CN217271551U

CN217271551U - Brake pad

Info

Publication number: CN217271551U
Application number: CN202221231660.7U
Authority: CN
Inventors: 徐熙庆; 刘壮
Original assignee: Knorr Bremse Systems for Rail Vehicles Suzhou Co Ltd
Current assignee: Knorr Bremse Systems for Rail Vehicles Suzhou Co Ltd
Priority date: 2022-05-20
Filing date: 2022-05-20
Publication date: 2022-08-23
Anticipated expiration: 2032-05-20

Abstract

The utility model discloses a brake pad, include: a friction member having a friction surface and a wear indicator disposed on the friction member; an accommodating space is formed on one side of the friction piece, which is far away from the friction surface, and the accommodating space is matched with the wear indicating piece and accommodates the wear indicating piece; the wear indicator is configured to form an easily detectable mark on the rubbed object after the rubbing is performed against the rubbed object. The embodiment of the utility model provides a wear and tear to a certain extent after at the friction part, wear and tear indicator outwards exposes and produces relative friction with the brake disc, and wear and tear indicator can form the vestige on the brake disc, and this vestige is the easy detection trace that detects for convenience, has realized whether to have through above-mentioned structure detecting on the brake disc easily to detect the trace and judge whether the friction part weares and teares in place, and then can more directly perceived effectual observation whether need change the brake lining.

Description

Brake pad

Technical Field

The utility model relates to a train braking accessory, especially brake block.

Background

The high-speed train usually adopts a disc brake system, a brake disc is arranged on an axle or on the side surface of a wheel spoke plate, two brake pads made of synthetic materials are tightly pressed on the side surface of the brake disc by using a brake clamp, and the train stops moving by generating a brake force through friction. The braking mode can greatly reduce the thermal load and mechanical abrasion of the wheel tread because the acting force is not on the wheel tread. In addition, the disc brake has large friction area, stable braking and good braking effect.

The core component of the high-speed train mechanical braking system is a friction pair consisting of a brake disc and a brake pad. The working main body of the brake pad is a friction piece which is made of friction material through a powder metallurgy process, so that the brake pad has high compression strength, bending strength and shearing strength, and excellent wear resistance and heat dissipation.

Need timely change the brake lining after the friction member wearing and tearing are accomplished among the prior art, need detect the thickness of friction member when detecting the brake lining of vehicle, thereby judge whether need to change the brake lining, mainly detect friction member thickness through the measuring mode among the prior art, change the brake lining promptly after the thickness that detects the friction member is less than a certain value, because the space at brake lining place is limited in the practical application in-process, adopt the measuring mode to hardly operate, thereby caused the inconvenient observation of friction member wearing and tearing condition, can not timely audio-visually confirm the wearing and tearing condition of friction member.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a brake lining to solve not enough among the prior art, it can more directly perceived efficient observe whether wearing and tearing target in place of friction member, and then can more directly perceived effectual judgement whether need change the brake lining.

The utility model provides a brake pad, include: a friction member having a friction surface and a wear indicator disposed on the friction member;

an accommodating space is formed on one side of the friction piece, which is far away from the friction surface, and the accommodating space is matched with the wear indicating piece and accommodates the wear indicating piece;

the wear indicator is configured to form an easily detectable mark on the rubbed object after the rubbed object is rubbed against the rubbed object.

Furthermore, the accommodating space is an installation groove which is arranged on the friction piece and is opened in the direction deviating from the direction of the friction surface, and the wear indication piece is positioned in the installation groove.

Further, the wear indicator may be a different color than the friction element or the wear indicator may be a fluorescent element.

Further, the wear indicator includes a first wear indicating portion and a second wear indicating portion, the first wear indicating portion being closer to the friction surface than the second wear indicating portion, the first wear indicating portion and the second wear indicating portion being different colors.

Further, a direction indicating structure is arranged on the wear indicating piece;

the direction indicating structure is an indicating groove arranged on the first wear indicating part, and the indicating groove is opened towards the direction away from the second wear indicating part; or

The direction indicating structure is an indicating groove arranged on the second wear indicating part, and the indicating groove is arranged towards the direction opening departing from the first wear indicating part.

Further, the first wear indicator and the second wear indicator are coaxially arranged, and the size of the cross section of the first wear indicator is different from the size of the cross section of the second wear indicator.

Further, the first wear indicator cross-section has a dimension that is less than a dimension of the second wear indicator cross-section; the accommodating space is internally provided with a first groove body matched with the first wear indicating part and a second groove body matched with the second wear indicating part.

Furthermore, the brake pad is also provided with a supporting plate and a brake pad installing joint, and the brake pad installing joint is arranged on one side of the friction piece, which is deviated from the friction surface, and is matched with the supporting plate to install and fix the friction piece.

Further, the wear indicator is provided with a plurality of wear indicators, and the plurality of wear indicators are arranged at the edge of the friction piece and arranged along the outline of the friction piece.

Furthermore, the brake pad is also provided with a support plate and a plurality of friction components arranged on the support plate, and each friction component comprises a back plate and the friction piece arranged on the back plate.

Compared with the prior art, the utility model discloses wearing and tearing to the certain degree after at the friction part, the wearing and tearing indicator outwards exposes and produces relative friction with the brake disc, and the wearing and tearing indicator can form the vestige on the brake disc, and this vestige is easy to detect the trace for the detection, thereby has realized whether have easy detection trace through detecting on the brake disc and judge whether wearing and tearing of friction part target in place through above-mentioned structure, and then can more directly perceived effectual observation whether need change the brake lining.

Drawings

Fig. 1 is an exploded view of a brake pad disclosed in an embodiment of the present invention;

FIG. 2 is a schematic view of an assembly of a brake pad disclosed in an embodiment of the present invention;

fig. 3 is an exploded view of the first friction assembly and the pin shaft of the brake pad according to the embodiment of the present invention;

fig. 4 is a schematic structural view of a pin shaft in a brake pad disclosed in an embodiment of the present invention;

fig. 5 is a schematic view illustrating the assembly of the first friction component and the pin shaft in the brake pad disclosed in the embodiment of the present invention;

FIG. 6 is an enlarged view of a portion of FIG. 5 at A;

FIG. 7 is a top view of a friction member with reinforcement incorporated therein in a brake pad in accordance with an embodiment of the present invention;

FIG. 8 is a cross-sectional view taken in the direction BB in FIG. 7;

FIG. 9 is a schematic structural view of a wear indicator in a brake pad according to an embodiment of the present invention;

fig. 10 is an exploded view of the second friction assembly and the pin of the brake pad according to the embodiment of the present invention;

fig. 11 is a schematic view of an assembly structure of a second friction component and a pin shaft in a brake pad disclosed in an embodiment of the present invention;

FIG. 12 is an enlarged partial schematic view at C of FIG. 11;

fig. 13 is a schematic view of another wear indicator mounting configuration disclosed in an embodiment of the present invention;

fig. 14 is an exploded view of a first assembly structure of a third friction component and a pin shaft in the brake pad disclosed in the embodiment of the present invention;

fig. 15 is an exploded view of a second assembly structure of a third friction component and a pin shaft in the brake pad disclosed in the embodiment of the present invention;

fig. 16 is a schematic view of an assembly structure of a third friction component and a pin shaft in the brake pad disclosed in the embodiment of the present invention;

FIG. 17 is a schematic structural view of a friction member of another brake pad disclosed in an embodiment of the present invention;

FIG. 18 is a front elevational view of a friction member of another brake pad disclosed in an embodiment of the present invention;

description of reference numerals: 1-a support plate, 11-a support plate positioning groove,

2-friction component, 21-friction piece, 210-friction piece through hole, 211-bearing part, 212-positioning groove, 213-positioning part, 214-groove body, 215-friction surface, 216-accommodation space,

22-back plate, 220-back plate through hole, 221-back plate limiting part, 222-hemispherical protrusion, 223-limiting groove, 224-positioning column,

23-a reinforcing member, 231-a reinforcing plate, 232-a reinforcing ring, 233-an embedded part,

3-fastening component, 31-pin shaft, 310-axial limiting part, 311-first shaft body, 312-second shaft body, 32-crimping part, 33-fastening piece, 4-disc spring, 5-protective gasket,

6-wear indicator, 61-first wear indicator, 62-second wear indicator, 63-indicator groove, 7-brake pad mounting tab.

Detailed Description

The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

The embodiment of the utility model discloses a brake lining, this brake lining be used for high-speed train and with the brake disc cooperation of train in order to realize the brake braking of train, brake lining sets up on the braking clamp, thereby moves to the brake disc direction under the effect of braking clamp so that the friction member on the brake lining compresses tightly the laminating and realizes brake disc pivoted control on the brake disc.

As shown in fig. 1, the brake pad includes a friction member 21 having a friction surface 215 and a wear indicator 6 provided on the friction member 21;

an accommodating space 216 is formed on one side of the friction piece 21 away from the friction surface 215, and the accommodating space 216 is matched with the wear indicator 6 and accommodates the wear indicator 6;

the wear indicator 6 is provided to form an easily detectable mark on the rubbed object after the rubbing against the rubbed object is generated.

Being the brake disc by the thing that rubs in this embodiment, wearing and tearing to a certain extent back at friction spare 21, wearing and tearing indicator 6 outwards exposes and produces relative friction with the brake disc, wearing and tearing indicator 6 can form the vestige on the brake disc, and this vestige is the easy detection trace that detects for convenience, has realized through above-mentioned structure whether have the easy detection trace on the brake disc and judge whether wearing and tearing of friction spare 21 target in place, and then can more directly perceived effectual observation whether need change the brake lining.

In a specific embodiment, the easily detectable mark may be a mark with color, which is directly observed on the brake disc by naked eyes, or the easily detectable mark may be a fluorescent material adhered on the brake disc after the fluorescent material is rubbed, and whether the fluorescent material is present or not is observed by illuminating the brake disc during detection, if so, it indicates that the friction member 21 is worn in place, so that the need for replacing the brake pad can be determined in time.

It will be appreciated that in order to achieve the above, the wear indicator 6 is a different colour to the friction member 21 or the wear indicator 6 is a fluorescent member.

It should be noted that the specific material of the wear indicator 6, which is a non-fluorescent member, is not particularly limited herein, as long as the prior art can form a friction mark on a rubbed object after being rubbed, different pigments can be doped in the above material to form different friction marks, and the above material can be rubber or organic synthetic member of different pigments.

As shown in fig. 3, in order to facilitate loading of the wear indicator 6 on the friction member 21, the receiving space 216 is a mounting groove provided on the friction member 21 and opening in a direction away from the friction surface 21, and the wear indicator 6 is positioned in the mounting groove.

The wear indicator 6 may be installed and fixed by forming an installation groove on the friction member 21 after the friction member 21 is molded, or the installation groove may be reserved in advance in the process of molding the friction member 21, and then the wear indicator 6 is loaded in the installation groove.

In another embodiment, the wear indicator 6 may be encapsulated in the friction member 21 during the molding process of the friction member 21, and the accommodating space 216 may be understood as a cavity disposed in the friction member 21, and the wear indicator 6 is filled in the cavity.

As shown in fig. 11 to 13, the wear indicating member 6 includes a first wear indicating portion 61 and a second wear indicating portion 62, the first wear indicating portion 61 is closer to the frictional surface 215 than the second wear indicating portion 62, and the first wear indicating portion 61 and the second wear indicating portion 62 are different in color.

The wear indication parts with two different colors can better monitor the wear degree of the friction piece 21, the first wear indication part 61 can be set to be yellow, the second indication part 62 is set to be red, yellow easily-detected marks are formed on the brake disc after the first wear indication part 61 is worn, only the fact that the brake disc needs to be noticed is achieved, after the second wear indication part 62 is worn, the second wear indication part 62 is relatively arranged at a position far away from the friction surface 215, the second wear indication part 62 indicates that the wear is serious after being worn, the second wear indication part 62 forms red marks on the brake disc, the red marks have a warning effect, and observation can be achieved more visually.

Providing the first wear indicating portion 61 and the second wear indicating portion 62 enables two-stage indication, thereby achieving better indication. Of course, in other embodiments, a multi-level reminder may be set, and when the multi-level reminder is set, only more wear indicators need to be set.

Because two-stage reminding is arranged, the wear indicator 6 has directivity, the installation and fixation of the wear indicator 6 need to be along a specific direction, and a direction indicating structure is arranged on the wear indicator 6 in order to conveniently realize the installation and fixation of the wear indicator 6;

as shown in fig. 11 and 12, the direction indicating structure is an indicating groove provided on the first wear indicating portion 61, the indicating groove being opened in a direction away from the second wear indicating portion 62.

Of course, in another embodiment, as shown in fig. 13, the direction indicating structure is an indicating groove provided on the second wear indicating portion 62, and the indicating groove is opened in a direction away from the first wear indicating portion 61.

In the present embodiment, as shown in fig. 9, the first wear indicator 61 and the second wear indicator 62 are coaxially disposed, and the size of the cross section of the first wear indicator 61 is different from that of the cross section of the second wear indicator 62. The cross-sectional dimensions of the first wear indicating part 61 and the second wear indicating part 62 are set so as not to differ such that the wear indicator 6 has a pyramid type or an inverted pyramid type, thereby providing the wear indicator 6 with direction indication.

In order to conveniently realize the installation and fixation of the wear indicator 6, the size of the cross section of the first wear indicator part 61 is smaller than that of the cross section of the second wear indicator part 62; the mounting groove 63 is internally provided with a first groove body matched with the first wear indicating part 61 and a second groove body matched with the second wear indicating part 62.

The brake pad in this embodiment further has a back plate 22 engaged with the friction member 21, the friction member 21 and the back plate 22 constitute a friction assembly 2, the brake pad further has a support plate 1 and a fastening assembly 3, the friction assembly 2 is assembled to the support plate 1 by the fastening assembly 3, and one support plate 1 may be provided with a plurality of friction assemblies 2.

The fastening component 3 in this embodiment comprises a pin 31 penetrating through the friction component 2 and the support plate 1, a crimping part 32 arranged at one end of the pin 31 and a fastening part 33;

the friction piece 21 is provided with a friction piece perforation 210 matched with the pin shaft 31 and a pressure-bearing part 211 matched with the pressure-bearing part 32; the press-contact part 32 is pressed and fixed on the press-contact part 211 and presses and fixes the friction piece 21 on the back plate 22; it can be understood that the back plate 22 is provided with a back plate through hole 220 adapted to the pin 31;

the fastening member 33 is arranged on the side of the support plate 1 facing away from the friction component 2, and the fastening member 33 cooperates with the pin 31 to clamp and position the back plate 22 between the friction member 21 and the support plate 1.

As shown in fig. 2 and 6, the fastening part 33 and the pressure-bonding part 32 are oppositely arranged on both sides of the support plate 1, after the fastening part 33 is loaded and matched with the pin 31, the pressure-bonding part 32 is abutted against the pressure-bearing part 211, the pressure-bearing part 211 is pressure-bonded and attached to the back plate 22, and the back plate 22 is press-positioned on the support plate 1 under the left and right sides of the pressure-bonding part 32.

As shown in fig. 1 and fig. 2, the fastening member 33 may be an installation clamp spring, the pin 31 is provided with a pin groove adapted to the installation clamp spring, and the installation clamp spring is clamped in the pin groove.

Further, the brake pad further comprises a disc spring 4 and a protective pad 5 which are arranged between the back plate 22 and the support plate 1, a support plate positioning groove 11 which is arranged towards the opening of the friction component 2 is formed in the support plate 1, the support plate positioning groove 11 is matched with the disc spring 4, and the disc spring 4 is positioned in the support plate positioning groove 11.

One end of the cup spring 4 may bear directly against the back plate 22, although in another embodiment a protective spacer 5 may also be provided between the cup spring 4 and the back plate 22.

In the embodiment, the fastening component 3 presses the friction piece 21 and the back plate 22 which are separated, tightly, and simultaneously presses the friction component 2 consisting of the friction piece 21 and the back plate 22 to be positioned on the support plate 1 under the action of the fastening component 3, so that the friction piece 21 is conveniently mounted and fixed through the structure, and the assembly is simpler.

It can be understood that, in order to enable the pin 31 to penetrate through the friction component 2, the back plate through hole 220 is opposite to the friction member through hole 210, and the size of the back plate through hole 220 is smaller than that of the friction member through hole 210; a back plate limiting part 221 is arranged on the back plate 22 opposite to the friction piece through hole 210; the pin 31 is provided with an axial limiting portion 310 for abutting against the back plate limiting portion 221.

In this embodiment, the friction member 21 is damaged or falls off due to an unexpected situation, as shown in fig. 6, a gap is formed at a position where a part of the friction member 21 that is originally clamped between the crimping portion 32 and the back plate is located after falling off, and the existence of the gap easily causes the pin 31 to shake in the axial direction.

In order to avoid the above problem, as shown in fig. 6, a back plate limiting portion 221 is disposed on the back plate 22, and an axial limiting portion 310 adapted to the back plate limiting portion 221 is disposed on the pin 31, where the axial limiting portion 310 is configured to abut against the back plate limiting portion 221 to prevent the pin 31 from moving in the axial direction.

As shown in fig. 4, the pin 31 includes a first shaft body 311 and a second shaft body 312 coaxially arranged, the pressure-bonding part 32 is arranged on a side of the first shaft body 311 away from the second shaft body 312, the pressure-bonding part 32 is a pressure-bonding plate, a cross-sectional dimension of the pressure-bonding plate is larger than that of the first shaft body 311, and the pressure-bonding plate presses and fixes part of the friction member 21 on the back plate.

The pin shaft 3 further has a third shaft body disposed on the second shaft body 312, and the pin shaft groove is disposed on the third shaft body.

The first shaft 311 is fitted into the friction member through hole 210, and the second shaft 312 is fitted into the back plate through hole 220; the second shaft body 312 and the back plate through hole 220 may be in an interference fit, and for facilitating the assembly of the back plate 22 and the second shaft body 312, the diameter of the third shaft body is smaller than the diameter of the second shaft body 312.

The cross-sectional dimension of the first shaft body 311 is greater than the cross-sectional dimension of the second shaft body 312 so as to form a limit table located beside the second shaft body 312 on the first shaft body 311, and the axial limit portion 310 is arranged on the limit table.

As shown in fig. 6, the dimension of the first shaft 311 in the axial direction is smaller than the hole depth of the friction member through hole 210 to form a gap portion between the axial direction limiting portion 310 and the back plate limiting portion 221.

The gap can make the press-connecting part 32 press and fix the friction member 21 on the back plate 22 better, and if the axial limiting part 310 abuts directly on the back plate limiting part 221, the press and fixation of the press-connecting part 32 on the friction member 21 will be affected.

The friction piece 21 can be compressed when being elastically deformed because of elastic deformation generated after crimping, and the existence of the gap part can offset the compression amount, so that the crimping acting force applied to the friction piece 21 by the crimping part 32 is completely transmitted to the back plate 22, and the compression positioning of the friction piece 21 is better realized.

It can be understood that the size of the gap portion is small, so that the axial limiting portion 310 does not move a large distance to achieve the contact with the back plate limiting portion 221 after the friction member 21 falls off, and the movement of the pin 31 in the axial direction is avoided as much as possible.

As shown in fig. 5, in the present embodiment, the friction member 21 has a positioning groove 212 disposed facing away from the back plate 22, the friction member through hole 210 is communicated with the positioning groove 212 and has an inlet located at the bottom of the positioning groove 212, and the pressing portion 211 is disposed at the bottom of the positioning groove 212 and beside the inlet; the press contact portion 32 is positioned in the positioning groove 212 and abuts on the press contact portion 211.

The positioning of the crimping part 32 can be conveniently realized by arranging the positioning groove 212, and the assembly of the pin 31 can be better realized by arranging the positioning groove 212 to be arranged towards the opening away from the back plate 22.

As shown in fig. 7 to 8, the friction member 2 further has a reinforcing member 23 provided on the friction member 21, the reinforcing member 23 includes a reinforcing plate 231 provided on the pressure-receiving portion 211 and a reinforcing ring 232 provided on a side wall of the friction member through hole 210, the pressure-receiving portion 32 abuts on the reinforcing plate 231, and the reinforcing plate 231 has a ring-shaped configuration.

The provision of the reinforcing member 23 can improve the stability of the fitting of the crimping portion 32 to the friction member 21, and the reinforcing member 23 can be integrally formed during the formation of the friction member 21 by adding a reinforcing material during the manufacture of the friction member 21.

It will be appreciated that the size of the stiffener ring 232 in the axial direction is less than or equal to the bore depth of the friction member bore 210, thereby avoiding the stiffener ring 232 from being supported between the crimp 32 and the backing plate 22 and thus avoiding a reduction in the compression of the friction member 21 after the stiffener ring is used.

The reinforcing ring 232 and the reinforcing plate 231 are integrally formed, and the reinforcing member 23 further has a pre-embedded portion 233 which is disposed on the reinforcing ring 232 and extends into the friction member 21. The pre-embedded parts 233 are pre-placed in the friction member 21 in the process of forming the friction member 21, the pre-embedded parts 233 are multiple, the pre-embedded parts 233 are arranged along the circumferential direction of the reinforcing member 23, and the pre-embedded parts 233 and the reinforcing plate 231 are integrally formed.

Further, as shown in fig. 1 to 3, a hemispherical protrusion 222 is disposed on a side of the back plate 22 away from the friction member 21, the hemispherical protrusion 222 is disposed at a central position of the back plate 22, and the back plate through hole 220 is disposed at a central position of the hemispherical protrusion 222.

The back plate 22 is abutted against the disc spring through the hemispherical protrusion 222 when being abutted and pressed on the support plate 1, and the arrangement of the hemispherical protrusion 222 can ensure that the back plate 22 has a certain moving space after being installed and fixed, so that the brake disc is more flexibly applicable to uneven brake discs.

In this embodiment, since the back plate 22 and the friction member 21 are only fixedly assembled by crimping, in order to prevent the back plate 22 and the friction member 21 from rotating relatively, the brake pad further has a rotation limiting component;

as shown in fig. 3 and 10, the rotation limiting assembly includes a limiting groove 223 disposed on the back plate 22 and opening toward the friction member 21, a positioning portion 213 adapted to the limiting groove 223 is formed on the friction member 21, and a cross section of the positioning portion 213 is triangular, quadrangular or polygonal. The positioning portion 213 has a hexagonal cross section in the present embodiment.

As shown in fig. 14 to 16, in another embodiment, the rotation limiting assembly includes a positioning post 224 disposed on the back plate 22 and protruding toward the friction member 21, a groove 214 adapted to the positioning post 224 is disposed on the friction member 21, and the rotation limiting of the back plate 22 and the friction member 21 is realized by the cooperation of the positioning post 224 and the groove 214, it can be understood that the rotation limiting of the back plate 22 and the friction member 21 can be realized only by at least two sets of the rotation limiting assemblies disposed between the back plate 22 and the friction member 21.

In the above embodiment, the brake disc is braked and controlled by the friction assembly 2 composed of the back plate 22 and the friction member 21, and the support plate 1 is provided with a plurality of friction assemblies 2. In another embodiment, a one-piece friction member may be provided on the support plate 7.

Specifically, as shown in fig. 17 and 18, the brake pad further has a brake pad mounting tab 7, and the brake pad mounting tab 7 is disposed on a side of the friction member 21 facing away from the friction surface 215 and is used for fixing the friction member 21.

In this embodiment, the wear indicator 6 is provided in plurality, and a plurality of wear indicators 6 are provided at the edge of the friction member 7 and arranged along the contour of the friction member. The receiving space 216 may be a cavity provided in the friction element 21 or a mounting groove provided on the friction element 21, and the mounting groove is provided towards the opening facing away from the friction surface 215.

The structure, features and effects of the present invention have been described in detail above according to the embodiment shown in the drawings, and the above description is only the preferred embodiment of the present invention, but the present invention is not limited to the implementation scope shown in the drawings, and all changes made according to the idea of the present invention or equivalent embodiments modified to the same changes should be considered within the protection scope of the present invention when not exceeding the spirit covered by the description and drawings.

Claims

1. A brake pad, comprising: a friction member having a friction surface and a wear indicator disposed on the friction member;

the wear indicator is configured to form an easily detectable mark on the rubbed object after the rubbing is performed against the rubbed object.

2. The brake pad of claim 1, wherein: the accommodating space is an installation groove which is arranged on the friction piece and is opened towards the direction deviating from the friction surface, and the wear indication piece is positioned in the installation groove.

3. The brake pad of claim 1, wherein: the wear indicator is a different color than the friction member or the wear indicator is a fluorescent member.

4. The brake pad of claim 1, wherein: the wear indicator includes a first wear indicator portion and a second wear indicator portion, the first wear indicator portion being closer to the friction surface than the second wear indicator portion, the first wear indicator portion and the second wear indicator portion being different colors.

5. The brake pad of claim 4, wherein: a direction indicating structure is arranged on the wear indicating piece;

The direction indicating structure is an indicating groove arranged on the second wear indicating part, and the indicating groove is arranged towards a direction opening departing from the first wear indicating part.

6. The brake pad of claim 4, wherein: the first wear indicator and the second wear indicator are coaxially disposed, and a cross-sectional dimension of the first wear indicator is different from a cross-sectional dimension of the second wear indicator.

7. The brake pad of claim 6, wherein: the first wear indicator cross-section having a dimension less than a dimension of the second wear indicator cross-section; the accommodating space is internally provided with a first groove body matched with the first wear indicating part and a second groove body matched with the second wear indicating part.

8. The brake pad of any one of claims 1 to 7, wherein: the brake pad is also provided with a supporting plate and a brake pad installing joint, and the brake pad installing joint is arranged on one side of the friction piece, which deviates from the friction surface, and is matched with the supporting plate to fix the friction piece.

9. The brake pad of claim 7, wherein: the wear indicator is provided with a plurality of wear indicators, and the plurality of wear indicators are arranged at the edge of the friction member and arranged along the outline of the friction member.

10. The brake pad of any one of claims 1 to 7, wherein: the brake pad is also provided with a support plate and a plurality of friction components arranged on the support plate, and each friction component comprises a back plate and the friction piece arranged on the back plate.