JPS6354586B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brake unit for a railway vehicle having a brake force amplification mechanism using a wedge and a brake shoe support mechanism.

As a conventional brake unit of this type, a brake unit disclosed in Japanese Patent Application Laid-Open No. 129871/1983 is known. This conventional brake unit has the following configuration. That is, in FIGS. 1 to 3, there is shown a main body 2 having a pressure fluid supply/discharge port 1, and a spring provided in the main body 2 so as to be movable up and down in the brake release direction (upward in FIG. 1). 3 and the piston 4 urged by the main body 2
an adjusting body 7 which has a support shaft 5 provided therein so as to be movable back and forth and protrudes left and right, respectively, and is further biased by a spring 6 in the brake release direction (rightward in FIG. 1); A first shaft rotatably provided on each of the support shafts 5 of the body 7 via a first roller 8a.
rollers 8, and second rollers 9a on the rear main body portion of the first rollers 8, facing the first rollers 8;
a second roller 9 rotatably provided through the
The lower part is inserted between the first roller 8 and the second roller 9, and the upper part is fixed to the piston 4, and furthermore, the reaction surface 10a in the vertical direction contacts the second roller 9 and the reaction surface 10a. Working surface 10b that is inclined with respect to the first roller 8 and comes into contact with the first roller 8
a tapered fork-shaped wedge 10 having
In addition to the hanging tool 14, which is built into the sleeve 11 in the front-rear direction, loosely fits into the front wall 2a of the main body 2, projects outside the main body 2, and has one end pivotally supported on the support arm 12 of the main body 2 with a pin 13. It consists of a push rod 17 which is pivotally supported by a pin 15 at its end and has a brake shoe 16 connected to its front end. Then, the front end of the push rod 17 and the hanging tool 14
The pin 15 is pivotally supported to the other end by fitting the pin 15 into a vertical elongated hole 19 formed in a fixture 18 fixed to the front end of the push rod 17.

To explain the operation of a conventional brake unit with such a configuration, first, when applying the brakes, pressure fluid is supplied from a pressure supply source to the supply/discharge port 1 based on a command from a driver's cab (not shown). Then, the piston 4 descends against the biasing force of the spring 3, and the wedge 10 also descends accordingly.
Then, the reaction surface 10a descends directly downward while coming into contact with the rotating second roller 9 at that position, so that the action surface 10b, which is inclined with respect to the reaction surface 10a, moves the first roller 8 of the adjustment body 7. Push forward (toward brake shoe 16). Therefore, the adjusting body 7 has a spring 6
The sleeve 11 provided on the adjustment body 7 and the push rod 17 built in the sleeve 11 also move forward, and the brake shoe pivotally supported on the front end of the push rod 17 moves forward. 16 to the wheels of a vehicle (not shown) to apply the brakes.

Next, when the brake is released, when the pressure fluid is discharged from the supply/discharge port 1 according to a command from the driver's cab, the piston 4 rises due to the biasing force of the spring 3, and the wedge 10 will also rise. Then, the first roller 8 in contact with the action surface 10b moves rearward (in the opposite direction to the brake shoe 16). This is because the adjustment body 7 is pushed rearward by the biasing force of the spring 6, and as the adjustment body 7 moves rearward, the sleeve 11 and the push rod 17 also move rearward, so that the front end of the push rod 17 The brake shoes 16 also move rearward and away from the vehicle wheels, loosening the brakes.

In such conventional brake units,
When the wedge 10 moves downward, a forward and downward force F acts on the sleeve 11 as shown in FIG. A high-precision bushing 20 is required, but this makes assembly and disassembly difficult and maintenance complicated.
Further, the push rod 17 built into the sleeve 11 is pushed forward, but since the brake shoe 16 is supported by the hanger 14, it also moves in the vertical direction.
The push rod 17 and brake shoe 16 cannot be fixed, and the mounting tool 18
It is necessary to support it with a pin 15 within an elongated hole 19 formed in the vertical direction. For this reason, there is a drawback that rattling is likely to occur, causing vibration and noise, and complicating maintenance. Furthermore, by using the bush 20, the length of the brake unit in the longitudinal direction becomes correspondingly longer, but since the mounting space is generally limited in the bogie of a railway vehicle,
This has the disadvantage that the installation of the brake unit on the truck becomes more complicated.

This invention has been made in view of the above circumstances with the aim of eliminating the drawbacks of the prior art, and is characterized in that the support shaft in the conventional brake unit is moved outward from the first roller in the left and right direction. A third roller is rotatably provided on each of the extending portions of these support shafts, and a guide is provided below the third roller in the front-rear direction of the main body portion, with which the third roller abuts and rotates. It's there.

Examples of the present invention will be described below with reference to FIGS. 4 to 6.

Incidentally, parts common to the conventional brake unit described above are given the same reference numerals, and explanations of their configurations and operations will be omitted.

The push rod 17 is loosely fitted into the front wall 2a of the main body 2 and has a front end protruding outside the main body 2, and a support arm 12 fixed to the main body 2 is attached to a fixture 18 at the front end.
The other end of the suspension 14, one end of which is rotatably attached to the other end by a pin 13, and the center portion of the brake shoe 16 are rotatably connected to each other by a pin 15. Further, a support shaft 5 provided to protrude in the left-right direction of the adjustment body 7 extends outward in the left-right direction from the first roller 8, and a third roller 22 and a third roller 22a are attached to the extending portions 21 of these support shafts 5, respectively. It is rotatably provided through the Further, guides 23 are provided below the third rollers 22 in the front-rear direction of the main body portion, with which the third rollers 22 come into contact and rotate.

Next, the operation of this embodiment will be explained.

When applying the brake, pressure fluid is supplied from the supply/discharge port 1 and the piston 4 and wedge 10 descend, so that the action surface 10 of the wedge 10 is lowered.
When the first roller 8 in contact with b is pushed forward and the adjustment body 7, sleeve 11, and push rod 17 move forward, the third roller 22 rotatably provided on the extension portion 21 comes into contact with the guide 23. Move forward while rotating. This is because the action surface 10b presses the first roller 8 obliquely forward and downward, and as a result, the adjusting body 7 and sleeve 11 can be moved forward without requiring any other auxiliary means. On the other hand, the brake shoe 16, which is rotatably supported by a pin 15 on a fixture 18 at the front end of the push rod 17, can also be moved up and down to some extent by rotational movement around the pin 13 at one end of the hanging fixture 14. while moving toward the vehicle's wheel tread.

As the brake shoe 16 moves up and down, the front end of the push rod 17 also moves up and down, but this is alleviated by the rotation of the third roller 22 in the extension 21, so there is no problem. will not occur. Furthermore, since the front end of the push rod 17 is loosely fitted into the front wall 2a of the main body 2, the vertical movement of the front end of the push rod 17 is not blocked by the front wall 2a of the main body 2. The above operation is the same when the brake is released.

As described above, in the brake unit of the present invention, the third roller 22 is rotatably attached to the extending portion 21 extending further outward in the left-right direction from the first roller 8 of the support shaft 5 provided in the conventional brake unit. At the same time, a guide 23 for abutting and guiding the third roller 22 in the front-rear direction is provided at the lower part of the main body 2, and furthermore, the front wall 2a of the main body 2 and the front end portion of the push rod 17 are loosely fitted. , the brake shoe 16 is connected to the suspension tool 1.
Even if the third roller 22 moves in the vertical direction due to rotational movement around the pin 15 of No. 4, the push rod 17 The mounting portion 18 at the front end of the brake shoe 16 and the brake shoe 16 can be rotatably supported by a pin 15. For this purpose, the fixture 18 is
Since vertical elongated holes are formed in the brake shoe 16 to absorb the vertical movement of the brake shoe 16, no rattling occurs, and therefore vibration and noise can be prevented, improving the durability of the brake unit. do. Furthermore, since there is no sliding part between the push rod 17 and the main body 2, there is no need for a bush provided between the push rod 17 and the main body 2, and as a result, it is possible to shorten the length of the brake unit in the longitudinal direction. Therefore, the work of attaching and detaching from the trolley becomes easy. Furthermore, the work of assembling and disassembling the brake unit is simplified and work efficiency is improved.

[Brief explanation of the drawing]

Figures 1 to 3 show a conventional brake unit, with Figure 1 being a longitudinal sectional view and Figure 2 being the same as that shown in Figure 1.
A line sectional view, Figure 3 is a - line sectional view of Figure 2,
4 to 6 show embodiments of the brake unit of the present invention, FIG. 4 is a longitudinal sectional view, FIG. 5 is a sectional view taken along the line - - in FIG. 4, and FIG. 6 is a -
A line cross-sectional view is shown respectively. 1... Supply/exhaust port, 2... Main body, 2a... Front wall,
3, 6... Spring, 4... Piston, 5... Support shaft, 7... Adjustment body, 8... First roller, 9... Second roller, 10... Wedge, 10a... Reaction surface, 10b ... Working surface, 11 ... Sleeve, 14
... Hanging device, 16 ... Brake shoe, 17 ... Push bar, 2
DESCRIPTION OF SYMBOLS 1... Extension part, 22... Third roller, 23... Guide.

Claims (1)

[Scope of Claims] 1. A main body having a pressure fluid supply/discharge port, a piston provided within the main body so as to be movable up and down and biased by a spring in the direction of releasing the brake, and a piston movable back and forth within the main body. an adjusting body provided with supporting shafts protruding left and right, respectively, and further biased by a spring in the direction of releasing the brake; a first roller rotatably provided on each of the supporting shafts of the adjusting body; A second roller is rotatably provided in the main body portion behind the first roller, and the lower part thereof is inserted between the first roller and the second roller, and the upper part thereof is inserted between the first roller and the second roller. a tapered fork-shaped wedge that is fixed to the piston and has a reaction surface in the vertical direction that contacts the second roller and an action surface that is inclined with respect to the reaction surface and contacts the first roller; A brake unit comprising a sleeve provided therein, and a push rod that is built into the sleeve in the front-rear direction, is loosely fitted into the front wall of the main body, projects out of the main body, and has a brake shoe connected to its front end, which is pivotally supported by a hanger. The support shafts of the adjusting body extend outward in the left-right direction from the first roller, and third rollers are rotatably provided at the extending portions of these support shafts, and the main body portion below the third rollers is provided in the front-rear direction. A brake unit provided with a guide which the third roller contacts and rotates.