JP5045646B2 - Rail car axle box support device - Google Patents

Description

  The present invention relates to an axle box support device for a railcar bogie.

  2. Description of the Related Art Generally, an axle box support device for a railway vehicle bogie includes an axial spring made of a coil spring and an anti-vibration rubber between the axle box and the bogie frame. In particular, in recent passenger vehicle carts, a coil spring and an anti-vibration rubber are often installed in series, and therefore a shaft spring seat is provided to hold both properly.

  The shaft spring seat is required to have a sufficient strength because a large load for holding the vehicle body acts in the vertical direction. On the other hand, the shaft spring seat is required to have a small thickness and a compact size, particularly due to restrictions on the installation space in the vertical direction.

With regard to such a shaft spring seat, Patent Document 1 discloses a technique in which a liquid chamber formed in the shaft spring seat and the vibration-proof rubber is communicated with a passage having an orifice. In the case of this technique, when the vibration isolating rubber is deformed, the liquid in the liquid chamber moves through the orifice to the liquid chamber of the shaft spring seat, thereby damping the vibration and improving the vibration damping property.
JP 2004-1614 A

  However, since the technique disclosed in Patent Document 1 fills the liquid by forming a liquid chamber in the anti-vibration rubber, the thickness of the anti-vibration rubber is increased, and the vertical direction of the axle box support device is made thin and compact. It is not possible. Moreover, there is no description or suggestion about the thinning of the shaft spring seat.

Further, in Patent Document 2, in a shaft beam type shaft box support device, a spacer is provided between the shaft spring and the shaft box so as to be separated in the front-rear direction, and a vertical load acting from the shaft spring is applied to the front and rear of the shaft box. Thus, a technique is disclosed in which the vertical load is uniformly applied to the bearing held by the axle box.
JP 2007-261292 A

  However, since the technique disclosed in Patent Document 2 interposes a spacer between the shaft spring and the shaft box, the vertical direction of the shaft box support device cannot be made thin and compact. Moreover, there is no description or suggestion about the thinning of the shaft spring seat.

Further, in Patent Document 3, in order to save space in the wing-type axle box support device, a recess is formed in the bogie frame above the coil spring, and a part of the coil spring is accommodated inside the bogie frame. Technology is disclosed.
JP 2002-212394 A

  Although the technology disclosed in Patent Document 3 can save space in the vertical direction of the axle box support device, a recess for accommodating a part of the coil spring is formed inside the bogie frame, so that the structure of the bogie frame is It becomes complicated and the production man-hour increases. Moreover, there is no description or suggestion about the thinning of the shaft spring seat.

  The problem to be solved by the present invention is that there is no shaft box support device having a compact shaft spring seat having both strength and thinness in the conventional shaft box support device.

The rail car axle box support device of the present invention is
In order to obtain an axle box support device with a compact axle spring seat that combines strength and thinness,
An axle box that rotatably supports the wheel shaft via a bearing;
A support portion for supporting the axle box and the carriage frame so that relative displacement is possible;
Between the axle box and the bogie frame, a coil spring and an anti-vibration rubber, and an axle box support device for a railway vehicle provided with an axle spring seat interposed between the two,
The shaft spring seat is formed by projecting a cylindrical portion to be inserted into the inner surface of the coil spring on one surface of the plate-like portion, and providing a notch in a part of the cylindrical portion. Main features.

  The axle box support device for a railway vehicle according to the present invention cuts out a part of the cylindrical portion that supports the coil spring in which local high stress is generated by the load acting from the coil spring, so that stress concentration can be reduced. it can. Therefore, a thin and compact shaft spring seat can be obtained while maintaining the overall function.

  The notch provided in a part of the cylindrical portion is effective and more preferably provided in the vicinity including the rising portion of the coil spring.

  In the rail car axle box support device of the present invention, when an annular portion for supporting the vibration isolating rubber is formed on the surface of the plate-like portion opposite to the surface on which the cylindrical portion is formed, It is desirable because vibration rubber can be fixed easily.

  According to the present invention, since the stress at the position where the local high load acts on the shaft spring seat can be reduced, it is possible to provide a shaft box support device having a thinner and more compact shaft spring seat. .

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the best mode for carrying out the present invention will be described with reference to the accompanying drawings along with the new idea of the present invention and the progress from the new idea to the solution of the problem.

  In the axle box support device, for example, as shown in FIG. 5, the axle box 3 that rotatably supports the wheel shaft 2 via the bearing 1 is supported via the buffer rubber 8 so as to be relatively displaceable on the carriage frame 4. Has been. A coil spring 5 and an anti-vibration rubber 6 are provided between the axle box 3 and the carriage frame 4, and an axle spring seat 7 is interposed between the two to properly hold the both 5 and 6. .

  At present, as shown in FIG. 6, the shaft spring seat 7 has a shape in which cylindrical portions 7b and 7c are projected on both surfaces of a disc portion 7a. And one cylindrical part 7b of the said cylindrical parts 7b and 7c guides the inner surface 5a of the coil spring 5, and the other cylindrical part 7c guides the inner surface 6a of the vibration isolating rubber 6, Anti-vibration rubber 6 is held.

  In order to hold the coil spring 5 and the vibration isolating rubber 6 appropriately by the cylindrical portions 7b and 7c, the inner surface 5a of the coil spring 5 and the outer surface 7ba of the cylindrical portion 7b, and the inner surface 6a of the vibration isolating rubber 6 It is necessary to reduce the gap between the outer surfaces 7ca of the cylindrical portion 7c.

  In this case, since the anti-vibration rubber 6 made of rubber can be easily formed into an arbitrary shape, even if the gap between the inner surface 6a of the anti-vibration rubber 6 and the outer surface 7ca of the cylindrical portion 7c is reduced, The curvature of the part which joins the said disk part 7a and the cylindrical part 7c can be enlarged.

  However, since the coil spring 5 is formed by winding a rod-shaped material into a coil shape and processing both ends thereof flatly, the curvature of the flat portion 5b and the inner surface 5a at both ends becomes small at the end of the spring, and at right angles. The situation is close (see FIG. 6B).

  In this case, if the gap between the inner surface 5a of the coil spring 5 and the outer surface 7ba of the cylindrical portion 7b is reduced, the curvature of the joint portion between the disk portion 7a and the cylindrical portion 7b is coiled to avoid interference with the coil spring 5. It is necessary to make it smaller than the curvature of the end of the spring 5. Therefore, the disk part 7a and the cylindrical part 7b cannot be joined smoothly.

  In such a shaft box support device, when a vertical load is applied to the shaft spring seat 7 via the coil spring 5, the end of the coil spring 5 of the cylindrical portion 7 b positioned in series with the anti-vibration rubber 6, In particular, a high load acts locally in the vicinity of rising from the disk portion 7a.

  This is because, when the disc portion 7a is thin, if the anti-vibration rubber 6 is present, the vicinity of the rising portion of the coil spring to which a large up-and-down load is applied partially sinks and a bending strain is generated. This is because high stress is generated at the joint portion having a small curvature between the portions 7b. The anti-vibration rubber 6 is disposed on either the upper part or the lower part of the coil spring 4, but the same phenomenon as described above occurs in any case.

  On the other hand, since the disc portion 7a and the cylindrical portion 7b of the shaft spring seat 7 are made of the same material and have the same strength, a high stress is generated at a site where the local high load acts. Therefore, in the past, the entire thickness of the shaft spring seat 7 has been greatly increased to withstand high local stresses, and the strength has been improved. Therefore, the thickness of the shaft spring seat 7 must be increased. It was.

  Therefore, in the present invention, for example, as shown in FIG. 1, a coil is formed on a part of a cylindrical portion 7 b that is inserted into the inner surface 5 a of the coil spring 5 that protrudes from one surface of the disk portion 7 a that forms the shaft spring seat 7. A notch 7bb is provided so as not to impair the installation function of the spring 5.

  More specifically, a notch 7bb is provided over the entire length of the cylindrical portion 7b in the vicinity of the cylindrical portion 7b including the rising portion 5c of the coil spring 5, and the stress concentration between the disk portion 7a and the cylindrical portion 7b is provided. The cylinder itself, which is the cause of this, is eliminated locally.

  In FIG. 1, a cylindrical portion 7c is projected also on the other surface of the disk portion 7a, and the anti-vibration rubber 6 is supported by the cylindrical portion 7c.

  When the shaft spring seat 7 shown in FIG. 1 is adopted, even if a local high load acts near the rising portion 5c of the coil spring 5 in the cylindrical portion 7b due to the load acting from the coil spring 5, It can suppress that local stress concentration arises in the part concerned.

  Accordingly, the stress acting on the shaft spring seat 7 can be equalized while maintaining the function of the shaft spring seat 7, and the thickness of the disk portion 7 a can be reduced and the size can be reduced.

  Incidentally, in order to confirm the effect of the present invention, the load acting on the vicinity including the rising portion 5c of the coil spring 5 where the occurrence of stress concentration is expected is measured by the method shown in FIG. 2 (see FIG. 3). . The load was measured by measuring the result when a static load of 20 kN was applied from the coil spring 5 to the shaft spring seat 7 by the hydraulic jack 11 with a strain gauge.

  In FIG. 2, 12 is a jig corresponding to a carriage frame, 13 is a surface plate, and 14 is a load cell interposed between the jig 12 and a cylinder 15 attached to the tip of the hydraulic jack 11.

  Table 1 below shows the maximum stress at each measurement point. When the shaft spring seat of the present invention is used, the maximum stress is reduced by about 40% from 307 MPa to 176 MPa compared with the case of using the conventional shaft spring seat. did. Due to this stress reduction effect, the thickness of the disk portion 7a of the shaft spring seat 7 can be reduced, and the shaft spring seat 7 can be made compact.

  Needless to say, the present invention is not limited to the above-described examples, and the embodiments may be appropriately changed within the scope of the technical idea described in the claims.

  For example, in the case of the example of FIG. 1, the notch 7bb of the cylindrical portion 7b is provided in the vicinity of the coil spring 5 including the rising portion 5c over the entire longitudinal direction, so that the cylindrical portion of the coil spring 5 and the shaft spring seat 7 is provided. There is a concern that the play with 7b increases and the guide function of the coil spring 5 decreases.

  Therefore, as shown in FIG. 4, the notch 7bb is provided only on the disk portion 7a side of the cylindrical portion 7b, and the opposite side in the longitudinal direction is left, so that stress concentration is maintained while maintaining the guide function of the coil spring 5. It may be prevented.

  Further, in the example of FIGS. 1 and 4, the shaft spring seat 7 is described as having a shape in which the cylindrical portions 7b and 7c are protruded on both surfaces of the disk portion 7a, but the cylindrical portions 7b and 7c are protruded. The disk part 7a may be a plate-like part. Even if it is not necessarily a disc shape, the shape is not limited as long as it is a plate shape.

  Furthermore, the cylindrical portion 7b that supports the coil spring 5 may also have a shape in which a taper is partially formed, for example, near the tip, or a shape in which two cylinders are stacked and the tip side diameter is reduced. That is, what is necessary is just to be able to form a cylindrical part having an appropriate diameter on the above-mentioned plate-like part (disk part 7a) side. The cylindrical portion 7c that supports the anti-vibration rubber 6 may also have any shape as long as it has an annular shape that can support the anti-vibration rubber 6.

  Furthermore, the cylindrical portion 7c for supporting the vibration isolating rubber 6 is not an essential component, and the vibration isolating rubber 6 may be fixed by being sandwiched by another plate member or the like. Further, a part of the shaft spring seat 7 may be provided with a protrusion and supported.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the 1st example of the axial spring seat which is a component of the axle box support apparatus for rail vehicles of this invention, (a) is the figure seen from the front, (b) is A- of (a) figure. A sectional view, (c) is a view from the bottom. It is a figure explaining a static load test. It is the figure which showed the measuring point in a static load test, (a) is the 1st example of the axial spring seat of this invention, (b) is the figure which showed the example of the conventional axial spring seat. It is a figure explaining the 2nd example of the axis | shaft spring seat which is a component of the axle box support apparatus for rail vehicles of this invention, (a) is the figure seen from the front, (b) is the figure seen from the side, c) is a view from the bottom. It is a figure explaining the axle box support apparatus for rail vehicles, (a) is the figure seen from the side surface of a vehicle, (b) is an enlarged view of an axle box part. It is a figure explaining the axial spring seat which is a component of the conventional axle box support apparatus for rail vehicles, (a) is the figure seen from the front, (b) is the figure seen from the side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bearing 2 Wheel shaft 3 Shaft box 4 Bogie frame 5 Coil spring 5a Inner surface 5c Rising part 6 Anti-vibration rubber 7 Shaft spring seat 7a Disk part 7b Cylindrical part 7bb Notch 7c Cylindrical part 8 Buffer rubber

Claims (4)

An axle box that rotatably supports the wheel shaft via a bearing;
A support portion for supporting the axle box and the carriage frame so that relative displacement is possible;
Between the axle box and the bogie frame, a coil spring and an anti-vibration rubber, and an axle box support device for a railway vehicle provided with an axle spring seat interposed between the two,
The shaft spring seat is formed by projecting a cylindrical portion to be inserted into the inner surface of the coil spring on one surface of the plate-like portion, and a notch is provided in a part of the cylindrical portion. An axle box support device for railway vehicles.   The axle box support device for a railway vehicle according to claim 1, wherein a notch provided in a part of the cylindrical portion is provided in a vicinity including a rising portion of the coil spring.   The axle box supporting device for a railway vehicle according to claim 1 or 2, wherein the notch provided in a part of the cylindrical portion is provided only on the plate-like portion side.   The annular part for supporting the said vibration-proof rubber is formed in the surface on the opposite side to the surface in which the said cylindrical part was formed of the said plate-shaped part, The any one of Claims 1-3 characterized by the above-mentioned. A rail car axle box support device according to claim 1.

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