JPH0891180A - Vehicular disc brake device - Google Patents

Abstract

PURPOSE: To provide a vehicular disc brake device by which a vehicle traveling at high speed can be stopped without damaging pads of brake blocks by a fire. CONSTITUTION: At least two or more brake blocks 7 are installed on a holding metal fitting 4a, and brake levers 2 and 22 are installed in a central part of the holding metal fitting 4a. A driving mechanism composed of a cylinder 5 and a return spring 6 is arranged on the other end of the brake levers 2 and 22. When the cylinder 5 is driven, the brake levers 2 and 22 rotate with brake lever fulcrum parts 2d and 22d as the axis, and the brake blocks 7 are brought into pressure contact with a disc surface 9b of a wheel 9, and braking force is applied to the wheel. Since the brake blocks 7 are arranged by two or more pieces, a quantity of braking heat borne by a pad of a single braking block can be reduced, and damage of the pad by a fire can be reduced. Since the brake blocks 7 are installed so as to be movable to the brake levers 2 and 22, the brake blocks can be contacted under uniform pressure with the disc surface of the wheel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle disc brake device, and more particularly, the present invention relates to a vehicle disc brake device suitable for application to high-speed railway vehicles and automobiles.

[0002]

2. Description of the Related Art FIG. 6 is a perspective view of a conventional disc brake device mechanism for a high-speed railway vehicle, FIG. 7 is a perspective view of a conventional brake shoe attachment device, and FIG. 8 is a relationship between a braking force and an adhesive force between a wheel and a rail. FIG. 9 is a diagram showing a conventional disc brake device for a high-speed railway vehicle with reference to FIGS. 6 to 8.

In FIG. 6, reference numeral 9 is a wheel, 9a is a wheel tread, 9b is a disk surface, 10 is an axle, and 11 is a rail, which are mounted on a bogie frame 8 on a disk brake mount 1.
The brake levers 2 and 22 are the brake lever fulcrums 2.
d and 22d, and the brake lever fulcrum 2
d and 22d are supported by the brake lever supporting point support fitting 3 by the brake lever receiving pin 3a.

On the other hand, the wheels 9 of the brake levers 2 and 22
The connection fitting 2a is provided at one end on the side, and the connection fitting 2a
The holding metal fitting 4 is attached to the. Further, one brake shoe 7 is attached to the holding metal fitting 4 per one side of the disc. A brake cylinder 5 is provided at the other ends of the brake levers 2 and 22, and a return spring 6 is provided between the brake cylinder 5 and the brake lever fulcrums 2d and 22d.

In the figure, when the brake cylinder 5 is operated, the pressing force P of the brake shoe 7 against the disk surface 9b is set to a predetermined value by the force Pc of the cylinder 5 due to the lever action of the fulcrums 2d and 22d of the brake lever. It is amplified and acts on the disk surface with a braking force of 2 kPr. Note that k is a coefficient of friction between the disk surface 9b and the brake shoe 7. However, the effective braking force is converted into the braking force on the tread 9a of the wheel, and this is Q = μ shown in FIG.
・ W will be challenged. Here, Q is the adhesion of the wheel tread 9a to the rail 11, w is the equivalent weight on the brake shaft, and μ is the coefficient of friction between the wheel and the rail 11.

FIG. 7 is a diagram showing the construction of the brake shoe attachment device in FIG. 6, and the attachment of the brake shoe 7 will be described with reference to FIG. The connecting fitting 2a provided at one end of the brake levers 2, 22 on the wheel side is provided with a round hole 2b for mounting the brake shoe head 41, and the brake shoe head 41 has a round side surface on the connecting fitting 2a side. The rod 41a is embedded. The center of the mounting round hole 2b is located inside the side surface of the connecting fitting 2a so that the round bar of the brake shoe head 41 does not come off.

A gap G is formed between the side surface of the connecting metal fitting 2a and the side surface of the brake shoe head 41 so that the brake shoe head 41 can freely swing at a predetermined angle with respect to the connecting metal fitting 2a. It is structured so that it can be exercised. Further, the brake shoe head 41 has another parallel end surface portion provided with a brake shoe attachment rimimulation 41b, and the brake shoe 7 is provided with an rimimulation insertion projection 7a for inserting into the brake limb 41b. Further, a pad 7b is attached to the other end side surface of the brake shoe 7.

The above-mentioned components are connected and attached as shown in FIG. 7, a clearance G is secured so as not to hinder the swing of the brake shoe head 41, and the upper and lower end face portions are tightened by the pressing plate 42. Then, the connecting bracket 2a is attached to the brake levers 2 and 22 shown in FIG. 6 to form a disc brake device.
As described above, the conventional disc brake device has a configuration in which a pair of brake shoe mounting devices is provided for each disc surface of the wheel, and one brake shoe is attached to the brake shoe mounting device.

[0009]

When a vehicle operating at a high speed is in normal operation, the brake is applied when the vehicle is operating at a high speed. It is operated and stopped. However, in the case where a vehicle that is operating at high speed is to be urgently stopped at a higher speed than when the vehicle is operating at a high speed in a state where the electric system has failed or power transmission has been stopped due to an earthquake or disaster, it must be stopped only by the force of air or a hydraulic cylinder.

The present inventor has conducted a test with a high-speed brake performance test apparatus having a maximum speed of 500 km / h, assuming the above-mentioned emergency, and as a result, the disk surface of the wheel is driven by the force of air or hydraulic cylinder at a higher speed. It was confirmed that in the conventional disc brake device, when the braking force was applied to the pad 7, the pad 7b of the brake shoe generated heat and melted in a short time. This is because the kinetic energy of the vehicle is mainly stored as heat by the disc and the pad of the brake shoe.As a method of increasing the heat capacity, the disc can increase its thickness and radius, but It may not be possible to easily increase the thickness of the pad of the machete from the mounting space.

The conventional disc brake device has the above-mentioned problems, and as the vehicle speed increases, it is an urgent task to improve the material of the brake pad and to develop a high-speed disc brake device and a brake shoe mounting device. Is becoming. The present invention has been made to solve the above-mentioned problems of the prior art, and a first object of the present invention is to provide a vehicle disk brake capable of emergency stopping a vehicle running at high speed from a high speed. It is to provide a device.

A second object of the present invention is to dispose a plurality of pairs of brake shoes on both sides of a brake lever so that when the vehicle is stopped at high speed in an emergency, the pad does not burn and the vehicle runs out of control. It is an object of the present invention to provide a disc brake device for a vehicle capable of preventing the above. A third object of the present invention is to provide a disc brake device for a vehicle capable of uniformly applying pressure to the entire surface of a brake shoe without causing the friction pad of the brake shoe to hit one side.

A fourth object of the present invention is to provide a vehicle disc brake device which is easy to assemble and has high reliability.

[0014]

In order to solve the above-mentioned problems, the invention of claim 1 of the present invention is directed to a brake shoe which abuts on both side surfaces of a wheel, a coupling fitting for driving the brake shoe, and this coupling. In a vehicle disc brake device including a drive mechanism mounted between metal fittings, at least two brake shoes that come into contact with both side surfaces of the wheel are provided on one surface.

According to a second aspect of the present invention, in the first aspect of the invention, the brake shoe having two or more brakes provided on one side is driven by a single drive mechanism. According to a third aspect of the present invention, in the first or second aspect of the present invention, the connecting metal fitting comprises a holding metal fitting to which the brake shoe is mounted, and a brake lever engaging with the holding metal fitting. One end of the brake lever is attached to the central portion of the brake lever, a plurality of pairs of brake shoes are arranged on both sides of the holding metal fitting, and a drive mechanism is provided at the other end of the brake lever.

According to the invention of claim 4 of the present invention,
Alternatively, in the invention of claim 3, the brake shoe is attached to the brake lever so as to be movable with a degree of freedom. According to a fifth aspect of the present invention, in the invention according to the first, second, third or fourth aspect, the drive mechanism is composed of a return spring and a cylinder.

According to the invention of claim 6 of the present invention,
In the invention of 2, 3, 4 or claim 5, the brake shoe is
It is arranged on the circumference of the disk surface. According to a seventh aspect of the present invention, in the first, second, third, fourth or fifth aspect of the invention, the brake shoe is arranged in the radial direction of the disk surface.

[0018]

According to the first aspect of the present invention, there is provided a brake shoe which comes into contact with both side surfaces of a wheel, a coupling fitting for driving the brake shoe, and a drive mechanism mounted between the coupling fittings. In the vehicle disc brake device, since at least two or more brakes that come into contact with the both side surfaces of the wheel are provided, when braking is applied, the pressure and braking heat amount shared by each brake pad are reduced. be able to. Therefore, it is possible to reduce the burnout of the pad when stopping the vehicle running at high speed and prevent the vehicle from running out of control.

In the invention of claim 2 of the present invention, in the invention of claim 1, since the brake shoe is driven by one drive mechanism, the drive mechanism of the brake device can be simplified. . According to a third aspect of the present invention, in the first or second aspect of the present invention, the connecting fitting is composed of a holding fitting to which the brake shoe is mounted, and a brake lever that engages with the holding fitting, One end of the brake lever is attached to the central part of the metal fitting, the same number of brake shoes are arranged on both sides of the holding metal fittings, and the drive mechanism is provided at the other end of the brake lever. Can be operated in a balanced manner.

According to a fourth aspect of the present invention, in the first, second or third aspect of the invention, the brake shoe is attached to the brake lever so as to move with a degree of freedom. Can be brought into contact with the disk surface of the wheel with a uniform pressure, and uneven contact can be prevented. In the invention of claim 5 of the present invention, in the invention of claim 1, 2, 3 or 4, since the drive mechanism is composed of the return spring and the cylinder, the brake device can be driven by a simple mechanism. it can.

According to a sixth aspect of the present invention, in the invention of the first, second, third, fourth or fifth aspect, since the brake shoe is arranged on the circumference of the disk surface, a plurality of brake shoes are provided. The frictional force applied to can be made substantially equal. In the invention of claim 7 of the present invention, in the invention of claim 1, 2, 3, 4 or 5, the brake shoe is arranged in the radial direction of the disk surface, so that the holding metal fitting for mounting the brake shoe is provided. The structure of can be simplified.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing the overall construction of a vehicle brake system according to a first embodiment of the present invention. An embodiment of the present invention will be described with reference to the drawing. In the present embodiment, as shown in FIG. 1, a brake shoe 7 that abuts on both side surfaces of a wheel 9, a connecting bracket X that drives the brake shoe 7 respectively, and a drive installed between the connecting bracket X. In the vehicle disc brake device including the mechanism Y, the brake element 7 that contacts both side surfaces of the wheel 9
Are provided on at least one surface (two sets in the same figure), and the brake shoe 7 is configured to be driven by one drive mechanism Y.

In FIG. 1, 9 is a wheel, 9a is a wheel tread, 9b is a disk surface, 10 is an axle, and 11 is a rail. Like the conventional example shown in FIG. 6, the disk mounted on the bogie frame 8 is shown. Brake lever 1 and brake lever 2 and 22
Are held by the brake lever fulcrum portions 2d and 22d, and the brake lever fulcrum portions 2d and 22d are supported by the brake lever fulcrum portion support metal 3 by the brake lever receiving pins 3a.

The connecting fitting X is a holding fitting 4a for mounting the brake shoe 7 and a brake lever 2 for engaging with the holding fitting 4a.
One end of the brake lever 2 is attached to the central portion 4b of the holding metal fitting 4a. The same number of brake shoes 7 are arranged on each side of the brake lever 2, and the drive mechanism Y including the return spring 6 and the cylinder 5 is provided at the other end of the brake lever 2.

Further, a holding metal fitting 4 in which a plurality of brake shoes 7 are attached to a metal fitting 2a provided at one end of the brake lever 2
a is connected. Further, in the figure, the radius r from the center of the wheel in the circumferential direction of the disk surface 9b of the wheel 9 of radius R
The brake shoe 7 is at a position of α ° at the position of 2
The brake shoe 7 is attached individually, and is connected to the metal fitting 2a through the holding metal fitting 4a.

As will be described later, a brake shoe fitting having a plurality of brake shoes 7 attached in the radial direction of the disk surface can be provided. As described above, by using a plurality of brake shoes of the disc brake device, the pressing force to the wheel disc surface shared by each brake shoe is reduced as compared with the conventional case, and the shared braking heat amount can be reduced. .

Next, the specific construction of the brake shoe attachment device in the above-mentioned vehicle disc brake device will be described.
2, FIG. 3, FIG. 4, and FIG. 5 are views showing the first to fourth embodiments of the brake shoe mounting device, and FIG. 2 is a brake shoe mounting when the brake shoe is mounted as in FIG. 3 is an exploded perspective view of the device, FIG. 3 is an exploded perspective view of the brake shoe mounting device when the brake shoe is arranged in the radial direction of the wheel, and FIG. 4 is an exploded perspective view showing a modified example of the brake shoe mounting device of FIG. 5 shows an exploded perspective view of another modified example of the brake shoe attachment device.

In FIG. 2, reference numeral 2a is a rectangular parallelepiped metal fitting provided at one end of the brake lever 2.
On the opposite side where the
Is provided, and the center of the round hole 2b is located inside the side surface of the metal fitting 2a. 42a is a mountain-shaped intermediate head,
It has two sides having OA and OB axes with an angle of θ ° with respect to the axle center direction OC with the center O as a base point, and the end face 42 on the axis is formed.
Each d forms a surface perpendicular to the above axis. Also,
The points A and B are the center of attachment of the brake shoe 7, which will be described later.

A round bar 42b is embedded on the central surface of the intermediate head 42a on the lines A and B. And the round bar 42b
Is centered outside the above surface, and the round bar 42b is fitted into the round hole 2b of the metal fitting 2a. Also, the middle head 42
The surface opposite to the surface in which the round bar 42b of a is embedded is the round bar 4
It is formed on a flat surface parallel to the axis of 2b and parallel to the disk surface 9b of the wheel 9, and has a brake shoe head 41 and a protrusion 42e for pressing the brake shoe 7, which will be described later.

AO, B are formed on the side surface of the intermediate head 42a.
Round holes 42c are provided in the axial direction of O. These round holes 42c
Is formed so as to be inside the surface.
Reference numeral 41 denotes a brake shoe head, and the brake shoe head 41 has a rectangular parallelepiped shape, and a round bar 41a which fits into the round hole 42c of the intermediate head 42a is embedded in one surface thereof, and the center of the round bar 41a is It is located outside the mounting surface. Further, on the surface on the opposite side of the brake shoe head 41, there is provided an arimizo 41b into which a brake shoe 7 described later is fitted.

Reference numeral 7 is a brake shoe. The brake shoe 7 is provided with a grooved projection 7a on one surface thereof, and a pad 7b of a friction plate is attached to the opposite surface thereof. The above components are assembled as follows to form a brake shoe attachment device. First, the round bar 42b of the intermediate head 42a is attached to the round hole 2b of the metal fitting 2a. Next, the round bar 41a of the brake shoe head 41 is attached to the round hole 42c of the intermediate head 42a, and the limb projection 7a of the brake shoe 7 is attached and fixed to the rimlet 41b of the brake shoe head. Then, in order to support each component, both end surface portions 4 of the intermediate head 42a are
The pressing plate 44 is fixed to 2d, and the pressing plate 43 is fixed to both end surfaces 2c of the metal fitting 2a.

Here, gaps G and G1 are formed between the brake shoe head 41 and the intermediate head 42a, and between the side surface of the brake shoe head 41 and the pressing plate 44, and the metal fitting 2a and the intermediate portion are formed. Gaps G, G are formed between the heads 42a and between the end surfaces 2c of the metal fitting 2a and the pressing plate 43, respectively.
1 is formed, the brake head 41 can be rotated by a predetermined angle with respect to the intermediate head 42a, and the intermediate head 42a can be rotated by a predetermined angle with respect to the metal fitting 2a.

When the brake shoe mounting device constructed as described above is incorporated into the brake device shown in FIG. 1 and the cylinder 5 is driven, the brake lever 2 rotates about the fulcrum 2d, and the brake shoe 7 rotates the wheels 9. Is pressed against the disk surface 9b. Here, as described above, since the intermediate head 42a can be rotated by a predetermined angle with respect to the metal fitting 2a, and the brake head 41 can be rotated by a predetermined angle with respect to the intermediate head 42a, The pad 7b of the brake shoe 7 conforms to the disk surface 9b of the wheel 9 and press-contacts with it, so that pressure can be uniformly applied to the entire area of the pad 7b.

Further, since the pads 7b are arranged on the same circumference of the wheel 9 and the pads 7b are attached at symmetrical positions with respect to the brake lever 2, the pressures applied by the two pads 7b are balanced. Can be made. Further, the round rods 42b and 41a are fitted into the round holes 2b and 42c, and the limbo insertion projection 7a is fitted into the rim eliminator 41b, so that both end faces 42d of the intermediate head 42a and the metal fitting 2a are fitted.
Since the pressing plates 43 and 44 are attached to both end surfaces 2c of the brake shoe to assemble the brake shoe attachment device, the device can be easily assembled and structurally strong. The reliability can be improved.

FIG. 3 is an exploded perspective view of the brake shoe mounting device when the brake shoe is arranged in the radial direction of the wheel, and a second embodiment of the brake shoe mounting device of the present invention will be described with reference to FIG. In the figure, 2a is the same part as the metal fitting shown in FIG. 2 provided at one end of the brake lever 2, and a circular hole 2b is formed in the vertical direction of the figure on the opposite side to which the brake lever 2 is attached. It is provided and the center of the round hole 2b is the metal fitting 2
It is located inside the side surface of a.

43a is an intermediate head of a rectangular parallelepiped, and an intermediate head 4
A round bar 43b is embedded on the central surface of the metal 3a on the side of the metal fitting 2a, the center of the round bar 43b is located outside the surface, and the round bar 43b is fitted into the round hole 2b of the metal fitting 2a. . Further, the surface of the intermediate head 43a opposite to the surface on which the round bar 43b is embedded is formed into a flat surface parallel to the axis of the round bar 43b, and round holes 43c are provided at both ends thereof. The center of the hole 43c is located inside the surface.

Reference numeral 41 is a brake shoe head, 7 is a brake shoe, and the brake shoe head 41 and the brake shoe 7 are composed of the same parts as shown in FIG. Similar to FIG. 2, the above components are assembled to form a brake shoe mounting device as follows. That is,
The round bar 43b of the intermediate head 43a is fitted into the round hole 2b of the metal fitting 2a, and the round bar 41a of the brake shoe head 41 is attached to the round hole 43c of the intermediate head. Then, similarly to the embodiment shown in FIG. 2, the limb protrusions 7a of the brake shoe 7 are attached and fixed to the rimlet 41b of the brake shoe head. Then, in order to support each part, the intermediate head 4
The pressing plates 44 are fixed to both end surfaces of the metal 3a, and the pressing plates 43 are fixed to both end surfaces of the metal fitting 2a.

Here, gaps G and G1 are formed between the brake shoe head 41 and the intermediate head 43a, and between the side surface of the brake shoe head 41 and the pressing plate 44, and the metal fitting 2a and the intermediate portion are formed. Gaps G, G1 are provided between the heads 43a and between the end faces of the metal fitting 2a and the pressing plate 43, respectively.
Is formed, and the brake head 41 is formed as in the embodiment of FIG.
Can be rotated by a predetermined angle with respect to the intermediate head 43a, and the intermediate head 43a can be rotated by a predetermined angle with respect to the metal fitting 2a.

As with the first embodiment shown in FIG. 2, the brake shoe mounting device constructed as described above is incorporated into the brake device shown in FIG. 1 and the cylinder 5 is driven.
The brake lever 2 rotates about a fulcrum 2d, and the brake shoe 7 is pressed against the disc surface 9b of the wheel 9. At this time, as described above, the intermediate head 43a can be rotated by a predetermined angle with respect to the metal fitting 2a, and the brake head 41 can be rotated by a predetermined angle with respect to the intermediate head 43a. Similar to the first embodiment, the pad 7b of the brake shoe 7 conforms to the disc surface 9b of the wheel 9 and presses the same, so that the pressure can be uniformly applied to the entire area of the pad 7b.

Further, since the pads 7b are attached at symmetrical positions with respect to the brake lever 2, the pressures applied by the two pads 7b can be balanced. Furthermore, as in the first embodiment shown in FIG. 2, the device can be easily assembled and structurally strong, and the reliability of the brake device can be improved.

FIG. 4 is an exploded perspective view showing a modified example of the brake shoe mounting device of FIG. 2, and a third embodiment of the brake shoe mounting device of the present invention will be described with reference to FIG. This embodiment is similar to the first embodiment shown in FIG.
It is provided in the direction perpendicular to the B axis, and the round bar of the brake shoe head is provided corresponding to the above-mentioned round hole. The other structure is basically the same as that of the embodiment of FIG.

In FIG. 4, at both ends of the intermediate head 52a,
A circular hole 52c is provided in parallel with the end surface orthogonal to the OA axis and the OB axis, and the brake shoe head 51 has the circular hole 52c.
A round bar 51a is embedded in the same direction as c. Further, as in the first embodiment, a gap G is formed between the brake shoe head 51 and the intermediate head 52a, and the brake shoe head 51 can be rotated by a predetermined angle with respect to the intermediate head 52a. Has been done.

Then, similarly to the first embodiment, the intermediate head 52
The round bar 51a of the brake shoe head 51 is attached to the round hole 52c of a, and the limb protrusion 7a of the brake shoe 7 is attached and fixed to the rimlet 51b of the brake shoe head, and the pressing plate 45 is attached to the intermediate head 52a.
Attach and fix. In this embodiment, the same effect as that of the first embodiment can be obtained, and the round hole 2
Since the directions of b and the round bar 42b are substantially orthogonal to the directions of the round hole 52c and the round bar 51a, the brake shoe 7 can move in the radial direction and the circumferential direction of the wheel with respect to the brake lever 2.
The disk surface 9b of the wheel can be adapted to make pressure contact.

FIG. 5 is an exploded perspective view of another modified example of the brake shoe mounting device, which shows an embodiment in which the brake shoe is provided in the radial direction of the disk surface of the wheel, as in FIG. ing.
Next, a fourth embodiment of the brake shoe mounting device of the present invention will be described with reference to FIG. This embodiment is different from the second embodiment shown in FIG. 3 in that the round hole of the intermediate head is provided parallel to the longitudinal direction of the intermediate head, and the round bar of the brake shoe head is provided in correspondence with the round hole. The other configuration is basically the same as that of the embodiment of FIG.

In FIG. 5, the intermediate head 53a is provided with a round hole 53c in parallel with its longitudinal direction, and the brake shoe head 51 is embedded with a round bar 51a in the same direction as the round hole 53c. ing. Further, like the second embodiment, a gap G is formed between the brake shoe head 51 and the intermediate head 53a, and the brake shoe head 51 is rotatable with respect to the intermediate head 53a by a predetermined angle. Has been done.

Then, as in the second embodiment, the round bar 51a of the brake shoe head 51 is attached to the round hole 53c of the intermediate head, and the rimming projection 7a of the brake shoe 7 is attached and fixed to the rimiso 51b of the brake shoe head. The pressing plate 46 is attached and fixed to the intermediate head 52a. In this embodiment, the same effect as that of the second embodiment can be obtained, and the round hole 2b and the round bar 4 can be obtained.
Since the direction of 2b is orthogonal to the directions of the round hole 53c and the round bar 51a, the brake shoe 7 can move in the radial direction and the circumferential direction of the wheel with respect to the brake lever 2, and the disc surface 9b of the wheel can be moved. It is possible to adapt and make pressure contact.

Although the brake lever 2, the cylinder 5, the return spring 6 and the like are used in the above embodiment, a caliper cylinder unit may be used instead of the brake lever 2, the cylinder 5, the return spring 6 and the like. You can also

[0048]

As described above, the following effects can be obtained in the present invention. Since at least two brakes that come into contact with both side surfaces of the wheel are provided on at least one surface, the pressure and the braking heat amount shared by each brake pad can be reduced when braking is applied. Therefore, it is possible to reduce the burnout of the pad when stopping the vehicle running at high speed and prevent the vehicle from running out of control. Plural pairs of brakes arranged in the circumferential direction described in the preceding paragraph,
By driving with a single drive mechanism, the drive mechanism of the brake device can be simplified, and the weight of the drive mechanism does not increase, and since the drive mechanism is not newly attached, Outfitting space can be saved. The connecting metal fitting is composed of a holding metal fitting to which the brake shoe is attached, and a brake lever that engages with this holding metal fitting.One end of the brake lever is attached to the center of the holding metal fitting, and the same number of brake shoe is mounted on both sides of the holding metal fitting. Is provided and a drive mechanism is provided at the other end of the brake lever, so that the pair of brake levers can operate the plurality of brake shoe in a well-balanced manner. By attaching the brake shoe to the brake lever so that it can move freely, it is possible to bring the brake shoe into contact with the disk surface of the wheel with equal pressure during braking, and prevent one-sided contact. By configuring the drive mechanism with the return spring and the cylinder, the brake device can be driven by a simple mechanism. By disposing the brake shoe on the circumference of the disk surface, the frictional forces applied to the brake shoes can be made substantially equal. By disposing the brake shoe in the radial direction of the disk surface, it is possible to simplify the structure of the holding metal fitting on which the brake shoe is mounted.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a disc brake device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a first embodiment of the brake shoe attachment device of the present invention.

FIG. 3 is a diagram showing a second embodiment of the brake shoe attachment device of the present invention.

FIG. 4 is a diagram showing a third embodiment of the brake shoe attachment device of the present invention.

FIG. 5 is a view showing a fourth embodiment of the brake shoe attachment device of the present invention.

FIG. 6 is a diagram showing a configuration of a conventional disc brake device.

FIG. 7 is a diagram showing a configuration of a conventional brake shoe attachment device.

FIG. 8 is a diagram showing a relationship between a braking force and an adhesive force between a wheel and a rail.

[Explanation of symbols]

1 Disc brake mount 2,22 Brake lever 2a Metal fitting 2b Round hole 2c Both end surfaces 2d, 22d Brake lever fulcrum part 3 Brake lever fulcrum part support metal fitting 3a Brake lever support pin 4,4a Holding metal fitting 5 Cylinder 6 Return spring 7 Suppressor 7a Alimizo insertion protrusion 7b Pad 8 Vehicle bogie frame 9 Wheel 9a Wheel tread 9b Disk surface 10 Axle 11 Rail 41,51 Bracket head 41a, 51a Round bar 41b, 51b Arimizo 42a, 52a Intermediate head holding bracket 42b Round bar 42c, 52c, 53c Round hole 42d Both end faces 42e Brace receiver 43a, 53a Middle head 42, 43, 44, 45, 46 Presser plate G, G1 Gap P Force of pressing brake disc to disk surface Pc Cylinder force R From wheel shaft center to tread Radius r up to the axis of the disc surface Radius to attached part OA, OB Axial direction of intermediate head angle side OC Axle center direction OO Axle center A, B Brake P / 2 center point of pressure α ° Angle A-OO-O, Angle B-OO
-O θ ° Angle A-O-OO, Angle B-O-
OO Pa Force of pushing brake shoe on wheel tread F F Brake force W Weight on brake shaft Q Adhesion of rail to wheel tread k Friction coefficient between wheel and brake shoe u Friction coefficient between wheel and rail

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kazuhiko Okazaki 3-8 Fukuura, Kanazawa-ku, Yokohama, Kanagawa Toyo Denki Seizo Co., Ltd.

Claims (7)

[Claims] 1. A vehicle disc brake device comprising a brake shoe which comes into contact with both side surfaces of a wheel, a coupling fitting for driving the brake shoe, and a drive mechanism mounted between the coupling fittings. A disc brake device for a vehicle, characterized in that at least two brake shoes, which come into contact with both side surfaces of the vehicle, are provided on at least one surface. 2. The disc brake device for a vehicle according to claim 1, wherein two or more brake shoes provided on one surface are driven by one drive mechanism. 3. The connecting fitting comprises a holding fitting to which the brake shoe is attached, and a brake lever engaged with the holding fitting. One end of the brake lever is attached to a central portion of the holding fitting,
The vehicle disc brake device according to claim 1 or 2, wherein a plurality of pairs of brake shoes are arranged on both sides of the brake lever, and a drive mechanism is provided at the other end of the brake lever. 4. The disc brake device for a vehicle according to claim 1, wherein the brake shoe is attached to the brake lever so as to be movable with a degree of freedom. 5. The disc brake device for a vehicle according to claim 1, wherein the drive mechanism includes a return spring and a cylinder. 6. The brake shoe is arranged on the circumference of the disk surface, as claimed in claim 1, 2, 3, 4 or 5.
Disc brake device for vehicles. 7. The vehicular disc brake device according to claim 1, wherein the brake shoe is arranged in a radial direction of the disc surface.