TW201936729A - Friction member and brake pad capable of providing high wear resistance - Google Patents

Abstract

The present invention provides a friction member and a brake pad having high wear resistance. The friction member has a friction surface in contact with a rotating body. The friction member includes zinc fibers, wherein an area of the friction surface is 150 mm<2> or more and 600 mm<2> or less. Furthermore, the friction surface has a first size of 15 mm or more and 30 mm or less in a first direction in parallel with the friction surface, and a second size of 10 mm or more and 20 mm or less in a second direction in parallel with the friction surface and perpendicular to the first direction.

Description

Friction members and brake pads

The present invention relates to a friction member and a brake pad.

Patent Document 1 discloses a friction material composition used in a disc brake pad of an automobile or the like. The friction material composition described in Patent Document 1 includes one or two or more of copper fibers, zinc fibers, and brass fibers. This friction material composition is used to suppress noise generated during braking. On the other hand, it is known that a friction material composition as a disc brake pad for a bicycle uses brass fibers.
[Advanced technical literature]
[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 59-64687

[Problems to be Solved by the Invention]

An object of the present invention is to provide a friction member and a brake pad having high wear resistance.

[Means to solve the problem]

A friction member according to a first aspect of the present invention is a friction member having a friction surface that is in contact with a rotating body, and includes zinc fibers. The area of the friction surface is 150 mm ² or more and 600 mm ² or less.
The friction member of the first aspect described above can improve abrasion resistance as compared with a friction member mainly containing brass fibers as a friction agent.

In the friction member according to the second aspect of the first aspect, the first dimension of the friction surface in the first direction parallel to the friction surface is 15 mm or more and 30 mm or less.
The friction member of the second type described above maintains the braking performance by setting the first dimension to 15 mm or more, and tightly composes by setting the first dimension to 30 mm or less.

In the friction member according to the third aspect of the second aspect, the second dimension of the friction surface in the second direction parallel to the friction surface and perpendicular to the first direction is 10 mm or more and 20 mm or less.
The friction member of the third type described above maintains the braking performance by setting the second dimension to 10 mm or more, and tightly composes by setting the second dimension to 20 mm or less.

A friction member of a fourth aspect of the present invention has a friction surface that is in contact with the rotating body. The friction member includes zinc fibers, and the first dimension of the friction surface in a first direction parallel to the friction surface is 15 mm 30 mm or more; the second dimension of the friction surface in a second direction parallel to the friction surface and perpendicular to the first direction is 10 mm or more and 20 mm or less.
With the friction member of the fourth type, the braking performance is maintained by setting the first size to 15 mm or more and the second size to 10 mm or more, and by setting the first size to 30 mm or less and the second size. If it is set to 20mm or less, the composition can be made compact.

In the fifth aspect of the friction member according to the third or fourth aspect, the second dimension is smaller than the first dimension.
With the friction member of the fifth aspect described above, the first dimension is made larger along the rotation direction of the rotating body, so that the rotating body can be properly contacted.

In the friction member of the sixth aspect according to any of the second to fifth aspects, the friction member is bent in the first direction and unevenness is formed.
With the friction member of the sixth aspect, the friction surface can be arranged along the rotation direction of the rotating body, thereby improving the braking performance.

In the seventh aspect of the friction member according to any one of the first to sixth aspects, the size of the friction member in the third direction perpendicular to the friction surface is 1.5 mm to 5 mm.
With the friction member of the seventh aspect, the strength is maintained by setting the third dimension to 1.5 mm or more, and the third member can be tightly composed by setting the third dimension to 5 mm or less.

The friction member according to the eighth aspect according to any one of the first to seventh aspects, further comprising a binder.
With the friction member of the eighth aspect, appropriate strength can be obtained.

The ninth aspect of the friction member according to any one of the first to eighth aspects further includes a friction modifier.
With the ninth aspect of the friction member, the frictional force against the rotating body can be appropriately adjusted.

The tenth aspect friction member according to any one of the first to ninth aspects, further includes an abrasive.
With the tenth aspect of the friction member, braking performance can be improved.

The friction member according to the eleventh aspect according to any one of the first to tenth aspects, further comprising a reinforcing agent.
The friction member of the eleventh aspect can appropriately maintain the shape.

The twelfth aspect of the friction member according to any one of the first to eleventh aspects further includes a volume modifier.
With the friction member of the twelfth aspect, an appropriate volume can be obtained.

The friction member of the thirteenth aspect according to any one of the first to twelfth aspects, further includes a rust adhesion preventing agent.
The friction member of the thirteenth aspect can suppress rust adhesion.

The friction member according to a fourteenth aspect according to any one of the first to thirteenth aspects, further comprising a sliding noise reducing agent.
With the friction member of the fourteenth aspect, it is possible to reduce the sound generated by the sliding of the friction member and the rotating body.

In the friction member of the 15th aspect based on any one of the 1st to 14th aspects, the average diameter of the said zinc fiber is 40 micrometers or more and 140 micrometers or less.
With the friction member of the 15th aspect described above, it is possible to generate an appropriate frictional force between the rotating body and the friction member.

In the friction member of the sixteenth aspect according to any one of the first to fifteenth aspects, the average length of the zinc fiber is 0.8 mm or more and 2.8 mm or less.
With the friction member of the 16th type, by setting the average length of the zinc fiber to 0.8 mm or more, it is possible to generate an appropriate friction force between the rotating body and the friction member, and by setting the average length of the zinc fiber When it is 2.8 mm or less, formability can be improved.

In the friction member of the 17th aspect based on any of the said 1st to 16th aspect, the mass ratio of the said zinc fiber of the said friction member is 15%-40%.
With the friction member of the seventeenth aspect, an appropriate frictional force can be generated between the rotating body and the friction member.

In the friction member of the eighteenth aspect according to any one of the first to seventeenth aspects, the volume ratio of the zinc fibers of the friction member is 5% to 30%.
With the friction member of the eighteenth aspect, an appropriate frictional force can be generated between the rotating body and the friction member.

A brake pad of a nineteenth aspect includes the friction member of any one of the first to eighth aspects, and a back plate for supporting the friction member.
The brake pad of the 19th type described above can be easily mounted on a brake caliper of a bicycle.

In the brake pad of the twentieth aspect according to the nineteenth aspect, the friction member is adhered to the back plate.
With the brake pad of the above-mentioned type 20, the friction member can be easily coupled to the back plate.

In the brake pad of the 21st aspect based on said 19th or 20th aspect, the said back plate is formed with any one of an iron alloy, titanium, a titanium alloy, and an aluminum alloy.
With the above-mentioned brake disc of the 21st type, high rigidity can be obtained.

In the brake pad of the 22nd aspect according to any one of said 19th to 21st aspects, the said backplate contains the support part which supports the said friction member, and the heat radiation part which has a heat radiation structure.
The brake pad of the 22nd type described above can suppress heat generation during braking.

In the brake pad of the 23rd aspect based on the 22nd aspect, the said heat radiation structure includes a blade.
With the brake pad of the 23rd type, the heat dissipation structure is simplified and can be easily manufactured.

[Inventive effect]

The friction member and the brake pad of the present invention can improve the wear resistance.

(Embodiment)
A brake pad 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
The brake pads 10 are mounted on, for example, a human-powered vehicle. Here, the human-powered driving vehicle 10 represents a vehicle that uses human power at least in part with respect to the power used for traveling, and includes a vehicle that assists human power by electric means. Vehicles that use only power other than human power are not included in human powered vehicles. Vehicles powered only by internal combustion engines are not included in human-powered vehicles. A typical human-powered vehicle is intended to be a small and light vehicle, and is intended to be a vehicle that does not require a driving license on a highway. Human-powered vehicles include: bicycles that are propelled by human power only, bicycles that use electric energy to assist manpower (e-bike), unicycles that use only electric energy to propel, two-wheelers, and tricycles. The brake pads 10 are attached to a rotation shaft of a wheel, and brake a rotating body that rotates in synchronization with the wheel. As an example, the rotating body includes a disc brake disc. The brake pad 10 has a friction surface 12A (refer to later), and the friction surface 12A is in contact with at least one surface that intersects with the rotation center axis of the rotating body, that is, the braking surface. The brake pad 10 reduces the rotation speed of the rotating body by contacting the friction surface 12A of the brake pad 10 with the braking surface of the rotating body. The "rotating body" in the embodiment represents a disc brake disc (not shown).

As shown in FIG. 1, the brake pad 10 includes a friction member 12 and a back plate 14 for supporting the friction member 12. At the brake pad 10, the friction member 12 is adhered to the back plate 14. For example, the friction member 12 is adhered to the back plate 14 by thermocompression bonding. The friction member 12 is adhered to the back plate 14 by an adhesive material.

The back plate 14 includes a support portion 16 for supporting the friction member 12 and a connection portion 18 extending from the support portion 16 and connected to the brake caliper. The support portion 16 includes a first surface 16A facing the rotating body and a second surface 16B opposite to the first surface 16A in a state where the back plate 14 is mounted on a brake caliper of a manual driving vehicle. The friction member 12 is adhered to the first surface 16A. The first surface 16A is preferably parallel to a friction surface 12A described later. The connecting portion 18 includes a through hole 18A. The brake pad 10 is attached to the brake caliper by passing a pin of a brake caliper (not shown) through the through hole 18A. The back plate 14 is formed of any one of an iron alloy, titanium, a titanium alloy, and an aluminum alloy. A dimension L1 of the support portion 16 of the back plate 14 in a direction perpendicular to the first surface 16A is smaller than a dimension L2 of the friction member 12 in a third direction D3 perpendicular to the friction surface 12A of the friction member 12 (refer to FIG. 2). ). In the friction member 12, the size L2 of the friction member 12 in the third direction D3 perpendicular to the friction surface 12A is 1.5 mm to 5 mm.

The friction member 12 will be described next. The friction member 12 is a friction member 12 having a friction surface 12A that is in contact with the rotating body, and includes zinc fibers. The area of the friction surface 12A is 150 mm ² or more and 600 mm ² or less. The area of the friction surface 12A is more preferably 250 mm ² or more and 500 mm ² or less. The first dimension L3 of the friction surface 12A in the first direction D1 parallel to the friction surface 12A is 15 mm or more and 30 mm or less. The second dimension L4 of the friction surface 12A in the second direction D2 parallel to the friction surface 12A and perpendicular to the first direction D1 is 10 mm or more and 20 mm or less. In the friction member 12, the second dimension L4 is preferably smaller than the first dimension L3.

The friction member 12 is arranged such that the second direction D2 of the friction member 12 is in a radial direction perpendicular to the rotation center axis of the rotating body in a state where the back plate 14 is mounted on a brake caliper of a human-driven vehicle. This allows the longitudinal direction of the friction member 12, that is, the first direction D1 to be substantially along the rotation direction of the rotating body. In addition, the friction member 12 is preferably curved in the first direction D1 to form unevenness. Thereby, the friction member 12 can be more along the rotation direction of a rotating body.

The friction member 12 further includes a tapered surface 12B. The tapered surface 12B is provided to be continuous with the friction surface 12A. The tapered surface 12B is inclined from the friction surface 12A toward the support portion 16 of the back plate 14. It is preferable that the tapered surface 12B extends from the end edge opposite to the connecting portion 18 in the second direction D2 on the friction surface 12A.

The friction member 12 includes zinc fibers as described above. Zinc fiber is a friction agent. The average diameter of the zinc fibers is preferably from 40 μm to 140 μm. The average diameter of the zinc fibers is more preferably from 50 μm to 130 μm. The average diameter here means the median diameter. The average diameter of each fiber shown below represents the median diameter.

The average length of the zinc fiber is preferably 0.8 mm to 2.8 mm. The average length of the zinc fiber is preferably 1.0 mm or more and 2.6 mm or less. The length of the zinc fiber refers to a length when the zinc fiber is made linear, and when the zinc fiber is bent, it indicates a length when the bent zinc fiber is extended to a linear shape. The average length represents the arithmetic mean of the length.

The mass ratio of the zinc fiber in the friction member 12 is preferably 15% or more and 40% or less. The mass ratio of the zinc fiber of the friction member 12 is more preferably 18% or more and 38% or less. The volume ratio of the zinc fibers of the friction member 12 is preferably 5% or more and 30% or less. The volume ratio of the zinc fiber of the friction member 12 is more preferably 7% to 28%.

In addition to the zinc fiber, the friction member 12 preferably contains at least one of the following materials. The friction member 12 further contains a binding agent. The bonding agent is used to bond the materials constituting the friction member 12. The binder is a resin having adhesiveness and heat resistance. Examples of the binder include a phenol resin, a melamine resin, and an epoxy resin. One or more of these substances are selected for use as a binding agent. In order to maintain the cohesiveness of the material constituting the friction member 12, the mass ratio of the binder in the friction member 12 is preferably 5% to 15%. For the same reason, it is preferable that the volume ratio of the binder in the friction member 12 is 15% or more and 25% or less.

The friction member 12 further contains a friction modifier. The friction modifier is used to adjust the dynamic friction coefficient between the friction member 12 and the rotating body. The friction modifier is used to adjust the frictional force of the friction member 12 with respect to the rotating body. Examples of the friction modifier include graphite, coke, molybdenum disulfide, and antimony trisulfide. One or more of these substances are selected for use as a friction modifier. In order to properly maintain the sliding property of the friction member 12 with respect to the rotating body, the mass ratio of the friction modifier in the friction member 12 is preferably 2% or more and 7% or less. For the same reason, it is preferable that the volume ratio of the friction modifier in the friction member 12 is 3% or more and 10% or less.

The friction member 12 further contains an abrasive. The abrasive is used to improve the braking performance caused by the contact between the friction member 12 and the rotating body. The Vickers hardness of the friction member 12 is higher than the Vickers hardness of the rotating body. Examples of the abrasive include silicon carbide, aluminum oxide, and chromium oxide (Cr ₂ O ₃ ). One or more of these substances are selected for use as an abrasive. It is suitable to use silicon carbide and chromium oxide (Cr ₂ O ₃ ) in bicycle use. In order to properly maintain the braking performance of the friction member 12, it is preferable that the mass ratio of the abrasive in the friction member 12 is 10% or more and 30% or less. For the same reason, it is preferable that the volume ratio of the abrasive in the friction member 12 is 10% or more and 30% or less. Among the abrasives exemplified above, the friction member 12 preferably contains silicon carbide. The average diameter of the silicon carbide is preferably 1 μm or more and 20 μm or less. The friction member 12 preferably contains chromium oxide (Cr ₂ O ₃ ). The average diameter of chromium oxide is preferably from 0.1 μm to 5 μm. The friction member 12 is more preferably composed of two materials, silicon carbide and chromium oxide.

The friction member 12 further contains a reinforcing agent. A reinforcing agent is used to properly hold the friction member 12. The term “high shape retention” refers to a state where the friction member 12 is in contact with the rotating body, and the deformation of the friction member 12 is small. The reinforcing agent is preferably a fibrous substance. Examples of the reinforcing agent include aromatic polyamide fibers, acrylic fibers, and carbon fibers. One or more of these substances are selected for use as a reinforcing agent. In order to achieve the shape maintenance and braking performance of the friction member 12 at the same time, the mass ratio of the reinforcing agent in the friction member 12 is preferably 3% to 7%. For the same reason, the volume ratio of the reinforcing agent in the friction member 12 is preferably 5% to 15%. The average diameter of the fibers used as the reinforcing agent is preferably 1 μm or more and 10 μm or less. The average length of the fibers is preferably 0.5 mm to 3 mm.

The friction member 12 further contains a volume modifier. The volume adjusting agent is used to adjust the volume of the friction member 12. By adding the volume modifier, the volume of the friction member 12 and the size of the friction surface 12A can be adjusted. Examples of the volume modifier include barium sulfate, calcium carbide, and magnesium carbonate. One or more of these substances are selected for use as a volume modifier. In order to achieve the miniaturization and braking performance of the friction member 12 at the same time, the mass ratio of the volume modifier in the friction member 12 is preferably 10% to 50%. For the same reason, the volume ratio of the volume modifier in the friction member 12 is preferably 10% to 50%.

The friction member 12 further contains a rust prevention agent. The rust adhesion preventive is used to suppress the rust factor material from moving to the rotating body. The rust factor material is a material that rusts a rotating body. Examples of the anti-rust adhesion agent include alkaline substances such as slaked lime (calcium hydroxide), magnesium hydroxide, magnesium oxide, and calcium oxide. One or more of these substances are selected for use as a rust adhesion preventing agent. In order to achieve both the braking performance of the friction member 12 and the prevention of rust adhesion, the mass ratio of the rust adhesion preventing agent in the friction member 12 is preferably 0.1% to 2%. For the same reason, it is preferable that the volume ratio of the rust adhesion preventing agent in the friction member 12 is 0.1% or more and 2% or less.

The friction member 12 further contains a sliding noise reduction agent. The sliding noise reducing agent is used to reduce the noise of the contact between the friction member 12 and the rotating body. In particular, the slipping sound reducing agent is used to reduce high-frequency sounds. Examples of slip reduction agents include cashew nut powder and potassium titanate fibers. One or more of these substances are selected for use as a sliding contact reducer. In order to reduce the braking performance and noise of the friction member 12 at the same time, it is preferable that the mass ratio of the sliding noise reduction agent in the friction member 12 is 10% or more and 20% or less. For the same reason, it is preferable that the volume ratio of the sliding contact reducing agent in the friction member 12 is 10% or more and 30% or less.

<Example>
Hereinafter, an example of the friction member 12 will be described in comparison with a reference example.
Table 1 shows the components of the examples and reference examples.

The friction member 12 of the example includes a zinc fiber as a friction agent, a phenolic resin as a binder, a graphite as a friction modifier, and a silicon carbide (abrasive) as an abrasive. SiC) and chromium oxide (Cr ₂ O ₃ ), including aromatic polyamide fibers (aramid fiber) as a reinforcing agent, barium sulfate (BaSO ₄ ) as a volume modifier, and hydroxide as a rust prevention agent Calcium (Ca (OH) ₂ ) includes cashew dust and pottasium titanate fibers, which are slip reducing agents. The mass ratio and volume of these substances with respect to the entire mass of the friction member 12 are shown in Table 1.

The composition of the friction member of the reference example contains the same component as that of the example except that the brass fiber (brass fiber) is included instead of the zinc fiber of the example (refer to Table 1).

The shape characteristics of various substances used in the examples and reference examples are as follows. The zinc fiber had an average diameter of 90 μm and an average length of 1.8 mm (length in the stretched state). The brass fiber has an average diameter of 80 μm and an average length of 1 mm to 2 mm. The average diameter (when mixed) of the phenol resin is 10 μm or more and 50 μm or less. Graphite is scaly, and the average diameter of graphite is 0.1 mm or more and 0.2 mm or less. The average diameter of silicon carbide (SiC) is 10 μm. The average diameter of chromium oxide (Cr ₂ O ₃ ) is 1 μm or more and 2 μm or less. The average diameter of the aromatic polyamide fiber is 5 μm, and the average length is 1 mm or more and 2 mm or less. The average diameter of barium sulfate was 10 μm. The average diameter of calcium hydroxide is 10 μm or more and 50 μm or less. The average diameter of cashew powder is 0.5mm. The potassium titanate fiber has a plate shape, and the average length of the short side is 13 μm, and the average length of the long side is 65 μm or less.

The friction members 12 of Examples and Reference Examples were formed under the following conditions. The above-mentioned substances constituting the friction member 12 are mixed at room temperature, and the mixture is put into a mold to have a predetermined shape. After heat-pressing the mixture, the mixture is heat-treated for a predetermined time. The friction member 12 is formed in the above manner.

The effects of the examples are shown next. The examples and the reference examples were compared with the amount of wear, the coefficient of kinetic friction, the amount of wear of the rotating body, and the thickness of the transfer layer formed on the rotating body. The transfer layer is a layer portion formed by a substance that moves from the friction member 12 to the rotating body when the friction member 12 is brought into contact with the rotating rotating body.

The abrasion amount and the dynamic friction coefficient were measured under the following conditions. The friction area of the friction members 12 of the examples and the reference examples was 382 mm ² . The rotating body was manufactured by Shimano (RT99S). The rotation speed was set to 155 rpm (equivalent to 20 km / h), and the tangential force of the rotating body was 607 N. A traction test was performed for 30 minutes. Traction test in high temperature environment. Specifically, the traction test is performed at a temperature of about 200 ° C, a temperature of about 300 ° C, a temperature of about 400 ° C, and a temperature of about 500 ° C.

As a result of the above tests, the amount of wear of the friction member 12 of the example is less than the amount of wear of the friction member of the reference example at any of the above temperatures. The abrasion amount of the rotating body caused by the braking of the friction member 12 of the embodiment is less than the abrasion amount of the reference example (hereinafter referred to as the effect of reducing the abrasion amount of the rotating body) at temperatures other than 300 ° C. The dynamic friction coefficient of the friction member 12 in the example of the above test is higher than the dynamic friction coefficient of the friction member in the reference example at any of the above temperatures.
The thickness of the transfer layer to the rotating body of the friction member of the reference example becomes thinner at higher temperatures, and the thickness of the transfer layer to the rotating body of the friction member 12 of the comparative example becomes thicker at higher temperatures. At each temperature, the thickness of the transfer layer of the friction member 12 of the example to the rotating body is smaller than the thickness of the transfer layer of the friction member of the reference example to the rotating body. The thickness of the transfer layer of the rotating body was measured by a glow discharge emission analysis device (GD-OES).

(Modification)
The description of the above-mentioned embodiment is an example of the form taken by the friction member and the brake pad of the present invention, and is not intended to limit the form thereof. The friction member and the brake pad of the present invention may take a combination of the modified examples of the above-described embodiments and at least two modified examples that do not contradict each other, for example. In the following modifications, the same reference numerals as those of the embodiment are added to the portions that are common to the embodiment, and descriptions thereof are omitted.

An example of the brake pad 20 having a heat dissipation structure will be described with reference to FIGS. 3 and 4. The brake pad 20 includes a friction member 22 and a back plate 24. The friction member 22 has a structure and composition of the friction member 12 similar to the embodiment. The back plate 24 includes a support portion 26 for supporting the friction member 22 and a heat radiation portion 28 having a heat radiation structure.

The support portion 26 and the heat radiation portion 28 are provided on the main body 30. The main body 30 has a first surface 30A facing the rotating body and a second surface 30B opposite to the first surface 30A in a state where the back plate 24 is mounted on a brake caliper of a human-driven vehicle. The friction member 22 is adhered to the first surface 30A at the support portion 26 of the main body 30. The heat radiating portion 28 is not located on the opposite side of the friction member 22 but is provided on the second surface 30B in the main body 30. In other words, the heat radiating portion 28 is provided on the main body 30 without facing the friction member 22 via the main body 30. The heat radiating portion 28 may be formed integrally with the main body 30 or may be formed as different individuals. In this embodiment, the heat radiating portion 28 is formed integrally with the main body 30.

The heat radiating section 28 has a heat radiating structure as described above. The heat dissipation structure includes a blade 32. A plurality of blades 32 are provided on the second surface 30B of the main body 30. The plurality of blades 32 are provided to extend from the second surface 30B toward the opposite side of the friction member 22. The blades 32 may be formed integrally with the main body 30 or may be formed as different individuals. In this embodiment, the blade 32 is formed integrally with the main body 30. In the case where the blades 32 are formed as different individuals, for example, a hole portion for inserting the blades 32 is provided in the main body 30, and the blades 32 are fixed to the hole portions by a method such as pressing or bonding. A through hole 30C is provided in the main body 30 between the support portion 26 and the heat radiating portion 28 to pass a pin of the brake caliper.

The friction member 12 may be configured as described below. The friction member 12 has a friction surface 12A in contact with the rotating body. The friction member 12 includes zinc fibers, and the first dimension L3 of the friction surface 12A in the first direction D1 parallel to the friction surface 12A is 15 mm or more and 30 mm or less. The second dimension L4 of the friction surface 12A in the second direction D2 parallel to the friction surface 12A and perpendicular to the first direction D1 is 10 mm or more and 20 mm or less.

In the above embodiment, the friction surface 12A may be divided into a plurality of surfaces. For example, the friction surface 12A is divided into two. A gap is formed between the two friction surfaces constituting the friction surface 12A. In this case, the friction area is calculated from the sum of the areas of the two friction surfaces. The first dimension L3 and the second dimension L4 of the friction member 12 are set for an appearance in which a plurality of friction surfaces are regarded as continuous surfaces.

In the embodiment described above, the friction member 12 may not include a friction material other than zinc fiber, but may include a friction material other than zinc fiber. For example, the friction member 12 may further include brass fibers in addition to zinc fibers. In this case, it is preferable that the volume ratio of zinc fibers is larger than that of brass fibers.

The human-powered driving vehicle to which the brake pads 10 and 20 are mounted according to the embodiment is not limited. Human-powered vehicles include road bikes, mountain bikes, off-road bikes, city bikes, cargo bikes, lying bikes, and scooters.

D1‧‧‧1st direction

D2‧‧‧ 2nd direction

D3‧‧‧3rd direction

L3‧‧‧1st size

L4‧‧‧ 2nd size

10, 20‧‧‧ Brake Pads

12, 22‧‧‧ Friction members

12A‧‧‧ friction surface

14, 24‧‧‧ back plate

26‧‧‧ support

28‧‧‧Cooling Department

32‧‧‧ Blade

Figure 1 is a top view of the brake pads.

Figure 2 is a side view of the brake pads.

FIG. 3 is a perspective view of a modified example of the brake pad.

FIG. 4 is a perspective view of a modified example of the brake pad viewed from a viewing angle different from that of FIG. 3.

Claims (23)

A friction member having a friction surface in contact with a rotating body, the friction member includes zinc fibers, and an area of the friction surface is 150 mm ² or more and 600 mm ² or less. For example, in the friction member according to claim 1, the first dimension of the friction surface in the first direction parallel to the friction surface is 15 mm or more and 30 mm or less. For example, in the friction member according to the second claim, the second dimension of the friction surface in the second direction that is parallel to the friction surface and perpendicular to the first direction is 10 mm or more and 20 mm or less. A friction member having a friction surface in contact with a rotating body, The friction member includes zinc fiber, A first dimension of the friction surface in a first direction parallel to the friction surface is 15 mm or more and 30 mm or less; A second dimension of the friction surface in a second direction that is parallel to the friction surface and perpendicular to the first direction is 10 mm or more and 20 mm or less. For example, the friction member according to item 3 or 4 of the patent application scope, wherein the second size is smaller than the first size. The friction member according to any one of claims 2 to 4, wherein the friction member is bent in the first direction and has unevenness. In the friction member according to any one of claims 1 to 4, the size of the friction member in a third direction perpendicular to the friction surface is 1.5 mm or more and 5 mm or less. The friction member according to any one of claims 1 to 4, further comprising a binding agent. The friction member according to any one of claims 1 to 4, further comprising a friction modifier. The friction member according to any one of claims 1 to 4, further comprising an abrasive. The friction member according to any one of claims 1 to 4, further comprising a reinforcing agent. The friction member according to any one of claims 1 to 4, further comprising a volume modifier. The friction member according to any one of claims 1 to 4, further comprising a rust adhesion preventing agent. The friction member according to any one of claims 1 to 4, further comprising a sliding noise reducing agent. The friction member according to any one of claims 1 to 4, wherein the average diameter of the zinc fiber is 40 μm or more and 140 μm or less. In the friction member according to any one of claims 1 to 4, the average length of the zinc fiber is 0.8 mm or more and 2.8 mm or less. In the friction member according to any one of claims 1 to 4, the mass ratio of the zinc fiber in the friction member is 15% or more and 40% or less. In the friction member according to any one of claims 1 to 4, the volume ratio of the zinc fiber of the friction member is 5% or more and 30% or less. A brake pad containing: Friction members in any one of the scope of patent applications 1 to 18, And a back plate for supporting the friction member. For example, the brake pad of claim 19, wherein the friction member is adhered to the back plate. For example, the brake pad of the 19th or 20th in the scope of patent application, wherein the back plate is formed of any one of an iron alloy, titanium, a titanium alloy, and an aluminum alloy. For example, the brake pad of claim 19 or 20, wherein the back plate includes a support portion for supporting the friction member and a heat radiation portion having a heat radiation structure. For example, the brake pad of claim 22, wherein the heat dissipation structure includes a blade.