JPS5925895B2 - disc brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disc brake for an automobile.

The invention particularly provides a housing having a radial opening for accommodating two brake pads slidable over at least one mounting pin supported by the housing and inserted between the mounting pin and the pad. at least one 1
The present invention relates to a type of disc brake that includes a noise reduction spring.

In the known disc brake of this type, when there is only one mounting pin, the spring is formed in an H-shape, its four arms resting on the radially outward edge of the pad, and the central part is engaged with a reduced diameter portion provided on the portion of the pin directly above the disk, fixing the pin in the axial direction.

In addition, when there are two mounting pins, the spring is formed in a cross shape, two arms of which are supported on the outer edge of the pad in the disk radial direction, and the other two arms are directly above the disk. The pins are respectively engaged with reduced diameter portions provided on the two pin portions, thereby fixing the pins in the axial direction.

In this type of brake, it is necessary to install the spring into the brake at the same time as the pin is installed into the brake, which makes it difficult to install the spring and pin.

It has also been found that when this type of brake is subjected to vibrations and particularly severe operating conditions, the pins will crack at the reduced diameter section, and in certain extreme conditions at least one pin will break.

In order to overcome the above-mentioned drawbacks, the present invention provides that the mounting pin is located substantially on a radial plane of the disk passing through the axis of the mounting pin, and that the central cross-section thereof is substantially U-shaped; One arm of the U-shape is supported between the pads on a portion of the mounting pin radially inward of the disk, and the other arm extends axially on each side of the U-shape to support the disk radius of each pad. two axial arms supported on axially outward edges, each axial arm abutting an axially spaced edge of the aperture to hold the spring against the housing; an axially securing disk having a radially inwardly extending tongue for engaging the mounting pin to prevent escape of the pin in a first direction axially relative to the housing; a first means on the axial arm and a second means for engaging the mounting pin to prevent escape of the pin in an axially opposite direction relative to the housing; The present invention proposes a disc brake of the above type, characterized in that a disc brake is provided on either one of the axial arm and the housing.

It will be appreciated that with this configuration, the spring can be installed after the pad mounting pin is installed in the housing, making the process of installing the spring and pin easier, and the risk of pin breakage being considerably reduced.

A number of embodiments of the invention will now be described in detail with reference to the accompanying drawings.

1-3, the disc brake includes a housing 10 that is secured to a fixed element, such as a short axle (not shown) of a vehicle.

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

The pad is supported on the axial edge of the aperture 14 and
It is mounted on two mounting pins 20 and 22 which are received in holes in the axially spaced edges of.

Brake application devices (not shown), such as one or more pistons fitted into corresponding cylinders formed in housing 10 on each side of disc 12, move friction pads 16 and 18 of disc 12. Press on the corresponding friction surface to apply the brake.

Noise reduction springs 24 and 26 are attached to 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, the spring being
The bottoms of the shapes are placed back to back.

As shown in FIG. 2, the lower (radially inward disk) arm 28.30 of the U-shape bounded by each spring 24.26 is folded back to the corresponding pin 20 or 22.
It is supported at the lower part of the disk (inward in the radial direction of the disk).

The upper (disc radially outward) arms of the U-shape extend axially on either side of the U-shape to form two arms 32 on each spring 2426.

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-shape of each spring 24.26.

The free ends of the arms 32 are therefore supported on the upper (disk radially outward) edge 34 of each pad 16.18.

Each spring 24 , 26 is axially fixed to the housing 10 by a tongue 36 that is bent radially from the arm 32 into the interior of the brake and abuts the circumferential edge of the opening 14 .

In the embodiment shown in FIGS. 1 to 4,
Springs 24 and 26 are asymmetrical, with one of the tongues 36 being formed by the bent end of one arm 32 and the other tongue 36 being punched out from the extension 38 of the corresponding arm 32, as shown in FIG. It is the folded part as best shown in .

Preferably, the extensions 38 of both springs 24 and 26 are on the same side of the disk 12.

The end 40 of each extension 38 is bent radially into the brake along the housing to prevent the associated mounting pin 20 or 22 from axially escaping to the left in FIGS. To prevent.

Thus, the end 40 of each spring extension 38 is located proximate the adjacent end of the corresponding pin 20 or 22 and within the axial extension of the pin.

A shoulder 42 formed at the other end of each pin 20.22 includes a corresponding shoulder formed in a hole provided in the housing at the circumferential edge of the opening 14 remote from each spring portion 38; Due to the abutment, the pins 20 and 22 are prevented from escaping in axially opposite directions.

In this way, springs 24 and 26 securely secure pins 20 and 22 axially, obviating the need for the locking pins or studs that normally perform this function.

Therefore, the pin can be fixed axially without reducing the diameter of the central part of the pin, which is the part most susceptible to failure, which would lead to undesirable consequences such as even breakage of the pin.

Brake pad 1 shown in Figures 1 to 3
Attachment and removal of 6 and 18 is accomplished by first attaching the pad via the mounting pin by abutting the shoulder 42 of the mounting pin against a corresponding shoulder or abutment in the housing.

Thereafter, the spring parts or arms 28 and 30 are connected to the corresponding pins 2
By sandwiching the springs 24 and 26 at the bottom of 0 and 22,
is easily installed.

The bent end 40 of each spring extension 38 is moved into the axial extension of the mating mounting pin in close proximity to it;
The mounting of each spring simultaneously fixes each pin in the axial direction.

In the embodiment shown in FIG. 5, both the spring 124 and the pin 120 are symmetrical, so that the two
There is no need to use two different springs for one pin.

Similar to the previous embodiment, the central portion of spring 124 is substantially U
The U-shaped lower portion or arm 128 is adapted to engage the underside of the corresponding pin 120.

The upper portion or arm of the U-shape is extended along pin 120 on each side of the U-shape by an arm 132 similar to arm 32 of the previous embodiment.

Each arm 132 has an axial extension 138 whose bent end 140 prevents axial movement of the pin 120 in either direction.

As with the folded end 40 of the previous embodiment, this feature allows the end 140 to be folded radially into the interior of the brake.
This is achieved by having the ends 140 proximate to and within the axial extension of each end of the pin 120.

Tabs or tongues 136 are punched out of each extension 138 and folded radially into the interior of the brake so that
The tongue abuts a cooperating circumferential edge (not shown) of the radial opening of the brake.

This spring 124 is therefore axially fixed to the housing by the tongue 136 and the pin 120 is
24 is fixed axially by a bent end 140.

In the embodiment shown in FIG. 6, the device for axially securing pin 220 is different from the device used in both previous embodiments.

As previously mentioned, the central portion of the spring 224 has a substantially U-shaped cross-section, and the lower portion or arm 228 of the U-shape includes the pin 220.
engage around the bottom edge of the.

The upper part or arm of the U-shape is the arm 32 and 13 of both the above embodiments.
2, extending substantially parallel to pin 220 on each side of the U-shape.

The ends of the arm 232 are bent radially into the brake to form a tongue 244 that cooperates with a circumferential edge (not shown) of a radial opening in the brake housing to retain the spring. 224 is fixed to the housing.

Each tongue 244 also has a corresponding groove 246 in the pin 220.
It extends so that it can be inserted inside.

Therefore, the spring 224 can fix the pin 220 in the axial direction without weakening the strength of the central portion of the pin.

Additionally, because spring 224 and pin 220 are symmetrical, the same spring and pin can be used when the pad is mounted on two pins.

In the embodiment shown in FIG. 7, the device for axially securing pin 320 to spring 324 is similar to that used in the embodiment shown in FIG. Both the spring and pin are asymmetric.

The central portion of the spring 324 is substantially U-shaped in cross-section, and the lower portion or arm 328 of the U-shape engages the underside of the pin 320.

The upper portion or arm of the U-shape is extended parallel to pin 320 on either side of the U-shape by arms 332 .

The free end of one arm 332 is bent radially toward the interior of the brake to form a tongue 344 whose end engages within a groove 346 in pin 320.

The free end of the other arm 332 is also bent radially into the interior of the brake to form a tongue 336, the end of which cannot be inserted into the pin 320.

The tongues 336 and 344 cooperate with axially spaced edges of a radial opening in the brake housing to hold the spring 32.
4 is axially fixed to the housing.

Although the embodiments shown by way of example all relate to springs in the form of metal strips, the invention is not limited to springs in this form, but can also be applied to wire springs or other elastic materials. I can understand.

Similarly, the number of pad mounting pins may be other than two.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a disc brake embodying the principles of the present invention, FIG. 2 is a sectional view taken along line 2--2 in FIG. 1, and FIG.
The figure is a sectional view taken along line 3--3 in Figure 1, and Figure 4 shows an assembly with a mounting pin that is combined with one of the springs used in the disc brake shown in Figures 1 to 3. FIG. 5 is an enlarged perspective view of another embodiment of the assembly shown in FIG. 4; FIG. 6 is an enlarged perspective view of another embodiment of the assembly with a pin associated with a spring; Figure and 5th
FIG. 7 is an enlarged perspective view of yet another embodiment of an assembly with a mounting pin in combination with a spring; FIG. In the drawings, 10 is a housing, 12 is a disk, 14 is a radial opening, 16.18 is a brake friction pad, 20, 22, 120, 220° 320 is a mounting pin, 24, 26, 124, 224° 324 is noise reduction splash, 2B, 30, 32, 128° 132.228.232
．． 328.332 is the arm, 34 is the upper edge, 36,136
, 244, 336° 344 is a tongue portion, 38, 138 is an extension portion, 40, 140 is an end portion, and 246, 346 is a groove.

Claims (1)

[Claims] 1. 2 which is slidable on at least one mounting pin 20, 22; 120; 220; 320 supported by the housing.
a housing 10 having a radial opening 14 for accommodating brake pads 16, 18; and at least one noise reduction spring 24, 26; 124; 224; 324 inserted between said mounting pin and said pad. In the brake including the springs 24, 26; 124;
224; 324 is located substantially on a plane in the disk radial direction passing through the axis of the mounting pin, and has a substantially U-shaped central section, and one arm 2B, 30 of the U-shape; ;128;228;32B is the pad 16
, 18 between the mounting pins 20, 22; 120; 22
0; 320, with the other arm extending axially on each side of the U-shape and supporting the radially outer edge 34 of each pad 16, 18; two axial arms 32; 132;
232; 332, each of said axial arms extending radially inwardly of a disk abutting axially spaced edges of said aperture 14 to axially secure said spring to said housing; tongue portion 36; 136; 244; 33
6; 344, and further includes the mounting pins 20, 22; 1
20; 220; 320 to prevent the pin from axially escaping with respect to the housing in a first direction; A second means for engaging the rack pin and preventing the pin from escaping in an axially opposite direction with respect to the housing is provided on one of the axial arm and the housing. and disc brakes. 2. A portion 140 in which each of the axial arms 132 of the spring is disposed adjacent to and within an axial extension of the mounting pin 120, forming the first and second means;
A disc brake according to claim 1, characterized in that it has: 3. One of the axial arms 32 of the spring has a portion 40 located close to and in the axial extension of one end of the mounting pin 20.22 and forming the first means. Claim 1, wherein said second means comprises an abutment portion formed on said housing that abuts a shoulder portion 42 formed on the other end of said pin 2022. disc brake. 4 a tongue 24 formed on the axial arm 232 of the spring;
4 protrude into grooves 246 formed in the pin 220 between the surfaces of the bands facing away from the disk and the corresponding ends of the mounting pin, respectively, and serve as the first and second means. A disc brake according to claim 1, characterized in that: 5. A tongue 344 formed on one of the axial arms 332 of the spring connects the pin 320 between the side of the pad facing away from one disk and the corresponding end of the mounting pin.
Claim 1, characterized in that the device protrudes into a groove 346 formed in the groove 346 and constitutes the first and second means.
Disc brakes as described in section. 6 Above spring 24.26; 124; 224; 324
The disc brake according to any one of claims 1 to 5, wherein the disc brake is made of a thin metal plate. 7 said housing 10 is fixedly supported on each side of a brake application device pressing said pad 16.18 towards said disc 12 and said pins 20, 22; 120; 22;
0 ; 320; said springs 24, 26; 124; 224;
128; 228; 328 acts as an abutment for each said pad when the lining of said pad has worn to a predetermined thickness. Disc brakes as described in section. 8 The mounting pin 20.2 with two pads 1618
2; 120; 220; 320; the two noise reduction springs 24, 26; 124;
224; 324 is the pin 20, 22; 120; 2
20; 320. The disc brake according to any one of claims 1 to 7, characterized in that it is combined with each of the following.