EP3868529B1 - Guide rail - Google Patents

Description

The invention relates to a guide rail for guiding a saw chain in a guide groove of the guide rail according to the preamble of claim 1 and a working device comprising a guide rail and a saw chain.

From the US 4,819,332A a working device with a guide rail with a feed opening for feeding lubricant into the guide groove is known. The feed opening is arranged in the area of the clamping end of the guide rail. Lubricant gets into the guide groove via the feed opening and is conveyed by the saw chain during operation into regions of the guide groove that are remote from the feed opening. Sufficient lubrication between the guide rail and the saw chain is not always guaranteed, particularly for areas of the guide groove that are far away from the feed opening.

From the US 2013/0031793 A1 a guide rail is known which has a channel system in its interior, via which lubricant is supplied to the guide groove at various points. The production of the channel system is associated with great effort and the structural design of the guide rail is limited by the channel system.

From the DE 44 20 555 A1 a guide rail is known, the side parts of which are fastened to one another below the bottom of the groove by means of belt-like brackets.

A guide rail according to the preamble of claim 1 is made SU 406 725 A1 known.

The invention is based on the object of further developing a generic guide rail in such a way that good lubrication of a saw chain in the guide groove of the guide rail is made possible in a simple manner.

This problem is solved by a guide rail with the features of claim 1.

A further object of the invention consists in specifying a working device with a guide rail and a saw chain, in which good lubrication of the saw chain is possible in a simple manner.

This problem is solved by a working device with the features of claim 18 .

The invention provides that the groove base has at least one depression in the middle section for accommodating lubricant, opposite an immediately adjacent non-depressed area of the groove base. In the middle section, the bottom of the groove is free of supply openings for the supply of lubricant. Good lubrication is possible with the guide rail according to the invention, without the need for a complicated channel system that conveys lubricant through channels that open into feed openings in the groove base of the middle section. The at least one depression serves as a lubricant reservoir. The at least one depression can be filled with lubricant starting from the feed opening in the rear section of the guide rail. Cuttings, such as wood chips, can also accumulate in the depression. These cut chips can be used to temporarily store lubricant. Starting from the depression serving as a lubricant reservoir, lubricant can be carried along as a saw chain rotates into regions of the guide groove that are remote from the depression. The depression serving as a lubricant reservoir can be successively filled with lubricant from the feed opening become. As a result, lubricant can be conveyed stepwise from the lubricant supply opening in the rear section of the guide rail first into the central section of the guide rail and then transported further into a region of the guide groove which is even further away from the lubricant supply opening.

Advantageously, the groove base in the middle section has at least two indentations that are spaced apart from one another in the circumferential direction of the circumferential edge and are delimited on both sides in the circumferential direction of the circumferential edge by non-depressed areas of the groove base. As a result, a first depression, which is arranged closer to the feed opening, can first be filled with lubricant and then a second depression, which is further away from the feed opening than the first depression, can be filled with lubricant starting from the first depression. This allows lubricant to be transported gradually from one well to another. This enables the guide groove of the guide rail to be lubricated in areas of the guide groove that are far removed from the feed opening. The undepressed areas of the groove bottom cause a certain amount of lubricant to initially collect in a depression before excess lubricant continues to run over an undepressed area. In this way, it is also possible to prevent the lubricant from running off from a depression in the direction of a non-depressed area in areas in which depressions with a curved groove base are arranged. Lubricant reservoirs are formed in the undepressed areas through the interaction of depressions and undened areas. The lubricant can be transported from one lubricant reservoir to the next.

Expediently, a maximum groove depth measured perpendicular to the peripheral edge from the peripheral edge in the area of the groove side wall to the bottom of the groove in the area of the depression is at least 110%, in particular at least 125% circumferential edge from the circumferential edge in the area of the groove side wall to the groove bottom measured groove depth in a non-recessed area of the groove bottom. As a result, the recess is deep enough to serve as a lubricant reservoir.

Advantageously, the maximum groove depth in the area of the indentation is at most 160%, in particular at most 140%, preferably at most 135% of the groove depth in an unrecessed area of the groove base. As a result, the depression can be designed in such a way that it quickly fills with lubricant. If lubricant leaks out of the depression, the volume of the lubricant leaking out of the depression can be limited as a result. For example, when parking an implement provided with the guide rail, only a small amount of lubricant can escape from the guide rail.

In particular, a depression length of the depression measured in the direction of the longitudinal axis is at least 6%, in particular at least 8% of a length of the central section of the guide rail measured in the direction of the longitudinal center axis. As a result, the recess can be designed in such a way that sufficient lubricant for lubricating the guide groove can be accommodated in it.

The depression expediently has a largely constant groove depth over at least 50% of the length of the depression. This means that the largest value for the groove depth and the smallest value for the groove depth do not deviate from each other by more than 3% in a continuous area of the depression with a length of at least 50% of the depression length.

The indentation length is expediently greater than 100%, in particular greater than 150%, of the maximum groove depth.

In an advantageous development of the invention, the recess has an inlet slope and an outlet slope. In a conveying direction in which the lubricant is conveyed during operation of the guide rail, the depth of the groove in the area of the entry slope increases continuously. In the area of the outlet slope, the depth of the groove decreases continuously in the conveying direction. As a result, the recess can be easily filled with lubricant and the lubricant can be easily conveyed out of the recess. The conveying direction corresponds to the direction of circulation of the edge of the base support.

A total depression length, which corresponds to the sum of the depression lengths of all consecutive depressions in the middle section in a side view of the guide rail on exactly one of the two sides of the longitudinal central axis, is advantageously at least 15%, in particular at least 20%, of the length of the middle section of the guide rail. As a result, the middle section of the guide rail can be supplied with lubricant over its entire length.

In particular, an area length of the unrecessed area delimited by two indentations, measured in the direction of the longitudinal axis, is from 1.0% to 3.0% of the length of the middle section of the guide rail, measured in the direction of the longitudinal center axis. As a result, the non-recessed area can be designed in such a way that a sufficient amount of lubricant can be directed towards the saw chain to ensure sufficient lubrication, and at the same time there is enough space for the arrangement of recesses.

The length of the non-recessed area is advantageously less than 100%, in particular less than 50%, preferably less than 30% of the length of the recess. As a result, the non-recessed area can be designed in such a way that it is sufficiently supplied with lubricant from adjacent recesses. The length of the unrecessed area is expediently greater than the difference between the maximum groove depth in the area of the depression and the groove depth in an unrecessed area of the groove base. In particular, the area length of the undepressed area is three times as long as the maximum Difference between the maximum groove depth in the area of the recess and the groove depth in a non-recessed area of the groove base.

In an advantageous development of the invention, the bottom of the groove runs in the non-recessed area of the central section at a constant distance from the peripheral edge of the base support. In this context, the term "constant" includes distance values with a deviation of +/- 3% from a target value.

In an advantageous development of the invention, it is provided that the guide rail has two side plates, between which an intermediate plate is arranged, that the side plates and the intermediate plate form the base support, that the groove bottom of the guide groove is formed by an edge of the intermediate plate, and that the groove side walls of the Guide groove are formed by the side plates protruding over the intermediate plate. As a result, the guide rail can be manufactured in a simple manner.

It is advantageously provided that the guide rail extends in a central plane along the longitudinal central axis, that the intermediate plate has a plurality of openings that completely penetrate the intermediate plate in a transverse direction perpendicular to the central plane, that the openings of the intermediate plate are separated from one another by webs, that the webs are in the central plane running transversely to the longitudinal center axis, and that the webs connect unrecessed regions of the groove base arranged on opposite sides of the longitudinal center axis to one another in a side view of the guide rail. As a result, the guide rail can be designed to save weight and yet be stable. The non-recessed areas, which are connected by a web, are preferably opposite one another. Preferably, the non-recessed areas, at least in the middle section, are arranged mirror-symmetrically to a mirror plane that contains the longitudinal center axis and is perpendicular to the center plane. The webs advantageously run perpendicular to this mirror plane.

The webs expediently have thickenings in the area of their connection with the non-recessed areas in the circumferential direction. The side plate is advantageously connected to the intermediate plate in the area of the thickening. As a result, a stable connection of the intermediate plate to the side plate is possible in spite of the openings completely penetrating the intermediate plate in the area of the thickening. The bulges can be designed in such a way that they provide a sufficiently large connection surface for connection to the side plate. A connection of the side plate and the intermediate plate is realized in particular by welding. The side plate is advantageously welded to the connecting surface of the intermediate plate.

The working device according to the invention comprises the guide bar according to the invention and a saw chain. The saw chain is arranged in the guide groove around the base support and is tensioned, with the saw chain comprising drive links, and with each drive link being at a distance from the bottom of the groove in the tensioned state of the chain. Accordingly, the saw chain does not come into contact with the shallow areas of the groove base during operation. Shavings, such as wood shavings, that have accumulated in the depression can be used to temporarily store lubricant. The drive links can be lubricated by contact with such lubricant-impregnated cuttings. Such a contact also enables the transport of lubricant by means of the drive links into regions of the guide groove that are remote from the recess during one revolution of the saw chain. Transporting the lubricant from the recess is also possible, for example, by pivoting the guide rail.

Fig. 1

eine schematische perspektivische Darstellung eines handgeführten Arbeitsgeräts mit einer Führungsschiene,

Figuren 2 und 3

perspektivische Darstellungen einer Führungsschiene,

Fig. 4

eine Seitenansicht der Führungsschiene nach Fig. 3,

Fig. 5

eine Seitenansicht der Führungsschiene aus Fig. 2,

Fig. 6

eine nicht maßstabsgetreue, verzerrte Schnittdarstellung entlang der Linie VI-VI aus Fig. 5,

Fig. 7

eine nicht maßstabsgetreue, verzerrte Seitenansicht der Führungsschiene aus Fig. 4 in Richtung des Pfeils VII in Fig. 4,

Fig. 8

eine Explosionsdarstellung der Führungsschiene aus Fig. 3,

Fig. 9

eine Seitenansicht auf eine Seitenplatte der Führungsschiene nach Fig. 8,

Fig. 10

eine Seitenansicht auf eine Zwischenplatte der Führungsschiene nach Fig. 8,

Fig. 11

eine Seitenansicht auf die Zwischenplatte und die Seitenplatte der Führungsschiene aus Fig. 8,

Fig. 12

eine perspektivische Darstellung der Führungsschiene nach Fig. 3 ohne Abdeckplatte,

Fig. 13

eine Seitenansicht der Führungsschiene nach Fig. 12,

Fig. 14

eine Seitenansicht der Führungsschiene nach Fig. 2, wobei verdeckte Bauteile gestrichelt dargestellt sind,

Fig. 15

eine ausschnittsweise, vergrößerte Darstellung des Details XV aus Fig. 14,

Fig. 16

eine Seitenansicht der Führungsschiene nach Fig. 2 mit einer darauf gespannten Sägekette,

Fig. 17

eine ausschnittsweise, vergrößerte Darstellung des Details XVII aus Fig. 16.

An embodiment of the invention is explained below with reference to the drawing. Show it:

1

a schematic perspective view of a hand-held tool with a guide rail,

Figures 2 and 3

perspective representations of a guide rail,

4

a side view of the guide rail 3 ,

figure 5

a side view of the guide rail 2 ,

6

an out-of-scale, distorted sectional view taken along line VI-VI figure 5 ,

7

shows a distorted side view of the guide rail, not to scale 4 in the direction of arrow VII in 4 ,

8

an exploded view of the guide rail 3 ,

9

a side view of a side plate of the guide rail 8 ,

10

a side view of an intermediate plate of the guide rail 8 ,

11

a side view of the intermediate plate and the side plate of the guide rail 8 ,

12

a perspective view of the guide rail 3 without cover plate,

13

a side view of the guide rail 12 ,

14

a side view of the guide rail 2 , where hidden components are shown as dashed lines,

15

a partial, enlarged representation of detail XV 14 ,

16

a side view of the guide rail 2 with a saw chain stretched on it,

17

a sectional, enlarged representation of detail XVII 16 .

1 shows a hand-held tool 110 with a guide rail 1. In the exemplary embodiment, the hand-held tool 110 is a motor chain saw. A saw chain 101 runs around the guide rail 1 when the hand-held working device 110 is in operation. The saw chain 101 is driven in rotation by a drive motor (not shown) of the working device 110 .

2 shows a perspective view of the guide rail 1 . In the exemplary embodiment, the guide rail 1 has a sprocket wheel 8 . The guide rail 1 comprises a base support 5. The base support 5 has a peripheral edge 6. A guide groove 60 runs in the peripheral edge 6. The guide groove 60 serves to accommodate the saw chain 101. When the working device 110 is in operation, the saw chain 101 is guided in the guide groove 60 .

3 shows the guide rail 1 2 without star wheel.

4 shows the guide rail 1 3 in a side view. The guide rail 1 extends along a longitudinal center axis 100 over a longitudinal extension 7. The guide rail 1 extends in a center plane M. The center plane M runs parallel to the plane of the planar guide rail 1. The longitudinal center axis 100 runs in the center plane M. The longitudinal center axis 100 divides the center plane M into a first side 11 and a second side 12.

The guide rail 1 has a rear section 3 for fixing the guide rail 1 to the working device 110 . The guide rail 1 has a front section 4 for deflecting the saw chain 101 . A middle section 2 of the guide rail 1 is arranged between the rear section 3 and the front section 4 . The middle section 2 extends over half of the longitudinal extent 7, starting from the rear section 3 to the front section 4. The rear section 3 and the front section 4 each extend over a quarter of the longitudinal extent 7. In the rear section 3 of the guide rail 1 a supply opening 41 for supplying lubricant into the guide groove 60 is arranged. The feed opening 41 opens into the guide groove 60. In the exemplary embodiment, the guide rail 1 can be turned about the longitudinal central axis 100, and a feed opening 41, 42 is arranged on both sides 11, 12. The lubricant is supplied via the in 9 shown supply opening 42, which is arranged on the first side 11 of the center plane M.

figure 5 shows a side view of the guide rail 2 with the sprocket wheel 8. Without the sprocket wheel 8, the guide rail 1 has a length 1 measured in the direction of the longitudinal central axis 100. The longitudinal extent 7 extends over the entire length 1 of the guide rail 1.

6 shows a distorted representation of a section along the in figure 5 marked section line VI-VI. The representation is greatly enlarged in a transverse direction 50 . The transverse direction 50 runs perpendicular to the longitudinal central axis 100. As in FIG 4 shown, the transverse direction 50 is perpendicular to the median plane M.

The guide groove 60 is defined by a groove base 63, a first groove side wall 61 and a second groove side wall 62 ( 6 ) limited. The first groove side wall 61 and the second groove side wall 62 are opposite each other with respect to the transverse direction 50 .

7 shows a distorted representation of a view of the guide rail 1 in the direction of the arrow VII, which is not true to scale 4 . The illustration is greatly enlarged only in the transverse direction 50 and not in the direction of the longitudinal central axis 100 . In this view, perpendicular to the longitudinal center axis 100 and perpendicular to the transverse direction 50, the bottom of the groove 63 can be seen in the middle section 2 of the guide rail 1.

From the synopsis of figures 6 and 7 the result is that the groove base 63 in the central section 2 has at least one depression 64, 65, 66 for receiving lubricant, opposite an immediately adjacent non-depressed region 67, 68 of the groove base 63. The groove base 63 has in the middle section 2 at least two in the circumferential direction 70 of the circumferential edge 6 spaced depressions 64, 65, 66. The direction of rotation 70 is the direction in which the saw chain 101 moves guided on the guide rail 1 during operation. As in 4 shown, the direction of rotation 70 runs on the first side 11 of the center plane M in the direction from the rear section 3 to the front section 4 of the guide rail 1. On the second side 12 of the center plane M, the direction of circulation 70 runs in the direction from the front section 4 towards the rear section 3 of the guide rail 1.

In the exemplary embodiment, the at least two depressions 64 , 65 , 66 spaced apart from one another in the circumferential direction 70 of the circumferential edge 6 are delimited on both sides in the circumferential direction 70 of the circumferential edge 6 by unrecessed regions 67 , 68 of the groove base 63 . this is in 7 shown for recess 65. In the middle section 2 of the guide rail 1, the bottom of the groove 63 is a closed surface. The bottom of the groove 63 is free of supply openings for the supply of lubricant in the middle section 2 . In the middle section 2, the bottom of the groove 63 also has no other openings. The entire bottom of the groove 63 in the middle section 2 of the guide rail is a continuous uninterrupted surface. This does not preclude the groove base 63 having abutting or joining edges at which adjacent components delimiting the groove base 63 abut.

In the middle section 2 of the guide rail 1, the groove side walls 61 and 62 in the area of the depressions 64, 65, 66 are free of openings. This ensures that lubricant can collect in the recesses 64, 65, 66. The lubricant cannot drain through openings in the groove side walls 61, 62. Each indentation 64, 65, 66 of the groove base 63 forms, with the groove side walls 61 and 62, a trough for receiving lubricant.

As in 6 shown, the guide groove 60 in the area of the depression 64, 65, 66 has a maximum groove depth t2 measured perpendicularly to the peripheral edge 6 from the peripheral edge 6 in the area of the groove side wall 61, 62 to the groove bottom 63. In the undepressed area 67 , 68 of the groove base 63 , the guide groove has a groove depth 11 measured perpendicularly to the peripheral edge 6 from the peripheral edge 6 in the area of the groove side wall 61 , 62 to the groove base 63 . The maximum groove depth t2 in the area of the depression 64, 65, 66 is at least 110% of the groove depth t1 in the unrecessed area 67, 68 of the groove base 63. In the exemplary embodiment, the maximum groove depth t2 in the area of the depression 64, 65, 66 is at least 125% of the Groove depth t1 in the unrecessed area 67, 68 of the groove base 63.

The maximum groove depth t2 in the area of the depression 64, 65, 66 is a maximum of 160% of the groove depth t1 in the unrecessed area 67, 68 of the groove base 63. In the exemplary embodiment, the maximum groove depth t2 in the area of the depression 64, 65, 66 is a maximum of 140% Groove depth t1 in the unrecessed area 67, 68 of the groove base 63.

8 shows an exploded view of the guide rail 1. The guide rail 1 is a built-up guide rail. The base support 5 of the guide rail 1 comprises a first side plate 51, a second side plate 52 and a Intermediate plate 53. The intermediate plate 53 is arranged between the two side plates 51 and 52.

As in 8 shown, the guide rail 1 comprises a first cover plate 31 and a second cover plate 32. From the synopsis of figures 6 and 8th It follows that when the guide rail 1 is in the assembled state, the cover plates 31, 32 are accommodated in the recess 56 of the side plates 51, 52. The cover plates 31, 32 rest on the intermediate plate 53 on opposite sides. The cover plates 31, 32 cover the openings 25, 26, 27 in the intermediate plate 53 completely. Each cover plate 31, 32 covers all of the openings 25, 26 and 27 in the intermediate plate 53. The intermediate plate 53 is arranged between the first cover plate 31 and the second cover plate 32 in the transverse direction 50 .

9 shows a side plate 51, 52. The first side plate 51 and the second side plate 52 are designed identically. Both side plates 51, 52 have a recess 56 on. The recess 56 is an opening in the side plate 51, 52 that completely penetrates the side plate 51, 52 in the transverse direction 50. The first side plate 51 has the first feed opening 41. The second side plate 52 has the second supply port 42 . The feed opening 41 , 42 is an opening that completely penetrates the side plate 51 , 52 in the transverse direction 50 . As can be seen from the synopsis of the figures 4 and 8th results, the side plates 51, 52 of the guide rail 1 are arranged in such a way that the first feed opening 41 is on the second side 12 of the center plane M and the second feed opening 42 is on the first side 11 of the center plane M. Through the feed opening 41, 42, the Guide groove 60 lubricant are supplied. In the exemplary embodiment, the lubricant is oil.

10 shows the intermediate plate 53. The intermediate plate 53 has openings 25, 26 and 27, of which in 10 three openings are designated as an example. The openings 25, 26, 27 completely penetrate the intermediate plate 53 in the transverse direction 50. In the assembled state of the guide rail 1 encloses the outline of the recess 56 in the side plate 51, 52 seen in the transverse direction 50, the openings 25, 26, 27 of the intermediate plate 53 completely. For example, this is in 12 shown.

11 shows an arrangement consisting of the second side plate 52 and the intermediate plate 53. This arrangement corresponds to the guide rail 1 from FIGS Figures 3 and 8th , but without the cover plates 31 and 32 and without the first side plate 51. 11 shows a side view of the arrangement with a view of the intermediate plate 53 arranged on the second side plate 52. From the synopsis of FIG figures 6 and 11 it becomes clear that the groove base 63 of the guide groove 60 is formed by an edge of the intermediate plate 53 . The edge of the intermediate plate 53 is located on the peripheral side of the intermediate plate 53 . The edge of the intermediate plate 53 runs around the intermediate plate 53 in the circumferential direction 70 . The second groove side wall 62 of the guide groove 60 is formed by the second side plate 52 projecting beyond the intermediate plate 53 in the direction away from the longitudinal central axis 100 . As in 6 shown, the first groove side wall 61 of the guide groove 60 is formed by the first side plate 51 protruding beyond the intermediate plate 53 in the direction away from the longitudinal central axis 100 .

As in 11 shown, the first feed opening 41 in the rear section 3 of the guide rail 1 completely penetrates the second groove side wall 62 in the transverse direction 50 . As a result, lubricant can get through the second groove side wall 62 through the feed opening 41 and into the guide groove 60 .

The rear section 3 of the guide rail 1 has a length l3 measured in the direction of the longitudinal central axis 100 . The middle section 2 of the guide rail 1 has a length l2 measured in the longitudinal center axis 100 . The front section 4 of the guide rail 1 has a length l4 measured in the direction of the longitudinal central axis 100 . The length l2 of the middle section 2 is half the length 1 of the guide rail 1. The length l3 of the rear section 3 and the length l4 of the front section 4 of the guide rail 1 are each a quarter of the length l of the guide rail 1. The longitudinal extension 7 of the guide rail 1 extends over the entire length l of the guide rail 1.

In the central section 2 of the guide rail 1, the groove base 63 has at least one depression 64, 65, 66 on each of the two sides 11, 12 of the central plane M divided by the longitudinal center axis 100, opposite the directly adjacent non-depressed area 67, 68 of the groove base 63. In the exemplary embodiment, seven complete depressions 64, 65, 66 are arranged in the groove base 63 in the central section 2 of the guide rail 1 on the first side 11 of the central plane M, three of which are designated as examples. Likewise, on the second side 12 of the center plane M in the middle section 2 of the guide rail 1, seven complete depressions are arranged in the groove base 63.

In the direction of rotation 70 , the indentations are delimited on both sides by a non-indented area of the groove base 63 of the guide groove 60 . An example is in 11 designates the recess 65, which is delimited in the direction of rotation 70 by the unrecessed area 67 and by the unrecessed area 68.

The bottom of the groove 63 has on the second side 12 of the center plane M in the middle section 2 of the guide rail unrecessed areas 77, 78. The unrecessed area 77 is opposite to the unrecessed area 67 in the direction perpendicular to the longitudinal center axis 100 with respect to the longitudinal center axis 100 . The unrecessed area 78 is opposite the unrecessed area 68 in the direction perpendicular to the longitudinal center axis 100 with respect to the longitudinal center axis 100 .

The indentation 65 has an indentation length v2 measured in the direction of the longitudinal center axis 100 . The depression 64 has a depression length v1 and the depression 66 has a depression length v3. The indentation length v1, v2, v3 is in each case at least 6% of the length l2 of the middle section 2 of the guide rail. In the exemplary embodiment, the indentation length v1, v2, v3 is at least 8% of the length l2 of the middle section 2 of the guide rail 1.

A total depression length, which corresponds to the sum of the depression lengths v1, v2, v3 of all depressions in the groove base 63 on the first side 11 of the center plane M in the middle section 2 of the guide rail 1, is at least 15%, in particular at least 20%, preferably at least 30% Length l2 of the middle section 2 of the guide rail. In the exemplary embodiment, the sum of the depression lengths of all depressions on the first side 11 of the center plane M in the middle section 2 of the guide rail 1 is at least 40% of the length l2 of the middle section 2 of the guide rail 1. It can also be provided that the sum of the depression lengths of all Depressions on the first side 11 of the center plane M in the middle section 2 of the guide rail 1 is at least 50% of the length l2 of the middle section 2 of the guide rail 1. All values specified for the sum of the depression lengths of all depressions on the first side 11 of the center plane M in the middle section 2 of the guide rail 1 also apply to the sum of the depression lengths of all depressions in the groove base 63 on the second side 12 of the center plane M in the middle section 2 of the Guide rail 1 in an analogous manner.

As in 11 shown, the unrecessed area 67 delimited by two indentations 64 and 65 has an area length b measured in the direction of the longitudinal central axis 100 . The unrecessed area 68 delimited by the two indentations 65 and 66 also has an area length b measured in the direction of the longitudinal central axis 100 . The area length b of the unrecessed area 67, 68 is in each case from 1.0% to 3.0% of the length l2 of the central section 2 of the guide rail 1, measured in the direction of the longitudinal central axis.

The area length b of the unrecessed area 67, 68 is smaller than the indentation length v1, v2, v3. In particular, the area length b is less than 50% of the indentation length v1, v2, v3. In the exemplary embodiment, the area length b of the unrecessed area 67, 68 is less than 30% of the indentation length v1, v2, v3. The area length b of each unrecessed area 67, 68 of the guide rail 1 is advantageously less than the indentation length v1, v2, v3, in particular less than 50%, in particular less than 30% of the indentation length v1, v2, v3.

12 shows the base support 5. The base support 5 has a plurality of openings 20, 21 and 22 lying next to one another in the direction of the longitudinal central axis 100, of which in 12 three are named as examples. The openings 20, 21, 22 completely penetrate the base support 5 in the transverse direction 50. The opening 20 in the base support 5 is through the recess 56 in the first side plate 51 in 12 not shown recess 56 in the second side plate 52 and through the opening 25 in the intermediate plate 53 is formed. The openings 21 and 22 are formed in an analogous manner. The opening 26 in the intermediate plate 53 is assigned to the opening 21 in the base support 5 and the opening 27 in the intermediate plate 53 is assigned to the opening 22 in the base support 5 . The intermediate plate 53 has webs 23, 24 between the openings 25, 26 and 27. The web 23 lies between the openings 25 and 26. The web 24 lies between the openings 26 and 27. The webs 23 and 24 delimit the openings 20, 21 and 22 in the base support 5. As in FIG 13 shown, the webs 23, 24 run transversely in the center plane M, in particular approximately perpendicular to the longitudinal center axis 100.

As can be seen from the synopsis of the figures 5 , 6 and 12 results, the web 23 is arranged between the cover plates 31 and 32 in the assembled state of the guide rail 1 . The cover plates 31 and 32 can be supported on the web 23 when the guide rail 1 is in operation. It can also be provided that the cover plates 31 and 32 are connected to the webs 23, 24, 25. A connection between a web 23 and the cover plate 31, 32 can be designed such that the Openings 25 and 26, which are separated from one another by web 23, are fluidly connected to one another despite the connection. A fluid can flow from one opening 25 to the other opening 26 via the intermediate space between the web 23 and the cover plate 31 , 32 .

As in 10 shown, the webs 23, 24 connect in a side view of the guide rail 1 or the intermediate plate 53 on the two sides of the longitudinal center axis 100 opposite non-recessed areas 67, 68, 77, 78 of the groove base 63 with each other. This is also in 11 shown. The web 24 connects the unrecessed area 68 on the first side of the midplane M with the unrecessed area 78 on the second side of the midplane M. The web 23 connects the unrecessed area 67 on the first side of the midplane M with the unrecessed area 77 on the second side of the midplane M, like 10 shows.

The webs 23, 24 have thickenings 54 in the area of their connection to the non-recessed areas in the circumferential direction 70.

14 shows a schematic side view of the guide rail 1. In this view, components of the guide rail 1 that are covered by the first side plate 51 or the first cover plate 31 are shown in dashed lines. The recess 56 of the first side plate 51 has an edge 57. The edge 57 runs around the recess 56 in the circumferential direction 70. FIG. The edge 57 delimits the recess 56 in the center plane M. The intermediate plate 53 overlaps the edge 57 of the recess 56 along the entire circumference of the recess 56. The intermediate plate 53 projects in the direction away from the longitudinal center axis 100 over the edge 57 of the recess 56 of the Side plate 51 out.

15 shows a detail 14 . The peripheral edge 6 of the base support 5 has a minimum distance measured perpendicular to the peripheral edge 6 of the base support 5 min to the edge 57 of the recess 56 of the side plate 51. The intermediate plate 53 overlaps the edge 57 of the recess 56 of the side plate 51 in the direction perpendicular to the peripheral edge 6 of the base support 5 by an overlap width s of at least 20% of the minimum distance min. In an analogous manner, the side plate 52 overlaps the intermediate plate 53.

As in 14 As shown, the first side plate 51 has projections 58 . The second side plate 52 has projections 58 in an analogous manner. The projections 58 are arranged on the edge 57 of the recess 56 and protrude into the recess 56 in the direction of the longitudinal central axis 100 . The undepressed areas 67, 68 of the groove base 63 of the intermediate plate 53 are arranged in the same areas as the projections 58 of the side plates 51, 52 in the direction of rotation 70. The projections 58 of the side plates 51, 52 are arranged in the same areas as the thickenings 54 of the webs 23, 24 of the intermediate plate 53 in the direction of rotation 70. The thickenings 54 of the intermediate plate 53 overlap the projections 58 of the side plates 51, 52. The thickenings 54 of the webs 23, 24 of the intermediate plate 53 protrude in the direction of the longitudinal central axis 100 over the projections 58 of the side plates 51, 52.

The projections 58 of the side plates 51, 52 are connected to the intermediate plate 53 in the area of the thickenings 54 of the webs 23, 24 of the intermediate plate. The intermediate plate 53 and the side plates 51, 52 are made of metal. The intermediate plate 53 and the side plates 51, 52 are connected to each other via spot welds. The welding points are arranged between the thickenings 54 of the intermediate plate 53 and the projections 58 of the side plates 51, 52. The spot welds are located at the undepressed areas 67,68.

As in 15 shown, the groove base 63 in the unrecessed area 67, 68 of the central section 2 has a distance a1 from the circumferential edge 6 of the base support 5, measured in the direction perpendicular to the circumferential edge 6 of the base support 5. The groove base 63 runs in the central section 2 in the unrecessed area 67 , 68 in constant distance a1 to the peripheral edge 6. All undepressed areas of the central section 2 have the constant distance a1 to the peripheral edge 6 of the base support 5. The term “constant” in the present case refers to a value that is constant within the framework of normal manufacturing tolerances and includes a range with a deviation of +/-3% from a target value.

As in 14 shown, the non-deep areas 67, 68 lie on a normal level 80 drawn in with dots. The normal level 80 has the constant distance a1 ( 15 ). As in 14 as can be seen, the indentations 64, 65, 66 are recessed relative to the normal level 80 and thus relative to the non-recessed areas 67, 68. In 15 a differential depth Δt is drawn in. The differential depth Δt corresponds to the difference between the maximum groove depth t2 of the depression 64, 65, 66 and the groove depth t1 in the unrecessed area 67, 68. The differential depth Δt is at least 20% of the area length b of the unrecessed area 67, 68. The differential depth Δt is at most 50%, in particular at most 40% of the area length b of the unrecessed area 67, 68. In the exemplary embodiment, the differential depth Δt is from 0.5 mm to 1.5 mm.

The depression length v2 is at least twice, in the exemplary embodiment at least three times, the maximum groove depth t2. The same applies to the indentation lengths v1 and v3. The area length b of the unrecessed area 67, 68 is at most three times as large as the differential depth Δt. Advantageously, the depression lengths v1, v2, v3 of all depressions 64, 65, 66 of the guide rail 1 in the central section 2 are at least twice, preferably at least three times, the maximum groove depth t2. The depression length v2 is at least five times, in the exemplary embodiment at least ten times as large as the differential depth Δt. The same applies to the indentation lengths v1 and v3.

The area length b of the unrecessed area 67, 68 is less than 100%, in particular less than 50%, of the indentation length v2 of the indentation 65. The same also applies to the indentation length v1 of indentation 64 and the indentation length v3 of indentation 66.

The recess 64 , 65 , 66 has an inlet bevel 73 and an outlet bevel 74 . The groove depth measured perpendicularly to the circumferential edge 6 of the base support 5 between the circumferential edge 6 and the groove base 63 in the area of the inlet bevel 73 increases in the circumferential direction 70, starting from the unrecessed area 67, 68 to the area of the depression 65 with maximum groove depth t2. The groove depth decreases in the area of the run-out bevel 74 in the direction of rotation 70 starting from the area of the depression 65 with maximum groove depth t2 to the non-depressed area 68 .

The depression 65 has a largely constant groove depth over at least 50% of the depression length v2. The largely constant groove depth in this area corresponds to the maximum groove depth 12. In this context, largely constant means that the groove depth does not deviate from a target value by more than +/- 3%.

The synopsis of Figures 12 and 14 makes it clear that the peripheral edge 6 of the base support 5 in the middle section 2 of the guide rail 1 in the region of the groove side walls 61, 62 is formed in the direction perpendicular to the edge 6 without any depressions. The peripheral edge 6 forms a track for the saw chain 101 in the area of the groove side walls 61 and 62 and is smooth and unprofiled. Only the base of the groove 63 has a profile in the form of the depressions 64 , 65 , 66 .

The figures 11 and 14 show elevations 75 of the groove base 63. One of the two elevations 75 is in the direction of rotation 70 in front of the first feed opening 41, and the other of the two elevations 75 is in the direction of rotation 70 behind the first feed opening 41. Between the elevations 75 is a reservoir for collecting lubricant formed, which enters the guide groove 60 via the feed opening 41 . The elevations 75 protrude beyond the normal level 80 in the direction away from the longitudinal center axis 100 . In relation to the normal level 80, the increases represent 75 Increases in the bottom of the groove 63. The increases 75 are arranged in the rear section 3. In contrast, in the middle section 2 of the guide rail 1 there is no elevation of the groove base 63 above the normal level 80 .

16 shows the guide rail 1 with the saw chain 101 arranged on the guide rail 1. The saw chain 101 is arranged in the guide groove 60 around the base support 5 and is tensioned. The saw chain is typically tensioned by means of a tensioning device (not shown) of the 1 shown implement 110.

17 shows an enlarged detail view of the in 16 area marked XVII. The saw chain 101 consists of central drive links 102 with respect to the transverse direction 50, which are connected to one another via lateral connecting links 103. The connecting links 103 are partly designed as right-hand cutting links 104 or left-hand cutting links 105 . The connecting links 103 and the driving links 102 are connected to one another in an articulated manner by means of rivets 106 . To guide the saw chain 101, the drive links 102 engage in the guide groove 60 of the guide rail 1. Starting from the peripheral edge 6 of the base support 5, drive lugs 107 of the drive links 102 protrude into the guide groove 60 in the direction of the longitudinal central axis 101. There is a distance a between each drive link 102 and the groove base 63. This applies in particular to the middle section 2 of the guide rail 1. The saw chain 101 is guided through the guide groove 60 without contact with the groove base 63. In particular, the extensions 107 of the drive links 102 of the saw chain 101 have no contact with the bottom of the groove 63.

Claims (18)

1. Guide rail for guiding a saw chain (101) in a guide groove (60) of the guide rail (1), wherein the guide rail (1) extends over a longitudinal extent (7) along a longitudinal central axis (100) and has a rear portion (3) for fixing of the guide rail (1) to a work device (110), has a front portion (4) for diversion of the saw chain (101) and has a middle portion (2) which is arranged between the rear portion (3) and the front portion (4), wherein the middle portion (2) extends over half of the longitudinal extent (7) between the rear portion (3) and the front portion (4), wherein the rear portion (3) and the front portion (4) each extend over a quarter of the longitudinal extent (7), wherein the guide rail (1) comprises a main carrier (5), wherein the main carrier (5) has a peripheral edge (6), wherein the guide groove (60), with a groove base (63) and two groove side walls (61, 62), extends in the peripheral edge (6), and wherein, in the rear portion (3), there is arranged at least one feed opening (41, 42) for feeding of lubricant, which at least one feed opening opens out into the guide groove (60), wherein, in the middle portion (2), for the purpose of receiving lubricant, the groove base (63) has at least one depression (64, 65, 66) in relation to a directly adjacent non-depressed region (67, 68) of the groove base (63), characterized in that, in the middle portion (2), the groove base (63) is free of feed openings for feeding of lubricant.
2. Guide rail according to Claim 1,
   characterized in that, in the middle portion (2), the groove base (63) has at least two depressions (64, 65, 66) which are spaced apart from one another in a peripheral direction (70) of the peripheral edge (6), and in that the depressions (64, 65, 66), in the peripheral direction (70) of the peripheral edge (6), are delimited at both sides by non-depressed regions (67, 68) of the groove base (63).
3. Guide rail according to Claim 1 or 2,
   characterized in that the guide groove (60) has a groove depth (t1, t2), which is measured perpendicularly to the peripheral edge (6) from the peripheral edge (6) in the region of the groove side wall (61, 62) as far as the groove base (63), and in that the maximum groove depth (t2) in the region of the depression (64, 65, 66) is at least 110% of the groove depth (t1) in a non-depressed region (67, 68) of the groove base (63).
4. Guide rail according to Claim 3,
   characterized in that the maximum groove depth (t2) in the region of the depression (64, 65, 66) is at most 160% of the groove depth (t1) in a non-depressed region (67, 68) of the groove base (63).
5. Guide rail according to one of Claims 1 to 4,
   characterized in that the depression (64, 65, 66) has a depression length (v1, v2, v3), which is measured in a direction of the longitudinal axis (100), and in that the depression length (v1, v2, v3) is at least 6% of a length (l2), measured in the direction of the longitudinal central axis (100), of the middle portion (2) of the guide rail (1).
6. Guide rail according to Claim 5,
   characterized in that the depression (64, 65, 66) has a largely constant groove depth (t2) over at least 50% of the depression length (v1, v2, v3).
7. Guide rail according to Claim 5 or 6,
   characterized in that the depression length (v1, v2, v3) is greater than 100% of the maximum groove depth (t2).
8. Guide rail according to one of Claims 5 to 7,
   characterized in that the depression (64, 65, 66) has a run-in bevel (73) and a run-out bevel (74).
9. Guide rail according to one of Claims 1 to 8,
   characterized in that a total depression length, which corresponds to the sum of the depression lengths (v1, v2, v3) of all the successive depressions (64, 65, 66) in the middle portion (2) in a side view of the guide rail (1) on exactly one of the two sides (11, 12) of the longitudinal central axis (100), is at least 15% of the length (l2) of the middle portion (2) of the guide rail (1).
10. Guide rail according to one of Claims 2 to 9,
    characterized in that the non-depressed region (67, 68), which is delimited by two depressions (64, 65, 66), has a region length (b), which is measured in the direction of the longitudinal axis (100), and in that the region length (b) is 1.0% to 3.0% of the length (l2), measured in the direction of the longitudinal central axis (100), of the middle portion (2) of the guide rail (1).
11. Guide rail according to one of Claims 2 to 10,
    characterized in that the region length (b) of the non-depressed region (67, 68) is less than 100% of the depression length (v1, v3, v3).
12. Guide rail according to one of Claims 2 to 11,
    characterized in that the region length (b) of the non-depressed region (67, 68) is greater than the difference between the maximum groove depth (t2) in the region of the depression (64, 65, 66) and the groove depth (t1) in a non-depressed region (67, 68) of the groove base (63).
13. Guide rail according to one of Claims 2 to 12,
    characterized in that the region length (b) of the non-depressed region (67, 68) is at most three times as large as the difference between the maximum groove depth (t2) in the region of the depression (64, 65, 66) and the groove depth (t1) in a non-depressed region (67, 68) of the groove base (63).
14. Guide rail according to one of Claims 1 to 13,
    characterized in that, in the non-depressed region (67, 68) of the middle portion (2), the groove base (63) extends at a constant distance (a1) from the peripheral edge (6) of the main carrier (5).
15. Guide rail according to one of Claims 1 to 14,
    characterized in that the guide rail (1) has two side plates (51, 52), between which an intermediate plate (53) is arranged, in that the side plates (51, 52) and the intermediate plate (53) form the main carrier (5), in that the groove base (63) of the guide groove (60) is formed by an edge of the intermediate plate (53), and in that the groove side walls (61, 62) of the guide groove (60) are formed by the side plates (51, 52), which protrude beyond the intermediate plate (53).
16. Guide rail according to Claim 15,
    characterized in that the guide rail (1) extends in a central plane (M) along the central longitudinal axis (100), in that the intermediate plate (53) has multiple openings (25, 26, 27) which fully extend through the intermediate plate (53) in a transverse direction (50) perpendicular to the central plane (M), in that the openings (25, 26, 27) are separated from one another by webs (23, 24), in that the webs (23, 24) extend in the central plane (M) transversely to the longitudinal central axis (100), and in that the webs (23, 24) interconnect non-depressed regions (67, 68, 77, 78) of the groove base (63) that are arranged on opposite sides (11, 12) of the longitudinal central axis (100).
17. Guide rail according to Claim 16,
    characterized in that the webs (23, 24) have thickenings (54) in the peripheral direction (70) in the region of their connection to the non-depressed regions (67, 68, 77, 78), and in that the side plate (51, 52) is connected to the intermediate plate (53) in the region of the thickenings (54).
18. Work device comprising a guide rail according to one of Claims 1 to 17 and a saw chain, wherein the saw chain (101) is tensioned and arranged peripherally around the main carrier (5) in the guide groove (60), wherein the saw chain (101) comprises drive links (102), and wherein, in the tensioned state of the chain, there is a distance (a) between each drive link (102) and the groove base (63).

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