Arrangement for the force-locking connection of an adapter shaft with a shaft by means of a clamping ring

Abstract

Arrangement for the force-locking connection of an adapter shaft (1) to a shaft by means of a clamping ring (4), wherein the clamping ring (4) is placed on the adapter shaft (1), wherein the shaft is inserted into the adapter shaft (1), wherein the clamping ring (4) has a radially continuous threaded bore into which a screw part is screwed, which presses on the adapter shaft (1), wherein a cylinder bolt (3) is received in a first recess of the clamping ring (4), which projects radially inward into a second recess which is made in the adapter shaft (1), characterized in that the cylinder bolt (3) is designed as a disc.

Description

[0001] The invention relates to an arrangement for the non-positive connection of an adapter shaft to a shaft by means of a clamping ring.

[0002] From US 2 221 371 A a connection of an adapter shaft to a shaft by means of a clamping ring is known.

[0003] WO 2014 / 187 540 A1 discloses a shaft-hub connection for a geared motor as the closest prior art.

[0004] The invention is therefore based on the object of developing a force-locking connection between the shaft and the adapter shaft.

[0005] According to the invention, the object is achieved by the arrangement according to the features specified in claim 1.

[0006] Important features of the invention in the arrangement for the force-locking connection of an adapter shaft to a shaft by means of a clamping ring are that the clamping ring is placed on the adapter shaft, where the shaft is inserted into the adapter shaft, wherein the clamping ring has a radially continuous threaded bore into which a screw part, in particular a threaded pin, is screwed, which presses on the adapter shaft, wherein a cylinder bolt is received in a first recess of the clamping ring, which projects radially inward into a second recess which is made in the adapter shaft, in particular projects into it, in particular to form a loss prevention and rotation prevention device acting in the axial direction and in the circumferential direction.

[0007] The advantage here is that a captive locking device is formed, particularly in both the axial and circumferential directions. The invention is easy to implement and requires no additional special means, with the exception of the cylinder bolt, i.e., a circular disk-like part. A recess is provided on the adapter shaft as well as on the clamping ring so that the cylinder bolt can be accommodated in both recesses.

[0008] Due to the axial slots, the adapter shaft can be elastically deflected and thus pressed against the hollow shaft as soon as the threaded pin presses against the adapter shaft. This causes the adapter shaft to contract, or in particular, shrink. A threaded hole through the clamping ring is provided for the threaded pin. The recesses, however, are not continuous, particularly not on the adapter shaft or the clamping ring.

[0009] Thus, the invention improves the security of a force-locking connection between the shaft and the adapter shaft by using a clamping ring for contracting, in particular shrinking, the adapter shaft having a hollow shaft region, which clamping ring is arranged on the adapter shaft in a captive manner, in particular in the axial direction and in the circumferential direction.

[0010] Shrinkage is not understood here as a thermally induced contraction, but as a mechanically induced contraction.

[0011] In an advantageous embodiment, the adapter shaft has axial slots, in particular axial slots spaced apart in the circumferential direction, in particular axial slots regularly spaced apart in the circumferential direction. This is advantageous in that the adapter shaft can be deformed without great effort and that the deformation does not allow the formation of waves in the circumferential direction. Without axial slots, there would be a risk that the adapter shaft would not form radially directed sine-wave-like curves in the circumferential direction when the threaded pin is pressed against the adapter shaft, but rather that the adapter shaft would rest as evenly as possible against the solid shaft.

[0012] In an advantageous embodiment, the second recess overlaps with one of the axial slots,

[0013] In particular, the area axially covered by the second recess overlaps the area axially covered by the axial slot, and / or the area circumferentially covered by the second recess overlaps the area circumferentially covered by the axial slot. The advantage here is that the cylindrical bolt presses two areas of the adapter shaft against the solid shaft. This allows for slight displacement or expansion of the areas in the circumferential direction or counter to the circumferential direction, i.e., toward the slot area.

[0014] According to the invention, the cylinder bolt is designed as a disc, in particular as a fully cylindrical disc. This is advantageous because it allows for simple and cost-effective production.

[0015] In an advantageous embodiment, the shaft is inserted into a hollow shaft portion of the adapter shaft, in particular arranged coaxially with the adapter shaft. The advantage here is that the shaft can be accommodated in the adapter shaft and is centered relative to the adapter shaft's rotational axis.

[0016] In an advantageous embodiment, the axial slot(s) at the axial end of the adapter shaft open into the ambient air. This is advantageous because the adapter shaft exhibits high elasticity in the axial end region.

[0017] In an advantageous embodiment, the first recess and the second recess are arranged diametrically opposite one another, in particular, their centers of gravity or centers are 180° apart in the circumferential direction. It is advantageous that the arrangement is balanced. It is particularly important that the volume of material removed for the first recess during production is equal to the volume of material removed for the second recess.

[0018] In an advantageous embodiment, the adapter shaft, particularly between the second recess and the axial end of the adapter shaft, has a chamfer, in particular an insertion bevel, at its axial end region, which leads to the second recess when the clamping ring is placed on the cylinder bolt. This is advantageous in that when the clamping ring is placed on the adapter shaft, the cylinder bolt is guided into the second recess, and after the cylinder bolt is received in the second recess, the adapter shaft, particularly the axial end region, expands radially outward.

[0019] In an advantageous embodiment, the adapter shaft is radially less expanded in an axial region between the region axially covered by the second recess and the axial end of the adapter shaft in the region circumferentially covered by the second recess than in any other region, in particular any other region diametrically opposite, in particular in the circumferential direction. This is advantageous in that the cylinder bolt is inserted into the second recess with little force and is then held in place by the elastic expansion of the adapter shaft.

[0020] In an advantageous embodiment, the maximum radial distance of the adapter shaft in an axial region between the region axially covered by the second recess and the axial end of the adapter shaft increases from the region circumferentially covered by the second recess to the region circumferentially covered by the first recess. This is advantageous in that the cylinder bolt can be inserted into the second recess with little force, and the bead provides additional positive axial locking if the clamping ring has a corresponding recess on its outer edge.

[0021] In an advantageous embodiment, the first recess is rectangular and / or tangentially oriented. This is advantageous because it can be easily manufactured as a tangential, flat flattening.

[0022] In an advantageous embodiment, the second recess is rectangular and / or has a particularly circular blind hole that does not extend through the adapter shaft. This also allows for simple manufacturing.

[0023] In an advantageous embodiment, the maximum radial distance of the adapter shaft in the axial direction has a local minimum in the axial region covered by the second recess. This is advantageous because it allows for simple manufacturing of the adapter shaft by rotating the shaft.

[0024] In an advantageous embodiment, the area axially covered by the first recess overlaps the area axially covered by the second recess. Advantageously, the two devices are arranged so that they correspond to one another, allowing the cylinder bolt to be arranged so that it can project into both.

[0025] In an advantageous embodiment, the area covered by the first recess in the circumferential direction overlaps the area covered by the second recess in the circumferential direction. Advantageously, the two devices are arranged so that they correspond to one another, and thus the cylinder bolt can be arranged so that it can project into both.

[0026] In an advantageous embodiment, the adapter shaft has a chamfer, in particular an insertion chamfer, which covers a circumferential angle range in the circumferential direction, which contains the circumferential angle range covered by the second recess, wherein - spaced circumferentially from the chamfer - a bead is formed on the adapter shaft, which covers an axial region containing the axial region covered by the chamfer, in particular wherein the area covered by the bead in the circumferential direction contains the area covered by the flattening in the circumferential direction, In particular, the radial spacing area covered by the chamfer is arranged radially within the radial spacing area covered by the bead or adjoins it radially inward. The advantage here is that, in the same axial area, there is a positive locking of the screw part and also an insertion chamfer, i.e., a non-positive receptacle for the cylinder bolt. Thus, two completely different functions are achieved in the same axial area.

[0027] Further advantages emerge from the dependent claims. The invention is not limited to the combination of features in the claims. Further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to those skilled in the art, particularly from the problem and / or the problem posed by comparison with the prior art.

[0028] The invention will now be explained in more detail using schematic illustrations: In the Fig. 1 is a longitudinal section through a clamping unit having an adapter shaft 1 with a clamping ring 4 attached. In the Fig. 2 shows an oblique view from a first viewing direction of the adapter shaft 1. In the Fig. 3 shows an oblique view of the adapter shaft 1 from a different perspective. In the Fig. 4 shows the clamping unit exploded. In the Fig. 5 shows the clamping unit before inserting the adapter shaft 1 into the clamping ring. In the Fig. 6 the clamping unit is shown in a cut-away oblique view.

[0029] As shown in the figures, the adapter shaft 1 has a hollow shaft portion that has axially extending slots, i.e., axial slots. The axial slots are preferably regularly spaced from one another in the circumferential direction and extend from the axially outer first end portion of the adapter shaft 1 to an axial position located outside the axial portion covered by the clamping ring 4. The preferred number of slots is three.

[0030] A solid shaft (not shown in the figures) is inserted into the adapter shaft 1. Thus, this solid shaft is radially surrounded by the adapter shaft 1.

[0031] A threaded pin 2 is screwed into a threaded bore radially through the clamping ring 4 and presses against a flattened portion 20 arranged on the adapter shaft 1.

[0032] The flattening 20 is located on the outside of the adapter shaft 1 and is aligned tangentially to the central axis or axis of rotation of the adapter shaft.

[0033] In the axial area covered by the flattening 20, the adapter shaft 1 is cylindrical on its outer circumference with the exception of the axial slots and a further recess with a bottom surface 30.

[0034] The threaded pin 2 presses on the flat 20.

[0035] Thus, by screwing the threaded pin 2 into the threaded hole through the clamping ring, it is possible to press the adapter shaft 1 onto the solid shaft.

[0036] Preferably, the particularly radially directed recess with base surface 30 is arranged diametrically opposite the flattened portion 20 and serves as a pressing surface for a cylinder bolt 3, which is formed in a particularly radially directed recess on the inner circumference of the clamping ring 4. The cylinder bolt 3 engages in the recess and is held in the clamping ring by means of another recess.

[0037] This ensures that the bearing is not lost in the axial and circumferential directions.

[0038] As in Fig. As shown in Figure 5, the cylinder bolt 3 is first inserted into the particularly radially directed recess on the inner circumference of the clamping ring 4, and then the clamping ring 4 is pushed onto the adapter shaft 1. A chamfer 41, which acts as an insertion bevel, ensures that the adapter shaft 1 slides smoothly onto the cylinder bolt 3 accommodated in the clamping ring 4. During this sliding process, the adapter shaft 1 is elastically deformed, particularly radially pressed. Due to the axial slots, this elastic deformation can be achieved with little force.

[0039] As soon as the cylinder bolt 3 reaches the recess with the bottom surface 30, it is pressed into the recess against the bottom surface 30 by the counterforce generated by the elastic deflection. Thus, one area of ​​the cylinder bolt 3 then protrudes into the recess with the bottom surface 30 of the adapter shaft 1, and another area into the recess on the inner wall of the clamping ring 4.

[0040] The chamfer 41 is located in the axial end region of the adapter shaft 1, i.e., between the axial end and the recess with base surface 30. The chamfer 41 extends only partially in the circumferential direction, in particular, it covers less than 180° in the circumferential direction. In the remaining circumferential area, i.e., not covered by the chamfer 41, a radially projecting bead 40 is formed. However, this bead does not have to extend over the entire remaining circumferential angular range, but preferably only over the circumferential angular range covered by the flattened portion 20 in the circumferential direction.

[0041] Preferably, the bead 40 is formed by incorporating the flattening 20 into a cylindrical region and thus forming it at the edge of the bead 40.

[0042] The area axially covered by the bead 40 thus overlaps with or encompasses the area axially covered by the chamfer 41. Thus, the radial distance area covered by the chamfer 41 is smaller than the radial distance area covered by the bead 40 or radially adjoins it, in particular, it is arranged radially inward.

[0043] The respective recess thus surrounds the cylinder bolt 3 and thus acts as a loss protection.

[0044] The recess with bottom surface 30 is preferably designed as a countersink in the adapter shaft 1.

[0045] The adapter shaft 1, the threaded pin 2 and the cylinder bolt 3 as well as the clamping ring 4 thus form a system for a force-locking connection.

[0046] In the upper part of the Fig. 1 it is visible that the clamping ring 4 sits on the bead 40 and in the lower, i.e. diametrically opposite, part of the Fig.1, the chamfer 41, designed as an insertion bevel 40, is visible, which is spaced from the clamping ring 4. This is because the bead 40 is radially wider than the chamfer 41. The inner wall of the clamping ring 4, on the other hand, is designed like the area of ​​a rotating body, i.e., with a constant radial distance in every axial position, i.e., a radial distance independent of the circumferential position.

[0047] The invention thus enables a clamping connection, in particular a shrink disc connection, between an adapter shaft and a shaft, in particular a solid shaft.

[0048] The bead 40 also enables an additional form-fitting limitation of the threaded pin 2 in the axial direction. List of reference symbols 1 adapter shaft, especially hollow shaft area 2 threaded pins 3 cylinder bolts 4 clamping ring 20 Flattening 30 floor space 40 bead 41 chamfer

Claims

[1] Arrangement for the force-locking connection of an adapter shaft (1) to a shaft by means of a clamping ring (4), wherein the clamping ring (4) is placed on the adapter shaft (1), wherein the shaft is inserted into the adapter shaft (1), wherein the clamping ring (4) has a radially continuous threaded bore into which a screw part is screwed, which presses on the adapter shaft (1), wherein a cylinder bolt (3) is received in a first recess of the clamping ring (4), which projects radially inward into a second recess which is made in the adapter shaft (1), characterized by , that the cylinder bolt (3) is designed as a disc. [2] Arrangement according to claim 1, characterized by that the adapter shaft (1) has axial slots. [3] Arrangement according to at least one of the preceding claims, characterized bythat the second recess overlaps with one of the axial slots. [4] Arrangement according to at least one of the preceding claims, characterized by that the disc is a fully cylindrical disc. [5] Arrangement according to at least one of the preceding claims, characterized by that the shaft is inserted into a hollow shaft area of ​​the adapter shaft (1). [6] Arrangement according to at least one of the preceding claims, characterized by that the axial slots at the axial end of the adapter shaft (1) open into the ambient air. [7] Arrangement according to at least one of the preceding claims, characterized by that the adapter shaft (1) has a chamfer (41) at its axial end region, which leads to the second recess when the clamping ring (4) is placed on the cylinder bolt (3). [8] Arrangement according to at least one of the preceding claims, characterized bythat the adapter shaft (1) is radially less extended in an axial region between the region axially covered by the second recess and the axial end of the adapter shaft (1) in the region covered by the second recess in the circumferential direction than in another diametrically opposite region [9] Arrangement according to at least one of the preceding claims, characterized by that the maximum radial distance of the adapter shaft (1) in an axial region between the region axially covered by the second recess and the axial end of the adapter shaft (1) increases from the region covered by the second recess in the circumferential direction to the region covered by the first recess in the circumferential direction. [10] Arrangement according to at least one of the preceding claims, characterized by , that the first recess is rectangular and / or tangentially aligned, and / or that the second recess is rectangular and / or has a blind hole that does not pass through the adapter shaft (1). [11] Arrangement according to at least one of the preceding claims, characterized by , that the adapter shaft (1) has a chamfer (41) which covers a circumferential angular range in the circumferential direction which contains the circumferential angular range covered by the second recess, wherein - spaced from the chamfer in the circumferential direction - a bead (40) is formed on the adapter shaft (1), which bead covers an axial region containing the axial region covered by the chamfer. [12] Arrangement according to at least one of the preceding claims, characterized by that the course of the maximum radial distance of the adapter shaft (1) in the axial direction has a local minimum in the axial region covered by the second recess. [13] Arrangement according to at least one of the preceding claims, characterized by that the area axially covered by the first recess overlaps with the area axially covered by the second recess. [14] Arrangement according to at least one of the preceding claims, characterized by that the area covered by the first recess in the circumferential direction overlaps with the area covered by the second recess in the circumferential direction.

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