Multi-stage vibration damping device with mechanical stopper

Abstract

A multi-stage vibration damping device having a mechanical stopper is disclosed. The present invention provides a vibration damping device comprising: a first damping unit having a first input member, a first output member, and a first spring; and a second damping unit having a second input member, a second output member, and a second spring, the second damping unit being disposed axially outwardly of the first damping unit; a rotor unit having a rotor sleeve; and a mechanical stopper configured to limit the relative rotation between the first input member and the first output member or the second input member within a predetermined range.

Description

TECHNICAL FIELD

[0001] The present invention relates to a vibration damping device for vehicles, in particular for hybrid vehicles, and more particularly to a multi-stage vibration damping device having a mechanical stopper. BACKGROUND

[0002] A power transmission device for hybrid vehicles is known in which a motor is installed inside a transmission and a vibration damping device is arranged radially inside the motor. A torsional damper, also called a torsional vibration damper, can connect two or more dampers in series to improve the vibration absorption performance of the motor. The torsional damper can be located inside the transmission and use transmission oil as a lubricant.

[0003] Korean Patent No. 10-2238845 entitled “Power transmission device for hybrid vehicles” discloses how Fig. 1 shows a power transmission device 1 arranged between an engine 2, located on the right side of the drawing, and a transmission 3, located on the left side of the drawing. The power transmission device 1 includes a torsional damper 40, and the torsional damper 40 includes two damper units 41 and 42. Referring to the enlarged view at the bottom of Fig. 1, a rotor sleeve P11 is coupled to a rotor P10 arranged on the side of the motor 2, and a driven plate P40 is arranged on the side of the gearbox 3.

[0004] A primary torsional damper 42 includes a cover plate P20 and a spring P21, and a driven plate P23 is positioned inside it. The cover plate P20 of the primary torsional damper 42 is welded to the rotor sleeve P11 at a fixed portion P25. A secondary torsional damper 41 includes a front cover plate P30 and a spring P31. Within the secondary torsional damper, hysteresis control elements P35a and P35b, such as friction discs or elastic discs, are arranged on both sides of the driven plate P40. Hysteresis refers to an elastic hysteresis phenomenon.

[0005] In the torsional damper configuration described above, components forming the primary and / or secondary torsional damper may move axially or radially, particularly during idle operation, often resulting in rattling noises referred to as idle noise. The hysteresis control element P35 is provided to suppress such idle noise.

[0006] In the conventional technology described above, it is difficult to effectively suppress idle noise of the primary torsion damper 42 because the hysteresis control element P35 is provided only on the secondary torsion damper 41 side.

[0007] To reliably suppress idle noise from the vibration damping device, hysteresis control elements must be arranged at the required positions. However, it is relatively difficult to additionally arrange such elements because other components of the hybrid vehicle's vibration damping device are already densely arranged in a limited space.

[0008] Furthermore, in the conventional configuration, the fixed portion P25 is disposed between the cover plate P20 of the primary torsional damper 42 and the rotor sleeve P11 radially inward from the center of the torsional damper 40, in other words, radially inside the spring P21 of the primary torsional damper. When the torsional damper 40 rotates, its components tend to move radially outward due to centrifugal force. Because the fixed portion P25 is disposed radially inward, it does not effectively restrain such outward movement tendencies, making it difficult to effectively suppress the overall idle noise of the torsional damper 40. SUMMARY OF THE INVENTION TASK TO BE SOLVED

[0009] The present invention aims to provide a multi-stage vibration damping device that can eliminate axial and radial movements of the damper and resulting abnormal spring behavior.

[0010] The present invention also aims to provide a multi-stage vibration damping device that can prevent breakage of the spring due to abnormal torque of the engine.

[0011] The present invention also aims to provide a multi-stage vibration damping device that can prevent axial and / or radial movements of the damper and / or the breakage of the spring while maintaining the compactness of a conventional damper.

[0012] The problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description. SOLUTION TO THE PROBLEM

[0013] To achieve the above-described objects, a vibration damping device according to the present invention includes the following aspects and any combinations thereof.

[0014] According to one aspect of the present invention, a vibration damping device comprises: a first damping unit having a first input member, a first output member, and a first spring; a second damping unit having a second input member, a second output member, and a second spring, the second damping unit being arranged axially outside the first damping unit; a rotor unit having a rotor sleeve; and a mechanical stopper configured to limit the relative rotation between the first input member and the first output member or the second input member within a predetermined range.

[0015] According to another aspect of the present invention, the first input member has a central hole, wherein the mechanical stopper has a first protrusion protruding radially inward from the first input member toward the central hole and a second protrusion protruding axially inward from the second input member toward the first input member, and wherein the first protrusion and the second protrusion are configured to interfere with each other when the first input member or the second input member rotates.

[0016] According to another aspect of the present invention, the mechanical stopper includes a first protrusion protruding axially inward from the first input member toward the first output member, and the first protrusion and the first output member are configured to interfere with each other when the first input member or the first output member rotates.

[0017] According to another aspect of the present invention, the vibration damping device further comprises a hysteresis control device arranged rearward in the axial direction of the first output member, wherein the hysteresis control device has a circumferential groove so that it does not interfere with the second projection.

[0018] According to another aspect of the present invention, the vibration damping device further comprises hysteresis control means arranged forward and / or backward in the axial direction of the first output element.

[0019] According to another aspect of the present invention, at least one of the hysteresis control means has a groove into which the first projection can be inserted.

[0020] According to another aspect of the present invention, a second projection is formed which projects axially forward and / or rearward from the first output member, and at least one of the hysteresis control means has a groove into which the second projection can be inserted.

[0021] According to another aspect of the present invention, the first input member is a cover plate and the second input member is a front cover plate.

[0022] According to another aspect of the present invention, the first and second output members are each driven plates.

[0023] According to another aspect of the present invention, the first output member and the second input member are coupled to be fixed to each other in a rotational direction.

[0024] According to another aspect of the present invention, the first input member is attached to the rotor sleeve radially outward of the first spring.

[0025] According to another aspect of the present invention, the first spring comprises an outer spring and an inner spring inserted inside the outer spring, and the first input member is coupled to the rotor sleeve radially outwardly of either the outer spring or the inner spring of the first spring.

[0026] According to another aspect of the present invention, the first input member is attached to the rotor sleeve radially outwardly of a center of the first spring.

[0027] According to another aspect of the present invention, the vibration damping device further comprises hysteresis control means arranged forward and / or backward in the axial direction of the first output element.

[0028] According to another aspect of the present invention, the vibration damping device further comprises hysteresis control means arranged forward and / or backward in the axial direction of the second output element.

[0029] According to another aspect of the present invention, the hysteresis control means comprises at least one selected from the group consisting of a friction disk, a metal disk, and an elastic disk. EFFECTS OF THE INVENTION

[0030] According to the present invention, the idling noise of the multi-stage vibration damping device can be more effectively suppressed while maintaining a compact structure.

[0031] According to the present invention, spring breakage due to abnormal behavior of the motor can be prevented while maintaining a compact structure.

[0032] The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will become clear to those skilled in the art from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The following description will be better understood when read in conjunction with the accompanying drawings. Components designated by the same reference numerals in different drawings have similar functions and will not be described repeatedly unless necessary for understanding the invention. Known components may be briefly described or omitted, but should not be construed as excluding them from the embodiments of the present invention. Fig. 1 is a schematic view of a power transmission device for a hybrid vehicle with a vibration damping device according to the prior art of the present invention. Fig. 2 is a perspective view of a vibration damping device according to an embodiment of the present invention. Fig. 3 is a rear view of a vibration damping device according to an embodiment of the present invention. Fig. 4 is a perspective view of a cover plate according to an embodiment of the present invention. Fig. 5 is a perspective view of a front cover plate according to an embodiment of the present invention. Fig. 6 shows a state in which the cover plate of Fig. 4 and the front cover plate of Fig. 5 overlap. Fig. 7 is a perspective view of a driven plate according to an embodiment of the present invention. Fig. 8 is a perspective view of another driven plate according to an embodiment of the present invention. Fig. 9 is a perspective view of a friction disk and a metal disk according to an embodiment of the present invention. Fig. 10 is a perspective view of an elastic disk according to an embodiment of the present invention. Fig. 11A is a perspective view of another friction disk according to an embodiment of the present invention. Fig. 11B is a perspective cross-sectional view of the Fig. 11A shown friction disc. Fig. 12 is a perspective view of yet another friction disk according to an embodiment of the present invention. Fig. 13 is a half-sectional view of a vibration damping device according to an embodiment of the present invention. Fig. 14 is a partially enlarged perspective view of Fig. 13. Fig. 15 is a conceptual diagram regarding the arrangement state of the spring, the hysteresis control means and the mechanical stopper according to the present invention. Fig. 16A is a schematic diagram showing the arrangement state of the spring, the hysteresis control means, and the mechanical stopper according to an embodiment of the present invention. Fig. 16B is a schematic diagram showing the arrangement state of the spring, the hysteresis control means, and the mechanical stopper according to another embodiment of the present invention. Fig. 17 is a schematic diagram showing the arrangement state of the spring, the hysteresis control means, and the mechanical stopper according to still another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0034] The present invention is not limited to the embodiments disclosed below, but may be variously modified and implemented in different forms. The embodiments are intended only to complete the disclosure of the present invention and to fully convey the scope of the invention to those skilled in the art. Accordingly, the present invention is not limited to the embodiments disclosed below, and substitutions or additions between the configurations of one embodiment and another are possible. It is also to be understood that all modifications, equivalents, and alternatives included within the spirit and scope of the present invention are included.

[0035] The accompanying drawings are intended only to provide a better understanding of the embodiments disclosed in this specification, and the technical concept disclosed herein is not limited by the accompanying drawings. It is to be understood that all modifications, equivalents, and alternatives included within the spirit and scope of the present invention are included. In the drawings, components may be illustrated larger or smaller in size or thickness for clarity; however, the scope of the present invention should not be construed narrowly based on such illustration.

[0036] The terms used in this specification are for the purpose of describing particular embodiments only and are not intended to be limiting of the present invention. The singular terms include the plural terms unless the context clearly dictates otherwise. The terms such as "comprising" and "including" used in the specification are intended to specify that the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification are present. That is, the terms such as "comprising" and "including" should be understood not to preclude the presence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0037] Terms containing ordinal numbers, such as first and second, may be used to describe different components, but are not limited by such terms. The terms are used only to distinguish one component from another.

[0038] When a component is described as being "connected" or "coupled" to another component, it is understood that it may be directly connected or coupled to the other component, or it may be indirectly connected or coupled through another component. Conversely, when a component is described as being "directly connected" or "directly coupled" to another component, it is understood that there are no other components between them.

[0039] When a component is referred to as being “on” or “above” or “below” or “beneath” another component, it is understood that it is not only positioned immediately on or below the other component, but that other components may also be positioned therebetween.

[0040] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by those skilled in the art to which this invention relates. Terms defined in commonly used dictionaries should be interpreted to have meanings consistent with the context of the technology in question, and unless explicitly defined in this specification, they should not be interpreted in an idealized or overly formal sense.

[0041] Since the assembly of the embodiment is arranged symmetrically about an axis, for the convenience of the drawing, only one half along the axis may be shown. Also, for the convenience of description, a direction along the length of the axis, which is the center of rotation of the assembly, is referred to as the axial direction. In other words, the forward / backward direction or axial direction means a direction parallel to the axis of rotation. The forward direction refers to a direction toward a power source, for example, a vehicle drive motor, and the backward direction refers to the other direction, for example, toward a transmission. Accordingly, the front surface refers to a surface facing forward, and the rear surface refers to a surface facing backward.

[0042] The radial direction is the direction that approaches or moves away from the center of the rotation axis along a straight line passing through the center on a plane perpendicular to the rotation axis. The direction that moves radially outward from the center is called the centrifugal direction, and the direction that moves toward the center is called the centripetal direction.

[0043] The circumferential direction is a direction surrounding the rotation axis. The outer circumference refers to the outer periphery, and the inner circumference refers to the inner periphery. Accordingly, the outer circumferential surface is a surface facing away from the rotation axis, and the inner circumferential surface is a surface facing toward the rotation axis. The circumferential side surface is a surface whose normal points in the circumferential direction.

[0044] In the present invention, axially inward means a position closer to the engine side in the axial direction, and axially outward means a position farther from the engine side in the axial direction.

[0045] In the following, the present invention will be described in detail with reference to the accompanying drawings.

[0046] First, with reference to Fig. 2, according to one embodiment of the present invention, a vibration damping device 1 is shown, which comprises a rotor shaft 10, a rotor sleeve 11, cover plates 20 and 40, and the like. In the present invention, the vibration damping device may also be referred to as a rotor and damper assembly. The term "multi-stage" vibration damping device means that two or more dampers are connected in series, and in the illustrated embodiment, a vibration damping device with two dampers is exemplified. Hereinafter, the axially inner damper is referred to as the first damper, and the axially outer damper is referred to as the second damper.

[0047] The vibration damping device according to the present invention is preferably used for installation radially inside an engine inside a hybrid vehicle transmission.

[0048] With reference to Fig. 3, which shows a rear view of Fig. 2, a fixed portion 15, for example, a welded portion, is shown between the rotor sleeve 11 and the cover plate 20. A rear cover plate 60 has coupling holes 61 and disc holes 62. Rivets 18 are inserted into the coupling holes 61 to couple the rear cover plate 60 and the front cover plate 40 (see Fig. 13). An outer spring 65a and an inner spring 65b are housed inside the rear cover plate 60. A total of four sets of springs 65a and 65b are arranged in the circumferential direction. A driven plate 50 is arranged inside the second damper. Rivets 17 couple a driven plate 30, which is arranged in the first damper, and the front cover plate 40 of the second damper (see Fig. 13). Through such a rivet coupling, the two elements are secured not only in the axial direction but also in the rotational direction, so that they always rotate together.

[0049] Fig. Figure 4 shows the cover plate 20 according to an embodiment of the present invention. This plate, together with the driven plate 30 and the springs 37a and 37b described later, forms the first damper and serves as the input element of the first damper. That is, it is attached to the rotor sleeve and serves to transmit the driving force from the motor.

[0050] The cover plate 20 is generally annular and has a central hole 21 for inserting the rotor shaft 10 and the like, a spring receiving space 22, and disc holes 24. Engagement projections 74 of a friction disc 73 described later are fitted into the disc holes 24 (see Fig. 11A).

[0051] The cover plate 20 may have drivers 23 that project radially inward toward the central hole 21. In this example, a total of four radial drivers 23 are provided.

[0052] Fig. Figure 5 shows the front cover plate 40 according to an embodiment of the present invention. This plate, together with the driven plate 50, the rear cover plate 60, and the springs 65a and 65b described later, forms the second damper and serves as the input element of the second damper. That is, it is coupled to the driven plate 30, which is the output element of the first damper, and serves to transmit the driving force.

[0053] The front cover plate 40 has a central hole 41 for inserting the rotor shaft 10 and the like, a spring receiving space 42, coupling holes 44, and oil flow holes 45. The coupling holes 44 are holes formed for rivet coupling with the later-described driven plate 30 inward near the central bore 41. The oil flow holes 45 are holes formed radially outward of the coupling holes 44 for the flow of lubricating oil, such as automatic transmission fluid (ATF).

[0054] The front cover plate 40 may have drivers 43 that protrude in the axial direction. In this example, a total of four axial drivers 43 are provided.

[0055] Fig. 6 shows the Fig. 4 shown cover plate 20 and the one in Fig. 5 in an overlapped state corresponding to the assembly configuration. The two elements are rotatable relative to each other. As can be seen from the illustration, the radial drivers 23 and the axial drivers 43 are configured to collide with each other when one of the two elements rotates. This collision phenomenon is referred to as "interference."

[0056] The cover plate 20, which is the input element of the first damper, transmits power to the driven plate 30 and the front cover plate 40 coupled thereto via the springs 37a and 37b. When excessive torque is generated by the engine, the springs 37a and 37b may be overcompressed and broken. The configuration in which the radial followers 23 and the axial followers 43 interfere with each other limits the relative rotation between the cover plate 20 and the front cover plate 40 within a predetermined range. In other words, overrotation of the input element, the cover plate 20, is prevented, and overcompression of the springs 37a and 37b can be prevented.

[0057] Fig. Figure 7 shows the driven plate 30 of the first damper according to an embodiment of the present invention. The driven plate 30 has a central hole 31 formed at its center, coupling holes 32 into which coupling elements such as rivets can be inserted, and oil flow holes 33 for the flow of lubricating oil such as automatic transmission fluid (ATF). The row of holes formed closer to the center of the driven plate 30 are the coupling holes 32, and the row of holes formed farther away are the oil flow holes 33. The central hole 31 is a hole into which the rotor shaft 10 is inserted. The driven plate 30 functions as the output element of the first damper and receives power from the springs via a leaf portion 35.

[0058] Fig. Figure 8 shows the driven plate 50, which functions as the output element of the second damper according to an embodiment of the present invention. The driven plate 50 has a central hole 51 with a key portion 55 and through holes 52. The through holes 52 can serve as passages for inserting rivets 17 to rivet the driven plate 30 and the front cover plate 40 when the second damper is assembled. The driven plate 50 also has blades 53.

[0059] Fig. 9 and Fig. 10 shows friction discs 70, metal discs 76, and elastic discs 77, which are hysteresis control elements according to an embodiment of the present invention. The friction disc 70 is provided with oil flow grooves 71.

[0060] Fig. 11A and Fig. 11B show another friction disk 73 according to an embodiment of the present invention. The friction disk 73 has an engagement projection 74 that is fitted into the disk hole 24 of the cover plate 20. The friction disk 73 may have a circumferential groove so that it does not interfere with the axial drivers 43. Accordingly, the upper cross section 75 may have a " "-shape.

[0061] Fig. Figure 12 shows yet another friction disk 78 according to an embodiment of the present invention. The friction disk 78 has an engagement projection 79 that fits into the disk hole 62 of the rear cover plate 60.

[0062] Fig. 13 shows a half-sectional view of a vibration damping device according to an embodiment of the present invention. First, the left side of Fig. 13 is the motor side, and the right side is the transmission side. The rotor consists of a rotor shaft 10 and a rotor sleeve 11, and to the right of it is a first damper comprising the driven plate 30, the outer spring 37a, the inner spring 37b, and the cover plate 20. A total of four sets of springs 37a and 37b can be arranged in the circumferential direction. To the right of it is a second damper comprising the front cover plate 40, the outer spring 65a, the inner spring 65b, the driven plate 50, and the rear cover plate 60. The driven plate 30 and the front cover plate 40 are coupled to each other by rivets 17. A bushing 13 is also provided on the sliding surface of the rotor shaft 10.

[0063] A fixed portion 16 is formed between the rotor shaft 10 and the rotor sleeve 11, and a fixed portion 15 is formed between the rotor sleeve 11 and the cover plate 20. The fixed portions 15 and 16 may be welded portions.

[0064] The friction disc 70, the metal disc 76, and the elastic disc 77 are arranged on the left side, i.e., the forward side, of the driven plate 30. Since the friction disc 70 is pressed toward the inner wall of the rotor sleeve 11 by the elastic disc 77, it can rotate together with the rotor sleeve 11 when the rotor sleeve 11 rotates.

[0065] The friction disc 73 is arranged on the right side, i.e., the rear side, of the driven plate 30. Since the engagement projection 74 of the friction disc 73 is fitted into the cover plate 20, it can rotate together with the cover plate 20.

[0066] Similarly, the friction disk 78 is arranged on the right side, that is, the rear side, of the driven plate 50, and is coupled to the rear cover plate 60 through the engagement projection 79 so that it rotates together with the rear cover plate 60.

[0067] As described above, in the vibration damping device according to the present invention, hysteresis control means may be provided not only on the second damper side but also on the first damper side, so that axial movement of the components constituting the first damper can be suppressed.

[0068] The radially outward positioning of the fixed portion 15 is advantageous for hysteresis control, i.e., the suppression of idle noise, because it firmly restrains the radial outward movement of the vibration damping device. By forming the fixed portion 15 radially outward from the components that make up the vibration damping device, the tendency of the components to move outward due to centrifugal force can be effectively restricted. In particular, it is preferred that the fixed portion 15 be arranged radially outward from the springs 37a and 37b of the first damper.

[0069] Furthermore, the positioning of the fixed portion 15 axially outside the springs 37a and 37b of the first damper, ie between the first damper and the second damper, may also be advantageous for the hysteresis control.

[0070] The springs of the first damper may have a double spring structure including the outer spring 37a and the inner spring 37b inserted therein. The center 38 of the springs is the same for the outer spring 37a and the inner spring 37b.

[0071] When the rotor rotates under the drive of the motor, the cover plate 20 attached to the rotor sleeve 11 rotates, and the vibrations are primarily damped by the springs 37a and 37b of the first damper. When the vibration amplitude exceeds the elastic force of the first damper, the driven plate 30 rotates, and since the front cover plate 40 of the second damper, which is attached to the driven plate 30, also rotates, secondary damping is provided by the springs 65a and 65b of the second damper.

[0072] With reference to Fig. 14, the cross section 75 of the friction disc 73, which is arranged on the right side of the driven plate 30, has a “ "-shape to avoid interference with the axial drivers 43.

[0073] As described above, the inventors of the present invention have discovered that idle noise can be effectively suppressed by forming the fixed point between the vibration damping unit having a plurality of torsion dampers and the rotor sleeve radially or axially outside the springs of the first damper and providing hysteresis control elements in front of and / or behind the output element of the first torsion damper.

[0074] Fig. 15 to 17 schematically show arrangement states of the springs, the hysteresis control means and the mechanical stoppers according to embodiments of the present invention.

[0075] Fig. 15(a) shows the arrangement state of the springs, the hysteresis elements and the mechanical stopper in the Fig. 13. It corresponds to the circle and rectangles shown in Fig. 13 are shown by dotted lines. Compared to this arrangement, as shown in (b), if the three elements are arranged in a row in the radial direction, a more compact configuration in the axial direction can be achieved. The axial space secured in this way can increase design flexibility.

[0076] With reference to Fig. 16A and Fig. 16B, instead of the cams 43 extending axially from the front cover plate of the second damper, cams (mechanical stoppers) are provided that project axially inward from the cover plate of the first damper. The mechanical stopper interferes with the driven plate (e.g., its blade), preventing over-rotation of the cover plate of the first damper, thereby preventing over-compression of the springs.

[0077] The friction discs on the left and right sides of the driven plate are provided with drive grooves into which mechanical stoppers are inserted, and are coupled to the mechanical stoppers. They can therefore rotate together. The elastic disc can be axially mounted outside ( Fig. 16A) or axially within ( Fig. 16B) of the right friction disc. In this way, the springs, the hysteresis elements, and the mechanical stopper can be arranged in a radial row.

[0078] In Fig. 17 is similar to Fig. 16A and Fig. 16B, a mechanical stopper is provided that protrudes axially inward from the cover plate of the first damper, but both friction discs are provided with cam grooves that engage with cams that protrude from the driven plate, allowing the friction discs and the driven plate to rotate together. The elastic disc is arranged radially inward of the right friction disc. This is also a configuration in which the springs, hysteresis elements, and mechanical stopper are arranged in a row in the radial direction.

[0079] In this respect, the Fig. 6 and Fig. 13 has a configuration in which the input element of the second damper (ie the front cover plate 40) prevents over-rotation of the input element of the first damper (ie the cover plate 20), whereas in the embodiments shown in Fig. 16A, Fig. 16B and Fig. 17, the output member of the first damper (i.e., the driven plate 30) interferes with the rotation of the input member of the first damper. As described above, since the input member of the second damper rotates integrally with the output member of the first damper, the same result can be achieved regardless of whether either member interferes with the rotation of the input member of the first damper.

[0080] As described above, the inventors of the present invention have proposed a method for realizing a more compact vibration damping device structure by optimizing the arrangement of the springs, stoppers, and hysteresis elements.

[0081] While the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing its technical spirit or essential features. Therefore, the above-described embodiments should be considered as illustrative rather than restrictive. The scope of the present invention should be interpreted according to the following claims, and all technical ideas within the equivalent scope should be interpreted as being included within the scope of the present invention. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] KR 10-2238845

[0003]

Claims

[1] Vibration damping device comprising: a first damping unit having a first input element, a first output element and a first spring; a second damping unit having a second input element, a second output element and a second spring, the second damping unit being arranged axially outside the first damping unit; and a rotor unit having a rotor sleeve, and a mechanical stopper configured to limit the relative rotation between the first input member and the first output member or the second input member within a predetermined range. [2] Vibration damping device according to claim 1, wherein the first input element has a central hole, where the mechanical stopper has: a first projection projecting radially inward from the first input member toward the central hole; and a second projection projecting axially inwardly from the second input member toward the first input member, wherein the first protrusion and the second protrusion are configured to interfere with each other when the first input member or the second input member rotates. [3] The vibration damping device according to claim 1, wherein the mechanical stopper comprises: a first projection projecting axially inward from the first input member toward the first output member, wherein the first projection and the first output member are configured to interfere with each other when the first input member or the first output member rotates. [4] The vibration damping device according to claim 2, further comprising a hysteresis control means arranged rearward in the axial direction of the first output member, the hysteresis control means having a circumferential groove so as not to interfere with the second projection. [5] Vibration damping device according to claim 3, further comprising hysteresis control means arranged forward and / or backward in the axial direction of the first output member. [6] A vibration damping device according to claim 5, wherein at least one of the hysteresis control means has a groove into which the first projection can be inserted. [7] A vibration damping device according to claim 5, wherein a second projection is formed to project axially forward and / or rearward from the first output member, and at least one of the hysteresis control means has a groove into which the second projection can be inserted. [8] The vibration damping device according to claim 1, wherein the first input member is a cover plate and the second input member is a front cover plate. [9] A vibration damping device according to claim 1, wherein the first and second output members are each driven plates. [10] The vibration damping device according to claim 1, wherein the first output member and the second input member are coupled to be fixed to each other in a rotational direction. [11] The vibration damping device according to claim 1, wherein the first input member is attached to the rotor sleeve radially outwardly of the first spring. [12] Vibration damping device according to claim 1, wherein the first spring comprises an outer spring and an inner spring inserted inside the outer spring, wherein the first input member is attached to the rotor sleeve radially outwardly of either the outer spring or the inner spring of the first spring. [13] The vibration damping device according to claim 1, wherein the first input member is coupled to the rotor sleeve radially outwardly of a center of the first spring. [14] Vibration damping device according to claim 1, further comprising hysteresis control means arranged forward and / or backward in the axial direction of the first output member. [15] Vibration damping device according to claim 14, further comprising hysteresis control means arranged forward and / or backward in the axial direction of the second output element. [16] The vibration damping device according to claim 14 or 15, wherein the hysteresis control means comprises at least one selected from the group consisting of a friction disk, a metal disk and an elastic disk.

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