JPS5977137A - Friction pad - Google Patents

Abstract

PURPOSE:To prevent deflecting abrasion of a friction pad to lengthen the life of the friction pad and to prevent generation of noise by forming a friction pad divided into two parts with two kinds of friction materials different in abrasion factor. CONSTITUTION:A friction material is divided into the front and rear portions relative to the sliding direction of its friction surface. One of the front and rear portions is formed of a friction material having an abrasion factor of 2- 4X10<-4>mm.<3>/kg.m under test conditions where inertia is 2.5 kgms<2> based upon JASOC406, braking initial speed 50km/hr, braking deceleration speed 0.3g, pre- braking temperature 200 deg.C, and the number of times of braking 5,000 times, and the other of the portions is formed of another kind of friction material having a different abrasion factor. Various methods can be adopted for varying an abrasion factor. The most general method is to differentiate mixing ratios of a bonding agent that is one of principal components forming a friction material. An abrasion factor can be changed by varying the kind of a bonding agent or a friction modifying agent.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a friction pad used in a disc brake. A disc brake is a rotating disc that is sandwiched between two 1 ml friction pads on both sides, and provides braking force by the frictional force between the rotating disc and the two friction pads. In the conventional disc brake device A3, the amount of wear of the friction pads differs in parts, and there is a tendency for part 1 to wear more than other parts.

This unevenness in the amount of wear often occurs in the sliding direction of the friction surface, with unevenness between the front and rear parts in the sliding direction. This bias tends to be more or less constant for the same general G1 disc brake equipment, and in many disc brake equipment currently in use, I! ! It has been revealed that when facing the friction surface -C1 and making the sliding direction coincide with the left-right direction, a greater amount of wear occurs in the left direction of the friction surface than in the right direction. This bias in thickness leads to disadvantages such as shortening the life of the friction pad and causing noise.

It is an object of the present invention to provide a friction pad that is free from such deviation due to wear.

The friction pad of the present invention has +3 on the friction pad made of a back plate 1, which is made of silica compounded on one side of the back plate, and the friction material is on the front part J3 in the sliding direction of the friction surface.
It is divided into two parts, the front part and the rear part, and one of the front part and the rear part has an inertia p 2 , 5 kgms? according to JASOC406 with respect to the other. , braking initial speed 50km/1-
lr, braking deceleration 0.3g, brake temperature before braking 200
'2 to 4 x under test conditions of 5000 C1 braking cycles
It is characterized by being composed of two types of friction materials with different wear rates of 10-4 mm3/kg-m.

In the friction pad of the present invention, back play 1~ refers to a metal plate that receives the hydraulic pressure of the brake device.

A friction material is bonded and held to one surface of this back plate.

The friction material of the friction pad of the present invention is divided into two parts, a front part and a rear part in the sliding direction of the friction surface. Therefore, different friction materials 11 are arranged in the front and rear parts, and as a result, in the front and rear parts, inertia t 2 and 5 k (+11132, initial braking speed m
50 km/I-1r, braking deceleration 0.3o,
The brake temperature before braking is 200℃, the number of braking is 5000 times, the thick friction strip A'1 is +3, and the wear rate of one side is 2 to 4X 10-4 mm3, 'kg, m, and the wear rate is different from the other. ing. Depending on the wear rate, the difference in wear due to Iζ is adjusted mechanically on either the front or the rear, and the friction material wears more or less uniformly as a whole. In addition, there are two types of friction that make up the front and rear parts.
1 and 83, various methods can be employed to vary the above-mentioned wear rates. The most common method is to vary the blending ratio of a binder, which is one of the main components constituting the friction material.

For example, assume that the blending amount of the binder in one friction material is 12%, and the blending amount of the binder in the other friction material is 10%. In other words, a friction material with a 10% lower binder content has a higher wear rate than a friction material with a 12% lower binder blend. In addition to changing the IJ ratio of the binder, it is also possible to change the type of binder, such as using a binder with a low wear rate and a binder with a relatively high wear rate. Similarly, the wear rate can be changed by changing the type of base material. Also, 1′! J It is possible to avoid changing the wear rate by avoiding changing the type of friction modifier C.
'Wear.

The main components of the friction IQ +4 material used in the thick J\3 pad of the present invention are as described above in that they change the wear rate (13). Generally speaking, relatively heat-resistant fibers such as Ashes 1~, glass fibers 1, metal fibers, cellulose fibers, etc. can be used as the base material of the friction material. In addition, as a binder, a heat-resistant thermosetting resin mainly composed of phenolic resin can be used.For J-nor resin, cashew oak 1~modified with oil, epoxy resin, or other resin, Modified phenolic resins can be used for various purposes.As friction modifiers,
Cashudas 1~, Rubberdas 1, Graphai 1~,
Metal powder, fiJtlFf barium, Macnesia powder, alumina powder, etc. can be used. Also, N +
3 It is also possible to blend rubber components such as R15DR.

The friction material of the friction pad of the present invention may be formed by separately molding the front and rear parts, and applying the individual friction materials to the back play 1.Also, the front and rear parts may be individually molded. The constituent friction materials are adjusted individually, and in the friction material molding process, the friction material is placed separately in the front and rear parts in the same mold, and molded simultaneously to form one friction material. You can also do that.

In addition, the front and rear parts of the friction material do not necessarily have to be set at a ratio of 50% and 50%, but one may be set at a ratio of 30% depending on the usage conditions.
It is also possible to set the % curve to 70% and avoid changing the ratio. Further, the boundary between the front part and the rear part does not necessarily have to be linearly distinct, but may have a shape in which the friction materials forming the front part and the rear part gradually intersect.

This friction pad is divided into two halves in the sliding direction of the friction surface, and one of the front and rear parts has a different wear rate than the other. In addition, uneven wear of the MiEff itself in the disc brake device can be suppressed. In other words, mechanically F? For example, in a disc brake device with a friction pad that has a large amount of wear and uneven wear in the left direction toward the friction surface, the wear rate is small in the h direction toward the friction surface. By using the FF[! pad of the present invention using the first observation material, in actual use, the friction pad generates almost uniform friction on both the front and rear of the friction surface.

This prevents uneven wear of the friction pad 1- and extends the use of the friction pad Xj'@. Further, it is possible to prevent the occurrence of noise, abnormal sounds, etc. caused by uneven wear.

Next, let's take a look at the examples.

A perspective view of the friction pad of this example is shown in the figure. This friction pad consists of an iron back plate 1 with a thickness of 5 nv, and a g-friction material 2 with a thickness of 10 mm formed integrally with two types of friction materials on the upper surface thereof.

This friction material 2 is made by integrally molding the left half and the right half (facing the friction surface) with different friction materials fi+, respectively. (Referred to as the rear part 22), friction materials having different wear rates are arranged to serve as friction materials. Front part 21 friction F
M monthly yield (asbestos 38%, J-nor resin 13mm%, black fi) 11% by weight, copper powder 1/1% by weight, other friction modifiers (barium sulfate, slaked lime, aluminum, Consisting of 24% by weight of Kashi J-das 1- and Rubber Tas (~).
In the same way as the manufacturing method of q8 Rubber H, each of the above-mentioned raw stones was placed in a mixer and mixed thoroughly. On the other hand, rear 2
2, 1 year old (1 year old 81 years old, asbestos 1-38%, 7
1 Noichiru April fat 11% by weight, black 107 weight fff 9 (,
, 6 Toshi powder 11 weight i1%, other friction adjusting materials (front 2
The same friction modifier as No. 1, >31.5 mm%, and alumina powder, 1.5 mm%, were thoroughly mixed in a mixer in the same way to adjust the friction (i.e., these two types of F!71?7I).
The same amount of monthly charge was filled into the front and rear parts of the preliminary drawing mold, and compressed with a pressure of 400 kg/cm 2 to obtain a rough shaped material.

This phase material was heated and compression molded in a mold heated to 160°C. I made the shrine as far as jJjl. This friction material was inserted into a heating furnace at 180°C for 16 hours to perform post-curing, and then the surface of the friction material (σ1 polishing, back play 1
There is a difference between the friction material of this example and the bonding to -1.

In addition, the friction material made only from the friction material of the front part 21 of the material, and the friction material made only of the friction material 1 of the rear part 22)hL/
The PXX friction material was used for comparison. The friction material of this example and the 2-Si type friction material for comparison were tested using a passenger car brake device tynamometer test head with an inertia of 2.5.
Niri mS2, braking initial speed 5 Q km/b, braking deceleration 1! ffo, 3 (1. The wear rate was measured under the test conditions of 200 °C flakes before braking and 5000 braking cycles. Also, the hardness and porosity of the grooves were measured.) .

The hardness (1-I RC) of the friction material manufactured using only the friction 4AJ'41 of the front part 21 is 75 to 90, and the porosity is 3 to 7.
%, wear rate is 1.5~2.5x 10"-4mm3
/kgIll. Furthermore, the deviation due to wear between the front and rear parts of this friction material was 0.2 mm.

On the other hand, the hardness (+-I RC) of the friction material manufactured by -C only for the rear part 22 is 50 to 65, and the porosity is 10 to 20.
Volume B>%, wear rate 4.5~5.5x 10-4mm3/
It was l+gm. In addition, the deviation due to wear between the front and rear parts of this Iv shank was Q, 4n+m.

In contrast to the friction H of these comparative examples, Pf of the example of Kikomei
, the wear rate of the ring material is 2.8~3.3X10-4mm37k
gm, and the difference in the amount of wear between the front and rear parts is 0,
There was a difference of 1 to 0.2 mm.

[Brief explanation of drawings]

The figure is a perspective view of a mechanical bag l' according to an embodiment of the present invention. 1... Back plate 2... Friction material 21... Front friction material 22... Rear friction material

Claims (3)

[Claims] (1) In a friction pad consisting of a back plate and a friction material coupled to one surface of the back plate, the friction material is divided into two parts, a front part and a rear part in the direction of the friction surface, and the front part and the rear part. Either one is equivalent to JΔ5OC406 with respect to the other +□ 2, 5
k (JIIIS2, initial braking speed 50 kll/I-
1r, braking deceleration 0.3(], brake before braking jfi
2 to 2 under test conditions of 200°C, 5000 braking cycles
A friction pad characterized by being composed of two types of friction materials*31 with different wear rates of 4×10-4 mm3/kg・I. (2) The friction pad according to claim 1, wherein the front and rear parts of the friction material are integrally formed. (3) The friction material is a t-hard type that uses thermosetting resin as a binder, and the two parts forming the front part J5 and the rear part of the friction material
The friction pad according to claim 1, wherein one of the types of friction materials has a binder content that is 1 to 3 mFF196 higher than the other friction material.