EP3868529A1 - Guide rail - Google Patents

Abstract

A guide bar for guiding a saw chain (101) in a guide groove (60) of the guide bar (1) extends along a longitudinal center axis (100) over a longitudinal extension (7) and has a rear section (3) for fixing the guide bar (1) a working device (110), a front section (4) for deflecting the saw chain (101) and a middle section (2) arranged between the rear section (3) and the front section (4). The middle section (2) extends over half of the longitudinal extension (7) between the rear section (3) and the front section (4). The rear section (3) and the front section (4) each extend over a quarter of the longitudinal extension (7). The guide rail (1) comprises a base support (5) with a circumferential edge (6) in which the guide groove (60) runs with a groove base (63) and two groove side walls (61, 62). At least one feed opening (41, 42) for feeding lubricant into the guide groove (60) opens in the rear section (3). The groove base (63) has at least one indentation (64, 65, 66) in the middle section (2) for receiving lubricant, opposite a directly adjacent, non-indented area (67, 68) of the groove base (63) and is in the middle section (2 ) free of feed openings for the feed of lubricant. In the case of an implement with a guide bar (1) and a saw chain (101), there is a distance (a) between drive links (102) and the groove base (63).

Description

The invention relates to a guide bar for guiding a saw chain in a guide groove of the guide bar according to the preamble of claim 1 and to an implement comprising a guide bar and a saw chain.

From the U.S. 4,819,332 A 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 region of the clamping end of the guide rail. Lubricant enters the guide groove via the feed opening and, during operation, is conveyed by the saw chain into areas of the guide groove that are remote from the feed opening. Sufficient lubrication between the guide bar and the saw chain is not always guaranteed, in particular 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 restricted by the channel system.

The invention is based on the object of 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 object is achieved by a guide rail with the features of claim 1.

Another object of the invention is to provide an implement with a guide bar and a saw chain, in which good lubrication of the saw chain is possible in a simple manner.

This object is achieved by a working device with the features of claim 18.

The invention provides that the groove base has at least one indentation in the central section for receiving lubricant opposite a directly adjacent, non-indented area of the groove base. In the middle section, the groove base is free of feed openings for the feed of lubricant. The guide rail according to the invention enables good lubrication without the need for a complicated channel system that conveys lubricant through channels that open into feed openings in the groove base of the central section. The at least one recess serves as a lubricant reservoir. The at least one recess can be filled with lubricant starting from the feed opening in the rear section of the guide rail. Cut shavings, such as wood shavings, can also accumulate in the depression. These cutting chips can be used for the intermediate storage of lubricant. Starting from the recess serving as a lubricant reservoir, lubricant can be taken along when a saw chain rotates in areas of the guide groove that are remote from the recess. The depression serving as a lubricant reservoir can be successively filled with lubricant from the feed opening will. As a result, lubricant can be conveyed step-by-step from the supply opening for supplying lubricant in the rear section of the guide rail first into the middle section of the guide rail and then further transported into an area of the guide groove that is even further away from the supply opening for supplying lubricant.

In the middle section, the groove base advantageously has at least two depressions which are spaced apart from one another in the circumferential direction of the circumferential edge and which are delimited on both sides in the circumferential direction of the circumferential edge by non-recessed areas of the groove base. As a result, a first depression, which is arranged closer to the feed opening, can be filled with lubricant and then a second depression, which is further away from the feed opening than the first, can be filled with lubricant starting from the first depression. This allows lubricant to be transported gradually from one depression to another. This enables the guide groove of the guide rail to be lubricated in areas of the guide groove that are far from the feed opening. The non-recessed areas of the groove base have the effect that a certain amount of lubricant initially collects in a recess before excess lubricant continues to run over an un-recessed area. In this way, even in areas in which depressions with a curved groove base are arranged, the lubricant can be prevented from draining out of a depression in the direction of an un-depressed area. As a result of the interaction of depressions and recessed areas, lubricant reservoirs are formed in the recessed areas. The lubricant can be transported from one lubricant reservoir to the next.

A maximum groove depth measured perpendicular to the circumferential edge from the circumferential edge in the area of the groove side wall to the groove base in the area of the recess is expediently at least 110%, in particular at least 125%, perpendicular to the circumferential edge from the circumferential edge in the area of the groove side wall to the groove base, measured groove depth in a non-recessed area of the groove base. This means that the recess is deep enough to serve as a lubricant reservoir.

Advantageously, the maximum groove depth in the region of the recess is a maximum of 160%, in particular a maximum of 140%, preferably a maximum of 135% of the groove depth in a non-recessed region of the groove base. This allows the recess to be designed so that it fills quickly with lubricant. If lubricant leaks out of the recess, the volume of the lubricant leaking out of the recess can thereby be limited. For example, when a working device provided with the guide rail is parked, only a small amount of lubricant can run out of 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 can be accommodated in it to lubricate the guide groove.

The recess expediently has a largely constant groove depth over at least 50% of the recess length. This means that the greatest value for the groove depth and the smallest value for the groove depth in a contiguous area of the recess with a length of at least 50% of the recess length do not differ from one another by more than 3%.

The recess 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 groove depth increases continuously in the area of the inlet slope. In the area of the discharge slope, the groove depth decreases continuously in the conveying direction. As a result, the depression can easily be filled with lubricant and the lubricant can easily be conveyed out of the depression. The direction of conveyance corresponds to the direction of rotation of the edge of the base support.

A total depression length which corresponds to the sum of the depression lengths of all successive depressions in the central section in a side view of the guide rail on exactly one of the two sides of the longitudinal center axis is advantageously at least 15%, in particular at least 20% of the length of the central 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, a region length, measured in the direction of the longitudinal axis, of the non-recessed region delimited by two recesses is from 1.0% to 3.0% of the length of the central section of the guide rail measured in the direction of the longitudinal central 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 in order to ensure sufficient lubrication and that at the same time there is sufficient space for the arrangement of recesses.

The area length of the non-recessed area is advantageously less than 100%, in particular less than 50%, preferably less than 30% of the recess length. As a result, the non-recessed area can be designed in such a way that it is adequately supplied with lubricant from adjacent recesses. The area length of the non-recessed area is expediently greater than the 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 particular, the area length of the non-recessed area is a maximum of three times as large as that 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 groove base runs in the non-recessed area of the central section at a constant distance from the circumferential edge of the base support. The term “constant” in this context 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 protruding over the intermediate plate side plates. As a result, the guide rail can be produced 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 several 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 in the central plane run transversely to the longitudinal center axis, and that in a side view of the guide rail on opposite sides of the longitudinal center axis the webs connect non-recessed areas of the groove base with one another. As a result, the guide rail can be designed to be weight-saving and yet stable. The non-recessed areas, which are connected by a web, are preferably located opposite one another. The non-recessed areas are preferably arranged at least in the central section mirror-symmetrically to a mirror plane which contains the longitudinal central axis and is perpendicular to the central plane. The webs advantageously run perpendicular to this mirror plane.

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

The implement according to the invention comprises the guide bar according to the invention and a saw chain. The saw chain is arranged and tensioned in the guide groove around the base support, the saw chain comprising drive links, and each drive link being at a distance from the groove base in the tensioned state of the chain. Accordingly, the saw chain does not come into contact with the non-recessed areas of the groove base during operation. Cutting chips that have accumulated in the recess, such as wood chips for example, can be used for the intermediate storage of lubricant. The drive links can be lubricated by contact with such cutting chips soaked with lubricant. Such a contact also enables lubricant to be transported by means of the drive links into regions of the guide groove that are remote from the depression during one revolution of the saw chain. A transport of the lubricant starting 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 exemplary embodiment of the invention is explained below with reference to the drawing. Show it:

Fig. 1

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

Figures 2 and 3

perspective representations of a guide rail,

Fig. 4

a side view of the guide rail according to Fig. 3 ,

Fig. 5

a side view of the guide rail Fig. 2 ,

Fig. 6

a distorted sectional view along the line VI-VI, which is not true to scale Fig. 5 ,

Fig. 7

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

Fig. 8

an exploded view of the guide rail Fig. 3 ,

Fig. 9

a side view of a side plate of the guide rail according to Fig. 8 ,

Fig. 10

a side view of an intermediate plate of the guide rail according to Fig. 8 ,

Fig. 11

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

Fig. 12

a perspective view of the guide rail according to Fig. 3 without cover plate,

Fig. 13

a side view of the guide rail according to Fig. 12 ,

Fig. 14

a side view of the guide rail according to Fig. 2 , with hidden components shown in dashed lines,

Fig. 15

a section, enlarged representation of the detail XV Fig. 14 ,

Fig. 16

a side view of the guide rail according to Fig. 2 with a saw chain tensioned on it,

Fig. 17

a partial, enlarged representation of the detail XVII Fig. 16 .

Fig. 1 shows a hand-held tool 110 with a guide rail 1. In the exemplary embodiment, the hand-held tool 110 is a motorized chain saw. When the hand-held work device 110 is in operation, a saw chain 101 revolves around the guide bar 1. The saw chain 101 is driven to rotate by a drive motor, not shown, of the implement 110.

Fig. 2 shows a perspective view of the guide rail 1. In the exemplary embodiment, the guide rail 1 has a sprocket 8. The guide bar 1 comprises a base support 5. The base support 5 has a circumferential edge 6. A guide groove 60 runs in the circumferential edge 6. The guide groove 60 serves to accommodate the saw chain 101 .

Fig. 3 shows the guide rail 1 from Fig. 2 without sprocket.

Fig. 4 shows the guide rail 1 from Fig. 3 in a side view. The guide rail 1 extends along a longitudinal central axis 100 over a longitudinal extent 7. The guide rail 1 extends in a central plane M. The central plane M runs parallel to the plane of the flat 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 bar 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 extension 7 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 extension 7. In the rear section 3 of the guide rail 1 a supply opening 41 for supplying lubricant is arranged in the guide groove 60. The feed opening 41 opens into the guide groove 60. In the exemplary embodiment, the guide rail 1 can be turned around the longitudinal center axis 100, and a feed opening 41, 42 is arranged on both sides 11, 12. The lubricant is supplied via the in Fig. 9 illustrated feed opening 42, which is arranged on the first side 11 of the central plane M.

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

Fig. 6 FIG. 13 shows a distorted representation, not to scale, of a section along the line in FIG Fig. 5 drawn section line VI-VI. The illustration is greatly enlarged in a transverse direction 50. The transverse direction 50 runs perpendicular to the longitudinal center axis 100. As in FIG Fig. 4 shown, the transverse direction 50 runs perpendicular to the center plane M.

The guide groove 60 is formed by a groove base 63, a first groove side wall 61 and a second groove side wall 62 ( Fig. 6 ) limited. The first groove side wall 61 and the second groove side wall 62 lie opposite one another with respect to the transverse direction 50.

Fig. 7 FIG. 8 shows a distorted representation, not to scale, of a view of the guide rail 1 in the direction of the arrow VII in FIG Fig. 4 . The illustration is only greatly enlarged in the transverse direction 50 and not in the direction of the longitudinal center axis 100. In this view perpendicular to the longitudinal center axis 100 and perpendicular to the transverse direction 50, the groove base 63 can be seen in the central section 2 of the guide rail 1.

From the synopsis of the Figures 6 and 7th the result is that the groove base 63 in the middle section 2 for receiving lubricant has at least one depression 64, 65, 66 opposite a directly adjacent, non-recessed area 67, 68 of the groove base 63. In the middle section 2, the groove base 63 has at least two recesses 64, 65, 66 spaced apart from one another in the direction of rotation 70 of the peripheral edge 6. 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 Fig. 4 As shown, the direction of rotation 70 on the first side 11 of the central plane M runs 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 central plane M, the direction of rotation 70 runs in the direction from the front section 4 to the rear section 3 of the guide rail 1.

In the exemplary embodiment, the at least two recesses 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 non-recessed areas 67, 68 of the groove base 63. This is in Fig. 7 for the recess 65 shown. In the middle section 2 of the guide rail 1, the groove base 63 is a closed surface. The groove base 63 is free of feed openings for the feed of lubricant in the middle section 2. In the middle section 2, the groove base 63 also has no other openings. The entire groove base 63 in the middle section 2 of the guide rail is a continuously uninterrupted surface. This does not preclude the groove base 63 from having abutting or joining edges at which adjacent components delimiting the groove base 63 abut one another.

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

As in Fig. 6 As shown, the guide groove 60 in the area of the recess 64, 65, 66 has a maximum groove depth t2 measured perpendicular to the circumferential edge 6 from the circumferential edge 6 in the area of the groove side wall 61, 62 to the groove base 63. In the non-recessed area 67, 68 of the groove base 63, the guide groove has a groove depth t1 measured perpendicular to the circumferential edge 6 from the circumferential 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 recess 64, 65, 66 is at least 110% of the groove depth t1 in the non-recessed area 67, 68 of the groove base 63. In the exemplary embodiment, the maximum groove depth t2 in the area of the recess 64, 65, 66 is at least 125% Groove depth t1 in the non-recessed area 67, 68 of the groove base 63.

The maximum groove depth t2 in the area of the recess 64, 65, 66 is a maximum of 160% of the groove depth t1 in the non-recessed area 67, 68 of the groove base 63. In the embodiment, the maximum groove depth t2 in the area of the recess 64, 65, 66 is a maximum of 140% Groove depth t1 in the non-recessed area 67, 68 of the groove base 63.

Fig. 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 Fig. 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 results that in the assembled state of the guide rail 1 the cover plates 31, 32 are received in the recess 56 of the side plates 51, 52. The cover plates 31, 32 lie on opposite sides on the intermediate plate 53. The cover plates 31, 32 completely cover the openings 25, 26, 27 in the intermediate plate 53. Each cover plate 31, 32 covers all openings 25, 26 and 27 in the intermediate plate 53. The intermediate plate 53 is arranged in the transverse direction 50 between the first cover plate 31 and the second cover plate 32.

Fig. 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. The recess 56 is an opening in the side plate 51, 52 which 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 feed opening 42. The feed opening 41, 42 is an opening which 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 so that the first feed opening 41 is on the second side 12 of the central plane M and the second feed opening 42 is on the first side 11 of the central plane M. Through the feed opening 41, 42 of the Guide groove 60 are supplied with lubricant. In the exemplary embodiment, the lubricant is oil.

Fig. 10 shows the intermediate plate 53. The intermediate plate 53 has openings 25, 26 and 27, of which in FIG Fig. 10 three openings are indicated by way of example. The openings 25, 26, 27 penetrate the intermediate plate 53 completely 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. This is for example in Fig. 12 shown.

Fig. 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 FIG Figures 3 and 8th but without the cover plates 31 and 32 and without the first side plate 51. Fig. 11 shows a side view of the arrangement with a view of the intermediate plate 53 arranged on the second side plate 52 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 arranged on the circumferential side of the intermediate plate 53. The edge of the intermediate plate 53 runs around the intermediate plate 53 in the direction of rotation 70. The second groove side wall 62 of the guide groove 60 is formed by the second side plate 52 protruding beyond the intermediate plate 53 in the direction away from the longitudinal center axis 100. As in Fig. 6 As shown, the first groove side wall 61 of the guide groove 60 is formed by the first side plate 51 protruding over the intermediate plate 53 in the direction away from the longitudinal center axis 100.

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

The rear section 3 of the guide rail 1 has a length 13 measured in the direction of the central longitudinal axis 100. The central section 2 of the guide rail 1 has a length 12 measured in the central longitudinal axis 100. The front section 4 of the guide rail 1 has a length measured in the central longitudinal axis 100 14. The length 12 of the middle section 2 is half the length 1 of the guide rail 1. The length 13 of the rear section 3 and the length 14 of the front section 4 of the guide rail 1 are each a quarter of the length 1 of the guide rail 1. The longitudinal extension 7 of the guide rail 1 extends over the entire length 1 of the guide rail 1.

In the middle section 2 of the guide rail 1, the groove base 63 has at least one recess 64, 65, 66 on both sides 11, 12 of the central plane M divided by the longitudinal center axis 100, compared to the immediately adjacent unrecessed 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 middle section 2 of the guide rail 1 on the first side 11 of the middle plane M, three of which are indicated by way of example. Likewise, seven complete depressions are arranged in the groove base 63 on the second side 12 of the center plane M in the center section 2 of the guide rail 1.

The depressions are delimited on both sides in the direction of rotation 70 by a non-recessed area of the groove base 63 of the guide groove 60. An example is in Fig. 11 denotes the recess 65, which is delimited in the circumferential direction 70 by the non-recessed area 67 and by the non-recessed area 68.

The groove base 63 has, on the second side 12 of the center plane M, in the center section 2 of the guide rail, areas 77, 78 which are not recessed. The non-recessed area 77 lies opposite the non-recessed area 67 in the direction perpendicular to the longitudinal center axis 100 with respect to the longitudinal center axis 100. The non-recessed area 78 lies opposite the non-recessed area 68 in the direction perpendicular to the longitudinal center axis 100 with respect to the longitudinal center axis 100.

The depression 65 has a depression length v2 measured in the direction of the longitudinal center axis 100. The recess 64 has a recess length v1 and the recess 66 has a recess length v3. The recess length v1, v2, v3 is each at least 6% of the length 12 of the middle section 2 of the guide rail. In the exemplary embodiment, the recess length v1, v2, v3 is in each case at least 8% of the length 12 of the central 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 the depressions in the groove base 63 on the first side 11 of the central plane M in the central section 2 of the guide rail 1, is at least 15%, in particular at least 20%, preferably at least 30% of the Length 12 of the middle section 2 of the guide rail. In the exemplary embodiment, the sum of the recess lengths of all recesses on the first side 11 of the central plane M in the central section 2 of the guide rail 1 is at least 40% of the length 12 of the central section 2 of the guide rail 1. It can also be provided that the sum of the recess lengths of all Depressions on the first side 11 of the central plane M in the central section 2 of the guide rail 1 is at least 50% of the length 12 of the central section 2 of the guide rail 1. All values mentioned for the sum of the recess lengths of all recesses on the first side 11 of the central plane M in the middle section 2 of the guide rail 1 also apply to the sum of the recess lengths of all the recesses in the groove base 63 on the second side 12 of the central plane M in the central section 2 of the Guide rail 1 in an analogous manner.

As in Fig. 11 As shown, the non-recessed area 67 delimited by two depressions 64 and 65 has an area length b measured in the direction of the longitudinal center axis 100. The non-recessed area 68 delimited by the two recesses 65 and 66 likewise has an area length b measured in the direction of the longitudinal center axis 100. The area length b of the non-recessed area 67, 68 is in each case from 1.0% to 3.0% of the length 12 of the middle section 2 of the guide rail 1, measured in the direction of the longitudinal center axis.

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

Fig. 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 center axis 100, of which in FIG Fig. 12 three are designated by way of example. 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, which is shown in FIG Fig. 12 Not shown recess 56 in the second side plate 52 and formed by the opening 25 in the intermediate plate 53. 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 Fig. 13 As shown, the webs 23, 24 run transversely in the central plane M, in particular approximately perpendicular to the longitudinal central axis 100.

As can be seen from the synopsis of the Figures 5 , 6th and 12th 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 the web 23, are fluidically connected to one another despite the connection. A fluid can flow from one opening 25 to the other opening 26 via the space between the web 23 and the cover plate 31, 32.

As in Fig. 10 shown, the webs 23, 24 connect to one another 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. This is also in Fig. 11 shown. The web 24 connects the non-recessed area 68 on the first side of the central plane M with the non-recessed area 78 on the second side of the central plane M. The web 23 connects the non-recessed area 67 on the first side of the central plane M with the non-recessed area 77 on the second side of the median plane M, like Fig. 10 shows.

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

Fig. 14 shows a schematic side view of the guide rail 1. In this view, components of the guide rail 1 which 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 direction of rotation 70. 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 Side plate 51 protrudes.

Fig. 15 shows a detail Fig. 14 . The circumferential edge 6 of the base support 5 has a minimum distance measured perpendicular to the circumferential 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 circumferential edge 6 of the base support 5 by an overlap width s of at least 20% of the minimum distance min.

As in Fig. 14 As shown, the first side plate 51 has protrusions 58. In an analogous manner, the second side plate 52 has projections 58. 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 center axis 100. The non-recessed areas 67, 68 of the groove base 63 of the intermediate plate 53 are arranged in the circumferential direction 70 in the same areas as the projections 58 of the side plate 51, 52. The projections 58 of the side plate 51, 52 are arranged in the circumferential direction 70 in the same areas as the thickenings 54 of the webs 23, 24 of the intermediate plate 53. The thickenings 54 of the intermediate plate 53 overlap the projections 58 of the side plate 51, 52. The thickenings 54 of the webs 23, 24 of the intermediate plate 53 protrude in the direction of the longitudinal center axis 100 over the projections 58 of the side plate 51, 52.

The projections 58 of the side plate 51, 52 are connected to the intermediate plate in the area of the thickenings 54 of the webs 23, 24 of the intermediate plate 53. The intermediate plate 53 and the side plate 51, 52 are made of metal. The intermediate plate 53 and the side plate 51, 52 are connected to one another via weld points. 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 welding points are arranged at the unrecessed areas 67, 68.

As in Fig. 15 As shown, the groove base 63 in the non-recessed area 67, 68 of the central section 2 has a distance a1 from the circumferential edge 6 of the base carrier 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 non-recessed area 67 .68 in constant spacing a1 from the circumferential edge 6. In the present case, the term “constant” refers to a constant value within the framework of customary manufacturing tolerances and includes a range with a deviation of +/- 3% from a target value.

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

The recess length v2 is at least twice, in the exemplary embodiment at least three times as large as the maximum groove depth t2. The same applies to the recess lengths v1 and v3. The area length b of the non-recessed area 67, 68 is a maximum of three times as great as the difference depth Δt. The recess lengths v1, v2, v3 of all recesses 64, 65, 66 of the guide rail 1 in the central section 2 are advantageously at least twice, preferably at least three times as large as 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 difference depth Δt. The same applies to the recess lengths v1 and v3.

The region length b of the non-recessed region 67, 68 is less than 100%, in particular less than 50% of the recess length v2 of the recess 65. The same also applies to the recess length v1 of the recess 64 and the recess length v3 of the recess 66.

The recess 64, 65, 66 has an inlet slope 73 and an outlet slope 74. The groove depth measured perpendicular 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 run-in bevel 73 increases in the circumferential direction 70 starting from the non-recessed area 67, 68 to the area of the recess 65 with a maximum groove depth t2. The groove depth decreases in the area of the run-out bevel 74 in the circumferential direction 70, starting from the area of the recess 65 with the maximum groove depth t2 up to the non-recessed area 68.

The recess 65 has a largely constant groove depth over at least 50% of the recess length v2. The groove depth, which is largely constant in this area, corresponds to the maximum groove depth t2. In this context, largely constant means that the groove depth does not deviate from a target value by more than +/- 3%.

The synopsis of the Figures 12 and 14 shows that the circumferential edge 6 of the base support 5 in the middle section 2 of the guide rail 1 in the area of the groove side walls 61, 62 is designed without recesses in the direction perpendicular to the edge 6. The circumferential 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 groove base 63 has a profile in the form of the depressions 64, 65, 66.

the Figures 11 and 14th show elevations 75 of the groove base 63. One of the two elevations 75 lies in front of the first feed opening 41 in the circumferential direction 70, and the other of the two elevations 75 lies in the circumferential direction 70 behind the first feed opening 41. Between the elevations 75 is a reservoir for the accumulation of lubricant formed, which reaches the guide groove 60 via the feed opening 41. The elevations 75 protrude in the direction away from the longitudinal center axis 100 beyond the normal level 80. With respect to the normal level 80, the elevations represent 75 Elevations of the groove base 63 represent. The elevations 75 are arranged in the rear section 3. In the middle section 2 of the guide rail 1, however, there is no elevation of the groove base 63 above the normal level 80.

Fig. 16 shows the guide bar 1 with the saw chain 101 arranged on the guide bar 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) from FIG Fig. 1 working device 110 shown.

Fig. 17 shows an enlarged detailed representation of the in Fig. 16 area marked with XVII. The saw chain 101 consists of drive links 102 which are central with respect to the transverse direction 50 and which are connected to one another via lateral connecting links 103. The connecting links 103 are partially designed as right cutting links 104 or left cutting links 105. The connecting links 103 and the drive 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 circumferential 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 center axis 101. There is a distance a between each drive link 102 and the groove base 63. This applies in particular in the middle section 2 of the guide rail 1. The saw chain 101 is guided through the guide groove 60 without contact with respect to the groove base 63. In particular, the extensions 107 of the drive links 102 of the saw chain 101 have no contact with the groove base 63.

Claims (18)

Guide bar for guiding a saw chain (101) in a guide groove (60) of the guide bar (1), the guide bar (1) extending along a central longitudinal axis (100) over a longitudinal extension (7) and a rear section (3) for fixing the Guide bar (1) on an implement (110), a front section (4) for deflecting the saw chain (101) and a middle section (2) arranged between the rear section (3) and the front section (4), wherein the middle section (2) extends over half of the longitudinal extension (7) between the rear section (3) and the front section (4), the rear section (3) and the front section (4) each extending over a quarter of the Longitudinal extension (7), the guide rail (1) comprising a base support (5), the base support (5) having a circumferential edge (6), the guide groove (60) with a groove base (63) in the circumferential edge (6) ) and two groove sides n walls (61, 62), and wherein in the rear section (3) at least one feed opening (41, 42) for the feed of lubricant is arranged, which opens into the guide groove (60),
characterized in that the groove base (63) in the middle section (2) for receiving lubricant has at least one recess (64, 65, 66) opposite an immediately adjacent, non-recessed area (67, 68) of the groove base (63), and that the Groove base (63) in the middle section (2) is free of feed openings for the feed of lubricant. Guide rail according to claim 1,
characterized in that the groove base (63) in the middle section (2) has at least two recesses (64, 65, 66) spaced from one another in the direction of rotation (70) of the circumferential edge (6), and that the recesses (64, 65, 66 ) are delimited on both sides in the circumferential direction (70) of the circumferential edge (6) by non-recessed areas (67, 68) of the groove base (63). Guide rail according to claim 1 or 2,
characterized in that the guide groove (60) has a groove depth (t1, t2) measured perpendicular to the circumferential edge (6) from the circumferential edge (6) in the region of the groove side wall (61, 62) to the groove base (63), and that the The maximum groove depth (t2) in the area of the recess (64, 65, 66) is at least 110% of the groove depth (t1) in an un-recessed area (67, 68) of the groove base (63). Guide rail according to one of Claims 1 to 3,
characterized in that the maximum groove depth (t2) in the region of the recess (64, 65, 66) is a maximum of 160% of the groove depth (t1) in a non-recessed region (67, 68) of the groove base (63). Guide rail according to one of Claims 1 to 4,
characterized in that the recess (64, 65, 66) has a recess length (v1, v2, v3) measured in the direction of the longitudinal axis (100), and that the recess length (v1, v2, v3) is at least 6% of a length in the direction of the Longitudinal central axis (100) measured length (12) of the central section (2) of the guide rail (1). 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). Guide rail according to claim 5 or 6,
characterized in that the recess length (v1, v2, v3) is greater than 100% of the maximum groove depth (t2). Guide rail according to one of Claims 5 to 7,
characterized in that the recess (64, 65, 66) has an inlet slope (73) and an outlet slope (74). Guide rail according to one of Claims 1 to 8,
characterized in that a total depression length, which is the sum of the depression lengths (v1, v2, v3) of all successive depressions (64, 65, 66) in the middle section (2) in a side view of the guide rail (1) on exactly one of the two sides (11, 12) corresponds to the longitudinal center axis (100), is at least 15% of the length (12) of the central section (2) of the guide rail (1). Guide rail according to one of Claims 2 to 9,
characterized in that the non-recessed area (67, 68) bounded by two depressions (64, 65, 66) has an area length (b) measured in the direction of the longitudinal axis (100), and that the area length (b) is 1.0 % to 3.0% of the length (12) of the central section (2) of the guide rail (1) measured in the direction of the longitudinal center axis (100). Guide rail according to one of Claims 2 to 10,
characterized in that the region length (b) of the non-recessed region (67, 68) is less than 100% of the recess length (v1, v2, v3). Guide rail according to one of Claims 2 to 11,
characterized in that the area length (b) of the non-recessed area (67, 68) is greater than the difference between the maximum groove depth (t2) in the area of the recess (64, 65, 66) and the groove depth (t1) in a non-recessed area (67, 68) of the groove base (63). Guide rail according to one of Claims 2 to 12,
characterized in that the area length (b) of the non-recessed area (67, 68) is a maximum of three times as great as the difference between the maximum groove depth (t2) in the area of the recess (64, 65, 66) and the groove depth (t1) in a recessed area (67, 68) of the groove base (63). Guide rail according to one of Claims 1 to 13,
characterized in that the groove base (63) runs in the non-recessed area (67, 68) of the central section (2) at a constant distance (a1) from the circumferential edge (6) of the base support (5). 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, that the side plates (51, 52) and the intermediate plate (53) form the base support (5) that the groove base (63) of the guide groove (60) is formed by an edge of the intermediate plate (53), and that the groove side walls (61, 62) of the guide groove (60) from the side plates (51, 52) protruding beyond the intermediate plate (53) are formed. Guide rail according to claim 15,
characterized in that the guide rail (1) extends in a central plane (M) along the longitudinal central axis (100), that the intermediate plate (53) completely penetrates the intermediate plate (53) in a transverse direction (50) perpendicular to the central plane (M) Openings (25, 26, 27) has that the openings (25, 26, 27) are separated from one another by webs (23, 24), that the webs (23, 24) in the central plane (M) transversely to the longitudinal center axis (100 ) extend, and that the webs (23, 24) connect non-recessed areas (67, 68, 77, 78) of the groove base (63) arranged on opposite sides (11, 12) of the longitudinal center axis (100). Guide rail according to claim 16,
characterized in that the webs (23, 24) in the area of their connection with the non-recessed areas (67, 68, 77, 78) in the circumferential direction (70) have thickenings (54), and that the side plate (51, 52) in the area of the thickenings (54) is connected to the intermediate plate (53). Tool comprising a guide bar according to one of claims 1 to 17 and a saw chain, the saw chain (101) being arranged and tensioned in the guide groove (60) around the base support (5), the saw chain (101) comprising drive links (102) , and wherein in the tensioned state of the chain between each drive link (102) and the groove base (63) there is a distance (a).

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