Insertion end of a tool, related manufacturing method and tool holder

Abstract

The invention relates to an insertion end (4) of a tool (2) driven in rotation about a longitudinal axis and / or by impact, wherein the insertion end (4) extends along the longitudinal axis, starting from a holder-side front end (6) of the tool (2), having at least two locking grooves (8a, 8b) running in the direction of the longitudinal axis and spaced apart from one another in the circumferential direction (U), having a groove width and a longitudinal extent, wherein the locking grooves (8a, 8b) are closed in the axial direction (A) at a locking end (10) facing the holder-side front end (6), and at least two rotary driving grooves (12a, 12b) running in the direction of the longitudinal axis and spaced apart from one another in the circumferential direction, wherein the rotary driving grooves (12a, 12b) extend axially starting from the holder-side front end (6) and are formed open towards the front end (6). The invention further relates to a method and to a tool holder (100).

Description

[0001] Insertion end of a tool, relevant manufacturing process and tool holder

[0002] The invention relates to an insertion end of a tool that is driven in rotation about a longitudinal axis and / or by impact, wherein the insertion end extends along the longitudinal axis starting from a receiving-side front end of the tool and has a maximum guide diameter, with at least two locking grooves that run in the direction of the longitudinal axis and are spaced apart from one another in the circumferential direction, with a groove width and a longitudinal extent, wherein the locking grooves are designed to cooperate with at least one locking means of a tool holder, and wherein the locking grooves are closed in the axial direction at a locking end facing the receiving-side front end, as well as at least two rotary driving grooves that run in the direction of the longitudinal axis and are spaced apart from one another in the circumferential direction, which are designed to cooperate with a rotary driving means of the same tool holder,wherein the rotary driving grooves extend axially from the receiving-side front end and are open towards the front end.,

[0003] It is known from the prior art to guide impact and rotary driven tools with a shank end in a tool holder in a form-fitting, non-rotatable manner and with limited axial movement. The shank end is locked by two locking elements that penetrate the locking grooves.

[0004] The shank ends and associated tool holders currently most commonly used in hammer drill systems worldwide originate from the published patent application DE 2551125. This document discloses a cylindrical jacket-shaped guide surface on the holder side with a guide diameter of 10 mm, with axially open rotary drive grooves provided towards the tool-side front end. In the associated tool holder, at least one radially displaceable locking body engages in a locking groove, thus limiting the axial mobility of the tool in the tool holder. In addition, two opposing rotary drive webs each engage in a rotary drive groove of the shank end, each transmitting the torque via a tangential contact surface. It was originally intended to provide such shank ends for smaller drill diameters up to approximately 17 mm and to use them in conjunction with hammer drills with an output of up to 650 W.For such combinations of tool and drive machine, no or at most minimal signs of wear were observed in practice.

[0005] Recently, increasingly powerful drive units, especially hammer drills, have been developed that allow for the transmission of higher torques. This has resulted in ever larger drill diameters, up to 30 mm, for example, being realized for existing shank end systems. However, the disadvantage of this approach is that increasing wear and damage to the tool holder and shank ends are observed with such drill diameters. However, the widespread use of hammer drill systems that are compatible with existing shank ends argues against a completely new development of tool holders.

[0006] To prevent such wear phenomena, EP 1 537 956 B1 proposes extending the rotary drive groove in the axial direction, starting from the receiving-side end face, so that the rotary drive groove has a longitudinal extent that is significantly greater than the longitudinal extent of the locking groove. However, this approach has shown that, to prevent wear phenomena, the rotary drive groove must be extended in such a way that, on the one hand, there is insufficient space in the area of ​​the insertion end to label or stamp the insertion end. On the other hand, sealing problems with the tool holder have been observed due to the longitudinal extent of the rotary drive groove, since the rotary drive groove allows dust to pass past seals provided on the machine side.Against this background, the object of the invention was to further develop a shank and a tool holder of the type mentioned above in such a way that the disadvantages found in the prior art are eliminated as far as possible. In particular, the aim was to provide a shank that is compatible with existing systems and, at the same time, is less susceptible to damage and wear, especially for larger drill diameters and higher machine power.

[0007] According to the invention, the object is achieved in a spigot end of the type mentioned at the outset by the features of the characterising part of claim 1.

[0008] The invention takes advantage of the finding that the additional rotary drive surfaces are designed to transmit part of the torque between the shank and the tool holder. This means that only a portion of the total torque needs to be transmitted via the rotary drive grooves. The risk of wear and damage to the tool holder and shank is thereby reduced, even when larger drill diameters, e.g., 30 mm, and more powerful hammer drills are used. To achieve the inventive advantages in terms of wear reduction, the use of the shank with a tool holder according to the invention is necessary. However, the shank according to the invention is not limited to such use. Rather, it is fully compatible with existing SDS systems.Furthermore, it is avoided that the plug end is inserted incorrectly into a tool holder, which can lead to a so-called beak-in.

[0009] By providing the flanks, torque can be transmitted to the shank end with low wear. For a given torque, the flanks can be used to specify a shank end that has a smaller axial extension yet is still low-wear. The shank end thus also has a lower mass, and less material is required to manufacture it. A correspondingly designed receptacle can also be made more compact, in particular with a smaller axial extension. The fact that the locking groove is arranged within the surface of the rotary drive surfaces also results in a particularly compact shank end.

[0010] Because the rotary drive surfaces have a greater longitudinal extension in the axial direction, starting from the end face on the receiving side, than the corresponding locking grooves, a corresponding area of ​​the rotary drive surfaces adjacent to the locking groove is available to cooperate with a corresponding drive surface of the tool holder and transmit a corresponding torque. At the same time, the rotary drive grooves can be dimensioned so that a sufficiently wide free surface is available at the insertion end for stamping the insertion end, and the insertion end can be sealed against the tool holder using sealing means provided on the tool holder.

[0011] According to one embodiment, the locking groove extends into a region adjacent to the receiving end, but is axially spaced therefrom. Preferably, the distance between the axial boundary of the locking groove facing the receiving end and the receiving end is smaller than the guide diameter of the insertion end.

[0012] According to one embodiment, the rotary drive surfaces have a transverse extension transverse to the longitudinal axis that is substantially equal to or greater than the slot width of the locking slots. The term "substantially equal" here means that the transverse extension of the rotary drive surfaces is equal to the slot width or has slight deviations therefrom. Such a configuration of the transverse extension ensures that the area of ​​the rotary drive surfaces suitable for torque transmission is sufficiently large.

[0013] According to one embodiment, the longitudinal extent of the rotary drive grooves is substantially equal to the longitudinal extent of the rotary drive surfaces. This ensures that torque can be transmitted via both the rotary drive grooves and the rotary drive surface, while simultaneously dimensioning the rotary drive grooves or rotary drive surfaces in such a way that wear on the shank end in the area of ​​the rotary drive grooves or rotary drive surfaces is avoided or significantly reduced, even when using larger drill diameters and machine power.

[0014] According to one embodiment, the rotary drive surfaces are designed as substantially flat surfaces or have flat surface sections. This ensures compatibility with correspondingly designed drive surfaces of the tool holder. According to one embodiment, the rotary drive surfaces and a circumferential outer edge of the locking grooves form a common edge. Thus, the rotary drive surfaces are, in a sense, intersected by a circumferential outer edge of the locking grooves.

[0015] According to one embodiment, the shank end has a uniform guide diameter along its length. This takes into account the concept of compatibility with existing tool holders. Furthermore, the uniform guide diameter gives the shank end improved guidance properties in a tool holder.

[0016] According to one embodiment, the rotary drive surfaces extend to the receiving-side end face or to the edge adjacent to the receiving-side end face such that the rotary drive surfaces are open to the receiving-side end face. This ensures that the drive surfaces of the receiving opening can interact with the rotary drive surfaces to transmit torque after the insertion end is inserted into the tool holder.

[0017] According to one embodiment, the longitudinal extent of the rotary drive surfaces is 1.3 to 1.8 times greater than the longitudinal extent of the locking grooves. This ensures that a sufficiently dimensioned surface area of ​​the rotary drive surfaces is available for torque transmission.

[0018] According to one embodiment, the longitudinal extent of the rotary driving surfaces and / or the rotary driving grooves is 3.0 to 3.8 times the guide diameter. This ensures that the surface intended for torque transmission is sufficiently large and, at the same time, ensures that sufficient space remains in the area of ​​the insertion end to label or stamp the insertion end, and, on the other hand, that a sealing of the insertion end with respect to the tool holder remains possible. Extending the rotary driving surfaces and / or the rotary driving grooves beyond the specified area would result in the space available for labeling the insertion end being too small, resulting in problems with sealing the insertion end with respect to the tool holder.

[0019] According to one embodiment, the corner distance, measured as the chord length between each rotary driving surface and a rotary driving groove, is at least 2.5 mm. This ensures that the torques occurring during operation can be transmitted without significant material wear, while simultaneously ensuring good guidance within the tool holder. Furthermore, reliable transmission of the impact impulse from the tool holder to the shank end is achieved.

[0020] According to one embodiment, the first rotary drive groove is arranged diametrically opposite the second rotary drive groove in the circumferential direction. According to one embodiment, the first locking groove is arranged diametrically opposite the second locking groove in the circumferential direction. According to one embodiment, adjacent rotary drive grooves and locking grooves are arranged offset by 80° to 100°, in particular 90°, in the circumferential direction.

[0021] According to one embodiment, the rotational driving surface associated with the first locking groove is arranged circumferentially opposite the rotational driving surface associated with the second locking groove. The rotational driving surfaces preferably extend substantially parallel to one another.

[0022] According to one embodiment, the rotary drive surfaces run essentially parallel to a groove base of the locking grooves. According to one embodiment, the distance between the two rotary drive surfaces in the radial direction is between 75% and 90% of the guide diameter. This ensures that, on the one hand, the locking grooves retain a sufficient groove depth to securely hold the insertion end in the tool holder, and, on the other hand, a sufficiently large area of ​​the rotary drive surfaces is available for torque transmission.

[0023] According to an alternative embodiment, at least one or, in particular, both locking grooves are each assigned at least one first rotational driving surface and a second rotational driving surface. According to one embodiment, the rotational driving surfaces assigned to the first locking groove and the rotational driving surfaces assigned to the second locking groove are symmetrical transversely to the longitudinal axis. According to one embodiment, the first rotational driving surface assigned to a locking groove each has at least two flanks running in the direction of the longitudinal axis. According to one embodiment, the second rotational driving surface also each has at least two flanks running in the direction of the longitudinal axis. The flanks assigned to a rotational driving surface preferably have an external angle of 180° to 230° to one another.In other words, the first rotary drive surface and the second rotary drive surface are each preferably symmetrically V-shaped. This allows torque to be transmitted particularly efficiently between the shank end and the tool holder, while such a shank end design also ensures compatibility with existing tool holders.

[0024] According to an alternative embodiment, the first rotary driving surface and the second rotary driving surface are V-shaped, with the V-shape being asymmetrical, such that the base of the contacting first rotary driving surface and the second rotary driving surface is displaced on one side in the circumferential direction. In particular, the rotary driving surface leading in the direction of tool rotation, i.e., the loaded rotary driving surface, is designed to be steeper. This results in a steeper pressure angle for a correspondingly designed tool holder and corresponding driving means, which can optimize torque transmission in the direction of tool rotation.

[0025] According to one embodiment, flanks of the first rotational driving surface and the second rotational driving surface that are adjacent in the circumferential direction have an internal angle of 80° to 120° to one another. According to one embodiment, a cylindrical surface section is arranged between the flanks of the first rotational driving surface and the second rotational driving surface that are adjacent in the circumferential direction. A diameter of the cylindrical surface section preferably corresponds to the guide diameter. According to one embodiment, the cylindrical surface section extends, in particular completely, along the longitudinal extent of the rotational driving surfaces and is interrupted by the respective locking groove, wherein the cylindrical surface section axially borders the locking groove on both sides and forms elevations that extend radially outwardly relative to the locking groove.In this way, the sections of the cylindrical surface adjacent to the locking groove and the rotary drive surfaces provide a retraction lock for the insertion end in the tool holder. In other words, the cylindrical surface and the locking surfaces provide improved axial retention for locking elements engaging in the locking grooves.

[0026] The invention has been described above with reference to a spigot end. In a further aspect, the invention relates to a method for producing a spigot end according to one of the preceding claims. The invention achieves the object defined at the outset with regard to the method by the method steps: a) providing a cylindrical tool semi-finished product, b) inserting the semi-finished product into a die while partially reducing the diameter of the semi-finished product, c) forming the rotary driving grooves, d) forming the rotary driving surfaces, optionally e) inserting the semi-finished product into a closing die and impressing the locking grooves by radially advancing movable forming bodies located in the closing die, wherein the forming of the rotary driving grooves and rotary driving surfaces takes place in the same die.

[0027] In this way, particularly efficient forming of the rotary drive grooves and rotary drive surfaces is achieved, as they are formed in only one die. Die changes are thus reduced to a minimum. Furthermore, an alignment or calibration process, which would be necessary when using two dies, is no longer required to produce the rotary drive grooves and rotary drive surfaces. Overall, the device provided for producing the spigot ends can thus be made less complex and thus more cost-effective. The method utilizes the same advantages and preferred embodiments as the spigot end according to the invention, and vice versa. In this regard, reference is made to the above statements, the content of which is hereby incorporated.

[0028] In a further aspect, the invention relates to a tool holder with a receiving opening for an insertion end, in particular according to one of the forthcoming embodiments. The invention achieves the object described above with regard to the tool holder by means of at least one radially displaceable locking element arranged in locking openings for interacting with axially closed locking grooves, at least two driving strips for interacting with rotary driving grooves open axially towards the receiving-side front end of the insertion end, and at least one driving surface for interacting with rotary driving surfaces open axially towards the receiving-side front end of the insertion end, wherein the axial projection of the driving surfaces overlaps the axial projection of the region of the respective locking element projecting into the receiving opening.

[0029] In this way, on the one hand, the insertion end is held securely in the tool holder and, on the other hand, torque is transmitted by means of the driving bars and driving surfaces, so that overall a higher torque can be transmitted between the tool holder and the insertion end without having to fear excessive wear on the components.

[0030] According to one embodiment, the carrier strips are arranged at least approximately diametrically opposite one another in the axial direction. According to one embodiment, the locking elements are arranged diametrically opposite one another in the axial direction. The locking elements are preferably designed as balls or rollers.

[0031] According to one embodiment, the longitudinal extent of the driving surface and the driving strips is at least approximately equal and amounts in particular to 1.5 to 2.0 times the maximum axial play of the insertion end. In this way, a secure torque transmission between the insertion end and the tool holder is achieved.

[0032] According to one embodiment, two driving surfaces are provided, which are designed and arranged substantially diametrically opposite one another and, in particular, parallel to one another. This enables advantageous force transmission from the tool holder to a correspondingly designed insertion end.

[0033] According to one embodiment, the drive surfaces are flat. According to one embodiment, the center connecting line of the drive surfaces and the center connecting line of the locking openings coincide.

[0034] According to an alternative embodiment, four drive surfaces are provided, wherein two of the four drive surfaces are arranged adjacent to each other in the circumferential direction, and wherein the axial projection of each two adjacent drive surfaces at least partially overlaps the axial projection of a region of the respective locking element that projects into the receiving opening. The drive surfaces are preferably symmetrical transversely to the longitudinal axis.

[0035] According to one embodiment, the adjacent driving surfaces each have at least two, in particular flat, flanks extending in the direction of the longitudinal axis. According to one embodiment, the flanks assigned to a driving surface have an external angle of 180° to 230° to one another. According to one embodiment, adjacent flanks of adjacent driving surfaces have an internal angle of 80° to 120° to one another. Furthermore, the tool holder utilizes the same advantages and preferred embodiments as the insertion end according to the invention and the method according to the invention, and vice versa. In this regard, reference is made to the above statements, the content of which is hereby incorporated.

[0036] In a further aspect, the invention relates to the use of a tool holder according to one of the preceding embodiments for receiving an insertion end according to one of the preceding embodiments. This use utilizes the same advantages and preferred embodiments as the insertion end according to the invention and the tool holder according to the invention, and vice versa. In this regard, reference is made to the above statements, and their content is hereby incorporated.

[0037] The invention is described in more detail below using the following exemplary embodiments:

[0038] 1. Embodiment: Insertion end (4) of a tool (2) driven in rotation about a longitudinal axis (L) and / or by impact, wherein the insertion end (4) extends along the longitudinal axis (L) starting from a receiving-side front end (6) of the tool (2) and has a maximum guide diameter (D), with at least two locking grooves (8a, 8b) running in the direction of the longitudinal axis (L) and spaced apart from one another in the circumferential direction (U), with a groove width (W) and a longitudinal extent (LN), wherein the locking grooves (8a, 8b) are designed to cooperate with at least one locking means of a tool holder (100), and wherein the locking grooves (8a, 8b) are closed in the axial direction (A) at a locking end (10) facing the receiving-side front end (6), and at least two running in the direction of the longitudinal axis (L) and in the circumferential direction spaced-apart rotary driving grooves (12a, 12b) which are designed toto cooperate with a respective rotary driving means of the same tool holder (100), wherein the rotary driving grooves (12a, 12b) extend axially from the holder-side front end (6) and are open towards the front end (6), wherein at least one locking groove (8a, 8b) is assigned a rotary driving surface (14a, 14b, 15a, 15b) which overlaps the respective locking groove (8a, 8b) and is designed to cooperate with a driving surface of the same tool holder (100), wherein the rotary driving surfaces (14a, 14b, 15a, 15b) have a longitudinal extension (LF) in the axial direction (A) starting from the holder-side front end, which is greater than the longitudinal extension (LN) of the respective locking groove (8a, 8b).

[0039] 2nd embodiment: Insertion end (4) according to embodiment 1, characterized in that the rotary driving surfaces (14a, 14b, 15a, 15b) have a transverse extension (Q) transverse to the longitudinal axis (L), which is substantially equal to or greater than the groove width (W) of the locking grooves (8a, 8b).

[0040] 3. Embodiment: Insertion end (4) according to embodiment 1 or 2, characterized in that the longitudinal extent (LD) of the rotary driving grooves (12a, 12b) is substantially equal to the longitudinal extent (LF) of the rotary driving surfaces (14a, 14b, 15a, 15b).

[0041] 4. Embodiment: Insertion end (4) according to one of the preceding embodiments, characterized in that the rotary driving surfaces (14a, 14b, 15a, 15b) are designed as substantially flat surfaces (30) or have flat surface sections.

[0042] 5. Embodiment: Insertion end (4) according to one of the preceding embodiments, characterized in that the rotary driving surfaces (14a, 14b, 15a, 15b) and a circumferential groove outer edge (16) of the locking grooves (8a, 8b) form a common edge (18).

[0043] 6. Embodiment: Insertion end (4) according to one of the preceding embodiments, characterized in that the longitudinal extent (LF) of the rotary driving surfaces (14a, 14b, 15a, 15b) is 1.3 times to 1.8 times greater than the longitudinal extent (LN) of the locking grooves (8a, 8b).

[0044] 7th embodiment: Insertion end (4) according to one of the preceding embodiments, characterized in that the longitudinal extent (LF) of the rotary driving surfaces (14a, 14b, 15a, 15b) and / or the rotary driving grooves (12a, 12b) is 3.0 to 3.8 times the guide diameter (D). 8th embodiment: Insertion end (4) according to one of the preceding embodiments, characterized in that the corner distance (E) between the rotary driving surfaces (14a, 14b) and the rotary driving grooves (12a, 12b) is at least 2.5 mm.

[0045] 9. Embodiment: Insertion end (4) according to one of the preceding embodiments, characterized in that the rotary driving surface (14a) associated with the first locking groove (8a) is arranged in the circumferential direction (U) opposite the rotary driving surface (14b) associated with the second locking groove (8b).

[0046] 10. Embodiment: Insertion end (4) according to embodiment 9, characterized in that rotary driving surfaces (14a, 14b) run substantially parallel to one another.

[0047] 11. Embodiment: Insertion end (4) according to one of the preceding embodiments, characterized in that a distance (20) between the two rotary driving surfaces (14a, 14b) in the radial direction from one another is between 75% and 90% of the guide diameter (D).

[0048] 12th embodiment: Insertion end (4) according to one of the embodiments 1 to 8, characterized in that at least one first rotary driving surface (14a, 14b) and one second rotary driving surface (15a, 15b) are assigned to the locking grooves (8a, 8b).

[0049] 13. Embodiment: Insertion end (4) according to embodiment 12, characterized in that the rotary driving surfaces (14a, 15a) assigned to the first locking groove (8a) and the rotary driving surfaces (14b, 15b) assigned to the second locking groove (8b) are formed symmetrically transversely to the longitudinal axis (L).

[0050] 14th embodiment: insertion end (4) according to embodiment 12 or 13, characterized in that the first rotary driving surface (14a, 14b) and second rotary driving surface (15a, 15b) assigned to a locking groove (8a, 8b) each have at least two flanks (22) running in the direction of the longitudinal axis, which flanks enclose an external angle (24) of 190° to 230° with respect to one another. 15th embodiment: insertion end (4) according to embodiment 14, characterized in that flanks of the first rotary driving surface (14a, 14b) and the second rotary driving surface (15a, 15b) adjacent in the circumferential direction (U) enclose an internal angle (26) of 80° to 120° with respect to one another.

[0051] 16th embodiment: insertion end (4) according to embodiment 14 or 15, characterized in that a cylindrical surface section (28) is arranged between the flanks (22) of the first rotational driving surface (14a, 14b) and the second rotational driving surface (15a, 15b) which are adjacent in the circumferential direction (U), which cylindrical surface section (28) extends along the longitudinal extent (LF) of the rotational driving surfaces (14a, 14b, 15a, 15b) and is interrupted by the respective locking groove (8a, 8b), wherein the cylindrical surface section (28) axially adjoins the locking groove (8a, 8b) on both sides and forms elevations (36) extending radially outwards relative to the locking groove (8a, 8b).

[0052] 17th embodiment: Insertion end (4) according to one of the embodiments 12 to 16, characterized in that the four rotary driving surfaces (14a, 14b, 15a, 15b) form four flank pairs (22) and a total of eight flanks (22) in the circumferential direction (U).

[0053] 18th embodiment: Method for producing an insertion end (4) according to one of the preceding embodiments, characterized by the method steps: a) providing a cylindrical tool semi-finished product, b) inserting the semi-finished product into a die with partial reduction of the diameter of the semi-finished product, c) forming the rotary driving grooves (12a, 12b), d) forming the rotary driving surfaces (14a, 14b, 15a, 15b), e) Optionally, inserting the semi-finished product into a closing die and impressing the locking grooves (8a, 8b) by radially advancing two movable forming bodies located in the closing die, wherein the forming of the rotary driving grooves (12a, 12b) and rotary driving surfaces (14a, 14b, 15a, 15b) takes place in the same die.

[0054] 19. Embodiment: Tool holder (100) with a receiving opening (102) for an insertion end (4), in particular according to one of the embodiments 1 to 17, characterized by at least one radially displaceable locking element (106) arranged in locking openings (104) for interacting with axially closed locking grooves (8a, 8b), at least two driving strips (108) for interacting with rotary driving grooves (12a, 12b) open axially towards the receiving-side end face (6) of the insertion end (4), and at least one driving surface (110) for interacting with rotary driving surfaces (14a, 14b, 15a, 15b) open axially towards the receiving-side end face (6) of the insertion end (4), wherein the axial projection of the driving surfaces (110) is the axial projection of the area projecting into the receiving opening (102). of the respective locking element (106) at least partially overlaps.

[0055] 20. Embodiment: Tool holder (100) according to embodiment 19, characterized in that the driving strips (108) are at least approximately diametrically opposite one another in the axial direction (A).

[0056] 21. Embodiment: Tool holder (100) according to one of the embodiments 19 or 20, characterized in that the longitudinal extent (ML) of the driving surfaces (110) and the driving strips (108) is at least approximately equal and in particular amounts to 1.5 to 2.0 times the maximum axial play (112) of the insertion end (4).

[0057] 22nd embodiment: Tool holder (100) according to one of the embodiments 19 to 21, characterized in that the locking elements (106) are at least approximately diametrically opposite one another in the axial direction (A).

[0058] 23. Embodiment: Tool holder (100) according to one of the embodiments 19 to 22, characterized in that two driving surfaces (110) are provided which are substantially diametrically opposite one another and in particular are formed parallel to one another.

[0059] 24th embodiment: Tool holder (100) according to embodiment 23, characterized in that the driving surfaces (110) are flat. 25th embodiment: Tool holder (100) according to embodiment 23 or 24, characterized in that the center connecting line of the driving surfaces (110) and the center connecting line of the locking openings (104) coincide.

[0060] 26. Embodiment: Tool holder (100) according to one of the embodiments 19 to 22, characterized in that four driving surfaces (110) are provided, wherein two of the four driving surfaces (110) are arranged adjacent to one another in the circumferential direction (U) and wherein the axial projection of two adjacent driving surfaces (110) at least partially overlaps the axial projection of a region of the respective locking element (106) projecting into the receiving opening (102), in particular wherein the driving surfaces (100) are designed symmetrically transversely to the longitudinal axis (L).

[0061] 27. Embodiment: Tool holder (100) according to embodiment 26, characterized in that the driving surfaces (110) each have at least two, in particular flat, flanks (122) running in the direction of the longitudinal axis, wherein adjacent flanks (122) of a driving surface (110) enclose an external angle (124) of 190 ° to 230 ° with respect to one another, in particular wherein adjacent flanks (122) of adjacent driving surfaces (110) enclose an internal angle (126) of 80 ° to 120 ° with respect to one another.

[0062] 28th embodiment: Use of a tool holder (100) according to one of the embodiments 19 to 27 for receiving an insertion end (4) according to one of the embodiments 1 to 17.

[0063] The invention is described in more detail below using preferred embodiments with reference to the attached figures.

[0064] Here we show:

[0065] Fig. 1 shows a first embodiment of an inventive

[0066] Insert end in a perspective view;

[0067] Fig. 2 and 3 the embodiment according to Fig. 1 in side views; Fig. 4 the embodiment according to Figs. 1-3 in a

[0068] sectional view;

[0069] Figs. 5 and 6 show an alternative embodiment of a drill with a shank according to the invention in perspective views;

[0070] Fig. 7 to 10 the insertion end according to Fig. 5 and 6 in different

[0071] Side views or sectional views;

[0072] Fig. 11 a tool holder according to the invention in a

[0073] sectional view;

[0074] Fig. 12 and 13 axial sectional views of the tool holder according to the invention according to Fig. 11;

[0075] Fig. 14 an alternative embodiment of an inventive

[0076] Tool holder in a sectional view; and

[0077] Fig. 15 and 16 axial sectional views of the tool holder according to the invention as shown in Fig. 14.

[0078] Figures 1 to 4 show an insertion end 4 of a tool 2 that is driven to rotate about a longitudinal axis L and / or by impact. The insertion end 4 extends along the longitudinal axis L starting from a receiving-side front end 6 of the tool 2. The insertion end 4 has a maximum guide diameter D. The insertion end 4 further has two locking grooves 8a, 8b running in the direction of the longitudinal axis L and spaced from one another in the circumferential direction U. The locking grooves 8a, 8b each have a groove width W and a longitudinal extent LN. The locking grooves 8a, 8b are each designed to cooperate with a locking means of a tool holder 100 (see Figures 11 to 13). The locking grooves 8a, 8b are closed in the axial direction A at a locking end 10 facing the receiving-side front end 6.The insertion end 4 further has two rotary drive grooves 12a, 12b extending in the direction of the longitudinal axis L and spaced apart from one another in the circumferential direction. The rotary drive grooves 12a, 12b are each configured to cooperate with a rotary drive means of the same tool holder 100. The rotary drive grooves 12a, 12b extend axially from the holder-side end face 6 and are open toward the end face 6. The rotary drive grooves 12a, 12b each have at least one tangential force surface 34.

[0079] Furthermore, the insertion end 4 has rotary driving surfaces 14a, 14b, which are assigned to the locking grooves 8a, 8b. The rotary driving surfaces 14a, 14b are designed to cooperate with a driving surface of the same tool holder 100. The rotary driving surfaces 14a, 14b have a longitudinal extent LF in the axial direction A, starting from the holder-side end face 6, which is greater than the longitudinal extent LN of the respective locking groove 8a, 8b. The rotary driving surface 14a assigned to the first locking groove 8a is arranged opposite the rotary driving surface 14b assigned to the second locking groove 8b in the circumferential direction U, as can be seen in particular in Figure 2. The rotary driving surfaces 14a, 14b run essentially parallel to one another. A distance 20 between the two rotary driving surfaces 14a, 14b in the radial direction is between 75% and 90% of the guide diameter D of the insertion end 4.

[0080] The rotary driving surfaces 14a, 14b have a transverse extent Q transverse to the longitudinal axis L. The transverse extent Q is substantially equal to or greater than the groove width W of the locking grooves 8a, 8b. The longitudinal extent LD of the rotary driving grooves 12a, 12b is substantially equal to the longitudinal extent LF of the rotary driving surfaces 14a, 14b. In the embodiment shown in Figures 1 to 4, the rotary driving surfaces 14a, 14b are designed as substantially flat surfaces 30. The rotary driving surfaces 14a, 14b and a circumferential groove outer edge 16 of the respective locking grooves 8a, 8b form a common edge 18. The rotary driving surfaces 14a, 14b extend to the receiving-side front end 6 such that the rotary driving surfaces 14a, 14b are open to the receiving-side front end 6.

[0081] The longitudinal extent LF of the rotary driving surfaces 14a, 14b is 1.3 to 1.8 times greater than the longitudinal extent LN of the locking grooves 8a, 8b. Furthermore, the longitudinal extent LF of the rotary driving surfaces 14a, 14b and the rotary driving grooves 12a, 12b is 3.0 to 3.8 times the guide diameter. As shown in Figure 4, the corner distance E between the rotary driving surfaces 14a, 14b and the rotary driving grooves 12a, 12b is at least 2.5 mm. The first rotary driving groove 12a and the second rotary driving groove 12b are arranged diametrically opposite one another in the circumferential direction U. The first locking groove 8a and the second locking groove 8b are also arranged diametrically opposite one another in the circumferential direction U. In the embodiment shown in Figures 1 to 4, the rotary drive grooves 12a, 12b and the locking grooves 8a, 8b are each offset by 90° in the circumferential direction U.

[0082] Figures 5 to 10 show a further exemplary embodiment of an insertion end 4 according to the invention of a tool 2 that is driven so as to rotate about a longitudinal axis L and / or by impact, which, as shown in Figure 6, can be designed, for example, as a drill. The insertion end 4 extends along the longitudinal axis L, starting from the receiving-side front end 6 of the tool 2 and, as already described with reference to Figures 1 to 4, has a maximum guide diameter D. The exemplary embodiment shown in Figures 5 to 10 also has two locking grooves 8a, 8b that run in the direction of the longitudinal axis L and are spaced apart from one another in the circumferential direction U, said locking grooves having a groove width W and a longitudinal extent LN. The locking grooves 8a, 8b are closed in the axial direction A at the locking end 10 facing the receiving-side front end 6.In addition, two rotary drive grooves 12a, 12b are provided, extending in the direction of the longitudinal axis L and spaced apart from one another in the circumferential direction. These extend axially from the receiving-side end face 6 and are open toward the end face 6. The rotary drive grooves 12a, 12b each have at least one tangential force surface 34. In the second embodiment, each of the locking grooves 8a, 8b is assigned two rotary drive surfaces 14a, 14b, 15a, 15b that overlap the respective locking groove 8a, 8b.

[0083] The rotary drive surfaces 14a, 14b, 15a, 15b have a longitudinal extension LF in the axial direction A, starting from the receiving-side end face 6, which is greater than the longitudinal extension LN of the respective locking groove 8a, 8b. A first rotary drive surface 14a, 14b and a second rotary drive surface 15a, 15b are each assigned to the locking grooves 8a, 8b. The rotary drive surfaces 14a, 15a assigned to the first locking groove 8a and the rotary drive surfaces 14b, 15b assigned to the second locking groove 8b are symmetrical transversely to the longitudinal axis L. The first rotary driving surface 14a, 14b and the second rotary driving surface 15a, 15b assigned to a locking groove 8a, 8b each have two flanks 22 running in the direction of the longitudinal axis, which are aligned in a V-shape with respect to one another.

[0084] The flanks 22 form an outer angle 24 with respect to one another. Furthermore, flanks of the first rotational driving surface 14a, 14b and the second rotational driving surface 15a, 15b that are adjacent in the circumferential direction U form an inner angle 26 with respect to one another. Between the flanks 22 of the first rotational driving surface 14a, 14b and the second rotational driving surface 15a, 15b that are adjacent in the circumferential direction U, a cylindrical surface section 28 is arranged in the region that is not interrupted by the locking grooves 8a, 8b. The cylindrical surface section 28 extends, in particular, completely along the longitudinal extent LF of the rotational driving surfaces 14a, 14b, 15a, 15b. The cylindrical surface section 28 borders axially on both sides on the locking groove 8a, 8b and forms elevations 36 extending radially outwards relative to the locking groove 8a, 8b.The elevation 36 enables the insertion end 4 to have a high degree of retraction security, since a locking body engaging in the locking grooves 8a, 8b is held axially by the elevation 36. The cylindrical surface section 28, together with the rotary drive surfaces 14a, 14b, 15a, 15b, provides improved axial support for a locking body inserted in the locking grooves 8a, 8b. The four rotary drive surfaces 14a, 14b, 15a, 15b form four flank pairs 22 in the circumferential direction U and a total of eight flanks 22.

[0085] The rotary driving surfaces 14a, 14b, 15a, 15b have a transverse extension Q transverse to the longitudinal axis L, which is substantially equal to or greater than the groove width W of the locking grooves 8a, 8b. Furthermore, in the embodiment shown in Figures 5 to 10, the longitudinal extension LD of the rotary driving grooves 12a, 12b is substantially equal to the longitudinal extension LF of the rotary driving surfaces 14a, 14b, 15a, 15b. The rotary driving surfaces 14a, 14b, 15a, 15b have flat surface sections in the form of flanks 22, which can correspond to a correspondingly designed tool holder. The rotary drive surfaces 14a, 14b, 15a, 15b and a circumferential groove outer edge 16 of the locking grooves 8a, 8b form a common edge 18. Furthermore, the rotary drive surfaces 14a, 14b, 15a, 15b extend to the receiving-side end face 6, such that the rotary drive surfaces 14a, 14b, 15a, 15b are open toward the receiving-side end face 6.The first rotary drive groove 12a is arranged diametrically opposite the second rotary drive groove 12b in the circumferential direction U. The first locking groove 8a is arranged diametrically opposite the second locking groove 8b in the circumferential direction U. Adjacent rotary drive grooves 12a, 12b and locking grooves 8a, 8b are spaced approximately 90° apart in the circumferential direction.

[0086] Figures 11 to 13 show a tool holder 100. The tool holder 100 has a receiving opening 102 for an insertion end 4. The tool holder 100 has two radially displaceable locking elements 106 arranged in locking openings 104 for interacting with the axially closed locking grooves 8a, 8b. In addition, the tool holder 100 has at least two driving strips 108 for interacting with the rotary driving grooves 12a, 12b that are open axially towards the receiving-side end 6 of the insertion end 4. Furthermore, the tool holder 100 has two driving surfaces 110 for interacting with the rotary driving surfaces 14a, 14b that are open axially towards the receiving-side end 6 of the insertion end 4. The axial projection of the driving surfaces 110 overlaps the axial projection of the area of ​​the respective locking element 106 projecting into the receiving opening 102.

[0087] The driving strips 108 are diametrically opposed to one another in the axial direction A. The locking elements 106 are also diametrically opposed to one another in the axial direction A. The locking elements 106 can be designed as balls, as shown in Figure 13, or alternatively as rollers. The driving surfaces 110 are flat. The center connecting line of the driving surfaces 110 and the center connecting line of the locking opening 104 coincide. Furthermore, the longitudinal extent ML of the driving surfaces 110 and the driving strips 108 are at least approximately equal. Furthermore, the longitudinal extent ML is in particular 1.5 to 2.0 times the maximum axial play 112 of the insertion end 4.

[0088] Figures 14 to 16 show a tool holder 100 for receiving an insertion end 4 of Figures 5 to 10. The tool holder 100 has a receiving opening 102 for an insertion end 4. The tool holder 100 further has two radially displaceable locking elements 106 arranged in locking openings 104 for interacting with the axially closed locking grooves 8a, 8b. In addition, the tool holder 100 has at least two driving strips 108 for interacting with the rotary driving grooves 12a, 12b that are open axially towards the receiving-side front end 6 of the insertion end 4. Furthermore, the tool holder 100 has four driving surfaces 110. The driving surfaces 110 correspond to the rotary driving surfaces 14a, 14b, 15a, 15b.

[0089] Two of the four driving surfaces 110 are arranged adjacent to one another in the circumferential direction U. The axial projection of each two adjacent driving surfaces 110 at least partially overlaps the axial projection of a region of the respective locking element 106 that projects into the receiving opening 102. The driving surfaces 110 are formed symmetrically transversely to the longitudinal axis L. The driving surfaces 110 each have two flat flanks 122 running in the direction of the longitudinal axis. Adjacent flanks 122 of a driving surface 110 enclose an external angle 124 of 180° to 230° with respect to one another. Adjacent flanks 122 of adjacent driving surfaces 110 enclose an internal angle 126 of 80° to 120° with respect to one another. The driving strips 108 are at least approximately diametrically opposite one another in the axial direction A.The longitudinal extent ML of the driving surfaces 110 and the driving strips 108 is at least approximately equal and is in particular 1.5 to 2.0 times the maximum axial play 112 of the insertion end 4. The locking elements 106 are at least approximately diametrically opposite one another in the axial direction A.

[0090] List of reference symbols

[0091] 2 tool 4 insertion end 6 receiving end face 8a, b locking grooves 10 locking end 12a, b rotary driving grooves 14a, b first rotary driving surfaces 15a, b second rotary driving surfaces 16 circumferential groove outer edge 18 common edge 20 distance between the two rotary driving surfaces in radial direction 22 flanks of the rotary driving surface 24 outer angle of the flanks 26 inner angle between adjacent flanks 28 cylindrical surface section 30 flat surface 32 flat surface section 34 tangential force surface 36 elevations 100 tool holder 102 receiving opening 104 locking openings 106 locking element 108 driving strips 110 driving surfaces 112 maximum axial play of the insertion end 122 flanks 124 outer angle 126 inner angle A axial direction B width of the Rotary driving grooves D Guide diameter E Corner distance L Longitudinal axis LD Longitudinal extension of the rotary driving grooves LF Longitudinal extension of the rotary driving surfaces LN Longitudinal extension of the locking groove

[0092] ML Longitudinal extension of the driving surfaces

[0093] Q Transverse extension of the rotary driving surfaces

[0094] U Circumferential direction W Width of the locking grooves

Claims

Claims 1 . Insertion end (4) of a tool (2) driven in rotation about a longitudinal axis (L) and / or by impact, wherein the insertion end (4) extends along the longitudinal axis (L) starting from a receiving-side front end (6) of the tool (2) and has a maximum guide diameter (D), with at least two locking grooves (8a, 8b) running in the direction of the longitudinal axis (L) and spaced from one another in the circumferential direction (U), with a groove width (W) and a longitudinal extent (LN), wherein the locking grooves (8a, 8b) are designed to cooperate with at least one locking means of a tool holder (100), and wherein the locking grooves (8a, 8b) are closed in the axial direction (A) at a locking end (10) facing the receiving-side front end (6), and at least two locking grooves (8a, 8b) running in the direction of the longitudinal axis (L) and spaced from one another in the circumferential direction Rotary driving grooves (12a, 12b) which are designed toto cooperate with a respective rotary driving means of the same tool holder (100), wherein the rotary driving grooves (12a, 12b) extend axially from the holder-side front end (6) and are open towards the front end (6), wherein at least one locking groove (8a, 8b) is assigned a rotary driving surface (14a, 14b, 15a, 15b) which overlaps the respective locking groove (8a, 8b) and is designed to cooperate with a driving surface of the same tool holder (100), wherein the rotary driving surfaces (14a, 14b, 15a, 15b) have a longitudinal extension (LF) in the axial direction (A) starting from the holder-side front end, which is greater than the longitudinal extension (LN) of the respective locking groove (8a, 8b), wherein the locking grooves (8a, 8b) is assigned at least one first rotary driving surface (14a, 14b) and one second rotary driving surface (15a, 15b), and characterized in that the locking groove (8a,8b) associated first rotary driving surface (14a, 14b) and second rotary driving surface (15a, 15b) each have at least two flanks (22) extending in the direction of the longitudinal axis, which enclose an external angle (24) of 180 ° to 230 ° to each other., 2. Insert end (4) according to claim 1, characterized in that the rotary driving surfaces (14a, 14b, 15a, 15b) have a transverse extension (Q) transverse to the longitudinal axis (L) which is substantially equal to or greater than the groove width (W) of the locking grooves (8a, 8b).

3. Insert end (4) according to claim 1 or 2, characterized in that the longitudinal extent (LD) of the rotary driving grooves (12a, 12b) is substantially equal to the longitudinal extent (LF) of the rotary driving surfaces (14a, 14b, 15a, 15b).

4. Insertion end (4) according to one of the preceding claims, characterized in that the rotary driving surfaces (14a, 14b, 15a, 15b) have flat surface sections.

5. Insertion end (4) according to one of the preceding claims, characterized in that the rotary driving surfaces (14a, 14b, 15a, 15b) and a circumferential groove outer edge (16) of the locking grooves (8a, 8b) form a common edge (18).

6. Insertion end (4) according to one of the preceding claims, characterized in that the longitudinal extent (LF) of the rotary driving surfaces (14a, 14b, 15a, 15b) is 1.3 times to 1.8 times greater than the longitudinal extent (LN) of the locking grooves (8a, 8b).

7. Insert end (4) according to one of the preceding claims, characterized in that the longitudinal extent (LF) of the rotary driving surfaces (14a, 14b, 15a, 15b) and / or the rotary driving grooves (12a, 12b) is 3.0 to 3.8 times the guide diameter (D).

8. Insert end (4) according to one of the preceding claims, characterized in that the corner distance (E) between rotary driving surfaces (14a, 14b) and rotary driving grooves (12a, 12b) is at least 2.5 mm.

9. Insertion end (4) according to one of the preceding claims, characterized in that the rotary driving surfaces (14a, 15a) assigned to the first locking groove (8a) and those of the second locking groove (8b) associated rotary driving surfaces (14b, 15b) are formed symmetrically transversely to the longitudinal axis (L).

10. Insert end (4) according to one of the preceding claims, characterized in that flanks of the first rotary driving surface (14a, 14b) and the second rotary driving surface (15a, 15b) adjacent in the circumferential direction (U) enclose an internal angle (26) of 80° to 120° with respect to one another.

11. Insert end (4) according to one of the preceding claims, characterized in that a cylindrical surface section (28) is arranged between the flanks (22) of the first rotary driving surface (14a, 14b) and the second rotary driving surface (15a, 15b) which are adjacent in the circumferential direction (U), which cylindrical surface section (28) extends along the longitudinal extent (LF) of the rotary driving surfaces (14a, 14b, 15a, 15b) and is interrupted by the respective locking groove (8a, 8b), wherein the cylindrical surface section (28) axially adjoins the locking groove (8a, 8b) on both sides and forms elevations (36) extending radially outwards relative to the locking groove (8a, 8b).

12. Insert end (4) according to one of the preceding claims, characterized in that the four rotary driving surfaces (14a, 14b, 15a, 15b) form four pairs of flanks (22) and a total of eight flanks (22) in the circumferential direction (U).

13. A method for producing an insertion end (4) according to one of the preceding claims, characterized by the method steps: a) providing a cylindrical tool semi-finished product, b) inserting the semi-finished product into a die with partial reduction of the diameter of the semi-finished product, c) forming the rotary driving grooves (12a, 12b), d) forming the rotary driving surfaces (14a, 14b, 15a, 15b), e) Optionally, inserting the semi-finished product into a closing die and impressing the locking grooves (8a, 8b) by radially advancing two movable forming bodies located in the closing die, wherein the forming of the rotary driving grooves (12a, 12b) and rotary driving surfaces (14a, 14b, 15a, 15b) takes place in the same die.

14. Tool holder (100) with a receiving opening (102) for an insertion end (4) according to one of claims 1 to 12, characterized by at least one radially displaceable locking element (106) arranged in locking openings (104) for interacting with axially closed locking grooves (8a, 8b), at least two driving strips (108) for interacting with rotary driving grooves (12a, 12b) open axially towards the receiving-side end face (6) of the insertion end (4), and at least one driving surface (110) for interacting with rotary driving surfaces (14a, 14b, 15a, 15b) open axially towards the receiving-side end face (6) of the insertion end (4), wherein the axial projection of the driving surfaces (110) is the axial projection of the area of ​​the respective locking element (106) at least partially overlapped, wherein four driving surfaces (110) are provided,wherein two of the four driving surfaces (110) are arranged adjacent to one another in the circumferential direction (U), and wherein the axial projection of each two adjacent driving surfaces (110) at least partially overlaps the axial projection of a region of the respective locking element (106) projecting into the receiving opening (102), in particular wherein the driving surfaces (100) are formed symmetrically transversely to the longitudinal axis (L), characterized in that the driving surfaces (110) each have at least two, in particular flat, flanks (122) extending in the direction of the longitudinal axis, wherein adjacent flanks (122) of a driving surface (110) enclose an external angle (124) of 180° to 230° with respect to one another.

15. Tool holder (100) according to claim 14, characterized in that the driving strips (108) are at least approximately diametrically opposite one another in the axial direction (A).

16. Tool holder (100) according to one of claims 14 or 15, characterized in that the longitudinal extent (ML) of the driving surfaces (110) and the driving strips (108) is at least approximately equal and in particular amounts to 1.5 to 2.0 times the maximum axial play (112) of the insertion end (4).

17. Tool holder (100) according to one of claims 14 to 16, characterized in that the locking elements (106) are at least approximately diametrically opposed to one another in the axial direction (A).

18. Tool holder (100) according to one of claims 14 to 17, characterized in that adjacent flanks (122) of adjacent driving surfaces (110) enclose an internal angle (126) of 80° to 120° with respect to one another.

19. Use of a tool holder (100) according to one of claims 14 to 18 for receiving an insertion end (4) according to one of claims 1 to 12.

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