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Title:
RAIL HEAD LUBRICATION BOREHOLE AND METHOD FOR SUPPLYING OF LUBRICANT TO RAIL HEAD
Document Type and Number:
WIPO Patent Application WO/2018/021978
Kind Code:
A1
Abstract:
Rail head lubrication borehole and method for supplying of lubricant to rail head solves technical problem of lubricating of rails through a borehole, wherein said borehole runs through said rail head and starts on essentially upper surface of rail head regardless whether this surface forms part of top of rail head or side of rail head and ends below rail head next to rail web in such a way that said borehole does not intersect with vertical line of said rail or imaginary line of edge of rail web zone, said zone extending along rail web and through said rail head thus providing for unimpeded load bearing ability of rail web and rail head above said rail web. In such a way there is sufficient room for traversing of rail lifting mechanism on essentially underside of rail head.

Inventors:
PAVČNIK, Bojan (Šmarška17, 3320 Velenje, SI)
Application Number:
SI2017/000018
Publication Date:
February 01, 2018
Filing Date:
July 19, 2017
Export Citation:
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Assignee:
PAVČNIK, Bojan (Šmarška17, 3320 Velenje, SI)
International Classes:
B61K3/00
Attorney, Agent or Firm:
MARN, Jure (Ljubljanska ulica 9, 2000 Maribor, SI)
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Claims:
PATENT CLAIMS

1. Method for supplying of lubricant to rail head (1) characterized in that it comprises the following steps:

drilling of a borehole through rail head (1) in such a way that said borehole (2) does not intersect with rail web (7) zone, said zone comprising edge of said zone of rail web (7), said zone extending along said rail web (7) through said rail head

(i);

inserting of lubricant supply line (4) in such a way that outer wall of said lubricant supply line (4) forms loose fit with said borehole (2);

fixing of said lubricant supply line (4) within said borehole (2).

2. Method according to Claim 1, wherein said fixing of said lubricant supply line (4) within said borehole (2) comprises the following steps:

- insertion of head of a sleeve (3) at the first end of said sleeve (3), said first end preferably narrowed, into said lubricant supply line (4), wherein said lubricant supply line (4) is already inside said borehole (2);

- pushing of said sleeve (3) into said lubricant supply line (4) in such a way that a tight fit is formed between outer wall of said lubricant supply line (4) and inner wall of said borehole (2), and further in such a way that the second end of said sleeve (3) being distal from said first end of said sleeve (3) is under a surface of said rail head (1) so a wheel of a rolling stock (5) does not come into contact with said sleeve (3).

3. Method according to Claim 1, wherein said fixing of said lubricant supply line (4) within said borehole (2) comprises the following steps:

- insertion of a sleeve (3) into said lubricant supply line (4) wherein said lubricant supply line (4) is not yet inside said borehole (2);

- pushing of said lubricant supply line (4) comprising said sleeve (3) into said borehole (2) in such a way that tight fit between outer wall of said lubricant supply line (4) and internal wall of said borehole (2) is formed, in such a way that the second end of said sleeve (3) being distal from said first end of said sleeve (3) is under a surface of said rail head (1) so a wheel of a rolling stock (5) does not come into contact with said sleeve (3).

4. Method according to any of previous claims, further comprising step of lubricating with said lubricant, preferably composite heavy fluid compound (CHFC) wherein said lubricant is supplied through lubricant supply line (4) and through said sleeve (3) onto surface of rail head (1).

5. Rail head lubrication borehole, characterized in that it comprises borehole (2), extending essentially in straight line between upper surface of rail head (1) and lower surface of said rail head (1) in such a way that said borehole (2) ends at rail web (7) in such a way that it does not intersect of rail web (7) zone, said rail web (7) zone comprising edge of said rail web (7) zone, said zone extending along said rail web (7) through rail head (1).

6. Rail head lubrication borehole according to claim 5 further comprising lubricant supply line (4) which forms a tight fit (2) by means of a sleeve (3), said sleeve (3) pushed inside said lubricant supply line (4) in such a way that head of said sleeve (3) at the first end of said sleeve (3), said first end of said sleeve (3) preferably narrowed, is inserted into lubricant supply line (4), wherein the second end of said sleeve (3) being distal to said first end of said sleeve (3) is below surface of said rail head (1) in such a way that wheel of a rolling stock (5) is not in contact with said sleeve (3).

7. Rail head lubrication borehole according to claim 5 or claim 6 wherein distal end of said sleeve (3) comprises opening having round form or in form of a slit.

Description:
Rail head lubrication borehole and method for supplying of lubricant to rail head DESCRIPTION Presentation of problem

In process of transport on rails there is increased friction between wheel flange and rail in curves. This increased friction causes screeching and increased wear both rails and wheels, as well as corrugation of rails. The biggest problems occur in curves where relative slip between rail and wheel is observed, resulting in intensive wear of both as well as screeching. Due to synchronized movement of rail vehicles in direction essentially perpendicular to rails (left-right) and due to slip of wheels in curves there is accelerated corrugation of rails resulting in often grinding of the rail heads. Essence of solution to technical problem is therefore to find such method of lubrication that corrugation and wear of metal parts are reduced and enabling obstacle free passage of vehicles for regulation of rail as well as use of environmentally friendly means, control of exit quantities independent of outside temperature and reduction of us of lubricating means.

State of the art

To reduce wear grease nipples are usually used, said grease nipples using graphite grease, having properties highly dependent on temperature, and further, lubrication systems with bores intersecting at an angle are used.

US421647 presents method for reduction of corrugation of rails and reduction of friction between wheel and rail using lubrication means on said rails wherein said lubrication means is applied to said rail through a bore.

US 1883148 shows supply of lubrication means on internal angle of rail head through throughway 5 which extends through said head and connects to the tube. In addition wear reduction device is shown in EP 1747134. In particular, said device comprising greaser housing, attachment spring for attachment of said greaser housing to the rail, tubes for supply of grease to or through the rail, capturing receptacle for capturing of excess lubricant on the rail, special embodiment of borehole for supply of lubricant and positioning of sensor inside the rail head. For supply of lubricant onto the lubricating surface there is a borehole made through the rail in such a way that its axis in cross section does not lay parallel to symmetry axis of said rail or parallel to web of the rail but forms an angle relative to symmetry axis of a rail. According to this invention the lubricant is applied onto said rail through the borehole forming acute angle relative to symmetry axis of said rail in cross section into arbitrarily formed groove in rail head. Borehole which is so formed does not follow through rail web but is inside the rail head forming acute angle relative to symmetry axis in cross section of the rail. This borehole does not impose onto rail web line, however, it consists of two non parallel intersecting bores (it is drilled from two sides). On the lower side of rail head the bore features larger diameter so tube can be attached into said rail. The attachment element below rail head (next to rail web) are relatively large and take too much space so they must be disassembled and removed during passage of rail lifting mechanism during machine alignment and regulation of rails. As said borehole is only 4 mm in diameter in state of the art there is a problem of how to attach said supply tube into said rail in order to assure sealing, mechanical stability due to high return pressures during passage of railway cars wheels while not substantially reducing diameter of flow channel as this would increase resistance of the material at the exit, and result in high load of pumping elements (pumps). This is of particular importance in applying correct does of heavy fluid CHFC materials with high content of solid particles as it is undesirable to substantially reduce said bore due to increased resistance during material distribution as this causes failure of dosing device. Increased resistance at the exit causes separation of fluids from solid particles, to be followed by clogging of exit openings with materials, to be followed by damage to the tubes and pumping device. It is for this reason that appropriate solution for attachment must be found, said solution resistant to relatively high loads and pressures and not significantly reducing of internal diameter of tube for material distribution. Description of new invention

The subject of this invention is rail head lubrication borehole and method for supplying of lubricant to rail head and solves above referenced problem in such a way that the problems caused by embodiment of patent EP 1747134 are avoided.

For purposes of this application, lubricant stands for any lubrication means used for lubricating, preferably rail, preferably reducing friction, however also means for increasing friction as situation may require from time to time.

The main difference between this solution and one proposed in EP 1747134 is in that the borehole according to this invention is made of a single part and is axis of said borehole essentially straight and not broken. Said borehole runs through said rail head and starts on essentially upper surface of rail head regardless whether this surface forms part of top of rail head or side of rail head and ends below rail head next to rail web in such a way that said borehole does not intersect with vertical line of said rail or imaginary line of edge of rail web zone, said zone extending along rail web and through said rail head thus providing for unimpeded load bearing ability of rail web and rail head above said rail web. In such a way there is sufficient room for traversing of rail lifting mechanism on essentially underside of rail head.

The lubricant supply itself is carried out by introducing a lubricant supply line into the borehole, said lubricant supply line being essentially loose with respect to the borehole. The lubricant supply line is then tightened into the borehole by inserting a sleeve which, by penetrating the lubricant supply line, extends the lubricant supply line so that it tightly rests on the inner surface of the borehole. The sleeve is pushed sufficiently deeply to prevent contact with the wheels of the rolling stock.

In such a way, it is achieved that due to the pressure of the wheels or because of the vibrations said lubricant supply line does not escape from the borehole, and at the same time a sufficient tightness is achieved so that the lubricant does not penetrate along the outer wall of the lubricant supply line toward the lower part of the rail head. Said sleeve itself is formed in such a way on the part where said lubrication means exit from said sleeve toward surface of said rail head that it conforms to needs of a dosing point or point, at which lubrication occurs. The form of exit part is preferably round, or in form of a slit.

Below the essence of the invention is further explained with help of the figures, said figures forming part of this patent application, and present:

Figure 1 presents rail (8) on which wheel of rolling stock may roll (5), showing rail head (1), borehole (2), room for traversing of rail lifting mechanism (6), rail web (7), rail foot (8), with dashed line the zone of the rail web extending along rail web and through rail head is shown.

Figure 2 presents rail head, showing rail head (1), borehole (2), sleeve (3), lubricant supply line (4).

Method according this invention comprises the following steps:

- drilling of a borehole through rail head (1) in such a way that said borehole (2) does not intersect with rail web (7) zone, said zone comprising edge of said zone of rail web (7), said zone extending along said rail web (7) through said rail head

(i);

- inserting of lubricant supply line (4) in such a way that outer wall of said lubricant supply line (4) forms loose fit with said borehole (2);

fixing of said lubricant supply line (4) within said borehole (2).

Fixing of said lubricant support line (4) can be performed in two ways.

The first way of fixing of said lubricant support line (4) comprises following additional steps to above described method: insertion of head of a sleeve (3) at the first end of said sleeve (3), said first end preferably narrowed, into said lubricant supply line (4), wherein said lubricant supply line (4) is already inside said borehole (2);

- pushing of said sleeve (3) into said lubricant supply line (4) in such a way that a tight fit is formed between outer wall of said lubricant supply line (4) and inner wall of said borehole (2), and further in such a way that the second end of said sleeve (3) being distal from said first end of said sleeve (3) is under a surface of said rail head (1) so a wheel of a rolling stock (5) does not come into contact with said sleeve (3).

The second way of fixing of said lubricant support line (4) comprises following additional steps to above described method:

insertion of a sleeve (3) into said lubricant supply line (4) wherein said lubricant supply line (4) is not yet inside said borehole (2);

- pushing of said lubricant supply line (4) comprising said sleeve (3) into said borehole (2) in such a way that tight fit between outer wall of said lubricant supply line (4) and internal wall of said borehole (2) is formed, in such a way that the second end of said sleeve (3) being distal from said first end of said sleeve (3) is under a surface of said rail head (1) so a wheel of a rolling stock (5) does not come into contact with said sleeve (3).

The method according to this invention further comprises step of lubricating with said lubricant, preferably composite heavy fluid compound (CHFC) wherein said lubricant is supplied through lubricant supply line (4) and through said sleeve (3) onto surface of rail head (1).

Rail head lubrication borehole according to this invention comprises borehole (2), extending essentially in straight line between upper surface of rail head (1) and lower surface of said rail head (1) in such a way that said borehole (2) ends at rail web (7) in such a way that it does not intersect of rail web (7) zone, said rail web (7) zone comprising edge of said rail web (7) zone, said zone extending along said rail web (7) through rail head (1). Lubrication borehole further comprises lubricant supply line (4) which forms a tight fit (2) by means of a sleeve (3), said sleeve (3) pushed inside said lubricant supply line (4) in such a way that head of said sleeve (3) at the first end of said sleeve (3), said first end of said sleeve (3) preferably narrowed, is inserted into lubricant supply line (4), wherein the second end of said sleeve (3) being distal to said first end of said sleeve (3) is below surface of said rail head (1) in such a way that wheel of a rolling stock (5) is not in contact with said sleeve (3).

According to the embodiment said borehole (2) is comprised of a single borehole, said borehole for individual dosage point starting at the upper part of said rail head (1) (on side, or on the top of said rail head (1)), and ends always under rail head close to rail web without imposing into a rail web (7) zone shown in figure 1 as an area limited with dashed lines. In such a way there is enough space, preferably around 20 mm (Figure 1), said space marked with (6) in Figure 1, under rail head for uninterrupted traversing of rail lifting mechanism (also called "plate") for lifting of rail during rail maintenance and/or regulation without damaging connections or lubricant supply line (4). Due to such embodiment there is no need to disassemble or remove connecting elements of dosing device (i.e. device for applying correct dose of a lubricant to said rail during predetermined time period). Into lubricant supply line (4) said sleeve (3) is pushed (built into), preferably as thin walled metal tube, in such a way that in predetermined (pushed into) part the outside diameter of lubricant supply line (4) is increased to inner diameter of said borehole (2). Said sleeve (3) has on its distal part relative to lubricant supply line (4) any form of dosage opening, preferably round or in form of a slit, whereby effectiveness of dosage for particular application is increased. Said lubricant supply line (4) is pushed through borehole (2) into said rail head (1) as far as possible, limited by expansion caused by said sleeve (3) inserted in said lubricant supply line (4). Part of said lubricant supply line (4) comprising said sleeve (3) is then forced inside said rail head as far as possible so said distal part of said sleeve (3) is not in contact with said wheel (5) of rolling stock. In such a way said lubricant supply line (4) cannot move its position within said borehole (2) due to pressure of said wheel (5) or due to vibrations while being sealed and preventing exit of material back through said borehole (2). There are several advantages of this solution: easier embodiment of said borehole (2), easier connection of lubricant supply line (4), easier replacement of lubricant supply line (4) or connection for dosage of said lubricant, and reduction of maintenance cost as no intervention into dosage device is necessary during maintenance - machine regulation or measurements of rails using measurement train.

For control, regulation, and optimization of this method a computer program running on general purpose computer can be utilized, said computer program comprising programming means for performing of any step according any previous described step.

It is self evident that this solution can be performed in different embodiment not changing essence of this invention.