JPS6124222B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bogie for a railway vehicle that provides an axial shock absorbing capacity to an axle box for a railroad vehicle that cannot provide a shock absorbing effect inside the bearing.

Figures 1 and 2 schematically show the structure of an axle box generally used in railway vehicles, where 1 is an axle, 2 is a cylindrical roller bearing, 3 is an inner ring of the cylindrical roller bearing 2,
4 indicates the outer ring of the cylindrical roller bearing. The inner ring 3 is shrink-fitted and fixed to the axle 1, and the outer ring 4 is inserted and fixed to the axle box 5. An angular contact bearing 6 is attached to the tip of the axle 1, an axial buffer rubber 8 is provided via a presser plate 7, and a front cover 9 is attached to the front surface of the axial buffer rubber 8. A slinger 11 is attached to the rear end of the axle 1, and an oil seal 10 (including a dust seal) attached to a rear cover 18 has a sealing action to prevent lubricating grease from leaking. An inner flange 16 and an outer flange 17 are attached to the axle box body 5, and by sliding in contact with a horn block 15 fixed to a seat 14 attached to the bogie underframe 13, It is designed to be able to run while maintaining a specified position. The vertical cushioning of the axle box is normally provided by the damping action of an axle spring attached to the upper side of the axle box body 5. However, the bogie underframe 1 is very closely related to wheel axle derailment, etc.
The buffer in the axial direction of the wheel axle between 3 and the wheel axle is shown in Figure 1.
In the axle box having the configuration shown in FIG. 2, the cylindrical roller bearing 2 allows the inner ring and outer rings 3, 4 to move freely in the axial direction due to the displacement during rolling of the cylindrical roller bearing 2 in the axial direction, and at the same time allows the cylindrical roller bearing 2 to move freely in the axial direction. After providing some play at the Yuler contact bearing 6, a cushioning effect is provided by pressing the cushioning rubber 8 through the holding plate 7. As described above, since there is a buffering effect in the wheel axis direction inside the axle box, no problem will occur even if no buffering effect is provided between the axle box and the bogie underframe 13.

Next, the configuration shown in FIG. 3 shows a structure in which an axle box support 19 is attached to an underframe 13a, and an axle box body 5a is guided via an axle box guard rubber 20. In this case, the axle box guard rubber is made soft for vertical and lateral movement of the axle box, but hard for movement in the direction of travel of the vehicle. In such a case, the trolley frame 13a,
Since the axle box body 5a has a shock absorbing effect in the wheel axle direction, there is no need to provide a wheel axle direction buffer within the axle box, and the buffer rubber 8 and presser plate 7 shown in FIG. 1 are not provided. First, there are cases where the angular contact bearing 6 is directly held by the front cover 9.

Recently, efforts have been made to rationalize maintenance of railway vehicles by creating a structure that allows the axle box to function satisfactorily without maintenance. Sealed RCT
There is a movement toward the use of a type of bearing. This RCT bearing is composed of an indirect mount tapered roller bearing, but in addition, as shown in Fig. 4, a cylindrical roller bearing with a collar 2a
By using the inner ring 3a, outer ring 4a, and oil seal 21, it is possible to incorporate a maintenance-free bearing into the axle box body 5b, which has approximately the same external shape as the conventional axle box body 5. being done. However, since such an RCT bearing or a cylindrical roller bearing with a collar 2a shown in FIG. Otherwise, there is a risk that the lateral pressure on the flange will increase during running, leading to derailment. However, if the bogies of vehicles that have been manufactured in large numbers were to be significantly modified just for this purpose, it would result in a huge loss apart from the goal of maintenance-free, and the conventional bogies would be completely modified. Incorporating this new maintenance-free bearing without any additional costs has come to be considered a major theme in the rationalization of railways.

One example of this is to attach a cushioning rubber 22 as shown in FIG.
It has been proposed to install it at a position with sufficient clearance from a. However, if the space of the conventional inner collar 16a is used, the area is extremely small, so the surface pressure of the cushioning rubber 22 increases.
Also, when the axle box body 5b slides up and down, the slide plate 23 of the buffer rubber 22 that contacts the horn block 15a is pulled up and down, and the buffer rubber 22 breaks and the slide plate 23
This is completely contrary to the purpose of eliminating the need for maintenance, as it would be inappropriate for the vehicle to continue running if the mechanism were to fall, and there is a danger that the mechanism would become more labor-intensive.

This invention was made in view of the above circumstances, and by incorporating an axle box that provides a buffering effect in the wheel axle direction into a bogie structure that cannot provide a buffering effect between the bogie frame and the axle box, it is possible to improve the structure of the bogie. The purpose of the present invention is to provide a bogie for a railway vehicle equipped with a highly safe axle box that does not require any particular modification of the underframe.

An embodiment of the present invention will be described below with reference to FIGS. 6 to 10.
This will be explained with reference to the figures. First, Figure 6 shows the axle box body 5c.
27 is the front and rear lid tightening bolts, and 30 is the sliding surface with the horn block of a normal axle box body. For the axle box body, in order to ensure the wall thickness of the axle box body diameter portions 37 and 24 that receive the bearing outer ring, 2.
The wall thickness at part 5 is thick, although it is unnecessary. However, in the case of this invention, 26a,
As shown in 26b, the wall thickness of 25 is partially cut off to the minimum required size, and the cushioning rubber sliding plate 28 that provides axial cushioning for the axle box is expanded diagonally, and the cushioning rubber 33 described later and the The axle box tightening bolt 27 is configured to pass through a through hole 29 provided in the attached slide plate 28.

Figure 7 shows the shaved parts 26a, 26 of this axle box body.
In the perspective view showing the relationship between the axle box body 5c and the axle box body 5c, the cut-off portions 26a and 26b are provided only in the vicinity of the inner flange 16a of the axle box body 5c, and the through holes 31a and 31b of the tightening bolts 27 are integrally formed. It has been machined to penetrate through it. A hole 32 provided on the rear side of the inner collar 16a has a bolt hole for attaching a buffer rubber 33. Therefore, it can be seen that the effective portion of the sliding surface 30 that slides on the horn block 15 of the axle box body 5c is hardly reduced.

Figure 8 shows the structure of a single buffer rubber that provides this buffering function.
3. It consists of a back plate 34, and the tightening bolt through hole 29 is attached to the protruding part.

Next, Figure 9 shows the truck underframe 13 and horn block 1.
5, an inner collar 16a, an axle box body 5c, an outer collar 17a at the center portion as shown in 24 in FIG.
It is a partially sectional plan view showing the relationship of the cushioning rubber mechanism. The back plate 34 is fixed to the axle box body with the mounting bolts 35 to the inner brim 16a, and the axle box body 5c can slide up and down by the action of the buffer rubber 33 and the slip plate 28, and at the same time can also be cushioned and displaced in the axle axis direction. It is.

Next, FIG. 10 is a partial sectional view of the tightening bolt 27, in which the tightening bolt 27 passes through the slide plate 28 and the buffer rubber 33, and the sliding surface of the bolt 30 faces the horn block 15. are doing. Here, Figure 9,
In both Figures 10, the outer collar 17a is the horn block 1.
Although the outer flange 17a is shown as being arranged with a certain gap from the outer flange 17a, it is not necessarily necessary, but it is used to act as a stopper in the event that a large lateral displacement of the axle box occurs due to some abnormality. It is preferable from the viewpoint of safety to attach it to the

Next, to explain the function of this axle box with a shock absorber, the axle box sliding surface 30 and the horn block 15
The vertical guiding action is completely the same as that of the conventional single-transport sliding plate type axle box guard, but the axial cushioning between the axle box body 5 and the bogie underframe 13 is achieved by the cushioning rubber action attached to the inner collar 16a. It is clear that it will work. However, since the buffer rubber 33 extends into the portions 26a and 26b which are cut off diagonally from the axle box body, and the tightening bolts 27 pass through them, the following advantages not available in the past are achieved. It is possible to obtain. In other words, since the area of the buffer rubber 33 is greatly expanded, the rubber surface pressure can be lowered, which is very advantageous in terms of life. 2
7 restrains it in the vertical and front-back directions, and the cushioning rubber 3
Since it is guided only in the compression direction of 3, when the axle box is displaced up and down while receiving a large axial thrust from the wheel set, this guiding action causes the shock absorber rubber 33 to
Since no shearing deformation or shearing stress occurs at all, it is possible to fully guarantee the life of the buffer rubber 33. Also, even if the cushioning rubber 33 itself is manufactured with sufficient care, it is impossible to completely prevent troubles such as peeling off of the adhesive part with the pickpocket plate or backing plate, or poor rubber quality. Therefore, it must be designed so that it can continue to run even if trouble occurs. In this respect, since the pickpocket plate 28 is held by the tightening bolt 27, even if the buffer rubber 33 is completely cut, there is no risk that the pickpocket plate 28 will fall and cause secondary abnormalities. . Thinking about it this way, if a part of the axle box body is shaved off and a tightening bolt is used to hold the slip plate in a manner that does not impair the cushioning effect, it is possible to create a space between the axle box and the bogie underframe 13. It becomes possible to provide a highly reliable shock absorbing mechanism, and it is possible to provide a bogie for railway vehicles that requires no maintenance of bearings in the axle box.

In addition, as an embodiment of the present invention, in order to reduce the wear due to mutual sliding between the slotted plate 28 and the tightening bolt 27, a method and structure are provided in which the guide portion is made larger or longer so as to increase the contact area between the slotted plate 28 and the bolt 27. Alternatively, in addition to changing the rubber mold to avoid metal contact, in the embodiment of the present invention, the slide plate 28 is held using a tightening bolt 36 that tightens and fixes the front cover 9 and the rear cover 18. However, it is possible to consider many modifications, such as separating the bolts that hold the slide plate 28 and fixing the front cover 9 and the rear cover 18 with individual short bolts.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the axle box structure for general railway vehicles.
Figure 2 is a sectional view showing the axle box guard structure when the axle box shown in Figure 1 is assembled into a bogie, and Figure 3 shows the axle box guard structure that has a buffer function in the wheel axis direction between the bogie underframe and the axle box. 4 is a cross-sectional view showing the structure of an axle box that does not have a buffer function in the axial direction within the axle box, and FIG. 5 is a cross-sectional view showing the axle box of the type shown in FIG. FIG. 6 is a cross-sectional view showing the structure of the shock absorbing mechanism when assembled; FIG. 6 is a cross-sectional view of the axle box axial shock absorber according to the present invention as seen from the front; FIG. 7 is a perspective view showing the structure of the axle box body according to the present invention. , FIG. 8 is a perspective view of the cushioning rubber, and FIGS. 9 and 10 are partial sectional views of the central part and the tightening bolt part showing the attachment relationship of the cushioning rubber between the bogie underframe and the axle box body. . 1, 1a...Axle, 2...Cylindrical roller bearing, 3,
3a...Inner ring, 4, 4a...Outer ring, 5, 5a, 5
b, 5c...Axle box body, 6...Angular contact bearing, 8...Buffer rubber, 9...Front cover, 1
0,21...oil seal, 13...bogie underframe,
15, 15a... Horn block, 16, 16a
...Inner collar, 17, 17a...Outer collar, 2
2, 33... Buffer rubber, 26a, 26b... Scraped portion, 27... Tightening bolt, 28... Slip plate,
30...Sliding surface, 29, 31a, 31b...Tightening bolt through hole, 34...Back plate.

Claims (1)

[Claims] 1. For axle boxes that do not have a shock absorbing function in the axial direction of the wheel axle inside the axle box and are combined with a pickpocket type axle box guard with cushioning rubber placed outside the axle box, a part of the axle box Scrape off the rubber so that it does not affect the internal structure of the bearing, etc., place the cushioning rubber so that it fits into the scraped part, and cushion the penetrating object such as a tightening bolt or a member with the same function. A railway vehicle bogie incorporating a wheel shaft axial shock absorbing mechanism that combines a rubber horn block on the bogie side and a sliding slide plate.