is manufactured by casting, it is preferable to form the corner of the fin into an obtuse or curved shape.

In a preferred embodiment of the disk brake according to the present invention, the disk rotor according to the preferred embodiment described above, a brake pad that presses and slides the rotating disk of the disk rotor, Means for making a stroke along the direction of the rotation axis.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the preferred embodiments of the present invention described above, an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view of a disk rotor according to an embodiment of the present invention, and is a partially broken plan view in which a part of one rotating disk is broken. Referring to FIG. 1, this disk rotor has two opposed rotating disks 1a and 1b, and between the rotating disks 1a and 1b in the rotation axis direction, they are integrally connected and supported. Fins 2 to 6 are dispersedly formed. A hole for inserting a rotating shaft is formed at the center of the rotating disks 1a and 1b, and a flange for attaching the rotating shaft is formed at an inner peripheral portion thereof. The rotating disk 1b has a sliding surface against which the brake pad 7 is pressed and slidably contacted on the outer surface of the outer peripheral portion. The brake pads 7 are movable by stroke means (not shown), and press against the sliding surfaces of the rotating disks 1b during braking to slide on each other, and are separated from the sliding surfaces during non-braking.

Next, the fin arrangement and individual fin shapes will be described in detail. These fins 2 to 6 are arranged at least symmetrically as a whole, actually in a rotational axis symmetry and in a staggered manner, and are arranged in order from the outer periphery to the inner periphery of the rotating disk 1a. A plurality of first-row fins 2, a plurality of second-row fins 3, a plurality of third-row fins 4, a plurality of fins 4, and a plurality of fins, which are respectively arranged on concentric circles having the center of 1a as a center. And a plurality of fins 6 in the fifth row. Fins 2 to 6 in the same row have the same shape as each other,
Each has a line-symmetrical shape, specifically, a shape symmetrical about an axis along the radial direction. The circumferential lengths of the fins 2 to 6 in the first to fifth rows are each longer than the circumferential distance between the fins in another row adjacent in the radial (radial) direction. For example, referring to the vicinity of an imaginary line indicating the left end surface of the brake pad 7 in FIG. 1, the left corners of the fins 4 in the third row are adjacent to the second and fourth fins.
From the radial line connecting the right corners of the fins 3 and 5 in the row,
It is located on the left. The same applies to the right side.

In the cross section obtained by cutting the fins 2 to 6 in the first to fifth rows along the rotating direction of the rotating disk (cross section viewed from the direction of the rotation axis), the cross-sectional shape of the fin 2 in the first row is A substantially triangular shape whose corner faces inward in the radial direction of the rotating disk, the second
The cross-sectional shape of the fins 3 in the row is substantially square, the cross-sectional shape of the fins 4 in the third row is substantially rhombic, and the cross-sectional shape of the fins 5 in the fourth row is the rotating disk radial direction from the fins 4 in the third row. The cross-sectional shape of the fins 6 in the fifth row is a substantially triangular shape whose apex angle is directed outward in the radial direction of the rotating disk. The fins 2 to 6 in the first to fifth rows each have one side substantially parallel to each other.

The first to fifth rows of the fins 2 to 6 extending in an arc shape at a predetermined angle in the radial and circumferential directions of the rotating disk 1a constitute a set of arcuate fin rows. are doing. These arcuate fin rows are juxtaposed along the circumferential direction of the rotating disk 1a, and the arcuate fin rows extending in opposite directions along the circumferential direction (rotation direction) intersect with each other. (Substantially orthogonal).

First cooling air passages 8 are defined between the arc-shaped fin rows extending rightward in FIG. 1 from the radially inner side to the outer side of the rotating disk 1a. I have. These first cooling air passages 8 are juxtaposed along the circumferential direction of the rotating disk 1a. On the other hand, second cooling air passages 9 are respectively formed between the arc-shaped fin rows extending leftward in FIG. 1 from the radially inner side to the outer side of the rotating disk 1a. The second cooling air passages 9 are juxtaposed (substantially orthogonal) to the first cooling air passages 8 along the circumferential direction of the rotating disk 1a.

Next, the function of the disk rotor and the operation during braking will be described.

Referring to FIG. 1 again, when braking the rotation of the disk rotor, the brake pad 7 is pressed against the sliding surface of the rotating rotating disk 1b by the stroke means and slides against each other. In this disk rotor, since the fins 2 to 6 in the first to fifth rows are distributed, the number of fins located immediately below the brake pad 7 is always large, and the total number of fins located immediately below the brake pad 7 is increased. The cross-sectional area always exceeds a predetermined value.

In other words, during braking, regardless of the relative positional relationship between the rotating disk 1b and the brake pad 7,
The surface pressure from the brake pad 7 is sufficiently supported by the fins 2 to 6 in the first to fifth rows. As a result, during braking,
The displacement (deflection) of the rotating disk 1b in the rotation axis direction is reduced, and the generation of abnormal noise due to brake squeal and vibration is suppressed. In addition, since the fins 2 to 6 in the first to fifth rows are arranged at least symmetrically, the rotating disks 1a and 1b
, The amount of displacement of the rotating disk 1b in the rotation axis direction is always reduced.

When the disk rotor rotates, cooling air is generated between the rotating disks 1a and 1b. Since a large number of fins 2 to 6 are dispersedly arranged between the rotating disks 1a and 1b, a sufficient heat radiation area is secured in the disk rotor. In this disk rotor, the fins 2 to 6 and the first and second cooling air passages 8 and 9 are formed bilaterally symmetric (further symmetrically with respect to the rotational axis), so that the rotating disks 1a and 1b rotate. Regardless of the direction, the same heat radiation ability is exhibited.

[0034]

The first effect of the present invention is that the braking pad surface pressure is always sufficiently supported by the fins during braking, regardless of the position of the brake pad relative to the sliding portion of the rotating disk. That is, the displacement of the sliding portion in the rotation axis direction is always reduced.

The second advantage of the present invention is that the fins have high symmetry in the shape and overall arrangement, and the total surface area of the fins is large, so that sufficient heat radiation can be achieved during braking regardless of the rotation direction of the disk rotor. Is to be done.

A third effect of the present invention is that manufacturing costs are reduced because the fins are symmetrically arranged.

A fourth effect of the present invention is that when the disk rotor according to the present invention is manufactured by a casting method, molding and casting are easy.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a disk rotor according to an embodiment of the present invention, and is a partially broken plan view in which a part of one rotating disk is broken.

FIGS. 2A and 2B are explanatory views of a disk rotor according to a conventional example, in which FIG. 2A is a plan view omitting one rotating disk, and FIG. 2B is a side view thereof.

[Explanation of symbols]

 1a, 1b Rotating Disk (Rotating Disk) 2 First Row Fins 3 Second Row Fins 4 Third Row Fins 5 Fourth Row Fins 6 Fifth Row Fins 7 Brake Pads 8th 1 cooling air path 9 second cooling air path

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yukio Iwata 19-5 Nihonbashi Koamicho, Chuo-ku, Tokyo F-term in Akebono Brake Industry Co., Ltd. (reference) 3J058 BA21 BA23 CB23 DE05 FA01

Claims (8)

[Claims] A rotating disk opposed to each other, a plurality of fins formed between the rotating disks facing each other to support the rotating disk, each having a line-symmetric shape, and symmetrically distributed; A plurality of air paths defined by the plurality of fins between the rotating disks, intersecting each other and symmetrically disposed, and blowing through from the radially inner side to the outer side of the rotating disk. Disc rotor. 2. A plurality of fins are respectively arranged on a plurality of concentric circles centered on the center of the rotating disk, and adjacent fins located on different concentric circles and adjacent to each other are substantially parallel to each other. 2. The disk rotor according to claim 1, wherein the air passages are arranged in a staggered manner so as to have the respective air paths, and the air path extends between the sides facing each other in a substantially parallel manner. 3. A method according to claim 1, wherein the plurality of fins are arranged on a plurality of concentric circles centered on the center of the rotating disk, respectively.
The rotating disk rotation axis direction cross section is formed in a substantially triangular shape, and the rotation disk rotation axis direction cross section of the plurality of fins located between the outermost peripheral portion and the innermost peripheral portion is formed in a substantially square shape. The disk rotor according to claim 1, wherein: 4. The plurality of fins are respectively arranged on a plurality of concentric circles centered on the center of the rotating disk, and the length of the fins located on one of the concentric circles along the circumferential direction of the rotating disk. 2. The disk rotor according to claim 1, wherein a distance between the adjacent fins located on the concentric circle is longer than a distance along a circumferential direction of the rotating disk. 5. A plurality of fins are respectively arranged on a plurality of concentric circles centered on the center of the rotating disk, and are located on different concentric circles, and have predetermined angles in a radial direction and a circumferential direction of the rotating disk. Wherein the plurality of fins scattered in an arc form a set of arc fin rows, and that the plurality of arc fin rows are juxtaposed along a circumferential direction of the rotating disk. The disk rotor according to claim 1, wherein: 6. The disk rotor according to claim 5, wherein the arc-shaped fin rows cross each other, and the air passages defined between the arc-shaped fin rows cross each other. 7. A plurality of fins are respectively arranged on first to fifth concentric circles in order from the outside to the inside of the rotating disk, each centering on the center of the rotating disk. The fins located on one concentric circle have a substantially triangular cross-section in the direction of the rotation axis of the rotating disk, and the apex angle thereof faces inward of the rotating disk, and the fins located on the second concentric circle The cross section of the rotating disk in the rotation axis direction is substantially square, and the fin located on the third concentric circle has a substantially rhombus-shaped cross section in the rotation disk rotation axis. A section of the fin located in a direction of the rotation axis of the rotating disk, which is substantially rhombus elongated in a radial direction of the rotating disk from a third row of fins, and the fin located on the fifth concentric circle; The rotary disk rotation axis direction cross-section, the disc rotor according to claim 1, wherein the apex angle a substantially triangular shape and wherein the facing the rotary disc outward. 8. A disk rotor according to claim 1, a brake pad which presses a rotating disk of said disk rotor and slides against each other, and said brake pad is moved in a direction of a rotation axis of said rotating disk. Means for causing a stroke.