JP2571392B2 - Friction pad for brake - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction pad for a brake suitably used for, for example, a disc brake for an automobile, and particularly, an alarm is issued when the lining is worn to a wear limit. The present invention relates to a friction pad for a brake having a wear alarm piece provided on a back metal.

(Prior art)

8 to 13 show a conventional friction pad for a brake.

In the figure, reference numeral 1 denotes a friction pad, 2 denotes a back metal of the friction pad 1, and a pair of ears 2 is provided on both left and right ends of the back metal 2.
A and 2A are protruded, and each ear 2A is slidably supported by a disc brake carrier (not shown) or the like. Also, circular punched holes 2B, 2B and the like are formed in the back metal 2, and each of the punched holes 2B is used to position a lining 5 described later on one side surface (the back surface side in FIG. 8) of the back metal 2. Has become.

Reference numeral 3 denotes a circular recess formed on one side surface of the back metal 3, which is located on the lower left side of the back metal 2. The recess 3 is press-formed using a punch 8 described later as shown in FIG. Thus, a protrusion 4 for swaging is formed on the other side surface of the back metal 2. Here, the concave portion 3 is
As shown in the figure, is formed with a diameter of diameter d _1, the outer diameter of the projection 4 has a smaller diameter diameter d ₂ than the diameter d _1.

Reference numeral 5 denotes a lining integrally provided on one side of the back metal 2, and the lining 5 is provided on one side of the back metal 2 by means of integral molding of a resin material based on sintered metal, asbestos or the like. The resin material is formed by pressure molding. At this time, the resin material is also filled in the punched holes 2B and the recesses 3 of the back metal 2. The lining 5 is pressed by a rotating disk (not shown) at the time of a brake operation, and frictionally engages with the surface of the disk to apply a braking action to the disk.

Reference numeral 6 denotes a wear alarm piece for alarming when the lining 5 has reached the wear limit due to wear, and the wear alarm piece 6 is formed by press-forming a long plate material such as a steel plate having spring properties. The base end 6A is fixed to the projection 4 of the back metal 2 by swaging as described later. And the tip side of the wear alarm piece 6
6B protrudes from one side surface of the backing metal 2 by a predetermined dimension in the thickness direction of the lining 5, and when the lining 5 has worn down to the wear limit, the disk surface comes into contact with the disk surface to generate a loud wear noise. A warning is given to a driver or the like that the vehicle should be replaced with a new one.

Next, a method of manufacturing the friction pad 1 configured as described above will be described with reference to FIGS.

First, each ear 2A, each punched hole 2B, etc. are formed in the back metal 2, and the other side surface of the back metal 2 is brought into contact with the die 7 as illustrated in FIG. The punch 8 is driven in the direction of arrow A by a press or the like at a position coaxial with the punch. The tenth
In the drawing, for convenience of explanation, the positions of the die 7 and the punch 8 are shown in an inverted state. Then, by punching the punch 8, a diameter d ₁ corresponding to the outer diameter of the punch 8 is formed on one side surface of the back metal 2.
To form the recess 3, to form a projection 4 having a diameter d ₂ which corresponds to the hole diameter of the die hole 7A in the other side. In this case, since the protrusion 4 and the recess 3 are formed by plastic deformation of the back metal 2, the volumes of both are substantially equal.

Next, the lining 5 is integrally formed on one side surface of the backing metal 2 by means of pressure molding or the like, and the base end 6A of the wear alarm piece 6 is attached to the projection 4 as shown in FIG. 13C, and in this state, the protrusion 4 is pressed and deformed in the direction of arrow B using a punch 9 or the like, and as shown in FIG. The back metal 2 is fixed to the other side by caulking.

[Problems to be solved by the invention]

However, in the prior art described above, the diameter d ₁ of the concave portion 3 formed on one side of the backing metal 2 as shown in FIG. 10, since a larger diameter than the diameter d ₂ of the projection 4 formed on the other side When the protrusion 4 is swaged, the center of the bottom of the recess 3 becomes a recess 3A as shown in FIG. 13 and falls into the recess 3, thereby not only reducing the volume of the protrusion 4 but also reducing the volume of the protrusion 4. Also, there is a disadvantage that it is difficult to securely fix the base end 6A of the wear alarming piece 6 to the other side surface of the backing metal 2 because the diameter expansion amount becomes small. In particular, since the back metal 2 is subjected to a nitriding treatment or the like for rust prevention measures or the like, the back metal 2 becomes brittle and easily deforms plastically.
The volume of the depression 3A etc. increases, the volume of the projection 4 decreases,
These disadvantages are increasingly exacerbated.

If the volume of the depression 3A is increased, the material of the lining 5 filled in the recess 3 is extruded from the recess 3 and the adhesion of the lining 5 to the backing metal 2 is deteriorated. There is a disadvantage that the fixing force is impaired.

On the other hand, Figure 14 and 15 in the other illustrated prior FIG art as, when smaller diameter than the diameter d ₂ of the diameter d ₃ of the concave portion 3 projecting portion 4, for a predetermined amount of ensuring the volume of the projecting portion 4 In addition, since it is necessary to increase the depth dimension of the concave portion 3, the thickness t between the concave portion 3 and the protrusion 4 is significantly reduced, and even if the wear alarm piece 6 can be caulked and fixed by the protrusion 4, However, there is a disadvantage that the shear strength and the like of the projection 4 are greatly reduced.

The present invention has been made in view of the above-described drawbacks of the related art, and the present invention can prevent the projection from being depressed toward the recess when the projection is swaged, and the projection can reliably prevent the wear alarm piece. An object of the present invention is to provide a friction pad for a brake so that it can be fixed by caulking and can prevent the strength of the projection from being reduced.

[Means for solving the problem]

The feature of the configuration adopted by the present invention to solve the above-mentioned problem is that the concave portion of the back metal has a hole diameter partly larger than the outer diameter of the protrusion, and the inner peripheral side of the concave portion has The reason is that a reinforcing meat portion protruding inward from the outer diameter of the protrusion is formed.

[Action]

Reinforcement flesh that protrudes inward from the outer diameter of the protrusion is formed on the inner peripheral side of the recess, so that when the protrusion is caulked, the protrusion is sunk into the recess. The meat portion can be supported and prevented from below.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 7. In the embodiment, the same reference numerals are given to the same components as those in the prior art shown in FIGS.
The description is omitted.

FIGS. 1 to 3 show a first embodiment of the present invention.

In the figure, reference numeral 11 denotes a back metal, and the back metal 11 is formed substantially in the same manner as the back metal 2 described in the prior art. Reference numeral 12 denotes a concave portion formed on one side surface of the back metal 11, and the concave portion 12 is formed by driving a punch (not shown) with a press or the like in substantially the same manner as the concave portion 3 described in the related art. , projection 13 for caulking with other aspects as well the outer diameter of the diameter d ₂ and projection 4 described in the prior art to the back metal 11 are projectingly formed on a circular. The volume of the projection 13 is substantially equal to the volume of the recess 12, and the punch is formed in a shape corresponding to the recess 12.

Here, as shown by the two-dot chain line in FIG.
Large diameter portion 12A is recessed in an arc shape along an imaginary circle 14 of the larger diameter d ₄ than the diameter d ₂ of the projection 13, 12A, ... and located between the respective large-diameter portion 12A, protrusions Diameter d ₅ smaller than diameter d _{2 of} 13
Arc-shaped projections 12B, 12B, as small-diameter portions protruding in a semicircular shape inward in the radial direction so that the tip side is in contact with the virtual circle 14 of
Each of the arc-shaped projections 12B extends in the depth direction of the concave portion 12 at a predetermined interval between the large-diameter portions 12A. Each of the arc-shaped projections 12B constitutes a reinforcing meat portion for receiving an external force acting on the projection 13 in the direction of arrow B on the lower side when the projection 13 is swaged as shown in FIG. However, the depression 3A and the like described in the related art are prevented from being formed on the bottom side of the concave portion 12.

The brake friction pad according to the present embodiment has the above-described configuration, and there is no particular difference in the manufacturing method, basic operation, and the like from those according to the prior art.

However in this embodiment, the recess 12 formed by using a punch or the like back metal 11, and the large-diameter portion 12A as a diameter larger than the diameter d ₂ of the projection 13, radially from between the respective large-diameter portion 12A projecting semicircular inwardly, because the tip is composed of the respective arcuate projections 12B as small diameter portion in contact with the small-diameter imaginary circle 15 than the diameter d ₂ of the projection 13, collision as shown in FIG. 3 When the portion 13 is pressed and caulked in the direction of arrow B, each of the arc-shaped protrusions 12B
Serves as a reinforcing meat portion, and can reliably prevent the protrusion 13 from sinking into the concave portion 12 as in the prior art, increasing the diameter of the protrusion 13 and increasing the wear alarm piece 6 The proximal end 6A can be firmly caulked and fixed.

Further, since each large diameter portion 12A of the concave portion 12 is formed along an imaginary circle 14 of diameter diameter d ₄ than the diameter d ₂ of the projection 13,
Without increasing the depth of the recess 12, the volume of the recess 12 can be increased, the thickness t ₁ between the recess 12 and the projection 13 is increased as shown in FIG. 1 Thus, the step strength and the like of the projection 13 can be reliably increased. In addition, back money
When the lining 5 is pressure-formed on one side surface of the eleventh portion 11, the material of the lining 5 is filled in the recess 12 between the arc-shaped projections 12 B and the like. Various effects are exhibited, such as improvement in the adhesion (adhesion) between the back metal 11 and the lining 5 and the firm fixation of the two.

Next, FIG. 4 shows a second embodiment of the present invention. The feature of this embodiment is that the concave portion 21 is in contact with an imaginary circle 23 having a larger diameter than the protruding portion 22. 21A,... And the respective large diameter portions 21A
Triangularly project radially inward from the space between the two
. Are formed as small-diameter portions in contact with the virtual circle 24 having a smaller diameter than that of the virtual circles 24, and the reinforcing projections are formed by the respective square-shaped projections 21B. Note that each of the angular projections 21B does not necessarily have to be triangular, and may project in a square shape, for example.

Thus, also in the present embodiment having the above-described configuration, it is possible to obtain substantially the same operation and effect as in the first embodiment.

Next, FIG. 5 shows a third embodiment of the present invention. The feature of this embodiment is that a concave portion 31 is formed in a substantially cross shape, and an arcuate shape in contact with an imaginary circle 33 having a diameter larger than that of the projection 32. Large diameter parts 31A, 31A, ...
And arc-shaped projections 31B, 31B,... As small-diameter portions that protrude radially inward from each large-diameter portion 31A in an arc shape and whose tip is in contact with an imaginary circle 34 smaller in diameter than the projection 32. It is in.

Thus, also in the present embodiment configured as described above, each arc-shaped projection 31B serves as a reinforcing meat portion, and substantially the same operation and effect as in the first embodiment can be obtained.

Next, FIG. 6 shows a fourth embodiment of the present invention. The feature of this embodiment is that the concave portion 41 is formed in an elliptical shape or an elliptical shape, and its long axis side has a larger diameter than the projection 42. The large-diameter portions 41A and 41A are in contact with the virtual circle 43, and the short-axis sides thereof are the small-diameter portions 41B and 41B that are in contact with the virtual circle 44 smaller than the projection 42.

Thus, in the present embodiment configured as described above, each small-diameter portion 41B serves as a reinforcing meat portion, so that substantially the same operation and effect as those of the above-described embodiments can be obtained. Since the oval 41 is formed in an oval or elliptical shape, the shape of the recess 41 can be simplified, and the life of the punch or the like can be improved.

Next, FIG. 7 shows a fifth embodiment of the present invention. This embodiment is characterized in that a pair of concave portions 51 are opposed to each other and have a substantially semicircular shape with an arc larger in diameter than the projection 52. Holes with bottom 51A, 51A
And extends linearly between the respective bottomed holes 51A so as to divide the respective bottomed holes 51A into two, and the left, right ends and lower end thereof are integrally formed on the inner peripheral surface and the bottom surface of the concave portion 51. A diametrical connecting rib 51B as a connected reinforcing meat portion is provided. Here, the sum of the volumes of the bottomed holes 51A is the protrusion 5
This corresponds to the volume of 2, and by forming each bottomed hole 51A with a diameter larger than the outer diameter of the projection 52, the depth dimension of each bottomed hole 51A can be reduced.

Thus, in this embodiment configured as described above, it is possible to obtain substantially the same operation and effect as those of the above embodiments.
In particular, in this embodiment, since the connection rib 51B is formed so as to divide each bottomed hole 51A into two, the depression or the like when the projection 52 is swaged can be more effectively prevented by the connection rib 51B. The connecting rib 51B does not necessarily need to be formed over the entire length in the depth direction of the concave portion 51, and may protrude from the bottom surface of the concave portion 51 by a predetermined length.

〔The invention's effect〕

As described in detail above, according to the present invention, the hole diameter of the concave portion formed on one side of the back metal is made partially larger than the outer diameter of the protrusion on the other side, and the protrusion is formed on the inner peripheral side of the concave portion. Since the reinforcing meat portion projecting more inward than the outer diameter of the projection is formed, when the projection is swaged, the projection can be prevented from sinking into the concave side,
By increasing the diameter of the projection, the wear alarm piece can be firmly fixed by caulking. Further, it is not necessary to increase the depth dimension of the concave portion, the thickness between the concave portion and the projection can be increased, and the shear strength of the projection can be increased.

[Brief description of the drawings]

1 to 3 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a main part of a backing metal taken along a line II in FIG. 2, and FIG. FIG. 3 is a longitudinal sectional view of a main part of a friction pad showing a state where a wear warning piece is swaged, FIG. 4 is a plan view showing a shape of a concave portion according to the second embodiment, and FIG. FIG. 6 is a plan view similar to FIG. 4 showing the fourth embodiment, FIG. 6 is a plan view similar to FIG. 4 showing the fourth embodiment, and FIG.
Plan view similar to FIG. 4 showing the embodiment of FIG.
FIG. 13 shows the prior art, FIG. 8 is a rear view of the friction pad,
9 is a cross-sectional view in the direction of arrows IX-IX in FIG. 8, FIG. 10 is a vertical cross-sectional view of a main part showing a state in which a recess and a protrusion are formed on the back metal,
11 is a bottom view of the back metal shown in FIG. 10, FIG. 12 is a longitudinal sectional view of a main part of the friction pad showing a state where the wear alarm piece is caulked to the back metal, and FIG. FIG. 14 and FIG. 15 are longitudinal sectional views similar to FIG.
The figure is a longitudinal sectional view of a main part showing a state in which a concave portion and a protruding portion are formed on the back metal, and FIG. 15 is a bottom view of FIG. 5 ... lining, 6 ... wear warning piece, 11 ... back metal, 1
2,21,31,41,51… recess, 12A, 21A, 31A, 41A large diameter portion, 12B, 31B arc-shaped projection, 13, 22, 32, 42, 52 projection, 14 , 15, 23, 24, 33, 34, 43, 44: virtual circle, 21B: angular projection, 41B: small diameter portion, 51A: bottomed hole, 51B: connecting rib.

Claims (3)

(57) [Claims] 1. A wear alarm for a lining in a state in which a concave portion is formed on one side surface of a back metal to form a protrusion for caulking on the other side surface of the back metal and the lining is fixed to one side surface of the back metal. In a friction pad for a brake formed by caulking a piece to the projection, the recess of the back metal has a hole diameter partially larger than an outer diameter of the projection, and an inner peripheral side of the recess is A friction pad for a brake, wherein a reinforcing meat portion protruding inward from an outer diameter of the projection is formed. 2. The concave portion includes a large-diameter portion larger than the outer diameter of the projection and a small-diameter portion smaller than the outer diameter of the projection, and the small-diameter portion forms the reinforcing meat portion. A friction pad for a brake according to claim 1. 3. The patent wherein the recess is formed of a pair of bottomed holes having a diameter larger than the outer diameter of the projection and having a substantially semicircular shape, and the reinforcing meat portion is formed between each of the bottomed holes. The friction pad for a brake according to claim (1).