JPH0382667A - Unit brake for railroad vehicle - Google Patents

Abstract

PURPOSE:To obtain a brake with a simple structure by screwing a nut body screwed with a screw shaft with the rotation of an electrically driven motor with brake, and bringing a brake block into contact with the outer periphery of an iron wheel via a spring and a piston body. CONSTITUTION:A motor with brake 23 storing a reduction mechanism 22 is fixed on one end face of a cylinder case 21 fixed to the vehicle body side, when an operator operates a steering device to drive the motor 23, a screw shaft 24 is rotated, and a nut body 25 screwed with it is screwed in the direction (f) against a spring 29. An extending force is stored in the spring 29, a piston body 28 is pressed to the direction f1 against a spring 36 by this extending force, and a brake block 31 is displaced in the direction f1 together with a pushing bar 28a. When the brake block 31 is brought into contact with the outer periphery of an iron wheel 37, the preset braking force is generated. The motor 23 is controlled so that the momentary deceleration degree is made the preset value.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a unit brake for a railway vehicle in which a brake shoe, a drive device, a link mechanism that interlocks and connects these, and the like are made into four-wheeled brakes.

(Prior Art) As a unit brake for a railway vehicle, one shown in FIG. 4 is already known.

In the figure, ■ is a box-shaped case, and an arm 3 is provided inside the case 1 and is swingable around a support shaft 2 fixed to the case 1.

An adjusting screw rod 7 is engaged in the longitudinal direction of the arm 3 via a spherical bearing 4 and a slide adjuster 5 (adjusting screw nut 6, etc.). A brake shoe 9 is connected to the tip of the threaded rod 7 via a pin 8, and the brake shoe 9
is the pin 1 from the support part 10 extending from the top of the case 1.
It is also supported via a pin 13 at the lower end of a hanging hand 12 which is suspended via a pin 13. On the other hand, a brake driving cylinder 17 consisting of a piston 14, a braking force release spring 15, a cylinder case 16, etc. is provided in the upper part of the case 1.

The tip of the piston rod 14a extending from the piston 14 and the upper end of the arm 3 are connected via a pin 18. Reference numeral 19 denotes a manual arm that is swingably attached to a support shaft 20 fixed to the case 1. The tip of this arm is engaged with the pin 18, and when the arm 19 is swung, the arm 19 is rotated. 3, etc. are oscillated and displaced as appropriate.

To generate braking force in such a unit brake, compressed air at an appropriate pressure is supplied to the brake driving cylinder 17 to move the piston rod 14a in the direction of the arrow f1. As a result, the arm 3 swings about the pin 2 in the arrow direction f2, and the brake shoe 9 is displaced together with the adjusting screw rod 7 in the arrow direction f3 via the spherical bearing 5 and the adjusting screw nut 6. During this time, the brake shoe 9 is
It continues to be supported and regulated in a predetermined appropriate position.

Thus, the sliding surface 9a of the brake shoe 9 comes into pressure contact with the outer peripheral surface of a railway wheel (not shown) and generates a braking force. At this time, when the brake shoe 9 is worn out and the arm 3 is swung beyond a certain angle, the protrusion 3a of the arm 3 rotates the adjustment screw nut 6 of the slack adjuster 5 in a certain direction, and the brake shoe The adjustment screw rod 7 is moved in the direction of the arrow f3 by the wear amount of 9. Conversely, when the braking force is eliminated, compressed air is discharged from the cylinder 17, but at this time the brake shoes 9 and the arm 3 are released by the brake release spring 15.
This will restore the state to the state before the brake was applied.
The braking force that had previously been acting on the railway wheels disappeared.

(Problem to be Solved by the Invention) In the unit brake described above, since the brake driving cylinder 17 for operating the brake is of a pneumatic type, it is necessary to generate compressed air to be supplied to the cylinder 17. An air pressure control device to automatically adjust the pressure of the compressed air in the cylinder 17 during the operation of the compressor and brake, an air reservoir to store the compressed air, etc. are required. Problems like this arose.

B. Compressors, pressure control devices for compressed air, and air reservoirs generally require a large installation space; Generally, these devices are installed in the space under the floor, so the space becomes narrow and it becomes difficult to install other devices.

C. Railway vehicles are generally equipped with a plurality of compressors in case the compressor that serves as the power source breaks down, but these compressors are expensive and increase manufacturing costs.

2. Compressors, compressed air pressure control devices, and air reservoirs are generally heavy, which increases the weight of railway vehicles.
Large running power is required.

An object of the present invention is to provide a brake drive device that makes it possible to rationally solve the above-mentioned problems.

(Means for Solving the Problems) In order to achieve the above object, the present invention forms a cylinder case, and fixes a brake-equipped motor with a built-in deceleration mechanism on one end surface of the cylinder case, and decelerates the rotation of the motor. positioning a screw shaft transmitted through the mechanism inside the case;
Moreover, a nut body guided only in the direction of the central axis of the case is screwed onto the screw shaft, and a rotation detection encoder linked to the motor is provided, and a piston body is mounted inside the case. A push rod formed on one surface of the piston body is inserted and extends from the other end surface of the case, and a compression spring is disposed between the piston body and the nut body. A sensor for detecting the relative position is provided to form a brake drive device, and a brake shoe is attached to the tip of the push rod, while a support arm is extended from the case and a brake lever is attached to the tip of the arm. It is characterized in that a suspension arm is pivotally attached via a pin, and the brake shoe is supported via the suspension arm.

Further, the following invention may be made in which the main part is the same as the above invention, that is, a box-shaped case is formed, and the arm is swingably supported via a support shaft provided inside the box-shaped case. A push rod is horizontally connected to the lower end of the arm, and a brake shoe is attached to the tip of the push rod, and a brake drive device similar to the above is connected horizontally to the upper surface of the box-shaped case. so that it is fixed horizontally,
In addition to connecting the upper end of the arm and the tip of the push rod with a diagonal link, the brake shoe is supported via a hanger hanging from the box-shaped case or the cylinder case.

(Function) Unlike the conventional air-operated brake cylinder, the brake drive device in the first and second inventions operates using electricity as a power source, so it does not use a compressor or compressor as in the conventional brake device. This eliminates the need for an air pressure control device or an air reservoir, and solves various problems caused by these.Also, in the former invention, the brake shoes are directly attached to the push rod of the brake drive device. This simplifies the overall configuration of the unit brake.

On the other hand, in the latter invention, the pressing force of the push rod is transmitted to the brake shoe through the arm and the link, which increases the displacement force of the brake shoe compared to the former invention, and increases the braking force. Furthermore, by fixing the brake drive device horizontally on the upper surface of the box-shaped case, the overall size (especially the horizontal length) of the unit brake can be made more compact.

(Example) Hereinafter, specific examples of the present invention will be described in detail with reference to the drawings.

1 and 2 relate to a first embodiment of the device of the present invention, FIG. 1 is an overall side view with a part cut away, and FIG. 2 is a sectional view taken along the line X-X in FIG. 1. be.

Reference numeral 21 denotes a cylinder case which serves as a medium for fixing to a vehicle or the like, and openings 21a and 21b are provided at both end faces.

A brake-equipped motor 23 with a built-in deceleration mechanism 22 is fixed to one end surface of the cylinder case 21, and a screw shaft 24 to which the rotation of the motor 23 is transmitted via the deceleration mechanism 22 is connected to the case 21 through the opening 21a. The rollers 26 and 26 are located inside the case 2, and the rollers 26 and 26 are arranged in guide grooves 21c and 2 formed in the case 2 in the central axis direction.
1 will guide you. Further, an encoder 7 for detecting the rotation of the motor 3 is interlocked with the motor 3.

On the other hand, a piston body 28 is inserted into the case 21, and a push rod 28 formed on one surface of the piston body 28 is inserted into the case 21.
a extends from the opening 21b on the other end surface of the case 21. A compression spring 29 is disposed between the piston body 28 and the nut body 28. Furthermore, a sensor 30 for detecting the relative position of the screw shaft 24 and the piston body 28
Here, a hole 28b into which the tip of the screw shaft 24 enters is provided in the center of the piston body 28.
A sensor 30 is provided integrally with the piston body 28 to detect that the tip of the screw shaft 24 has entered beyond a certain length into the piston body 28.

The configuration described above is the brake drive device A, and in the present invention, a brake shoe 31 to which a sliding member 31a is fixed is attached via a pin 32 to the tip of the push rod 28a.

On the other hand, a support arm 33 is extended from the case 21, and a handle 35 is pivotally attached to the tip of the arm 33 via a pin 34. The tip of the handle 35 and the brake shoe 31 are supported via the pin 32.

Note that 36 is a tension spring for releasing the brake, and 37 is an iron wheel that supported the vehicle.

When using the device of this embodiment configured as described above, for example, one device is provided for each iron wheel 37 of the vehicle and is fixed to the vehicle via the cylinder case 21 etc. is as follows. That is, when the operator sends a signal to operate the device of this embodiment via an appropriate control device, the motor 23 is activated and rotates the screw shaft 24, thereby displacing the nut body 25 in the direction of the arrow f1. is applied to compress the spring 29 and generate an extension force in the spring 29. The extension force presses the piston body 28 in the direction of the arrow f1 against the tensile force of the spring 36, so that the brake shoe 31 is pushed against the push rod 2.
8a in the direction of the arrow f1, and finally the iron wheel 37
After this, it is pressed against the outer peripheral surface of the motor 23 with a pressing force proportional to the amount of rotation of the motor 23, thereby generating a predetermined braking force. At this time, a tensile force along the outer peripheral surface of the iron wheel 37 acts on the brake shoe 31 as a reaction force of the braking force, and this tensile force is supported by the handle 35 or the like.

However, when the speed of the vehicle begins to decrease due to the braking force, an encoder (not shown) provided to detect the vehicle speed (such as a tachogenerator) continuously transmits the detection result to a computer (not shown). Then, the computer calculates the deceleration rate from time to time based on the detection results, and calculates the deceleration rate from time to time based on the detection result.
The rotation of the motor 23 is controlled via appropriate electric circuit means and the encoder 27 so that the set value is reached, and thereby the vehicle is smoothly stopped at a constant deceleration.

On the other hand, when the operator sends a signal to deactivate the device of this embodiment, the motor 23 operates in the opposite manner to that described above, and the nut body 25 is displaced to release the compression of the spring 29. Therefore, when the brake is in operation, the tip of the screw shaft 24, which has penetrated deep into the hole 28b, is gradually displaced so that it comes out from within the hole. For example, if the setting is such that the tip of the screw shaft 24 also leaves the detection position of the sensor 30 at the moment the sliding member 31a of the brake shoe 31 leaves the circumferential surface of the iron wheel 37, then The sensor 30 becomes inactive at the moment when the sliding member 31a of the brake motor 31 separates from the circumferential surface of the iron wheel 37, and the computer to which the signal from the sensor 30 at that moment is transmitted is activated at the moment. Then, the motor 23 is controlled to further rotate in the same direction by a fixed number of rotations and then stopped. For this reason, the brake shoe 31
is further moved a certain distance away from the circumferential surface of the iron wheel 37 from the moment when the sensor 30 becomes inactive, assisted by the tensile force of the spring 36. This movement of the brake shoe 31 determines the gap between the sliding member 31a and the circumferential surface of the iron wheel 37 when the brake is not in operation. Therefore, even if the sliding member 31a is worn out, the brake shoe 31 The gap with the circumferential surface of the iron wheel 37 is always maintained constant.

FIG. 3 is an overall side view, partially in section, relating to a second embodiment of the device of the present invention. Here, the same reference numerals are given to substantially the same parts as in the apparatus of the previous embodiment.

In the figure, a box-shaped case 38 has openings 38a and 38b formed on opposing surfaces, and a lid 39 is provided over one opening 38a.

A support shaft 40 is protruded from the side surface of the case 38, and an arm 41 is swingably supported via the support shaft 40. A press rod 42 is connected horizontally to the lower end of the arm 41, and the brake shoe 31 is attached to the tip of the press rod 42 via a pin 43.

On the other hand, a brake drive device A similar to that of the first embodiment is fixed to the upper surface of the box-shaped case 38 in a horizontal position with the push rod 28a horizontal.

Then, the upper end of the arm 41 and the tip of the push rod 28a are connected with pins 45 and 46 by a diagonal link 44.

Reference numeral 47 denotes a hanging hand that is swingably suspended from the box-shaped case 38 or the cylinder case 21 via a pin 48, and here supports the brake shoe 31 via the pin 43.

The device of this embodiment is used in accordance with the device of the previous embodiment, and is mounted on a vehicle via a box-shaped case 38 or the like.

The brake drive unit WA operates in the same manner as in the previous embodiment, and when the push rod 28a is displaced in the arrow direction f5, the displacement is transferred to the brake shoe 31 via the link 44, the arm 41, etc.
Therefore, the brake shoe 31 is moved in the direction of the arrow f6 to generate an appropriate braking force between it and the iron wheel 37.

On the other hand, when the push rod 28a is displaced in the opposite direction to the arrow direction f5, the brake shoe 31 is also moved in the opposite direction to the arrow direction f6, and eventually a certain gap is formed between it and the outer peripheral surface of the iron wheel 37. As a result, the brake shoe 31 is completely brought into a non-braking state. At this time, the position of the support shaft 40 in the arm 41 is such that the pressing force of the brake shoe 31 can be varied in various ways based on the lever principle.

(Effects of the Invention) As described above, according to the present invention, since the unit brake is driven by an electrically powered motor with a brake, a compressor or compressed air is used to operate the conventional unit brake. This eliminates the need for a pressure control device or an air reservoir, and solves the problems described at the beginning, ie, the problems caused by these devices.

Furthermore, the invention as claimed in claim 1 simplifies the interlocking mechanism between the brake drive device and the brake shoe, and the invention as claimed in claim 2 allows the displacement of the brake drive device to be transmitted to the brake shoe via a link, an arm, etc. Because it is a transmission device, the moving force of the brake shoe (i.e., braking force) can be increased appropriately, and since the brake drive device is fixed horizontally to the box-shaped case, the entire screw axis direction can be improved. FIG. 1 and FIG. 2 are all related to the first embodiment of the device of the present invention, with the length being shortened, and FIG.
The figure is a cross-sectional view showing the section X-X in Fig. 1, Fig. 3 is an overall side view of the second embodiment, with a part cut away, and Fig. 4 is a cross-sectional view of the conventional FIG. 3 is an overall side view of the unit brake.

A...Brake drive device, 21...Cylinder case, 22...Deceleration mechanism, 23...Motor with brake,
24... Screw shaft, 25... Nut body, 27... Encoder, 28... Piston body, 29... Spring, 30... Sensor, 28a... Push rod, 31...
Brake shoe, 33... Support arm, 34... Pin, 35
...Hanging hand, 38... Box-shaped case, 40... Support shaft, 42... Pressing rod, 44... Link, 47... Hanging hand.

Claims (2)

[Claims] (1) A cylinder case is formed, and a brake-equipped motor with a built-in deceleration mechanism is fixed to one end surface of the cylinder case, and a screw shaft through which the rotation of the motor is transmitted via the deceleration mechanism is located inside the case. In addition, a nut body guided only in the direction of the central axis of the case is screwed onto the screw shaft, and a rotation detection encoder linked to the motor is provided, and a piston body is provided in the case. At the same time, a push rod formed on one surface of the piston body is extended from the other end surface of the case, and a compression spring is disposed between the piston body and the nut body. A brake drive device is constructed by providing a sensor for detecting the relative position of the push rod, and a brake shoe is attached to the tip of the push rod, while a support arm is extended from the case and the support arm is A unit brake for a railway vehicle, characterized in that a handle is pivotally attached to the tip, and the brake shoe is supported via the handle. (2) A box-shaped case is formed, an arm is swingably supported via a support shaft provided inside the case, and a press rod is horizontally connected to the lower end of the arm, and the tip of the press rod is connected to the press rod in a horizontal manner. On the other hand, a cylinder case is formed, and a brake motor with a built-in deceleration mechanism is fixed to one end surface of the cylinder case, and the rotation of the motor is transmitted via the deceleration mechanism. A screw shaft is located inside the case, and a nut body guided only in the direction of the central axis of the case is screwed onto the screw shaft, and a rotation detection encoder linked to the motor is provided. On the other hand, a piston body is inserted into the case, a push rod formed on one surface of the piston body is extended from the other end surface of the case, and a compression spring is provided between the piston body and the nut body. In addition, a sensor is provided to detect the relative position of the screw shaft and the piston body, thereby making it a brake driving device. In addition to fixing the brake shoe in a horizontal position and connecting the upper end of the arm and the tip of the push rod with a diagonal link, the brake shoe is supported via a hanging hand that is vertically disposed from the same part as the cylinder case. A unit brake for railway vehicles that is characterized by: