JP6899134B2 - Brake shoes for railroad cars - Google Patents

Description

The present invention relates to a brake shoe for a railway vehicle. In particular, it relates to a brake shoe for railway vehicles that easily removes deposits such as dust.

Conventionally, there are two types of friction brake mechanisms for railway vehicles, the tread system and the disc system, and the tread system is often used for conventional lines. In the tread method, a braking force is generated by pressing the friction surface of the brake shoe against the wheel tread of the railway wheel. Some of the brake shoes are made of a sliding material made of a metal material such as a cast iron brake shoe or a sintered brake shoe. However, the cast iron brake shoe has a short life of the brake shoe and is frequently replaced, and is sintered. Brake shoes have disadvantages such as being expensive, so synthetic resin, which is a relatively long-life and inexpensive material, is used as a binder, and friction adjusting materials such as carbon powder and iron powder are mixed with this. A synthetic brake shoe having a friction body formed by the above is used.

Patent Document 1 describes a metal block insertion type synthetic brake shoe. Patent Documents 2 to 4 propose a brake shoe having a groove in the central width direction. In Patent Document 5, the applicant has proposed a brake shoe having inclined surfaces on both ends of the brake shoe body and both sides of the groove.

Japanese Unexamined Patent Publication No. 2000-23589 Japanese Patent No. 2835151 Japanese Patent No. 3185139 Japanese Unexamined Patent Publication No. 7-133833 Japanese Unexamined Patent Publication No. 2016-118247

However, conventional brake shoes for rolling stock are flush in the width direction (direction orthogonal to the traveling direction of the vehicle), and deposits such as water, snow, and grease easily enter between the brake shoes and the wheel treads. There was a problem. If deposits such as water, snow, and grease get between the brake shoes and the tread of the vehicle, the braking performance will deteriorate. Further, it is conceivable that the front surface of the brake shoe is an inclined surface, but if the entire front surface is an inclined surface, the strength of the tip portion is lowered and a problem of durability occurs. Furthermore, in order to allow snow, water, oil, etc. to flow to the side of the brake shoe body (shoe), dust mixed with dust, wear powder, oil, grease, etc. tends to stick to both ends of the brake shoe body, and this is to be removed. Cleaning is required, but it is said that the brake shoes of Patent Document 5 are difficult to remove when the brake shoes main body (shoe) becomes worn because the base metal (back plate) portion of the partially inclined surfaces 16a and 16b becomes an obstacle. There was a problem and improvement was required.

In order to solve the above-mentioned conventional problems, the present invention provides a railroad vehicle brake shoe that is easy to remove even if dust mixed with dust, abrasion powder, oil, grease, etc. sticks to it.

The brake shoe for a railroad vehicle of the present invention is a brake shoe for sliding contact with the wheel tread of a railroad vehicle to apply a brake to the wheel, and a groove is formed in the width direction of the central portion of the brake shoe main body. Both ends of the brake shoe body and both sides of the groove have a surface in a direction orthogonal to the traveling direction or the reverse direction of the vehicle and an inclined surface inclined to the non-flange side of the wheel, and both ends of the brake shoe body. The inclined surface is characterized in that it extends to a base metal integrated with the brake shoe main body.

The railcar brake shoe of the present invention has a surface and an inclined surface in a direction orthogonal to the traveling direction or a retrograde direction of the vehicle of the brake shoe main body, and a surface and an inclination in a direction orthogonal to the traveling direction or the retrograde direction of the base metal vehicle. Since the surfaces are flush with each other, it is possible to provide a brake shoe for railroad vehicles that is easy to clean in order to remove dust mixed with dust, abrasion powder, oil, grease, etc. even if it sticks to the surface.

FIG. 1 is a perspective view of a brake shoe according to an embodiment of the present invention as viewed from a wheel sliding contact surface. FIG. 2 is a side view of the side surface of the brake shoe as viewed from the non-flange surface side. FIG. 3 is a plan view of the brake shoe as seen from the wheel sliding contact surface. FIG. 4 is an explanatory diagram showing the water removal direction of the brake shoe in rainy weather. FIG. 5A is an explanatory diagram showing a state in which deposits such as grease of the brake shoe adhere, and FIG. 5B is an explanatory diagram showing a state in which snow is removed during the same snowfall. FIG. 6 is a perspective view seen from the wheel sliding contact surface of the conventional brake shoe. FIG. 7A is a rear view of the brake shoe according to the embodiment of the present invention, and FIG. 7B is a rear view of the conventional brake shoe.

The brake shoe of the present invention is a brake shoe for braking the wheels by sliding on the treads of the wheels of a railway vehicle. The material of this brake shoe is not particularly limited, and any material can be used. For example, a synthetic brake shoe having a friction body formed by using a synthetic resin such as a phenol resin as a binder and mixing a friction adjusting material such as carbon powder or iron powder with the binder can be used. Further, a hybrid type brake shoe in which a metal block or a ceramic block is inserted may be used.

On both ends and both sides of the groove of the brake shoe of the present invention, a surface in a direction orthogonal to the traveling direction or the retrograde direction of the vehicle (hereinafter, also referred to as an "orthogonal surface") and a surface inclined toward the non-flange side of the wheel (hereinafter, also referred to as "orthogonal surface") Hereinafter, it is also referred to as an “inclined surface”), and the inclined surfaces at both ends of the brake shoe main body extend to a base metal (back plate) integrated with the brake shoe main body. That is, the base metal (back plate) is also an inclined surface. Preferably, the inclined surfaces at both ends of the brake shoe body and the inclined surfaces of the base metal (back plate) are flush with each other. As a result, even if dust mixed with dust, abrasion powder, oil, grease, etc. sticks, it can be easily removed.

A groove is formed in the width direction of the central portion of the brake shoe. If there is a groove, stress concentration can be prevented, and bending can be provided to prevent damage.

It is preferable that the sliding contact surfaces of the brake shoes have a symmetrical relationship with the center line of the groove portion as the center. Since the railroad vehicle travels in both directions, the same effect can be obtained regardless of which direction the railroad vehicle travels as long as it is symmetrical.

The length of the orthogonal plane is preferably 40% or more and 90% or less, and more preferably 45% or more and 75% or less of the total width of the brake shoes on the sliding contact surface. Within the above range, the effect of the present invention can be further enhanced.

The angle (θ1) of the inclined surface from the orthogonal planes at both ends of the brake shoe is 10 to 60 °, and the angle (θ2) of the inclined surface from the orthogonal planes on both sides of the groove portion is 10 to 40 °, θ1>. The relationship is preferably θ2. A more preferable θ1 is 20 to 50 °, and a more preferably 30 to 40 °. θ2 is more preferably 15 to 35 °, more preferably 20 to 30 °. Within the above range, substances such as water, snow, and grease can be easily removed more efficiently. Further, θ1> θ2 is preferable because more substances such as water, snow, and grease hit the orthogonal plane of the brake shoe than in the groove, and this is eliminated.

The distance between the orthogonal surfaces on both sides of the groove is preferably 10 to 25 mm, more preferably 15 to 20 mm when viewed from the wheel sliding contact surface. In this way, the sliding area is reduced by inserting the inclined surface, but the width of the groove can be narrowed and the sliding area can be increased by that amount, and the sliding area is almost the same as that without the inclined surface. Can be secured. As a result, the effect of the brake during drying can be maintained almost the same as that without an inclined surface.

It is preferable that slits and / or ribs are formed on the side surface of the brake shoe on the non-flange side in a direction away from the wheel tread. By doing so, it is possible to reduce the proportion of substances such as water, snow, and grease that are excluded from the inclined surface of the brake shoe and enter the groove again.

It is preferable that at least both ends of the brake shoe body are coated with a water-repellent / oil-repellent paint. It is more preferable that the side portion, both end portions, and both side portions of the groove portion of the brake shoe main body are coated with a water-repellent / oil-repellent paint. As a result, dust is less likely to accumulate, and even if it accumulates, it can be easily removed. As the water-repellent / oil-repellent paint, for example, a commercially available fluorine-based paint can be used.

This will be described below with reference to the drawings. In the drawings below, the same reference numerals indicate the same parts or the same objects. FIG. 1 is a perspective view of the brake shoe 10 according to an embodiment of the present invention as viewed from the wheel sliding contact surfaces 2a and 2b. The brake shoe 10 is composed of a brake shoe main body 1, a base metal (back plate) 8, and a mounting plate 9. The brake shoe main body 1 has orthogonal surfaces 3a and 3b and inclined surfaces 4a and 4b at both ends, and the groove portion 5 also has orthogonal surfaces 6a and 6b and inclined surfaces 7a and 7b. The inclined surfaces 4a and 4b at both ends of the brake shoe body extend to the base metal (back plate) 8 integrated with the brake shoe body. That is, the base metal (back plate) 8 is also an inclined surface, and the inclined surfaces 4a and 4b at both ends of the brake shoe main body are flush with the inclined surfaces of the base metal (back plate).
Taking the example of driving in the vehicle traveling direction, substances such as water, snow, and grease first hit the orthogonal surface 3a, and then are excluded to the non-flange side on the inclined surface 4a, and some of them fall off as they are. Since a part of the brake shoe 10 enters the groove 5 along the non-flange side side surface, this is excluded from the inclined surface 7b. In the retrograde direction, the opposite inclined surface exerts the same effect. Further, even if dust mixed with dust, abrasion powder, oil, grease and the like sticks to the orthogonal surfaces 3a and 3b and the inclined surfaces 4a and 4b at both ends of the brake shoe main body, it is easy to remove.

FIG. 2 is a side view seen from the non-flange surface side of the side surface of the brake shoe 10, and FIG. 3 is a plan view seen from the wheel sliding contact surface of the brake shoe 10. As is clear from FIG. 3, the wheel sliding contact surfaces 2a and 2b have a deformed hexagonal shape, and the inclination angles (θ1) of the inclined surfaces 4a and 4b at both ends are the inclined angles 7a and 7b of the inclined surfaces 7a and 7b of the groove portion 5. The angle is higher than (θ2). This is because the amount of substances such as water, snow, and grease that hit both ends is relatively large, so the amount of exclusion is also large. Further, the width of the groove portion 5 is 10 to 25 mm when viewed from the wheel sliding contact surface in the examples of FIGS. 2 to 3. As a result, the sliding area is expanded. 11 in FIG. 2 is a receipt. The alternate long and short dash line 100 in FIG. 3 is a symmetrical line.

FIG. 4 is an explanatory diagram showing the water removal direction of the brake shoe in rainy weather. FIG. 4 was created by observing a photograph taken with a high-speed camera of the behavior of water in a running test. First, the water 12a corresponds to the orthogonal surface 3a at the tip and is excluded from the inclined surface 4a (water 12b), flows along the non-flange side side surface and enters the groove 5 (water 12c), and this water is excluded from the inclined surface 7b. (Water 12d) flows down again along the non-flange side side surface (water 12e).

FIG. 5A is an explanatory diagram showing a state in which deposits such as grease of the brake shoe adhere, and FIG. 5B is an explanatory diagram showing a state in which snow is removed during the same snowfall. Ordinary railroad vehicles are driven while supplying grease or the like to the wheels. This is to reduce the noise and friction between the rail and the wheel. Therefore, grease or the like tends to adhere to the wheel tread. In the brake shoe of the present invention, even if grease or the like 14 adheres to the wheel tread surface 13a, it is captured by the orthogonal surface 3a and the inclined surface 4a as shown in FIG. 5A. In addition, as shown in FIG. 5B, even if snow adheres during snowfall, it is excluded from the inclined surface 4a. Reference numeral 13b is a flange of the wheel.

On the other hand, in the conventional brake shoe 17, as shown in FIG. 6, when the base metal (back plate) portion of the partially inclined surfaces 16a and 16b becomes an obstacle and the brake shoe body (shoe) is worn. There is a problem that it is difficult to remove.

FIG. 7A is a rear view of the brake shoe according to the embodiment of the present invention, and FIG. 7B is a rear view of the conventional brake shoe. In the brake shoe according to the embodiment of the present invention, the lower right and lower left portions of the base metal (back plate) 8 (the portions corresponding to the inclined surfaces 4a and 4b at both ends of the brake shoe body) are cut, but conventionally The lower right and lower left parts of the brake shoe (the parts corresponding to the partial system slopes 16a and 16b of the brake shoe body) are not cut.

The present invention will be described below with reference to examples. The present invention is not construed as being limited to the following examples.

(Example 1)
The brake shoes shown in FIGS. 1 to 3 were manufactured. The overall size is a straight line length of 350 mm and a width of 79 mm when viewed from the side surface. The material used was a synthetic resin such as phenol resin, which is the same as the conventional product, and was molded by mixing it with a friction adjusting material such as carbon powder and iron powder. When a vehicle driving test was conducted using this brake shoe, dust mixed with dust, abrasion powder, oil, grease, etc. adhered to the orthogonal surfaces 3a and 3b and the inclined surfaces 4a and 4b at both ends of the brake shoe body. However, it was easy to remove and easy to clean.

(Comparative Example 1)
When a vehicle driving test was conducted during snowfall using the conventional brake shoe shown in FIG. 6, the base metal (back plate) portion of the partially inclined surfaces 16a and 16b became an obstacle, and the brake shoe body (shoe) was worn. It was difficult to remove it when it was done, and it took time to clean it.

(Example 2)
A commercially available fluorine-based water- and oil-repellent paint is applied to the orthogonal surfaces 3a and 3b and the inclined surfaces 4a and 4b at both ends of the brake shoe body of Example 1 with a brush, and after drying, the temperature is 150 ° C. for 3 minutes. Was heat-cured and coated. When a vehicle driving test was conducted using this brake shoe, dust mixed with dust, abrasion powder, oil, grease, etc. adhered to the orthogonal surfaces 3a and 3b and the inclined surfaces 4a and 4b at both ends of the brake shoe body. However, it was easier to remove and easier to clean than the brake shoes of the examples.

The brake shoes for railway vehicles of the present invention are suitable for high-speed railways and ordinary railway vehicles because they are easy to remove even if dust mixed with dust, abrasion powder, oil, grease, etc. sticks to them and are easy to clean. It is also suitable for subway cars and tram cars that are scheduled to run on the ground.

1,17 Brake shoe body 2a, 2b Wheel sliding contact surface 3a, 3b, 6a, 6b Orthogonal surface 4a, 4b, 7a, 7b Inclined surface 5 Groove 8 base metal (back plate)
9 Mounting plate 10 Brake shoes 11 Receiving 12a to 12e Water flow direction 13a Wheel tread 13b Wheel flange 14 Gris, etc. 15 Snow 16a, 16b Partially inclined surface

Claims (5)

A brake shoe for braking the wheels by sliding on the treads of the wheels of a railway vehicle.
A groove is formed in the width direction of the central part of the brake shoe body,
A base metal is integrated on the back of the brake shoe body.
Both ends of the brake shoe body, the base metal , and both sides of the groove have a surface in a direction orthogonal to the traveling direction or the retrograde direction of the vehicle and an inclined surface inclined to the non-flange side of the wheel.
A brake shoe for a railroad vehicle in which the orthogonal surface and the inclined surface of the brake shoe main body and the orthogonal surface and the inclined surface of the base metal are flush with each other. The brake shoe for a railway vehicle according to claim 1, wherein the wheel sliding contact surface of the brake shoe has a symmetrical relationship with the center line of the groove portion as the center. The length of the side of the surface in the orthogonal direction when viewed from the wheel sliding contact surface of the brake shoe is 40% or more and 90% or less of the width of the portion of the brake shoe without the inclined surface. Brake shoes for railroad vehicles according to 2. The angle (θ1) of the inclined surface from the plane in the orthogonal direction is 10 to 60 °, the angle (θ2) of the inclined surface from the plane in the orthogonal direction on both sides of the groove is 10 to 40 °, and θ1> The brake shoe for a railroad vehicle according to any one of claims 1 to 3, which is related to θ2. The brake shoe for a railway vehicle according to any one of claims 1 to 4, wherein the distance between the surfaces in the orthogonal directions on both sides of the groove is 10 to 25 mm when viewed from the wheel sliding contact surface.

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