JP4442518B2 - Bogie frame for railway vehicles - Google Patents

Description

  The present invention relates to a railcar bogie frame in which the cross beams formed in a tubular shape are connected by a steel beam welded connecting beam, and the railcar bogie can improve the welding workability of the connecting beam and the reliability of the welded portion. It is about the frame.

  The railcar bogie frame is a strength member that has a very complicated structure and supports high reliability because it supports the vehicle body and a large number of parts in a narrow space. Therefore, in the bogie frame having a steel plate welded structure, it is important to reduce the stress due to the reinforcing ribs, to improve the reliability of the welded portion by improving the welding workability, and to improve the welding workability.

  By the way, at the time of manufacturing the bogie frame, the hem is extended and formed at both side portions of the members to be welded, for example, the connecting beam between the cross beam and the connecting beam. However, it is difficult to perform robot welding because it requires a large amount of weld bead to be welded to form the skirt extended weld, and the welding shape is not simple. Therefore, there has been a problem that many man-hours are required for the welding work.

  In particular, in a cart in which a large load is applied to the connecting beam, the welded joint between the connecting beam and the transverse beam becomes highly stressed, so that it is necessary to carefully finish the hem extension weld A with a grinder as shown in FIG. . In FIG. 7, 1 is a side beam, 2 is a horizontal beam, and 3 is a connecting beam.

In such a bogie frame for a railway vehicle, Patent Document 1 discloses an effective reinforcing structure in a bogie frame having a structure in which a side beam is placed on a horizontal beam with respect to the configuration of the connecting portion of the side beam and the horizontal beam.
Japanese Patent Laid-Open No. 2-179777

  However, this Patent Document 1 discloses only the reinforcing structure in the cart frame having the above structure, and does not disclose any improvement in welding workability and reliability of the welded portion.

  Conventionally, as shown in FIG. 8, the top plate 12a, 13a and the bottom plate 12b, 13b of the cross beam 2 and the connecting beam 3 formed by welding steel plates are integrated to reduce the weld bead amount. There is a bogie frame. However, in the lateral beam 2 formed by welding a steel plate, the welding route portion B exists inside the lateral beam 2, and therefore, it is necessary to perform high skill welding in order to improve the reliability of the welding route portion B. It was.

  The problem to be solved by the present invention is that, in the conventional bogie frame in which two or more cross beams are provided between the side beams, the welding workability in the welded portion of the connecting beam and the cross beam connecting the cross beams and the welding portion It is that no consideration has been given to improving reliability.

The bogie frame for railway vehicles of the present invention is
In order to improve the welding workability in the welded part between the horizontal beam and the connecting beam, and to improve the reliability of the welded part,
In the bogie frame for railway vehicles in which two or more cross beams are provided between the side beams,
The transverse beam is formed in a tubular shape,
And the connecting beam connecting the cross beams,
A vertical member vertically joined between the transverse beams;
The main feature is that this vertical member is composed of a top plate and a bottom plate provided above and below a region surrounded by the two or more horizontal beams among the side beams in such a manner that the horizontal beams are sandwiched from above and below. It is said.

  In the bogie frame for a railway vehicle according to the present invention, the welded joint between the connecting beam and the transverse beam is provided with the top plate and the bottom plate in the entire area between the side beams to eliminate the hem extending weld portion, so that the welding workability is improved and the welding is improved. The reliability can be improved by reducing the stress of the part. In addition, since the welding shape is simplified, welding robotization can be achieved.

  In the bogie frame for a railway vehicle of the present invention, when the horizontal beam is a pipe material and a window is provided in a portion other than the portion in contact with the vertical member of the top plate and the bottom plate, It is also possible to weld with a vertical plate. Therefore, not only the inside of the cross beam but also the welding root portion does not appear on the surface, and the reliability of the welding root portion is improved. This back portion welding is preferably fillet welding from the viewpoint of workability.

  In the present invention, the tube material is not limited to a circular cross section, and may be elliptical or angular as long as it is tubular.

  Further, in the bogie frame for a railway vehicle according to the present invention, the two or more horizontal beams, in which the connecting portion with the side beam is provided with the top plate and the bottom plate and integrated into the side beam, are inserted into the side beam. It is also possible to have a structure in which the transverse beam penetrates the side beam.

  Moreover, if a cover is provided in the window provided between the side beam and the connecting beam of the railcar carriage frame, the connecting beam can have a box structure.

  In the present invention, the hem extending welded portion between the connecting beam and the cross beam connecting portion can be eliminated, so that the welding workability is dramatically improved and the welding reliability is improved by reducing the stress of the welded portion. Further, since the welding shape is simplified, automation by welding robotization can be achieved.

  In addition, when a welding beam on the back side is provided in a portion other than the portion where the horizontal beam is a pipe and the top plate and the bottom plate are in contact with the vertical member, the welding root portion does not appear. Will improve dramatically.

Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS.
FIG. 1 is a view showing a first example of a bogie frame for a railway vehicle according to the present invention, and FIG. 2 is an enlarged view of a main part of FIG. 1, showing a connecting portion between a top plate and a bottom plate constituting a cross beam and a connecting beam. FIG. 3 is a diagram showing an example in which the inventors have conducted a FEM analysis with a single connecting beam, FIG. 4 is a diagram for explaining the stress acting on the connecting beam, and FIG. FIG. 6 is a diagram illustrating a second example of a bogie frame for a railway vehicle according to the present invention, in which a part is regarded as a crack and evaluated by a stress intensity factor.

  FIG. 1 is a bogie frame for a railway vehicle having a structure that penetrates, for example, two lateral beams 2 into a side beam 1, and the two lateral beams 2 made of a pipe having a circular cross section are provided at the side beams at both ends thereof. A portion passing through 1 and including a connecting portion with the side beam 1 is integrally connected by a top plate 4 and a bottom plate 5 described later.

  And in this invention, the aspect which pinches | interposes the vertical member 3a and the said cross beam 2 from the up-and-down direction, the vertical member 3a joined perpendicularly with each said cross beam 2, and the connecting beam 3 which connects between the said two cross beams 2 Thus, the top plate 4 and the bottom plate 5 are provided in the entire area between the two side beams 2. In the first example shown in FIG. 1, the second vertical member 3b is joined at a substantially right angle to the side beam 1 side of the substantially central portion of the vertical member 3a.

  That is, in the first example shown in FIG. 1, in the welded joint portion of the connecting beam 3 and the lateral beam 2, the top plate 4 and the bottom plate 5 are provided in the entire area between the side beams 1. The skirt extension welds that were in the welds between the connecting beams and the side beams are eliminated. Further, since a pipe material is used for the horizontal beam 2, there is no welding root portion inside the horizontal beam 2.

  By adopting such a configuration, it is possible to easily carry out the welding work by eliminating the hem extension weld portion that has been conventionally performed manually. And since a welding shape becomes simple, automatic robot welding can be achieved. Further, by eliminating the skirt extending weld, it is possible to reduce the stress in the weld and improve the reliability of the weld.

  By the way, in the example of the case where there is only one bridging beam 3 shown in FIG. 3, as a result of the FEM analysis by the inventors, the configuration of the present invention in which the skirt extending weld shown in FIG. The stress applied to the welded portion between the connecting beam 3 and the horizontal beam 2 was 70 MPa.

  On the other hand, in the case of the conventional configuration in which the skirt extending weld A shown in FIG. 3B exists, the stress applied to the welded portion of the connecting beam 3 and the cross beam 2 is 93 MPa, and the stress is reduced by about 25%. I understood.

  In the first example shown in FIG. 1, windows 4a, 4b, 5a, 5b are provided in portions other than the portions of the top plate 4 and the bottom plate 5 that are in contact with the vertical members 3a, 3b. By forming the windows 4a, 4b, 5a and 5b, for example, fillet welding of the top plate 4 and the bottom plate 5 and the cross beam 2 is performed not only on the front side visible from the outside, but also on the back side portion as shown in FIG. Can also be done. In FIG. 2, C1 indicates a fillet weld on the front side, and C2 indicates a fillet weld on the back side. Although not shown in FIG. 2, it goes without saying that the back side of the top plate 4 and the bottom plate 5 and the vertical plates 3a and 3b may be welded.

  In order to maintain the workability of the fillet welding on the back side, the distance between the top plate 4 and the bottom plate 5 is preferably 100 mm or more. Further, the top plate 4 and the bottom plate 5 do not necessarily need to be a single plate, and those having different plate thicknesses may be combined and used according to the required strength.

  Thereby, unlike the conventional structure, the welding root portion does not appear on the surface, and the welding reliability of the welding root portion is greatly improved. Specifically, when fillet welding is performed not only on the front side but also on the back side, the length of the welded portion increases from 2x to 3x as shown in FIG. Increases and the stress acting on the connecting beam decreases by 30% or more.

In addition, according to the technique (Vehicle technology, RRR (Railway Research Review) 2001.10, Railway Technical Research Institute, P14-17), the welding cross-section considers the welded unwelded part as a crack and evaluates with the stress intensity factor. Even if the amount is the same, if the backside fillet welding is performed from the definition of the stress intensity factor, as shown in FIG. 5 (a), unwelded corresponds to the case where the crack is inside, so FIG. As shown in (b), the stress intensity factor is 1 / (2 ^1/2 ) compared to the case where the backside fillet welding corresponding to the case where the crack is opened is very advantageous in terms of strength. is there.

  In FIG. 1 described above, all of the welded portions of the connecting beam 3 and the horizontal beam 2 are fillet welded from both the front and back sides, so that the vertical members 3a and 3b of the connecting plate 3 of the top plate 4 and the bottom plate 5 are connected. Windows 4a, 4b, 5a, 5b are provided on both sides.

  However, when it is necessary to form the connecting beam 3 in a box structure, after the bogie frame having the configuration shown in FIG. 1 is manufactured, the side beams 1 of the top plate 4 and the bottom plate 5 are finally formed as shown in FIG. The windows 4a and 5a on the side may be closed with the lid 6 closed. In this case, when there is no problem in the strength of the welding root portion, the windows 4a and 5a on the side beam 1 side of the connecting beam 3 may be closed in advance.

  The above example is merely an example, and the present invention is not limited to the above example, and it goes without saying that the embodiment may be appropriately changed within the scope of the technical idea described in each claim. For example, in the above description, an example in which there are one and two connecting beams 3 is given, but the number of connecting beams 3 is not limited to this. Further, both ends of the horizontal beam 2 may not have a structure penetrating the side beam 1.

  The present invention is not limited to any other configuration as long as it is a bogie frame for a railway vehicle having a structure in which two or more cross beams are provided between the side beams, and any configuration such as a bolster cart or a bolsterless cart is used. It can also be applied to railcar bogies.

It is a figure which shows the 1st example of the bogie frame for rail vehicles of this invention, (a) is a whole perspective view before welding a top plate and a bottom plate, (b) is a whole perspective view before welding a top plate and a bottom plate. FIG. FIG. 1 is an enlarged view of a main part of FIG. 1, (a) is a perspective view seen from above showing a coupling portion of a top plate and a bottom plate constituting a cross beam and a connecting beam, (b) is a side view, and (c) is (b) FIG. In view tie beams originating inventor et al performed FEM analysis showed an example in the case of one, (a) shows the example of the present invention, is a diagram showing a (b) the conventional example. It is a figure explaining the stress which acts on a joining beam, (a) is a figure at the time of fillet welding not only on the front side but the back side, (b) is a figure at the time of fillet welding only on the front side. It is explanatory drawing of the technique which considers the welding cross-section as a crack, and evaluates with a stress intensity factor, (a) is when a crack is inside (when the front and back are fillet welded), (b) is This is when the crack is open (when the fillet is welded only on the front side). It is a figure which shows the 2nd example of the bogie frame for rail vehicles of this invention, (a) is a whole perspective view before covering, (b) is a whole perspective view after covering. It is a figure which shows the example of the bogie frame for the conventional railway vehicles, (a) is a whole perspective view, (b) is the elements on larger scale of a skirt extension welding part. It is a figure which shows the welding example of the horizontal beam and connecting beam of the bogie frame for conventional rail vehicles, (a) is a perspective view, (b) is a side view, (c) is the a section enlarged view of (b) figure, d) is an enlarged view of (c), and is an explanatory view of a welding route portion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Side beam 2 Horizontal beam 3 Connecting beam 3a Vertical member 3b 2nd vertical member 4 Top plate 4a, 4b Window 5 Bottom plate 5a, 5b Window 6 Lid A A tail | end extension welding part B Welding route part

Claims (6)

In the bogie frame for railway vehicles in which two or more cross beams are provided between the side beams,
The transverse beam is formed in a tubular shape,
And the connecting beam connecting the cross beams,
A vertical member vertically joined between the transverse beams;
A railway comprising a vertical plate and a top plate and a bottom plate provided above and below a region surrounded by the two or more horizontal beams among the side beams in a manner sandwiching the horizontal beam from above and below. Bogie frame for vehicles. The transverse beam is a pipe material;
2. The bogie frame for a railway vehicle according to claim 1, wherein a window is provided in a portion other than the portion of the top plate and the bottom plate that contacts the vertical member.   The bogie frame for a railway vehicle according to claim 2, wherein the back side portions of the top plate and the bottom plate are joined by fillet welding. The connecting portion with the side beam is formed by inserting and welding the two or more horizontal beams that are integrated with the top plate and the bottom plate. The bogie frame for railcars according to claim 1 . The connecting portion with the side beam is formed by inserting and welding the two or more horizontal beams that are integrated with the top plate and the bottom plate. The bogie frame for a railway vehicle according to any one of claims 2 and 3 . The bogie frame for a railway vehicle according to any one of claims 2, 3, and 5, wherein a lid is provided on a window provided between the side beam and the connecting beam.

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