RU2609612C2 - Method of current maintenance of curved section of track in plan and track for its realization - Google Patents

Abstract

FIELD: transportation.

SUBSTANCE: method of current maintenance of a curved track section in plan includes sand filling onto an external rail length, at the same time sand filling is provided to the rail length of the track arranged with a shift in the areas of interaction of the wheel-rail system elements along rail rolling surface away from the center of the curve by means of change in external rail canting. To realize the method, a rail track is proposed, which comprises a curved section of the track in plan with sand filling to the external rail length, which is arranged with a shift in the areas of interaction of the wheel-rail system elements along rail rolling surface away from the center of the curve by means of change in external rail canting.

EFFECT: reduced wear of a track.

2 cl, 1 dwg

Description

The way the current content of the curved section of the track in the plan and the rail track for its implementation. The invention relates to railway transport, and in particular to the interaction of a railway wheel pair with a rail track, and can be used with the current content of the curved sections of the track in plan and in the construction and reconstruction of railways and the subway.

A known method of the current content of the curved section of the track in the plan (options), including adding sand to the outer rail thread as it wears (patent RU 2545153, B61C 15/10, B61K 3/00, publ. 03/27/2015, bull. No. 9) . Sand filling leads to the replacement of sliding friction on the outer rail yarn with rolling friction with reduced wear on the rail yarn and railway wheel. At the same time, the rolling friction on the inner rail is replaced by sliding friction. Alternating wear of the outer and inner rail threads extends the life and reduces the life cycle cost of the rail track and railway wheel. However, this method is not effective enough and is not applicable for curved sections of the path with a small radius.

The specified method is technically the closest to the proposed invention and adopted as a prototype.

The invention was tasked with increasing the efficiency of the method and extending it to curved sections of the track in plan with a smaller radius.

The technical result of the invention is to increase the efficiency of the method and extend it to curved sections of the track in a plan with a smaller radius, increase the resource and reduce the cost of the life cycle of the rail track and the railway wheel by reducing the intensity of wear of the rail gauge as a whole by uniform and alternating wear of the outer and inner rail threads.

The technical result is achieved due to the fact that in the method for the current maintenance of the curved section of the track in plan, including adding sand to the outer rail thread, sand is added to the rail thread of the rail track made with a shift of the places of interaction of the elements of the wheel-rail system along the surface of the rails in side from the center of the curve by changing the casing of the outer rail.

Thus, the proposed method consists in shifting in a curved section of the path of the rolling surfaces on the outer and inner rails away from the center of the curve by changing the casing of the outer rails. The rails are mounted asymmetrically. In this case, the gauge, defined as the distance between the inner faces of the rail heads, decreases slightly, and the surface area of the wheel in a circle of rolling, interacting with the rolling surface of the outer rail, increases.

We proceed from the following. The main interaction in the wheel - rail system occurs at the junction of the ridge - the side surface of the rail. The amount of friction when adding sand is directly proportional to the area of the contacting surfaces of the railway wheel in a circle of skating and rail on the surface of the skating. The larger the specified area, the greater the likelihood of a transition when sand is added by sliding friction on the outer rail thread to rolling friction with less wear on the contacting surfaces.

If acceleration is imposed on a pair of wheels at rest in a curved section of the track, then it will be set in motion along the guide rail threads. In this case, the wheel on the outer rail thread will experience rolling friction resistance with less wear, and the wheel on the inner rail thread will experience sliding friction resistance with great wear on the interacting surfaces of the wheel and rail.

However, if external acceleration is given to a trolley containing several wheelsets and located on a curved section of the track, the rolling friction resistance will be overcome by wheelsets wheels moving along the inner rail thread. Accordingly, wheelset wheels moving along the outer rail thread will overcome the sliding friction resistance. The aforementioned is associated with the shift of the center of gravity of the trolley towards the center of the curve and the redistribution of vertical loads from the side of the trolley to the rail threads towards the inner rail thread. The shift of the center of gravity towards the center of the curve on the curved section of the track will be most manifested in the case of a moving unit in the form of a carriage, the base of which (the distance between the centers of the car body supports on the undercarriage of the carriage) is several times larger than the base of the carriage. With a track gauge of 1,520 mm, a base of the car equal to 12,600 mm, and a radius of the curve of 1,000 m, the displacement of the longitudinal axis of the car toward the center of the curve will be 1.8 cm, and with a radius of the curve of 1,500 m - 1.2 cm.

GOST R 54747-2011 defines a cradle as the angle of inclination of the plane of the rail track to the longitudinal axis of the sleepers, measured in the vertical plane (not to be confused with the slope of the path from the horizon, creating an elevation of the outer rail to balance the centrifugal forces acting on the outer rail).

The product-leveling device eliminates the difference in the diameters of the surfaces of the wheels in the driving circle on one wheel pair, obtained during manufacture, and provides self-alignment of the wheel pair when moving in a straight section of the track and in a curve until the crest touches the side surface of the rail head.

The drawing shows the profile of the rail track made with the shift of the rolling surface on the outer rail to the side from the center of the curve.

The profile includes an outer rail 1 and an inner rail 2 with wheels 3 and 4 of a pair of wheels, respectively. The interaction of the wheel 3 on the wheel with the rail 1 occurs at point 5 with the contact spot 6, and the interaction of the wheel 4 on the wheel with the rail 2 - at point 7 with the contact spot 8.

Carry out the current content of the curved section of the track in the plan as follows.

If it is necessary to provide sand between the rail 1 and the rolling friction wheel 3, sand is added to the surface of the rail 1. Since the area of the spot 6 is located in the central part of the surface of the rail 1 head and is the largest, more sand gets on it and it is less carried away from the surface the air pressure during the movement of the mobile unit along the rail 1. The above leads to the achievement of a technical result, including by reducing the amount of sand needed for adding.

An example is the implementation of the method on a rail gauge profile intended for use on track sections in medium radius curves (for a gauge 1520 mm wide, the radius is from 1250 to 500 meters), which is performed with asymmetrically arranged rails. The inner rail is installed with a zero cushion (perpendicular), the outer one with a double cradle (with a 1/20 cuff, the size of the double cuff is 1/10) relative to the longitudinal axis of the sleepers. The transition from a straight section to a curved and vice versa is performed in the transition profile of the track with a smooth change in the casing of the outer rail.

To implement the proposed method, a rail track is used, the distinguishing feature of which is that it contains a curved section of the track in plan with sanding on the outer rail thread, which is made with a shift of the places of interaction of the elements of the wheel-rail system along the surface of the rails to the side from the center of the curve by changing the outer casing of the rail.

EFFECT: increasing efficiency, resource and reducing the life cycle cost of the rail track and railway wheel by reducing the intensity of wear of the rail track as a whole by uniform and alternating wear of the outer and inner rail threads. There is the possibility of using in the proposed rail track a curved section of the track in plan with a smaller radius.

The proposed technical solutions are new, are not explicit for a specialist, they are industrially applicable.

Claims (2)

1. The way the current content of the curved section of the track in the plan, including adding sand to the outer rail thread, characterized in that the sand is added to the rail thread of the rail track, made with the shift of the places of interaction of the elements of the wheel-rail system along the surface of the rails to the side from the center curve by changing the casing of the outer rail. 2. A rail track containing a curved section of the track in the plan with sanding on the outer rail, characterized in that the curved section of the track in plan is made with a shift of the places of interaction of the elements of the wheel-rail system along the surface of the rails to the side from the center of the curve by changing the armature outer rail.

Images