JPS6027856B2 - disc brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disc brake, and particularly to a disc brake suitable for motorcycles and the like.

Disc brakes, which are constructed by fixing discs to both sides of a wheel hub and providing corresponding pads for each disc, are effective for increasing braking force and are used in large motorcycles and the like. In addition, in order to increase the frictional resistance between the disc and the pad and obtain a large braking force, a penetrating hole is formed in the contact surface of the disc with the pad, and the braking force is increased by the engagement between the hole and the pad. Disc brakes are used. In order to improve the braking force, it is desirable to provide a large number of small holes in the disc, but since the structural strength of the disc decreases accordingly, the number of holes is naturally limited. They were formed at predetermined intervals. However, in the secondary disc brake, the holes formed in each disc are formed at equal intervals in symmetrical positions narrowing the wheel hub, and therefore, when the brake is applied, the pads may come into contact with the holes. The frictional resistance between the two changes between when and when not, and this is transmitted to the car body via the caliper,
As a result, slight vibrations occur in the vehicle, which may also cause discomfort to the driver.

The present invention was made in consideration of such conventional disc brakes, and its purpose is to reduce the slight vibrations that occur in the vehicle due to the difference in frictional resistance between the disc and the pad. The objective is to provide disc brakes that do not cause discomfort. The inventor believes that the frictional resistance between the disc and the pad changes in magnitude and is transmitted to the vehicle. The present invention is based on the knowledge that although the frictional resistance is large, the frictional resistance between the other disk and the pad is small, and the synchronous vibration between the two disks and the pad is eliminated, thereby reducing the slight vibrations of the vehicle. This is what led to this. In the present invention, a disc is fixed to both sides of a wheel hub, a pad is placed in a position where it can come into contact with the disc and applies braking force to the wheel by applying narrow pressure to each disc, and a circle is formed on the contact surface between the disc and the pad. a plurality of holes formed at predetermined intervals in the circumferential direction, and the pad and the holes are arranged such that the relative positions of the pad and the hole are different on both disks when the pad is compressed. shall be.

Therefore, in the present invention, when the frictional resistance between one disc and the pad is large during brake operation, the frictional resistance between the other disc and the pad is not so large, and the frictional resistance between both discs and both pads is Since these do not change in size at the same time, the minute vibrations generated by brake operation are reduced, and the discomfort caused to the driver is also eliminated. Preferred embodiments of the disc brake according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows the shape of the front portion of a motorcycle to which an embodiment of the present invention is applied.

In FIG. 1, a disc 12 is integrally attached to a wheel 10, and a pad (not shown in FIG. 1) is built into a caliper 14 fixed to the vehicle body frame. It is configured to apply a braking force to the wheels 101 by compressing the disc 12 from both sides. Actuation of the pads within the caliper 14 is typically performed hydraulically. FIG. 2 is a cross-sectional view taken along the Rolo line in FIG. 1, and is an enlarged cross-sectional view of essential parts showing the structure of the embodiment according to the present invention.

FIG. 3 is a side view of an embodiment of the present invention, with the lower half omitted and only the upper half shown. The disc 12 is fixed to the wheel hub 11 at its center 16, and is bent slightly outward from this center 16 toward the outer periphery.
2 are bent parallel to each other. This outer peripheral portion 18 forms a contact surface with a pad built into the caliper 14. Therefore, as shown in FIG. 2, the pads 13 are placed in a position where they can come into contact with the outer periphery 18 of the disk 12, and by operating a hydraulic cylinder (not shown), the pads 13 on both sides are brought into contact with the outer periphery 18 of the disk 12. The portion 18 is compressed to apply a braking force to one wheel. Note that although the pad 13 is formed into a substantially rectangular shape in the case shown in FIG. 3, it is not limited to this. As shown in FIG. 3, a plurality of elongated holes 20, 20, 20, .

The elongated hole 20 is formed obliquely in the direction opposite to the rotational direction of the wheel indicated by arrow A in FIG. Also, the other disk 12
Also, as shown by the dotted line in FIG. 3, long holes 24, 24, 24, . . . are formed at predetermined intervals between the long holes 20 and the adjacent long holes 20. . That is,
Discs 12, 12 attached to both sides of the wheel hub 11
A long hole 20 and a long hole 24 formed in the outer circumferential parts 18, 18 are formed with positions shifted from each other.

Therefore, when the brake is applied, one pad 13
is in contact with the entire long hole 20, the other pad 13
does not come into contact with the outermost hole 24 at all, thereby reducing the slight vibrations of the vehicle. The operation of the embodiment according to the present invention constructed as described above is as follows.

First, the pad 13 in the caliper 14 is operated to compress the outer peripheral portion 18 of the disk 12. As a result, the pad 13 presses the outer peripheral portion 18 of the disk 12, but the third
The outermost hole 2 formed in the disk 12 on both sides as shown in the figure
0 and the long holes 24 are formed at different positions from each other, so when the frictional resistance between one disc and the pad is large, the frictional resistance of the other is small, and the frictional resistance of the entire disc brake fluctuates greatly. This will not happen and the braking force will work smoothly. Therefore, like a subordinate,
The contact between the pads 13, 13 and the elongated holes 20, 24 does not occur synchronously and intermittently, so that the slight tremors that occur during brake operation are reduced, and the discomfort caused to the driver is also eliminated. FIG. 4 shows the structure of another embodiment of the invention, in which the lower half of the disk 12 is omitted and only the upper half is shown.

In FIG. 4, instead of the long holes 20 and 24 shown in FIG. 3, a plurality of holes 26 are arranged as a group of a predetermined number, thereby increasing the frictional resistance with the pad 13.
Further, the arrangement of the holes 26 is such that they are inclined in the same direction as the rotational direction of the wheel indicated by arrow A, contrary to the embodiment shown in FIG. Furthermore, in the embodiment shown in FIG.
The holes 26 are located at exactly the same position on both disks 12, 12, but the positions of the pads 13, 13 are staggered as shown in FIG. In this embodiment as well, slight vibrations of the vehicle are reduced as in the first embodiment.

Furthermore, in this embodiment, the hole 26 is always in contact with either of the pads 13, 13, which reduces the difference in frictional resistance between the two discs and the pad, further reducing the vibration. In addition to reducing the amount of damage caused by the brakes, it is also possible to further improve braking performance. As explained above, according to the disc brake according to the present invention, there are discs fixed to both sides of the wheel hub, and pads that are placed in positions where they can come into contact with the discs and apply braking force to the wheels by compressing each disc. and a plurality of holes formed at predetermined intervals in the circumferential direction on the contact surface of the disk with the pad,
Since the pad and the hole are arranged so that the relative positions of the pad and the hole are different on both disks when the pad is under pressure, vibrations caused by fluctuations in frictional resistance that occur when the brake is applied are reduced. The brakes will be operated smoothly and accurately, and the discomfort of the driver will be eliminated.

[Brief Description of the Drawings] Fig. 1 is a side view showing a part of a motorcycle to which an embodiment of the present invention is applied, Fig. 2 is a sectional view taken along line 01n in Fig. 1, and Fig. The figure is a side view showing the structure of an embodiment according to the invention, and FIG. 4 is a side view showing the structure of another embodiment according to the invention. 10...Wheel, 12...Disc, 13...
...Pad, 20, 24, 26...hole. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 Discs fixed to both sides of the wheel hub, pads that are placed in contact with the discs and apply braking force to the wheels by compressing each disc, and a pad that extends in the circumferential direction on the contact surface between the pads of the disc. a plurality of holes formed at predetermined intervals, and the pad and the hole are arranged such that the relative positions of the pad and the hole are different on both disks when the pad is compressed. brake.