JP4925699B2 - Shaft box support device - Google Patents

Description

  The present invention relates to an axle box support device for a railway vehicle or the like.

  An axle box support device such as a railway vehicle holds an axle at an appropriate position with respect to a carriage frame and further supports a load in the vertical direction. Also, in order to keep the front and rear axles parallel and to satisfy the contradictory performance of the straight axle stability and curve turning, the axles must be elastically supported with appropriate rigidity in the front and rear and left and right directions with respect to the carriage frame. I must. Furthermore, it is required that maintenance is not required with minimal deterioration over time.

FIG. 9 is a schematic side view showing an example of a conventional axle box support device. Here, the axle box support device 1 includes an axle box 4 that rotatably supports the wheel shaft 2 via a bearing 3, an axle spring 5 disposed immediately above the axle box 4, an axle spring 5, and the axle box 4. A disk-shaped vibration isolator 7 arranged between the two and supporting the shaft box 4 projecting toward the center of the carriage in the traveling direction of the carriage, or integrally formed with the axle box 4 or by a fastening member By supporting the countershaft box side of the arm 6 and the carriage frame 14 so as to be able to rotate (or swing), the weight of the vehicle body is borne and the space between the axle box and the carriage frame is buffered. The bearing 3 includes an inner ring 3a, a rolling element 3b, a cage 3c, and an outer ring 3d. The axle 2 is press-fitted into the inner ring, and the outer ring 3d is housed in the axle box 4. In such a shaft beam type axle box support device, a load R acts on the bearing 3 via the axle spring 5 and the axle box body on the axle box 4. Inside the bearing, the load is transmitted to the outer ring 3d, the rolling element 3b, and the inner ring 3a, and is transmitted to the axle 2 press-fitted into the inner ring 3a. Since the outer ring 3d is in contact with the axle box and does not rotate, the load receiving portion (load zone) is fixed. However, since the rolling element 3b and the inner ring 3a rotate together with the axle 2, the rolling surface of the rolling element 3b. The load is applied to the entire inner ring raceway surface. Here, the rolling surface means the surface on which the rolling elements 3b roll, the outer ring raceway surface being the inner surface, and the inner ring raceway surface being the outer surface. As a technique for measuring the load in such a type of bearing, there is one described in Patent Document 1 below.
JP 2004-219161 A

However, the following problems remain in the conventional axle box support device. That is, in the conventional axle box support device, a load is applied to the bearing through the disc-shaped vibration isolator 7. For this reason, there is a possibility that the outer ring, the inner ring, and the rolling element may be separated or worn.
When peeling or wear occurs, metal powder is mixed with the grease of the bearing, and wear progresses further when grease mixed with metal powder circulates. The progress of wear causes abnormal heat generation and rotation failure, and there is a problem of shortening the life of the bearing. Further, in order to prevent the occurrence of these problems and ensure safety, it is necessary to frequently replace grease or to frequently replace bearings.
Therefore, as a result of examining the load distribution in the bearing 3, it was found that it is as shown in FIG. Now, paying attention to one rolling element, the rolling element is loaded only when the axle rotates and the rolling element passes through the load zone. In the case of this example, when the rolling element is in the position immediately above, the outer ring, the inner ring, and the rolling element are subjected to the maximum load. This maximum value is called the maximum rolling element load, and it has become clear as a new issue to reduce the maximum value.

  The present invention has been made in view of the above-mentioned problems. By widening the load area of the bearing, the service life is extended by distributing the load and reducing the maximum rolling element load, thereby ensuring safety. Another object of the present invention is to provide an axle box support device that does not require maintenance and inspection.

The present invention employs the following configuration in order to solve the above problems. That is, the axle box support device of the present invention includes an axle box that rotatably supports the wheel shaft via a bearing, an axle spring disposed between the axle box and the carriage frame, and the axle spring and the axle. An anti-shaft of a support arm formed integrally with the axle box or integrally formed by a fastening part, wherein the axle box protrudes toward the center of the carriage in the traveling direction of the carriage. By supporting the box side and the carriage frame so as to be rotatable, the axle box supporting device that bears the mass of the vehicle body and cushions between the axle box and the carriage frame, the vibration isolator and the axle box A spacer is disposed between the spacers , and the spacer is formed integrally with the axle box.

Moreover, the axle box support device according to the present invention is characterized in that the spacer is arranged in two parts separated immediately in the front-rear direction immediately above the axle box.

  Moreover, the axle box support apparatus concerning this invention WHEREIN: It is preferable that the said spacer is a linear block divided into 2 before and behind the advancing direction of a vehicle. Further, the central portion may be made thinner than the block, or the central portion may be made thinner by stacking plates on the front and rear blocks.

  The spacer may be formed integrally with the vibration isolator. Further, the spacer may be formed integrally with the axle box, and the central part may be made thinner than the plate material, or the central part may be made thin by stacking plates on the front and rear portions.

  According to the axle box supporting device of the present invention, the axle box that rotatably supports the wheel shaft via the bearing, the shaft spring disposed between the axle box and the carriage frame directly above the axle box, and the carriage frame are rotated. A support arm that is movably supported to support the axle box from the side, and a vibration isolator disposed between the axle spring and the axle box, and a spacer is disposed between the vibration isolator and the axle box. Since the load area is widened, the maximum rolling element load can be reduced. Therefore, the service life of the bearing can be extended to ensure safety, and the number of maintenance inspections can be reduced.

Hereinafter, a first embodiment of an axle box support device according to the present invention will be described with reference to FIGS. 1 to 4.
The axle beam type axle box support device 10 according to the present embodiment is disposed between an axle box 13 that rotatably supports the wheel shaft 11 via a bearing 12 and a carriage frame 14 directly above the axle box 13. A shaft spring 15, and a vibration isolator 17 disposed between the shaft spring 15 and the shaft box 13, and the shaft box 13 protrudes toward the center of the carriage frame 14 in the traveling direction of the carriage frame 14. It arrange | positions so that the countershaft box side of the support arm 16 and the trolley | bogie frame 14 which are integrally formed with the axle box 13 or integrally by fastening parts may be supported so that rotation (or rocking | fluctuation) is possible.
The vibration isolator 17 in this embodiment is a donut-shaped disk made of rubber bonded to a steel plate and has a thickness of about 20 mm.

  The spacer 18 in this embodiment is divided into two parts before and after the traveling direction of the vehicle. The shape of the spacer 18 is a linear block.

  According to the axle box support device 10 of the present embodiment configured as described above, when a load R is applied to the axle spring 15 as shown in FIG. , Transmitted to the axle box 13. For this reason, the distribution of the rolling element load of the bearing is as shown in FIG. 4, and the load zone extends in the circumferential direction, and the maximum rolling element load can be reduced. Therefore, peeling and wear of the outer ring, inner ring, and rolling element can be suppressed, and the life of the bearing can be extended. For this reason, the replacement frequency of the bearing can be remarkably reduced, and the number of maintenance inspections can be reduced.

5 and 6 show a second embodiment of the present invention.
This embodiment is an example of a structure in which a vibration isolator and a spacer are integrally formed. The vibration isolator 17 ′ is composed of a steel plate 17′a and a rubber 17′b, and has a structure in which a portion of the rubber 17′b that contacts the axle box is separated before and after the vehicle traveling direction.
In this case, as shown in FIG. 6, it is preferable to provide the steel plate 17′a with a structure that prevents deformation of the rubber.

FIG. 7 shows a third embodiment of the present invention.
This embodiment is an example of a structure in which the axle box 13 'is formed integrally with the spacer. Block-shaped projections corresponding to spacers are installed on the upper surface of the axle box so as to be separated from each other in the vehicle traveling direction.

In addition, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
The target bearings are deep groove ball bearings, cylindrical roller bearings, tapered roller bearings, and the like. The target axle box is a type of axle box in which a load acts from directly above the bearing, including a shaft beam type axle box.

It is a schematic block diagram which shows 1st Embodiment of the axle box support apparatus concerning this invention. It is a schematic side view which shows a coaxial box support apparatus. It is a schematic plan view which shows a coaxial box support apparatus. It is explanatory drawing which shows the rolling element load distribution of the bearing in a coaxial box support apparatus. It is a schematic side view which shows 2nd Embodiment of the axle box support apparatus concerning this invention. It is a schematic side view of the vibration isolator. It is a schematic side view which shows 3rd Embodiment of the axle box support apparatus concerning this invention. It is explanatory drawing which shows the rolling element load distribution of a bearing. It is a schematic side view which shows an example of the conventional axle box support apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Shaft box support apparatus 11 Wheel shaft 12 Bearing 13 Shaft box 14 Bogie frame 15 Shaft spring 16 Support arm 17 17 'Vibration isolator 18 Spacer

Claims (4)

An axle box support device for a railway vehicle cart, an axle box that rotatably supports a wheel shaft via a bearing,
A shaft spring arranged between the bogie frame and the shaft box;
A vibration isolator disposed between the shaft spring and the shaft box,
Projecting the axle box toward the center of the carriage in the traveling direction of the carriage, the opposite side of the support arm formed integrally with the axle box, or integrally formed by fastening parts, and the carriage frame are rotatably supported. In the axle box support device that bears the mass of the vehicle body and cushions between the axle box and the carriage frame,
A spacer is disposed between the vibration isolator and the axle box,
The axle box support device, wherein the spacer is formed integrally with the axle box. The axle box support device according to claim 1, wherein the spacer is divided into two parts in front of and behind the traveling direction of the vehicle. Each of the two divided spacers supports the vibration isolator, each of which is in the form of a single plate, the central part of one side is configured as a concave surface, the surface in contact with the axle box is a concave surface, and the vehicle traveling direction of the axle box The axle box support device according to claim 2, wherein a concave surface is arranged in the center. The axle box support device according to claim 3, wherein the spacer is formed integrally with the vibration isolator.

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