Assembly for spring coupling, corresponding spring coupling and method

Abstract

This assembly (10) for a spring coupling comprises a coupling housing (12) suitable for surrounding a coupling spring (14) of the spring coupling, the coupling housing defining a housing central axis (Y-Y). The assembly comprises adjustment means (16) suitable for adjusting the axial clearance between the coupling spring (14) and the coupling housing (12). Applicable to spring couplings.

Description

[0001] TITLE: Assembly for spring coupling, spring coupling and corresponding method

[0002] The present invention relates to a spring coupling assembly of the type comprising a coupling housing adapted to surround a coupling spring of the spring coupling, the coupling housing defining a central axis of the housing.

[0003] Spring couplings are known, for example, documents FR2913740A1 and FR2993027A1. These couplings comprise two coupling hubs, each equipped with teeth or coupling projections. The coupling includes a corrugated coupling spring disposed between the coupling projections.

[0004] Other types of coupling are known from documents EP2206936B1 and EP2703672A1.

[0005] General coupling properties are presented in the following works: “Flexible Couplings, their design and use; MMCalistrat; 1994” and “Couplings and Joints - Design, Selection, and Application; JR Mancuso; 1986”.

[0006] Elastomeric couplings are also known, which include elastomeric linking elements. These elastomeric linking elements transmit torque between two coupling hubs. These elastomeric couplings allow the dynamic properties of the coupling to be adjusted by changing the elastomeric element.

[0007] The aim of the present invention is to adapt a spring coupling to a given application. A particular aim of the invention is to make a spring coupling adjustable in terms of transmission properties, especially dynamic transmission properties. A further aim is to make a spring coupling adjustable using simple and / or economical means.

[0008] To this end, the invention relates to a coupling assembly, as indicated above, characterized in that the assembly includes adjustment means adapted to adjust the axial play between the coupling spring and the coupling housing.

[0009] Depending on specific embodiments of the assembly, it may include one or more of the following characteristics:

[0010] - the coupling housing includes a first front wall and the adjustment means include a first adjustment element associated with the first front wall;

[0011] - the coupling housing includes a second front wall, opposite the first front wall, and the adjustment means include a second adjustment element associated with the second front wall; - the first adjustment element includes receiving recesses, each of which is adapted to receive a first end of a coupling spring, and where applicable, the second adjustment element includes receiving recesses, each of which is adapted to receive a second end of a coupling spring;

[0012] - the adjustment means include at least a first damping element which is disposed between the first front wall and the first adjustment element and which is adapted to allow a relative displacement generating damping between the first front wall and the first adjustment element, and, where appropriate, the adjustment means include at least a second damping element which is disposed between the second front wall and the second adjustment element and which is adapted to allow a relative displacement generating damping between the second front wall and the second adjustment element;

[0013] - the first damping element includes at least one friction surface which is covered with a lubricant, and, where applicable, the second damping element includes a friction surface which is covered with a lubricant;

[0014] - the adjustment means are adapted to adjust the clearance in an adjustable manner, in particular in which the adjustment means include at least a first expansion chamber and / or a second expansion chamber adapted to be connected to a fluid source;

[0015] - the assembly includes a coupling spring, which is adapted to be disposed in the coupling housing or which is disposed in the coupling housing and the adjustment means are adapted to adjust the axial play between the coupling spring and the coupling housing.

[0016] The invention also relates to a spring coupling of the type comprising two coupling hubs, characterized in that the spring coupling comprises an assembly as defined above, and in that the coupling spring connects the two coupling hubs.

[0017] Depending on specific embodiments of the spring coupling, it may include one or more of the following characteristics:

[0018] - the two coupling hubs are identical; and

[0019] - each coupling hub comprises a base body and coupling projections, the coupling projections project from the base body and extend from the base body radially outwards relative to the central coupling axis.

[0020] The invention also relates to a method of mounting a spring coupling as defined above, characterized by the successive steps: - supplying the spring coupling;

[0021] - adjusting the clearance between the coupling spring and the coupling housing using adjustment means so that the spring coupling has nominal dynamic behavior.

[0022] The invention will be better understood upon reading the following description, given solely by way of example and made with reference to the attached drawings, in which:

[0023] [Fig 1] Figure 1 shows a spring coupling according to a first embodiment of the invention;

[0024] [Fig 2] Figure 2 schematically shows part of the spring coupling of Figure 1;

[0025] [Fig 3] Figure 3 schematically shows part of a spring coupling according to a second embodiment of the invention, the view of Figure 3 corresponding to the view of Figure 2;

[0026] [Fig 4] Figure 4 schematically shows part of a spring coupling according to a third embodiment of the invention, the view of Figure 4 corresponding to the view of Figure 2;

[0027] [Fig 5] Figure 5 schematically shows part of a spring coupling according to a fourth embodiment of the invention, the view of Figure 5 corresponding to the view of Figure 2;

[0028] [Fig 6] Figure 6 schematically shows part of a spring coupling according to a fifth embodiment of the invention, the view of Figure 6 corresponding to the view of Figure 2;

[0029] [Fig 7] Figure 7 schematically shows part of a spring coupling according to a sixth embodiment of the invention, the view in Figure 7 corresponding to the view in Figure 2; and

[0030] [Fig 8] Figure 8 schematically shows part of a spring coupling according to the prior art, the view in Figure 8 corresponding to the view in Figure 2.

[0031] Figure 1 shows in perspective and partially torn away, a spring coupling according to the invention, designated by the general reference 2.

[0032] The spring coupling 2 advantageously has a nominal transmission torque greater than 500 N.m. The spring coupling 2 advantageously has a nominal rotational speed less than 3000 rpm.

[0033] The spring coupling 2 extends about a central coupling axis XX. Unless otherwise specified, the terms "radially," "axially," and "circumferentially" will be used in what follows with respect to this central coupling axis XX. The spring coupling 2 comprises two coupling hubs 4. One of the coupling hubs 4 is a driving coupling hub, and the other of the coupling hubs 4 is a driven coupling hub.

[0034] The spring coupling 2 also includes a spring coupling assembly 10. The assembly 10 includes a coupling housing 12, a coupling spring 14, and adjustment means 16.

[0035] In the assembled state of the spring coupling 2, the coupling spring 14 connects the two coupling hubs 4 at least in rotation around the central coupling axis XX.

[0036] The adjustment means 16 are adapted to adjust the axial clearance between the coupling spring 14 and the coupling housing 12, in particular to a defined or nominal axial clearance. The adjustment means 16 adjust the axial clearance between the coupling spring 14 and the coupling housing 12.

[0037] Each coupling hub 4 comprises a base body 20 and coupling projections 22. The base body 20 is generally cylindrical and coaxial with the central coupling axis XX. The coupling projections 22 project from the base body 20 and extend radially outward from the central coupling axis XX. Each coupling projection 22 is approximately parallelepiped in shape. Each coupling projection 22 has an axial end 24, which narrows in a direction extending axially toward the adjacent coupling hub 4. Each time, two circumferentially adjacent mating projections 22 define an interstice 26 between them.

[0038] The two coupling hubs 4 are in this case identical.

[0039] In the assembled state of the spring coupling 2, the gaps 26 of the two coupling hubs 4 are circumferentially aligned with each other.

[0040] The coupling housing 12 defines a central housing axis YY, which is coaxial with respect to the central coupling axis XX. The expressions "radially", "axially" and "circumferentially" are therefore also valid with respect to this central housing axis YY.

[0041] The coupling housing 12 is free to rotate about the central coupling axis XX around the coupling hubs 4. Alternatively, the coupling housing 12 is fixed for rotation about one of the coupling hubs 4 and free to rotate about the other coupling hub 4. The coupling housing 12 comprises two coupling halves 28. The coupling housing 12 surrounds the coupling spring 14, the adjustment means 16, the coupling projections 22, and the gaps 26. In this case, the coupling housing 12 is sealed against the two base bodies 20 by means of sealing gaskets 30, one of which is visible in Figure 1. The coupling halves 28 are fastened to each other by fastening means 32, in this case bolts.

[0042] In this case, each coupling half-case 28 is annular in shape and the two coupling half-cases 28 are separated by a separating plane extending perpendicularly with respect to the central coupling axis XX. In an alternative not shown, the two coupling half-cases 28 are each semi-annular in shape and separated by a separating plane extending radially with respect to the central coupling axis XX.

[0043] The coupling housing 12 comprises a first front wall 34 and a second front wall 36, axially opposite to the first front wall 34. The first front wall 34 is associated with one of the coupling hubs 4, and the second front wall 36 is associated with the other coupling hub 4. The first front wall 34 and / or the second front wall 36 are annular and extend radially with respect to the central coupling axis XX and / or the central housing axis YY. The first front wall 34 and the second front wall 36 are fixed relative to each other in the axial direction along the central housing axis YY. The first front wall 34 and the second front wall 36 are connected to each other by a connecting wall, which is generally cylindrical with axis YY.The first front wall 34 and the second front wall 36 are axially separated from each other by a given axial wall distance.

[0044] The coupling spring 14 comprises a plurality of connecting bars 40. The coupling spring 14 also includes angled connecting portions 42. The connecting bars 40 are fixed to each other by these angled connecting portions 42. Each connecting bar 40 is straight and generally extends parallel to the central axis of the housing YY and, in the assembled state of the coupling, generally parallel to the central axis of the coupling XX. The connecting bars 40 are generally parallel to each other. The cross-section of the connecting bars 40 is, for example, rectangular or trapezoidal.

[0045] The coupling spring 14 comprises first coupling spring ends 44 and second coupling spring ends 46. These first and second coupling spring ends 44, 46 are therefore axial ends. In this case, each of the first and second coupling spring ends 44, 46 is formed by one of the angled connecting portions 42, more precisely by the axial apex of this angled connecting portion 42.

[0046] The first coupling spring ends 44 are associated with the first front wall 34 and are therefore closer to this first front wall 34 than to the second front wall 36. Similarly, the second coupling spring ends 46 are associated with the second front wall 36 and are therefore closer to this second front wall 36 than to the first front wall 34.

[0047] The coupling spring 14 is manufactured, for example, in one piece. The coupling spring 14 may also consist of several partial coupling springs. Each partial coupling spring is separate and distinct from the adjacent partial coupling spring. Each partial coupling spring comprises, for example, at least two connecting bars 40 and a bent connecting portion 42.

[0048] The coupling spring 14 is made for example of metal, in particular steel.

[0049] The spring coupling 2 further includes a lubricant 48, preferably grease, suitable for lubricating the connection between the plurality of connecting bars 40 and the coupling hubs 4. Alternatively, the lubricant 48 is oil.

[0050] As shown in Figure 2, according to this embodiment, the adjustment means 16 comprise a first adjustment element 50 associated with the first front wall 34. The first adjustment element 50 is an element axially interposed between the first front wall 34 and the coupling spring 14. The first adjustment element 50 is arranged axially at least partially between the first ends of the coupling spring 44 and the first front wall 34. The first adjustment element 50 has an axial thickness EA1 adjusted such that, in the rest state of the spring coupling 2, i.e., when the spring coupling 2 is not subjected to a rotational transmission torque, the axial clearance between the coupling spring 14 and the coupling housing 12, in this case the axial clearance between the coupling spring 14 and the first adjustment element 50, is equal to a defined clearance JD1. The axial thickness EA1 is fixed in this case.

[0051] The first adjusting element 50 is, for example, an annular plate. In this case, the first adjusting element 50 has a flat bearing surface 52 on which the coupling spring 14 can be applied or is applied.

[0052] The first adjustment element 50 can be made of materials such as steel, aluminum, or bronze. The first adjustment element 50 can be made of a material with a modulus of elasticity >50 GPa. Alternatively, the first adjustment element 50 can be made, for example, of an elastomer, a thermoplastic, or even a metal foam. The first adjustment element 50 can be made of a material with a modulus of elasticity <10 GPa.

[0053] The first adjusting element 50 is, for example, axially fixed to the first front wall 34. Thus, due to the defined clearance JD1, a relative movement is permitted between the first adjusting element 50 and the coupling spring 14.

[0054] In an alternative not shown in Figure 2, the first adjusting element 50 is axially fixed to the coupling spring 14 and is free relative to the first front wall 34. In this case, relative movement is permitted between the first adjusting element 50 and the first front wall 34. In this case, the axial clearance between the first adjusting element 50 and the first front wall 34 is equal to the clearance defined JD1.

[0055] This defined clearance JD1 advantageously corresponds to the nominal dynamic behavior of the spring coupling. In particular, this defined clearance JD1 provides the nominal dynamic behavior to the spring coupling or contributes to this nominal dynamic behavior. Specifically, the nominal dynamic behavior includes a nominal torsional stiffness and / or a nominal damping coefficient of the spring coupling.

[0056] The set value JD1 can be zero or greater than 0.

[0057] In the present case, and when this defined clearance JD1 is greater than 0, the defined clearance JD1 corresponds to the permitted axial displacement distance of the coupling spring 14 between a position axially centered with respect to the coupling hubs 4 and an axially stopped position at which the coupling spring 4 axially stresses the first front wall 34.

[0058] Alternatively, the defined clearance JD1 can also be a negative clearance, i.e., correspond to a preload of the coupling spring 14. In this case, in the rest state of the spring coupling, i.e. when the spring coupling 2 is not subjected to a rotational transmission torque, the first adjusting element 50 applies to the coupling spring 14.

[0059] As shown elsewhere in Figure 2, the adjustment means 16 include in this case a second adjustment element 60 associated with the second front wall 36. The second adjustment element 60 is an element axially interposed between the second front wall 36 and the coupling spring 14. The second adjustment element 60 is arranged axially at least partially between the second ends of the coupling spring 46 and the second front wall 36. The second adjustment element 60 has an axial thickness EA2 adjusted such that, in the rest state of the spring coupling 2, i.e. when the spring coupling 2 is not subjected to a rotational transmission torque, the axial clearance between the coupling spring 14 and the coupling housing 12, in this case the axial clearance between the coupling spring 14 and the second adjustment element 60, is equal to a defined clearance JD2. The axial thickness EA2 is fixed in this case.

[0060] The second adjusting element 60 is, for example, an annular plate. In this case, the second adjusting element 60 has a flat bearing surface 62 on which the coupling spring 14 can be applied or is applied.

[0061] The second adjustment element 60 can be made of materials such as steel, aluminum, or bronze. The second adjustment element 60 can be made of a material with a modulus of elasticity >50 GPa. Alternatively, the second adjustment element 60 can be made, for example, of elastomer, thermoplastic material, or even metal foam. The second adjustment element 60 can be made of a material with a modulus of elasticity <10 GPa.

[0062] The second adjusting element 60 is, for example, axially fixed to the second front wall 36. Thus, due to the defined clearance JD2, a relative movement is permitted between the second adjusting element 60 and the coupling spring 14.

[0063] In an alternative not shown in Figure 2, the second adjusting element 60 is axially fixed to the coupling spring 14 and is free relative to the second front wall 36. In this case, relative movement is permitted between the second adjusting element 60 and the second front wall 36. In this case, the axial clearance between the second adjusting element 60 and the second front wall 36 is equal to the clearance defined JD2.

[0064] The defined clearance JD2 advantageously corresponds to the nominal dynamic behavior of the spring coupling. In particular, this defined clearance JD2 provides the nominal dynamic behavior to the spring coupling or contributes to this nominal dynamic behavior. Specifically, the nominal dynamic behavior includes a nominal torsional stiffness and / or a nominal damping coefficient of the spring coupling.

[0065] The set JD2 can be zero or greater than 0.

[0066] In the present case, and when this defined clearance JD2 is greater than 0, the defined clearance JD2 corresponds to the permissible axial displacement distance of the coupling spring 14 between a position axially centered with respect to the coupling hubs 4 and an axially unrestricted position at which the coupling spring 14 axially loads the second front wall 36. Alternatively, the defined clearance JD2 can also be a negative clearance, i.e., correspond to a preload of the coupling spring. In this case, in the rest state of the spring coupling, i.e., when the spring coupling 2 is not subjected to a rotational transmission torque, the second adjusting element 60 is applied to the coupling spring 14.

[0067] The coupling housing 12, the coupling spring 14 and the adjustment means 16 define a global axial defined clearance JPG between the coupling spring 14 and the coupling housing 12.

[0068] The overall axial clearance (JPG) results in the nominal dynamic behavior of the spring coupling. Specifically, this overall axial clearance (JPG) provides the nominal dynamic behavior to the spring coupling or contributes to this nominal dynamic behavior. In particular, the nominal dynamic behavior includes a nominal torsional stiffness and / or a nominal damping coefficient of the coupling.

[0069] In this case, the overall axial clearance JPG is the sum of the two defined clearances JD1 and JD2. This is indicated in the figures by the bracket JPG connecting the two clearances JD1 and JD2. Alternatively, when the adjustment means 16 do not include a second adjustment element 60 and / or when the coupling spring 14 is in contact with the second front wall 36, the overall axial clearance JPG is identical to the defined clearance JD1.

[0070] In the event that the defined clearance JD1 and / or where applicable the defined clearance JD2, is / are less than 0, i.e. correspond(s) to an axial preload of the coupling spring 14, the defined clearance, respectively the global axial defined clearance JPG, is the difference between the axial length of the coupling spring 14 in the preloaded state and the axial length of the coupling spring 14 in the free state.

[0071] The defined clearance JD1 and / or the defined clearance JD2 and / or the overall axial defined clearance JPG is / are advantageously defined sufficiently small so that, when a nominal transmission torque is applied to the spring coupling 2, the first front wall 34 and / or the second front wall 36 oppose an axial displacement of the coupling spring 14.

[0072] In the variant not shown, the second adjustment element 60 can be omitted and the adjustment means 16 can in this case only include the first adjustment element 50.

[0073] Figure 3 schematically shows a portion of a spring coupling 2 according to a second embodiment of the invention, the view in Figure 3 corresponding to the view in Figure 2. Only the differences compared to the previous embodiment will be described. Analogous elements bear the same reference numerals.

[0074] The adjustment means 16 are adapted to adjust the axial play to the defined clearance JD1 and / or the defined clearance JD2. This is indicated in Figure 3 by the slanted straight arrows. The adjustment means 16 include, for example, a first adjustment element 50 with a variable axial thickness EA1. Similarly, the adjustment means 16 include, for example, a second adjustment element 60 with a variable axial thickness EA2. The axial thickness EA2 can be adjusted, for example, independently of the axial thickness EA1.

[0075] The first adjusting element 50 whose axial thickness EA1 is variable and / or the second adjusting element 60 whose axial thickness EA2 is variable can be formed by different means, for example by means comprising cams and counter-cams or by means comprising adjusting screws.

[0076] This embodiment is advantageous since it allows easy adjustment of the dynamic behavior of the spring coupling 2, without replacement of the first adjusting element 50 and / or the second adjusting element 60.

[0077] Figure 4 schematically shows a portion of a spring coupling according to a third embodiment of the invention, the view in Figure 4 corresponding to the view in Figure 2 and therefore also to that in Figure 3. Only the differences compared to the previous embodiment will be described. Analogous elements bear the same reference numerals.

[0078] In this embodiment, the adjustment means 16 are adapted to adjust the axial clearance in an adjustable manner to the defined clearance JD1 and / or the defined clearance JD2, as in the previous embodiment. In this case, the adjustment means 16 comprise at least one expansion chamber. Specifically, this at least one expansion chamber comprises a first expansion chamber 64 and / or a second expansion chamber 66. The first adjustment element 50 is provided with the first expansion chamber 64. The second adjustment element 60 is provided with the second expansion chamber 66.

[0079] At least one expansion chamber is adapted to be connected to a fluid source 68.

[0080] Introducing fluid through the fluid source 68 into the first expansion chamber 64 leads to a decrease in the axial clearance between the first adjusting element 50 and the coupling spring 14, or, if the axial clearance is negative, to an increase in the axial preload exerted by the first adjusting element 50 on the coupling spring 14. Introducing fluid through the fluid source 68 into the second expansion chamber 66 leads to a decrease in the axial clearance between the second adjusting element 60 and the coupling spring 14, or, if the axial clearance is negative, to an increase in the axial preload exerted by the second adjusting element 60 on the coupling spring 14.

[0081] Similarly, a fluid withdrawal from the first expansion chamber 64 leads to an increase in axial clearance between the first adjusting element 50 and the coupling spring 14, and, where applicable, to a decrease in the axial preload exerted by the first adjusting element 50 on the coupling spring 14. A fluid withdrawal from the second expansion chamber 66 leads to an increase in axial clearance between the second adjusting element 60 and the coupling spring 14, and, where applicable, to a decrease in the axial preload exerted by the second adjusting element 60 on the coupling spring 14.

[0082] During operation, fluid is introduced through the fluid source 68 into the first expansion chamber 64 and / or the second expansion chamber 66 until the axial clearance equals the defined clearance JD1 and / or the defined clearance JD2. Alternatively, during operation, fluid is withdrawn from the first expansion chamber 64 and / or the second expansion chamber 66 until the axial clearance equals the defined clearance JD1 and / or the defined clearance JD2.

[0083] The fluid in the first expansion chamber 64 and / or in the second expansion chamber 66 is, for example, grease or oil. Alternatively, this fluid is silicone.

[0084] Figure 5 schematically shows a portion of a spring coupling according to a fourth embodiment of the invention, the view in Figure 5 corresponding to the view in Figure 2. Only the differences compared to the previous embodiment will be described. Analogous elements bear the same reference numerals.

[0085] The adjustment means 16 include the first adjustment element 50. The first adjustment element 50 is fixed to the coupling spring 14, at least circumferentially. Relative movement is permitted between the first adjustment element 50 and the first front wall 34. The axial clearance between the first adjustment element 50 and the first front wall 34 is equal to the defined clearance JD1. In this case, the surface of the first adjustment element 50 facing the first front wall 34 can be a friction surface 78, similar to the lubricant-coated friction surface 78 (not shown) of the embodiment in Figure 6 (see below). In the illustrated case, the defined clearance JD1 is essentially zero, possibly excepting for a distance corresponding to the thickness of a lubricant layer. The lubricant layer can, for example, have a thickness between 5 µm and 50 µm.In this case, the first adjustment element 50 has a bearing surface 52 provided with receiving recesses 70. Each receiving recess 70 of the bearing surface 52 receives a first end of coupling spring 44. The receiving recess 70 holds the first end of coupling spring 44 in the circumferential direction essentially without play.

[0086] The adjustment means 16 include the second adjustment element 60. The second adjustment element 60 is fixed to the coupling spring 14, at least circumferentially. Relative movement is permitted between the second adjustment element 60 and the second front wall 36. The axial clearance between the second adjustment element 60 and the second front wall 36 is equal to the clearance defined JD2. In this case, the surface of the second adjustment element 60 facing the second front wall 36 can be a friction surface 82, similar to the lubricant-coated friction surface 82 (not shown) of the embodiment in Figure 6. In the illustrated case, the clearance defined JD2 is essentially zero, possibly excepting for a distance corresponding to the thickness of a layer of the lubricant. The lubricant layer can, for example, have a thickness between 5 µm and 50 µm.

[0087] In this case, the second adjustment element 60 has a bearing surface 62 also provided with receiving recesses 70. Each receiving recess 70 of the bearing surface 62 receives a second end of coupling spring 46. The receiving recess 70 holds the second end of coupling spring 46 in the circumferential direction essentially without play.

[0088] Each receiving recess 70 and the associated first or second coupling spring end 44, 46 have complementary shapes. In this case, each receiving recess 70 has a circular arc profile and the associated first or second coupling spring end 44, 46 has a corresponding circular arc profile.

[0089] The receiving recesses 70 are axially open towards the coupling spring 14.

[0090] Adjusting the shapes of the receiving recesses 70 and the associated first or second ends of the coupling springs 44, 46 can advantageously contribute to the nominal dynamic behavior of the spring coupling. In particular, adjusting the aforementioned shapes can contribute to the nominal torsional stiffness and / or the nominal damping coefficient of the spring coupling.

[0091] In an alternative not shown, the first adjusting element 50 is fixed circumferentially to the coupling spring 14 by means other than by the receiving recesses 70. In an alternative not shown, the second adjusting element 60 is fixed circumferentially to the coupling spring 14 by means other than by the receiving recesses 70.

[0092] In an alternative not shown, as in the case of the embodiment in Figure 2, the second adjustment element 60 can be omitted and the adjustment means 16 can in this case only include the first adjustment element 50.

[0093] Figure 6 schematically shows a portion of a spring coupling according to a fifth embodiment of the invention, the view in Figure 6 corresponding to the view in Figure 2 and therefore also to that in Figure 5. Only the differences compared to the previous embodiment will be described. Analogous elements bear the same reference numerals.

[0094] The adjustment means 16 include a first damping element 74, which is disposed between the first front wall 34 and the first adjustment element 50 and which is adapted to allow a relative displacement generating damping between the first front wall 34 and the first adjustment element 50. This damping produced by the relative displacement between the parts is a combination of Coulomb friction between the surfaces of the parts and viscous friction produced by the displacement of the lubricant in this area.

[0095] Furthermore, the adjustment means 16 include a second damping element 76 which is disposed between the second front wall 36 and the second adjustment element 60 and which is adapted to allow a relative displacement generating damping between the second front wall 36 and the second adjustment element 60. This damping produced by the relative displacement between the parts is a combination of Coulomb friction between the surfaces of the parts and viscous friction produced by the displacement of the lubricant in this area.

[0096] The first damping element 74 and / or the second damping element 76 comprise, for example, one or more sliding or friction rings. The nature of the materials, the surface texture, and the shapes of the first and second damping elements 74 and 76 determine the defined damping coefficient of the coupling.

[0097] For this purpose, the first damping element 74 includes a friction surface 78 which is coated with a lubricant 80. Similarly, the second damping element 76 includes a friction surface 82 which is coated with a lubricant 84. The axial extent of the lubricants 80 and 84 is exaggerated in Figure 6. The axial extent of the lubricant 80 corresponds to the defined clearance JD1 and / or the axial extent of the lubricant 84 corresponds to the defined clearance JD2. Alternatively, the location of the lubricant 80 and / or the lubricant 84 may differ from the location described above and shown in Figure 6. For example, the lubricant 80 may be located between the first damping element 74 and the first adjustment element 50 and / or the lubricant 84 may be located between the second damping element 76 and the second adjustment element 60.

[0098] In an alternative not shown, in a manner analogous to the previous embodiments, the second adjustment element 60 may be omitted and / or the second damping element 74 and the adjustment means 16 may in this case only include the first adjustment element 50.

[0099] Figure 7 schematically shows a portion of a spring coupling according to a sixth embodiment of the invention, the view in Figure 7 corresponding to the view in Figure 2 and that in Figure 6. Only the differences compared to the preceding embodiment will be described. Analogous elements bear the same reference numerals.

[0100] The adjustment means 16 of this embodiment further include the first expansion chamber 64 and / or the second expansion chamber 66, in a manner analogous to the embodiment of Figure 4. The adjustment means 16 include for this purpose a first expansion member which is provided with the first expansion chamber 64 and which is disposed between the first damping element 74 and the first front wall 34. The adjustment means 16 include for this purpose a second expansion member which is provided with the second expansion chamber 66 and which is disposed between the second damping element 76 and the second front wall 36.

[0101] The defined clearance JD1 and / or the defined clearance JD2 is, for example, between 0 and 1.00 mm or between 0 and 0.50 mm. In the case of preload, the defined clearance JD1 and / or the defined clearance JD2 is, for example, between 0 (exclusive) and -1.00 mm or between 0 (exclusive) and -0.50 mm. Consequently, the overall axial defined clearance JPG is, for example, between 1.00 mm and -0.50 mm.

[0102] The spring coupling 2 according to the invention is assembled according to an assembly method comprising the following successive steps. The spring coupling 2 is supplied. Then, the axial clearance between the coupling spring 14 and the coupling housing 12 is adjusted by means of the adjustment means 16. In particular, this axial clearance is adjusted to the defined overall axial clearance JPG, such that the spring coupling has nominal dynamic behavior or such that this axial clearance contributes to this nominal dynamic behavior.

[0103] The variant technical features disclosed in connection with one embodiment may also be applied to other disclosed embodiments. The axial clearance between the coupling spring 14 and the coupling housing 12 is adjusted by means of the adjustment means 16 to obtain a nominal torsional stiffness and / or a nominal damping coefficient for the spring coupling 2. In particular, the spring coupling 2 has a defined clearance JD1 and / or JD2 for a nominal torsional stiffness and / or a nominal damping coefficient, and the axial clearance is adjusted by means of the adjustment means 16 so that the clearance is equal to the defined clearance JD1 and / or the defined clearance JD2.

[0104] Other general features of the invention include:

[0105] The first adjustment element 50 and / or the second adjustment element 60 is / are made of solid material.

[0106] The first adjustment element 50 and the second adjustment element 60 are distinct from the first front wall 34 and the second front wall 36 to which this adjustment element is associated.

[0107] The defined clearance JD1 and / or the defined clearance JD2 is / are dimensioned such that the first front wall 34 and / or the second front wall 36 act as axial stops for the coupling spring 14, particularly during operation of the spring coupling. Thus, the first front wall 34 and / or the second front wall 36 resist axial displacement of the coupling spring 14 under the effect of a transmission torque.

[0108] The spring coupling 2 according to the invention provides the following advantages or characteristics:

[0109] The torsional natural mode of the spring coupling 2 is adjustable so that it is located outside a torsional natural mode of a shaft line in which the spring coupling 2 is located.

[0110] The stiffness of the spring coupling 2 is adjustable to a given stiffness that lies outside a given torsional natural mode. This allows operation at a given speed, such as a given rotational speed and / or power.

[0111] The stiffness of the spring coupling 2 can be controlled during operation to deviate from torsional natural modes. This allows operation at various given speeds, such as rotational speeds and power levels.

[0112] Vibration amplification is limited, particularly when resonant phenomena occur, thanks to damping.

[0113] The damping is adjustable to limit energy amplification and dissipation, thus optimizing the energy efficiency of the spring coupling 2. Unstable and non-steady operation of the drive train in which the spring coupling 2 is inserted can be limited. Mechanical stresses in the drive train in which the spring coupling 2 is inserted during torsional shock can be limited and reduced.

[0114] A range of spring couplings can be designed, with each size of spring coupling covering a wide range of stiffness and damping.

[0115] Spring couplings can have torsional properties that are specifically tailored to a given application.

[0116] The preceding description contains technical features of the invention. These technical features, although presented in a technical context and possibly in combination with other technical features, can each time be used individually, without the other technical features, insofar as this is technically possible.

[0117] Figure 8 schematically shows a portion of a spring coupling according to the prior art, the view in Figure 8 corresponding to the view in Figure 2. Elements analogous to the elements of the invention bear the same reference numerals, increased by 100. The spring coupling 102 comprises coupling projections 122, a first front wall 134, and a second front wall 136. The spring coupling 102 also comprises a coupling spring with connecting bars 140 linked by angled connecting portions 142.

[0118] Between the angled connecting portions 142 and the first front wall 134 and the second front wall 136, respectively, there remains an undefined axial gap END, which is significant and undefined. Here, the first front wall 134 and the second front wall 136 do not contribute significantly to the dynamic behavior of the spring coupling.

Claims

DEMANDS 1. Assembly (10) for spring coupling, of the type comprising - a coupling housing (12) adapted to surround a coupling spring (14) of the spring coupling, the coupling housing defining a central housing axis (YY), characterized in that the assembly includes adjustment means (16) adapted to adjust the axial clearance between the coupling spring (14) and the coupling housing (12).

2. Assembly according to claim 1, wherein the coupling housing (12) comprises a first front wall (34) and wherein the adjustment means (16) comprise a first adjustment element (50) associated with the first front wall (34).

3. Assembly according to claim 2, wherein the coupling housing comprises a second front wall (36), opposed to the first front wall (34), and wherein the adjustment means comprise a second adjustment element (60) associated with the second front wall (36).

4. Assembly according to any one of claims 2 or 3, wherein the first adjusting element (50) comprises receiving recesses (70), each of which is adapted to receive a first coupling spring end (44), and where applicable, wherein the second adjusting element (60) comprises receiving recesses (70), each of which is adapted to receive a second coupling spring end (46).

5. Assembly according to any one of claims 2 to 4, wherein the adjustment means (16) comprise at least a first damping element (74) which is disposed between the first front wall (34) and the first adjustment element (50) and which is adapted to permit a relative displacement generating damping between the first front wall (34) and the first adjustment element (50), and, where applicable, wherein the adjustment means comprise at least a second damping element (76) which is disposed between the second front wall (36) and the second adjustment element (60) and which is adapted to permit a relative displacement generating damping between the second front wall and the second adjustment element.

6. Assembly according to claim 5, wherein the first damping element (74) comprises at least one friction surface (78) which is covered of a lubricant (80), and, where appropriate, wherein the second damping element (76) comprises a friction surface (82) which is covered with a lubricant (84).

7. Assembly according to any one of the preceding claims, wherein the adjustment means (16) are adapted to adjust the clearance in an adjustable manner, in particular wherein the adjustment means comprise at least a first expansion chamber (64) and / or a second expansion chamber (66) adapted to be connected to a fluid source (68).

8. Assembly according to any one of the preceding claims, wherein the assembly (2) comprises a coupling spring (14), which is adapted to be disposed in the coupling housing (12), or which is disposed in the coupling housing (12), and wherein the adjustment means (16) are adapted to adjust the axial clearance between the coupling spring (14) and the coupling housing (12).

9. Spring coupling (2), of the type comprising two coupling hubs (4), characterized in that the spring coupling comprises an assembly according to claim 8, and in that the coupling spring (14) connects the two coupling hubs.

10. Spring coupling (2) according to claim 9, wherein the two coupling hubs (4) are identical.

11. Method for mounting a spring coupling according to claim 9 or 10, characterized by the successive steps: - supply of the spring coupling (2); - adjusting the clearance between the coupling spring (14) and the coupling housing (12) by means of the adjustment means (16) so that the spring coupling has nominal dynamic behavior.

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