JPH022102Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a semi-metallic friction braking body that can suppress squealing, especially at low speeds.

For example, brake bodies used in automobile brakes are made of friction materials whose main component is asbestos, but the friction materials that make up these brake bodies have problems with friction performance such as wear resistance under high temperatures. Therefore, braking bodies made of semi-metallic friction materials are often used depending on the field of use.

This semi-metallic friction material generally consists of steel fibers, a binder made of phenolic resin, graphite,
It consists of fillers such as iron powder and barium sulfate, and can be broadly classified according to the content of steel fiber, which is the main component, and semimetallic friction materials containing 20 to 45 volume percent of steel fiber and 5% of steel fiber. Although it can be classified as a semi-metallic friction material containing 15% to 15% by volume, there are drawbacks to the braking body obtained no matter which material is used.

In other words, a brake body made only of semi-metallic friction material produces less squeal at low speeds, but has poor mechanical strength.
Further, a braking body made only of semi-metallic friction material has good mechanical strength, but generates a loud squeal at low speeds, and cannot be said to be satisfactory in use.

The present invention was devised in view of the above-mentioned drawbacks of the prior art, with the aim of providing a brake body that produces less squeal at low speeds and has good mechanical strength. fiber,
In a braking body in which a semi-metallic friction material containing phenolic resin, rubber, etc. as a binder and graphite, barium sulfate, cashew dust, etc. as a filler is laminated and fixed, the semi-metallic friction material with a high content of steel fiber as a fiber component is used. A main braking part is formed, and a sub-braking part made of a semi-metallic friction material with a low content of steel fiber as a fiber component is formed perpendicular or substantially perpendicular to the braking direction of the braking body. It is.

Next, an example of implementation of the present invention will be explained with reference to the drawings.

Reference numeral 1 denotes a backing plate made of an appropriate metal material, and 2 a main braking part made of a semi-metallic friction material laminated and fixed on the backing plate 1. The main braking part 2 is made of steel fibers containing, for example, 20 to 45 volume percent of steel fibers. It is made of a material with a high content, and although its mechanical strength is comparable to that of asbestos-based friction materials, it does not cause damage between the braking body and the braked body, especially when the braking body is applied at low speeds. There is a drawback that the so-called squeal, which is the fricative sound produced, is large.

Reference numeral 3 denotes a sub-braking section made of a semi-metallic friction material which is adjacent to the main braking section 2 and is laminated and fixed to the back plate 1 with its longitudinal direction perpendicular to the braking direction S of the braking body. It is made of a material with a low steel fiber content, such as 5 to 15 volume percent steel fiber, and although it has the advantage of less squealing especially at low speeds, It has the disadvantage that its mechanical strength is inferior to those with high strength.

A braking body according to an example of the present invention is constituted by 1 to 3 above, and uses two types of semi-metallic friction materials with different steel fiber contents, and the main braking part 2 occupies most of the braking body. A material with a high steel fiber content and high mechanical strength is used for the braking part, and a material with a low steel fiber content and low noise is arranged adjacent to the above-mentioned part as a sub-braking part 3 whose longitudinal direction is orthogonal to the braking direction. This makes it possible to take advantage of the advantages of two types of semi-metallic friction materials with different steel fiber contents, and the mechanical strength is not much different from conventional products, and it sufficiently suppresses squealing, especially at low speeds. be able to.

Therefore, in the above embodiment, the sub-braking part 3 made of a semi-metallic friction material with a low content of steel fibers was disposed adjacent to one end of the main braking part 2 made of another semi-metallic friction material. is not limited to this configuration; in short, the sub-braking part 3 is made of a semi-metallic friction material with a low content of steel fibers.
may have at least a portion whose longitudinal direction is perpendicular to the braking direction S.

That is, as shown in FIGS. 2 to 5 showing other aspects of the braking body of the present invention, the sub-braking section 3 may be disposed adjacent to both ends of the main braking section 2 (FIG. 2), or the sub-braking section 3 may be disposed adjacent to both ends of the main braking section 2 (FIG. A sub-braking part 3 is disposed approximately in the center of the main braking part 2 of the braking body shown in the figure, with its longitudinal direction perpendicular to the braking direction (Fig. 3), or The sub-braking part 3 may also be arranged at the remaining end (Fig. 4), or the sub-braking part 3 may be arranged so as to surround the entire circumference of the main braking part 2 (Fig. 5). Like the brake body shown in Figure 1, both have the same mechanical strength as conventional products, but can suppress squeal at low speeds.

Since the present invention is as described above, it is extremely practical as a semi-metallic friction braking body used in the brakes of automobiles, etc.

[Brief explanation of the drawing]

Figure 1 shows an example of the braking body of the present invention.
1 is a perspective view, b is a plan view, and FIGS. 2 to 5 are plan views showing other examples of the brake body of the present invention. 1... Back metal, 2... Main braking part, 3... Sub-braking part.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A braking body in which a semi-metallic friction material containing steel fiber as a fiber component, phenol resin, rubber, etc. as a binder, and graphite, barium sulfate, cashew dust, etc. as a filler is integrally laminated and fixed as a backing metal. In this method, the main braking part is formed of a semi-metallic friction material with a high content of steel fibers as a fiber component, and the sub-braking part is made of a semi-metallic friction material with a low content of steel fibers as a fiber component. A semi-metallic friction brake body characterized by being formed perpendicularly or substantially perpendicularly to the braking direction. 2. The braking body according to claim 1, wherein the semi-metallic friction material contains 20 to 45 volume percent of steel fibers as a fiber component. 3. The braking body according to claim 1 or 2, wherein the semi-metallic friction material contains 5 to 15 volume percent of steel fibers as a fiber component. 4. The braking body according to any one of claims 1 to 3 of the utility model registration claim, in which the auxiliary braking part is formed adjacent to the end face of the main braking part. 5 Claims 1 to 4 for utility model registration in which the auxiliary brake part is arranged in the center or approximately in the center of the main brake part
Braking body for any of the items. 6. The braking body according to any one of claims 1 to 3 and 5 of the claims for utility model registration, in which the auxiliary braking part is arranged around the main braking part so as to surround it.