JPS5925894B2 - disc brake - Google Patents

Description

[Detailed description of the invention] The present invention relates to a disc brake.

The invention particularly relates to a housing having a radial opening for accommodating two brake pads that are slidable relative to at least one mounting pin supported on a Ujifugu; and at least one noise-reducing spring that presses the pad radially inwardly of the disc.

Disc brakes typically have a device that dampens vibrations that occur when the pad lining engages the disc during brake operation.

The damping device is generally a leaf or wire spring supported at at least three points.

Two of these support points are typically located at the edge portion of the pad radially outward of the disk and the portion of the pin radially inward of the disk, and a third point is located at the edge portion of the pad radially outward of the disk, and a third point is located at the edge portion of the pad radially outward of the disk and the third point is located at the edge portion radially inward of the disk of the other pad-mounted pin. on the inner part, on other parts of the disc radially outer edge of the pad, or on parts of the brake housing.

All known springs act by leverage to push the pad towards the interior of the brake, and two of these points of support limit the arm and the third point gives the spring an initial tension. Since this is a support point that causes , three support points are required.

Although this type of arrangement works satisfactorily in operation, the installation of the spring into the brake is not satisfactory and requires precision work requiring accurate assembly and requires very special tools.

To overcome this drawback, the invention provides that the spring has a central part of substantially U-shaped cross section, and one arm of the U-shape bounded by the spring extends between the pads in the radial direction of the disk of the pin. an axial arm supported on an inward portion and the other arm extending from the convolution parallel to the axis of the pin and supported on a radially outward edge portion of one of the pads; , a support point between the one arm and a portion of the pin on the inner side in the disk radial direction, and a support point between the axial arm and the edge portion of one of the pads on the outer side in the disk radial direction, A disc brake of the above type is proposed, characterized in that it is located substantially on a radial plane of the disc passing through the axis of the disc brake.

With this configuration, the spring requires only two support points,
It will be appreciated that this particularly facilitates the mounting of the spring.

In a particular embodiment of the invention, the springs are supported on the radially inboard portions of the pins between the pads and on the radially outward edges of each butt.

In addition to the mounting case described above, this arrangement allows for a spring to be mounted on each mounting pin, so that if one pin or one spring were to break, it would not previously be possible to remove other components. However, it can be replaced without requiring removal of other parts.

An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, the disc brake includes a housing 10 that is secured to a stationary element, such as a short axle (not shown) of a vehicle.

The housing 10 straddles a rotating disc 12, the part of the housing straddling the disc having a radial opening 14 which accommodates two brake friction pads 16 and 18.

In this embodiment, the pad is supported on the axial edge of the aperture 14 and mounted on two mounting pins 20 and 22 that are received within holes in the circumferential edge of the aperture 14.

Brake application devices (not shown), such as piston and cylinder units, are mounted in housings 7 on each side of disc 12 to press friction pads 16 and 18 onto corresponding friction surfaces of disc 12 to apply the brakes. I do.

However, the invention is not limited to this type of brake, but also those in which the nozzle can slide relative to a fixed support and the brake application device is provided only on one side of the brake disc. The same applies to brakes.

Noise reduction springs 24 and 26 are mounted on mounting pins 20 and 22, respectively.
The pads 16 and 18 are affixed to resiliently press the pads 16 and 18 radially toward the interior of the brake.

Each spring 24, 26 consists of a metal strip, the central part of which has a substantially U-shaped cross-section, and the spring is defined by its closed part or
The bottoms of the shapes are placed back to back.

As shown in FIG. 2, the lower (disk radially inward) arm 28.30 of the U-shape bounded by each d-neck 24.26 is connected to the lower (disc radially inward) arm 28.30 of the corresponding pin 20 or 22. It is bent so that it is supported by the inner part).

The upper (disk radially outward) arms of the U-shape extend axially on either side of the U-shape to form two symmetrical arms 32 on each spring 24,26.

As shown in FIGS. 3 and 4, each arm 32 is slightly angled toward the interior of the brake from the center of the U-shaped portion of each spring 24,26.

The ends of the arms 32 are therefore supported on the portion of the upper (disc radially outward) edge 34 of each pad 16.18;
Since this edge portion is aligned with the mating pin 20 or 22, the initial tension stored in each spring 24,26 is exerted substantially gradually in the radial direction, in other words, the spring 24. and 26 do not require leverage to force pads 16 and 18 toward the interior of the brake.

This feature is due to the fact that each spring is supported on a portion of the upper edge of each pad directly above its corresponding pin, making it much easier to install the springs than existing noise reduction springs. I have to.

In order to fix each spring 24, 26 axially to the housing 10, the free end of the arm 32 is bent radially towards the interior of the brake and inserted into the housing opening 1.
It has tongues 36 abutting the 4 axially spaced edges.

Also, since a device is provided for axially securing each pin 20, 22 to the associated spring 24 or 26, no additional components are required for axially securing the pins.

In this embodiment, the device consists of a reduced diameter section 38 formed in each pin 20.22 above the disc 12.

The length of each portion 38 is substantially equal to the axial length of the lower arm 28.30 of the corresponding spring 24,26, so that the arm 28.
, 30 fit within portion 38 to securely secure the pin in the axial direction.

Additionally, each spring 24, 26 consists of a stamped strip of metal bent to form a clip, and preferably the spring arms 28, 30 act as brakes when the pad lining wears to a predetermined thickness. It is configured to also act as an abutment for the support plate of the pad 16,18.

This feature prevents damage to the disk that could occur if the support plates of pads 16 and 18 were in direct contact with disk 12.

As mentioned above, mounting the springs 24 and 26 is extremely easy and is accomplished by simply clamping the springs onto the pins while keeping the mounting pins 20 and 22 in place and requires no special tools. .

This is because each spring acts as a clip supported by a portion 38 of each pin, and the end of each spring arm 32 is
Press the pads 16 and 18 toward the inside of the brake.

The invention is not limited to the embodiments described above, but also applies to brakes with wire springs or other elastic materials that act in a similar manner to the metal strips forming the springs of the embodiments described above. It is clear that it can be applied to

The invention also includes embodiments in which two springs are mounted on each pin and each spring acts on one pad, and embodiments in which the number of mounting pins guiding the pads is other than two. .

Further, without departing from the scope of the invention, the spring...prevents improper mounting of the spring, such as a circumferential extension cooperating with one of the axially spaced edges of the opening of the housing. It may be equipped with equipment to do so.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a disc brake embodying the present invention;
2 is a sectional view taken along line 2-2 in FIG. 1, FIG. 3 is a sectional view taken along line 3-3 in FIG. On the other hand, it is an enlarged perspective view showing a pin cooperating with a spring and a close portion of a nozzing and a pad. In the drawings, reference numeral 10 is a nozzle, 12 is a rotating disk, 14 is an opening, 16.18 is a brake friction pad, 20 and 22 are mounting pins, 24 and 26 are noise reduction springs,
28, 30, 32 are arms, 34 is an upper edge, 36 is a tongue,
38 indicates a reduced diameter portion.

Claims (1)

Claims: 1. Having a radial opening 14 for accommodating two brake pads 16.18 slidable relative to at least one mounting pin 20.22 supported on the housing.
The mounting 10 is combined with the mounting pin 20.22 and the pad 16.18 to attach the pad to the disk 12.
at least one noise reduction spring 24, 26 which urges radially inwardly, said spring 24, 26 having a central portion of substantially U-shaped cross-section and bounded by said spring. One U-shaped arm 28.30 is supported between the pads 16.18 on the radially inward portion of the pins 20, 22, and the other arm extends parallel to the axis of the pins from the convolution and supports the pins 20, 22 between the pads 16. Pad 16.18
an axial arm 32 supported on a radially outward edge 34 of one of the disks, the support point between the one arm and the radially inward disk portion of the pin and the shaft; The point of support of the direction arm and the edge portion of one of the pads in the disk radial direction is located substantially on a plane in the disk radial direction passing through the axis of the pin. disc brake. 2 The other arm of the spring 24.26 extends parallel to the pin axis opposite the axial arm from the convolution to the other disc radially outward edge 34 of the pad 16.18. another axial arm 32 supported on a section, the point of support of said other axial arm and a section of the other disc radially outward edge of said pad being located on said plane; Claim 1 characterized in that
Disc brakes as described in section. 3. Said springs 24, 26 are provided with two springs which cooperate respectively with opposite axially spaced edges of said radial opening 14 of said housing 10 to fix the spring axially relative to the housing. Disc brake according to claim 2, characterized in that it comprises a portion (36). 4. The disc brake according to claim 2 or 3, wherein the springs 24, 26 are made of thin metal plates. 5. Claim 4, characterized in that each of the two parts fixing the spring axially to the housing consists of a tongue 36 bent radially inwardly into the disc. Disc brakes as listed. 6. The housing 10 is provided with a brake application device for pressing the pad 16, 18 toward the disk 12 on each of the disks, and is supported by the portion of the pin radially inward of the disk 12. arm 28.30
The disc brake according to claim 4 or 5, characterized in that the linings combined with each of the pads (16, 18) come into contact with the pads when the linings are worn down to a predetermined thickness. I The one arm 28, 30 supported by the inner portion of the pin in the disk radial direction
．． 22, the pin is fixed in the axial direction with respect to the spring. Disc brakes as listed. 8 The pad 16.18 has two mounting pins 20.
22, and the noise reduction springs 24, 26
8. The disc brake according to claim 1, wherein the disc brake is combined with each of the pins.