Rail grinding machine and method for grinding track rails

Abstract

We will create a rail grinding machine for grinding track rails, which has a simple design and is very convenient to use. [Solution] The rail grinding machine (1) comprises a machine frame (6), a rail guide unit positioned on the machine frame (6), a grinding unit (9) having a drive motor (44) and a tool holder (47) for rotating around a rotation axis (48) to drive a grinding tool (49), a height adjustment device (10) for adjusting the height of the grinding unit (9), and a handle (11) for manually moving the grinding unit (9). The guide (24) of the height adjustment device (10) defines a guide plane (E). The rotation axis (48) is spaced away from the guide plane (E), particularly in the area of ​​the tool holder (47). As a result, the rail grinding machine (1) has a simple design and is convenient to use. In particular, the rail grinding machine (1) allows for an unrestricted field of view of the grinding point.

Description

Technical Field

[0001] The content of German Patent Application 102024209981.3 is incorporated herein by reference.

Background Art

[0002] The present invention relates to a rail grinding machine and method for grinding rails of a track. The rail grinding machine can be manually moved and tilted, particularly by a handle. In particular, the rail grinding machine is designed to be manually moved and manually tilted precisely on exactly one rail.

[0003] German Patent Application Publication No. 1274610 (corresponding to US Patent No. 3427758) discloses a rail grinding machine for grinding rails of a track. The rail grinding machine can be manually moved precisely on exactly one rail. The rail grinding machine includes a chassis frame on which rollers are arranged. A machine framework is attached to the chassis frame between the rollers. Frame components are attached to the machine framework, which can be adjusted in height with respect to the machine framework and the chassis frame by a spindle drive. A grinding device equipped with a drive motor is attached to the frame components. In order to grind the rail, the grinding wheel carriage can be rotationally driven about the axis of rotation by the drive motor. In order to profile the rail, the machine framework on which the grinding device is arranged is pivoted with respect to the chassis frame.

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to create a rail grinding machine for grinding rails of a track that has a simple design and is very convenient to use.

Means for Solving the Problems

[0005] This objective is achieved by a rail grinder having the features of claim 1. The rail grinder can be moved, in particular on the rail, and / or tilted on the rail by a handle. This makes it possible to profile the rail using a grinding tool, in particular by head grinding and / or side grinding. A height adjustment device is positioned on the machine frame. The grinding unit is positioned on the height adjustment device for height adjustment relative to the machine frame. The fact that the rotation axis of the grinding unit is spaced away from the guide plane allows for an improved view of the grinding tool and the grinding point on the rail. The rotation axis is spaced away from the guide plane, in particular in the area of ​​the tool holder, so that during the operation of the rail grinder, the contact area between the grinding tool held in the tool holder and the rail being ground is spaced away from the guide plane. The rotation axis extends substantially parallel to the guide plane, in particular. The rotation axis is spaced laterally from the guide plane, in particular. The lateral direction forms a normal vector with respect to the guide plane.

[0006] The guide plane is defined or spanned by the guide. If the guide comprises, for example, two guide units, the guide plane is defined by the central longitudinal axis of the guide units. The guide plane extends particularly parallel to the longitudinal direction. If the rail grinder is positioned on a rail, the guide plane and / or longitudinal direction extends particularly substantially parallel to the rail or the longitudinal direction of the rail. The guide is preferably a linear guide. The adjustment direction of the guide extends particularly perpendicular to the longitudinal direction and / or perpendicular to the transverse direction.

[0007] The rail grinder is designed specifically for manual movement and / or manual inclination on exactly one rail of the track. For this purpose, the rail grinder has exactly two rail guide units for guiding the rail grinder on exactly one rail. The exactly two rail guide units are positioned on the machine frame at a distance from each other in the longitudinal direction. Thus, the machine frame is positioned longitudinally between exactly the two rail guide units. The longitudinal direction corresponds to the longitudinal rail direction when the rail grinder is positioned on exactly one rail. In particular, the rail grinder does not have rail guide units for guiding the rail grinder on any additional adjacent rails. Since the entire rail grinder is inclined, especially for grinding the rail to contour the rail, the grinding unit cannot pivot relative to the machine frame. Thus, the grinding unit can only be displaced linearly relative to the machine frame using a height adjustment device.

[0008] The height adjustment device and / or grinding unit are preferably positioned between the rail guide units in the longitudinal direction. The rail guide units define the longitudinal axis. The guide plane is spaced laterally away from the longitudinal axis of the rail guide units. The grinding unit is positioned in particular on the side of the guide plane facing the longitudinal axis. The rail guide units are preferably pivotable relative to the machine frame about the longitudinal axis. The handle can pivot in particular with the rail guide unit about the longitudinal axis. For this purpose, the handle is attached to the rail guide unit in a manner that is, for example, fixed or lockable. The handle can pivot and lock relative to the rail guide unit. The handle is particularly arched. The handle is spaced laterally away from the guide plane.

[0009] The height adjustment device includes, in particular, a spindle drive unit for adjusting the height of the grinding unit. The spindle drive unit includes a spindle axis. The spindle axis may be located within the guide plane or spaced away from the guide plane. Preferably, the spindle axis is spaced away from the guide plane in the area of ​​the tool holder. The spindle axis can be spaced away from the rotation axis. The spindle axis can be positioned such that the spindle axis is located between the guide plane and the rotation axis in the area of ​​the tool holder, or the rotation axis is located between the guide plane and the spindle axis in the area of ​​the tool holder, or the guide plane is located between the spindle axis and the rotation axis in the area of ​​the tool holder.

[0010] The drive motor is used to rotate the tool holder around its axis of rotation. During the operation of the rail grinding machine, the grinding tool is either inside or mounted on the tool holder. The grinding tool can be rotated by the drive motor through the tool holder around its axis of rotation. The tool holder is designed, for example, as a flange to which the grinding tool is mounted or screwed. To grind the rail, the grinding unit and grinding tool, which are thereby rotated, can be moved and / or tilted relative to the rail being ground by a handle. Due to the fact that the axis of rotation of the tool holder is spaced away from the guide plane, the guide does not obstruct the view of the rail head and grinding tool, and as a result, the operator's view of the rail head and grinding tool is not restricted. The design for spaced the axis of rotation away from the guide plane is simple. Therefore, the rail grinding machine has a simple design and is very convenient to use.

[0011] The rail grinding machine described in claim 2 ensures a simple design and convenient use. The distance A of the rotation axis from the lateral guide plane ensures that the operator can see the rail head and grinding tool without restriction. The rotation axis is spaced at a distance A from the guide plane, particularly in the area of ​​the tool holder. The distance A is substantially constant but may vary slightly depending on the angular position of the rotation axis. The distance A of the rotation axis from the guide plane is preferably within the claimed range in the entire area of ​​the tool holder. The grinding unit comprises a drive motor and a tool holder which can be rotationally driven by the drive motor. The grinding tool is preferably held or mounted in or on the tool holder. The grinding tool is designed, for example, as a grinding wheel. The drive motor and / or the tool holder and / or the grinding tool preferably do not intersect the guide plane. For this purpose, the distance A is selected specifically accordingly.

[0012] The rail grinding machine described in claim 3 ensures a simple design and extremely convenient use. The machine frame is specifically designed as a machine framework. For this purpose, the machine frame comprises a lower longitudinal member and an upper longitudinal member, as well as a first side member and a second side member. The side members connect the lower longitudinal member and the upper longitudinal member to the machine framework. Guides are mounted between the side members, between the lower longitudinal member and the upper longitudinal member, as viewed from the longitudinal direction. The guides are directly and / or indirectly mounted to the lower longitudinal member and / or the upper longitudinal member. For example, the guides are indirectly mounted to the upper longitudinal member via a spindle drive support. The guides are specifically linear guides. The guides particularly comprise at least two guide units mounted to the lower longitudinal member and the upper longitudinal member, spaced apart from each other in the longitudinal direction. The guide units are directly and / or indirectly mounted. Thus, the guide units are positioned between the side members. The lower longitudinal member and / or upper longitudinal member have a curved shape. The curved shape extends away from the axis of rotation, particularly laterally. Preferably, the lower longitudinal member extends from the rail guide unit in a curved shape away from the axis of rotation. The side members and / or upper longitudinal members extend in a curved shape to move away from the axis of rotation accordingly.

[0013] The rail grinding machine described in claim 4 ensures a simple design and extremely convenient use. At least one guide unit defines the guide plane and adjustment direction. The adjustment direction extends in particular parallel to the guide plane. The adjustment direction preferably extends perpendicular to the longitudinal and / or transverse directions. At least one guide unit is used in particular as a linear guide. At least one guide unit is positioned on the machine frame, in particular the lower longitudinal member and the upper longitudinal member. At least one guide unit is positioned in particular between two side members that connect the lower longitudinal member and the upper longitudinal member to each other. At least one guide unit is attached directly and / or indirectly to the lower longitudinal member and / or the upper longitudinal member. The guide preferably comprises at least two guide units positioned on the machine frame spaced apart from each other when viewed in the longitudinal direction. At least two guide units preferably extend parallel to each other and define the guide plane and adjustment direction. For example, the longitudinal axes of at least two guide units define the guide plane.

[0014] The rail grinding machine described in claim 5 ensures a simple design and convenient use. A guide is used to adjust the height of the grinding unit. For this purpose, the grinding unit is positioned on the guide. At least one damping element is used to dampen and / or isolate vibrations of the handle. Vibrations caused by grinding and the drive motor and transmitted from the grinding unit to the guide are damped by at least one damping element and thus at least partially isolated from the handle. At least one damping element is positioned between the guide element and the machine frame. At least one damping element is preferably positioned between the guide element and the lower longitudinal member and / or between the guide element and the upper longitudinal member. The guide element is designed, for example, as a guide bar. The guide bar has, for example, a circular, elliptical, or polygonal cross-section. The guide bar may be hollow.

[0015] The rail grinding machine described in claim 6 ensures a simple design and convenient use. Each guide element is positioned between a lower damping element and an upper damping element. The lower and upper damping elements are positioned on the machine frame. The lower damping element is preferably positioned on a lower longitudinal member, and the upper damping element is positioned on an upper longitudinal member. The lower and / or upper damping elements are directly and / or indirectly attached to the lower and / or upper longitudinal members. The lower and upper damping elements enable improved vibration damping and / or vibration isolation of the handle.

[0016] The rail grinding machine described in claim 7 ensures a simple design and convenient use. The damping elements, with their different spring stiffnesses, prevent undesirable vibrations of the grinding unit. At least one guide unit functions as both a fixed and a floating bearing, with different spring stiffnesses. Preferably, the spring stiffness of the lower damping element is greater than that of the upper damping element.

[0017] The rail grinding machine according to claim 8 ensures a simple design and convenient use. The carriage allows for easy mounting of the grinding unit to the guide and / or simple height adjustment of the grinding unit by the spindle drive. The carriage comprises, in particular, at least one first carriage section to which the grinding unit is mounted and one second carriage section to which the spindle drive is mounted. The second carriage section extends laterally in particular with respect to the first carriage section. The spindle drive is positioned in particular between the carriage, in particular the second carriage section and the machine frame, in particular the upper longitudinal member.

[0018] The rail grinding machine described in claim 9 ensures a simple design and convenient use. The grinding unit and the spindle drive unit are preferably mounted on a carriage. The grinding unit is mounted in particular on a first carriage section, and the spindle drive unit is mounted on a second carriage section. The second carriage section extends laterally with respect to the first carriage section in particular. The spindle drive unit is preferably mounted between the carriage, in particular on the second carriage section, and the machine frame, in particular on the upper longitudinal member. Thanks to the fact that the grinding unit and the spindle drive unit are mounted on the carriage independently of each other, the operator can see the grinding unit, in particular the grinding tool and the associated grinding point, without limitation.

[0019] The rail grinding machine described in claim 10 ensures a simple design and convenient use. The spindle drive unit can be spaced apart from the machine frame as a result of the fact that the spindle axis is spaced apart from the guide plane when viewed laterally. This simplifies the design. The height adjustment device preferably includes a spindle drive support, which is mounted on the machine frame, particularly the upper longitudinal member, and the spindle drive unit is mounted on the spindle drive support. The spindle nut of the spindle drive unit is preferably mounted on the spindle drive support, while the spindle of the spindle drive unit is rotatably mounted on the carriage. The spindle drive unit is particularly equipped with a handwheel for manual operation. The spindle axis is preferably spaced apart from the axis of rotation laterally, particularly in the area of ​​the tool holder. This avoids obstruction of the view of the rail head and grinding tool.

[0020] The rail grinding machine according to claim 11 ensures a simple design and convenient use. The spindle drive unit can be easily attached to the machine frame, and due to the fact that the spindle axis passes between the guide plane and the rotation axis when viewed in the lateral direction, a substantially unobstructed view of the rail head and the grinding tool is enabled. The spindle axis passes between the guide plane and the rotation axis, particularly in the area of the tool holder. The spindle axis extends parallel to the guide plane and / or the rotation axis, particularly. The spindle axis is preferably at a distance B from the guide plane in the lateral direction, where 1 cm ≤ B < 40 cm, particularly 3 cm ≤ B ≤ 30 cm, particularly 4 cm ≤ B ≤ 20 cm, particularly 5 cm ≤ B ≤ 10 cm. In particular, B < A. The spindle axis is preferably at a distance B from the guide plane within the area of the tool holder.

[0021] The rail grinding machine according to claim 12 ensures a simple design and convenient use. The machine frame preferably forms a machine frame framework comprising a lower longitudinal member, an upper longitudinal member, and side members. The side members connect the lower longitudinal member to the upper longitudinal member. The spindle drive unit can be attached directly or indirectly to the upper longitudinal member. For example, the spindle drive unit can be attached to the upper longitudinal member via a spindle drive support. By arranging the spindle drive unit on the upper longitudinal member, it becomes easily possible to accurately guide the grinding unit. The height adjustment device preferably comprises a spindle drive support attached to the upper longitudinal member. While the spindle nut of the spindle drive unit is attached to the spindle drive support, the spindle of the spindle drive unit is rotatably attached to the carriage. The spindle drive unit particularly comprises an operating handwheel.

[0022] The rail grinding machine according to claim 13 ensures a simple design and convenient use. At least one damping element is used, in particular, for vibration damping and / or vibration isolation of the handwheel of the spindle drive unit. At least one damping element is positioned, for example, between the carriage and the spindle drive unit and / or between the spindle and the handwheel.

[0023] The rail grinding machine described in claim 14 ensures a simple design and convenient use. The grinding unit is positioned in the intermediate space between the guide plane and the handle, due to the fact that the axis of rotation is positioned on the side of the guide plane facing the handle, particularly in the area of ​​the tool holder. As a result, the rail grinding machine can be easily and conveniently moved and / or tilted by the operator by the handle, and at the same time, simple height adjustment of the rail head and grinding point and an unrestricted field of view are possible.

[0024] The rail grinding machine described in claim 15 ensures a simple design and convenient use. The rail head and grinding point, which are not particularly limited in their field of view, are made possible by the fact that the axis of rotation, and possibly the spindle axis, in particular in the area of ​​the tool holder, and possibly the spindle axis as well, are positioned on the side of the guide plane facing outward from the handle.

[0025] The rail grinding machine described in claim 16 ensures a simple design and high operational comfort. Exactly two rail guide units are positioned on the machine frame at a distance from each other in the longitudinal direction. The longitudinal direction extends essentially parallel to the longitudinal direction of the rail to be ground. Exactly two rail guide units can pivot about the longitudinal axis relative to the machine frame, so that different processing positions of the exact two rail guide units can be set. This enhances flexibility and operational comfort, especially when grinding rails. For example, different rail profiles or rail types and switch areas can be ground. Each of the exact two rail guide units comprises a base body positioned on the machine frame so that it can pivot about the longitudinal axis.

[0026] The rail grinding machine according to claim 17 ensures a simple design and high operating comfort. Exactly two rail guide units each comprise a base body arranged on the machine frame such that it is pivotable, in particular, about the longitudinal axis. Two dish-shaped disks and guide rollers are arranged on the respective base body. The two dish-shaped disks are arranged, in particular, at an angle to each other and are rotatable about the associated axis. Preferably, exactly two rail guide units each comprise a guide hook. The guide hook is arranged, in particular, on the base body. The design of exactly two rail guide units ensures high flexibility and high operating comfort when grinding the rail.

[0027] The present invention is further based on the object of creating a method for grinding the rails of a track that enables a high level of operating comfort.

[0028] This object is achieved by a method having the features of claim 18. The advantages of the method according to the invention correspond to the already described advantages of the rail grinding machine according to the invention. In particular, the method according to the invention can be further developed using any of the features described in connection with the rail grinding machine according to the invention. Since the rotational axis of the grinding unit is arranged away from the guide plane, an improved view of the grinding tool and the grinding point on the rail is possible. This enables, in particular, the contouring of the rail using a grinding tool with head grinding and / or side grinding having a high level of operating comfort. The grinding of the rail, in particular the contouring of the rail, is performed by manually moving the rail grinding machine and manually tilting it on exactly one rail that is being ground using a handle. The height adjustment of the grinding unit relative to the machine frame is performed by a height adjustment device. The grinding tool is rotated about the rotational axis by a tool holder and a drive motor.

[0029] Further features, advantages and details of the present invention result from the following description of a plurality of exemplary embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] [Figure 1] This is a first perspective view of a rail grinding machine according to a first typical embodiment, in which a height adjustment device and a grinding unit are arranged. [Figure 2] This is a second perspective view of the rail grinding machine. [Figure 3] This is a side view of a rail grinding machine. [Figure 4] This is a front view of a rail grinding machine. [Figure 5] This is the first cross-sectional view of the rail grinding machine along the cutting line VV in Figure 3. [Figure 6] This is a top view of a rail grinding machine to show a clear field of view. [Figure 7] This is a second cross-sectional view along the cutting line VII-VII in Figure 6, showing the height adjustment device of a rail grinding machine without a grinding unit. [Figure 8] This is a perspective view of a rail grinding machine according to a second typical embodiment. [Figure 9] This is a perspective view of a rail grinding machine according to a third typical embodiment. [Figure 10] Figure 9 is a top view of the rail grinding machine. [Modes for carrying out the invention]

[0031] A typical first embodiment of the present invention will be described below with reference to Figures 1 to 7. The illustrated rail grinding machine 1 is used to grind the rails 2 of the track 5. The track 5 is equipped with rails 2 and 3 in a conventional manner, and the rails 2 and 3 are attached to sleepers 4. The track 5 is shown in Figure 4.

[0032] The rail grinding machine 1 comprises a machine frame 6, two rail guide units 7 and 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 moving the grinding unit 9 or the rail grinding machine 1.

[0033] The first rail guide unit 7 and the second rail guide unit 8 are positioned on the machine frame 6 spaced apart from each other in the longitudinal direction x. At the working position where the rail grinding machine 1 is positioned on the rail 2, the longitudinal direction x extends substantially parallel to the longitudinal direction of the rail 2. The first rail guide unit 7 and the second rail guide unit 8 can pivot with respect to the machine frame 6 about the longitudinal axis 12.

[0034] Each rail guide unit 7 and 8 includes a base body 13 positioned on the machine frame 6 so as to pivot about the longitudinal axis 12. Furthermore, each rail guide unit 7 and 8 includes two disc-shaped discs 14 and 15, a guide roller 16, and a guide hook 17. The disc-shaped discs 14 and 15 are positioned at an angle to each other and can be rotated about their respective axes 18 and 19. The rail guide units 7 and 8 can be positioned relative to the rail 2 in various pivotal positions in a conventional manner to perform grinding operations.

[0035] The machine frame 6 is designed as a machine framework. The machine frame 6 comprises a lower longitudinal member 20, an upper longitudinal member 21, a first side member 22, and a second side member 24. The first side member 22 and the second side member 23 are spaced apart from each other in the longitudinal direction x and connect the lower longitudinal member 20 and the upper longitudinal member 21. The lower longitudinal member 20 has a curved shape and extends from the rail guide units 7 and 8 in the lateral direction y away from the longitudinal axis 12. The lateral direction y extends perpendicular to the longitudinal direction x. The side members 22 and 23 and the upper longitudinal member 21 together form a U-shape and are positioned relative to the rail guide units 7 and 8 such that the upper longitudinal member 21 extends in the lateral direction y, corresponding to the lower longitudinal member 20, away from the longitudinal axis 12.

[0036] The height adjustment device 10 is mounted on the machine frame 6. The height adjustment device 10 comprises a guide 24, a carriage 25, a spindle drive support 26, a spindle drive unit 27, and a damping element 39. The guide 24 is a linear guide. The guide 24 is used to adjust the height of the grinding unit 9 in the adjustment direction z. The adjustment direction z is perpendicular to the longitudinal direction x and the transverse direction y.

[0037] 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 attached to the lower longitudinal member 20 and the spindle drive support 26, respectively, and the spindle drive support 26 is attached to the upper longitudinal member 21. The first guide unit 28 comprises a first guide element 30 on which a first guide sleeve 31 is displaceably guided. Thus, the second guide unit comprises a second guide element 32 on which a second guide sleeve 33 is displaceably guided. The guide elements 30 and 32 are designed as guide bars. The guide elements 30 and 32 are attached to the lower longitudinal member 20 and to the upper longitudinal member 21 via the spindle drive support 26. The guide elements 30 and 32 extend parallel to each other in the adjustment direction z. Therefore, the guide sleeves 31 and 33 can be displaced between the lower longitudinal member 20 and the upper longitudinal member 21 in the adjustment direction z. The guide elements 30 and 32 and the associated guide sleeves 31 and 33 have, for example, a circular cross-section.

[0038] The first guide unit 28 has a first central longitudinal axis M1. Therefore, the second guide unit 29 has a second central longitudinal axis M2. The central longitudinal axes M1 and M2 extend parallel to each other in the adjustment direction z. The central longitudinal axes M1 and M2 define the guide plane E of the guide 24. The longitudinal direction x and the adjustment direction z extend parallel to the guide plane E. The transverse direction y extends perpendicular to the guide plane E and forms a normal vector.

[0039] The carriage 25 is attached to guide sleeves 31 and 33 and can move with them in the adjustment direction z. The carriage 25 has a first carriage section 34 and a second carriage section 35 that extends substantially laterally to the first carriage section 34. The first carriage section 34 extends substantially in the longitudinal direction x and the adjustment direction z. In contrast, the second carriage section 35 extends substantially in the longitudinal direction x and the lateral direction y. The spindle drive support 26 extends substantially parallel to the second carriage section 35. The spindle drive support 26 is attached to the upper longitudinal member 21. The spindle drive support 26 extends substantially in the longitudinal direction x and the lateral direction y.

[0040] The grinding unit 9 is attached to the height adjustment device 10 and is movable in the adjustment direction z by the height adjustment device 10. The grinding unit 9 is attached to the first carriage section 34.

[0041] The spindle drive unit 27 is used to move the grinding unit 9 in the adjustment direction z. The spindle drive unit 27 comprises a spindle nut 36, a spindle 37, and a handwheel 38. The spindle drive support unit 26 has a through opening 40. The spindle nut 36 is mounted on the spindle drive support unit 26 concentrically with the through opening 40. The through opening of the spindle nut 36 has a diameter that is at most the same as the diameter of the through opening 40. The spindle 37 is screwed onto the spindle nut 36 and passes through the spindle nut 36 and the through opening 40. The first end 41 of the spindle 37 is rotatably connected to a damping element 39. The damping element 39 is fixedly connected to a second carriage section 35. The handwheel 38 is mounted on the second end 42 of the spindle 37. The carriage 25 and the grinding unit 9 attached thereto can be lowered in the adjustment direction z by rotating the spindle 37 around the spindle axis 43 using the handwheel 38, or raised relative to the adjustment direction z when the direction of rotation is reversed. The damping element 39 is used to dampen vibrations of the spindle drive unit 27. The damping element 39 is used in particular to isolate vibrations between the grinding unit 9 and the spindle drive unit 27.

[0042] The grinding unit 9 includes a drive motor 44, a fuel tank 45, a clutch 46, and a tool holder 47. The drive motor 44 is shown only in FIGS. 1, 3, 4, and 5. The drive motor 44 is designed as an internal combustion engine and is supplied with fuel by the fuel tank 45. The drive motor 44 is connected to the clutch 46, and the clutch is connected to the tool holder 47. The tool holder 47 can rotate about the axis of rotation 48 by the drive motor 44 or is driven to rotate. The grinding tool 49 is held or mounted in or on the tool holder 47. The grinding tool 49 can be rotationally driven about the axis of rotation 48 together with the tool holder 47. The tool holder 47 does not intersect the guide plane E. The tool holder 47 is designed, for example, as a flange to which the grinding tool 49 is attached or screwed. The grinding tool 49 is, for example, a grinding wheel. The clutch 46 is used to disconnect the drive motor 44 and the tool holder 47 against the peak of the force acting in the axial direction and / or the peak of the force acting around the axis of rotation 48, and as a result, the peak of the force is attenuated.

[0043] The axis of rotation 48 is spaced apart from the guide plane E in the lateral direction y. The axis of rotation 48 is spaced apart from the guide plane E in the lateral direction y, particularly in the region of the tool holder 47 and the grinding tool 49. This is shown as an example in FIG. 5. The axis of rotation 48 is arranged on the same side as the longitudinal axis 12 of the guide plane E. The following applies particularly to the distance A of the axis of rotation 48 from the guide plane E in the lateral direction y: 1 cm <A ≦ 40 cm, particularly 3 cm ≦ A ≦ 30 cm, particularly 4 cm ≦ A ≦ 20 cm, particularly 5 cm ≦ A ≦ 10 cm.

[0044] The spindle axis 43 is positioned between the guide plane E and the rotation axis 48 when viewed in the lateral direction y. Therefore, the spindle axis 43 is spaced apart from the guide plane E and the rotation axis 48 in the lateral direction y. The spindle axis 43 is positioned on the same side as the rotation axis 48 on the guide plane E. The spindle axis 43 is at a distance B from the guide plane E in the lateral direction y, and the following applies to distance B in particular: 1cm ≤ B < 40cm, in particular 3cm ≤ B ≤ 30cm, in particular 4cm ≤ B ≤ 20cm, in particular 5cm ≤ B ≤ 10cm. In particular, B <Aである。

[0045] The handle 11 is used to manually move the rail grinder 1 along the rail 2 and / or to manually tilt the rail grinder around the rail 2. Moving the rail grinder 1 with the handle 11 also manually moves the grinding unit 9 for grinding the rail 2. The handle 11 is positioned on the same side of the guide plane E as the spindle axis 43 and the rotation axis 48. The spindle axis 43 and the rotation axis 48 are positioned between the guide plane E and the handle 11 when viewed in the lateral direction y. Thus, the spindle axis 43 and the rotation axis 48 are positioned on the side of the guide plane E facing the handle 11. The grinding unit 9 is positioned in the intermediate space between the guide plane E and the handle 11.

[0046] The handle 11 is arched. The handle 11 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 the lower longitudinal bar 50 is connected to the upper longitudinal bar 51. The upper longitudinal bar 51 is used substantially as a handle bar for the operator.

[0047] The handle 11 is attached to the rail guide units 7 and 8 and can pivot together with them around the longitudinal axis 12. Furthermore, the handle 11 can be adjusted relative to the rail guide units 7 and 8 by pivoting and can be locked in a set pivot position. A foldable stand 54 is attached to the lower longitudinal bar 50 for installing the rail grinding machine 1.

[0048] Rail grinding machine 1 operates as follows:

[0049] First, the rail grinding machine 1 is positioned on the rail 2, with the rail guide units 7 and 8 being used as the grinding targets. The rail guide units 7 and 8 are set and locked in the desired pivot position around the longitudinal axis 12. The grinding tool 49 is rotated by the drive motor 44 around the rotation axis 48. The operator grips the rail grinding machine 1 with the handle 11.

[0050] The grinding tool 49 can be moved by the operator in the adjustment direction z by the handwheel 38 and fed onto the rail 2. At the position of the rail grinder 1 shown in the figure, head grinding is performed on the rail head 2' of the rail 2. For head grinding, the operator can manually move the rail grinder 1 along the rail 2 by the handle 11.

[0051] Due to the fact that the rotation axis 48 is spaced apart from the guide plane E in the lateral direction y within the area of ​​the tool holder 47, the rail grinder 1 forms clear viewing areas S1 and S2 located between the rail guide unit 7 and the grinding tool 49 or between the second rail guide unit 8 and the grinding tool 49 when viewed in the longitudinal direction x. Clear viewing areas S1 and S2 are shown in particular in the top view according to Figure 6. Clear viewing areas S1 and S2 give the operator a clear view of the rail 2 or rail head 2' being ground. When the operator tilts the rail grinder 1 in the direction of the machine frame 6 around the rail 2 to perform side grinding of the rail head 2', corresponding clear viewing areas S1 and S2 are created. During grinding, the spindle drive unit 27 for adjusting the height of the grinding unit 9 is vibration-damped by a damping element 39.

[0052] A second typical embodiment of the present invention is described below with reference to Figure 8. Unlike the first typical embodiment, the first guide unit 28 further comprises a lower damping element 55 and an upper damping element 56. The first guide element 30 is attached to the lower longitudinal member 20 by the lower damping element 55 and to the spindle drive support 26 or the upper longitudinal member 21 by the upper damping element 56. Thus, 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 member 20 by the lower damping element 57 and to the spindle drive support 26 or the upper longitudinal member 21 by the upper damping element 58. The damping elements 55 to 58 are used for vibration isolation of the grinding unit 9 and the handle 11. Vibrations acting from the grinding unit 9 to the guide 24 during grinding are damped by the damping elements 55 to 58 so as to reduce vibrations acting on the machine frame 6 and the handle 11.

[0053] The lower damping elements 55 and 57 each have a first spring stiffness, while the upper damping elements 56 and 58 each have a second spring stiffness. The first spring stiffness is different from the second spring stiffness. The first spring stiffness is particularly greater than the second spring stiffness. This prevents undesirable vibrations of the height adjustment device 10 or the grinding unit 9 attached thereto. For further design and further operating modes, refer to the description of the typical embodiment above.

[0054] A third typical embodiment of the present invention is described below with reference to Figures 9 and 10. Unlike the typical embodiments described above, the spindle axis 43 and the rotation axis 48 are located on the side of the guide plane E facing outward from the handle 11. The spindle axis 43 and the rotation axis 48 are located on the first side of the guide plane E, and the handle 11 is located on the second side of the guide plane E. In contrast to the typical embodiments described above, the handle 11 is therefore located on the other side of the guide plane E. Thus, the grinding unit 9 is not located in the intermediate space between the machine frame 6 and the handle 11. This also provides clear viewing areas S1 and S2 on the rail head 2' of the rail 2 being ground. The drive motor 44 is not shown in Figures 9 and 10. Further design and further operating modes of the rail grinding machine 1 are described with reference to the description of the preceding typical embodiments.

[0055] Generally speaking, the individual features of a typical embodiment can be combined in any way.

Claims

1. A rail grinding machine for grinding track rails, particularly by manually moving and tilting it precisely along a single rail, - Machine frame (6), - Two rail guide units (7, 8) for guiding the rail grinding machine (1) precisely on one rail (2), - The rail guide units (7, 8) are spaced apart from each other in the longitudinal direction (x), - 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 driving a grinding tool (49) to rotate around a rotation 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), It is equipped with, The guide (24) of the height adjustment device (10) defines the guide plane (E), A rail grinding machine characterized in that the rotation axis (48) is spaced apart from the guide plane (E), particularly in the area of ​​the tool holder (47).

2. The rail grinding machine according to claim 1, characterized in that the distance A from the guide plane (E) of the rotation axis (48) is 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. The machine frame (6) comprises a lower longitudinal member (20) and an upper longitudinal member (21), The rail grinding machine according to claim 1 or 2, characterized in that the guide (24) is attached to the lower longitudinal member (20) and the upper longitudinal member (21).

4. The rail grinding machine according to at least one of claims 1 to 3, characterized in that the guide (24) comprises at least one guide unit (28, 29) for moving the grinding unit (9) in the adjustment direction (z).

5. The rail grinding machine according to claim 4, characterized in that the at least one guide unit (28, 29) each comprises a guide element (30, 32) and at least one damping element (55, 56, 57, 58).

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

7. The rail grinding machine according to claim 6, characterized in that the lower damping elements (55, 57) and the upper damping elements (56, 58) have different spring stiffnesses.

8. The rail grinding machine according to at least one of claims 1 to 7, characterized in that the height adjustment device (10) includes a carriage (25) attached to the guide (24) so ​​as to be displaceable in the adjustment direction (z).

9. The rail grinding machine according to claim 8, characterized in that the height adjustment device (10) and / or the spindle drive unit (27) of the grinding unit (9) are attached to the carriage (25).

10. The rail grinding machine according to at least one of claims 1 to 9, characterized in that the height adjustment device (10) comprises a spindle drive unit (27) having a spindle axis (43) that is spaced apart from the guide plane (E) and / or the rotation axis (48), particularly in the area of ​​the tool holder (47).

11. The rail grinding machine according to claim 10, characterized in that the spindle axis (43) is positioned between the guide plane (E) and the rotation axis (48).

12. The rail grinding machine according to claim 10 or 11, characterized in that the spindle drive unit (27) is arranged on the upper longitudinal member (21) of the machine frame (6).

13. The rail grinding machine according to at least one of claims 10 to 12, characterized in that the height adjustment device (10) comprises at least one damping element (39) for damping vibrations of the spindle drive unit (27).

14. The rail grinding machine according to at least one of claims 1 to 13, characterized in that the rotation axis (48) and / or the spindle axis (43) of the spindle drive unit (27) are arranged on the side of the guide plane (E) facing the handle (11).

15. The rail grinding machine according to at least one of claims 1 to 13, characterized in that the rotation axis (48) and / or the spindle axis (43) of the spindle drive unit (27) are arranged on the side of the guide plane (E) that faces outward from the handle (11).

16. The rail grinding machine according to at least one of claims 1 to 15, characterized in that the two rail guide units (7, 8) are pivotable with respect to the machine frame (6) about the longitudinal axis (12).

17. A rail grinding machine according to at least one of claims 1 to 16, characterized in that each of the two rail guide units (7, 8) comprises two dish-shaped discs (14, 15) and a guide roller (16).

18. A method for grinding the rails of a railway track, - A step of providing a rail grinding machine (1) according to at least one of claims 1 to 17, - A step of positioning the rail grinding machine (1) having the two rail guide units (7, 8) on the rail (2) to be ground, - The step of manually displacing the grinding unit (9) by manually displacing and tilting the rail grinding machine (1) using the handle (11), particularly by manually displacing the rail grinding machine (1) using the handle (11), A method that includes this.

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