JP3264977B2 - Bogie frame for railway vehicles and magnetic levitation vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bogie frame of a vehicle used for a magnetic levitation vehicle running on a track or a railroad vehicle running on a rail and supporting a vehicle body.

[0002]

2. Description of the Related Art In general, a bogie frame of a railroad vehicle running on a rail is provided with a pair of side beams 1 as shown in FIGS.
1 and the front and rear wheel shafts 3 and 4 are respectively bridged between the center portion and the front end portion and the rear end portion thereof. It was constituted by interposing a shaft spring 5 as a device. The torsion caused by the irregularities of the rails is absorbed by the deflection of the shaft spring 5 and the bogie frame itself (for example, see Japanese Unexamined Patent Publication No.
143257).

On the other hand, in the case of a superconducting magnetic levitation vehicle running on a track, a set of levitation traveling superconducting magnets (electromagnets) is mounted on each of the left and right sides of a bogie frame supporting the vehicle body. As shown in FIG. 14, an electromagnet 8 is rigidly connected to a side surface of a bogie frame 6 via a connecting body 7 (for example, see Japanese Patent Application Laid-Open No. 55-132360), or as shown in FIG. Electromagnet 8 on the side of frame 6
Are elastically supported via a link 9 and a magnet supporting spring (primary spring) 10 (for example, see Japanese Unexamined Patent Application Publication No.
176266) is generally known. Then, the vehicle body 11 is mounted on the upper surface of the bogie frame 6 with a pillow spring (secondary spring) 1.
It was made to elastically support through 2.

[0004]

However, in the bogie frame of a railway vehicle in the above-mentioned conventional example, the torsion caused by irregularities of the rails is absorbed by two operations (deformation) such as a shaft spring and bending of the bogie frame itself. Because it was
It was structurally complicated and it was difficult to achieve significant weight reduction.

On the other hand, in the former case of the magnetic levitation vehicle, since the bogie frame is rigidly connected to the electromagnet, the vibration of the electromagnet is directly transmitted to the bogie frame for levitation traveling, which is a space for mounting various precision equipment. Not only is this vibration quite intense, but also the torsional load generated by the irregularities of the running track enters the bogie frame as it is, so a bogie frame with high rigidity and strength is required, and the bogie frame itself becomes heavy. Would.

In the latter case, since the left and right electromagnets are connected to the bogie frame via a link, the tensile and compressive forces in the left and right directions act directly on the bogie frame, and the bogie frame responds accordingly. However, there is a problem that it is necessary to provide a large number of links and their receivers for connecting the electromagnets, and it is difficult to simplify the structure and achieve a significant weight reduction.

[0007] In view of the above, the present invention provides a structure which has the flexibility to follow up and down irregularities of tracks and rails, is relatively simple in structure, and is capable of significantly reducing weight. The purpose is to:

[0008]

Means for Solving the Problems To achieve the above object,
Therefore, the bogie frames of the railway vehicle according to the present invention
A pair of left and right side beams extending parallel to the
Oriented fiber reinforced plastic veneer
Are stacked differently to form a flat plate
And between the upper and lower portions at the front end of the side beam.
Between the top and bottom at the rear end of the side beam
So that the thickness direction is the vertical direction
A leaf spring extending in the left-right direction, and the pair of left and right side
And in the space of the lower frame constituted by the leaf spring
And a pair of left and right side beams,
It is interposed between the vehicle body support frame suspension the vehicle body supporting frame
And an air spring to be mounted.
You.

Further , the bogie frame of the magnetic levitation vehicle of the present invention includes:
Equipped with electromagnets on the left and right sides to support the car body running on the track
Frame of a magnetically levitated vehicle that has the function of an electromagnet
Left, which are parallel to each other in the front-rear direction
Fiber reinforced with a pair of right side burrs and fibers oriented in one direction
Plastic veneers are stacked so that their fiber directions are different.
Layered and formed into a flat plate, and in front of the side beam
Between the upper and lower ends and the rear end of the side beam
Between the upper and lower sections of the
Extends in the horizontal direction so that its thickness direction is the vertical direction
A leaf spring, the pair of left and right side beams and the leaf spring.
Body with its lower part stored in the space of the lower frame composed of
A support frame, the pair of left and right side beams and the vehicle body support frame.
An air spring interposed between and suspending the vehicle body support frame;
It is characterized by having.

[0010]

In the present invention configured as described above,
Spans a pair of left and right side beams extending parallel to each other in the direction
The reinforced leaf spring has a fiber reinforced plate with fibers oriented in one direction.
Laminated veneer laminated with different fiber directions
And the plate is shaped like
It is arranged to extend in the left and right direction so as to be downward.
You. This allows these leaf springs to have their cross-sectional shape and
Due to the inherent anisotropy of the composite material, it is easy to bend vertically, but
It can be set to be hard in the backward direction. Soshi
And use the leaf spring set in this way as a side
By forming the lower frame of the bogie frame, the traveling track or rail
Strong against shear deformation in the horizontal plane against the strip, but vertical
Can flexibly cope with torsional deformation of
The strength against the tensile and compressive force acting in the right direction is
Can be secured by the
The structure can be simplified and the weight can be reduced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 5 show a first embodiment applied to a magnetic levitation vehicle running on a track. In this embodiment, a pair of side beams 20, which are constituted by superconducting magnets (electromagnets), are used. 20 are provided, and these side flashes 20, 2 are provided.
Between the front ends of the 0, two front side plates 21 and 21 are provided.
The lower frame 23 is formed between the rear end portions by bridging the upper and lower two rear horizontal beams 22, 22, respectively.

Each of the horizontal bars 21 and 22 is made of a carbon fiber reinforced plastic (hereinafter referred to as CF) having fibers oriented in one direction.
RP) is formed by a CFRP leaf spring formed by laminating single plates (unidirectional materials) of different fiber orientations. That is, in this embodiment, each of the above-mentioned sideways (CFR)
P leaf springs) 21 and 22 are formed by laminating 40% of fibers having a fiber direction of ± 0 degrees, 20% of fibers having a fiber direction of 0 degrees and 90 degrees, and 40% of fibers having a fiber direction of ± 45 degrees. It is configured.

The leaf spring made of CFRP thus configured is
50% fiber layer with 0 degree fiber direction, 4 fiber layers with ± 45 degree
It is equivalent to 10% of 90% fiber layers laminated at 0%.

[0015] Here, CFRP single material the angle of the carbon fiber to the tensile direction in the (unidirectional material) (fiber angle) with the direction of the longitudinal elastic modulus E ₁ and the direction of the longitudinal elastic modulus E ₂ relation orthogonal thereto FIG. 6 shows the ratio of the 45-degree fiber layer (horizontal axis) and the ratio of the 0-degree fiber layer (shown by curves at 10% intervals in the figure) in the laminated material obtained by laminating the single materials. FIG. 7 shows the relationship between the coefficients E1.

According to these figures, the longitudinal elastic coefficients E ₁ and E ₂ of the CFRP leaf spring having the above-mentioned structure are 805 and 805, respectively.
9.54 (kg / mm ² ), 4996.95 (kg / mm ² ) (E
₁ = 8059.54 (kg / mm ² ), E ₂ = 4996.9
5 (kg / mm ² )) and the transverse elastic modulus G
Is 2437.15 (kg / mm ² ) (G = 2437.15
(Kg / mm ² )).

As described above, the cross beams 22, 23 spanned between the side beams 21, 21 are set to be easily bent in the vertical direction and hard in the front-rear direction due to the cross-sectional shape and the anisotropy peculiar to the composite material. under constituted by the CFRP plate spring capable
By forming the frame 23, running track or strong shear deformation in the horizontal plane with respect to rail, moreover, as shown in FIG. 3, the vertical offset load P, the load P is created
The horizontal springs (leaf springs) 21 and 21 to be used are easily displaced δ in the vertical direction to flexibly cope with torsional deformation in the vertical direction, and the horizontal springs (leaf springs) exhibit strength against tensile and compressive forces acting in the horizontal direction. ) it is ensured by 21
Simplifies and reduces the weight of the bogie frame
be able to.

That is, in the conventional example shown in FIGS. 12 and 13, the torsion caused by the irregularity of the rails is absorbed by two operations (deformation) such as the bending of the shaft spring and the bogie frame itself. In the present embodiment, such torsion is absorbed only by deformation of the horizontal (leaf springs) 21 and 22.

The CFRP leaf spring is set to, for example, a thickness b = 13 mm and a width h = 400 mm, and is made of a spring steel plate having the same width and the same torsional rigidity. The buckling load when the side walls 21 and 22 are configured will be compared.

First, FIG. 8 shows the relationship between the plate thickness and the torsional rigidity when the plate thickness is changed at 400 mm in the CFRP leaf spring having the above configuration.
FIG. 9 shows the relationship between the plate thickness and the torsional rigidity when the plate thickness is changed in mm. From these figures, the plate thickness b 'of the spring steel plate at this time is 3.6 mm.

The Euler buckling load W when both ends are fixed
It is known that _cr can be expressed by W _cr = 4π ² EI / l ² where l is the length and I is the second moment of area, as shown in FIG.

[0022] Therefore, the second moment _{I CR} of the CFRP spring plate of the structure, since the ^{_{I CR = bh 3/12 =}} 400 × 13 3/12 = 7.323 × 10 4 (mm 4), Buckling load W when length 1 is 2460 mm
_{cr (CF)} is a ^{_{W cr (CF) = 4π 2}} × 8059.54 × 7.323 × 10 4/2460 2 = 3850 (Kg).

On the other hand, the second moment of area I _{SUP in} the case of the spring steel plate is I _SUP = bh ′ ³ /12=400×3.6 ³ /12=1.555×10 ³ (mm ⁴ ) , Buckling load W when length l is 2460 mm
_{cr (SUP)} becomes ^{_{W cr (SUP) = 4π 2}} × 21000 × 1.555 × 10 3/2460 2 = 213 (Kg).

Therefore, the ratio of the two is W _{cr (CF)} / W _{cr (SUP)} = 3850/213 = 18.1, which indicates that the buckling strength is about 18 times. At the four corners of the lower frame 23 configured as described above, that is, at both ends of the front and rear horizontal
A second spring 24 is disposed, and a vehicle body support frame 25 serving as a mounting space for the magnetic levitation device is mounted thereon and held thereon.

Further, pillow springs (secondary springs) 26 are attached to the four corners of the vehicle body support frame 25, and the vehicle body 27
It has been like holding.

The above embodiment shows an example in which the air springs 24 are mounted on the front and rear horizontal ribs 21 and 22 located on the lower side. As shown in FIG. A flange portion 25a is provided, and an air spring 24 is interposed between the flange 25a and the upper surface of the lower frame 23. Each of the side beams 20 is made of a steel plate, and the wheels are held by the steel side beams. By doing so, it can also be used as a bogie frame for a railway vehicle running on a rail.

[0027]

Since the present invention has the above configuration,
It has a flexible structure that can follow up and down deficiencies of the track and the rail, and it is possible to suppress movement in an unexpected direction only by the lateral spring (leaf spring). In addition, the force acting in the left-right direction can be canceled by the leaf spring, whereby the structure of the bogie frame itself can be simplified, and the weight can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing one embodiment of the present invention.

FIG. 2 is a vertical cross-sectional front view showing a state where the vehicle body is held.

FIG. 3 is a perspective view of a lower frame.

FIG. 4 is a plan view of a lower frame.

FIG. 5 is a front view of the lower frame.

FIG. 6 is a graph showing elastic properties of a CFRP veneer.

FIG. 7 is a graph showing elastic properties of a CFRP composite material.

FIG. 8 is a graph showing the relationship between torsional rigidity and plate thickness in the CFRP spring plate of the present embodiment.

FIG. 9 is a graph showing the relationship between the thickness of a spring steel plate and torsional rigidity.

FIG. 10 is a diagram for explaining the buckling load of the oiler.

FIG. 11 is a view corresponding to FIG. 2, showing another embodiment.

FIG. 12 is a plan view showing a conventional example.

FIG. 13 is a principle diagram for explaining displacement due to torsion.

FIG. 14 is a diagram corresponding to FIG. 2 showing another conventional example.

FIG. 15 is a view corresponding to FIG. 2 showing still another conventional example.

[Explanation of symbols]

 Reference Signs List 20 side beam 21, 22 side beam (CFRP spring plate) 23 lower frame 24 air spring (primary spring) 25 body support frame 26 pillow spring (secondary spring) 27 vehicle body

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B61F 3/00 B61B 13/08 B61F 5/52

Claims (2)

(57) [Claims] 1. A pair of left and right sides extending parallel to each other in the front-rear direction.
Side burrs and unidirectional fiber reinforced plastics with fibers oriented in one direction
The plates are laminated so that their fiber directions are different, and
And between the upper part at the front end of the side beam.
And between the lower part and the upper part at the rear end of the side beam.
Between the lower part and the lower part.
A leaf spring extending in the left-right direction so as to be in the direction, the pair of left and right side beams and the leaf spring.
And a body interposed between the pair of left and right side beams and the body support frame.
An air spring for suspending the vehicle body support frame. 2. Running on a track with electromagnets on both left and right sides
A bogie frame of a magnetic levitation vehicle that supports a vehicle body, and is composed of members having an electromagnet function, and is configured to alternate in a front-rear direction.
A pair of left and right side beams extending parallel to each other, and a fiber-reinforced plastic unit with fibers oriented in one direction.
The plates are laminated so that their fiber directions are different, and
And between the upper part at the front end of the side beam.
And between the lower part and the upper part at the rear end of the side beam.
Between the lower part and the lower part.
A leaf spring extending in the left-right direction so as to be in the right direction, and surrounded by the pair of left and right side burr and the four leaf springs
A body support frame whose lower part is accommodated in a space to be inserted, and a body interposed between the pair of left and right side beams and the body support frame.
And a pneumatic spring for suspending the vehicle body support frame.