DE102017113075B4 - Compensating coupling, method of making a compensating coupling and core slide - Google Patents

Abstract

Compensating coupling (1) for coupling two rotating machine parts, the compensating coupling (1) enabling a transmission of a torsional moment and a compensation of an axial offset, a radial offset and / or an angular offset between the machine parts, with two disk-shaped support bodies (2, 3; 16, 17, 18), which are connected to one another via a helical elastic coupling element (4), characterized in that the helical elastic coupling element (4) has partial areas which are curved or angled in different directions in one development, so that the partial areas of the elastic coupling element (4) can be acted upon differently, with the result that the different partial areas can be deformed differently as a result of the forces introduced into the coupling elements in the end areas.

Description

TECHNICAL FIELD OF THE INVENTION

The invention relates to a compensating coupling which is used to couple two rotating machine parts. By means of the compensating coupling, a torsional moment is to be transmitted between the two machine parts while at the same time making it possible to compensate for an axial offset, a radial offset and / or an angular offset between the machine parts. The invention also relates to a method for producing such a compensating coupling and to a core slide that can be used to produce a compensating coupling.

STATE OF THE ART

DE 42 15 725 A1 discloses a coupling for the torsionally rigid connection of two shafts, which is produced in one piece as an injection-molded part from plastic. Disc-shaped support bodies carried by the two hubs of the clutch are connected to one another via lamellae arranged in a transverse plane and elastic axial webs connecting the lamellae. Here, two axial webs opposite one another in the circumferential direction are used between adjacent lamellae, with axial webs between adjacent pairs of lamellae being arranged offset from one another by 90 ° in the circumferential direction. Axially external lamellae can be connected to the hubs via radial webs and have arcuate recesses. The lamellae are designed here as solid disks or ring disks, whereby the solid or ring disks can also have cut out ring segments with a segment angle of approximately 90 °. Corresponding embodiments, in which disks are connected to one another in a clutch via elastic axial webs, are in particular from the publications U.S. 5,299,980 A , U.S. 5,238,454 A and US 2004/0176172 A1 known.

DE 102 11 484 A1 discloses a torsionally rigid shaft coupling with an annular flange, via which the shaft coupling can be coupled to a first machine part, and a hub arranged radially inward in the same transverse plane, via which the shaft coupling can be connected to a second machine part. In the radial space between the flange and the hub, L-shaped links extend on opposite sides in the circumferential direction, one leg of which extends radially outward from the hub, while the other leg of the L extends in the circumferential direction to the flange. The two links should form parallel link gears crossing each other. The shaft coupling is produced in one piece in an injection molding process from plastic, in particular a thermoplastic plastic or GRP.

DE 195 43 187 A1 discloses a coupling for the torsionally rigid transmission of a rotary movement, which is intended to enable compensation of misalignments of the machine parts connected to one another by means of the coupling. The coupling here has an annular base body that extends in a transverse plane. Two pairs of elastic L-shaped spring arms also extend from the base body in the transverse plane, spring arms of the same pair being arranged on opposite sides in the circumferential direction, while the different pairs are arranged offset by 90 ° in the circumferential direction. In each case one leg of the L-shaped spring arm extends tangentially from the annular base body, while the other leg of the L-shaped spring arm is oriented in the circumferential direction. In the end area facing away from the base body, the pairs of spring arms have axially oriented pins which are opposite to one another and by means of which they can be connected to bores in the machine parts to be coupled to one another via the coupling. The coupling is manufactured in an injection molding process, the material preferably being polyetheretherketone (PEEK) or polyaryletherketone (PAEK).

The pamphlets EP 317 564 B1 , U.S. 1,561,119 A and U.S. 3,068,666 A disclose compensating couplings in which the hubs are connected to one another via coupling elements forming helical springs.

The pamphlet U.S. 3,390,546 A describes the manufacture of a helical spring interposed between the hubs by making inclined slots in a tube, these slots should have a circumferential extension of approximately 270 °, whereby the helical springs also extend over a circumferential angle of approximately 270 °.

U.S. 5,041,060 A discloses a compensating coupling with two external, hub-side coupling parts and a central coupling part. The external coupling parts have lamellae that are connected to one another via axial webs. In contrast, the two lamellae of the central coupling part are connected to one another via two pairs of elastic wings arranged in the circumferential direction on opposite sides. The wings of a wing pair have a rectangular cross section, the longer side of which is oriented in the radial direction. The wings of a wing pair are designed in a straight line in a development of the lateral surface of the compensating coupling and opposite the Longitudinal axis inclined in opposite directions at an angle of approx. 20 °.

U.S. 4,203,305 A discloses a one-piece flexible compensating coupling which has an intermediate flange between two disk-shaped support bodies on the hub side. The disk-shaped support bodies on the hub side are each connected to the intermediate flange on opposite sides via two helical springs offset by 180 ° in the circumferential direction. The coil springs extend here over a circumferential angle in the range from 270 ° to 360 °. The cross-section of the coil springs is trapezoidal, with the wider base of the trapezoid facing the longitudinal axis of the compensating coupling.

DE 27 09 493 A1 discloses an elastic shaft coupling which is intended for speeds in the range of 6,000 to 25,000 revolutions per minute with the possibility of angular compensation of up to ± 1.5 °, the elastic shaft coupling also allowing a certain axial compensation movement. Such elastic shaft couplings are to be used in the drive train of a helicopter, whereby the elastic shaft coupling must have a low weight and must not fail in the case of the mechanical stresses acting in the drive train of the helicopter. The elastic shaft coupling has disc-shaped, spaced apart flanges. The flanges have bores located radially on the outside, distributed in the circumferential direction, via which they can be screwed to counter flanges of the shafts to be coupled to one another via the elastic shaft coupling. The flanges are connected to one another by elastic bands.

These bands each grip a flange uniformly over the circumference of the flanges and extend in a straight line between the two flanges, the extent of the bands at an acute angle of about 10 ° due to the axial offset of the two ends of the bands is inclined with respect to the circumferential direction. The ends of the bands are connected via ramps that keep the bands at a distance from the fastening screws and nuts for fastening the flanges to the mating flanges and are intended to reduce the bending stress in the bands by reducing the axial distance between the opposite ends of the bands. The flanges and the straps of the compensating coupling can be made of a composite material with high tensile strength and small flexural modulus, with fibers of the straps having high tensile strength being oriented in the direction of the longitudinal extension of the straps in order to ensure good transmission of the torque. The bands are designed in the shape of a circular ring segment with a relatively large radial extension, so that they should also provide radial rigidity. Alternatively, suggests DE 27 09 493 A1 suggest that the bands are not formed in the shape of a circular ring segment, but rather are straight, wherein the bands in this case can be composed of metallic lamellae. In this case, the flanges form radially outwardly extending extensions, between which the straight bands then extend.

OBJECT OF THE INVENTION

• - der Herstellungskosten,
• - der mechanischen Übertragungscharakteristik (insbesondere hinsichtlich des Torsionsmomentes, eines Ausgleiches des axialen Versatzes, des radialen Versatzes und/oder des Winkelversatzes) und/oder
• - der einsetzbaren Materialien und Herstellungsverfahren

verbessert ist.The present invention is based on the object of proposing a compensating coupling for coupling two machine parts, which with regard to

• - the production costs,
• the mechanical transmission characteristic (in particular with regard to the torsional moment, a compensation for the axial offset, the radial offset and / or the angular offset) and / or
• - the usable materials and manufacturing processes

is improved.

Furthermore, the invention is based on the object of proposing a method for producing a correspondingly improved compensating coupling and a core slide that can be used for this purpose.

SOLUTION

The object of the invention is achieved according to the invention with the features of the independent claims. Further preferred embodiments according to the invention can be found in the dependent claims.

DESCRIPTION OF THE INVENTION

The compensating coupling according to the invention has (at least) two disk-shaped support bodies. These disk-like support bodies are preferably a flange, a shoulder, a lamella, a circular disk or an annular disk of the compensating coupling.

The disk-shaped support bodies are connected to one another via a helical elastic coupling element. The elastic coupling element should make it possible to compensate for an axial offset, a radial offset and / or an angular offset between the machine parts. Depending on the design of the elastic coupling element the torsional moment can be transmitted as stiffly as possible, or the torsional moment can be transmitted elastically.

According to the prior art, helical coupling elements are designed as helical springs in which the pitch of the helix is constant. As a result, the cross-sections of the helical springs as a result of the forces introduced into the helical spring in the end areas (which also includes moments) are stressed equally over the entire extent of the helical spring, which means that the scope for the deformation process of the helical spring is limited to the length the coil spring, the material used and the cross section of the coil spring is limited.

According to the invention, it is proposed that the helical elastic coupling element has partial areas that are curved or angled in different directions in one development. This configuration according to the invention has the consequence that the partial areas of the elastic coupling element are acted upon differently, whereby the different partial areas can be deformed differently as a result of the forces introduced into the coupling elements in the end areas.

The effect according to the invention is to be explained using a preferred embodiment of the invention, in which a sub-area of the coupling elements is formed by a central section which is exclusively oriented in the circumferential direction and is thus arranged in a transverse plane of the compensating coupling, while two further sub-areas of the coupling elements are formed by end sections which are angled or curved with respect to the central section and extend (at least with a directional component) from the central section in opposite axial directions. Furthermore, in this case, the end sections extend in a different direction than the middle section.

The end sections can thus each be angled or curved starting from the central section in the direction of an associated disk-shaped support body and connected to the respective support body in the end region facing away from the central section in a connecting region. It is possible that in the direction of the longitudinal extension of the coupling element, the course from one end section over the middle section to the other end section has a turning point, a transition “from a right curve to a left curve” or a sudden change in alignment in different directions.

1. a) Der Mittelabschnitt wird in Folge eines zu übertragenden Torsionsmomentes der Ausgleichskupplung je nach Richtungssinn des Torsionsmomentes mit einer Zug- oder Druckspannung beaufschlagt, die somit je nach Gestaltung der Steifigkeit des Mittelabschnittes zu einer Längenänderung des Mittelabschnittes in Umfangsrichtung führt. Auch für den Ausgleich eines axialen Versatzes oder eines Winkelversatzes zwischen den Maschinenteilen kommt es zu einer Beanspruchung der Mittelabschnitte auf Biegung um eine radial orientierte Achse.
2. b) Hingegen verfügen in Folge der Abwinklung oder Krümmung der Endabschnitte diese über eine Axialkomponente sowie eine Umfangskomponente. Die Umfangskomponente der Endabschnitte wird hierbei so beansprucht wie dies für den Mittelabschnitt beschrieben wurde. Hingegen wird die Axialkomponente der Endabschnitte für die Übertragung eines Torsionsmomentes auf Biegung um eine radial orientierte Achse beansprucht, während die Axialkomponente der Endabschnitte für den Ausgleich eines axialen Versatzes mit einer Zug- oder Druckkraft beaufschlagt wird und in Folge eines radialen Versatzes oder eines Winkelversatzes auf Biegung um eine radial orientierte Achse beansprucht wird.

For this exemplary embodiment of the partial areas curved or angled in different directions, on the one hand the middle section and on the other hand the end sections assume different functions:

1. a) As a result of a torsional moment of the compensating coupling to be transmitted, the central section is subjected to tensile or compressive stress depending on the direction of the torsional moment, which thus leads to a change in length of the central section in the circumferential direction, depending on the design of the rigidity of the central section. To compensate for an axial misalignment or an angular misalignment between the machine parts, the central sections are also subjected to bending around a radially oriented axis.
2. b) On the other hand, as a result of the angling or curvature of the end sections, they have an axial component and a circumferential component. The circumferential component of the end sections is stressed as described for the middle section. In contrast, the axial component of the end sections is used to transmit a torsional moment to bending around a radially oriented axis, while the axial component of the end sections is subjected to a tensile or compressive force to compensate for an axial offset and, as a result of a radial offset or an angular offset, to bending is claimed about a radially oriented axis.

Through the targeted design of the bend, the curvature of the cross-sections and the courses of the end sections on the one hand and the cross-sections and the length of the middle section on the other hand, a specific design of the characteristics of the compensating coupling (in particular for the transmission behavior of the torsional moment and the compensation of the axial offset, radial Offset and / or the angular offset).

(The same applies if - as explained for the example - a center section oriented in the circumferential direction and angled or curved end sections are not present, but the helical elastic coupling element has any curved or angled partial areas in a development in different directions.

The helical elastic coupling element is preferably connected in both end areas (in particular in the end areas of the angled or curved end sections) to adjacent disk-shaped support bodies in connection areas. Here are the two connection areas with which a coupling element with the adjacent disc-shaped support bodies is connected, both in the axial direction and in the circumferential direction spaced apart.

There are many possibilities for extending the helical elastic coupling element in the circumferential direction. The helical elastic coupling element preferably extends over a circumferential angle which is smaller than 180 °, in particular smaller than 150 °, 140 ° or 130 °. On the one hand, such a choice of the circumferential angle has shown that the desired transmission behavior of the compensating coupling results in a good relationship on the one hand to the torsional rigidity of the compensating coupling and on the other hand to the ability to compensate for any misalignment. On the other hand, it has been shown that selecting such a small circumferential angle can result in a reduced material input and a reduced weight of the compensating coupling. Finally, such a small circumferential angle also enables several elastic coupling elements to be arranged distributed over the circumference between adjacent disk-shaped support bodies in a mechanical parallel connection without these colliding with one another or their structural design being restricted as a result of an adjacent coupling element.

The number of coupling elements used between adjacent disk-shaped support bodies is arbitrary. So only one coupling element can be used. It is also possible, however, for two coupling elements, three coupling elements, four coupling elements, five coupling elements or more coupling elements to be arranged between the adjacent disk-shaped support bodies. In this case, several coupling elements used can be arranged distributed uniformly or unevenly over the circumference.

There are many options for designing the geometry of the coupling elements. Here, the coupling element can have a constant or changing radial extent in a projection in a transverse plane. It is also possible for the coupling element to be designed in a spiral shape in this projection, so that its radius from the longitudinal axis of the compensating coupling can change. For a particular embodiment of the invention, however, the coupling element is designed in the shape of a circular ring segment in a projection in a transverse plane. Here, only a partial area or the central section of the coupling element can be in the shape of a circular ring segment. Preferably, however, all of the partial areas or both the middle section and the end sections are designed together in the shape of a circular ring segment.

For a special proposal of the invention, the compensating coupling has three coupling elements which are arranged between adjacent disk-shaped support bodies and are arranged distributed uniformly in the circumferential direction. In this case, at least one coupling element, which is then designed in particular in the shape of a circular ring segment, extends over a circumferential angle of 120 ° to 130 °. In this case, the angled or curved end sections of coupling elements adjacent in the circumferential direction can be guided past one another as a result of the angling or curvature.

There are many possibilities for designing the cross section of the coupling element. Thus, the coupling elements can have a constant or changing cross section over the longitudinal extent of the same. To name only a few non-limiting examples, the cross-sections can be rectangular, trapezoidal, circular, oval or contoured in any curve. For a particular proposal of the invention, the end sections of the coupling elements (at least partially) have a greater wall thickness than the central section. In this case, the wall thickness of the end section is preferably increased in the connection area with the disk-shaped support body in order to enable uniform introduction of forces into the disk-shaped support body in the connection area with the enlarged cross-section without stress peaks and with reduced stress due to the enlarged transfer surface. By equipping the end sections with a greater wall thickness, they can also be specifically equipped with a high geometrical moment of inertia, so that their resilience can be reduced when subjected to a bend.

In the event that the end sections have a greater wall thickness than the central section, in one embodiment of the compensating coupling there can be a recess in the area of the end sections, by means of which an accumulation of material can be reduced as a result of the greater wall thickness. The configuration can have any cross-sectional geometry and orientation. For example, the recess can be configured as a radial recess which cannot extend continuously from the outside of the end section or can also be configured continuously in the radial direction. It is also possible for the recess to divide the end sections into two webs, which are then connected to the disk-shaped support body in the connection area.

The compensating coupling according to the invention can be produced by means of any manufacturing method, the different components of the compensating coupling also being made from different ones Materials and can be manufactured in individual manufacturing processes. According to a proposal according to the invention, the disk-shaped support bodies and the coupling elements are in an injection molding process, in an additive process (for example, a 3-D laser printing, laser melting, etc. (see also the textbook on usable additive processes: Berger, Uwe; Hartmann , Andreas, Schmid, Dietmar: Additive Manufacturing Processes, first edition, Verlag Europa-Lehrmittel) or in a sintering process. The disk-shaped support bodies on the one hand and the coupling elements on the other hand can be manufactured individually or in one piece using the processes mentioned.

According to a proposal of the invention, disk-shaped support bodies and / or the coupling elements are made of plastic in the compensating coupling. It is possible here that a fiber-reinforced plastic can also be used, whereby preferably no endless fibers are used, whereby, for example, fibers can be used whose length is less than 5 mm, 4 mm, 3 mm or 2 mm or whose length is also less than 1 mm up to a length of 1/10 millimeter. The use of glass fibers or carbon fibers is possible here, for example. Furthermore, a thermoplastic material, a thermosetting plastic (possibly fiber-reinforced), an elastomer or a plastic material PA66, PA6, POM and the like can be used as plastic. Find use.

The invention comprises embodiments in which the compensating coupling has only two disc-shaped support bodies carried by the two hubs, which are connected to one another via coupling elements. For a further proposal of the invention, however, a disk-shaped support body designed as an intermediate support body is arranged in the compensating coupling between two disk-shaped support bodies on the hub side. In this case, the two disc-shaped support bodies on the hub side can each be connected to the intermediate support body on one side of the intermediate support body via coupling elements. Alternatively, the invention proposes that between two hub-side disk-shaped support bodies at least two disk-shaped support bodies designed as intermediate support bodies are arranged. In this case, the hub-side disk-shaped support bodies are each connected to an adjacent intermediate support body via coupling elements, while adjacent intermediate support bodies are connected to one another via coupling elements.

By using at least one intermediate support body, the number of coupling elements arranged between the two hubs can be increased. Coupling elements that are interposed between two adjacent disk-shaped support bodies are arranged in a mechanical parallel connection, while the coupling elements that are disposed between different pairs of adjacent disk-shaped support bodies act together in mechanical series connection. Thus, by using a suitable number of intermediate support bodies, further influence can be exerted on the design of the stiffness behavior and the compensation behavior of the compensating coupling. On the other hand, by using at least one intermediate support body, an inclined position of an intermediate support body relative to the hub-side disk-shaped support bodies can be made possible, which is particularly advantageous for compensating for a radial offset and / or an angular offset between the machine parts.

Both for the use of disk-shaped support bodies on the hub side as well as for the use of at least one intermediate support body, the disk-shaped support bodies can be used to specify the mechanical boundary conditions of the coupling elements. While a helical coupling element generally has the tendency to spring up or down when a torsional moment acts, which changes the radius of the helical coupling element, the disk-shaped support bodies keep the radius of the connection area of the coupling element with the disk-shaped support bodies constant, so that the use of the disk-shaped support bodies Support body for the purpose of radial support of the end areas of the coupling elements can also influence the stiffness behavior and compensation behavior of the compensating coupling.

Coupling elements connected to an intermediate support body on different sides can be arranged offset from one another in the circumferential direction. For a proposal of the invention, however, pairs of coupling elements arranged on different sides of an intermediate support body are connected to the intermediate support body at approximately the same circumferential extent. This means that between the coupling elements arranged on the different sides, the force does not have to be transmitted over a circumferential area of the intermediate support body, but instead the forces are transferred directly from the coupling element on one side via the intermediate support body to the coupling element on the other side. Here, the feature “approximately with the same circumferential extent” includes an arrangement with exactly the same circumferential extent, but also including only a partial overlap of the circumferential extent of the connection areas or a deviation of ± 20 ° with regard to the circumferential extent thereof.

If the coupling elements (deviating from the explanations in the last paragraph) are arranged offset in the circumferential direction on different sides of the intermediate support body, the peripheral area of the intermediate support body, which is arranged between the coupling elements, forms an “interruption” of a helical course of the two coupling elements. For a proposal of the invention, for which the coupling elements are connected to the intermediate support body at approximately the same circumferential extent, pairs of coupling elements arranged on both sides of an intermediate support body extend helically around a longitudinal axis, with the angled or curved end sections in particular being helical, while entirely possible is that the middle sections of the elastic coupling element also form an interruption of the helical course. It is possible that the angled or curved end sections of the pair of coupling elements lie on a straight line.

There are various embodiments known per se to the person skilled in the art for the design of the hub of the compensating coupling. For example, a connection can be made via a feather key, a wedge connection or some other form-fitting connection. It is also possible for the torsional moment to be transmitted frictionally between the hub and the machine part. An axial frictional connection can be brought about here, for example via a shaft nut. Preferably, however, the hub can be braced in the radial direction with a shaft stub of the machine part.

Another solution to the problem on which the invention is based is devoted to designing a method for manufacturing a compensating clutch, as has been explained above. According to the invention, the compensating coupling is produced in an injection molding process.

It is possible, for example, that a cavity formed with two halves is used here, the cavity being divided by the halves in a central transverse plane, with which the two halves can be demolded when the halves move axially away from one another. The two halves here provide the outer contour of a part of the compensating coupling, in particular the end faces and lateral surfaces of the hubs and also a possibly contoured end face of the hubs. It is possible that an insert is also used in the cavity, which defines a continuous or stepped inner bore of the compensating coupling.

The compensating coupling according to the invention has interspaces which are delimited both by facing end faces of adjacent disk-shaped support bodies and by facing surfaces of adjacent coupling elements. The radially demolded core slides used in the method according to the invention have a lateral surface which forms the aforementioned spaces. Thus, according to the invention, the core slides define adjacent disk-shaped support bodies in partial circumferential regions as well as adjacent coupling elements on different sides.

It is possible for a single core slide to be used for each of the spaces mentioned. For a further proposal of the invention, however, the core slide has two core slide parts. Here, each core slide part is responsible for the formation of a space on different sides of an intermediate support body. Thus, the two core slide parts of the core slide on different sides of an intermediate support body each define both adjacent disk-shaped support bodies in a partial circumferential area and different sides of adjacent coupling elements.

Another solution to the problem on which the invention is based proposes the use of a core slide, as has been described above, which can be used for the production of a compensating coupling with the structural features explained above. The core slide according to the invention has at least one core slide part, the outer surface of which corresponds both to the contours of partial circumferential areas of adjacent disk-shaped support bodies and to the contours of different sides of adjacent coupling elements.

For a special proposal of the invention, a compensating coupling can be produced with two disc-shaped support bodies on the hub side and a disk-shaped support body designed as an intermediate support body, as well as three coupling elements arranged between adjacent disk-shaped support bodies with only three core slides that can be pushed in and out evenly in the circumferential direction.

Advantageous further developments of the invention emerge from the patent claims, the description and the drawings. The advantages of features and of combinations of several features mentioned in the description are only exemplary and can come into effect alternatively or cumulatively without the advantages necessarily having to be achieved by embodiments according to the invention. Without changing the subject matter of the attached claims, the following applies with regard to the Disclosure content of the original application documents and the patent the following: Further features can be found in the drawings - in particular the illustrated geometries and the relative dimensions of several components to one another and their relative arrangement and operative connection. The combination of features of different embodiments of the invention or of features of different patent claims is also possible, deviating from the selected back-references of the patent claims, and is hereby suggested. This also applies to features that are shown in separate drawings or mentioned in their description. These features can also be combined with features of different patent claims. Features listed in the patent claims for further embodiments of the invention can also be omitted.

The number of features mentioned in the claims and the description are to be understood in such a way that precisely this number or a greater number than the specified number is present without the need for the explicit use of the adverb “at least”. Thus, when a coupling element or a support body is mentioned, for example, this is to be understood to mean that precisely one coupling element or support body, two coupling elements or support bodies or more coupling elements or support bodies are present. These characteristics can be supplemented by other characteristics or be the only characteristics that make up the product in question.

The reference signs contained in the claims do not represent a restriction of the scope of the subject matter protected by the claims. They only serve the purpose of making the claims easier to understand.

Figure list

• 1 bis 4 zeigen stark schematisiert ein Detail einer abgewickelten Darstellung einer Ausgleichskupplung mit scheibenförmigen Tragkörpern und zwischen den scheibenförmigen Tragkörpern angeordneten Koppelelementen.
• 5 zeigt eine Ausgleichskupplung in einer Seitenansicht.
• 6 zeigt die Ausgleichskupplung gemäß 5 in einer räumlichen Darstellung schräg von vorne.
• 7 zeigt die Ausgleichskupplung gemäß 5 und 6 in einer Vorderansicht.
• 8 zeigt eine Ausgleichskupplung in einer räumlichen Darstellung.
• 9 und 10 zeigen eine Herstellung einer Ausgleichskupplung mit drei Kernschiebern.
• 11 zeigt einen Kernschieber in einem Detail XI gemäß 10.

In the following, the invention is further explained and described with reference to preferred exemplary embodiments shown in the figures.

• 1 to 4th show a highly schematic detail of a developed representation of a compensating coupling with disk-shaped support bodies and coupling elements arranged between the disk-shaped support bodies.
• 5 shows a compensating coupling in a side view.
• 6th shows the compensating coupling according to 5 in a three-dimensional representation diagonally from the front.
• 7th shows the compensating coupling according to 5 and 6th in a front view.
• 8th shows a compensating coupling in a three-dimensional representation.
• 9 and 10 show a manufacture of a compensating coupling with three core slides.
• 11 shows a core slide in a detail XI according to FIG 10 .

FIGURE DESCRIPTION

1 to 4th show a compensating coupling in a highly schematic manner in a development 1 with two disc-shaped support bodies 2 , 3 which are coupled to one another via coupling elements 4a, 4b, 4c. With the disk-shaped support bodies 2 , 3 it can be a disk-shaped support body on the hub side or an additional disk-shaped intermediate support body.

The coupling elements 4a, 4b, 4c are each formed identically and in the same way with the disk-shaped support bodies 2 , 3 connected. In the following, the design and connection using a coupling element is therefore merely an example 4th explained, whereby this then applies to all coupling elements 4a, 4b, 4c. In the figures, identifications with reference symbols are then made exclusively for the coupling element 4a.

The connection of the coupling elements 4th with the disk-shaped support bodies 2 , 3 takes place in connection areas 5 , 6th . The coupling elements have end sections 7th , 8th as well as a middle section 9 .

For the embodiment according to 1 are both the end sections 7th , 8th as well as the middle section 9 straight in the development. The end sections 7th , 8th are oriented parallel to each other. Opposite front sides 10 , 11 the disc-shaped support body 2 , 3 are the end sections 7th , 8th with an angle 12 angled. For one embodiment, this angle is 12 between 20 ° and 70 °, for example between 30 ° and 60 °. Over an angle 13 that goes along with the angle 12 180 ° results, go the end sections 7th , 8th in the middle section 9 over.

As in 1 can be seen, connection areas 5a, 6b; 5b, 6c and 5c, 6a of adjacent coupling elements 4a, 4b, 4c with the same circumferential extent (according to 1 at 0 ° or 360 °, at 120 ° and at 240 °).

That too 1 What has been said basically also applies to the following exemplary embodiments, unless something different is apparent from the figures or differences are explained in the description.

According to 2 are the middle sections 9 corresponding 1 straight and oriented exclusively in the circumferential direction. But here are the endings 7th , 8th not straightforward. Rather, they are curved or arc-shaped. The end sections 7th , 8th go without kinks or angles 13 in the middle section 9 about, but start at an angle 12 in the area of the front sides 10 , 11 the disc-shaped support body 2 , 3 .

For the embodiment according to 3 are the end sections 7th , 8th and the middle section 9 straightforward. However, this is the middle section 9 not exclusively oriented in the circumferential direction, but rather it also has an axial component. The coupling elements 4th run here in a simplifying description in a z-shape or meandering back and forth.

The same applies to the exemplary embodiment according to 4th . While according to 3 the end sections 7th , 8th have a length such that it extends over the middle between the end faces 10 , 11 the disc-shaped support body 2 extend out, so that the coupling element in the area of the central section 9 must extend back again, have the end sections 7th , 8th according to 4th over a longitudinal extent in such a way that it is already in front of the centers between the end faces 10 , 11 the disc-shaped support body 2 , 3 end, with which the middle section then the coupling element 4th across the middle between the end faces 10 , 11 continues. In contrast to the embodiment according to 3 find according to 4th not three coupling elements 4a, 4b, 4c but rather four coupling elements 4a, 4b, 4c insert. Here, the coupling elements extend over a circumferential angle greater than 90 °, so that adjacent coupling elements overlap in the circumferential direction with an axially offset arrangement.

Associated connecting areas 5a, 6b; 5b, 6c, 5c, 6d and 5d, 6a are not arranged with the same circumferential extent, but are arranged offset from one another.

For those skilled in the art it is apparent that the 1 to 4th show only schematically possibilities for the number, distribution and configuration of the coupling elements. Mixed forms of the illustrated embodiments or a different number, arrangement in the circumferential direction and design of the coupling elements are possible within the scope of the invention, provided that the coupling elements have partial areas curved or angled in different directions in one development.

If you follow the course of a coupling element 4th from one end face 10 of a disk-shaped support body 2 towards the adjacent face 11 of the other disk-shaped support body 3 , so the coupling element has 4th over sections with curvatures with different signs. This goes for a straight design of the end sections 7th , 8th the inclination of an inclination in the area of the end section 7a with a first sign via a jump over into the inclination of the central section 9 , the inclination being 0 here, and with the transition from the central section 9 to the end section 8th the slope jumps to a slope, the amount of which corresponds to the slope of the end section 7th and which has a second sign which is opposite to the first sign. According to the embodiment according to 2 the inclinations of the end sections change 7th , 8th of the maximum inclination in the area of the end faces 10 , 11 continuously up to slope 0 in the area of the middle section 9 .

5 to 7th show a structural design of a compensating coupling 1 . This compensating coupling 1 has hubs 14th , 15th . The hubs 14th , 15th each have a circumferential shoulder in the end area facing one another, the hub-side disk-shaped support body 16 , 17th form. Another disk-shaped support body 18th is in the middle between the two disc-shaped support bodies 16 , 17th arranged. The disk-shaped support body 16 , 17th , 18th extend in parallel transverse planes. Between the disk-shaped support bodies 16 , 18th are, here evenly distributed over the circumference, three coupling elements 4a, 4b, 4c arranged. Correspondingly are between the disk-shaped support bodies 17th , 18th Three further coupling elements 4d, 4e, 4f are arranged distributed uniformly in the circumferential direction. Here, the disk-shaped support bodies correspond 16 , 18th with the coupling elements 4a, 4b, 4c arranged between them on the one hand and the disc-shaped support bodies 17th , 18th with the coupling elements 4d, 4e, 4f arranged between them, on the other hand, basically the basic sketches with the disk-shaped support bodies 2 , 3 according to 1 to 4th .

For the structural design according to 5 the coupling elements are designed to be more complex. The coupling elements 4th have a central section 9 with constant wall thickness. For the exemplary embodiment is the middle section 9 formed in the shape of a circular ring segment in a transverse plane and has a rectangular half-cross section here. The middle section 9 goes over into curved end areas 7th , 8th . The end areas here have a cross-section that is thickened 19th towards the front 10 enlarged. On the front 10 facing side is the middle section 9 via a U-shaped contour without a kink over into the face 10 of the disk-shaped support body 16 . In contrast, the middle section goes 9 on the disk-shaped support body 16 turned away Side over a contour without a kink in the front side 10 of the disk-shaped support body 16 about, which corresponds approximately to a half-sine function between the two maxima of the sine function. For the illustrated embodiment is in the area of the thickening 19th a recess 20th available. The recess 20th has a circular or oval cross-section. The recess 20th is preferably with its longitudinal axis in the radial direction of the compensating coupling 1 oriented. For the illustrated embodiment, the recess 20th designed as a blind hole recess, this also by the coupling element 4th can go through. That with regard to the end section 7th What has been said applies accordingly to the end section 8th . It is possible that both sides of the recess 20th two bars 33 , 34 are formed, which in the connection area 5 , 6th spaced from each other with the end faces 10 , 11 the disc-shaped support body 2 , 3 or. 16 , 17th , 18th are connected.

• - die dem scheibenförmigen Tragkörper 2, 16 zugewandte Stirnseite des Mittelabschnitts 9c,
• - die U-förmige Kontur der Verdickung 19 oder den Endabschnitt 7c,
• - die Stirnseite 10 des scheibenförmigen Tragkörpers 2, 16,
• - die halbsinusförmige Kontur der Verdickung 19 des Koppelelements 4b oder den Endabschnitt 7b,
• - die dem scheibenförmigen Tragkörper 2, 16 abgewandte Stirnseite des Mittelabschnitts 9b,
• - die U-förmige Kontur der Verdickung 19 des Endabschnitts 8b oder den Endabschnitt 8b,
• - die Stirnseite 11 des scheibenförmigen Tragkörpers 3, 18 und
• - die halbsinusförmige Kontur der Verdickung 19 des Endabschnitts 8c bzw. den Endabschnitt 8c.

Between the disk-shaped support bodies 2 , 3 or. 16 , 18th are three spaces open radially inwards and radially outwards 21st formed, the contour of which is in a development with an elastic deformation of the coupling elements 4th changed. A gap 21a is exemplified in FIG 1 highlighted by hatching. This is exemplified using a space 21a in FIG 1 or 5 explained: The space 21a is limited by

• - The disk-shaped support body 2 , 16 facing end face of the middle section 9c,
• - the U-shaped contour of the thickening 19th or the end section 7c,
• - the front 10 of the disk-shaped support body 2 , 16 ,
• - the semi-sinusoidal contour of the thickening 19th of the coupling element 4b or the end section 7b,
• - The disk-shaped support body 2 , 16 facing away end of the middle section 9b,
• - the U-shaped contour of the thickening 19th of the end section 8b or the end section 8b,
• - the front 11 of the disk-shaped support body 3 , 18th and
• - the semi-sinusoidal contour of the thickening 19th of the end section 8c or the end section 8c.

Thus the gap has 21st between the disk-shaped support bodies 2 , 3 or. 16 , 18th and the coupling elements 4b, 4c each have a rectilinear subspace in the development, these subspaces being connected to one another via an inclined or curved subspace.

The compensating coupling 1 has a continuous recess or hole 22nd . In the area of the hubs 14th , 15th can in the hole 22nd one stub shaft each over the compensating coupling 1 machine parts to be connected are introduced.

For the illustrated embodiment, the hubs have 14th , 15th each via three hollow cylinder segments 23a, 23b, 23c, which are separated from one another by radially oriented slots 24a, 24b, 24c. From one end 25th Honeycomb-like or chamber-like recesses extend here 26th into the hollow cylinder segments 23 . Only in the area of the slots 24 interrupted jacket surface of the three hollow cylinder segments 23 a clamping element, in particular a clamping ring, can be pushed on, with the bracing of which the hollow cylinder segments 23 can be acted upon radially inward, so that inner surfaces of the hollow cylinder segments 23 can be braced with a lateral surface of the stub shaft of the machine part for frictional transmission of a torsional moment.

For the embodiment according to 8th is located between the disk-shaped support bodies 16 , 17th , 18th just a coupling element 4th . It may be that there is only a single such coupling element. However, it is also possible, with an appropriate design, for several such coupling elements between the adjacent disk-shaped support bodies 16 , 18th or. 18th , 17th are arranged, then in 8th other coupling elements 4th a coupling element shown to simplify the representation and to better recognize the course 4th are not shown.

9 shows the manufacture of a compensating coupling 1 by means of three core slides 27 , 28 , 29 in an injection molding process. Next to the core slide 27 , 28 , 29 the form of the compensating coupling is specified 1 by a shape which is half in a transverse plane of the compensating coupling 1 is divided and through which the core slide extends in the radial direction 27 , 28 , 29 extend. These two mold halves are in 9 not shown. The mold halves in particular have partial cavities for specifying the contour of the hubs 14th , 15th with the slots 24 and the recesses 26th and the contouring of the disk-shaped support body 16 , 17th in the area of the end faces, which the hubs 14th , 15th are facing. In 9 these mold halves have already been removed and the core slide remains 27 , 28 , 29 with the compensating coupling made in the injection molding process 1 . As in 10 can be seen, the core slide 27 , 28 , 29 be pulled out in the radial direction.

• Der Kernschieber 27 verfügt über drei in unterschiedlichen Querebenen angeordnete Zylindersegmentflächen 30, deren Umfangswinkel 120° beträgt. Entsprechende Zylindersegmentflächen 30 der drei Kernschieber 27, 28, 29 ergänzen sich in geschlossenem Zustand der Kernschieber 27, 28, 29 zu drei zylindrischen Formflächen, welche die Mantelflächen der scheibenförmigen Tragkörper 16, 17, 18 vorgeben. Zwischen den Zylindersegmentflächen 30 ist dann jeweils ein Kernschieberteil 31, 32 angeordnet, dessen Geometrie der zuvor beschriebenen Geometrie eines Zwischenraums 21 der Ausgleichskupplung 1 entspricht. Anders gesagt entspricht die Außenfläche der Kernschieberteile 31, 32 jeweils den Außenflächen der Konturen von Teilumfangsbereichen benachbarter scheibenförmiger Tragkörper sowie den Konturen unterschiedlicher Seiten benachbarter Koppelelemente.

The design of the compensating coupling 1 forming mold surfaces of the core slide 27 , 28 , 29 is exemplified on the basis of detail XI of the core slide 27 according to 11 explained:

• The core pusher 27 has three cylinder segment surfaces arranged in different transverse planes 30th whose circumferential angle is 120 °. Corresponding cylinder segment surfaces 30th of the three core pushers 27 , 28 , 29 The core slide complement each other when closed 27 , 28 , 29 to three cylindrical shaped surfaces, which are the outer surfaces of the disk-shaped support body 16 , 17th , 18th pretend. Between the cylinder segment surfaces 30th is then a core slide part 31 , 32 arranged, the geometry of which is the geometry of an intermediate space described above 21st the compensating coupling 1 corresponds. In other words, the outer surface corresponds to the core valve parts 31 , 32 the outer surfaces of the contours of partial circumferential areas of adjacent disk-shaped support bodies and the contours of different sides of adjacent coupling elements.

As from the 9 to 11 can be seen by means of three core slides 27 , 28 , 29 and thus six core slide parts 31 , 32 a default of six spaces 21st take place for the shaping of a compensating coupling 1 with three disc-shaped support bodies 16 , 17th , 18th , between adjacent disk-shaped support bodies 16 , 17th , 18th three coupling elements are arranged.

The coupling explained here is preferably used for coupling a machine part with a servomotor.

As a result of the design of the coupling elements 4th Under certain circumstances, this also results in a desired anisotropic rigidity behavior of the compensating coupling 1 .

It is possible that a number of compensating couplings 1 is manufactured and offered for different purposes and / or requirements. The compensating couplings 1 be specifically adapted to the torques to be transmitted and the necessary compensation of an axial offset, a radial offset or an angular offset. An adjustment is made by choosing the outer diameter of the compensating coupling 1 , the dimensioning of the coupling elements 4th , the number of coupling elements arranged between adjacent disk-shaped support bodies 4th , the number of disc-shaped support bodies used 16 , 17th , 18th , the material of the disk-shaped support body 16 , 17th , 18 and the coupling elements 4th and the cross-sections and courses of the coupling elements 4th .

The use of at least one disk-shaped support body forming an intermediate support body 18th can lead to the fact that a radial offset of the machine parts to be coupled is compensated by an inclined position of the support body 18th . If, on the other hand, no such radial compensation is desired, the compensating coupling 1 is preferably configured with only two disk-shaped support bodies without an intermediate support body. Such a compensating coupling designed without an intermediate support body 1 can be used, for example, if a torque measuring shaft is arranged in a cardanic W arrangement between two components, each via a compensating coupling 1 is coupled to a machine part. In this case, a radial compensation option would lead to an undefined movement of the torque shaft.

The axial extent of the curved or angled end sections is preferably 7th , 8th at least 5% (for example at least 10%, at least 15%, at least 20%) of the longitudinal extent of the central section 9 .

An embodiment is preferred in which the interstices 21st are not filled with material, with which these free deformation paths for the coupling elements 4th provide. For a modified embodiment, the spaces 21st (except for the one through the compensating coupling 1 recess extending therethrough 22nd ) also be filled with a material which preferably has a rigidity that is at least one order of magnitude smaller than the rigidity of the material of the coupling elements 4th and the support body 16 , 17th , 18th . About that in the interstices 21st arranged material can further influence the mechanical characteristics of the compensating coupling 1 respectively. It is also possible that dirt, oil and the like are deposited in the spaces through this material 21st is avoided and a closed cylindrical outer surface of the compensating coupling is guaranteed. A semi-finished product of a compensating coupling can be used for production 1 like this in 5 is shown, are inserted into another cavity, which specifies the aforementioned cylindrical outer surface of the compensating coupling, with the subsequent injection of the material into the spaces 21st .

For a non-limiting exemplary embodiment, the compensating coupling has 1 over an axial length of 70 mm, while the diameter of the disk-shaped support body 16 , 17th , 18 is 60 mm. In this case, the length of the middle sections is 9 20 mm. The axial extent of the end sections 7th , 8th is 10 mm, while the wall thickness of the central sections 9 5 mm. For this exemplary embodiment, however, deviations from individual or all of the aforementioned dimensions by a maximum of +/- 30% (preferably a maximum of +/- 20% or a maximum of +/- 10%) are also possible. Without this necessarily being the case, further dimensions of the compensating coupling can 1 according to the relative dimensions of the compensating coupling 1 be designed according to the dimensions in 5 to 7th can be taken.

It is also possible within the scope of the present invention that dimensions of the end sections 7th , 8th are chosen such that the stiffness of the end sections 7th , 8th is an order of magnitude greater than the stiffness of the central section 9 . In this case, the transmission characteristic of the compensating clutch 1 exclusively or predominantly from the middle section 9 certainly.

List of reference symbols

1

Compensating coupling

2

disc-shaped support body

3

disc-shaped support body

4th

Coupling element

5

Connection area

6

Connection area

7th

End section

8th

End section

9

Middle section

10

Face

11

Face

12th

angle

13

angle

14th

hub

15th

hub

16

disc-shaped support body

17th

disc-shaped support body

18th

disc-shaped support body

19th

thickening

20th

Recess

21st

Space

22nd

drilling

23

Hollow cylinder segment

24

slot

25th

Face

26th

Recess

27

Core slide

28

Core slide

29

Core slide

30th

Cylinder segment surface

31

Core slide part

32

Core slide part

33

web

34

web

Claims (17)

Compensating coupling (1) for coupling two rotating machine parts, the compensating coupling (1) enabling a transmission of a torsional moment and a compensation of an axial offset, a radial offset and / or an angular offset between the machine parts, with two disk-shaped support bodies (2, 3; 16, 17, 18), which are connected to one another via a helical elastic coupling element (4), characterized in that the helical elastic coupling element (4) has partial areas which are curved or angled in different directions in a development so that the partial areas of the elastic coupling element (4) can be acted upon differently, with the result that the different partial areas can be deformed differently as a result of the forces introduced into the coupling elements in the end areas. Compensating coupling (1) Claim 1 , characterized in that the at least one elastic coupling element (4) a) a circumferentially extending middle section (9) and b) angled or curved end sections (7, 8) which extend in opposite axial directions and each in one Connection area with a disk-shaped support body (2, 3; 16, 17, 18) are connected. Compensating coupling (1) Claim 1 or 2 , characterized in that the helical elastic coupling element (4) extends over a circumferential angle which is smaller than 180 °. Compensating coupling (1) according to one of the preceding claims, characterized in that at least two coupling elements (4a, 4b, 4c) are arranged distributed over the circumference. Compensating coupling (1) according to one of the preceding claims, characterized in that the at least one coupling element (4) are designed in the shape of a circular ring segment in a projection into a transverse plane. Compensating coupling (1) according to one of the preceding claims, characterized characterized in that the at least one coupling element (4) extends over a circumferential angle of 110 ° to 130 ° and / or between two disc-shaped support bodies (2, 3; 16, 18; 18, 17) three coupling elements (4a, 4b, 4c; 4d, 4e, 4f) are arranged distributed uniformly in the circumferential direction. Compensating coupling (1) according to one of the Claims 2 to 6th , characterized in that the end sections (7, 8) have a greater wall thickness than the central section (9). Compensating coupling (1) Claim 7 , characterized in that the end sections (7, 8) have a recess (20). Compensating coupling (1) according to one of the preceding claims, characterized in that the disc-shaped support bodies (2, 3; 16, 17, 18) and the coupling elements (4) a) in an injection molding process, b) an additive process or c) in one Sintering processes are made. Compensating coupling (1) according to one of the preceding claims, characterized in that the disk-shaped support bodies (2, 3; 16, 17, 18) and / or the coupling elements (4) are / is made of plastic. Compensating coupling (1) according to one of the preceding claims, characterized in that a) a disk-shaped support body (18) designed as an intermediate support body is arranged between two hub-side disk-shaped support bodies (16, 17) and the hub-side disk-shaped support bodies (16, 17) via coupling elements ( 4a, 4b, 4c; 4d, 4e, 4f) each on one side of the disk-shaped support body (18) formed as an intermediate support body are connected to the disk-shaped support body (18) formed as an intermediate support body, or b) between two hub-side disk-shaped support bodies at least two formed as an intermediate support body disk-shaped support bodies are arranged and the hub-side disk-shaped support bodies are connected via coupling elements to an adjacent disk-shaped support body formed as an intermediate support body and adjacent disk-shaped support bodies formed as an intermediate support body are connected to each other via coupling elements are connected. Compensating coupling (1) Claim 11 , characterized in that pairs of coupling elements (4a, 4b, 4c; 4d, 4e, 4f), which are arranged on both sides of a disk-shaped support body (18) designed as an intermediate support body, have approximately the same circumferential extent as the disk-shaped support body designed as an intermediate support body ( 18) are connected, with approximately the same circumferential extent means an arrangement with exactly the same circumferential extent, means only a partial overlap of the circumferential extent of the connection areas or means a deviation of ± 20 ° with regard to the circumferential extent. Compensating coupling (1) Claim 11 or 12 , characterized in that pairs of coupling elements (4a, 4b, 4c; 4d, 4e, 4f), which are arranged on both sides of a disk-shaped support body (18) designed as an intermediate support body, extend helically around a longitudinal axis. Compensating coupling (1) according to one of the preceding claims, characterized in that there is at least one hub (14, 15) which transfers a torsional moment in a frictionally locking manner to a machine part. Method for producing a compensating coupling (1) according to one of the preceding claims in an injection molding process, characterized in that the core slide (27, 28, 29), each a) both in partial circumferential areas adjacent disk-shaped support bodies (2, 3; 16, 18; 18 , 17) and b) as well as different sides of adjacent coupling elements (4a, 4b) are defined radially. Procedure according to Claim 15 , characterized in that the core slide (27, 28, 29) have two core slide parts (31, 32) which on different sides of a disk-shaped support body (18) designed as an intermediate support body, in each case both in partial circumferential areas, adjacent disk-shaped support bodies (2, 3; 16, 18; 18, 17) and also different sides of adjacent coupling elements (4a, 4b). Core slide (27, 28, 29) for producing a compensating coupling (1) according to one of the Claims 1 to 14th in an injection molding process, characterized in that the core slide (27, 28, 29) have at least one core slide part (31, 32), the outer surface of which corresponds to the contours of partial peripheral areas of adjacent disk-shaped support bodies (2, 3; 16, 18; 18, 17) as well as the contours of different sides of adjacent coupling elements (4a, 4b).

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