Arrangement for the force-fit connection of an adapter shaft to a shaft by means of a clamping ring

Abstract

Arrangement for the force-fit 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 through threaded bore into which a screw part is screwed which presses on the adapter shaft (1), wherein at least one insert ring (3) is inserted into an annular groove provided in the clamping ring (4) and / or is at least partially received, wherein each insert ring (3) has a radially inward projecting nose area (51) which at least partially extends into a slot of the adapter shaft (1), characterized by the fact that the slot is radially continuous, in particular through the wall of the hollow adapter shaft (1), - wherein the slot is an axial slot, i.e. extending in an axial direction with respect to the shaft axis of the adapter shaft (1), - or wherein the slot is a transverse slot (20), i.e. extending transversely to the axial direction with respect to the shaft axis of the adapter shaft (1), wherein the transverse slot (20) passes through an axial slot.

Description

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

[0002] A shaft-hub connection is known from DE 10 2014 007 063 A1. In this connection, an adapter shaft is connected to a shaft by means of a clamping ring mounted on the adapter shaft.

[0003] US Patent 4,603,998 A describes a shaft-hub connection as the closest state of the art.

[0004] A clamping coupling is known from DE 10 2011 013 887 A1.

[0005] An adapter is known from DE 10 2012 000 537 A1.

[0006] The invention is therefore based on the objective of further developing a force-fit connection between the shaft and the adapter shaft.

[0007] According to the invention, the problem is solved by the arrangement according to the features specified in claim 1.

[0008] Important features of the invention for the arrangement for the force-fit 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 through threaded bore into which a screw part, in particular a threaded pin, is screwed, which presses on the adapter shaft, wherein at least one insert ring is inserted and / or at least partially received in an annular groove provided in the clamping ring, in particular in an annular groove provided in the inner wall, in particular in the hollow side, of the clamping ring, wherein each insert ring has a radially inward projecting nose area which at least partially extends into a slot of the adapter shaft.

[0009] An advantage of this design is the creation of a locking mechanism, particularly in both the axial and circumferential directions. Furthermore, the invention is easy to implement and requires no additional special features apart from the insert.

[0010] Due to the axial slots, the adapter shaft can deflect elastically and thus be pressed against the hollow shaft as soon as the setscrew presses against it. This causes the shrink-fit to occur. A threaded bore extending through the clamping ring is provided for the setscrew. The recesses, however, are not continuous, particularly not on the adapter shaft or the clamping ring.

[0011] Shrinkage here does not refer to a thermally induced contraction, but rather a mechanically induced contraction.

[0012] Thus, the invention improves the safety of a force-fit connection between shaft and adapter shaft by using a clamping ring for shrinking the adapter shaft, which has a hollow shaft area, and which is arranged on the adapter shaft in a way that prevents loss, in particular in the axial direction and in the circumferential direction.

[0013] According to the invention, the slot is radially continuous, in particular through the wall of the hollow adapter shaft, - where the slot is an axial slot, i.e., it extends in an axial direction with respect to the shaft axis of the adapter shaft, - or where the slot is a transverse slot, i.e., extending transversely to the axial direction with respect to the shaft axis of the adapter shaft, in particular in the circumferential direction with respect to the shaft axis of the adapter shaft. An advantage of this is that a simple manufacturing of the locking mechanism is possible.

[0014] In a preferred design, each insert ring is manufactured as an injection-molded plastic part. The advantage here is that simple manufacturing is cost-effective.

[0015] According to the invention, the transverse slot passes through an axial slot. An advantage of this is that the nose sections can first be inserted into the axial slot and then into the transverse slots. In this way, a simple and quick connection can be achieved.

[0016] In an advantageous embodiment, the adapter shaft has additional axial slots, wherein the axial slots are regularly spaced apart from one another in the circumferential direction. The advantage here is that high elasticity can be achieved easily and that a radially oriented, non-uniform curvature of the adapter shaft in the circumferential direction is possible.

[0017] In an advantageous embodiment, the shaft is inserted into a hollow section of the adapter shaft, and in particular is arranged coaxially with the adapter shaft. An advantage of this is that a shrink connection can be easily achieved by means of the clamping ring placed on the adapter shaft.

[0018] In an advantageous embodiment, the axial slots are open towards the axial end of the adapter shaft, specifically opening into the surrounding environment, particularly the ambient air. This design offers the advantage of easily achieving high elasticity in the adapter shaft.

[0019] In an advantageous embodiment, the insert ring has a radially inward-projecting rib section spaced circumferentially from its nose area, which at least partially extends into the transverse slot. An advantage of this design is that axial securing is easily implemented.

[0020] In an advantageous embodiment, the adapter shaft has a chamfer, in particular an insertion chamfer, at its axial end region. The advantage here is that the clamping ring can be easily attached.

[0021] In an advantageous embodiment, the web area projects radially inwards and the radially inner edge is oriented tangentially. An advantage of this is that axial securing can be achieved by projecting into the transverse slot.

[0022] In an advantageous embodiment, the clamping ring has an insertion chamfer at its axial end region. The advantage here is that it can be manufactured simply and without requiring any special force.

[0023] In an advantageous embodiment, the adapter shaft has axial slots, in particular axial slots spaced apart from one another in the circumferential direction, and especially axial slots spaced at regular intervals in the circumferential direction. The advantage here is that the adapter shaft can be deformed without significant force and that the deformation does not allow for the formation of waves in the circumferential direction. Without axial slots, there would be a risk that when the threaded pin is pressed against the adapter shaft, it would not develop radially oriented sinusoidal wave-like patterns in the circumferential direction, but rather that the adapter shaft would bear against the solid shaft as evenly as possible.

[0024] In an advantageous embodiment, the shaft is inserted into a hollow section of the adapter shaft, and in particular is arranged coaxially with the adapter shaft. It is advantageous that the shaft can be received within the adapter shaft and is centered on the axis of rotation of the adapter shaft.

[0025] In a preferred embodiment, the axial slot(s) at the axial end of the adapter shaft open into the ambient air. An advantage of this design is that the adapter shaft exhibits high elasticity in its axial end region.

[0026] In an advantageous embodiment, the adapter shaft has an increasing radial distance towards its axial end, in particular a circumferentially extending, radially projecting ridge, so that the clamping ring engages behind it, i.e., the adapter shaft engages behind the clamping ring. It is advantageous that the clamping ring can be clipped onto the adapter shaft. This is because the ridge, which deflects elastically radially inwards, snaps into place behind the clamping ring and thus secures the clamping ring to the adapter shaft.

[0027] In particular, a wave-like collar is formed on the side of the adapter shaft facing away from the bead, which axially limits the clamping ring, especially in the insertion direction. This allows for simple axial limitation, which is advantageous.

[0028] Further advantages arise from the dependent claims. The invention is not limited to the combination of features of the claims. For those skilled in the art, further meaningful combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent, in particular from the problem statement and / or the problem arising from a comparison with the prior art.

[0029] The invention will now be explained in more detail with reference to schematic illustrations: The Fig. Figures 1 to 6 show a first embodiment. The Fig. Figures 7 to 12 show a second embodiment.

[0030] In the Fig. Figure 1 shows a longitudinal section through a clamping unit, i.e., a clamping arrangement, comprising an adapter shaft 1 with a clamping ring 4 attached and an insert ring 3 to prevent the clamping ring 4 from being lost.

[0031] In the Fig. Figure 2 shows an oblique view from a first viewing direction of the adapter shaft 1.

[0032] In the Fig. Figure 3 shows an oblique view of the adapter shaft 1 from a different perspective.

[0033] In the Fig. Figure 4 shows an oblique view of the adapter shaft 1 from yet another viewing direction.

[0034] In the Fig. Figure 5 shows the clamping unit in exploded view in oblique view, with adapter shaft 1 and clamping ring 4 shown partially cut off and insert ring 3 not shown partially cut off.

[0035] In the Fig. Figure 6 shows the clamping unit in a sectional, oblique view.

[0036] In the Fig. Figure 7 shows a longitudinal section through another clamping arrangement, in particular a clamping unit, wherein two insert rings 70 are used instead of the insert ring 3. Fig. 1 to 6 are used for loss prevention.

[0037] In the Fig. Figure 8 shows an oblique view of the adapter shaft 1.

[0038] In the Fig. Figure 9 shows the clamping arrangement in exploded view.

[0039] In the Fig. Figure 10 shows the clamping arrangement in oblique view before screwing in the threaded pin 2, with adapter shaft 1 and clamping ring 4 shown partially cut off and insert ring 3 not shown partially cut off.

[0040] In the Fig. Figure 11 shows the clamping arrangement with the screwed-in threaded pin 2 in an oblique view.

[0041] In the Fig. Figure 12 shows the insert ring 70 in top view.

[0042] As in the Fig. As shown in Figures 1 to 6, the adapter shaft 1 has a hollow shaft section with axially extending slots, i.e., axial slots. Preferably, the axial slots are regularly spaced apart from one another in the circumferential direction and extend from the axially outer first end section of the adapter shaft 1 to an axial position located outside the axial area covered by the clamping ring 4. The preferred number of slots is three.

[0043] A solid shaft, not shown in the figures, is inserted into the adapter shaft 1. This solid shaft is thus radially surrounded by the adapter shaft 1.

[0044] A threaded pin 2 is screwed into a threaded bore radially through the clamping ring 4 and presses against a flat surface arranged on the adapter shaft 1.

[0045] A flattening is provided on the outside of the adapter shaft 1 and is oriented tangentially to the central axis or axis of rotation of the adapter shaft.

[0046] The threaded pin 2 presses against the flat surface.

[0047] In the axial area covered by the flattening, the adapter shaft 1 is cylindrical on its outer circumference with the exception of the axial slots and a transverse slot 20.

[0048] Thus, by screwing the threaded pin 2 into the threaded bore through the clamping ring, it is possible to press the adapter shaft 1 against the solid shaft, in particular to achieve a shrink connection.

[0049] Preferably, the transverse slot 20 is arranged diametrically opposite the flattened section and serves to engage the insert ring 3, which snaps into a circumferentially formed annular groove on the inner circumference of the clamping ring 4. A radially inwardly projecting web area 51 formed on the insert ring 3 engages in the transverse slot 20.

[0050] This creates a loss-proof seal in the axial direction.

[0051] In order to obtain a circumferentially acting loss protection, nose areas 51 are formed on the insert ring 3, which project radially inwards on the insert ring 3.

[0052] In the manufacture of the clamping arrangement, the insert ring 3 is first inserted into the ring groove formed on the inner wall of the clamping ring 4.

[0053] The insert ring 3 is made of an elastic material, such as plastic or aluminum. The insert ring 3 has a continuous cutout at one circumferential position, meaning it is open. This open design of the insert ring 3 results in high elasticity and thus easy installation, particularly easy insertion into the ring groove.

[0054] When the insert ring 3 is placed in the ring groove, the opening of the insert ring 3 is brought into the area of ​​the threaded bore. This allows the threaded pin 2, after the clamping ring 4 has been placed on the adapter shaft 1, to press unimpeded through the opening of the insert ring onto the flat surface of the adapter shaft 1.

[0055] When the clamping ring 4 is placed on the adapter shaft 1, the nose areas 51 of the insert ring 3 also serve for alignment, as these nose areas 51 engage in the axial slots.

[0056] In this way, the adapter shaft 1 is secured in the circumferential direction. The insert ring 3 is positively connected to the adapter shaft 1 in the circumferential direction by means of the lugs 51, in particular by the engagement of the lugs 51 in the axial slots, and the insert ring 3 is positively connected to the clamping ring 4 in the circumferential direction by means of the threaded pin 2 pressing against the flattened surface of the adapter shaft 1.

[0057] The threaded pin 2 therefore not only has the function of pressing on the clamping ring 4 and thus clamping the shaft, in particular by means of shrinking, but also the function of positively securing the insert ring in the circumferential direction.

[0058] As mentioned above, the insert ring 3 for axial securing has a web area 52 which engages in the transverse slot 20. The transverse slot 20 is arranged perpendicular to one of the axial slots of the adapter shaft 1 and extends only over an angular range smaller than the angular distance to the next axial slot. The transverse slot 20, like each of the axial slots, extends radially through the adapter shaft 1. The transverse slot 20 extends further in the circumferential direction than in the axial direction. Each axial slot, however, extends further in the axial direction than in the circumferential direction.

[0059] The transverse slot 20 passes through the axial slot and is arranged diametrically to the flattening on the circumference of the adapter shaft, in particular just like this axial slot.

[0060] Likewise, the bridge area 52 is arranged diametrically opposite to the opening of the insert ring 3.

[0061] The insert ring 3, together with the threaded pin 2, secures the clamping ring 4 in the circumferential direction, and by means of its web area 52 projecting into the transverse slot 20, the insert ring 3 secures it in the axial direction.

[0062] Preferably, the adapter shaft 1 has a chamfer that allows the adapter shaft 1 to be easily inserted onto the insert ring 3 held in the clamping ring 4. When the clamping ring 4 is placed onto the adapter shaft 1, the adapter shaft 1 is elastically deformed, in particular radially compressed, and shrunk radially onto the shaft held in the adapter shaft 1. Due to the axial slots, this elastic deformation can be achieved with minimal force.

[0063] Once the clamping ring 4 reaches its intended position, the adapter shaft 1 relaxes, and the shaft can be inserted into the adapter shaft 1 without requiring any special force. The threaded pin 2 is then screwed in further, i.e., tightened, and thus presses radially inwards, causing the adapter shaft 1 to shrink onto the shaft.

[0064] The adapter shaft 1, the threaded pin 2 and the insert ring 3 as well as the clamping ring 4 thus form a system for force-fit connection.

[0065] The inner wall of the clamping ring 4 is designed like a region of a body of revolution, i.e. with a constant radial distance in every axial position, i.e., a radial distance independent of the circumferential position.

[0066] As in the Fig. As shown, 7 to 12, but a pair of insert rings 70 can also be used instead of insert ring 3.

[0067] These insert rings 70, unlike the insert ring 3, do not have a bridge area 52 but only nose areas 51.

[0068] As in Fig. As shown in Figure 12, the respective insert ring 70 is open, with the opening not being diametrically opposed to the radially inwardly directed nose area 51. As in Fig. 9, Fig. 10 and Fig. As shown in Figure 11, the two insert rings 70 are received in the annular groove of the clamping ring 4, the openings being aligned such that the threaded pin 2 presses directly through the openings onto the flattening of the adapter shaft 1.

[0069] The two insert rings 70 are identical in design, but arranged rotated 180° relative to each other. Thus, although the insert rings 70 are in contact with each other, the nose areas 51 are at different circumferential positions.

[0070] The pair of insert rings 70 is inserted into the annular groove machined into the clamping ring 4. Thus, the lugs 51 protrude radially inwards. When the clamping ring 4 is placed onto the adapter shaft 1, the insert rings 70 are oriented in the annular groove, i.e., positioned in a circumferential rotational position, such that the lugs 51 can be inserted into one of the axial slots of the adapter shaft 1. After the mounting process is complete, the insert rings 70 are rotated relative to each other so that the lugs 51 are displaced in the transverse slot 20 and are thus arranged on two different sides with respect to the axial slot. In this way, axial locking is achieved by means of the lugs 51 located in the transverse slot.Furthermore, the rotational position of the insert rings 70 is such that the openings have the same area in the circumferential direction or at least overlap, so that the threaded pin 2 can press directly onto the flattening of the adapter shaft 1.

[0071] In this way, protection is also achieved in the circumferential direction.

[0072] On the adapter shaft 1, a radially outwardly projecting bead 50 is formed at the axial end region. The threaded pin 2 presses against a flat surface formed on the adapter shaft, which covers a circumferential angle range equal to that covered by the bead 50 in the circumferential direction. The radial protrusion is relative to the flat surface.

[0073] In another embodiment according to the invention, the clamping ring 4 has a chamfer at its end region facing the beginning of the insertion of the adapter shaft 1, in order to easily effect elastic shrinkage, i.e. elastic deflection of the slotted axial region of the adapter shaft 1, which acts as an insertion ramp and thus causes an increasing elastic deflection of the slotted region when the clamping ring 4 is inserted, i.e. when it is inserted onto the adapter shaft 1.

[0074] 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, with integrated loss protection.

[0075] In another embodiment according to the invention, the insert ring 3 can also be made of steel. Reference symbol list 1 Adapter shaft, especially hollow shaft area 2 threaded pins 3 insert rings 4 clamping rings 20 cross slots 50 bulge 51 Nose area 52 footbridge area 70 insert rings

Claims

[1] Arrangement for force-fit 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 through threaded bore into which a screw part is screwed which presses on the adapter shaft (1), wherein at least one insert ring (3) is inserted into an annular groove provided in the clamping ring (4) and / or is at least partially received, wherein each insert ring (3) has a radially inward projecting nose area (51) which at least partially extends into a slot of the adapter shaft (1), characterized by , that the slot is radially continuous, in particular through the wall of the hollow adapter shaft (1), - wherein the slot is an axial slot, i.e. extending in an axial direction with respect to the shaft axis of the adapter shaft (1), - or wherein the slot is a transverse slot (20), i.e. extending transversely to the axial direction with respect to the shaft axis of the adapter shaft (1), wherein the transverse slot (20) passes through an axial slot. [2] Arrangement according to claim 1, characterized by that each insert area is manufactured as a plastic injection molded part. [3] Arrangement according to at least one of the preceding claims, characterized by , that the adapter shaft (1) has further axial slots, wherein the axial slots are regularly spaced apart from each other in the circumferential direction. [4] Arrangement according to at least one of the preceding claims, characterized by , that the shaft is inserted into a section of the adapter shaft (1) designed as a hollow shaft section. [5] Arrangement according to at least one of the preceding claims, characterized by that the axial slots are open towards the axial end of the adapter shaft (1). [6] Arrangement according to at least one of the preceding claims, characterized by , that the insert ring (3) has a radially inward projecting bridge area (52) spaced from its nose area (51) in the circumferential direction, which projects at least partially into the transverse slot (20). [7] Arrangement according to at least one of the preceding claims, characterized by , that the adapter shaft (1) has a chamfer at its axial end region [8] Arrangement according to at least one of the preceding claims, characterized by , that the web area (52) projects radially inwards and the radially inner edge is tangentially directed. [9] Arrangement according to at least one of the preceding claims, characterized by, that the clamping ring (4) has an insertion chamfer at its axial end region. [10] Arrangement according to at least one of the preceding claims, characterized by , that the screw part presses on a flattened area formed on the outer circumference of the adapter shaft (1), wherein the adapter shaft (1) has a radially outwardly rising bead at its axial end region, which covers a circumferential angle range in the circumferential direction, - which includes the circumferential angle area covered by the screw part in the circumferential direction - and / or which corresponds to the circumferential angle area covered by the flattening in the circumferential direction.

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