JPH0327773B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disc brake device for motorcycles (including tricycles).

In the case of a type of disk in which a large number of through holes 1a are bored along the circumferential direction of the disk 1 for the purpose of draining water or reducing the weight of the disk itself, as shown in FIGS. 1a and b. As the disk 1 rotates in the direction of arrow A, a pair of pads 3a and 3b assembled to the carrier body 2 simultaneously close and open both open ends of the through hole 1a. The internal air may vibrate and produce continuous noise. In addition, to roughly explain the disc brake device shown in the figure, a large number of through holes 1a are bored in the circumferential portion near the outer peripheral end of the disc 1, but these are not limited to the circular shape as shown. When the brakes of the vehicle are applied, a hydraulic piston (not shown) in the caliper body 2 operates to form a hole in the pair of pads 3a and 3b on both sides near the outer peripheral edge of the disc 1, that is, the through hole 1a. This is a structure in which the rotation of the disk 1 in the direction of arrow A is restrained by sandwiching and press-contacting the portion on both sides thereof.

An object of the present invention is to provide a disc brake device configured as described above, which is designed to prevent continuous generation of abnormal noise.

To achieve this objective, the present invention is characterized by the following configuration. That is, by assembling a set of pads on both sides of the disk in a shifted manner relative to the circumferential direction of the disk, the structure is such that both open ends of the through hole are not closed or opened at the same time, or a set of pads on both sides of the disk are assembled so as to be shifted from each other in the circumferential direction of the disk, so that both open ends of the through hole are not closed or opened at the same time. By keeping both ends aligned without causing any misalignment in the pad, and by making the shape of the through hole itself into an oblique hole, a hole with different diameters, etc., both open ends can be closed or opened at the same time. The goal is to prevent this from happening.

In other words, the present invention is characterized in that the line _X1 connecting the front and rear end surfaces of a pair of pads and the line connecting the peripheral edges of both opening ends of the through hole, that is, the edge extension line _X2 , are non-parallel. It is something to do.

Hereinafter, the present invention will be explained in detail with reference to the drawings. FIG. 2 is a circumferential sectional view showing the engagement of the disc 1 and a set of pads 3a, 3b of the disc brake device according to the embodiment. According to this figure, the end faces 3a' and 3b' of the pads 3a and 3b are assembled with a deviation of l. In the illustrated case, the pad 3a starts to close the through hole 1a earlier than the pad 3b with respect to the rotational direction (arrow A) of the disk 1, that is, the opening ends of the heat dissipation hole 1a are opened at different times. It shows how it is closed or opened. In the figure, d〓 represents the diameter of the through hole 1a.

On the other hand, as another means for satisfying the condition that both open ends of the through hole 1a are closed or opened with a time difference as described above, the end surfaces of the pads 3a, 3b
A similar result can be obtained when a' and 3b' are aligned as shown in FIG. 1b, and the hole shape of the through hole 1a is processed as shown in FIG. 3 a, b, c, d, etc. The figure sequentially shows a diagonal hole, a stepped hole, and two types of different diameter holes as examples.

After all, what the above two states mean is a line connecting each end surface 3a', 3b' of a pair of pads, or more precisely, a line connecting each corresponding end of the surface that pinches and presses both sides of the disk 1. If _{X 1} is the line connecting the peripheries of both opening ends of the through hole 1a, then X ₂ is _the line connecting the peripheries of both opening ends of the through hole 1a. The objective is to satisfy the condition that both open ends of 1a are not closed or opened at the same time. In addition, each pad 3 explained in FIG.
A and 3b are actually manufactured to have the same shape as shown in Fig. 4 a and b,
By attaching them to the assembly board on the side of the carrier pad 2 in a slightly biased manner (l ₁ > l ₂ ), the structure of the second embodiment is possible by setting this set on both sides in opposite directions. That is why.

Therefore, as is clear from the above explanation, according to the disc brake device of the present invention, it is possible to improve the performance by modifying the arrangement of a pair of pads or by modifying the shape of the through hole of the disc itself. Unlike the conventional type, it is possible to prevent the occurrence of abnormal noise during brake operation, and the structural principle is simple, and the effect brought about by this is great.

[Brief explanation of the drawing]

1A and 1B are a partial schematic view of a disc brake device of the type in which a through hole is provided in the disc, and a partial sectional view showing the connection between the pad and the disc through hole in the circumferential direction thereof. FIG. 2 is a sectional view showing an embodiment of the structure of the present invention, FIGS. 3 a, b, c, and d are sectional views showing an embodiment of a through hole, and FIGS. 4 a, b
2 is a plan view of the pad and a diagram of its assembly. Explanation of symbols of main parts, 1...Disk, 1a
...Through hole, 2...Caripa body, 3a, 3b
...A set of pads, 3a', 3b'... _The end face of each pad, l...The amount of deviation of a set of pads, X ₁ ...The line connecting the corresponding ends of each pressure contact surface of the pads, ……
A line connecting the edges of both opening ends of a through hole.

Claims (1)

[Claims] 1. A disc brake device in which an appropriate number of through holes are bored along the circumference near the outer peripheral edge of the disc, and a set of pads are clamped and pressed against both sides of the disc in the area where the through holes are distributed. In a circumferential surface along the circumferential direction of the disk passing through the center of the through hole, so that both open ends of the through hole can be closed or opened with a time difference by the pad, A disc brake device characterized in that a line connecting the peripheries of both opening ends of the through hole intersects with a line connecting corresponding ends of the pressing surfaces of the pair of pads.