JP3516907B2 - Tread cleaning device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tread cleaning device for railway vehicles, and more particularly to a tread cleaning device having an indwelling brake function.

[0002]

2. Description of the Related Art In a railway vehicle, in addition to a basic (permanent) brake device that is commonly used for vehicle control during operation, an indwelling brake device is also provided to prevent rolling of the vehicle during detention in a yard or garage. Is required.

Conventionally, a tread brake device has been used as a basic brake device to obtain a braking force by pressing a brake shoe against the tread surface of a wheel. As the indwelling brake device, the pulling force obtained by rotating the handwheel is transmitted to the tread brake device, and the brake shoe is pressed against the tread of the wheel to obtain the indwelling brake force. Things were being used.

With the recent increase in speed of railway vehicles such as Shinkansen, a disc brake device is used as a basic brake device without using the tread brake device in order to effectively maintain the heat capacity and the tread shape of the wheels. ing. Then, the pressure air from the safety brake reservoir is used to shift to the one that operates the basic brake device, and the indwelling brake state is maintained in combination with the hand scotch, and the indwelling brake device is omitted. There is.

For example, in overseas countries, there is a demand for providing an indwelling brake device separately from the basic brake device.

[0006]

However, if a new indwelling brake device is provided, the brake device becomes complicated and the control system becomes complicated.

In a railway vehicle, when oil or the like adheres to the treads of the wheels, the frictional resistance between the rail and the rail decreases, so that the braking distance becomes longer when the brake is applied for deceleration, and when traveling. Also, the efficiency of transmission of the driving force from the wheels to the rail decreases. Therefore, in a railway vehicle using the tread brake device, tread cleaning is performed at the same time by pressing the brake shoe against the tread surface of the wheel when the brake is activated. Since cleaning is not performed, it is necessary to separately provide a dedicated tread cleaning device that presses a grinder having a high friction coefficient against the tread of a wheel for cleaning (for example, see Japanese Patent Laid-Open No. 7-19206).

Therefore, the inventor of the present invention has such a tread cleaning device which is provided with a pressure medium supply means for operation and uses a grinder having a high friction coefficient at a low speed because of its characteristic. The present invention has been made on the idea that the required braking force can be obtained more effectively with a small pressing force if the function is provided.

An object of the present invention is to provide a tread cleaning device having a detention brake function.

[0010]

In order to achieve the above-mentioned object, a tread cleaning device according to the present invention comprises a grinder for cleaning the tread and a spring for urging the grinder against the tread of a wheel. And a cylinder device that generates a force in the direction of reducing the spring force of the spring via a pressure medium, and a pressure medium supply unit that supplies the pressure medium to the cylinder device, in the tread surface cleaning device, the spring, Holds a spring force capable of urging the polishing element to the tread surface of the wheel with a pressing force that applies a braking force capable of maintaining the indwelling state, and the pressure medium supply means contracts the spring to move the polishing element. A first state in which a high-pressure pressure medium that is separated from the tread surface of the wheel is supplied, and a second state in which a low-pressure pressure medium that reduces the spring force of the spring to exert polishing performance on the polishing element is supplied. Of the spring The supply of pressure medium to release the reduction in the Ne force is intended to take selectively a third state to stop. The pressure medium may be air or hydraulic oil.

According to the tread surface cleaning device of the first aspect, when the vehicle is traveling, the spring is contracted to separate the grinder from the tread surface of the wheel into a first state in which a high pressure medium is supplied to the cylinder device. Completely lift it from the tread to release the indwelling braking force. Also, when cleaning the treads of the wheels,
A second state in which a low-pressure pressure medium for reducing the spring force of the spring to exert the polishing performance is supplied to the polishing element is set, and the polishing element is pressed against the tread surface with a force within a predetermined range to clean the tread surface. Further, when the vehicle is detained and braked, the third state in which the reduction of the spring force of the spring is released is restored, the spring force of the spring is restored, and the abrasive force is pressed against the tread to maintain the detained braking state.

As in the tread cleaning device according to claim 2,
In the cylinder device, a piston having a grinder attached to the tip of an output side piston rod is reciprocally inserted, and a cylinder provided with a pressure chamber connected to the pressure medium supply means is provided on the output side of the piston. The spring may be installed inside the cylinder on the side opposite to the output side of the piston.

According to the tread surface cleaning device of the second aspect, the piston can be moved forward and backward by adjusting the pressure medium fed to the pressure chamber of the cylinder. The abrasive force is pressed against the tread surface of the wheel by the spring force of, and the indwelling brake state is maintained.

According to a third aspect of the present invention, in the tread cleaning device, the pressure medium supply means supplies a supply / discharge pipe line connected to the pressure chamber of the cylinder device, a pressure source, and a pressure medium from the pressure source. After reducing the pressure medium from the high-pressure pipeline and the pressure source from the pressure source directly to the supply / discharge pipeline via the first electromagnetic switching valve to a predetermined pressure by the pressure reducing valve, A low pressure pipe for feeding the gas to the supply / discharge pipe via the second electromagnetic switching valve may be provided.

According to the tread surface cleaning device of the third aspect, when the vehicle is traveling, the low pressure pipe is cut off and the pressure medium is fed through the high pressure pipe, so that the piston is placed in the pressure chamber of the cylinder. Through this, a pressure is generated to contract the spring, which lifts the polishing element completely from the tread surface and releases the indwelling braking force. Also, when cleaning the tread surface of the wheel, the high-pressure pipe is shut off and pressurized air is sent through the low-pressure pipe, so that the spring force of the spring is abraded through the piston into the pressure chamber of the cylinder. Generates a pressure that reduces the force to the range where the polishing performance can be exerted, whereby the tread surface is cleaned by pressing the grinder against the tread surface with a force within the predetermined range. Further, when the vehicle is detained, the supply of the pressure medium via the high pressure line and the low pressure line is interrupted, and at the same time, the release function of one or both of the electromagnetic switching valves is operated to supply and discharge the pressure medium. By discharging the pressure medium and reducing the pressure in the cylinder pressure chamber, the spring force of the spring is restored, and the spring force presses the grinder against the tread surface to maintain the indwelling state.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1, 2 and 3 show an embodiment of a tread cleaning device according to the present invention, FIG. 1 is a diagram showing a schematic configuration of the device, FIG. 2 is a sectional view of a main part, and FIG. 3 is a mounting view of a main part.

As shown in FIG. 1, the apparatus of the present example is such that a tread cleaning grinder 1 and the grinder 1 are pressed against a tread W'of a wheel W by a spring force of an internally provided spring 2. A cylinder device 10 that reduces the spring force by the pressure of the pressurized air introduced into the cylinder 3 and floats the polishing element 1 from the tread surface W ′ is provided. In this cylinder device 10,
Pressure air is supplied by the pressure medium supply means 20.

The cylinder device 10, as shown in FIG.
A piston 4 having a grinder 1 attached to the tip of an output side piston rod 4a is reciprocally inserted, and a pressure chamber 3b communicating with the pressure medium supply means 20 via a port 3a is inserted on the output side of the piston 4. The cylinder 3 is provided, and a spring 2 for pressing the grinder 1 against the tread surface W'is provided in the rear portion of the cylinder 3 on the side opposite to the output side of the piston 4.

The spring 2 has a screw lid 5 which is screwed into the engaging portion on the rear surface of the piston 4 and the rear lid of the cylinder 3.
Both ends are engaged and supported by the engaging portion at the front end of the
Thus, the pressing force of the grinder 1 against the tread surface W'can be finely adjusted. Although not shown here, the screw lid 5 is provided with an intake / exhaust hole for preventing back pressure from rising in the space in which the spring 2 is arranged in the cylinder 3.

Further, a bellows type dust seal 6 is provided between the front surface of the cylinder 3 and the piston rod 4a.

Here, the grinder 1 is generally used for cleaning treads, has a high coefficient of friction at low speeds, and has a friction coefficient (μ = 0.15) that is recognized by the regulations of cast iron brake shoes. The friction coefficient is three times (speed 20 km / h: μ = about 0.4).

On the other hand, the spring 2 has a braking ratio (when the grinding element 1 is used as a brake shoe (the force acting on the brake shoe, that is, the sum of the forces determined by the friction coefficient and the pressing force of the brake shoe and the applicable vehicle). The ratio of the weight of the empty car) to the law (20% or more according to the domestic law of the hand brake device) or the pressing force that can satisfy the application specifications is applied by pressing the grinder 1 against the tread W ′ of the wheel W. It is supposed to have a spring force necessary and sufficient to obtain a braking force that can reliably hold the detained state of the vehicle. Therefore, in this cylinder device 10, as long as the spring 2 is not contracted by introducing pressurized air into the pressure chamber 3b of the cylinder 3 and moving the piston 4 backward while pressurizing it toward the opposite output side, the spring 2 is polished. The child 1 is pressed against the tread W'and the indwelling brake state is maintained.

On the other hand, as shown in FIG. 1, the pressure medium supply means 20 includes a supply / discharge pipe line 23 connected to the port 3a of the cylinder 3, a pressure air supply source 24, and the pressure air supply source 24. Pressure air from the pressure air supply source 24 and the high pressure pipe 21 for directly sending the compressed air to the supply / discharge pipe 23 through the three-position 4-port first electromagnetic switching valve 21a. Is reduced to a predetermined pressure by a pressure reducing valve 25, and is then supplied to a supply / discharge pipe line 23 via a two-position four-port type second electromagnetic switching valve 22a. There is. Further, the electromagnetic switching valves 21a and 22b of the high-pressure line 21 and the low-pressure line 22 block the opening / closing function and the supply of the pressure air, while the pressure air on the supply / discharge line 23 side is discharged from the respective discharge portions 21b, 21b. It has a release function of discharging the fluid to the cylinder 22b and reducing the pressure in the pressure chamber 3a of the cylinder 3 communicating therewith.

Although not shown here, the supply / discharge pipe line 23 is provided with a pressure detector for detecting the internal pressure and transmitting it to the control unit.

In the pressure medium supply means 20, the low pressure pipeline 22 is shut off and the high pressure pipeline 21 is cut off when the vehicle is traveling.
By supplying the pressurized air via the, the high pressure medium for contracting the spring 2 is supplied into the pressure chamber 3b of the cylinder 3 via the piston 4 (first state). As a result, the grinder 1 is completely lifted from the tread surface W ′ and separated, and the indwelling braking force is released. In addition, as long as there is no special air leakage or the like by blocking the pressure in the pressure chamber 3b by shutting off the high pressure pipe 21 after the pressure air is sent to the pressure chamber 3b to contract the spring 2. It is possible to maintain the unloaded state in which the grinder 1 is raised with respect to the tread surface W ′.

When cleaning the tread W ', the high pressure line 2
1 is cut off and compressed air is sent through the low pressure pipe 22, the spring 2 is contracted into the pressure chamber 3b of the cylinder 3 via the piston 4, and the spring force is reduced. Supplies a low-pressure pressure medium that reduces the force to a range where polishing performance can be exhibited (second state). As a result, the tread 1 is pressed against the tread W'with a force within a predetermined range to clean the tread.

When the vehicle is detained, the pressure air passing through the high pressure line 21 and the low pressure line 22 is cut off, and
The release function of one or both of the electromagnetic switching valves 21a and 22a is operated to discharge the pressure air on the supply / discharge pipe line 23 side to reduce the pressure in the pressure chamber 3b of the cylinder 3 (third state). As a result, the contraction of the spring 2 is released, the spring force is restored, and the grinder 1 is pressed against the tread surface W ′ to maintain the indwelling brake state.

On the other hand, in the cylinder device 10, as shown in FIG. 3, the cylinder 3 is oscillatably supported by the bogie portion T of the vehicle via the pin engagement type fixture 7, while the cylinder 3 is 1 attached to the tip of the piston rod 4a
Is suspended and supported on the carriage T by the link type support rod 8 so as to be able to move back and forth, and by this support form, the pressing position of the grinder 1 against the tread surface W'is stabilized.

As described above, the apparatus of this embodiment feeds the high pressure side pressure air to the cylinder 3 to lift the polishing piece 1 from the tread W'and the low pressure side pressure air mode. To feed the grinding wheel 1 to the tread W'with a force within a predetermined range.
It is possible to operate in three modes: a tread surface cleaning mode in which the pressure is applied to the tread surface, and an indwelling brake mode in which the sent pressure air is removed to press the grinder 1 against the tread surface W '.

In the indwelling brake mode, when the compressed air is removed from the cylinder 3, the spring 2 causes the polishing element 1 to move.
Since the detention state is maintained by the braking force obtained by pressing against the tread surface W ', that is, the braking force independently obtained by the spring force of the spring 2, compared to the conventional system in which the disc braking device maintains the detention state. As a result, the device can be greatly simplified, and since the high frictional resistance of the polishing element 1 is utilized, the required indwelling braking force can be obtained with a relatively small pressing force, and the device can be easily downsized. Also, if compressed air is not supplied due to a failure,
Since the indwelling brake is actuated by the spring force of the spring 2, it has an advantageous function in stopping the railway vehicle.

In the above embodiment, the cylinder device 1
Although pressure air was used as the pressure medium for activating 0, this is an example, and a pressure medium other than pressure air may be used as long as the desired pressure transmission effect can be obtained. For example, the cylinder shown in FIG. It is also a preferred embodiment to use hydraulic fluid as the pressure medium as in the apparatus 10 '.

FIG. 4 is a sectional view of a cylinder device provided in another embodiment of the tread surface cleaning device having the indwelling brake function of the present invention. It should be noted that this cylinder device is substantially equivalent in configuration and operation to the cylinder device provided in the above-described embodiment except that the pressure medium to be used is hydraulic oil. Are denoted by the same reference numerals and description thereof will be omitted, and only the differences will be summarized and described.

The cylinder device 10 'of this example shown in FIG.
The hydraulic oil is used as the pressure medium, and the port 3a 'for introducing the hydraulic oil into the pressure chamber 3b' of the cylinder 3'is
It is provided on the front cover on the output side of the cylinder 3 '. In addition, the inner diameter of the cylinder 3'is smaller than that using pressure air, and accordingly, the diameter of the screw lid 5'which is screwed into the rear lid is also smaller, so that the rear end portion of the spring 2 is It is engaged and supported via a retaining ring 5a arranged at the tip of the screw lid 5 '. As described above, in the present example in which the hydraulic fluid is used as the pressure medium, it is easier to reduce the size and weight of the device.

[0035]

As described above, in the tread surface cleaning device according to the present invention, the spring of the cylinder device for pressing the tread cleaning abrasive onto the tread surface of the wheel applies the braking force that can maintain the indwelling state. Since a spring force capable of urging the polishing element to the tread surface of the wheel by pressure is held, and the spring force is adjusted by using the pressure of the pressure medium supplied by the pressure medium supply means, it is easy. With such a structure, the indwelling brake function can be provided only when necessary while ensuring the tread cleaning function. Therefore, without depending on the pressure medium from the outside such as the pressure air of the safety brake reservoir,
The required braking force can be independently obtained, and thus the indwelling brake state can be reliably maintained with a simpler configuration.

According to the tread surface cleaning device of the second aspect, if the pressure medium is not supplied to the pressure chamber of the cylinder, the abrasive force is pressed against the tread surface of the wheel by the spring force of the spring to activate the indwelling brake. , You can easily operate the indwelling brake.

In the tread surface cleaning device according to the third aspect of the present invention, the pressure medium supply means includes a supply / discharge pipe line connected to the pressure chamber of the cylinder device, a pressure source, and a pressure medium from the pressure source. The pressure medium from the high-pressure pipeline and the pressure source, which is directly fed to the supply / discharge pipeline via the electromagnetic switching valve, is decompressed to a predetermined pressure by the decompression valve, and then the second electromagnetic Since the low-pressure pipeline for feeding the supply / discharge pipeline through the switching valve is provided, the vehicle running state, the tread cleaning state, and the indwelling brake state can be easily switched with a simple structure. .

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an embodiment of a tread cleaning device according to the present invention.

FIG. 2 is a cross-sectional view of a main part of the same device.

FIG. 3 is a diagram showing a mounted state of a main part of the apparatus.

FIG. 4 is a sectional view of a cylinder device provided in another embodiment of the present invention.

[Explanation of symbols]

1 abrasive 2 spring 3 cylinders 4 pistons 10 cylinder device 20 Pressure medium supply means 21 high pressure pipeline 21a Solenoid switching valve 22 Low pressure line 22a Solenoid switching valve 23 Supply and discharge pipeline 24 Pressure air supply source 25 Pressure reducing valve W ′ tread

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Claims (3)

(57) [Claims] 1. A grinder for cleaning a tread, a spring for urging the grinder against the tread of a wheel, and a cylinder for generating a force in a direction for reducing the spring force of the spring via a pressure medium. In a tread surface cleaning device including a device and a pressure medium supply means for supplying a pressure medium to the cylinder device, the spring causes the grinder to tread the wheel with a pressing force that gives a braking force capable of maintaining an indwelling state. A first state in which the pressure medium supply means supplies a high-pressure pressure medium that contracts the spring and separates the grinder from the tread surface of the wheel; A second state in which a low-pressure pressure medium that reduces the spring force to exert polishing performance on the polishing element is supplied, and a third state in which the supply of the pressure medium is stopped so as to cancel the reduction in the spring force of the spring. And the selective Tread cleaning apparatus characterized in that to take. 2. In the cylinder device, a piston having a grinder attached to the tip of an output side piston rod is reciprocally inserted, and a pressure chamber connected to the pressure medium supply means is provided on the output side of the piston. The tread cleaning device according to claim 1, further comprising a cylinder provided with the spring, wherein the spring is internally provided on an opposite output side of a piston in the cylinder. 3. The pressure medium supply means supplies a supply / discharge pipe line connected to a pressure chamber of the cylinder device, a pressure source, and a pressure medium from the pressure source via a first electromagnetic switching valve. The pressure medium from the pressure source, which is directly fed to the supply / discharge pipe line, and the pressure medium from the pressure source are reduced to a predetermined pressure by the pressure reducing valve, and then the second electromagnetic switching valve is used to reduce the pressure medium. The tread cleaning device according to claim 2, further comprising a low-pressure pipe line that feeds toward the supply / discharge pipe line.