A device for transmitting torque from a drill to a drill bit

Abstract

The present invention relates to a device (10) for transmitting torque from a drill to a bit, having an insertion end (14) and a tool holder (13). The insertion end (14) has a first outer conical region, a groove region, and a second outer conical region, and has a first longitudinal groove and a second longitudinal groove. The tool holder (13) includes a body (41) having a first outer rotary drive groove, an intermediate element (42) having a first inner rotary drive, a second inner rotary drive, and a first outer rotary drive, and a locking device (43). In a connected state, the first inner rotary drive engages with the first longitudinal groove, the second inner rotary drive engages with the second longitudinal groove, and the first outer rotary drive engages with the first outer rotary drive groove.

Description

[Technical field]

[0001] The present invention relates to a device for transmitting torque from a drill to a drill bit according to the preamble of claim 1. [Background technology]

[0002] Patent document 1 discloses a known device for transmitting torque from a drill to a drill bit. The device for transmitting torque is arranged between the drill and the drill bit and transmits a torque generated by a drill motor of the drill to the drill bit. The device for transmitting torque comprises a tool coupling permanently connected to the drill or connected via a releasable connection to the drill, and a shank permanently connected to the drill bit or connected via a releasable connection to the drill bit.

[0003] The shank is configured in a sleeve-like manner from a first outer conical region, a groove region, a second outer conical region, and a cylindrical region, and includes a plurality of first longitudinal grooves extending across the first outer conical region, the groove region, the second outer conical region, and the cylindrical region, and a plurality of second longitudinal grooves extending across the second outer conical region and the cylindrical region. The number of the plurality of first longitudinal grooves is the same as the number of the plurality of second longitudinal grooves. The second longitudinal grooves are different from the first longitudinal grooves in that the second longitudinal grooves are limited to the second outer conical region and the cylindrical region, and do not extend to the first outer conical region and the groove region.

[0004] The tool joint is composed of three parts: a base body, an intermediate element and a locking device, which is adjustable parallel to the longitudinal axis of the tool joint between a receiving position and a locking position, in which the shank is insertable into the tool joint and in which the shank is connected to the tool joint.

[0005] The intermediate element is an annularly designed intermediate element with an inner drive area with a plurality of first inner rotary drives having a first width and a first depth and a plurality of second inner rotary drives having a second width and a second depth, and an outer drive area with a plurality of first outer rotary drives having a third width and a third depth. The number of the plurality of first inner rotary drives, the number of the plurality of second inner rotary drives and the number of the plurality of first outer rotary drives are equal. The base body is a sleeve-like base body with an inner conical area and a rotary drive area with a plurality of first outer rotary drive grooves.

[0006] In the connected state of the tool joint and the shank, the first inner rotary drive of the intermediate element engages in the first longitudinal groove of the shank, the second inner rotary drive of the intermediate element engages in the second longitudinal groove of the shank, and the first outer rotary drive of the intermediate element engages in the first outer rotary drive groove. The torque generated by the drill motor of the drill is transmitted to the shank by the first inner rotary drive and the second inner rotary drive.

[0007] The device for transmitting torque known from DE 10 200 03 133 A1 has the disadvantage that the tool joint and the shank are only permitted for drills with a power of up to about 2.5 kW. At high powers, the surface pressures become very high, which can damage the inner and outer rotary drives of the tool joint. In addition, the life of the tool joint and the life of the shank are shortened. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] European Patent No. 1211005 Summary of the Invention [Problem to be solved by the invention]

[0009] The object of the present invention is to further develop the tool joint and the shank of the device for transmitting torque known from WO 2006 / 023111, so that the new device is able to transmit higher torques than the conventional device, the new shank can be connected to the conventional tool joint and the new tool joint cannot be connected to the conventional shank. [Means for solving the problem]

[0010] The above object is achieved according to the invention in the case of a device for transmitting torque as mentioned at the outset by the features of independent claim 1. Advantageous embodiments are specified in the dependent claims.

[0011] According to the invention, it is provided that the first depth of the first inner rotary drive and the second depth of the second inner rotary drive are the same and the second longitudinal groove of the shank also extends over the first outer conical area and the groove area. Due to the fact that the second depth of the second inner rotary drive is the same as the first depth of the first inner rotary drive in the case of the new tool joint, the second inner rotary drive in the case of the new tool joint has a second depth that is larger than in the case of the conventional tool joint. The larger second depth of the second inner rotary drive increases the contact area between the new tool joint and the new shank, which allows to transmit a higher torque from the drill to the drill bit.

[0012] The larger second depth of the second inner rotary drive prevents the new tool joint designed for more powerful drills from being connectable to conventional shanks, which are only permitted for drills with a power output of up to about 2.5 kW, thus improving the operational safety of the drill. Since the second longitudinal groove of the conventional shank extends only over the second outer conical region and has a small depth, the second inner rotary drive of the new tool joint is too deep to be inserted into the second longitudinal groove of the conventional shank.

[0013] The second longitudinal groove, which in the case of the new shank extends across the first outer conical region, the groove region and the second outer conical region, has a greater depth than the second longitudinal groove of the conventional shank. This means that the new shank can be connected to a conventional tool joint. The second inner rotary drive of the conventional intermediate element engages with the second longitudinal groove of the new shank. The new shank is designed for powerful drills and is capable of greater forces and torques than conventional tool joints, but this is not essential for operation. Operating the shank with less power or torque than the maximum allowed may have a positive effect on the life of the shank.

[0014] Preferably, the first width of the first inner rotary drive and the second width of the second inner rotary drive are the same. The first inner rotary drive and the second inner rotary drive are the same depth and have the same width, which has the advantage that it is not necessary to assign the first inner rotary drive to a first longitudinal groove or the second inner rotary drive to a second longitudinal groove. Each inner rotary drive can be inserted into any longitudinal groove.

[0015] Preferably, the intermediate element has a plurality of second outer rotary drives having a fourth width and a fourth depth, the rotary drive area has a plurality of second outer rotary drive grooves, and in the connected state of the device, the second outer rotary drives engage with the second outer rotary drive grooves. The second outer rotary drives increase the contact area between the base and the intermediate element, thereby allowing the transmission of greater forces and torques. The larger the contact area, the lower the surface pressure between the base and the intermediate element, or, if the surface pressure remains the same, greater forces and torques can be transmitted over a larger contact area.

[0016] Particularly preferably, the second outer rotary drive is aligned with the second inner rotary drive of the intermediate element in a plane perpendicular to the longitudinal axis of the tool joint. The second outer rotary drive increases the contact area between the base body and the intermediate element, which allows the transmission of larger forces and torques if the surface pressure remains the same. Due to the fact that the second outer rotary drive is aligned with the second inner rotary drive of the intermediate element, the forces are transmitted from the tool joint to the shank by the shortest path. The forces or torques are transmitted from the outer rotary drive groove in the rotary drive area of ​​the base body to the outer rotary drive of the intermediate element and then by the inner rotary drive of the intermediate element to the longitudinal groove of the shank.

[0017] Preferably, the third depth of the first outer rotary drive and the fourth depth of the second outer rotary drive are the same. The same depth and same width of the first outer rotary drive and the second outer rotary drive has the advantage that forces or torques can be uniformly transmitted from the base body to the intermediate element via the first outer rotary drive and the second outer rotary drive.

[0018] Particularly preferably, the third depth of the first outer rotary drive and the fourth depth of the second outer rotary drive are the same. The same depth and the same width of the first and second outer rotary drives has the advantage that forces or torques can be uniformly transmitted from the base body to the intermediate element via the first and second outer rotary drives. In addition, there is no need to assign the first outer rotary drive to the first outer rotary drive groove or the second outer rotary drive to the second outer rotary drive groove. Each outer rotary drive can be inserted into any outer rotary drive groove.

[0019] In a preferred modified embodiment, the intermediate element is an annularly designed intermediate element having an inner surface, an outer surface and a base surface, a number of lower rotary drives are arranged on the base surface of the intermediate element and a number of lower rotary drive grooves are arranged on the annular shoulder of the base body, with which the lower rotary drives interact in the connected state of the tool joint. The lower rotary drives interacting with the rotary drive grooves of the annular shoulder increase the contact area between the base body and the intermediate element without increasing the height of the rotary drive area, thus allowing the transmission of greater forces and torques if the contact pressure remains the same.

[0020] Arranging the lower rotary drive on the base surface of the intermediate element has the advantage that the loads on the intermediate element are better distributed, which may lead to a longer service life of the intermediate element. The forces transmitted from the first and second lower rotary drives to the first and second inner rotary drives run mainly parallel to the longitudinal axis of the tool joint, whereas the forces transmitted from the first and second outer rotary drives to the first and second inner rotary drives run mainly in a plane perpendicular to the longitudinal axis of the tool joint.

[0021] Preferably, the lower rotary drive comprises a plurality of first lower rotary drives having a fifth width and a fifth depth, and the lower rotary drive groove comprises a plurality of first lower rotary drive grooves, and in the connected state of the device, the first lower rotary drives interact with the first lower rotary drive grooves. The formation of the first lower rotary drive and the arrangement of the first lower rotary drive on the base surface of the intermediate element has the advantage that the contact area between the base and the intermediate element is increased without increasing the height of the rotary drive area, and in addition, the load on the intermediate element is transferred to another area.

[0022] Particularly preferably, the first lower rotary drive is aligned with the first inner rotary drive of the intermediate element in a plane perpendicular to the longitudinal axis of the tool joint. Due to the fact that the first lower rotary drive is aligned with the first inner rotary drive, forces are transmitted from the tool joint to the shank via the shortest path.

[0023] Preferably, the lower rotary drive comprises a plurality of second lower rotary drives having a sixth width and a sixth depth, and the lower rotary drive groove comprises a plurality of second lower rotary drive grooves, and the second lower rotary drive interacts with the second lower rotary drive grooves. The formation of the second lower rotary drive and the arrangement of the second lower rotary drive on the base surface of the intermediate element has the advantage that the contact area between the base and the intermediate element is increased without increasing the height of the rotary drive area, and in addition, the load on the intermediate element is transferred to another area.

[0024] Particularly preferably, the second lower rotary drive is aligned with the second inner rotary drive of the intermediate element in a plane perpendicular to the longitudinal axis of the tool joint. Due to the fact that the second lower rotary drive is aligned with the second inner rotary drive, the forces are transmitted from the tool joint to the shank via the shortest path.

[0025] Particularly preferably, the fifth depth of the first lower rotary drive and the sixth depth of the second lower rotary drive are the same. The same depth of the first lower rotary drive and the second lower rotary drive has the advantage that forces or torques are transmitted uniformly from the base body to the intermediate element via the first lower rotary drive and the second lower rotary drive.

[0026] Particularly preferably, the fifth width of the first lower rotary drive and the sixth width of the second lower rotary drive are the same. The same depth and width of the first and second lower rotary drives has the advantage that forces or torques can be uniformly transmitted from the base body to the intermediate element via the first and second lower rotary drives. In addition, there is no need to assign the first lower rotary drive to the first lower rotary drive groove or the second lower rotary drive to the second lower rotary drive groove.

[0027] The embodiments of the present invention are described below with reference to the drawings. It is not necessarily intended to show the embodiments to scale here, rather the drawings are represented in a schematic and / or slightly modified form if useful for explanation. It should be considered here that various modifications and changes can be made in relation to the embodiments and their details without departing from the general concept of the present invention. The general concept of the present invention is not limited to the exact form or details of the preferred embodiments shown and described below, or to the technical scope that may be limited compared to the technical scope claimed in the claims. For a given dimensional range, values ​​within the mentioned limits shall also be disclosed as limit values ​​and may be used and claimed as desired. For simplicity, the same reference numbers are used below for the same or similar parts, or parts having the same or similar functions. [Brief description of the drawings]

[0028] [Figure 1] FIG. 2 shows a device for transmitting torque from a drill to a drill bit according to the invention, comprising a tool joint connected to the drill and a shank connected to the drill bit. [Figure 2A] 2 shows a tool joint of the device for transmitting torque shown in FIG. 1 according to the invention; [Figure 2B] 2 shows a shank of the device for transmitting torque shown in FIG. 1 according to the invention; [Figure 3A] FIG. 2 is a side view of the shank of a device for transmitting torque according to the present invention. [Figure 3B] 3B is a longitudinal section through the shank of a device for transmitting torque according to the invention, taken along section AA of FIG. 3A. [Figure 4A] 2B is a side view of the device for transmitting torque of FIG. 1 in a connected state in which the shank of FIG. 2B is connected to the tool joint of FIG. 2A according to the present invention; [Figure 4B]4A shows a longitudinal section through the device for transmitting torque according to FIG. 1 in a connected state, in which the shank according to FIG. 2B is connected to the tool joint according to FIG. 2A, along the section AA of FIG. 4A. [Figure 5A] FIG. 2 is a side view of the base body of the tool joint; [Figure 5B] FIG. 5B is a longitudinal sectional view of the base body of the tool joint taken along section AA of FIG. 5A. [Figure 5C] FIG. 2 is a plan view of the interface of the basic body of the tool joint with the intermediate element of the tool joint; [Figure 6A] FIG. 2 is a side view of the intermediate element of the tool joint; [Figure 6B] FIG. 6B is a longitudinal section through the intermediate element of the tool joint along section AA of FIG. 6A. [Figure 6C] FIG. 2 is a plan view showing the interface of the intermediate element of the tool joint with the base body; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] 1 shows a device 10 according to the invention for transmitting torque from a drill 11 to a drill bit 12. The device 10 is arranged between the drill 11 and the drill bit 12 and transmits torque from the drill 11 to the drill bit 12.

[0030] The device 10 consists of a tool fitting 13 connected to a drill 11 and a shank 14 connected to a drill bit 12. The device 10 is connected to the drill 11 via a first connection 15 and to the drill bit 12 via a second connection 16. In the connected state of the device 10, torque is transmitted via the following components: the drive shaft 17 of the drill 11, the tool fitting 13, the shank 14 and the drill bit 12. The connected state of the device 10 is defined as the state in which the tool fitting 13 and the shank 14 are connected.

[0031] 2A and 2B show a drill 11 (FIG. 2A) with a tool joint 13 of a device 10 according to the invention and a drill bit 12 (FIG. 2B) with a shank 14. In the connected state, the tool joint 13 and the shank 14 form the device 10 according to the invention of FIG.

[0032] The tool coupling 13 is connected to the drill 11 via a first connection 15, which in the example is designed as a releasable connection. Alternatively, the tool coupling 13 can be connected to the drill 11 via a non-releasable first connection 15. Since the tool coupling 13 is a wear part, it makes sense to design the tool coupling 13 as a separate component and to connect it to the drive shaft 17 of the drill 11 via a releasable first connection. To ensure that the drill 11 is only operated with the approved tool coupling 13, it makes sense to design the first connection 15 in such a way that it can only be operated with a special tool.

[0033] The shank 14 is connected to the drill bit 12 via a second connection 16, which in the embodiment is designed as a releasable connection. For this purpose, the drill bit 12 has an internal thread that is connected to the external thread of the shank 14. The releasable second connection 16 is designed, for example, as a metric ISO thread connection or another releasable connection. Instead of a releasable second connection 16, the shank 14 can be non-releasably connected to the drill bit 12. For this purpose, the shank 14 can be non-releasably connected to the drill bit 12, for example by welding or in another way.

[0034] The drive shaft 17 is designed such that, in the connected state of the tool joint 13 and the drill 11, it can rotate about a first axis of rotation 21, which coincides with the longitudinal axis 22 of the tool joint 13. The drill bit 12 is designed such that, in the connected state of the shank 14 and the drill bit 12, it can rotate during operation about a second axis of rotation 23, which coincides with the longitudinal axis 24 of the shank 14. For the sake of distinction, the longitudinal axis 22 of the tool joint 13 is called the first longitudinal axis 22 and the longitudinal axis 24 of the shank 14 is called the second longitudinal axis 24. In the connected state of the drill 11 and the drill bit 12, the first longitudinal axis 22 and the second longitudinal axis 24 are arranged coaxially with each other.

[0035] 3A and 3B show the shank 14 of the device 10 for transmitting torque according to the invention in a side view (FIG. 3A) and in a longitudinal section along section AA of FIG. 3A (FIG. 3B), in the unconnected state of the device 10. The shank 14 is made up of a first part 26 and a second part 27, which in the embodiment are integrally formed and have a central through hole 28.

[0036] The second part 27 of the shank 14 has an external thread 29 and forms the second threaded connection 16 with the matching internal thread of the drill bit 12. The first part 26 of the shank 14 is made up of five parts and comprises a front region 32, a first outer conical region 33, a groove region 34, a second outer conical region 35 and a cylindrical region 36. The first outer conical region 33 and the second outer conical region 35 have a first or second outer conical surface which expands in the direction of the drill bit 12. The conical surface is manufactured, for example, by turning. By manufacturing the first and second outer conical surfaces in one go, a high manufacturing precision can be achieved.

[0037] The shank 14 has a plurality of first longitudinal grooves 37 and a plurality of second longitudinal grooves 38 extending parallel to the second longitudinal axis 24 of the shank 14 and arranged on the outside of the first portion 26. The first longitudinal grooves 37 and the second longitudinal grooves 38 are formed identically in the embodiment and extend over the first outer conical region 33, the groove region 34 and the second outer conical region 35, as well as over the cylindrical region 36. The first longitudinal grooves 37 and the second longitudinal grooves 38 are uniformly distributed and alternately arranged in the circumferential direction 39 of the shank 14, with each first longitudinal groove 37 being arranged between two second longitudinal grooves 38. In the embodiment, the shank 14 has three first longitudinal grooves 37 and three second longitudinal grooves 38, and generally, the number of the plurality of first longitudinal grooves 37 is the same as the number of the plurality of second longitudinal grooves 38.

[0038] 4A and 4B show a device 10 for transmitting torque according to the present invention in a connected state in which a shank 14 is connected to a tool joint 13, in a side view (FIG. 4A) and in a longitudinal section along section AA of FIG. 4A (FIG. 4B).

[0039] The tool joint 13 consists of a base body 41, an intermediate element 42 and a locking device 43. The intermediate element 42 forms the interface between the tool joint 13 and the shank 14, and torque is transmitted from the intermediate element 42 to the shank 14. The connected state of the tool joint 13 is defined as the state in which the base body 41, the intermediate element 42 and the locking device 43 are connected.

[0040] The locking device 43 is designed to be adjustable relative to the base body 41, in that the locking device 43 is displaceable in a longitudinal direction 44 running parallel to the first longitudinal axis 22 of the tool joint 13 and is rotatable about the first longitudinal axis 22. The locking device 43 is adjustable between a number of positions, called a basic position, a receiving position and a locking position. To be able to connect the shank 14 to the tool joint 13 with a transition fit, the locking device 43 is moved in the longitudinal direction 44 from the basic position to the receiving position. In the receiving position, the shank 14 is inserted into the tool joint 13. To lock the device 10, the locking device 43 is rotated about the first longitudinal axis 22 up to the locking position. In the process, the locking element 45 engages in the groove area 34 of the shank 14 and locks the shank 14 to the tool joint 13. The basic position of the locking device 43 is optional and can be omitted. The receiving and locking positions of the locking device 43 are mandatory.

[0041] 5A to 5C show the base body 41 of the tool joint 13 in a side view (FIG. 5A), a longitudinal section along section AA of FIG. 5A (FIG. 5B), and a plan view of the interface with the intermediate element 42 (FIG. 5C).

[0042] The base body 41 is a sleeve-like base body with a central through hole 47 and is made up of several parts, which in the embodiment are made in one piece. In addition to the internal thread, the base body 41 comprises an internal conical region 48 which interacts with the shank 14 and a rotational drive region 49 which interacts with the intermediate element 42. The internal conical region 48 has a conical inner surface which expands in the direction of the drill. In the connected state of the device 10, the internal conical region 48 of the base body 41 and the first and second external conical regions 33, 35 of the shank 14 form an intermediate fit connection.

[0043] The rotary drive region 49 is formed in a stepped manner from the annular collar 51 and the annular shoulder 52. A first outer rotary drive groove 53 and a second outer rotary drive groove 54 are provided in the annular collar 51, said grooves interacting with the first outer rotary drive part and the second outer rotary drive part of the intermediate element 42 in the connected state of the tool joint 13, and a first lower rotary drive groove 55 and a second lower rotary drive groove 56 are provided in the annular shoulder 51, said grooves interacting with the first lower rotary drive part and the second lower rotary drive part of the intermediate element 42 in the connected state of the device 10. The first outer rotary drive groove 53 and the second outer rotary drive groove 54 are collectively referred to by the term "outer rotary drive grooves", and the first lower rotary drive groove 55 and the second lower rotary drive groove 56 are collectively referred to by the term "lower rotary drive grooves".

[0044] The first outer rotary drive grooves 54 and the second outer rotary drive grooves 55 are uniformly distributed and alternately arranged in the circumferential direction 57 of the base body 41 at the annular collar 51 of the rotary drive region 49, with each first outer rotary drive groove 55 being located between two second outer rotary drive grooves 56. The first lower rotary drive grooves 56 and the second lower rotary drive grooves 57 are uniformly distributed and alternately arranged in the circumferential direction 57 of the base body 41 at the annular shoulder 52, with each first lower rotary drive groove 55 being located between two second lower rotary drive grooves 56.

[0045] In an embodiment, the annular collar 51 has three first outer rotary drive grooves 53 and three second outer rotary drive grooves 54, and the annular shoulder 52 has three first lower rotary drive grooves 55 and three second lower rotary drive grooves 56, and generally, the number of the plurality of first outer rotary drive grooves 53 is the same as the number of the plurality of second outer rotary drive grooves 54, and the number of the plurality of first lower rotary drive grooves 55 is the same as the number of the plurality of second lower rotary drive grooves 56.

[0046] 6A-6C show the intermediate element 42 of the tool joint 13 in a side view (FIG. 6A), a longitudinal section along section AA of FIG. 6A (FIG. 6B), and a plan view of the interface with the base body 41 (FIG. 6C). In the connected state of the device 10, the intermediate element 42 is disposed between the base body 41 and the shank 14, and torque is transmitted from the base body 41 to the shank 14 via the intermediate element 42.

[0047] The intermediate element 42 is an annularly designed intermediate element having a base surface 61, an inner side surface 62 and an outer side surface 63. The inner side surface 62 forms an inner drive area and the outer side surface 63 forms an outer drive area. At the inner side surface 62, the intermediate element 42 has a plurality of first inner rotary drives 64 and a plurality of second inner rotary drives 65 which, in the connected state of the device 10, engage in the first longitudinal grooves 37 and the second longitudinal grooves 38 of the shank 14. On its outer surface 63, the intermediate element 42 has a plurality of first outer rotary drive portions 66 and a plurality of second outer rotary drive portions 67, which, in the connected state of the tool joint 13, engage with first outer rotary drive grooves 53 and second outer rotary drive grooves 54 on the annular collar 51 of the basic body 41.

[0048] The first inner rotary drive 64 and the second inner rotary drive 65 are collectively referred to by the term "inner rotary drive". Perpendicular to the first longitudinal axis 22 of the tool joint 13, the first inner rotary drive 64 has a first width B1 and a first depth T1, and the second inner rotary drive 65 has a second width B2 and a second depth T2. Parallel to the first longitudinal axis 22 of the tool joint 13, the first inner rotary drive 64 extends over a first height H1 and the second inner rotary drive 65 extends over a second height H2. In order to set the surface pressure between the intermediate element 42 and the shank 14 as small as possible, the first height H1 and the second height H2 are made as large as possible.

[0049] The first outer rotary drive 66 and the second outer rotary drive 67 are collectively referred to by the term "outer rotary drives". Perpendicular to the first longitudinal axis 22 of the tool joint 13, the first outer rotary drive 66 has a third width B3 and a third depth T3, and the second outer rotary drive 67 has a fourth width B4 and a fourth depth T4. Parallel to the first longitudinal axis 22 of the tool joint 13, the first outer rotary drive 66 has a third height H3 and the second outer rotary drive 67 has a fourth height H4. In order to set the surface pressure between the basic body 41 and the intermediate element 42 as small as possible, the third height H3 and the fourth height H4 are made as large as possible.

[0050] The first outer rotary drive 66 and the second outer rotary drive 67 are aligned with the first inner rotary drive 64 and the second inner rotary drive 65, respectively, in a plane 68 perpendicular to the first longitudinal axis 22 of the tool joint 13. This arrangement has the advantage that the forces are transmitted directly from the base body 41 to the shank 14. In the connected state of the device 10, the forces flow on the first outer rotary drive 66 and the second outer rotary drive 67 on the outer surface 63 of the intermediate element 42. The forces are transmitted via the intermediate element 42 to the first inner rotary drive 64 and the second inner rotary drive 65 on the inner surface 62 of the intermediate element 42, where the first inner rotary drive 64 transmits the force to the first longitudinal groove 37 and the second inner rotary drive 65 transmits the force to the second longitudinal groove 38.

[0051] In addition to the inner rotary drives 64, 65 and the outer rotary drives 66, 67, the intermediate element 42 has a plurality of first lower rotary drives 71 and a plurality of second lower rotary drives 72, which are arranged on the base surface 61 of the intermediate element 42 and merge into the first inner rotary drive 64 and the second inner rotary drive 65, respectively. The first lower rotary drive 71 merges into the first inner rotary drive 64 and the second lower rotary drive 72 merges into the second inner rotary drive 65.

[0052] The first lower rotary drive 71 and the second lower rotary drive 72 are collectively referred to by the term "lower rotary drive". Perpendicular to the first longitudinal axis 22 of the tool joint 13, the first lower rotary drive 71 has a fifth width B5 and a fifth depth T5, and the second lower rotary drive 72 has a sixth width B6 and a sixth depth T6. Parallel to the first longitudinal axis 22 of the tool joint 13, the first lower rotary drive 71 has a fifth height H5, and the second lower rotary drive 72 has a sixth height H6. In order to set the surface pressure between the base body 41 and the intermediate element 42 as small as possible, the fifth height H5 and the sixth height H6 are made as large as possible.

[0053] The intermediate element 42 shown in the example has all the rotary drives designed as the first inner rotary drive 64 and the second inner rotary drive 65, as the first outer rotary drive 66 and the second outer rotary drive 67 and as the first lower rotary drive 71 and the second lower rotary drive 72. The second outer rotary drive 67 and the first lower rotary drive 71 and the second lower rotary drive 72 are optional. The contact area between the base body 41 and the intermediate element 42 is increased by the second outer rotary drive 67 and the first lower rotary drive 71 and the second lower rotary drive 72.

[0054] In the new tool joint 13, the first depth T1 of the first inner rotary drive 64 is the same as the second depth T2 of the second inner rotary drive 65. In the conventional tool joint, the second depth of the second inner rotary drive is smaller than the first depth of the first inner rotary drive. The larger second depth of the second inner rotary drive increases the contact area between the new tool joint and the new shank, allowing to transmit more forces and torques from the drill to the drill bit. The same depth (T1=T2) of the first inner rotary drive 64 and the second inner rotary drive 65 also has the advantage that the new tool joint cannot be combined with the conventional shank, since the dimension of the second longitudinal groove 38 in the plane perpendicular to the second longitudinal axis 24 of the shank 14 is too small to be combined with the second inner rotary drive 65.

[0055] In the embodiment of the device 10, the first width B1 of the first inner rotary drive 64 is the same as the second width B2 of the second inner rotary drive 65. In the conventional tool joint, the second width of the second inner rotary drive is smaller than in the new tool joint. The first inner rotary drive 64 and the second inner rotary drive 65 have the advantage that they have the same depth (T1=T2) and the same width (B1=B2), that is, it is not necessary to assign the first inner rotary drive 64 to the first longitudinal groove 37 or the second inner rotary drive 65 to the second longitudinal groove 38.

[0056] The novel tool joint 13 shown in the example differs from the conventional tool joint in that the novel tool joint 13 has a second outer rotary drive 67 and a second outer rotary drive groove 54. In the connected state of the device 10, the second outer rotary drive 67 engages with the second outer rotary drive groove 54 of the base body 41. The second outer rotary drive 67 and the rotary drive groove 54 increase the contact area between the base body 41 and the intermediate element 42, thereby allowing the transmission of larger forces and torques. The larger the contact area, the lower the surface pressure between the base body 41 and the intermediate element 42, or if the surface pressure remains the same, larger forces and torques can be transmitted over a larger contact area.

[0057] In the embodiment of the device 10, the third depth T3 of the first outer rotary drive 66 is the same as the fourth depth T4 of the second outer rotary drive 67. The same depths of the first outer rotary drive 66 and the second outer rotary drive 67 (T3=T4) have the advantage that the force or torque is uniformly transmitted from the base body 41 to the intermediate element 42 via the first outer rotary drive 66 and the second outer rotary drive 67. In addition, in the embodiment of the device 10, the third width of the first outer rotary drive 66 and the fourth width of the second outer rotary drive 67 are the same. The same depths of the first outer rotary drive 66 and the second outer rotary drive 67 (T3=T4) and the same widths (B3=B4) have the advantage that it is not necessary to assign the first outer rotary drive 66 to the first outer rotary drive groove 53 or the second outer rotary drive 67 to the second outer rotary drive groove 54. Each outer rotary drive part may be inserted into any of the outer rotary drive grooves.

[0058] The novel tool joint 13 shown in the embodiment differs from the conventional tool joint in that it has lower rotary drives 71, 72 and lower rotary drive grooves 55, 56. The design of the first and second lower rotary drives 71, 72 and their arrangement on the base surface 61 of the intermediate element 42 has the advantage that the contact area between the base body 41 and the intermediate element 42 is increased without increasing the height of the rotary drive region 49. In addition, the load on the intermediate element 42 is transferred to other areas. The force flows occurring when transmitting forces from the first outer rotary drive 66 and the second outer rotary drive 67 to the first inner rotary drive 64 or the second inner rotary drive 65 run mainly in a plane 68 perpendicular to the first longitudinal axis 22 of the tool joint 13, while the force flows occurring when transmitting forces from the first lower rotary drive 71 and the second lower rotary drive 72 to the first inner rotary drive 64 and the second inner rotary drive 65, respectively, run mainly parallel to the first longitudinal axis 22 of the tool joint 13. The load on the intermediate element 42 is better distributed, which leads to a longer service life of the intermediate element 42.

[0059] In the embodiment of the device 10, the fifth depth T5 of the first lower rotary drive 71 is the same as the sixth depth T6 of the second lower rotary drive 72. The same depths of the first lower rotary drive 71 and the second lower rotary drive 72 (T5=T6) have the advantage that the force or torque is uniformly transmitted from the base body 41 to the intermediate element 42 via the first lower rotary drive 71 and the second lower rotary drive 72. In addition, in the embodiment of the device 10, the fifth width B5 of the first lower rotary drive 71 is the same as the sixth width B6 of the second lower rotary drive 72. The first lower rotary drive 71 and the second lower rotary drive 72 having the same depth (T5=T6) and the same width (B5=B6) has the advantage that the force or torque can be uniformly distributed from the base body 41 to the intermediate element 42 via the first lower rotary drive 71 and the second lower rotary drive 72, and in addition, there is the advantage that it is not necessary to assign the first lower rotary drive 71 to the first lower rotary drive groove 55 or the second lower rotary drive 72 to the second lower rotary drive groove 56.

Claims

1. a shank (14) configured in the shape of a sleeve and having a first outer conical region (33), a groove region (34) and a second outer conical region (35) extending in sequence along a longitudinal axis (24), a plurality of first longitudinal grooves (37) extending across the first outer conical region (33), the groove region (34) and the second outer conical region (35) and a plurality of second longitudinal grooves (38) extending across the second outer conical region (35), wherein the number of the plurality of first longitudinal grooves (37) is three, the number of the plurality of second longitudinal grooves (38) is three, and the first longitudinal grooves (37) and the second longitudinal grooves (38) are alternately and evenly arranged in the circumferential direction, respectively; A tool joint (13) having a base body (41), an intermediate element (42) and a locking device (43), said intermediate element (42) has a first width (B １ ) and the first depth (T １ a plurality of first inner rotary drives (64) having a second width (B ２ ) and the second depth (T ２ a plurality of second inner rotary drives (65) having a third width (B ３ ) and the third depth (T ３ and a plurality of first outer rotary drives (66) having a first outer rotary drive portion (66) and a second outer rotary drive portion ... - the basic body (41) has an inner conical region (48) and a rotary drive region (49) with a plurality of first external rotary drive grooves (53), in which, in the connected state of the tool joint (13), the first external rotary drive part (66) of the intermediate element (42) engages with the first external rotary drive grooves (53), a tool joint (13), in which the locking device (43) is adjustable parallel to the longitudinal axis (22) of the tool joint (13) between a receiving position and a locking position, and in which the shank (14) is insertable into the tool joint (13) in the receiving position and is connected to the tool joint (13) in the locking position; A device (10) for transmitting a torque generated by a drill (11) to a drill bit (12), comprising: In a connected state of the device (10), the first inner rotary drive (64) of the intermediate element (42) engages in the first longitudinal groove (37) of the shank (14) and the second inner rotary drive (65) of the intermediate element (42) engages in the second longitudinal groove (38) of the shank (14), The first depth (T １ ) and the second depth (T ２ ) are the same, and the second longitudinal groove (38) of the shank (14) also extends across the first outer conical region (33) and the groove region (34). A device characterized in that

2. The first width (B １ ) and the second width (B ２ 2. The device of claim 1, wherein:

3. The intermediate element (42) has a fourth width (B ４ ) and the fourth depth (T ４ 3. The device according to claim 1, characterized in that the rotary drive region (49) has a plurality of second outer rotary drive grooves (54) and in the connected state of the device (10), the second outer rotary drive grooves (54) engage with the second outer rotary drive grooves (54).

4. 4. The device according to claim 3, characterized in that the second outer rotary drive (67) is aligned with the second inner rotary drive (65) of the intermediate element (42) in a plane (68) perpendicular to the longitudinal axis (22) of the tool joint (13).

5. The third depth (T ３ ) and the fourth depth (T ４ 5. The device according to claim 3, wherein:

6. The third width (B ３ ) and the fourth width (B ４ 6. The device according to claim 5, wherein:

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