WO2022069365A1

WO2022069365A1 - Coupling having an improved shaft attachment and industrial application and use

Info

Publication number: WO2022069365A1
Application number: PCT/EP2021/076351
Authority: WO
Inventors: Michael Kropp; Niklas Sondermann
Original assignee: Flender Gmbh
Priority date: 2020-10-01
Filing date: 2021-09-24
Publication date: 2022-04-07
Also published as: DE102020212446A1

Abstract

The invention relates to a coupling (10) having a first hub part (20) which is designed to be separable for a torque-transmitting connection with a first shaft (12). The coupling (10) also comprises a spring groove (30) for receiving a spring (32). According to the invention, the spring groove (30) is designed to be separable. The invention also relates to an industrial application (50) and to a use, which is equipped with such a coupling (10).

Description

description

Coupling with improved shaft connection and industrial application and use

The invention relates to a clutch that has an improved shaft connection. The invention also relates to an industrial application and a use that has such a clutch.

From publication CN 104100649 A a clutch is known which has a hub part which is divisible and in which spring grooves are formed. The hub part is designed to be divisible along a parting plane. The spring grooves each lie completely in one half of the hub of the hub part.

Document US 2004/0091310 A1 discloses a clutch that has a divisible hub part that includes two hub halves that are detachably connected to one another via screws.

DE 69 34 998 U discloses an articulated cardan jaw with an indivisible hub that can be bent open on one side due to a longitudinal slot for attachment to a shaft, with a key of the shaft between two projecting tabs that can be screwed together and separated from one another by the longitudinal slot are, can be wedged.

Couplings are used in different areas of application that are subject to increasing demands in terms of performance, service life and ease of maintenance. The object of the invention is to provide a clutch that offers an improvement in at least one of the aspects outlined.

The object is solved by a clutch with the features of claim 1 . Preferred configurations are in specified the subclaims and the following description, each individually or in combination may represent an aspect of the invention. If a feature is shown in combination with another feature, this only serves to simplify the presentation of the invention and should in no way mean that this feature cannot be a development of the invention without the other feature.

The coupling has a first hub part that can be connected to a first shaft. The first hub part is designed to transmit a torque transported via the shaft to other components of the clutch or from these to the first shaft. The first hub part is divisible and accordingly comprises a first and a second hub half. The hub halves can be releasably joined together during assembly, so that a torque-transmitting connection to the first shaft is ensured. In particular, the first hub half and the second hub half are designed as separate parts that can be separated from one another. The first hub halves and the second hub halves can preferably be connected to one another and/or detached from one another via an, in particular exclusive, translatory relative movement, in particular in the radial direction of the shaft. In particular, the first hub half and the second hub half are designed to encompass essentially half the circumference of the shaft, preferably 175° to 180° of the shaft in the circumferential direction. The first hub half and the second hub half can be identical, mirror images of one another or just complementary to one another. A keyway is formed in the first hub portion and is adapted to releasably receive a key. In an intended operating state, the torque-transmitting connection between the first shaft and the first hub part takes place by means of the spring. The keyway is divisible. Accordingly, the keyway is only partially formed in the first and second halves of the hub. The first and second halves of the hub can be easily aligned with one another when the coupling is installed thanks to the divisible keyway. The first hub part is consequently can be mounted precisely in a simple manner. Precise assembly of the first hub part on the first shaft in turn ensures minimized imbalances during operation of the clutch, which in turn leads to an increased service life of the clutch. In addition, the first hub part is maintenance-friendly.

The spring groove formed in the first hub part and a wave spring groove provided in the shaft can together accommodate a spring, in particular a feather key, and thereby form a form-fitting shaft-hub connection. The spring groove formed in the first hub part has a substantially rectangular cross section in the axial direction of the shaft in the assembled state, particularly when the first hub half and the second hub half are in contact with one another or are at their minimum possible distance from one another. Side surfaces of the keyway that point in the tangential direction, which are formed by the first hub part, can thereby essentially lie flat against a key, in particular a feather key, inserted in the keyway and the shaft keyway of the shaft in the assembled state. The tongue is preferably pressed in the tangential direction in the tongue groove of the first hub part. If the first hub half is connected to the second hub half, in particular screwed, and an at least minimal gap remains between the first hub half and the second hub half, at least in the area of the spring groove, the spring can easily slide between the first hub half and the second The hub half must be clamped in the tangential direction and thus pressed in the keyway of the first hub part. Additionally or alternatively, it is possible to press the shaft in the first hub part, in particular to clamp it between the first hub half and the second hub half. The non-rotatable connection of the shaft with the first hub part can thus be effected both positively and non-positively. This enables a particularly strong non-rotatable connection of the shaft to the first hub part, which can transmit a particularly high torque. Due to the forceful jamming of the shaft in the In the first hub part, it is even possible to transmit a maximum torque that is above a maximum torque provided for the key and the keyway provided for the shaft-hub connection, without fear of plastic deformation of the key, the keyway and/or the wave keyway .

In one embodiment of the claimed clutch, the spring groove can be divided when the clutch is dismantled. Mutual loosening of the first and second hub halves enables the spring to be easily released from the spring groove. In particular, the spring can be removed without additional aids when dismantling. As a result, the first hub part can be dismantled quickly and easily from the first shaft, which speeds up the maintenance process.

In addition, in the claimed clutch, the tongue and/or the tongue groove can have a fit along a circumferential direction. The fit is configured to adjust a relative position between the first and second hub halves of the first hub part. The fit can be designed as a clearance fit, transition fit or press fit. The relative position between the first and second halves of the hub can be adjusted in particular by appropriate selection of a keyway width and/or a keyway width. When manufacturing the coupling, these dimensions can be maintained in a simple manner with relatively narrow tolerances. The increased precision during assembly is therefore achieved in a cost-effective manner. Furthermore, the tongue groove and/or the tongue can be adjusted on their side surfaces by their angular accuracy relative to one another. Tongue grooves and tongues with correspondingly straight side surfaces can also be produced cost-effectively.

Furthermore, the spring groove can be designed so that it can be divided symmetrically or asymmetrically. A symmetrically designed spring groove is symmetrically divided by a dividing plane between the first and second hub halves and is thus simple in Construction . With an asymmetrically divided keyway, it can be ensured that the key typically remains in the same hub half when it is removed. This prevents the spring from accidentally falling down. In addition, the spring groove can have a rectangular, trapezoidal, trapezoidal, polygonal, diamond-shaped or dovetail-shaped cross section.

The spring can have a corresponding cross section. In terms of mechanical strength, the tongue and groove can be adapted to a wide range of applications. In particular, spring grooves or Springs can be used in forms that are technically impossible or impractical in undivided spring grooves. Design freedom is therefore gained by the claimed clutch, and thus an enlarged conceivable range of applications is opened up.

In a further embodiment of the claimed clutch, the spring groove is arranged radially inside a screw connection of the first hub part. This means that the tongue and groove are positioned in the area of the screw connection. The screw connection of the first hub part allows the first and second hub halves to be detachably connected to one another, so that they form the first hub part. As a result, the first and second halves of the hub can be aligned with one another simply by tightening the screw connection in the vicinity of which the divisible spring groove is formed. Compared to the prior art, a successive tightening of opposing screw connections on a hub part is no longer necessary. The claimed coupling makes it possible to speed up assembly of the latter.

Furthermore, the first hub part can be designed as a claw part. A precise alignment of the claws is also possible due to the precise alignment of the first and second hub halves of the first hub part. This prevents a claw from bearing against a damping body in a manner that is not suitable for the load. Carry claws that do not fit properly to the load in turn to increased wear of the corresponding damping body. The stressed clutch thus makes it possible to more reliably exploit the potential in service life for a damping body, and thus for the clutch as a whole. The efficiency of the coupling and the application associated with it is thus further increased.

In addition, a cutting gap can be formed in the first hub part, which extends through the spring groove. The dividing plane along which the tongue groove is divided is also defined by the kerf. The first hub part can consequently be produced cost-effectively in a simple manner by sawing it open into a first and a second hub half. When mounted, the cutting gap is bridged by the spring. In particular, the cutting gap is also present in the assembled state of the first hub part. Advantageously, surfaces of the first hub half and the second hub half that face each other in the tangential direction are at least slightly spaced apart from one another via the cutting gap. This makes it possible to clamp the shaft and/or the spring in the first hub part.

In a further embodiment of the claimed clutch, a plurality of spring grooves can be formed in the first hub part, which are designed to be divisible. The hub halves are, for example, at three or four, and so on. divisible spring grooves as hub thirds or hub quarters , etc . to grasp . The claimed clutch thus makes it possible to use a plurality of springs in a simple manner in order to produce the torque-transmitting connection between the first shaft and the first hub part. As a result, redundancy can be maintained, or by reducing the mechanical stresses on the springs and/or spring grooves, their wear can be minimized. As a result, such a precise alignment of the first hub part on the first shaft can be maintained for a long time. The stressed coupling is therefore suitable for mechanically highly stressed applications as well as for applications requiring precision. settable . The claimed clutch consequently has an enlarged possible range of uses.

Likewise, the claimed clutch can have a second hub part, which interacts with the first hub part in a torque-transmitting manner. This can be done directly or indirectly, for example with the interposition of at least one damping body. Like the first hub part, the second hub part has a divisible keyway, through which a torque-transmitting connection to a second shaft is produced in the assembled state. Furthermore, the second hub part can be designed according to at least one of the embodiments of the first hub part outlined above.

In another embodiment of the claimed coupling, it has an intermediate piece that is essentially tubular. The intermediate piece is connected to at least the first hub part in a torque-transmitting manner. Such intermediate pieces and correspondingly constructed couplings are known, for example, from the previously unpublished European patent application EP 20 198 260. 0 known . The disclosure of EP 20 198 260 . 0 is incorporated by reference into the present application.

The task is also solved by an industrial application according to the invention. The industrial application includes a drive unit through which a drive power is provided and which has an output shaft. The drive unit can be designed as an electric motor, internal combustion engine, hydraulic motor, turbine wheel or flywheel. The drive power is connected via a clutch to a driven unit that has an input shaft and is a mechanical application that determines the function of the industrial application. The industrial application can be used as a whole as a mill, roller mill, cement mill, sugar mill, extruder, conveyor system, rock crusher, roller crusher, agitator, agitated crusher, rotary kiln, roller press, roller press, pump, fan, lifting device, scrap press or garbage compactor be trained. According to the invention, the clutch is designed according to one of the embodiments outlined above.

The task is also solved by using the coupling, which can be designed and developed as described above, for both a positive and non-positive shaft-hub connection. The shaft of the shaft-hub connection can enter into a form fit with the clutch via a spring used in the keyway of the coupling and a shaft keyway of the shaft, in particular a feather key. Due to the divisible first hub part, the shaft can also be clamped in the first hub part and/or the spring in the first hub part, so that a frictional connection can also be provided for the shaft-hub connection. Due to the fact that the first hub part can be divided, in particular into a first hub half and a second hub half that is separate from the first hub half, it is easy to assemble despite the simultaneous form fit and friction fit, so that the shaft-hub connection can be made quickly and easily .

The invention is explained in more detail below with reference to individual embodiments in figures. The figures are to be read as complementing one another to the extent that the same reference symbols have the same technical meaning in different figures. The features of the individual designs can also be combined with one another. Furthermore, the embodiments shown in the figures can be combined with the features outlined above. They show in detail:

1 schematically shows a first embodiment of the claimed clutch in a sectional view;

2 shows a detailed view of the first embodiment of the claimed clutch;

3 shows a schematic structure of an embodiment of the claimed industrial application. A first embodiment of the claimed clutch 10 is shown schematically in FIG. 1 in a sectional view. The clutch 10 is designed to transmit torque 25 from a first shaft 12 (not shown in detail) to a second shaft 14 (not shown in detail) by rotation about a main axis of rotation 15 . The clutch 10 comprises a first hub part 20 which, in the assembled state, produces a torque-transmitting connection of the clutch 10 to the first shaft 12 . The first hub portion 20 includes first and second hub halves 24 , 26 releasably connected together. The first and second halves of the hub are each provided with at least one claw 21, so that the first hub part 20 is designed as a claw part. The first and second hub halves 24 , 26 are detachably connected to one another via screws 34 which belong to a screw connection 35 . The first and second hub halves 24 , 26 are separated from one another along a parting plane 27 . Furthermore, a cutting gap 36 is formed between the first and second hub halves 24 , 26 . The first and second hub halves 24 , 26 each have adjacent indentations 42 which extend essentially in the radial direction 45 . This forms a divisible spring gap 30 in which a spring 32 (not shown in detail) can be releasably accommodated. The torque 25 is transmitted from the first shaft 12 to the clutch 10 , in particular to the first hub part 20 , by the spring 32 , which is accommodated in the divisible spring groove 30 in the assembled state. The torque 25 is further transmitted via the claws 21 to an essentially tubular adapter 40 with damping bodies 43 on the second hub part 22 . The second hub part 22 is designed to correspond to the first hub part 20 . Due to the fact that the second hub part 22 is designed to correspond to the first hub part 20, the coupling 10 according to FIG. 1 is a double-jointed coupling.

The embodiment according to FIG. 1 is shown in FIG. 2 in a detailed view. The first shaft 12 has a wave keyway 13 in which the key 32 is partially received. The spring 32 is also in the divisible spring groove 30 on first hub part 20 was added. This implements the principle of a feather key. The spring 32 is precisely aligned by the divisible spring groove 30, so that the first hub part 20 can be aligned and mounted on the first shaft 12 in a simple manner with increased accuracy. In the assembled state, which is shown in FIG. 2, a cutting gap 36 remains between the first hub half 24 and the second hub half 26. The cutting gap 36 is bridged by the spring 32.

A structure of an embodiment of a claimed industrial application 50 is shown schematically in FIG. The industrial application 50 includes a drive unit 52, which can be designed as an electric motor, internal combustion engine, hydraulic motor, turbine wheel or flywheel. Torque 25 is made available by drive unit 52 and is supplied to a clutch 10 via an output shaft 51 . The torque 25 is transmitted from the clutch 10 to an output unit 54 via an input shaft 53 . The output unit 54 is a mechanical application that determines the function of the industrial application 50 . The industrial application 50 can be designed as a whole as a mill, roller mill, cement mill, sugar mill, extruder, conveyor system, rock crusher, roller crusher, agitator, agitated comminutor, rotary kiln, roller press, roller press, pump, fan, lifting device, scrap press or garbage compactor. The coupling 10 is designed according to one of the embodiments outlined above, for example as a coupling 10 or double-jointed coupling according to FIG.

Claims

patent claims

1. Coupling (10), comprising a first hub part (20), which is designed to be divisible for a torque-transmitting connection with a first shaft (12), and has a keyway (30) for receiving a key (32), d a through c h g e n n ze i c h n e t that the Spring groove (30) is designed to be divisible.

2. Coupling (10) according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the spring groove (30) can be divided when the first hub part (20) is dismantled.

3. Coupling (10) according to claim 1 or 2, d a d u r c h g e k e n n z e i c h n e t that the spring (32) and/or the spring groove (30) along a circumferential direction is a fit for setting a relative position between a first and second hub half (24, 26) of the have the first hub part (20).

4. Coupling (10) according to one of claims 1 to 3, d a d u r c h g e k e n n z e i c h n e t that the spring groove (30) is formed symmetrically or asymmetrically divisible.

5. Coupling (10) according to one of claims 1 to 4, d a d u r c h g e k e n n z e i c h n e t that the spring groove (30) radially inside a screw connection (35) of the first

Hub part (20) is arranged.

6. Coupling (10) according to one of claims 1 to 5, d a d u r c h g e k e n n z e i c h n e t that the first hub part (20) is designed as a claw part.

7. Coupling (10) according to any one of claims 1 to 6, characterized in that in the first hub part (20) a cutting gap (36) is formed which extends through the spring groove (30).

8. Coupling (10) according to one of claims 1 to 7, d a d u r c h g e k e n n z e i c h n e t that in the first hub part (20) several spring grooves (30) are formed, which are formed divisible.

9. Coupling (10) according to one of Claims 1 to 8, d a d u r c h g e k e n n z e i c h n e t that the coupling (10) has a second hub part (22) which is connected to the first hub part (20) in a torque-transmitting manner and has at least one divisible spring groove (30 ) has.

10. Coupling (10) according to one of claims 1 to 9, d a d u r c h g e k e n n z e i c h n e t that the coupling (10) has an intermediate piece (40) which is connected in a torque-transmitting manner at least to the first hub part (20).

11. Industrial application (50), comprising a drive unit (52) with an output shaft (51) and an output unit (54) with an input shaft (53), which are connected to one another in a torque-transmitting manner via a clutch (10), d a d a r c h g e n n n s e i c h n e t that the Coupling (10) according to any one of claims 1 to 10 is formed.

12. Use of a coupling (10) according to any one of claims 1 to 10 for both a positive and a non-positive shaft-hub connection.