JP6132714B2 - Tread surface friction control rail for inner track, tread surface friction control rail for outer track, and track - Google Patents

Description

  The present invention relates to a tread surface friction control rail for an inner track, a tread surface friction control rail for an outer track, and a track including these.

  When the railway vehicle travels on a curved section of the track, the wheel (inner ring) rolling on the inner rail and the wheel (outer ring) rolling on the outer rail are rotating at the same rotational speed, and The difference in the rotational radii between the inner and outer rails results in a difference in the peripheral speed between the inner ring and the outer ring. Due to the influence of the peripheral speed difference and the centrifugal force, a frictional force acts between the inner rail and the inner ring in a direction perpendicular to the track linearity. Further, if the outer ring slips between the outer rail and the outer ring, the outer ring rolls, and a frictional force acts between the outer rail and the outer ring in a direction along the alignment of the track.

  Therefore, smooth running in the curve section is hindered by the frictional force in the inner ring and outer ring, and there is a problem that a squeak noise is generated or a significant lateral pressure acts to wear the rails and wheels. is there. Specifically, as shown in FIG. 5, wavy wear 101 occurs on the upper surface of the inner rail 100 and a rolling noise is generated when the inner ring rolls. Further, the outer race flange 110 comes into contact with the side surface of the outer race rail 110 on the side of the inner race rail 100 to cause this side wear 111, and a contact noise is generated.

  In order to solve such a problem, a technique for reducing the frictional force between the wheel and the rail by performing watering, oiling, lubricant injection, etc. between the wheel and the rail has been conventionally known. Yes. Further, Patent Document 1 discloses a rail in which a groove is formed on the upper surface obliquely with respect to the traveling direction in order to reduce noise generated when the vehicle travels.

  By the way, in order to reduce the frictional force generated between the rail and the wheel described above, it can be achieved by reducing the area where the wheel and the rail are in contact with each other. In this respect, a groove is formed in the rail described in Patent Document 1, so that the contact area between the rail and the wheel can be reduced.

JP 2005-139605 A

  However, the invention of Patent Document 1 has a problem in that a groove is formed in a direction different from the direction of the frictional force generated between the wheel and the rail, and sufficient frictional force reduction cannot be achieved. Furthermore, there is a possibility that the vehicle travels in both directions of the rail extending direction. In the groove described in Patent Document 1, when the traveling direction of the vehicle is changed in this way, the groove formation pattern changes. It will be. Therefore, there is a possibility that the frictional force reduction effect varies depending on the difference in the traveling direction of the vehicle, and the frictional reduction effect cannot be obtained stably.

  The present invention has been made in consideration of such circumstances, and has a simple structure and can reduce the frictional force between the rail and the wheel. It aims to provide rails and tracks.

In order to solve the above problems, the present invention employs the following means.
That is, the tread surface friction control rail for the inner track according to the present invention is provided with an inner ring contact surface that is curved along the alignment of the track on which the vehicle travels and that the inner ring of the vehicle contacts and rolls. The inner ring contact surface is formed with a plurality of grooves extending in a direction orthogonal to the line at intervals in the direction along the line.

  According to such an inner track tread friction control rail (hereinafter simply referred to as an inner track rail), the vehicle travels in a section where the inner track rail is curved along the track alignment, that is, a curved section of the track. Then, the inner ring which is a wheel located inside the curve rolls on the inner ring contact surface. Here, since the groove is formed in the inner ring contact surface, the contact area between the inner ring contact surface and the inner ring can be reduced. In addition, since the groove is formed orthogonal to the track line, when the vehicle is traveling on a curved section, the frictional force generated in the direction orthogonal to the direction along the track line can be reduced. it can. Furthermore, by forming the groove so as to be orthogonal to the direction along the line, the groove formation pattern does not change even when the traveling direction of the vehicle is changed. For this reason, a frictional force reduction effect can be stably obtained regardless of the traveling direction of the vehicle.

  Furthermore, the groove may be formed only on the inner ring contact surface.

  When the vehicle travels in the curved section, the vehicle travels in a state where the inner ring is closer to the outer side in the rotational radius direction due to a difference in peripheral speed between the inner ring and the outer ring and centrifugal force. Therefore, the inner ring does not contact the entire upper surface of the inner rail, but contacts only the inner ring contact surface. Therefore, by forming the groove only on the inner ring contact surface, it is possible to efficiently reduce the frictional force between the inner ring and the inner ring contact surface.

  Further, a tread surface friction control rail for an outer track according to the present invention is provided by being curved along the alignment of a track on which the vehicle travels, and includes an outer ring contact surface on which the outer ring of the vehicle contacts and rolls. The outer ring contact surface is formed with a plurality of grooves extending in a direction along the alignment at intervals in a direction orthogonal to the alignment.

  When the vehicle runs on the track where the outer surface tread friction control rail is curved along the track alignment, that is, when the vehicle travels on the track curve section, the outer wheel, which is a wheel located outside the curve, rolls on the outer ring contact surface. . Here, since the groove is formed in the outer ring contact surface, the contact area between the outer ring contact surface and the outer ring can be reduced. Further, since the groove is formed along the alignment of the track, the frictional force generated in the direction along the alignment of the track can be reduced while the vehicle is traveling on the curved section. Furthermore, by forming the groove along such a line, the groove formation pattern does not change even when the traveling direction of the vehicle is changed. For this reason, the frictional force reduction effect can be stably obtained regardless of the direction of the vehicle.

  Furthermore, the track according to the present invention includes the above-described inner surface tread surface friction control rail and the outer surface tread surface friction control rail.

  According to such a track, the frictional force in the direction orthogonal to the track linearity can be reduced between the inner ring contact surface and the inner ring in the tread surface friction control rail for the inner track, and tread surface friction control for the outer track. A frictional force in a direction along the alignment of the track can be reduced between the outer ring contact surface and the outer ring in the rail. Therefore, the frictional force can be reduced more effectively.

  According to the tread surface friction control rail for the inner track, the tread surface friction control rail for the outer track, and the track according to the present invention, by forming the groove in a direction according to the alignment of the track, the wheel and the rail can be easily configured. The frictional force between them can be reduced.

It is a top view which shows the track | orbit which concerns on embodiment of this invention, and the wheel which rolls on a track | orbit. It is a perspective view which shows the track | orbit which concerns on embodiment of this invention. It is a front view which shows the track | orbit which concerns on embodiment of this invention, and the wheel which rolls on a track | orbit. It is a perspective view which shows the track | orbit concerning the modification of embodiment of this invention. It is a perspective view which shows the mode of abrasion of an inner track rail and an outer track rail when the groove | channel is not formed in the inner track rail and the outer track rail temporarily.

Hereinafter, the track 1 according to the embodiment of the present invention will be described.
As shown in FIG. 1, the track 1 enables the vehicle to travel by rolling wheels 20 in a carriage provided at a lower portion of a railway vehicle (hereinafter referred to as a vehicle).
The track 1 has a straight section 2 and a curved section 3. In the curved section 3, the track 1 includes a pair of rails 10, an inner track rail 11 (inner track tread friction control rail) positioned inside the curve and an outer track rail 15 (outer track) positioned outside the curve. The inner track rail 11 and the outer track rail 15 are provided to be curved along the alignment of the track 1.

  Although not shown, the inner rail rail 11 and the outer rail rail 15 are supported from below by ballasts, sleepers, and track slabs.

  As shown in FIG. 2, the inner rail 11 has an upper surface 12 with which a tread surface 21 a (see FIGS. 1 and 3) of an inner ring 21 that is a wheel 20 located inside the curve contacts. It is a steel member whose cross section perpendicular to the extending direction forms an I-shape. The upper surface 12 is formed flat so that the inner ring 21 can roll.

Here, as shown in FIG. 3, when the vehicle travels in the curved section 3, the inner ring 21 is rotated in the radial direction by the circumferential speed difference between the inner ring 21 and the outer ring 22 and the centrifugal force. The upper surface 12 of the inner rail 11 is rolled in a state of approaching the outside.
In this way, the portion of the upper surface 12 of the inner rail 11 that is in contact with the tread surface 21a of the inner ring 21 when the vehicle is traveling is referred to as an inner ring contact surface 13.

  As shown in FIG. 2, the inner ring contact surface 13 extends in parallel to each other in the width direction orthogonal to the linear direction with a space in the linear direction along the alignment of the track 1, which is the extending direction of the track 1. A plurality of grooves 14 are formed. In this embodiment, each groove 14 is formed not only on the inner ring contact surface 13 but also on the entire upper surface 12 of the inner rail 11, that is, over the entire region from one end side to the other end side in the orthogonal direction. The grooves 14 are regularly formed in the linear direction at equal intervals.

  The outer rail 15 has an upper surface 16 that is in contact with the wheel 20 located outside the curve, that is, the tread surface 22a of the outer ring 22, and, like the inner rail 11, has a cross section perpendicular to the extending direction of the outer rail 15. It is an I-shaped steel member. The upper surface 16 is formed flat so that the outer ring 22 can roll. Hereinafter, the upper surface 16 is referred to as an outer ring contact surface 17.

  A plurality of grooves 18 extending in parallel with each other in the direction along the line of the track 1 are formed on the outer ring contact surface 17 of the outer rail rail 15 at intervals in the width direction. The groove 18 is formed on the entire outer ring contact surface 17 which is the upper surface 16 of the outer rail 15. The grooves 18 are regularly provided at equal intervals in the width direction.

  According to such a track 1, when the vehicle travels on the curved section 3 of the track 1, the inner ring 21 rolls on the inner ring contact surface 13. Here, since the groove 14 is formed on the entire upper surface 12 of the inner rail 11, the contact area between the inner ring contact surface 13 and the inner ring 21 can be reduced.

Here, the wear amount of the inner ring contact surface 13 of the inner track rail 11 is R (mm), the specific wear amount is K (mm ³ / Nm), and the surface pressure acting on the inner ring contact surface 13 of the inner track rail 11 from the inner ring 21. Is P (MPa), the sliding speed, which is the relative speed between the inner ring 21 and the inner rail 11, is V (m / min), and the time that the inner ring 21 rolls on the inner rail 11 is T (min). . The wear amount of the inner rail 11 can be expressed by the following formula (1).

  R = K × P × V × T (1)

The specific wear amount K generally indicates a wear volume (mm ³ ) of a material when the material is worn by 1 (m) while a force of 1 (N) is applied to the material.

  Therefore, the specific wear amount K can be reduced by reducing the contact area between the inner ring contact surface 13 of the inner rail 11 and the inner ring 21, and as a result, the wear amount R of the inner rail 11 can be reduced. It becomes.

  Further, while the vehicle is traveling in the curved section 3, a frictional force is generated in the width direction between the inner rail 11 and the inner ring 21. And since the groove | channel 14 in the inner track rail 11 is formed in the width direction, the frictional force to this width direction can be reduced effectively.

  And since the groove | channel 18 is formed in the outer ring | wheel contact surface 17 of the outer rail rail 15, the contact area of the outer ring | wheel contact surface 17 and the outer ring | wheel 22 can be reduced. The specific wear amount K can be reduced, and as a result, the wear amount R of the outer rail rail 15 can be reduced by the above-described equation (1).

  Further, while the vehicle is traveling in the curved section 3, a frictional force is generated in the linear direction between the outer rail 15 and the outer ring 22. And since the groove | channel 18 in the outer rail rail 15 is formed in the linear direction, the frictional force to this linear direction can be reduced effectively.

  Further, the grooves 14 are formed in the width direction in the inner rail 11 and the grooves 18 are formed in the linear direction in the outer rail 15, so that even when the traveling direction of the vehicle is changed, the grooves 14, The formation pattern of 18 does not change. For this reason, a frictional force reduction effect can be stably obtained regardless of the traveling direction of the vehicle.

  According to the track 1 of this embodiment, the frictional force between the wheel 20 and the rail 10 can be reduced with a simple structure by forming the grooves 14 and 18 in the direction corresponding to the alignment of the track 1.

  Here, as shown in FIG. 4, the groove 14 of the inner rail 11 may be formed only on the inner ring contact surface 13 of the upper surface 12 of the inner rail 11. That is, the grooves 14 are formed in the orthogonal direction from the end on the outer rail rail 15 side, which is the outer side in the rotational radius direction, to the midway position of the upper surface 12 of the inner rail 11.

  As described above, when the vehicle travels in the curved section 3, the inner ring 21 rolls on the inner rail 11 while being close to the radially outer side of the rotation radius. For this reason, the tread surface 21 a of the inner ring 21 contacts only the inner ring contact surface 13.

  Therefore, by forming the groove 14 only on the inner ring contact surface 13, it is possible to efficiently reduce the frictional force between the inner ring 21 and the inner ring contact surface 13.

Although the embodiment of the present invention has been described in detail above, some design changes can be made without departing from the technical idea of the present invention.
For example, the groove 14 of the inner rail 11 and the groove 18 of the outer rail 15 do not necessarily have to be regularly formed at regular intervals. However, when the degree of irregularity of the interval between the grooves 14 and 18 increases, the generation of vibration when the wheel 20 rolls on the rail 10 is promoted, and the wear of the rail 10 and the wheel 20 may increase. . For this reason, it is preferable that the grooves 14 and 18 are regularly formed at equal intervals.

  Further, it is not always necessary to form the grooves 14 and 18 in both the inner rail rail 11 and the outer rail rail 15, and they may be formed in only one of them.

DESCRIPTION OF SYMBOLS 1 ... Track 2 ... Straight section 3 ... Curve section 10 ... Rail 11 ... Inner rail rail (tread surface friction control rail for inner track) 12 ... Upper surface 13 ... Inner ring contact surface 14 ... Groove 15 ... Outer rail rail (For outer track) Treading surface friction control rail) 16 ... Upper surface 17 ... Outer ring contact surface 18 ... Groove 20 ... Wheel 21 ... Inner ring 22 ... Outer ring 100 ... Inner rail rail 101 ... Outer rail rail 110 ... Wavy wear 111 ... Side wear

Claims (4)

An inner ring contact surface provided to be curved along the alignment of the track on which the vehicle travels and in which the inner ring of the vehicle contacts and rolls;
A tread surface friction control rail for an inner track, wherein a plurality of grooves extending in a direction orthogonal to the alignment are formed in the inner ring contact surface at intervals in a direction along the alignment.   The tread surface friction control rail for an inner track according to claim 1, wherein the groove is formed only on the inner ring contact surface. An outer ring contact surface that is curved along the alignment of the track on which the vehicle travels, and that the outer ring of the vehicle contacts and rolls;
A tread surface friction control rail for an outer track, wherein a plurality of grooves extending in a direction along the alignment are formed in the outer ring contact surface at intervals in a direction orthogonal to the alignment. A tread friction control rail for an inner track according to claim 1 or 2,
A tread friction control rail for an outer gauge according to claim 3,
Orbit characterized by comprising.

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