JPH04365667A - Bogie frame for railway vehicle - Google Patents

Abstract

PURPOSE:To provide a lightweight bogie frame having a high strength, which may be formed in a simple process, by forming a rectangular shape fiber- reinforced resin pipe having a closed cross-section from two fiber-reinforced resin beam having a U-like cross-sectional shape, which are joined together at their open end sides. CONSTITUTION:For example, pre-pregs in which carbon fibers are laid in one direction are stacked one upon another on the outer surface of a molding die, and are cured so as to from a U-like cross-sectional fiber-reinforced resin beam which is then parted from the die. Further, U-like cross-sectional beam members 2-1, 17, 18, 19 having a linear, U-like, rectangular shape or the like, are joined together at their open sides by means of an epoxy resin group adhesive or the like, so as to form a ladder-like rectangular fiber-reinforced resin pipe. At this stage, one of the beam members may be fitted into or onto the other one thereof so as to form a rectangular fiber-reinforced resin pipe having a fit-in structure. Further, as necessary, H-like reinforcing support plates 10 or the like are arranged in imaginal planes at which the communication hole of the pipe is blocked.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bogie frame for a railway vehicle made of a rectangular tube made of fiber-reinforced resin.

0002

2. Description of the Related Art Generally, the structure of a bogie frame for a railway vehicle is basically an H-shape or a ladder-shape as shown in perspective views in FIGS. 18(1) and 18(2). Figure 18 (1), Figure 1
8(2), 21 indicates a side beam, and 22 indicates a cross beam. Traditionally, steel has been the main material for constructing such railway vehicle bogie frames, but in recent years, the use of aluminum alloys has been considered for the purpose of weight reduction.

Furthermore, in order to reduce the weight of structural members such as bogie frames for railway vehicles, structural members made of fiber-reinforced resin have a much lower specific gravity of 1/5 compared to steel materials, and have high specific strength and specific rigidity. is attracting attention. Moreover, since the structural members often used as fiber-reinforced resin structural members are tubes with a closed cross section, there are many restrictions on providing reinforcement inside the tubes.

[0004] In other words, in order to obtain structures using various fiber-reinforced resin pipes, it is first necessary to manufacture a so-called pipe in which the cross section of the fiber-reinforced resin pipe is a closed cross section. To obtain this with reinforced resin, the usual procedure is to form a layer of fiber-reinforced resin around the outer periphery of a molding die, and then pull out the molding die in the axial direction of the tube.
The operation was complicated. Furthermore, all of the beams are composed of square beams having a U-shaped closed cross section, and the side beams and the cross beams are connected at right angles.

The most common method for this connection is to make a hole in the side surface of the side beam and pass the cross beam through the hole for connection. Additionally, there is a method of connecting the side beam 31 and the cross beam 32 using a three-pronged so-called T-shaped pipe joint 33, as shown in FIG. 19, or a method of continuously integrally molding the side beam and the cross beam. Ta.

[0006]

[Problems to be Solved by the Invention] In this method of making a hole in the side wall surface of a pipe and passing the other pipe through it for connection, reinforcing fibers are not continuously arranged between each of the intersecting beams. However, since the reinforcing fibers were cut at the joints, there was a problem in that the strength of the intersections was significantly poor.

[0007] Furthermore, according to a method in which a so-called T-shaped joint is used and a straight pipe is inserted into the joint and connected, the reinforcing fibers constituting the joint are arranged continuously at the intersection. Not only does the weight of the joint itself increase, but also the T
It took a lot of effort to make the shape of the joint. on the other hand,
Methods such as continuous integral molding of side beams and cross beams without using or connecting T-shaped joints have been problematic in that they require a great deal of effort.

[0008] Further, since square tubes having a rectangular cross section, which are often used as structural members, have a closed cross section, there are many restrictions on providing a reinforcing support plate inside the tube. For example, conventional methods for improving the rigidity and strength against bending loads in square pipes include filling the inside of the pipe with a filler or providing support in the vertical direction inside the pipe, as disclosed in Japanese Patent Laid-Open No. 62-2649.
This method of providing a reinforcing support plate in the communication hole inside the pipe, which was already proposed in Publication No. 35, requires a continuous reinforcing support plate in the axial direction of the pipe due to the structure that the cross section of the pipe is a closed cross section. There was no choice but to provide it in the communicating hole of the pipe along the axial direction of the pipe.

[0009] Therefore, the present invention solves the above-mentioned problems.
It is an object of the present invention to provide a bogie frame for a railway vehicle that is lightweight, has high rigidity and strength, has high resistance to bending loads, and has particularly high strength at intersections where beams intersect.

0010

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a U-shaped beam made of fiber-reinforced resin and having an upper surface, side surfaces, and lower surface, and an open cross section with one side open. Using two or more members, with the open sides facing each other,
The upper and lower surfaces of one U-shaped beam member are overlapped with the upper and lower surfaces of the other U-shaped beam member to form a closed cross-section, and the tube is made of a fiber-reinforced resin square tube. This is a bogie frame for railway vehicles.

The present invention also provides a bogie for a railway vehicle in which a reinforcing support plate is provided on a virtual plane that blocks the communication hole of a rectangular pipe made of fiber-reinforced resin having a closed cross section, thereby increasing the bending strength. It is used as a frame. Furthermore, the present invention provides a bogie frame for a railway vehicle using a rectangular tube made of fiber-reinforced resin with carbon fiber as the reinforcing fiber.

[0012] The reinforcing support plate is oriented in a direction that blocks the communication hole of the pipe, and can be provided obliquely to the axis of the pipe, but usually this reinforcing support plate is oriented on the inner surface of the wall constituting the pipe. Preferably, they are arranged perpendicular to each face, ie perpendicular to the axis of the tube. The quantity and contents of the reinforcing support plate are determined after assembly.
Depending on the use and load of the fiber-reinforced resin rectangular tube of the present invention, they are provided at arbitrary intervals. This reinforcing support plate may be simply flat, but from the viewpoint of increasing the adhesive surface and reinforcing effect,
For example, it is preferable to have an H-beam shape or an I-beam shape like the reinforcing support plate 10 shown in FIG.

Here, the dimensions of one U-shaped beam member in the vertical direction are such that it can fit into the open groove of the other U-shaped beam member. Using each of these U-shaped beam members, connect the open sides facing each other and the top and bottom surfaces of one U-shaped beam member to the top and bottom surfaces of the other U-shaped beam member. A closed cross section is formed by overlapping each other to produce a rectangular fiber-reinforced resin tube of the present invention.

[0014] The mechanical strength of the overlapping upper surfaces or lower surfaces is increased by joining them. This connection includes
In addition to adhesive bonding, mechanical bonding such as bolts and rivets is possible, and these can be used together.
Furthermore, in order to strengthen this bond, it is also possible to provide a fiber-reinforced resin layer on the outer or inner surface of the tubular body after bonding.

[0015] Further, if necessary, the joint portion between the upper and lower surfaces of the U-shaped member can be tapered or stepped as shown in Figs. 17 (1) and (2). Furthermore, the external shape of the U-shaped member is not limited to a straight line, but may be an L-shape, a U-shape, a V-shape, or any other appropriate shape. As the closed cross-sectional shape of the fiber-reinforced resin tubular structural member of the present invention, not only the quadrilateral shape shown in the cross-sectional view in FIG. 20(1) but also the octagonal shape shown in the cross-sectional view in FIG. 20(2) are used. can do.

The U-shaped beam member made of fiber-reinforced resin used in the present invention can be obtained, for example, by a known lay-up process on a mold. The external shape of the U-shaped beam member can be linear, L-shaped, U-shaped, or any other suitable shape. As the reinforcing fibers of the fiber-reinforced resin used in the present invention, carbon fibers with high specific strength and specific modulus are preferable, but other reinforcing fibers can be used or used in combination as necessary. On the other hand, there are no particular restrictions on the resin, and any resin that can take advantage of the characteristics of reinforcing fibers can be used.

The U-shaped beam member constituting the fiber-reinforced resin square tube of the present invention is manufactured, for example, by the following method. High-strength type carbon fiber (for example, manufactured by Toho Rayon Co., Ltd.,
An epoxy resin prepreg (curing temperature: 130° C.) made of unidirectionally aligned epoxy resin prepreg (curing temperature: 130° C.) is laminated by layup on the outer surface of a molding die, and the resin is cured to form a fiber-reinforced resin layer. Thereafter, the fiber reinforced resin layer is removed from the mold. The form of the layup is selected depending on the characteristics of the intended fiber-reinforced resin square tube using prepreg such as unidirectional material, woven material, non-woven material, random web material, etc.

FIGS. 7 to 11 show the molds 1-1, 1-2, 1-3, 19, and 20 for molding the U-shaped beam member of the present invention with fiber-reinforced resin layers molded and cured. FIG. 12 to 15 show a U-shaped beam member element 2 obtained by molding, curing, and demolding by the method shown in FIGS. 7 to 11.
-1, 2-2, 2-3, 17, and 18 are shown. The U-shaped beam member 2 obtained by demolding is the straight U-shaped beam member 2-1 shown in FIG. 12 from the molding die 1-1 shown in FIG. The L-shaped U-shaped beam member 2-2 shown in FIG. 13 is produced from the molding die 1-2 shown in FIG. The U-shaped beam member 2-3 is formed from the molding mold 19 shown in FIG. 10 and the molding mold 20 shown in FIG. Square-shaped and U-shaped beam members 18 are obtained, respectively.

As shown in 11 to 13 in FIG. 1, the U-shaped beam members are overlapped and joined to obtain a tubular structural member with a closed cross section. The meshing of each U-shaped beam member is performed by adjusting the distance between the upper and lower surfaces of one U-shaped beam member element to that of the other U-shaped beam member element, as shown in 11 and 12 in Fig. 1. The distance between the top and bottom surfaces of each U-shaped beam member may be larger than the distance between the top and bottom surfaces, and the space between the top and bottom surfaces of each U-shaped beam member may be set so that one fits exactly into the other. They may be the same, and may also have an interlocking structure.

[0020]

[Function] As described above, the railway vehicle bogie frame of the present invention, which is made of a rectangular fiber-reinforced resin tube with a closed cross section, is formed by combining a plurality of U-shaped beam members. In order to manufacture a U-shaped beam member, there is no need to pull out the molding die from the axial direction of the tubular structural member, and in order to produce a tubular structural member with a closed cross section, multiple U-shaped beam members are required. The shaped beam members can be manufactured by overlapping each other with their open sides facing each other and the top and bottom surfaces of one U-shaped beam member overlapping the top and bottom surfaces of the other U-shaped beam member. Therefore, it is easy to manufacture.

[0021] Furthermore, when the rectangular fiber-reinforced resin tube with a closed cross section of the present invention is used as a bogie frame for a railway vehicle, the upper and lower surfaces thereof are each made of double fiber-reinforced resin members. Therefore, it has high strength and high resistance to bending loads. Furthermore, when the fiber-reinforced resin rectangular tube of the present invention having a branched shape such as a T-shape is used as a bogie frame for a railway vehicle, it is composed of, for example, two L-shaped members and one rod-shaped member. The fiber-reinforced resin is continuous at the T-shaped right-angled joints, and the joints of each member are doubled, so it has high strength and high resistance to bending loads.

Furthermore, the railway vehicle bogie frame made of the fiber-reinforced resin rectangular tube of the present invention has a reinforcing support plate in the communication hole inside the rectangular tube to block the communication hole. , exhibits high rigidity and strength and high performance against bending loads.

[0023]

[Embodiment 1] An embodiment of the present invention will be described based on FIGS. 1 and 2. FIG. 1 conceptually shows a perspective view of a rectangular fiber-reinforced resin tube used in a bogie frame for a railway vehicle according to the present invention. FIG. 2 conceptually shows an exploded perspective view of the fiber-reinforced resin square tube of the present invention before assembly.

In FIG. 1, the fiber-reinforced resin square tubes 11 to
13 has a top surface, a side surface, and a bottom surface, and one side is open.
It is manufactured by combining two U-shaped beam members with open cross sections. The side surfaces of the fiber-reinforced resin square tubes 11 and 13 are flat, and the side surfaces of the fiber-reinforced resin square tube 12 are curved. Each U-shaped beam member is made of fiber-reinforced resin, has a parallel top surface and a bottom surface, and is integrally formed with the top surface, side surfaces, and bottom surface continuous.

First, fiber-reinforced resin square tubes 11 and 1
2 will be explained. As shown in FIG. 2, the open sides face each other, and the upper and lower surfaces of one U-shaped beam member 3-1 are overlapped with the upper and lower surfaces of the other U-shaped beam member 3-2. The overlapping portions are then joined using an adhesive. In the fiber-reinforced resin square tube 11 or 12, one U-shaped beam member 3-1 or 4-1 overlaps the other U-shaped beam member 3-1 or 4-1. The distance between the upper and lower surfaces is larger than that of the character-shaped beam member 3-2 or 4-2, and the two are combined so that one just fits into the other. Then, by joining the overlapping portions with an adhesive (for example, epoxy adhesive), the fiber-reinforced resin square tubes 11 and 1 are bonded together.
Get 2.

Next, another square tube 13 made of fiber-reinforced resin will be explained. The fiber-reinforced resin square tubes 11 and 1
The difference from No. 2 is that the intervals between the upper and lower surfaces of each U-shaped beam member 5-1 are the same, and the upper and lower surfaces of each other have an interlocking structure.

[0027]

Embodiment 2 FIG. 3 shows an exploded perspective view of a rectangular fiber-reinforced resin tube according to another embodiment of the present invention before assembly. FIG. 4 shows a cross-sectional view of the fiber-reinforced resin square tube shown in FIG. 3. In FIG. 3, 6 and 7 are both U-shaped beam members, and the open groove 8 of the U-shaped beam member 6 and the open groove 9 of the U-shaped beam member 7 are such that their open sides face each other. It is arranged. The interval 14 between the upper and lower surfaces of the U-shaped beam member 6 is slightly smaller than the interval 15 between the upper and lower surfaces of the U-shaped beam member 7, so that the U-shaped beam member 6 just fits into the open groove 9. To,
designed and manufactured.

The open groove 8 of the U-shaped beam member 6 in FIG. perpendicular to the direction, H
Three beam-shaped reinforcing support plates 10 are provided at intervals. The U-shaped beam member 6 is housed in the open groove 9 of the U-shaped beam member 7, and the upper and lower surfaces of the U-shaped beam members are overlapped and joined together with an adhesive to be integrated. ing.

As shown in FIG. 4, the fiber-reinforced resin square tube of the present invention has a reinforcing support plate 1 that looks like a "bamboo knot".
0 is arranged on an imaginary plane that blocks the communication hole of the rectangular fiber-reinforced resin tube.

[0030]

[Embodiment 3] Another embodiment of the present invention will be described based on FIGS. 5 and 6. FIG. 5 schematically shows a perspective view of a T-shaped fiber-reinforced resin square tube used in the bogie frame for railway vehicles of the present invention. FIG. 6 schematically shows a perspective view of the U-shaped beam member before the T-shaped fiber-reinforced resin square tube shown in FIG. 5 is assembled. As shown in FIG. 6, a straight U-shaped beam member 2-1, an L-shaped U-shaped beam member 2-
2. Using the L-shaped U-shaped beam member 2-3, first, the L-shaped U-shaped beam member 2-3 and another L-shaped U-shaped beam member 2-2. were glued together with their open sides facing each other.

In this case, as shown in the joint sectional view of an L-shaped U-shaped beam member and another L-shaped U-shaped beam member in FIG. It is also possible to eliminate the difference in level between the surfaces of the U-shaped beam members by providing a taper or providing a stepped portion to the bonding surfaces of the U-shaped beam members. Next, the joined body is attached to the linear U-shaped beam member 2-
1 and the overlapped portions were adhesively bonded using an epoxy resin adhesive to obtain a T-shaped fiber-reinforced resin rectangular tube shown in FIG. 5.

[0032] The T-shaped fiber-reinforced resin square tube of this example was extremely lightweight and had particularly high strength at the beam joints.

[0033]

[Embodiment 4] Still another embodiment of the present invention will be described based on FIG. 16. FIG. 16 is an application example in which the shape of the conventional railway vehicle bogie frame shown in FIG. 18(2) is formed using the U-shaped beam member of the present invention. As shown in FIG. 16, centering around a U-shaped beam member 18 with a square-shaped exterior, a U-shaped beam member 17 with a U-shaped exterior is placed in the outer open groove on two opposing sides. The three joined U-shaped beam members 17, 18, 17 are fitted together and bonded with adhesive, and then a straight U-shaped beam member is attached so that the outer side beam portions of the three joined U-shaped beam members 17, 18, 17 are joined together. 2-1 and 2-1 were fitted and adhesively bonded to complete the side beam, and a ladder-shaped railway vehicle bogie frame shown in FIG. 18(2) was obtained.

[0034]

[Effects of the Invention] As explained in detail above, according to the present invention, the fiber-reinforced resin square tube of the present invention is constructed by combining two or more U-shaped beam members separated in the axial direction. Therefore, when removing the U-shaped beam member from the molding die,
There are no restrictions on the direction of demolding, and manufacturing is easy.

Furthermore, since the fiber-reinforced resin square tube used in the present invention is made of fiber-reinforced resin, it is lightweight and has high rigidity and strength, and the upper surface of the U-shaped beam member is Since the lower surfaces are formed by joining each other in two layers, it has excellent resistance to bending loads. Furthermore, the bogie frame for a railway vehicle of the present invention is made of fiber reinforced resin having a closed cross section composed of U-shaped beam members each having a linear, L-shaped, U-shaped, or V-shaped external shape. Since it is made using square pipes, the fiber-reinforced resin is continuously formed at the branching parts, making it stronger and lighter than those using conventional pipe fittings. .

Furthermore, the railway vehicle bogie frame made of the fiber-reinforced resin rectangular tube of the present invention has a reinforcing support plate in the communication hole inside the rectangular tube to block the communication hole. , exhibits high rigidity and strength and high performance against bending loads.

[Brief explanation of drawings]

FIG. 1 schematically shows a perspective view of a rectangular fiber-reinforced resin tube used in a railway vehicle bogie frame of the present invention.

FIG. 2 schematically shows an exploded perspective view of a rectangular fiber-reinforced resin tube used in a railway vehicle bogie frame of the present invention before assembly.

FIG. 3 shows an exploded perspective view of a rectangular fiber-reinforced resin tube having a reinforcing support plate therein for use in a railway vehicle bogie frame of the present invention before being assembled.

FIG. 4 shows a cross-sectional view of a rectangular fiber-reinforced resin tube having a reinforcing support plate inside.

FIG. 5 shows a perspective view of a T-shaped rectangular fiber-reinforced resin tube used in the bogie frame for railway vehicles of the present invention.

FIG. 6 shows an exploded perspective view of the T-shaped fiber-reinforced resin square tube shown in FIG. 5 before assembly.

FIG. 7 is a perspective view showing a state in which a fiber-reinforced resin layer is formed in a mold for forming a U-shaped beam member having a linear appearance.

FIG. 8 is a perspective view showing a state in which a fiber-reinforced resin layer is formed in a mold for forming a U-shaped beam member having an L-shaped appearance.

FIG. 9 is a perspective view showing a state in which a fiber-reinforced resin layer is formed in a mold for forming a U-shaped beam member having an L-shaped appearance.

FIG. 10 is a perspective view showing a state in which a fiber-reinforced resin layer is formed in a mold for forming a U-shaped beam member having a U-shaped appearance.

FIG. 11 is a perspective view showing a state in which a fiber-reinforced resin layer is formed in a mold for forming a U-shaped beam member having a square-shaped appearance.

12 shows a U-shaped beam member having a linear appearance and molded by the molding die shown in FIG. 7; FIG.

[Fig. 13] The appearance molded by the molding die shown in Fig. 8 is L.
A U-shaped beam member is shown.

[Fig. 14] The appearance molded by the molding die shown in Fig. 9 is L.
A U-shaped beam member is shown.

FIG. 15 shows a U-shaped beam member having a U-shaped appearance and a U-shaped beam member having a C-shaped appearance, both molded by the molding molds of FIGS. 10 and 11;

FIG. 16 shows a U-shaped beam member before assembly of a bogie frame for a railway vehicle according to an embodiment of the present invention.

FIG. 17 shows a joint sectional view of an L-shaped U-shaped beam member 2-3 and another L-shaped U-shaped beam member 2-2.

FIG. 18 shows the appearance of a bogie frame for a railway vehicle.

FIG. 19 shows a conventional railway vehicle bogie frame using a T-shaped pipe joint.

FIG. 20 shows an example of a closed cross-sectional shape of a rectangular fiber-reinforced resin tube used in a railway vehicle bogie frame of the present invention.

[Explanation of symbols]

1-1, 1-2, 1-3, 19, 20
Molding mold 2-1, 2-2, 2-3, 3-1, 3-2, 4-1, 4
-2,5-1,6,7,17,18
U-shaped beam members 8, 9
Open groove 10

Reinforcement support plates 11, 12, 13
Fiber-reinforced resin square tube

Claims (3)

[Claims] Claim 1: Using two or more U-shaped beam members made of fiber-reinforced resin each having an upper surface, a side surface, and a lower surface and having an open cross section with one side open, the open sides facing each other,
The upper and lower surfaces of one U-shaped beam member are overlapped with the upper and lower surfaces of the other U-shaped beam member to form a closed cross-section, and the tube is made of a fiber-reinforced resin square tube. Bogie frame for railway vehicles. 2. The bogie frame for a railway vehicle according to claim 1, wherein a reinforcing support plate is disposed on a virtual plane that blocks the communication hole of the rectangular fiber-reinforced resin tube having a closed cross section. . 3. The bogie frame for a railway vehicle according to claim 1, wherein the reinforcing fibers constituting the rectangular fiber-reinforced resin tube are carbon fibers.