JP2000179596A - Disk brake pad - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk brake pad which is unnecessary for any special facilities or jigs, capable of solving problems that a pad clip is easy or difficult to detach, and capable of attaching/detaching the pad clip with a simple work. SOLUTION: In a disk brake pad provided with a long U-shaped base part formed of a strip-like elastic material, and a pad clip 1 in which one end of the long U-shaped base part 2 is of the length to be projected to the surface of the allowable wear thickness of a friction member 7, and the other end is folded at a right angle in the middle thereof and fixed to one side surface of a backing 4, an elastic projecting piece 3 is formed on a part folded at a right angle of the pad clip 1, a space 5 in which the part folded at a right angle of the pad clip 1 is attachable/detachable is provided on the backing 4, the pad clip 1 is inserted in the space 5 provided in the backing 4, and when the elastic projecting piece 3 reaches an opening part provided in a part of the space 5 in the backing 4, the pad clip 1 is fixed to the backing 4 so that a tip of the elastic projecting piece 3 is jumped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a disc brake pad.

[0002]

2. Description of the Related Art Disc brake pads are used for braking automobiles, railway vehicles, various industrial machines, and the like. Currently, in these disc brake pads, there is a disc brake pad provided with a wear limit alarm device called a pad clip.

As a disc brake pad provided with a wear limit alarm device, a pad clip fixed to a backing metal by a caulking method as shown in Japanese Utility Model Publication No. 57-57228 is disclosed in Japanese Utility Model Publication No. 59-81827. As shown, there is one in which a pad clip is fixed to a back metal by a sandwiching method.

However, in the method disclosed in Japanese Utility Model Publication No. 57-57228, when the pad clip is attached to the back metal, a crimping facility and a jig for fixing the pad clip are required. Further, according to the method disclosed in Japanese Utility Model Laid-Open Publication No. 59-81827, it is easy to attach a pad clip, but there is a problem that the pad clip is easily detached or hardly detached.

[0005]

DISCLOSURE OF THE INVENTION The present invention eliminates the problem that a pad clip is easily detached or hardly detached without requiring special equipment, jigs and the like, and detaches and attaches a pad clip by a simple operation. It is intended to provide a disc brake pad capable of performing the following.

[0006]

According to the present invention, a long U-shaped base and one end of the long U-shaped base are made of a strip-shaped elastic material, and protrude to a surface of a frictional member having an allowable thickness. The other end is bent at a right angle from the middle, and a pad clip is fixed to one side surface of the back metal at this bent part. On the other hand, the back metal is provided with a space where the part bent at a right angle to the pad clip can be attached and detached, and the pad clip is inserted into this space while pressing down the elastic protrusion, and the elastic protrusion is part of the space of the back metal A disc brake pad in which a pad clip is fixed to an opening of a back metal so that a tip of the elastic protruding piece rebounds when reaching an opening provided.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the material used for the pad clip is not particularly limited as long as it is made of a strip-shaped elastic material. For example, SUS301, SU
S304, It is preferable to use phosphor bronze. The pad clip has, for example, a long U-shaped portion as a base, one end of the base having a length protruding up to the surface of the frictional member having a wear allowable thickness, the other end being bent at a right angle from the middle, and being inverted to a portion near the tip thereof. A cut is made in a U-shape, and the cut portion is bent upward to form an elastic protruding piece 3.

On the other hand, the back metal is provided with a space in which a portion of the pad clip bent at a right angle can be attached and detached, and an opening in which a part of the space, specifically, a portion close to the tip, has an open upper portion of the space. Is provided. The dimensions of the opening are
It is preferable to form the elastic projection piece slightly larger than the dimension of the elastic projection piece. If the size of the opening is smaller than the elastic projection, the pad clip cannot be fixed, and if it is too large, the pad clip may rattle. There is no particular limitation on the length of the portion bent at a right angle.

The pad clip and the back metal have the above-described configurations. When the pad clip is fixed to the back metal,
Insert the elastic projection into the space provided on the back metal while inserting it down,
When the elastic projecting piece reaches the opening provided in a part of the space, the tip of the elastic projecting piece rebounds and can be locked and fixed to the side wall of the opening. Further, when removing the pad clip from the back metal, the pad clip can be easily removed by pulling out the pad clip with the elastic protruding piece being pressed down from above the opening.

The material of the friction member used in the disc brake pad of the present invention can be applied to any of a semi-metallic type and a non-steel type, and is not particularly limited. As the material of the friction member, generally known materials are used, for example, steel fiber, brass fiber, copper fiber, acrylic fiber, aramid fiber, phenol fiber, ceramic fiber, rock wool, potassium titanate fiber, calcium silicate fiber , Carbon fiber and other fibrous substances, phenolic resins, epoxy resins, melamine resins, thermosetting resins such as cashew resins, binders containing rubber compositions such as NBR, SBR and IR, and organic friction modifiers such as friction dust Inorganic friction modifiers such as graphite, barium sulfate, antimony trisulfide, calcium carbonate, and magnesium carbonate are used, and metal powders such as brass, brass, and copper are added as necessary.

The content of the fibrous substance in the above composition is preferably 30 to 50% by weight in the whole composition, and preferably 3 to 50% by weight.
More preferably, the content is 5 to 45% by weight. The content of the binder is preferably from 10 to 18% by weight, more preferably from 12 to 16% by weight, in the whole composition. The content of the organic friction modifier is preferably 5 to 15% by weight, more preferably 8 to 12% by weight in the whole composition. Further, the content of the inorganic friction modifier is preferably 25 to 45% by weight, more preferably 30 to 40% by weight in the whole composition. These components comprise 100% by weight of the total composition
It is blended so that

[0012] The disc brake pad according to the present invention comprises:
First, using a strip-shaped elastic material, a long U-shaped base and one end of the base are formed to have a length protruding up to a surface of a frictional member having a wear allowable thickness, and the other end is bent at a right angle from the middle thereof. A pad clip having an elastic protruding piece at a portion bent at a right angle is obtained.

On the other hand, the friction material composition is preformed into a predetermined shape, and then a back metal and a preformed body having a space provided on one side surface and an opening provided in a part of the space are inserted into a mold. After being provided, it is molded by a heat and pressure molding method, and then heat-treated. After cooling, the friction surface is polished to a predetermined thickness.

Next, the pad clip is inserted into the space provided in the back metal while pressing down the elastic protruding piece, and the elastic protruding piece is fixed by an opening provided in a part of the space of the back metal. In addition, the heating temperature at the time of molding in the above is 130 to
180 ° C is preferred, and 140 to 170 ° C is more preferred. The pressure is preferably from 30 to 70 MPa, more preferably from 45 to 55 MPa. The heat treatment temperature is preferably from 100 to 300 ° C, more preferably from 150 to 250 ° C.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a pad clip used in a disc brake pad according to an embodiment of the present invention. FIG. 2 is a partially omitted perspective view of a portion into which the pad clip shown in FIG. 1 is inserted. FIG. 1 is a cross-sectional view of an example disc brake pad. Reference numeral 1 denotes a pad clip. The pad clip 1 has a long U-shaped base 2 formed thereon, and one end has a length protruding up to a surface of a friction allowable length of the friction member. The other end is bent at a right angle from the middle, an elastic protruding piece 3 is provided at the bent portion at a right angle, and a space 5 for inserting the pad clip 1 is provided at the back metal 4, An opening 6 whose upper part is open is provided in a part of the space 5. 2 and FIG.
Is a friction member.

[0016]

Embodiments of the present invention will be described below. SUS301, which is a strip-shaped elastic material, is bent to form a long U-shaped base 2 as shown in FIG. 1, and one end thereof is cut to a length protruding up to the surface of the friction member with an allowable wear length. Was bent at a right angle from the middle, and an inverted U-shaped cut was made in a portion near the tip, and the cut portion was bent upward to obtain a pad clip in which the elastic protruding piece 3 was formed.

On the other hand, the components shown in Table 1 are blended, uniformly mixed by a mixer, preformed, and then the above-mentioned elastic protruding piece 3 is formed on one side surface in a mold as shown in FIG. A back metal 4 having a space 5 in which the pad clip 1 can be inserted, and an opening 6 which is partially exposed to the surface.
And after inserting the preform, 140 ° C ± 5 ° C and 50 ° C
Molding was performed by a heating and pressing molding method under the conditions of MPa for 10 minutes, and a heat treatment was further performed at 250 ° C. for 5 hours.

[0018]

[Table 1]

Next, in the space 5 provided in the back metal 4,
When the pad clip 1 is inserted while pressing down, when the elastic projection 3 reaches the position of the opening 6, the tip of the elastic projection 3 rebounds by elasticity as shown in FIG. Fixed.

[0020]

The disk brake pad according to the present invention does not require special equipment, jigs and the like, eliminates the problem that the pad clip is easily detached or hardly detached, and allows the pad clip to be easily removed. It is a removable disc brake pad.

[Brief description of the drawings]

FIG. 1 is a perspective view of a pad clip used for a disc brake pad according to an embodiment of the present invention.

FIG. 2 is a partially omitted perspective view of a portion into which the pad clip shown in FIG. 1 is inserted.

FIG. 3 is a sectional view of a disc brake pad according to an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 pad clip 2 long U-shaped base 3 elastic protrusion 4 back metal 5 space 6 opening 7 friction member

Claims (1)

[Claims] 1. A long U-shaped base and one end of the long U-shaped base are formed so as to protrude to a surface of a friction allowable thickness of a friction member, and the other end is formed in the middle. The disc brake pad has a pad clip fixed to one side surface of the back metal at the bent portion, and an elastic protrusion is formed at the portion bent at a right angle to the pad clip, while a pad clip is formed on the back metal. Provide a space where the part bent at a right angle can be attached and detached, and insert a pad clip while pressing down the elastic projection in this space,
A disc brake pad in which a pad clip is fixed to an opening of a backing metal such that a tip of the elastic protruding piece rebounds when the elastic protruding piece reaches an opening provided in a part of the space of the back metal.