Rail grinding machine and method for grinding a rail of a track

Abstract

A rail grinding machine (1) comprises a machine frame (6), rail guide units arranged on the machine frame (6), a grinding unit (9) with a drive motor (44) and a tool holder (47) for rotating a grinding tool (49) about a rotary axis (48), a height adjustment device (10) for adjusting the height of the grinding unit (9), and a handle (11) for manually repositioning the grinding unit (9). A guide (24) of the height adjustment device (10) defines a guide plane (E). The rotary axis (48) is spaced apart from the guide plane (E), particularly in the area of ​​the tool holder (47). This gives the rail grinding machine (1) a simple design and a high level of user-friendliness. In particular, the rail grinding machine (1) allows an unobstructed view of the grinding point.

Description

[0001] The content of the German patent application DE 10 2024 209 981.3 is incorporated herein by reference.

[0002] The invention relates to a rail grinding machine and a method for grinding a rail of a track. The rail grinding machine is, in particular, manually movable and tiltable by means of a handle. The rail grinding machine is specifically designed for manual movement and tilting on exactly one rail.

[0003] From DE 1 274 610 A (corresponding to US 3 427 758 A) a rail grinding machine for grinding a rail of a track is known. The rail grinding machine is manually movable on exactly one rail. The rail grinding machine comprises a chassis frame on which running rollers are arranged. A machine frame is mounted on the chassis frame between the running rollers. A frame section is mounted on the machine frame, which is height-adjustable relative to the machine frame and the chassis frame by means of a spindle drive. A grinding device, which includes a drive motor, is attached to the frame section. For grinding the rail, a grinding element can be rotated about a rotary axis by means of the drive motor. For profiling the rail, the machine frame with the grinding device mounted on it is pivoted relative to the chassis frame.

[0004] The invention is based on the objective of creating a rail grinding machine for grinding a rail of a track, which has a simple design and a high level of user comfort.

[0005] This problem is solved by a rail grinding machine with the features of claim 1. The rail grinding machine is movable and / or tiltable on a rail, in particular by means of the handle. This makes it possible, in particular, to profile the rail using the grinding tool by means of a top grinding and / or a side grinding. The height adjustment device is arranged on the machine frame. The grinding unit is arranged on the height adjustment device relative to the machine frame for height adjustment. Because the axis of rotation of the grinding unit is arranged at a distance from the guide plane, an improved view of the grinding tool and the grinding area on the rail is possible.The axis of rotation is spaced away from the guide plane, particularly in the area of ​​the tool holder, so that during operation of the rail grinding machine, the contact area of ​​a grinding tool held in the tool holder with the rail to be ground is spaced away from the guide plane. The axis of rotation runs substantially parallel to the guide plane. The axis of rotation is spaced away from the guide plane, particularly in a transverse direction. This transverse direction forms a normal vector to the guide plane.

[0006] The guide plane is defined or defined by the guide. If the guide comprises, for example, two guide units, the guide plane is defined by the central longitudinal axes of the guide units. The guide plane runs parallel to the longitudinal direction. If the rail grinding machine is located on a rail, the guide plane and / or the longitudinal direction runs substantially parallel to the rail or a longitudinal direction of the rail. The guide is preferably a linear guide. An adjustment direction of the guide runs perpendicular to the longitudinal direction and / or perpendicular to the transverse direction.

[0007] The rail grinding machine is specifically designed for manual movement and / or tilting on exactly one rail of a track. For this purpose, the rail grinding machine comprises exactly two rail guide units for guiding the machine on this single rail. The two rail guide units are arranged longitudinally spaced apart from each other on the machine frame. The machine frame is thus positioned longitudinally between the two rail guide units. This longitudinal direction corresponds to the longitudinal direction of the rail when the rail grinding machine is positioned on this single rail. The rail grinding machine specifically does not have a rail guide unit for guiding the machine on an adjacent rail.Because the entire rail grinding machine is tilted for grinding the rail, especially for profiling it, the grinding unit cannot be pivoted relative to the machine frame. Therefore, the grinding unit can only be moved linearly relative to the machine frame using the height adjustment device.

[0008] The height adjustment device and / or the grinding unit is preferably arranged longitudinally between the rail guide units. The rail guide units define a longitudinal axis. The guide plane is arranged transversely spaced from the longitudinal axis of the rail guide units. The grinding unit is preferably arranged on one side of the guide plane facing the longitudinal axis. Preferably, the rail guide units are pivotable about the longitudinal axis relative to the machine frame. The handle is preferably pivotable about the longitudinal axis together with the rail guide units. For this purpose, the handle is, for example, fixedly or lockably attached to the rail guide units. The handle can be pivotable and lockable relative to the rail guide units. The handle is preferably U-shaped. The handle is arranged laterally spaced from the guide plane.

[0009] The height adjustment device includes, in particular, a spindle drive for adjusting the height of the grinding unit. The spindle drive includes a spindle axis. The spindle axis can be arranged in the guide plane or at a distance from the guide plane. Preferably, the spindle axis is arranged at a distance from the guide plane in the area of ​​the tool holder. The spindle axis can be arranged at a distance from the axis of rotation. The spindle axis can be arranged such that, in the area of ​​the tool holder, the spindle axis lies between the guide plane and the axis of rotation, or the axis of rotation lies between the guide plane and the spindle axis in the area of ​​the tool holder, or the guide plane lies between the spindle axis and the axis of rotation in the area of ​​the tool holder.

[0010] The drive motor rotates the tool holder around its axis of rotation. During operation of the rail grinding machine, a grinding tool is attached to or within the tool holder. The grinding tool can be rotated around its axis of rotation via the tool holder by means of the drive motor. The tool holder is designed, for example, as a flange to which the grinding tool is attached or bolted. For grinding the rail, the grinding unit and the grinding tool driven by it can be moved and / or tilted relative to the rail being ground using the handle. Because the axis of rotation of the tool holder is positioned at a distance from the guide plane, the guide does not obstruct the view of the rail head and the grinding tool, ensuring that the rail head and the grinding tool are fully visible to the operator.The design for the spaced arrangement of the rotary axis from the guide plane is simple. The rail grinding machine therefore has a simple design and a high level of user-friendliness.

[0011] A rail grinding machine according to claim 2 ensures a simple design and high ease of operation. The distance A of the axis of rotation from the guide plane in the transverse direction ensures an unobstructed view of the rail head and the grinding tool for the operator. The axis of rotation is spaced from the guide plane by a distance A, particularly in the area of ​​the tool holder. This distance A is essentially constant but can vary slightly depending on the angular position of the axis of rotation. Preferably, the distance A of the axis of rotation from the guide plane lies within the claimed area throughout the entire area of ​​the tool holder. The grinding unit comprises the drive motor and the tool holder, which can be rotated by means of the drive motor. Preferably, a grinding tool is held or attached in or to the tool holder. The grinding tool is, for example, designed as a grinding wheel.Preferably, the drive motor and / or the tool holder and / or the grinding tool do not intersect the guide plane. The distance A is selected accordingly for this purpose.

[0012] A rail grinding machine according to claim 3 ensures a simple design and high ease of operation. The machine frame is specifically designed as a machine frame. For this purpose, the machine frame comprises the lower longitudinal beam and the upper longitudinal beam, as well as a first side beam and a second side beam. The side beams connect the lower longitudinal beam and the upper longitudinal beam to form the machine frame. Viewed longitudinally, the guide is attached between the side beams to the lower longitudinal beam and the upper longitudinal beam. The guide is attached directly and / or indirectly to the lower longitudinal beam and / or to the upper longitudinal beam. For example, the guide is attached to the upper longitudinal beam indirectly via a spindle drive carrier. The guide is, in particular, a linear guide.The guide system comprises, in particular, at least two guide units, which are attached to the lower and upper longitudinal beams at longitudinal intervals. The guide units are attached directly and / or indirectly. The guide units are thus arranged between the side beams. The lower and / or the upper longitudinal beam has a curved shape. The curved shape extends, in particular, in the transverse direction away from the axis of rotation. Preferably, the lower longitudinal beam extends away from the axis of rotation in a curved shape from the rail guide units. Similarly, the side beams and / or the upper longitudinal beam extend away from the axis of rotation in a curved shape.

[0013] A rail grinding machine according to claim 4 ensures a simple design and high ease of operation. The at least one guide unit defines the guide plane and the adjustment direction. The adjustment direction is, in particular, parallel to the guide plane. Preferably, the adjustment direction is perpendicular to the longitudinal and / or transverse direction. The at least one guide unit serves, in particular, to form a linear guide. The at least one guide unit is arranged on the machine frame, in particular on a lower longitudinal beam and an upper longitudinal beam. The at least one guide unit is, in particular, arranged between two side beams that connect the lower longitudinal beam and the upper longitudinal beam. The at least one guide unit is attached directly and / or indirectly to the lower longitudinal beam and / or the upper longitudinal beam.Preferably, the guide comprises at least two guide units arranged at a distance from each other in the longitudinal direction on the machine frame. The at least two guide units preferably run parallel to each other and define the guide plane and the adjustment direction. For example, the central longitudinal axes of the at least two guide units define the guide plane.

[0014] A rail grinding machine according to claim 5 ensures a simple design and high ease of use. The guide serves to adjust the height of the grinding unit. For this purpose, the grinding unit is arranged on the guide. The at least one damping element serves to dampen vibrations and / or decouple the handle. Vibrations caused by the grinding process and the drive motor, which are transmitted from the grinding unit to the guide, are dampened by the at least one damping element and thus at least partially decoupled from the handle. The at least one damping element is arranged between the guide element and the machine frame. Preferably, the at least one damping element is arranged between the guide element and a lower longitudinal beam and / or between the guide element and an upper longitudinal beam. The guide element is, for example, designed as a guide rod.The guide rod, for example, has a round, oval, or polygonal cross-section. The guide rod can be hollow.

[0015] A rail grinding machine according to claim 6 ensures a simple design and high ease of use. The respective guide element is arranged between the lower damping element and the upper damping element. The lower damping element and the upper damping element are arranged on the machine frame. Preferably, the lower damping element is arranged on a lower longitudinal beam and the upper damping element on an upper longitudinal beam. The lower damping element and / or the upper damping element is attached directly and / or indirectly to the lower longitudinal beam and / or the upper longitudinal beam. The lower damping element and the upper damping element enable improved vibration damping and / or vibration decoupling of the handle.

[0016] A rail grinding machine according to claim 7 ensures a simple design and high ease of operation. Due to the different spring stiffnesses, the damping elements prevent unwanted oscillation of the grinding unit. The at least one guide unit, due to its different spring stiffnesses, acts in particular as a fixed-floating bearing. Preferably, the spring stiffness of the lower damping element is greater than the spring stiffness of the upper damping element.

[0017] A rail grinding machine according to claim 8 ensures a simple design and high ease of operation. The carriage allows for easy attachment of the grinding unit to the guide and / or easy height adjustment of the grinding unit by means of a spindle drive. The carriage comprises, in particular, at least a first carriage section to which the grinding unit is attached, and a second carriage section to which the spindle drive is attached. The second carriage section extends, in particular, transversely to the first carriage section. The spindle drive is, in particular, arranged between the carriage, especially the second carriage section, and the machine frame, especially the upper longitudinal beam.

[0018] A rail grinding machine according to claim 9 ensures a simple design and high ease of operation. Preferably, the grinding unit and the spindle drive are attached to the carriage. The grinding unit is particularly attached to a first carriage section, whereas the spindle drive is attached to a second carriage section. The second carriage section extends, in particular, transversely to the first carriage section. Preferably, the spindle drive is mounted between the carriage, in particular the second carriage section, and the machine frame, in particular an upper longitudinal beam. Because the grinding unit and the spindle drive are mounted independently of each other on the carriage, the operator has an unobstructed view of the grinding unit, in particular the grinding tool and an associated grinding point.

[0019] A rail grinding machine according to claim 10 ensures a simple design and high ease of operation. Because the spindle axis is spaced transversely from the guide plane, the spindle drive can be arranged at a distance from the machine frame. This simplifies the design. Preferably, the height adjustment device comprises a spindle drive carrier that is attached to the machine frame, particularly to the upper longitudinal beam, and on which the spindle drive is mounted. Preferably, a spindle nut of the spindle drive is attached to the spindle drive carrier, while a spindle of the spindle drive is rotatably mounted on the carriage. For manual operation, the spindle drive includes, in particular, a handwheel. Preferably, the spindle axis is arranged transversely from the axis of rotation, particularly in the area of ​​the tool holder.This prevents any obstruction of the view of the rail head and the grinding tool.

[0020] A rail grinding machine according to claim 11 ensures a simple design and high ease of operation. Because the spindle axis, viewed in the transverse direction, runs between the guide plane and the axis of rotation, the spindle drive can be easily attached to the machine frame, and a substantially unobstructed view of the rail head and the grinding tool is possible. The spindle axis runs, particularly in the area of ​​the tool holder, between the guide plane and the axis of rotation. The spindle axis runs, in particular, parallel to the guide plane and / or the axis of rotation. Preferably, the spindle axis has a distance B in the transverse direction from the guide plane, where: 1 cm ≤ B < 40 cm, in particular 3 cm ≤ B ≤ 30 cm, in particular 4 cm ≤ B ≤ 20 cm, and in particular 5 cm ≤ B ≤ 10 cm. In particular, B < A. Preferably, the spindle axis has a distance B from the guide plane in the area of ​​the tool holder.

[0021] A rail grinding machine according to claim 12 ensures a simple design and high ease of operation. Preferably, the machine frame comprises a lower longitudinal beam, an upper longitudinal beam, and side beams. The side beams connect the lower longitudinal beam to the upper longitudinal beam. The spindle drive can be attached directly or indirectly to the upper longitudinal beam. For example, the spindle drive can be attached to the upper longitudinal beam via a spindle drive bracket. The arrangement of the spindle drive on the upper longitudinal beam allows for simple and precise guidance of the grinding unit. Preferably, the height adjustment device includes a spindle drive bracket attached to the upper longitudinal beam. A spindle nut of the spindle drive is attached to the spindle drive bracket, while a spindle of the spindle drive is rotatably mounted on the carriage.The spindle drive includes, in particular, a handwheel for operation.

[0022] A rail grinding machine according to claim 13 ensures a simple design and high ease of use. The at least one damping element serves in particular to dampen and / or decouple vibrations from a handwheel of the spindle drive. The at least one damping element is arranged, for example, between a slide and the spindle drive and / or between the spindle and the handwheel.

[0023] A rail grinding machine according to claim 14 ensures a simple design and high ease of use. Because the axis of rotation, particularly in the area of ​​the tool holder, is arranged on the side of the guide plane facing the handle, the grinding unit is positioned in a space between the guide plane and the handle. This allows the rail grinding machine to be easily and comfortably moved and / or tilted by an operator using the handle, while simultaneously enabling simple height adjustment and an unobstructed view of the rail head and the grinding area.

[0024] A rail grinding machine according to claim 15 ensures a simple design and high ease of use. Because the axis of rotation, particularly in the area of ​​the tool holder, and optionally also the spindle axis, are arranged on a side of the guide plane facing away from the handle, a particularly unobstructed view of the rail head and the grinding point is possible.

[0025] A rail grinding machine according to claim 16 ensures a simple design and high ease of use. The two rail guide units are arranged longitudinally spaced apart from each other on the machine frame. The longitudinal direction runs essentially parallel to the longitudinal axis of the rail to be ground. Because the two rail guide units are pivotable about their longitudinal axis relative to the machine frame, different processing positions can be set for the two rail guide units. This particularly increases flexibility and ease of use when grinding the rail. For example, different rail profiles or rail types and turnout areas can be ground. The two rail guide units each comprise a base body that is pivotable about its longitudinal axis on the machine frame.

[0026] A rail grinding machine according to claim 17 ensures a simple design and high ease of use. The two rail guide units each comprise, in particular, a base body that is pivotably mounted on the machine frame about a longitudinal axis. The two disc wheels and the guide roller are arranged on the respective base body. The two disc wheels are arranged at an angle to each other and are rotatable about associated axes. Preferably, the two rail guide units each comprise a guide hook. The guide hook is arranged, in particular, on the base body. The design of the two rail guide units ensures high flexibility and ease of use when grinding a rail.

[0027] The invention is further based on the objective of creating a method for grinding a rail of a track that enables a high level of user comfort.

[0028] This problem is solved by a method with the features of claim 18. The advantages of the method according to the invention correspond to the advantages already described for the rail grinding machine according to the invention. In particular, the method according to the invention can be further developed with any feature described in connection with the rail grinding machine according to the invention. Because the axis of rotation of the grinding unit is arranged at a distance from the guide plane, an improved view of the grinding tool and the grinding point on the rail is possible. This makes it possible, in particular, to profile the rail using the grinding tool by means of a top grinding and / or a side grinding with a high degree of user comfort.The grinding of the rail, in particular the profiling of the rail, is carried out by manually moving and tilting the rail grinding machine on the single rail to be ground using the handle. The height of the grinding unit relative to the machine frame is adjusted using the height adjustment device. The grinding tool is rotated around the axis of rotation by means of the tool holder and the drive motor.

[0029] Further features, advantages, and details of the invention will become apparent from the following description of several exemplary embodiments. These show: Fig. 1 a first perspective view of a rail grinding machine according to a first embodiment with a height adjustment device and a grinding unit arranged thereon, Fig. 2 a second perspective view of the rail grinding machine, Fig. 3 a side view of the rail grinding machine, Fig. 4 a front view of the rail grinding machine, Fig. 5 a first sectional view of the rail grinding machine along the section line VV in Fig. 3 Fig. 6 a top view of the rail grinding machine to illustrate unobstructed view areas, Fig. 7 a second sectional view along section line VII-VII in Fig. 6To illustrate the height adjustment device of the rail grinding machine without the grinding unit, Fig. 8 shows a perspective view of a rail grinding machine according to a second embodiment, Fig. 9 shows a perspective view of a rail grinding machine according to a third embodiment, and Fig. 10 shows a top view of the rail grinding machine. Fig. 9 .

[0030] The following is based on the Figs. 1 to 7 A first embodiment of the invention is described. The rail grinding machine 1 shown in the figures is used for grinding a rail 2 of a track 5. The track 5 comprises, in the usual manner, rails 2, 3 which are fastened to sleepers 4. The track 5 is in Fig. 4 illustrated.

[0031] The rail grinding machine 1 comprises a machine frame 6, two rail guide units 7, 8 for guiding the rail grinding machine 1 on the rail 2, a grinding unit 9, a height adjustment device 10 for adjusting the height of the grinding unit 9 relative to the machine frame 6 and a handle 11 for manually repositioning the grinding unit 9 or the rail grinding machine 1.

[0032] The first rail guide unit 7 and the second rail guide unit 8 are arranged at a longitudinal distance x from each other on the machine frame 6. In a machining position in which the rail grinding machine 1 is arranged on the rail 2, the longitudinal direction x runs essentially parallel to a longitudinal direction of the rail 2. The first rail guide unit 7 and the second rail guide unit 8 are pivotable about a longitudinal axis 12 relative to the machine frame 6.

[0033] The rail guide units 7, 8 each comprise a base body 13, which is pivotably mounted on the machine frame 6 about the longitudinal axis 12. Furthermore, the rail guide units 7, 8 each comprise two disc wheels 14, 15, a guide roller 16, and a guide hook 17. The disc wheels 14, 15 are arranged at an angle to each other and are rotatable about associated axes 18, 19. The rail guide units 7, 8 can be positioned against the rail 2 in various pivoted positions in the usual manner to perform a grinding operation.

[0034] The machine frame 6 is designed as a machine frame. The machine frame 6 comprises a lower longitudinal beam 20, an upper longitudinal beam 21, a first side beam 22, and a second side beam 24. The first side beam 22 and the second side beam 23 are spaced apart from each other in the longitudinal direction x and connect the lower longitudinal beam 20 to the upper longitudinal beam 21. The lower longitudinal beam 20 has a curved shape and extends from the rail guide units 7, 8 in a transverse direction y away from the longitudinal axis 12. The transverse direction y is perpendicular to the longitudinal direction x. The side beams 22, 23, and the upper longitudinal beam 21 together form a U-shape and are arranged relative to the rail guide units 7, 8 such that the upper longitudinal beam 21 extends away from the longitudinal axis 12 in the transverse direction y, corresponding to the lower longitudinal beam 20.

[0035] The height adjustment device 10 is attached to the machine frame 6. The height adjustment device 10 comprises a guide 24, a slide 25, a spindle drive carrier 26, a spindle drive 27, and a damping element 39. The guide 24 is a linear guide. The guide 24 serves to adjust the height of the grinding unit 9 in an adjustment direction z. The adjustment direction z is perpendicular to the longitudinal direction x and the transverse direction y.

[0036] The guide 24 comprises a first guide unit 28 and a second guide unit 29. The guide units 28 and 29 are spaced apart from each other in the longitudinal direction x and are each attached to the lower longitudinal beam 20 and to the spindle drive carrier 26, which in turn is attached to the upper longitudinal beam 21. The first guide unit 28 comprises a first guide element 30 on which a first guide sleeve 31 is slidably guided. Similarly, the second guide unit comprises a second guide element 32 on which a second guide sleeve 33 is slidably guided. The guide elements 30 and 32 are designed as guide rods. The guide elements 30 and 32 are attached to the lower longitudinal beam 20 and, via the spindle drive carrier 26, to the upper longitudinal beam 21. The guide elements 30 and 32 run parallel to each other in the adjustment direction z.The guide sleeves 31, 33 are accordingly displaceable between the lower longitudinal beam 20 and the upper longitudinal beam 21 in the adjustment direction z. The guide elements 30, 32 and the associated guide sleeves 31, 33 have, for example, a circular cross-section.

[0037] The first guide unit 28 has a first central longitudinal axis M1. Correspondingly, the second guide unit 29 has a second central longitudinal axis M2. The central longitudinal axes M1 and M2 run parallel to each other in the adjustment direction z. The central longitudinal axes M1 and M2 define a guide plane E of the guide 24. The longitudinal direction x and the adjustment direction z run parallel to the guide plane E. The transverse direction y runs perpendicular to the guide plane E and forms a normal vector.

[0038] The slide 25 is attached to the guide sleeves 31, 33 and is displaceable together with them in the adjustment direction z. The slide 25 has a first slide section 34 and a second slide section 35, which extends essentially transversely to the first slide section 34. The first slide section 34 extends essentially in the longitudinal direction x and the adjustment direction z. In contrast, the second slide section 35 extends essentially in the longitudinal direction x and the transverse direction y. The spindle drive carrier 26 runs essentially parallel to the second slide section 35. The spindle drive carrier 26 is attached to the upper longitudinal beam 21. The spindle drive carrier 26 extends essentially in the longitudinal direction x and the transverse direction y.

[0039] The grinding unit 9 is attached to the height adjustment device 10 and can be moved in the adjustment direction z by means of the height adjustment device 10. The grinding unit 9 is attached to the first slide section 34.

[0040] The spindle drive 27 serves to reposition the grinding unit 9 in the adjustment direction z. The spindle drive 27 comprises a spindle nut 36, a spindle 37, and a handwheel 38. The spindle drive carrier 26 has a through-hole 40. The spindle nut 36 is attached to the spindle drive carrier 26 concentrically with the through-hole 40. The through-hole of the spindle nut 36 has a diameter that is at most as large as the diameter of the through-hole 40. The spindle 37 is screwed into the spindle nut 36 and extends through the spindle nut 36 and the through-hole 40. A first end 41 of the spindle 37 is rotatably connected to the damping element 39. The damping element 39 is fixedly connected to the second slide section 35. The handwheel 38 is attached to a second end 42 of the spindle 37.By rotating the spindle 37 about a spindle axis 43 using the handwheel 38, the slide 25 and the grinding unit 9 attached to it can be lowered in the adjustment direction z or – in the reverse direction of rotation – raised against the adjustment direction z. The damping element 39 serves to dampen the vibrations of the spindle drive 27. In particular, the damping element 39 serves to decouple the grinding unit 9 and the spindle drive 27 from vibrations.

[0041] The grinding unit 9 comprises a drive motor 44, a fuel tank 45, a coupling 46, and a tool holder 47. The drive motor 44 is only present in the Figure 1 , 3 , 4 and 5The drive motor 44 is designed as an internal combustion engine and is supplied with fuel via the fuel tank 45. The drive motor 44 is connected to the coupling 46, which in turn is connected to the tool holder 47. The tool holder 47 can be rotated about a rotary axis 48 by means of the drive motor 44. A grinding tool 49 is held in or attached to the tool holder 47. The grinding tool 49, together with the tool holder 47, can be rotated about the rotary axis 48. The tool holder 47 does not intersect the guide plane E. The tool holder 47 is, for example, a flange to which the grinding tool 49 is attached or screwed. The grinding tool 49 is, for example, a grinding wheel.The coupling 46 serves to decouple the drive motor 44 and the tool holder 47 with regard to axially acting force peaks and / or force peaks acting around the axis of rotation 48, so that force peaks are dampened.

[0042] The axis of rotation 48 is arranged at a distance in the transverse direction y from the guide plane E. The axis of rotation 48 is particularly at a distance in the transverse direction y from the guide plane E in the area of ​​the tool holder 47 and the grinding tool 49. This is, for example, Fig. 5 Illustrated. The axis of rotation 48 is arranged on the same side of the guide plane E as the longitudinal axis 12. For a distance A of the axis of rotation 48 from the guide plane E in the transverse direction y, the following applies in particular: 1 cm < A ≤ 40 cm, in particular 3 cm ≤ A ≤ 30 cm, in particular 4 cm ≤ A ≤ 20 cm, and in particular 5 cm ≤ A ≤ 10 cm.

[0043] The spindle axis 43 is arranged in the transverse direction y between the guide plane E and the axis of rotation 48. The spindle axis 43 is thus spaced apart in the transverse direction y from both the guide plane E and the axis of rotation 48. The spindle axis 43 is located on the same side of the guide plane E as the axis of rotation 48. The spindle axis 43 has a distance B from the guide plane E in the transverse direction y, where the following holds true for the distance B: 1 cm ≤ B < 40 cm, in particular 3 cm ≤ B ≤ 30 cm, in particular 4 cm ≤ B ≤ 20 cm, and in particular 5 cm ≤ B ≤ 10 cm. In particular, B < A.

[0044] The handle 11 is used for manually moving the rail grinding machine 1 along the rail 2 and / or for manually tilting the rail grinding machine 1 about the rail 2. By moving the rail grinding machine 1 using the handle 11, the grinding unit 9 for grinding the rail 2 is also manually moved. The handle 11 is located on the same side of the guide plane E as the spindle axis 43 and the rotary axis 48. Viewed in the transverse direction y, the spindle axis 43 and the rotary axis 48 are located between the guide plane E and the handle 11. The spindle axis 43 and the rotary axis 48 are thus located on the side of the guide plane E facing the handle 11. The grinding unit 9 is located in a space between the guide plane E and the handle 11.

[0045] The handle 11 is U-shaped. It comprises a lower longitudinal bar 50, an upper longitudinal bar 51, a first side bar 52, and a second side bar 53. The first side bar 52 and the second side bar 53 are spaced apart from each other in the longitudinal direction x and connect the lower longitudinal bar 50 to the upper longitudinal bar 51. The upper longitudinal bar 51 essentially serves as a handle for an operator.

[0046] The handle 11 is attached to the rail guide units 7, 8 and can be pivoted together with them about the longitudinal axis 12. Additionally, the handle 11 can be adjusted relative to the rail guide units 7, 8 by pivoting and locked in the set pivot position. A foldable stand 54 for parking the rail grinding machine 1 is attached to the lower longitudinal rod 50.

[0047] The operation of the rail grinding machine 1 is as follows: The rail grinding machine 1 is first positioned on the rail 2 to be ground using the rail guide units 7, 8. The rail guide units 7, 8 are set and locked in a desired pivot position about the longitudinal axis 12. The grinding tool 49 is rotated about the axis of rotation 48 by means of the drive motor 44. An operator holds the rail grinding machine 1 by the handle 11.

[0048] The grinding tool 49 can be moved in the adjustment direction z by the operator using the handwheel 38 and positioned towards the rail 2. In the position of the rail grinding machine 1 shown in the figures, a head grinding is performed on a rail end 2' of the rail 2. For the head grinding, the operator can manually move the rail grinding machine 1 along the rail 2 using the handle 11.

[0049] Because the axis of rotation 48 is spaced from the guide plane E in the transverse direction y in the area of ​​the tool holder 47, the rail grinding machine 1 forms unobstructed viewing areas S1 and S2, which, viewed in the longitudinal direction x, are arranged between the rail guide unit 7 and the grinding tool 49 and between the second rail guide unit 8 and the grinding tool 49, respectively. The unobstructed viewing areas S1 and S2 are particularly evident in the top view according to Fig. 6to be recognized. The unobstructed view areas S1 and S2 provide the operator with a clear view of the rail 2 and the rail head 2' to be ground, respectively. These unobstructed view areas S1 and S2 are created when the operator tilts the rail grinding machine 1 around the rail 2 towards the machine frame 6 to perform side grinding of the rail head 2'. During the grinding process, the spindle drive 27 for adjusting the height of the grinding unit 9 is vibration-damped by means of the damping element 39.

[0050] The following is based on the Figure 8A second embodiment of the invention is described. In contrast to the first embodiment, the first guide unit 28 additionally comprises a lower damping element 55 and an upper damping element 56. The first guide element 30 is attached to the lower longitudinal beam 20 by means of the lower damping element 55 and to the spindle drive carrier 26 or the upper longitudinal beam 21 by means of the upper damping element 56. Similarly, the second guide unit 29 comprises a lower damping element 57 and an upper damping element 58. The second guide element 32 is attached to the lower longitudinal beam 20 by means of the lower damping element 57 and to the spindle drive carrier 26 or the upper longitudinal beam 21 by means of the upper damping element 58. The damping elements 55 to 58 serve to decouple the grinding unit 9 and the handle 11 from vibration.Vibrations acting on the guide 24 from the grinding unit 9 during the grinding process are damped by means of the damping elements 55 to 58, so that the vibrations acting on the machine frame 6 and the handle 11 are reduced.

[0051] The lower damping elements 55, 57 each have a first spring stiffness, whereas the upper damping elements 56, 58 each have a second spring stiffness. The first spring stiffness differs from the second spring stiffness. In particular, the first spring stiffness is greater than the second spring stiffness. This prevents undesirable oscillation of the height adjustment device 10 or the grinding unit 9 attached to it. For further details regarding the construction and operation, reference is made to the description of the preceding embodiment.

[0052] The following is based on the Figure 9 and 10A third embodiment of the invention is described. In contrast to the preceding embodiments, the spindle axis 43 and the rotary axis 48 are arranged on one side of the guide plane E that faces away from the handle 11. The spindle axis 43 and the rotary axis 48 are arranged on a first side of the guide plane E, whereas the handle 11 is arranged on a second side of the guide plane E. Compared to the preceding embodiments, the handle 11 is thus arranged on the opposite side of the guide plane E. The grinding unit 9 is therefore not arranged in a gap between the machine frame 6 and the handle 11. This also results in unobstructed views S1 and S2 of the rail head 2' of the rail 2 to be ground. The drive motor 44 is located in the Figure 9 and 10Not illustrated. For further details regarding the construction and operation of the rail grinding machine 1, please refer to the description of the preceding exemplary embodiments.

[0053] In general, the individual features of the exemplary embodiments can be combined in any way.

Claims

1. Rail grinding machine for grinding a rail of a track, in particular by manually moving and manually tilting the rail grinding machine, comprising: - a machine frame (6), - two rail guide units (7, 8) for guiding the rail grinding machine (1) on exactly one rail (2), -- wherein the rail guide units (7, 8) are spaced apart from each other in a longitudinal direction (x), and -- wherein the rail guide units (7, 8) are arranged on the machine frame (6), - a grinding unit (9) comprising a drive motor (44) and a tool holder (47) for rotating a grinding tool (49) about a rotary axis (48), - a height adjustment device (10) for adjusting the height of the grinding unit (9) relative to the machine frame (6), - a handle (11) for manually moving the grinding unit (9), characterized by that a guide (24) of the height adjustment device (10) defines a guide level (E) and that the axis of rotation (48), in particular in the area of ​​the tool holder (47), is arranged at a distance from the guide plane (E).

2. Rail grinding machine according to claim 1, characterized by that For a distance A of the axis of rotation (48) from the guide plane (E) the following applies: 1 cm < A ≤ 40 cm, in particular 3 cm ≤ A ≤ 30 cm, in particular 4 cm ≤ A ≤ 20 cm, and in particular 5 cm ≤ A ≤ 10 cm.

3. Rail grinding machine according to claim 1 or 2, characterized by that the machine frame (6) comprises a lower longitudinal beam (20) and an upper longitudinal beam (21), and that the guide (24) is attached to the lower longitudinal beam (20) and the upper longitudinal beam (21).

4. Rail grinding machine according to at least one of the preceding claims, characterized by that the guide (24) comprises at least one guide unit (28, 29) for relocating the grinding unit (9) in an adjustment direction (z).

5. Rail grinding machine according to claim 4, characterized by that which comprises at least one guide unit (28, 29), one guide element (30, 32) and at least one damping element (55, 56, 57, 58).

6. Rail grinding machine according to claim 4 or 5, characterized by that which comprises at least one guide unit (28, 29) each comprising a guide element (30, 32), a lower damping element (55, 57) and an upper damping element (56, 58).

7. Rail grinding machine according to claim 6, characterized by that the lower damping element (55, 57) and the upper damping element (56, 58) have different spring stiffnesses.

8. Rail grinding machine according to at least one of the preceding claims, characterized by that the height adjustment device (10) comprises a slide (25) which is slidably mounted on the guide (24) in an adjustment direction (z).

9. Rail grinding machine Claim 8, characterized by the fact that a spindle drive (27) of the height adjustment device (10) and / or the grinding unit (9) is attached to the carriage (25).

10. Rail grinding machine according to at least one of the preceding claims, characterized by that the height adjustment device (10) comprises a spindle drive (27) with a spindle axis (43) which is spaced apart from the guide plane (E) and / or from the rotary axis (48), in particular in the area of ​​the tool holder (47).

11. Rail grinding machine according to claim 10, characterized by that the spindle axis (43) is arranged between the guide plane (E) and the rotary axis (48).

12. Rail grinding machine according to claim 10 or 11, characterized by that the spindle drive (27) is arranged on an upper longitudinal beam (21) of the machine frame (6).

13. Rail grinding machine according to at least one of claims 10 to 12, characterized by that the height adjustment device (10) includes at least one damping element (39) for vibration damping of the spindle drive (27).

14. Rail grinding machine according to at least one of the preceding claims, characterized by that the axis of rotation (48) and / or a spindle axis (43) of a spindle drive (27) is arranged on a side of the guide plane (E) which faces the handle (11).

15. Rail grinding machine according to at least one of claims 1 to 13, characterized by that the axis of rotation (48) and / or a spindle axis (43) of a spindle drive (27) is arranged on a side of the guide plane (E) that is facing away from the handle (11).

16. Rail grinding machine according to at least one of the preceding claims, characterized by thatthe two rail guide units (7, 8) can be pivoted relative to the machine frame (6) about a longitudinal axis (12).

17. Rail grinding machine according to at least one of the preceding claims, characterized by that the two rail guide units (7, 8) each comprise two disc discs (14, 15) and a guide roller (16).

18. Method for grinding a rail of a track, comprising the steps of: - providing a rail grinding machine (1) according to at least one of the preceding claims, - positioning the rail grinding machine (1) with the two rail guide units (7, 8) on the rail (2) to be ground, and - manually repositioning the grinding unit (9) by means of the handle (11), in particular by manually moving and manually tilting the rail grinding machine (1) by means of the handle (11).

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