EP1178154A1 - Rail profile grinder - Google Patents

Abstract

The railway rail profile grinder has a chassis (4) with rollers (5-8) at its ends to engage the rail (6) to be ground. a balance (11-134) engages on the other rail (2) of the track and is pivotally mounted on the chassis, which also has positioning arm (10). An internal combustion engine (14) can be fixed on a support (16) pivoted on the balancer. The motor output shaft has a transmission (20) to the grinding wheel.

Description

The present invention relates to a rail profile grinder, intended for new work and maintenance of railway tracks and similar raceways, especially in the transport sector railway, mining and handling.

A rail profile grinder is a machine designed for grind the head of a rail, mainly after track welding, with a view to to give the weld zone a profile identical to the current profile of the rail. Of usual way, the grinding operations of a rail profile concement also the top of the rail as well as the two sides of the rail head, turned respectively on the inside and outside of the track.

More particularly, the invention aims to improve a grinder rail profiles, of the type comprising a grinding head receiving a tool grinding abrasive, rotatably mounted about an axis and able to also describe a up / down movement parallel to its axis of rotation, the head grinding being carried by a chassis provided at its ends with means for rolling, guiding and holding on a rail of a railway track or the like, the grinder further comprising motorized means for driving in rotation of the grinding tool about its axis, and of the operating means for moving the grinder back and forth in the direction longitudinal of the rail to be ground, the chassis being pivotable with the grinding head around a longitudinal axis so as to allow the grinding of the choice above the rail, or on the side of the rail head on the inside of the track, or the side of the rail head on the outside of the track.

In such a machine, the chassis and the grinding head carried by this chassis can be tilted at will on one side or the other of the rail, from a substantially vertical starting position, to allow the grinding of the top of the rail or of one or other of the sides of the mushroom rail.

Regarding the motorized drive means in rotation of the grinding tool, some grinders use a internal combustion, which is in itself an interesting solution because the grinders are most often used in outdoor places where has no electric or hydraulic power source. The use of a However, the engine poses specific problems for grinders of the kind here concerned.

So in a grinder of this kind produced previously by the Applicant, and marketed under the name "MP 12", the engine is directly carried by the chassis, the motor output shaft being parallel to the axis of rotation of the grinding tool. As a result, this motor tilts with the chassis and with the grinding head, when these parts are used in an inclined position. However, the operation of a internal combustion is called into question by an excessive tilt, which poses in particular problems of carburation and lubrication, which can lead a reduction in engine life.

In another known embodiment, described in the application for German patent N ° 19518457, the internal combustion engine is carried by the grinder operating arm, held in a vertical plane, not carried by the chassis of the grinder, so that this motor remains substantially straight, even if the chassis is tilted. However, such realization requires, between the output shaft of the engine and the tool grinding, a complex, unreliable and costly motion transmission, which in the implementation according to the mentioned German patent application successively includes: a flexible shaft, a pinion angle gear conical, a universal joint and a belt.

The present invention aims to avoid all these drawbacks, by providing a simple and reliable solution for motion transmission between the engine, in particular the thermal engine and the grinding tool, while limiting the inclination of this motor at low angle values, ensuring good operation and longevity of said engine.

The invention also aims to provide a grinder of rail profiles allowing a more ergonomic and less working position tiring for the operator.

To this end, the invention essentially relates to a grinder rail profiles of the kind indicated in the introduction, in which the means motors for rotating the grinding tool are constituted by a especially internal combustion engine, with horizontal output shaft, the motor being fixed on a support which is articulated around a longitudinal axis, on a balancing assembly itself mounted to pivot about an axis longitudinal on the chassis, and designed to occupy a position in use horizontal resting on the other rail of the track, while the output shaft horizontal of the engine is linked, by a transmission assembly, to the head of grinding carried by the chassis, so as to limit the inclination of the motor to low angle values.

Thus, the invention proposes a particular mounting of the engine, in particular a thermal engine, this engine being fixed on a support mounted to pivot about a horizontal axis, on a balancing assembly itself occupying an invariably horizontal position during use. of the grinder. The motor is also linked to the chassis by the transmission assembly which, in a preferred embodiment of the invention, comprises a transmission casing forming a sort of connecting rod, articulated between the motor output shaft and a horizontal axis linked to the chassis or to the grinding head. Thus, the mounting of the heat engine is achieved by an articulated device forming a kind of deformable quadrilateral, which is such that the inclination on the horizontal of the pivoting support of the engine, therefore of the engine itself, remains small and in particular does not not exceed about 15 °, while the chassis carrying the grinding head is tiltable ^± 90 ° on one side or the other, relative to its vertical center position.

Advantageously, spring means are provided, which act on the pivoting support of the engine in particular thermal to compensate for the weight of this engine. These spring means, which relieve the efforts to exercise by the operator, can be produced in the form of a gas spring, or any other type, articulated between the balancing assembly and the pivoting support of the engine.

The transmission assembly comprises, in a form of embodiment of the invention, a drive gear carried by the output shaft horizontal of the engine, a toothed belt housed in the housing transmission, a receiving gear wedged on a horizontal shaft mounted rotating along the horizontal axis of articulation of the transmission casing on the chassis or on the grinding head, and a bevel gear with bevel gears linking this latter shaft to a sleeve coaxial with the grinding tool, and linked by splines on a shaft carrying the grinding tool.

This gives a simple, light transmission assembly, protected, maintenance-free and reliable. Advantageously, for the movement is conveniently entered into the grinding head, the chassis has two offset longitudinal sections, the horizontal shaft mounted along the axis of articulation of the transmission housing entering the head of grinding at the level of the "offset" existing between the two sections of the frame.

According to another advantageous characteristic, the assembly balancing comprises, on the one hand, a hoop connecting the ends together of the chassis, and pivoting by its own ends, around a longitudinal axis, relative to this chassis, and on the other hand a transverse balancing bar, detachably attached to the middle part of the arch, and provided with a roller or support roller provided to rest and roll on the other rail of the way. The pivoting motor support can be articulated on a fixed yoke, it also, in the middle part of the arch, at a distance from the axis of articulation of the roll bar on the chassis.

According to yet another characteristic, taking into account that the chassis of the grinder that is the subject of the invention can be inclined over ^± 90 ° on one side or the other, relative to its vertical median position, the maneuvering means for the reciprocating movement of the grinder advantageously comprise an orientable operating arm, pivotally mounted about a longitudinal axis on the chassis, means being provided for blocking the operating arm in a selected angular position. The operating arm can thus be oriented ^± 45 °, on either side of a middle position, to maintain an ergonomic position of use, even if the chassis, which carries this operating arm, is lying on the floor. horizontal.

According to a final advantageous characteristic, the chassis of the grinder object of the invention carries, at each end, a set of two rollers for guiding parallel axes, mounted on a common support itself mounted rotating about a longitudinal axis relative to the end corresponding chassis, on which is also pivotally mounted a end of the balancing assembly, a gear link connecting the support of the guide rollers at the end of the balancing assembly, and / or to the chassis, so that the pivoting of this assembly relative to the chassis is accompanied by a proportional orientation of the guide rollers. The inclination of the chassis and the grinding head is thus accompanied by a "automatic" orientation of the guide rollers, which assume a position adapted according to whether the interior or exterior side of the mushroom is ground of the rail.

Figure 1 est une vue d'ensemble, en perspective, d'une meuleuse conforme à la présente invention, en position de meulage du dessus d'un rail ;

Figure 2 est une vue en bout de la meuleuse, dans la position d'utilisation de figure 1 ;

Figure 3 est une vue d'ensemble, en perspective, de la meuleuse des figures précédentes, en position de meulage du flanc du champignon du rail, du côté intérieur de la voie.

Figure 4 est une vue en bout de la meuleuse, dans la position d'utilisation de figure 3 ;

Figure 5 est une vue d'ensemble, en perspective, de la meuleuse des figures précédentes, en position de meulage du flanc du champignon du rail, du côté extérieur de la voie ;

Figure 6 est une vue en bout de la meuleuse, dans la position d'utilisation de figure 5 ;

Figure 7 représente, en coupe, un détail du mécanisme d'entraínement de cette meuleuse ;

Figure 8 est une vue de détail en coupe, suivant VIII-VIII de figure 9, montrant le détail des galets de guidage et de leur montage ;

Figure 9 est une vue en coupe suivant IX-IX de figure 8, correspondant au même détail.

The invention will be better understood with the aid of the following description, with reference to the appended schematic drawing representing, by way of example, an embodiment of this rail profile grinder:

Figure 1 is an overall perspective view of a grinder according to the present invention, in the grinding position from above a rail;

Figure 2 is an end view of the grinder, in the position of use of Figure 1;

Figure 3 is an overall perspective view of the grinder of the previous figures, in the grinding position of the side of the head of the rail, on the inside of the track.

Figure 4 is an end view of the grinder, in the position of use of Figure 3;

Figure 5 is an overall perspective view of the grinder of the previous figures, in the grinding position of the side of the head of the rail, on the outside of the track;

Figure 6 is an end view of the grinder, in the position of use of Figure 5;

Figure 7 shows, in section, a detail of the drive mechanism of this grinder;

Figure 8 is a detail view in section along VIII-VIII of Figure 9, showing the detail of the guide rollers and their mounting;

Figure 9 is a sectional view along IX-IX of Figure 8, corresponding to the same detail.

As shown in Figures 1 to 6, the rail profile grinder is intended for work on rails 1 and 2 of a railway track, and it is more particularly designed to profile the fungus 3 of one of the rails 1 of the track, on which this grinder is positioned and guided.

The grinder has an elongated frame 4, which is provided at its two ends, of two trains of three carrier rollers, respectively 5 and 6. At its ends, the chassis 4 is still provided with two sets of rollers guide, respectively 7 and 8.

In its middle part, the chassis 4 carries a grinding head 9, and an adjustable operating arm 10.

A hoop 11 connects the two ends of the chassis 4, the hoop 11 being pivotally mounted about a longitudinal axis with respect to the chassis 4. On the middle part of the arch 11 is removably attached to a bar cross balancing 12, provided with a roller or support roller 13 at its free end.

Between the frame 4 and the hoop 11 is mounted, in a described manner in detail below, an internal combustion engine 14, such as a four-stroke explosion, intended for the rotational drive of an abrasive tool grinding 15, rotatably mounted in the grinding head 9 (see also Figure 7).

For its use, the grinder whose general structure comes to be described is placed on the track, the chassis 4 being mounted and guided on the rail 1 by the rollers 5, 6, 7 and 8, while the roller or roller 13 is supported on the other rail 2. The grinding head 9 is thus positioned opposite the rail 3 mushroom 1.

The motor 14 is fixed on a support 16, oriented transversely, which is articulated around a longitudinal axis 17 on a yoke 18 itself fixed on the arch 11, in the middle part thereof, at a distance from the axis hinge 11 on the chassis 4. This motor 14 has a shaft horizontal outlet 19, oriented longitudinally, which is connected to a casing transmission 20 forming a kind of connecting rod, articulated between the shaft 19 and a horizontal axis 21, parallel to the shaft 19 and linked to the chassis or the head of grinding 9.

A gas spring 22, articulated between the arch 11 and the support 16 (see Figures 2, 4 and 6), compensates for the weight of the motor 14 and its support 16.

The chassis 4 has two offset longitudinal sections, respectively 4a and 4b, the "setback" existing between these two sections 4a and 4b allowing the connection of the transmission casing 20 along the axis horizontal articulation 21, facing the end of the first section 4a of the chassis 4.

L'extrémité de l'arbre de sortie 19 du moteur 14, située à l'intérieur du carter de transmission 20, porte une roue dentée motrice 24 sur laquelle passe une courroie crantée 25, logée dans ledit carter 20. La courroie crantée 25 passe aussi sur une roue dentée réceptrice 26, calée sur un arbre 27 monté tournant suivant l'axe horizontal 21 et entrant dans un boítier de renvoi d'angle de la tête de meulage 9. A son extrémité intérieure, l'arbre 27 porte un pignon conique 28, en prise avec une couronne dentée conique 29 montée suivant l'axe 23 de l'outil de meulage 15. La couronne dentée 29 est liée en rotation avec un manchon 30, monté tournant suivant l'axe 23 dans des paliers superposés 31 et 32. Le manchon 30 est lui-même lié en rotation, avec possibilité de coulissement axial grâce à des cannelures 33, avec un arbre 34 qui porte, à une extrémité, l'outil de meulage 15. Un dispositif de manoeuvre à volant 35, avec butée intégrée, permet de régler la position axiale de l'arbre 34, donc de l'outil de meulage 15, la profondeur de meulage étant ainsi réglable.

Les deux trains de galets porteurs 5 et 6, prévus respectivement aux deux extrémités du châssis 4, sont montés fixes par rapport à ce châssis 4, et servent de prise de référence pour le meulage, en s'appuyant et en roulant sur la surface à meuler du champignon 3 du rail 1.

Les deux ensembles de galets de guidage 7 et 8 sont montés, chacun, pivotants autour d'un axe longitudinal, sur l'extrémité correspondante du support 4. Comme le montrent plus en détail les figures 8 et 9, chaque ensemble 7 ou 8 comprend deux galets de guidage 36 d'axes parallèles, montés sur un support commun 37, l'écartement des deux galets de guidage 36 étant réglable pour s'adapter à la largeur du champignon 3 du rail 1. Le support 37 possède une large ouverture circulaire, dans laquelle est montée, et immobilisée en rotation, une couronne dentée intérieurement 38.

L'extrémité correspondante de l'arceau 11 est solidarisée avec un bloc de montage 39, qui est monté pivotant autour d'un axe 40 solidaire de l'extrémité du châssis 4. Le bloc de montage 39 possède un moyeu circulaire 41, autour duquel le support 37 est monté tournant par son ouverture circulaire. Dans cette position, la couronne dentée 38 solidaire du support 37 vient en prise avec un pignon fixe 42, solidaire de l'axe 40, le nombre de dents du pignon 42 étant égal, ou sensiblement égal, à la moitié du nombre de dents de la couronne 38.

Figure 7 shows the detail of the transmission mechanism, which ensures, from the motor 14, the rotational drive of the grinding tool 15 around its axis 23:

The end of the output shaft 19 of the motor 14, located inside the transmission casing 20, carries a drive gear 24 over which passes a toothed belt 25, housed in said casing 20. The toothed belt 25 passes also on a receiving toothed wheel 26, wedged on a shaft 27 mounted rotating along the horizontal axis 21 and entering a gearbox of angle of the grinding head 9. At its inner end, the shaft 27 carries a pinion bevel 28, engaged with a bevel gear 29 mounted along the axis 23 of the grinding tool 15. The gear 29 is linked in rotation with a sleeve 30, mounted rotating about the axis 23 in superimposed bearings 31 and 32. The sleeve 30 is itself linked in rotation, with the possibility of axial sliding by means of grooves 33, with a shaft 34 which carries, at one end, the grinding tool 15. A handwheel operating device 35 , with integrated stop, allows to adjust the has an axial position of the shaft 34, therefore of the grinding tool 15, the grinding depth being thus adjustable.

The two carrier roller trains 5 and 6, provided respectively at the two ends of the chassis 4, are mounted fixed relative to this chassis 4, and serve as a reference point for grinding, by resting and rolling on the surface to grind the mushroom 3 of the rail 1.

The two sets of guide rollers 7 and 8 are each mounted to pivot about a longitudinal axis on the corresponding end of the support 4. As shown in more detail in FIGS. 8 and 9, each set 7 or 8 comprises two guide rollers 36 with parallel axes, mounted on a common support 37, the spacing of the two guide rollers 36 being adjustable to adapt to the width of the head 3 of the rail 1. The support 37 has a large circular opening , in which is mounted, and immobilized in rotation, an internally toothed ring 38.

The corresponding end of the arch 11 is secured to a mounting block 39, which is pivotally mounted about an axis 40 integral with the end of the chassis 4. The mounting block 39 has a circular hub 41, around which the support 37 is mounted to rotate by its circular opening. In this position, the ring gear 38 secured to the support 37 engages with a fixed pinion 42, integral with the axis 40, the number of teeth of the pinion 42 being equal, or substantially equal, to half the number of teeth of crown 38.

Finally, referring again to Figures 1 to 6, the arm of maneuver 10 is pivotally mounted on the first section 4a of the chassis 4, around a longitudinal axis 43, so that it can be adjusted in a plane transverse, and means are provided for immobilizing said arm of operation 10 in the selected angular position. These means comprise a transverse plate 44, integral with the chassis 4 and provided a light in an arc 45, crossed by a screw secured to the arm 10, on which is tightened a locking nut 46 carrying a handle 47.

• L'arceau 11 et la barre d'équilibrage 12 sont situés dans un plan horizontal.
• Le support 4 se situe dans un plan vertical, au-dessus du rail 1 à meuler.
• Le bras de manoeuvre 10 occupe sa position médiane de sorte qu'il est, lui aussi, orienté verticalement.
• Les galets porteurs 5 et 6 s'appliquent tous horizontalement sur le dessus du rail 1.
• Les deux galets de guidage 36 de chacun des deux ensembles 7 et 8 prennent place, verticalement, de part et d'autre du rail 1.
• Le moteur 14 possède, avec son support 16, une position assez faiblement inclinée sur l'horizontale.

Figures 1 and 2 illustrate the use of the grinder described above, for grinding the top of the head 3 of the rail 1. For this first use, the positions are as follows:

• The arch 11 and the balancing bar 12 are located in a horizontal plane.
• The support 4 is located in a vertical plane, above the rail 1 to be ground.
• The operating arm 10 occupies its middle position so that it, too, is oriented vertically.
• The support rollers 5 and 6 all apply horizontally to the top of the rail 1.
• The two guide rollers 36 of each of the two assemblies 7 and 8 take place, vertically, on either side of the rail 1.
• The motor 14 has, with its support 16, a relatively slightly inclined position on the horizontal.

In this position of the grinder, starting the engine 14, and the back-and-forth movement (arrow F) of the entire machine using the operating arm 10 along the track, ensure the grinding of the above the rail 1 by the tool 15, driven in rotation from the motor 14.

• L'arceau 11 et la barre d'équilibrage 12 sont encore situés dans un plan horizontal.
• Le support 4 se situe, lui aussi, dans un plan horizontal, et il se trouve ainsi orienté en direction de l'autre rail 2.
• Le bras de manoeuvre 10 est orienté, par rapport au châssis 4, de manière à se trouver relevé, obliquement.
• Les galets porteurs 5 et 6 s'appliquent tous verticalement sur le flanc intérieur du champignon 3 du rail 1.
• Les deux galets de guidage 36 de chacun des deux ensembles 7 et 8 prennent une orientation oblique, sensiblement à 45°, en s'orientant ainsi de façon automatique par l'effet de l'engrenage constitué de la couronne dentée 38 et du pignon 42.
• Le moteur 14 possède, avec son support 16, une position pratiquement horizontale, très légèrement inclinée en sens inverse de l'inclinaison de la position des figures 1 et 2.

FIGS. 3 and 4 illustrate the use of the same grinder, for grinding the side of the head 3 of the rail 1 located on the inside of the track, that is to say the side facing the other rail 2. For this second use, the positions are as follows:

• The arch 11 and the balancing bar 12 are still located in a horizontal plane.
• The support 4 is also located in a horizontal plane, and it is thus oriented in the direction of the other rail 2.
• The operating arm 10 is oriented, relative to the chassis 4, so as to be raised, obliquely.
• The support rollers 5 and 6 all apply vertically to the inner flank of the mushroom 3 of the rail 1.
• The two guide rollers 36 of each of the two assemblies 7 and 8 assume an oblique orientation, substantially at 45 °, thereby being oriented automatically by the effect of the gear formed by the ring gear 38 and the pinion 42 .
• The motor 14 has, with its support 16, a practically horizontal position, very slightly inclined in the opposite direction to the inclination of the position of FIGS. 1 and 2.

In this other position of the grinder, starting the motor 14, and the back-and-forth movement (arrow F) of the whole of the machine using the operating arm 10, along the track, ensure the grinding of the inner side of the head 3 of the rail 1.

• L'arceau 11 et la barre d'équilibrage 12 sont toujours situés dans un plan horizontal.
• Le support 4 se situe, lui aussi, dans un plan horizontal, et il se trouve ainsi orienté vers l'opposé de l'autre rail 2.
• Le bras de manoeuvre 10 est orienté, par rapport au châssis 4, à l'opposé de la position des figures 3 et 4, pour se trouver ici aussi relevé obliquement.
• Les galets porteurs 5 et 6 s'appliquent tous verticalement sur le flanc extérieur du champignon 3 du rail 1.
• Les deux galets de guidage 36 de chacun des deux ensembles 7 et 8 prennent une orientation oblique, sensiblement à 45° (mais inverse de celle des figures 3 et 4), en s'orientant ici aussi de façon automatique par l'effet de l'engrenage constitué de la couronne dentée 38 et du pignon 42.
• Le moteur 14 possède, avec son support 16, une position assez faiblement inclinée sur l'horizontale, en sens inverse de l'inclinaison de la position des figures 1 et 2.

Finally, Figures 5 and 6 illustrate the use of the same grinder, for grinding the side of the mushroom 3 of the rail 1 facing the outside of the track, that is to say the side facing away to the other rail 2. For this third use, the positions are as follows:

• The arch 11 and the balancing bar 12 are always located in a horizontal plane.
• The support 4 is also located in a horizontal plane, and it is thus oriented opposite the other rail 2.
• The operating arm 10 is oriented, relative to the chassis 4, opposite the position of Figures 3 and 4, to be here also raised obliquely.
• The supporting rollers 5 and 6 all apply vertically to the outer flank of the mushroom 3 of the rail 1.
• The two guide rollers 36 of each of the two assemblies 7 and 8 take an oblique orientation, substantially at 45 ° (but opposite to that of FIGS. 3 and 4), being oriented here also automatically by the effect of the gear consisting of the toothed ring 38 and the pinion 42.
• The motor 14 has, with its support 16, a position which is slightly inclined on the horizontal, in the opposite direction to the inclination of the position of FIGS. 1 and 2.

In this last position of the grinder, starting the motor 14, and the back-and-forth movement (arrow F) of the whole of the machine using the operating arm 10, along the track, ensure the grinding of the outer side of the head 3 of the rail 1.

Of course, it is also possible to bring the grinder into intermediate positions, compared to the three typical positions previously described and illustrated in the drawing, this for grinding the spokes of connection between the top of the rail 1 and the sides of the mushroom 3.

It appears from the above that the described grinder allows to grind the entire head 3 of the rail, i.e. grind the profile of this at an angle of 180 °, without the need to turn the machine, the operating arm 10 being in each case oriented so as to allow easy operation of the grinder, and the motor 14 always remaining straight or slightly inclined, so that its operation and longevity are guaranteed.

Thanks to the invention, the operator no longer has to support the weight of the motor, occupies a more ergonomic working position, is subject to less vibration and less noise, and is further away from projections sparks.

One would not depart from the scope of the invention, as defined in the appended claims, by modifying the external shape of the support, or the pivoting mounting means of the motor, or the detail of the rollers carriers and guide rollers; the invention also extends to the use of motors other than heat engines; the machine could be more complex, i.e. be extended so as to entrain two or more grindstones in a row or two rows of rails, by one or more motors.

Claims (12)

Rail profile grinder, comprising a grinding head (9) receiving an abrasive grinding tool (15), rotatably mounted about an axis (23) and able to also describe an up / down movement parallel to its axis of rotation (23), the grinding head (9) being carried by the middle part of a chassis (4) provided, at its ends, with means (5 to 8) for rolling, guiding and holding on a rail ( 1) a railroad track or the like, the grinder further comprising motorized means (14) for rotating the grinding tool (15) around its axis (23) and operating means (10) for the reciprocating movement (F) of the grinder in the longitudinal direction of the rail (1) to be ground, the frame (4) being pivotable with the grinding head (9) about a longitudinal axis so to allow the choice of grinding the top of the rail (1), or the side of the mushroom (3) of the rail (1) on the inside of the track, or the side of the mushroom gnon (3) of the rail on the outside of the track, characterized in that the motorized means for driving in rotation of the grinding tool (15) are constituted by a motor in particular internal combustion (14), with shaft horizontal outlet (19), the motor (14) being fixed on a support (16) which is articulated, around a longitudinal axis (17), on a balancing assembly (11, 12, 13) itself mounted pivoting about a longitudinal axis (40) on the chassis (4), and designed to occupy in use a horizontal position by resting on the other rail (2) of the track, while the horizontal output shaft ( 19) of the motor (14) is linked by a transmission assembly (20; 24 to 27), to the grinding head (9) carried by the chassis (4), so as to limit the inclination of the motor (14) to small angle values. Rail profile grinder according to claim 1, characterized in that the transmission assembly comprises a transmission housing (20) forming a kind of connecting rod, articulated between the output shaft (19) of the engine (14) and a horizontal axis (21) linked to the chassis (4) or to the grinding head (9). Rail profile grinder according to claim 2, characterized in that the transmission assembly comprises a drive gear (24) carried by the horizontal output shaft (19) of the motor (14), a toothed belt (25) housed in the transmission housing (20), a receiving toothed wheel (26) wedged on a horizontal shaft (27) mounted rotating along the horizontal axis (21) of articulation of the transmission housing (20) on the chassis (4 ) or on the grinding head (9), and a bevel gear with bevel gears (28, 29) connecting the latter shaft (27) to a sleeve (30) coaxial with the grinding tool (15), and linked by grooves (33) to a shaft (34) carrying the grinding tool (15). Rail profile grinder according to claim 3, characterized in that the chassis (4) has two longitudinal sections (4a, 4b) offset, the horizontal shaft (27) mounted along the axis of articulation of the transmission housing ( 20) entering the grinding head (9) at the level of the "offset" existing between the two sections (4a, 4b) of the chassis (4). Rail profile grinder according to any one of claims 1 to 4, characterized in that spring means (22) are provided, which act on the pivoting support (16) of the engine in particular thermal (14) to compensate for the weight of this motor (14). Rail profile grinder according to claim 5, characterized in that the aforementioned spring means are produced in the form of a gas spring (22), or of any other type, articulated between the balancing assembly (11 , 12, 13) and the pivoting support (16) of the motor (14). Rail profile grinder according to any one of Claims 1 to 6, characterized in that the inclination on the horizontal of the pivoting support (16) of the motor (14), therefore of the motor (14) itself, does not not exceed about 15 °, while the frame (4) carrying the grinding head (9) is tiltable by ^± 90 ° on one side or the other, relative to its vertical median position. Rail profile grinder according to any one of Claims 1 to 7, characterized in that the balancing assembly comprises, on the one hand, a hoop (11) connecting the ends of the chassis (4) to each other, and pivoting by its own ends (39), about a longitudinal axis (40), relative to this chassis (4), and on the other hand a transverse balancing bar (12), fixed in a removable manner on the middle part of the arch (11), and provided with a roller or support roller (13) intended to rest and roll on the other rail (2) of the track. Rail profile grinder according to claim 8, characterized in that the pivoting support (16) of the motor (14) is articulated (at 17) on a yoke (18) which is fixed in the middle part of the arch (11 ), away from the hinge pin of the hoop (11) on the chassis (4). Rail profile grinder according to any one of claims 1 to 9, characterized in that the operating means for the reciprocating movement (F) of the grinder comprise an adjustable operating arm (10), mounted pivoting about a longitudinal axis (43) on the chassis (4), means (44 to 47) being provided for blocking the operating arm (10) in a preselected angular position. Rail profile grinder according to any one of Claims 1 to 10, characterized in that its chassis (4) carries, at each end, a set (7, 8) of two guide rollers (36) with parallel axes , mounted on a common support (37) itself mounted rotating about a longitudinal axis relative to the corresponding end of the frame (4), on which is also pivotally mounted one end (39) of the balancing assembly (11, 12, 13), a gear link (38, 42) connecting the support (37) of the guide rollers (36) to the end (39) of the balancing assembly (11, 12, 13 ) and / or to the chassis (4), so that the pivoting of this assembly (11,12,13) relative to the chassis (4) is accompanied by a proportional orientation of the guide rollers (36). Rail profile grinder according to all of Claims 8 and 11, characterized in that each end of the arch (11) is secured to a mounting block (39), pivotally mounted about an axis (40) secured from the end of the chassis (4), the mounting block (39) having a circular hub (41) around which the support (37) of the guide rollers (36) is rotatably mounted, which support (37) has an opening circular in which is mounted an internally toothed crown (38), engaging with a pinion (42) integral with the axis (40).

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