JP2000291703A - Disc brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exceedingly facilitate the checking, repair and exchange of components of a disc brake device to shorten working time required for them by providing a caliper with an attaching hole for fitting the small diameter part of a hydraulic piston, and abutting a stepped part formed in the hydraulic piston part against an end face on the side of a brake disc of the caliper to make the hydraulic piston removable from the caliper. SOLUTION: An attaching method of a piston to a caliper is altered in the fillowing way. Namely, in a disc brake device, a fitting hole 9 is bored in the caliper 2, and hydraulic piston parts 33, 34 are provided with a small diameter part 23 to fit in the fitting hole 9 of the caliper 2 and a stepped part 24 to abut against an end face 25 on the side of the brake disc of the caliper 2. The hydraulic piston parts 33, 34 can thereby attach and detach on the side of the brake disc of the caliper 2.

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 used in railways and the like, and more particularly to improvement in the maintainability of the disk brake device.

[0002]

2. Description of the Related Art Conventionally, in a railway vehicle or the like, a disk brake device is provided on each wheel to brake the vehicle. Such a disc brake device includes a brake disc that rotates integrally with each wheel, a pair of brake pads arranged so as to sandwich the brake disc, a hydraulic piston unit that presses the brake pad against the brake disc with hydraulic pressure, And a caliper for supporting the piston portion.

In such a disc brake device, the hydraulic piston portion is formed as a unit of a cylinder and a piston, and the hydraulic piston portion is inserted into a mounting hole provided in a caliper from a side far from the brake disk. And a collar provided on the cylinder is bolted to a surface of the brake caliper remote from the brake disc, and is mounted. That is, the reaction force of the pressure acting on the piston is received as the tensile force acting on the bolt.

Since the bogie frame protrudes to the caliper mounting portion, it is impossible to remove only the piston from the brake body when replacing the piston, and the bogie has to be removed from the brake main body and replaced, which requires a long working time. There was a problem.

An object of the present invention is to provide a disk brake device which solves these problems and has excellent maintainability.

[0006]

According to a first aspect of the present invention, there is provided a brake disk which rotates integrally with a wheel, a brake pad which abuts on the brake disk during braking to generate a braking force, and the brake pad is positioned at a predetermined position. A guide plate for guiding, a hydraulic piston portion having a cylinder and a piston for pressing the brake pad against the brake disc,
A caliper for mounting the hydraulic piston portion, a small-diameter portion that opens a mounting hole in the caliper and fits into the mounting hole of the caliper in the hydraulic piston portion, and a brake disk side end surface of the caliper. Is formed, and the hydraulic piston portion is detached from the caliper on the brake disk side.

According to a second aspect of the present invention, in the first aspect, the hydraulic piston portion is composed of a plurality of hydraulic piston portions, and these hydraulic piston portions are integrally connected movably to a brake disk side, and each of the hydraulic piston portions is internally provided therein. An oil passage is provided for connecting the hydraulic piston parts of the above.

[0008]

According to the first aspect of the invention, the caliper is provided with a mounting hole for fitting the small diameter portion of the hydraulic piston portion, and the step provided in the hydraulic piston portion is brought into contact with the end face of the caliper on the brake disk side. Since the hydraulic piston is removable from the caliper, the hydraulic piston is inserted into the caliper from the brake disc side, and the stepped portion receives the reaction force when pressing the brake pad. Since the repair and replacement can be performed very easily, the working time can be greatly reduced.

In the second invention, the hydraulic piston portion is constituted by a plurality of hydraulic piston portions, and these hydraulic piston portions are movably integrally connected to the brake disk side, and each hydraulic piston portion is connected to the inside thereof. Since the oil passage is provided, the replacement time of the hydraulic piston portion and the oil passage can be significantly reduced, and the piping of the oil passage can be simplified.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings.

FIGS. 1 and 2 show a state in which the disc brake device is mounted on a bogie. To explain this, four hydraulic piston parts 31 to 34 are attached to the caliper 2 in the vertical direction, and two hydraulic piston parts 32 and 33 inside the
Are integrally assembled via the rod 35.

FIG. 3 is a sectional view of a piston block. An oil passage 36 is provided in a rod 35, and a cylinder 33a and a piston 33b constituting a hydraulic piston portion 33 are provided.
The oil pressure is supplied to the oil chamber 33c defined as above.

The piston 33b is pressed against the brake disc 1 by the hydraulic pressure supplied from the oil passage 36 to generate a braking force. The oil passage 36 is connected to a hydraulic source (not shown).

The other hydraulic piston section 32 has the same configuration as the hydraulic piston section 33, and a description thereof will be omitted.

The hydraulic piston portions 32 and 33 have a large diameter portion 22 on the brake disk 1 side and a small diameter portion 23 on the bogie 30 side, and have a smaller diameter than the brake disk 1 side in a fitting hole 9 provided in the caliper 2. The part 23 is inserted. A groove 15 for a snap ring is provided in a portion of the hydraulic piston portions 32 and 33 projecting from the caliper 2, and the snap ring 4
The piston block 3 is fixed to the caliper 2.

The stepped portion 24 between the large-diameter portion 22 and the small-diameter portion 23 of the hydraulic piston portions 32 and 33 abuts on the end surface 25 of the caliper 2 on the brake disk 1 side. Each hydraulic piston part 32,
33 expands and contracts by hydraulic pressure guided through an oil passage 36 provided in the rod 35, and the hydraulic piston portions 32 and 33 press the brake disc 1 by hydraulic pressure during braking. 24.

The hydraulic piston parts 31, 3 located at the upper and lower ends
4 has a configuration described in Japanese Patent Application Laid-Open No. Hei 10-324242 by the present applicant, that is, it is attached to the caliper 2 by the anchor bolt 12 via the washer 13, and the hydraulic piston portion 31 on the lower end side is Leaf springs 17 are attached to both end surfaces perpendicular to the center line of the hydraulic piston portion, and guide holes 17a extending in the vertical direction are formed at substantially central portions thereof.

A guide pin 11 provided on the lower side surface of the caliper 2 is fitted into the guide hole 17a. By doing so, the hydraulic piston portion 31 is
By dropping to the lower end along a and rotating counterclockwise around the guide pin 11 in the figure, a sufficient space can be created when the brake pad 5, the piston block 3 and the like are removed from the caliper 2. .

The upper hydraulic piston section 34 does not have the function of guiding the lower hydraulic piston section 31.

Brake disk 1 and hydraulic piston 31
And 34, a brake pad 5 positioned by a guide plate 6 is mounted. Hydraulic pressure acts on the brake pad 5 via hydraulic piston parts 31 to 34, and the brake pad 5 presses against the brake disc 1. The braking force is generated by the friction.

The guide plate 6 is rotatable about the piston shaft of the upper hydraulic piston part 34.
In the case where only the piston block 3 is exchanged, the guide plate 6 rotates about the piston axis of the upper hydraulic piston portion 34,
A space in which the piston block 3 can move toward the brake disk 5 can be secured.

In the figure, reference numeral 14 denotes a hydraulic piston portion 31 to 3
4 is a dust cover which is also received so that dust does not enter the inside of the cover. FIGS. 4 to 6 show a procedure for removing the piston block 3.

First, FIG. 4 shows the removal of the brake pad 5. First, the anchor bolt 12 and the washer 1 for attaching the lower end hydraulic piston portion 31 to the caliper 2 are shown.
3 and remove the lower hydraulic piston part 31 with the guide hole 1
7a, the hydraulic piston 31 is rotated counterclockwise around the guide pin 11, and the brake pad 5 is placed between the hydraulic piston 31 and the brake disc 1.
To the bottom.

Next, as shown in FIGS. 5 and 6, the snap ring 4 which restrains the piston block 3 on the caliper 2 is removed, and the piston block 3 is pushed out of the caliper 2 toward the brake disk 1 and lowered to be removed. . At this time, the work is easier if the lower end side hydraulic piston portion 31 and the guide plate 6 are removed in advance.

Although the dust cover 14 is moved until it is deformed in the drawing, it is needless to say that excessive deformation should be avoided as much as possible in consideration of the performance of the dust cover 14.

In FIG. 6, the upper hydraulic piston portion 34 is not removed.
4 is to remove the anchor bolt 12
The explanation is omitted because it is performed without any problems.

As described above, according to the present invention, the caliper 2 has the fitting hole 9 opened, the hydraulic piston portions 32 and 33 have the small-diameter portion 23 fitted into the fitting hole 9 of the caliper 2, and the brake of the caliper 2. Providing the step portion 24 in contact with the disk side end surface 25 makes it possible to disassemble only the piston block 3 from the bogie 30 without removing the brake body from the bogie 30, and to inspect and repair the components of the disc brake device. Since the replacement can be performed very easily, there is an effect that the working time can be greatly reduced.

The present invention can be employed regardless of the type of disc brake. For example, the present invention can be applied to a floating type caliper or a disc brake using an opposed piston.

[Brief description of the drawings]

FIG. 1 is a front view showing an assembled state of an embodiment of the present invention.

FIG. 2 is a side view showing an assembled state of the embodiment of the present invention.

FIG. 3 is a sectional view showing the configuration of the hydraulic piston unit.

FIG. 4 is an explanatory diagram showing a replacement procedure of the embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a replacement procedure of the embodiment of the present invention.

FIG. 6 is an explanatory view showing a replacement procedure of the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Brake disk 2 Caliper 3 Piston block 5 Brake pad 6 Guide plate 9 Fitting hole 11 Guide pin 12 Anchor bolt 22 Piston large diameter part 23 Piston small diameter part 24 Step part 25 Brake disk side caliper end face 30 Dolly 31 Lower end caliper hydraulic piston Parts 32, 33 Piston block hydraulic piston part 33a Cylinder 33b Piston 33c Oil chamber 34 Upper caliper hydraulic piston part 35 Rod 36 Oil passage

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J058 AA53 AA62 AA69 AA73 AA77 AA87 BA70 CC03 CC22 CC32 CD20 DD03 FA21

Claims (2)

[Claims] A brake disk that rotates integrally with a wheel, a brake pad that generates a braking force by contacting the brake disk during braking, a guide plate that guides the brake pad to a predetermined position, A disc brake device comprising: a hydraulic piston portion having a cylinder and a piston pressed against a brake disc; and a caliper for mounting the hydraulic piston portion. A mounting hole is opened in the caliper, and a mounting hole for the caliper is formed in the hydraulic piston portion. A disc brake device comprising: a small-diameter portion that fits into a brake disc; and a step that abuts on the end face of the caliper on the brake disc side, and the hydraulic piston portion is detached from the brake disc side of the caliper. 2. The hydraulic piston part is composed of a plurality of hydraulic piston parts, these hydraulic piston parts are integrally connected movably to a brake disk side, and an oil passage connecting each hydraulic piston part is provided therein. The disk brake device according to claim 1, wherein the disk brake device is provided.