saw chain

Abstract

This invention relates to a saw chain comprising a connecting link and a driving link, which are hingedly connected to each other about a rivet bolt axis by means of a rivet bolt. The rivet bolt protrudes through at least one rivet opening in at least one connecting link and a rivet opening in the driving link. At least one rivet bolt has a notch at at least one end side, having a notch edge and a notch bottom. The distance between the notch edge and the midplane of the saw chain increases with increasing radial distance relative to the rivet bolt axis. The notch edge surrounds the notch bottom. The distance between the notch bottom and the midplane of the saw chain does not increase at any point on the notch bottom with increasing radial distance relative to the rivet bolt axis. The maximum distance between the notch bottom and the rivet bolt axis corresponds to 50% to 100% of half the core diameter of the rivet bolt. The saw chain is configured such that the rivet bolt is constructed as a solid body and has a first end side and a second end side, which are constructed differently.

Description

Technical Field

[0001] This invention relates to a saw chain. Background Technology

[0002] DE 43 09 464 A1 discloses a saw chain in which the rivet has notches at both ends. The notches are constructed with a continuous and relatively large radius. Consequently, the frictional pressure in the hole between the rivet shaft and the rivet hole should increase because an increased radial pressure is built into the rivet shaft during deformation. Summary of the Invention

[0003] Based on the following objective, this invention provides a saw chain of this type that has a long service life.

[0004] This task is solved by a saw chain comprising connecting links and drive links, which are hinged to each other around the axis of a rivet bolt, wherein the rivet bolt protrudes through at least one rivet opening of at least one connecting link and a rivet opening of the drive link disposed between two connecting links, wherein the saw chain has a central plane perpendicular to the axis of the rivet bolt and extending through the drive link in the middle, wherein the connecting link is partially constructed as a cutting link and has a cutting section, wherein at least one rivet bolt has a notch at at least one end side, wherein the notch has a notch edge, wherein the distance between the notch edge and the central plane of the saw chain increases with increasing radial distance relative to the axis of the rivet bolt, wherein the notch has a notch bottom surrounded by the notch edge, wherein the distance between the notch bottom and the central plane of the saw chain does not increase at any point on the notch bottom with increasing radial distance relative to the axis of the rivet bolt, and wherein the maximum distance between the notch bottom and the axis of the rivet bolt corresponds to 30% to 100% of half the core diameter (Kerndurchmesser, sometimes called inner diameter) of the rivet bolt.

[0005] The task is also solved by a saw chain comprising connecting links and driving links, which are hinged to each other about the axis of the rivet bolts by means of rivet bolts, wherein the rivet bolts protrude through at least one rivet opening of at least one connecting link and a rivet opening of the driving link disposed between the two connecting links, wherein the saw chain has a central plane perpendicular to the axis of the rivet bolts and extending through the driving link in the middle, wherein the connecting links are partially constructed as cutting links and have cutting sections, wherein at least one rivet bolt has a notch at at least one end side, wherein the rivet bolt is constructed as a solid body and has a first end side and a second end side, which are constructed differently.

[0006] It has been confirmed that excessive radial pressure at the rivet bolts can lead to a reduced lifespan of the saw chain.

[0007] According to the invention, the notch has a notch edge whose distance from the midplane of the saw chain increases with increasing radial distance relative to the rivet bolt axis. The notch further has a notch bottom surrounded by the notch edge, wherein the distance between the notch bottom and the midplane of the saw chain does not increase at any point on the notch bottom with increasing radial distance relative to the rivet bolt axis. The maximum distance of the notch bottom relative to the rivet bolt axis corresponds to 30% to 100% of half the core diameter of the rivet bolt.

[0008] It has been confirmed that the given design reduces the radial force acting on the openings in adjacent connection links, thus simultaneously achieving greater riveting strength. Since the distance between the bottom of the notch and the mid-plane of the saw chain does not increase at any point on the bottom of the notch with increasing radial spacing relative to the bolt axis, only a relatively small radial force is introduced into the openings of the connection links during riveting in the region at the bottom of the notch. The riveted parts are compressed in the region surrounding the bolt axis, which is covered by the bottom of the notch when viewed along the bolt axis. This results in higher riveting force.

[0009] Half the core diameter is the minimum radius of a rivet bolt with a circular cross-section. In a rivet bolt with a flange (Bund) in the drive link, half the core diameter corresponds to the radius of the rivet bolt in the connection link.

[0010] The rivet bolt can be constructed separately from the two connecting links and the drive link, and the rivet bolt hinges them together. In this case, the rivet bolt protrudes through the riveting openings of the two connecting links and the riveting opening of the drive link disposed between the connecting links. In an alternative embodiment, the rivet bolt can be constructed as a single piece with the connecting links and protrudes through the riveting opening of the drive link and the riveting opening of the opposite connecting link. A notch is advantageously arranged on the side of the rivet bolt, where the rivet bolt protrudes through the riveting opening of the connecting link and engages with the connecting link.

[0011] The maximum distance between the bottom of the notch and the axis of the rivet bolt advantageously corresponds to at least 50% of half the core diameter of the rivet bolt. By giving the minimum size of the bottom of the notch, the force introduced into the bottom of the notch can be limited during riveting and thus avoids excessive material load.

[0012] In a particularly advantageous design, the bottom of the notch is constructed with a convex, arched shape. Thus, in the region at the bottom of the notch, the force applied during riveting is directed away from the edge of the opening of the adjacent connecting link and deflected in a direction toward the axis of the rivet bolt. Similarly, it is advantageous for the bottom of the notch to extend at least partially, and especially completely, perpendicular to the axis of the rivet bolt.

[0013] Advantageously, the maximum distance between the bottom of the notch and the axis of the rivet corresponds to a maximum of 80% of half the core diameter of the rivet.

[0014] The maximum distance between the notch and the rivet bolt axis advantageously corresponds to at least 110% of the maximum distance between the bottom of the notch and the rivet bolt axis. This achieves a relatively small rise in the region of the notch edge, i.e., a small increase in the distance between the notch edge and the intermediate plane with increasing distance relative to the rivet bolt axis. This relatively small rise in the region of the notch edge is responsible for the appropriate force introduction.

[0015] The depth of the notch is preferably relatively small. The depth of the notch is measured parallel to the axis of the rivet bolt. The depth of the notch is the difference between the maximum distance between the edge of the notch and the center plane and the minimum distance between the bottom of the notch and the center plane. The depth of the notch is advantageously less than the maximum distance between the bottom of the notch and the axis of the rivet bolt. The depth of the notch is particularly less than 40% of the maximum distance between the bottom of the notch and the axis of the rivet bolt, and advantageously less than 30%. The notch is advantageously constructed relative to the flat ground.

[0016] At least one end of the rivet is advantageously constructed at the rivet joint with an increased outer diameter, protruding beyond the associated connecting link. The notch is particularly at least partially outside the plane of the associated connecting link. Preferably, the notch is completely outside the plane of the associated connecting link. The associated connecting link is a connecting link arranged on the same chain side as the rivet joint. The rivet joint is particularly abutted against the associated connecting link. In an alternative embodiment, the end of the rivet may be arranged flush with or offset relative to the outside towards the mid-plane of the saw chain. The depth of the notch is particularly less than the height of the rivet joint measured along the rivet's axis. The depth of the notch is particularly less than 50% of the height of the rivet joint, advantageously less than 30%.

[0017] Advantageously, the ratio of half of the increased outer diameter of the rivet joint to the maximum distance between the bottom of the notch and the axis of the rivet bolt is 1.5 to 3.5. Particularly advantageously, the ratio of half of the increased outer diameter of the rivet joint to the maximum distance between the bottom of the notch and the axis of the rivet bolt is 2 to 3.5.

[0018] The connecting link advantageously has a chamfer at the riveting opening. The chamfer is particularly located on the outer side of the riveting opening, i.e., on the side of the riveting opening away from the intermediate plane. The depth of the chamfer at the riveting opening of the connecting link is advantageously relatively small. The depth of the chamfer at the riveting opening is advantageously at most 30%, and particularly at most 20%, of the thickness of the connecting link. Therefore, the maximum diameter of the chamfer located on the outer side of the connecting link is also relatively small. For rivets with rivets, it is advantageously configured such that the rivet completely covers the chamfer. The increased outer diameter of the rivet is advantageously at least 120% of the maximum diameter of the chamfer. The maximum distance from the bottom of the notch to the axis of the rivet is advantageously at least 20%, and particularly at least 40%, of half the maximum diameter of the chamfer.

[0019] The rivet bolt is advantageously a flange bolt. The rivet bolt advantageously has a flange arranged in the riveting opening of the drive link. The flange advantageously does not protrude into the riveting opening of the connecting link. Sufficient spacing between the two connecting links through which the flange bolt protrudes can be ensured in a simple manner via the flange bolt.

[0020] The independent inventive concept involves the design of the two ends of a rivet bolt. The rivet bolt is advantageously constructed as a solid body and has first and second ends, which are configured differently. By having rivet bolts with different first and second ends, the different forces acting on the two ends of the rivet bolt, or other effects on the riveting acting differently on the two ends of the rivet bolt, can be at least partially balanced. In particular, it has been demonstrated that the forces acting on the saw chain during operation can be different on both sides of the saw chain, for example, due to the arrangement of the drive unit or handle, via which forces are introduced during operation. Similarly, lateral forces are introduced into the saw chain via the cutting links, which can lead to asymmetrical loads on the saw chain in the respective cutting link areas. It has been demonstrated that a longer service life of the saw chain can be achieved by designing the different ends of the rivet bolt.

[0021] Advantageously, the second end has a notch, while the first end does not. However, it is also possible to configure the two end sides to have notches with different designs.

[0022] Advantageously, the first end face is constructed at the first rivet joint and the second end face is constructed at the second rivet joint. The rivet joints here advantageously protrude beyond the outer surface of the associated connecting link. The height of the second rivet joint, measured along the bolt axis, is advantageously greater than the height of the first rivet joint, measured along the bolt axis. The two rivet joints thus have different heights in an advantageous design. The height of the rivet joint is measured with respect to the plane of the outer surface of the associated connecting link. Particularly advantageously, the second rivet joint with the greater height is a rivet joint with a notch on its end face, and the first rivet joint is a rivet joint with a smaller height that does not have a notch.

[0023] In the preferred design, the first end protrudes outwards.

[0024] In an advantageous design, the bend in the diameter region at the bottom of the notch on the first end side is mirror-symmetrical to the bend in the same diameter region at the bottom of the notch on the second end side. Thus, in the diameter region at the bottom of the notch located on the end side, similar or nearly identical forces are introduced into the rivet bolt at both end sides.

[0025] The difference between the distance between the first end side at the intersection of the rivet bolt axis and the first end side and the intermediate plane, and the distance between the second end side at the intersection of the rivet bolt axis and the second end side and the intermediate plane, is advantageously less than 0.3 mm. The distances are preferably approximately the same. The difference in distances is particularly less than 0.1 mm. Particularly preferably, the distances are the same size within manufacturing tolerances. The midpoints of the end sides of the riveted piece advantageously have approximately the same distance relative to the intermediate plane.

[0026] Advantageously, all end sides on the chain side of the saw chain are first end sides, and all end sides on the opposite second chain side are second end sides. For saw chains operated by hand-held motor saws, it has proven particularly preferred that the end sides on the right-hand chain side arranged to the right of the direction of travel are first end sides, and the end sides on the left-hand chain side arranged to the left of the direction of travel are second end sides. Attached Figure Description

[0027] Embodiments of the present invention will then be described with reference to the accompanying drawings. Wherein:

[0028] Figure 1 and 2 A perspective view of an embodiment of the saw chain is shown.

[0029] Figure 3 and 4 Showing from Figure 1 and 2 Side view of the saw chain.

[0030] Figure 5 It shows along Figure 3 The cross section of line VV in the middle, and

[0031] Figure 6 The enlarged diagram shows the source Figure 5 Detail VI. Detailed Implementation

[0032] Figure 1 The saw chain 1 is shown in perspective. The saw chain 1 moves along the direction of travel 10 during operation. Figure 1 A view of the chain side 15 facing right is shown. Figure 2A view of the chain side 16 facing the opposite left is shown. The saw chain includes connecting links 2 and drive links 3. Each drive link 3 has a drive assembly 9, which is configured to engage with the guide rail of a power saw. At the drive assembly 9, the saw chain 1 can be driven, for example, via a drive pinion. Each drive link 3 has two riveting openings 12. Riveting bolts 4 protrude through the riveting openings 12, which hinge the drive link 3 to the connecting links 2. Each riveting bolt 3 protrudes through both connecting links 2 and the drive link 3 arranged between the two connecting links 2.

[0033] The connecting link 2 is partially constructed as cutting links 5 and 6. Here, the right-side cutting link 5 is located at the right-side chain side 15, and the left-side cutting link 6 is located at the left-side chain side 16. Figure 2 Cutting segments 5 and 6 each have a cutting section 7. The cutting section 7 may have a geometrically defined or geometrically indeterminate cutting geometry. In an embodiment, the cutting section 7 is configured for cutting workpieces, particularly those made of wood. The cutting section 7 has a geometrically defined cutting geometry. In an alternative embodiment, the cutting section 7 may be configured for grinding workpieces, particularly those made of concrete. The cutting portion of the cutting section 7 may be formed, for example, by a large number of abrasive grains (e.g., made of diamond). In this case, the geometry of the cutting portion is geometrically indeterminate.

[0034] In this embodiment, a depth limiter 8 is arranged forward relative to each cutting segment 7. In this embodiment, the depth limiter 8 and the subsequent cutting segment 7 are arranged at the same cutting links 5, 6.

[0035] The labels "right chain side 15" and "left chain side 16" refer to a view of the saw chain from above toward the cutting section 7, i.e., from the cutting section 7 toward the drive group 9. In this line of sight, along the direction of travel, the right chain side 15 is located on the right and the left chain side 16 is located on the left.

[0036] like Figure 1 and 2 As also shown, along the direction of travel 10, there are pairs of connecting links 2, wherein the connecting links 2 are configured as left-side cutting links 6, and pairs of connecting links 2 without cutting segments, followed by pairs of connecting links 2, wherein the connecting links 2 are configured as right-side cutting links 5. Pairs of connecting links 2 with cutting segments 7 alternate with pairs of connecting links 2 without cutting segments 7 along the direction of travel. Right-side cutting links 5 and left-side cutting links 6 alternate along the direction of travel 10.

[0037] Similarly, another design option for saw chain 1 could be advantageous.

[0038] like Figure 3 and 4 As shown, the saw chain 10 has a longitudinal centerline 17. In the longitudinally extending saw chain 1, the longitudinal centerline 17 extends parallel to the direction of travel 10. Each bolt 4 has a bolt axis 18. The bolt axis 18 corresponds to the swing axis and hinges the connecting link 2 to the drive link 3 arranged therebetween around its bolt 4. If a section of the saw chain 1 extends, all the bolt axes 18 of that extended section of the saw chain 1 intersect the longitudinal centerline 17 of the saw chain 1.

[0039] like Figure 3 As shown, the rivet 4 has an end side 33 on the right chain side 15. In this embodiment, all the rivet 4 end sides 33 on the right chain side 15 are configured without a notch. In this embodiment, the end side 33 is configured at the right rivet head 13.

[0040] like Figure 4 As shown, in this embodiment, the rivet 4 forms a left-side rivet head 14 at the left-side chain side 16. The rivet 4 has a second end side 34 at the left-side chain side 16. In this embodiment, all rivets 4 have a notch 20 at the second end side 34, which will be described in more detail later.

[0041] At rivet joints 13 and 14, the rivet bolt 4 has an increased outer diameter b. Figure 6 Rivet joints 13 and 14 protrude beyond the outer surface 23 of the associated connecting link 2. In an alternative embodiment, one or both rivet joints 13 and 14 may be flush with the outer surface 23 of the associated connecting link 2. Alternatively, one or both rivet joints 13 and 14 may be repositioned to the outer surface 23 of the associated connecting link 2.

[0042] Figure 5 A cross-section passing through rivet 4 is shown. Figure 5 One of the connecting links 2 in the cross-sectional view is the cutting link 5 on the right. The saw chain 1 has a center plane 19. The center plane 19 extends perpendicular to the rivet bolt axis 18 and extends through the drive link 3 in the middle. The center plane 19 is therefore parallel to the plane of the drive link 3. The center plane 19 and the rivet bolt axis 18 intersect along the longitudinal centerline 17 in the extended saw chain 1. Figure 5 As also shown, the connecting links have riveting openings 11. A rivet 4 protrudes through the riveting opening 12 of the drive link 3 and through the riveting openings 11 of the two connecting links 2 arranged on either side of the drive link 3. The riveting opening 11 in the connecting link 2 is smaller than the riveting opening 12 in the drive link 3. The rivet 4 has a flange 24, where the outer diameter of the rivet 4 increases. The flange 24 extends within the riveting opening 12 of the drive link 3. The flange 24 does not protrude into the riveting opening 11 of the adjacent connecting link 2.

[0043] like Figure 6 As shown, the rivet 4 has a core diameter d. The diameter of the rivet opening 11 of the connecting link 2 corresponds, for example, to the core diameter d. In this embodiment, the rivet 4 has a circular cross-section. The rivet 4 is rotationally symmetrical with respect to the rivet axis 18. Similarly, a non-rotationally symmetrical design of the rivet 4, especially a section of the rivet 4, can be advantageous. The rivet 4 has a diameter i at the flange 24. The diameter i is larger than the core diameter d. The diameters of the rivet openings 11 and 12 are coordinated with the core diameter d and the diameter i at the flange 24. The diameter of the rivet opening 11 is smaller than the diameter i at the flange 24, so that the flange 24 cannot protrude into the rivet opening 11 of the connecting link 2.

[0044] like Figure 6 As shown, the rivet 4 is constructed as a solid body. Therefore, the rivet 4 is not a hollow riveting element. The rivet 4 extends through the riveting openings 11 and 12 and, in this embodiment, is constructed separately from the two connecting links 2 and the drive link 3. The rivet 4 is therefore not a riveting element molded at the connecting link 2, i.e., constructed as a single piece therewith. The rivet 4 is formed at both end sides 33 and 34 during the manufacture of the saw chain 1. Thus, the rivet 4 is fixedly connected to the connecting link 2.

[0045] In an alternative embodiment, the rivet 4 is integrally constructed with the connecting link 2 at its first end side 33. The rivet 4 is a single piece constructed with the adjacent connecting link 2 at end side 33. On the opposite side, the rivet 4 protrudes through the riveting opening 11 of the opposite connecting link 2. The connecting link 2 is constructed separately from the rivet 4 and connected to it by a riveting process. A rivet head 14 is arranged on this side of the rivet 4. A notch 20 is arranged at the second end side 34. The notch 20 is provided at the rivet head 14, where the rivet 4 and the connecting link 2, which is constructed separately from the rivet 4, are connected by riveting. The notch 20 is arranged on the side of the rivet 4, where the rivet 4 protrudes through the riveting opening 11 of the connecting link 2. The notch 20 can affect the torsional strength of the rivet 4 in the riveting opening 11 of the connecting link 2. One side of the rivet bolt 4 is constructed as a single piece with the connecting link 2, and the other side of the rivet bolt 4 has a notch 20.

[0046] In this embodiment, the enlarged diameters of the rivet joints 13 and 14 are greater than the core diameter d. The outer surface 23 of the connecting link 11 faces away from the intermediate plane 19. The rivet joints 13 and 14 protrude beyond the outer surface 23 of the respective adjacent connecting links 2. Adjacent to the outer surface 23, each connecting link 2 has a chamfer 25. Alternatively, it can be configured such that only one of the connecting links 2 has a chamfer 25, or the chamfers 25 of the two connecting links 2 are constructed differently. The chamfer 25 adjacent to the outer surface 23 has the largest outer diameter p. The diameter b of the rivet joints 13 and 14 is advantageously larger than the outer diameter p at the chamfer 25. The rivet joints 13 and 14 thus completely cover the riveting opening 11 along the direction of the rivet bolt axis 18. The enlarged outer diameter b of the rivet joints 13, 14 is advantageously at least 120% of the largest diameter p of the chamfer 25.

[0047] The rivet 4 is configured such that at least one end side 33, 34 has a notch 20. In an embodiment, a notch 20 is provided at a second end side 34. The first end side 33 does not have a notch 20. The notch 20 has a notch bottom 21 and a notch edge 22. The notch edge 22 surrounds the notch bottom 21. The rivet shank axis 18 intersects the notch bottom 21. In an embodiment, the notch bottom 21 and the notch edge 22 are constructed rotationally symmetrically about the rivet shank axis 18. However, an asymmetrical design with respect to the rivet shank axis 18 is also possible.

[0048] The bottom 21 of the notch is the region of the notch 20 in which the distance e between the bottom 21 and the intermediate plane 19 does not increase at any point on the bottom 21 with the increase of the radial distance relative to the bolt axis 18. The maximum distance e between the bottom 21 and the intermediate plane 19 therefore exists at least also at the intersection of the bottom 21 and the bolt axis 18. The distance e is measured parallel to the bolt axis 18. The intersection of the bottom 21 and the bolt axis 18 corresponds to the intersection 27 of the second end side 34 with respect to the bolt axis 18. The bottom 21 has a maximum distance a relative to the bolt axis 18. In an embodiment, the maximum distance a corresponds to half the diameter of the bottom 21. The maximum distance a is measured radially relative to the bolt axis 18. The distance a corresponds to the maximum radial distance of the bottom 21 relative to the bolt axis 18. The maximum spacing 'a' of the notch bottom 21 relative to the bolt axis 18 corresponds to at least 30%, and particularly at least 50%, of half the core diameter 'd' of the bolt 4. Thus, the notch bottom 21 provides a sufficiently large area to introduce force into the bolt 4, for example, along the bolt axis 18, during riveting. The maximum spacing 'a' of the notch bottom 21 relative to the bolt axis 18 corresponds to a maximum of 100% of half the core diameter 'd' of the bolt 4. The notch bottom 21 therefore extends radially relative to the bolt axis 18 beyond the bolt section 28, which is arranged in the bolt opening 11 of the connecting link 2. The maximum spacing 'a' of the notch bottom 21 relative to the bolt axis 18 corresponds to a maximum of 80% of half the core diameter 'd' of the bolt 4.

[0049] The maximum distance a between the bottom of the notch 21 and the axis 18 of the rivet is advantageously at least 20%, especially at least 40%, of the maximum diameter p of half the chamfer 25.

[0050] It can be configured such that the bottom 21 of the notch extends partially or completely flat. This is in Figure 6 The center is shown as a solid line. Alternatively, a raised, arched notch 21' may be provided at the bottom of the site. Figure 6 The notch is schematically represented by a dashed line. The arched portion at the bottom of the notch 21' can have a very large radius. The radius of the arch at the intersection 27 of the bottom of the notch is advantageously larger than the core diameter d, and especially larger than the diameter b of the rivet 14.

[0051] The notch edge 22 has a spacing q relative to the intermediate plane 19, which increases radially outward from the notch bottom 21. Figure 6 In the diagram, the spacing q of the middle region of the notch edge 22 is schematically drawn. The spacing q is measured parallel to the axis 18 of the rivet bolt.

[0052] The notch 20 has a maximum spacing c relative to the bolt axis 18. In a symmetrical design, the maximum spacing c corresponds to half the diameter of the notch 20. The maximum spacing c of the notch 20 relative to the bolt axis 18 advantageously corresponds to at least 110% of the maximum spacing a of the bottom 21 of the notch relative to the bolt axis 18. The maximum spacing c of the notch 20 relative to the bolt axis 18 advantageously corresponds to 70% to 120% of half the core diameter d of the bolt 4. Half the core diameter d corresponds to the core radius d / 2. Advantageously, the notch 20 protrudes radially beyond the bolt section 28 along the line of sight of the bolt axis 18 relative to the bolt axis 18, in which the core diameter d is measured. Preferably, the increased outer diameter b of half of the rivet joint 14 is 1.5 to 3.5 times, particularly 2 to 3.5 times, of the maximum spacing a.

[0053] The left-side rivet joint 14 has a height h measured parallel to the rivet bolt axis 18. The height h is advantageously greater than the depth f of the notch 20 measured parallel to the rivet bolt axis 18. The depth f is particularly less than 50% of the height h, and particularly less than 30%. The depth f of the notch 20 is advantageously less than the maximum distance a between the bottom 21 of the notch and the rivet bolt axis 18. Preferably, the depth f is less than 40% of the maximum distance a, and particularly less than 30%.

[0054] The connecting link 2 has a thickness m measured parallel to the riveting bolt axis 18. The chamfer 25 has a depth k measured in the same direction. The depth k is advantageously up to 30%, and more particularly up to 20%, of the thickness m of the notch link 2.

[0055] In this embodiment, the two rivet joints 13 and 14 are constructed differently. The right-hand rivet joint 13 in this embodiment does not have a notch 20. End sides 33 intersect the bolt axis 18 at intersection 26. End sides 33 have a spacing n relative to the intermediate plane 19. Starting from intersection 26, the spacing n decreases with increasing radial spacing relative to the bolt axis 18. Figure 6 In the diagram, the spacing n is exemplarily drawn close to the rivet bolt axis 18. The diameter b of the two rivets 13 and 14 is the same size in the embodiment. The right rivet 13 has a height g, which is measured parallel to the rivet bolt axis 18. In the embodiment, the height g of the right rivet 13 is less than the height h of the left rivet 14 with the notch 20. The first end side 33 extends protrudingly. The bend in the diameter region of the first end side 33 in the notch bottom 21' is mirror symmetrical with respect to the bend in the same diameter region of the notch bottom 21' at the second end side 34. The bend in the notch bottom 21' is... Figure 6 The middle part is exaggerated due to better presentation. In fact, the curved bottom of the notch 21' extends more flatly than it appears.

[0056] The distance n between the intersection point 26 at the first end side 33 and the intermediate plane 17 and the distance e between the intersection point 27 at the second end side 34 and the intermediate plane 17 are preferably approximately the same size. The difference between the distances n and e at the intersection points 26 and 27 is advantageously less than 0.3 mm, especially less than 0.1 mm. Preferably, the distances n and e are the same size within the manufacturing tolerance range.

[0057] The design scheme described above for the rivet bolt 4 can also be configured for use with the saw chain 1 in other constructions.

Claims

1. Saw chain comprising a link (2) and a drive link (3), which are connected to one another in a hinged manner about a rivet axis (18) by means of a rivet pin (4), wherein the rivet pin (4) projects through at least one rivet opening (11) of at least one link (2) and a rivet opening (12) of the drive link (3) arranged between two links (2), wherein the saw chain (1) has a middle plane (19) which is perpendicular to the rivet axis (18) and extends centrally through the drive link (3), wherein the link (2) is partially configured as a cutting link (5, 6) and has a cutting section (7), wherein at least one rivet pin (4) has a notch (20) at at least one end side (34), characterized in that the notch (20) has a notch edge (22), wherein the distance (q) of the notch edge (22) from the middle plane (19) of the saw chain (1) increases with increasing radial distance from the rivet axis (18), the notch (20) has a notch bottom (21, 21') which is surrounded by the notch edge (22), wherein the distance (e) of the notch bottom (21, 21') from the middle plane (19) of the saw chain (1) does not increase at any point of the notch bottom (21, 21') with increasing radial distance from the rivet axis (18), the maximum distance (a) of the notch bottom (21, 21') from the rivet axis (18) corresponds to 30% to 100% of the core diameter (d) of half of the rivet pin (4), and the notch bottom (21') is configured convexly curved.

2. The saw chain according to claim 1, characterized in that The maximum distance (a) of the notch bottom (21, 21') from the rivet axis (18) corresponds to at most 80% of the core diameter (d) of half of the rivet pin (4).

3. The saw chain according to claim 1, characterized in that, The maximum distance (c) of the notch (20) from the rivet axis (18) corresponds to at least 110% of the maximum distance (a) of the notch bottom (21) from the rivet axis (18).

4. The saw chain according to any one of claims 1 to 3, characterized in that, The depth (f) of the notch (20) measured parallel to the rivet axis (18) is less than the maximum distance (a) of the notch bottom (21, 21') from the rivet axis (18).

5. The saw chain according to claim 4, characterized in that The depth (f) of the notch (20) measured parallel to the rivet axis (18) is less than 40% of the maximum distance of the notch bottom (21, 21') from the rivet axis (18).

6. The saw chain according to claim 4, characterized in that, The depth (f) of the notch (20) measured parallel to the rivet axis (18) is less than 30% of the maximum distance of the notch bottom (21, 21') from the rivet axis (18).

7. The saw chain according to claim 1, characterized in that, At least one end side (33, 34) of the rivet pin (4) is configured with an increased outer diameter (b) at the rivet head (13, 14) which projects beyond the outer face (23) of the associated link (2).

8. The saw chain according to claim 7, characterized in that The height (h) of the rivet head (14) measured parallel to the rivet pin axis (18) is greater than the depth (f) of the recess (20) measured parallel to the rivet pin axis (18).

9. The saw chain according to claim 7, characterized in that, The ratio of the increased outer diameter (b) of one half of the rivet head (14) to the maximum distance (a) of the recess bottom (21, 21') from the rivet pin axis (18) is 1.5 to 3.

5.

10. The saw chain according to claim 1, characterized in that, The connecting link (2) has a chamfer (25) at the riveting opening (11) with a depth (k) of up to 30% of the thickness (m) of the connecting link (2).

11. The saw chain according to claim 1, characterized in that The connecting link (2) has a chamfer (25) at the riveting opening (11) with a depth (k) of up to 20% of the thickness (m) of the connecting link (2).

12. The saw chain according to claim 1, characterized in that, The rivet pin (4) has a flange (24) which is arranged in the riveting opening (12) of the drive link (3) and does not protrude into the riveting opening (11) of the connecting link (2).

13. A saw chain comprising connecting links (2) and a drive link (3) which are connected to one another hingedly about a rivet pin axis (18) by means of a rivet pin (4), wherein the rivet pin (4) protrudes through at least one riveting opening (11) of at least one connecting link (2) and a riveting opening (12) of a drive link (3) arranged between two connecting links (2), wherein the saw chain (1) has a median plane (19) which is perpendicular to the rivet pin axis (18) and extends centrally through the drive link (3), wherein the connecting links (2) are partially configured as cutting links (5, 6) and have a cutting section (7), wherein at least one rivet pin (4) has a recess (20) at at least one end side (34), characterized in that The rivet pin (4) is configured as a solid body and has a first end side (33) and a second end side (34) which are configured differently, the second end side (34) having the recess (20) and the first end side (33) having no recess (20), and the recess bottom (21') of the recess (20) being configured convexly.

14. The saw chain according to claim 13, characterized in that The first end side (33) is configured at a first rivet head (13) and the second end side (34) is configured at a second rivet head (14), and the height (h) of the second rivet head (14) measured in the direction of the rivet pin axis (18) is greater than the height (g) of the first rivet head (13) measured in the direction of the rivet pin axis (18).

15. The saw chain according to claim 13, characterized in that The first end side (33) is configured convexly.

16. The saw chain according to claim 13, characterized in that The curvature of the first end side (33) in the diameter region of the recess bottom (21') is mirror-symmetrical to the curvature of the recess bottom (21') in the same diameter region at the second end side (34).

17. The saw chain according to claim 13, characterized by The difference between the distance (n) of the first end side (33) from the middle plane (19) at the intersection point (26) of the rivet axis (18) with the first end side (33) and the distance (e) of the second end side (34) from the middle plane (19) at the intersection point (27) of the rivet axis (18) with the second end side (34) is less than 0.3 mm.

18. The saw chain according to claim 13, characterized by At least one end side (33, 34) of the rivet (4) is configured with an increased outer diameter (b) at the rivet head (13, 14) which protrudes beyond the outer face (23) of the associated connection element (2).

Images