Torsional vibration damper with spoke springs

Abstract

The invention relates to a torsional vibration damper (10) for reducing torsional vibrations in a drive train of a vehicle, comprising an inner component (14) rotatable about an axis of rotation (12), several circumferentially spaced spoke springs (16), an outer component (18) rotatably connected to the inner component (14) via the spoke springs (16) and rotatable to a limited extent relative to the inner component (14) against a spring force of the spoke springs (16), and at least one friction element (42) arranged frictionally between the inner component (14) and the outer component (18), wherein at least one of the spoke springs (16) is coupled to the friction element (42) by forming a free angle (50) which allows rotation between the spoke spring (16) and the at least one friction element (42).

Description

[0001] The invention relates to a torsional vibration damper according to the preamble of claim 1.

[0002] German patent DE 10 2016 207 100 A1 describes a vibration damper with spoke springs arranged between an outer ring forming a damping mass and a mounting disc for attachment to a shaft. The outer ring bears against a friction surface, providing friction.

[0003] The object of the present invention is to protect the spoke springs from overloading. Excessive twisting angles between the inner and outer components are to be prevented.

[0004] At least one of these tasks is solved by a torsional vibration damper with the features according to claim 1. This allows the torsional vibration damper to be built more robustly and to reduce torsional vibrations more effectively. The spoke springs can be protected from overloading.

[0005] The vehicle can be a motor vehicle, a truck, or a two-wheeled vehicle.

[0006] The torsional vibration damper can be arranged between a drive element, in particular an internal combustion engine, and a driven element, in particular a transmission. The drive element can provide drive power for propelling the vehicle.

[0007] The torsional vibration damper can transmit at least part of the torque from the drive element towards the driven element. The torsional vibration damper can be arranged in series in the torque transmission path between the drive element and the driven element.

[0008] The torsional vibration damper can be a torsional vibration absorber that is arranged in parallel to a torque transmission path between the drive element and the driven element.

[0009] The internal component can be connected to a primary or secondary mass. The external component can be connected to a secondary or primary mass. The torsional vibration damper can be a dual-mass flywheel.

[0010] The outer component can be at least partially integrated with the spoke spring(s). The inner component and / or the outer component can be composed of several parts. The spoke springs can be manufactured as a single unit.

[0011] The friction element can generate friction during a rotational movement between the inner and outer components. This can dampen resonant vibrations. The friction element can make contact with a friction surface. The friction element can be rotationally fixed to either the inner or outer component. The friction surface can be located on the outer component, the inner component, or on a component that is rotationally fixed to each of them.

[0012] The spoke spring can have a greater radial extension than its axial and / or circumferential extension. The spoke spring can be connected to at least one other spoke spring radially outward, in particular via an outer ring, and / or radially inward, in particular via an inner ring. The outer ring can be associated with the outer component. The inner ring can be associated with the inner component.

[0013] The spoke spring, together with other circumferentially offset spoke springs connected to it via the outer ring and / or the inner ring, can form a spoke spring washer. The spoke spring washer can be a stamped component. The torsional vibration damper can have at least two such spoke spring washer units. The spoke spring washer units can be arranged axially offset from one another. The spoke spring washer units can be axially abutting one another.

[0014] Starting from a neutral position, the spoke spring can be rotated relative to the friction element in only one or in both circumferential directions. The clearance angle can allow rotation of the spoke spring relative to the friction element in only one circumferential direction or in both circumferential directions. The spoke spring can be deflected relative to the friction element by the same amount, a lesser amount, or a greater amount in one circumferential direction than in the opposite circumferential direction.

[0015] The coupling between the spoke spring and the friction element can be a positive-locking connection that allows limited rotation, particularly in both circumferential directions, within the clearance angle and, upon reaching the clearance angle, particularly in one circumferential direction or in the opposite circumferential direction, is a circumferentially effective positive-locking connection that prevents further rotation of the spoke spring relative to the friction element.

[0016] The torsional vibration damper can have an additional friction element. The spoke spring can be coupled to the additional friction element, forming a clearance angle that allows rotation between the spoke spring and the additional friction element. The coupling can be a positive-locking connection that allows limited rotation within the clearance angle. The clearance angle can be the same as the clearance angle formed by the coupling between the spoke spring and the friction element. This allows the spoke spring to simultaneously bear against both the friction element and the additional friction element when the equivalent clearance angle is reached. The friction element and the additional friction element can be arranged axially spaced apart from each other. The spoke springs can be arranged axially between the friction element and the additional friction element.

[0017] The rotational freedom between the spoke spring and the friction element, determined by the clearance angle, can also determine the rotational freedom between the outer component and the inner component.

[0018] In a preferred embodiment of the invention, it is advantageous if the first spoke spring engages positively with the friction element, forming the clearance angle. During assembly, the spoke spring and the friction element can be axially brought together to form the positive engagement.

[0019] In a preferred embodiment of the invention, it is advantageous if the clearance angle defines a maximum angle of rotation between the inner component and the outer component. If the clearance angle is exhausted in one of the circumferential directions, the spoke spring can exhibit the maximum angle of rotation relative to the friction element in the circumferential direction.

[0020] In a specific embodiment of the invention, it is advantageous if the maximum angle of rotation between the spoke spring and the friction element is determined by a stop of the spoke spring against the friction element. When the spoke spring stops against the friction element, the spoke spring can bear against the friction element on its circumference.

[0021] In a specific embodiment of the invention, it is advantageous if the friction element is rotationally fixed to the inner or outer component and bears against the outer or inner component in a frictionally effective manner. This allows friction to be generated during rotation between the outer and inner components. This can dampen potential resonance vibrations.

[0022] In a preferred embodiment of the invention, the coupling is arranged to overlap the outer component at least partially radially. The coupling can be arranged radially inside the outer ring.

[0023] In a preferred embodiment of the invention, it is advantageous if the friction element has at least one offset section on an outer circumference with at least one recess into which the spoke spring engages in a form-fitting manner, creating the clearance angle. The offset section can be axially extended from a substantially radially extending section of the friction element. The offset section can be axially extended from the substantially radially extending section opposite the side disc that frictionally contacts the friction element.

[0024] In a preferred embodiment of the invention, the recess on the outer circumference is open radially outwards. The areas circumferentially between the recesses can be designed as fingers on the outer circumference and engage circumferentially between the spoke springs.

[0025] In an advantageous embodiment of the invention, a stop surface is provided on the bent section opposite the spoke spring in the circumferential direction, for the spoke spring to bear against the spoke spring at a maximum angle of rotation. The stop surface can be an edge surface of the recess.

[0026] In a specific embodiment of the invention, it is advantageous if the friction element is designed as a diaphragm spring or disc spring. This allows the friction element to bear against a friction surface with an axial preload force, thus generating friction.

[0027] Further advantages and advantageous embodiments of the invention will become apparent from the description of the figures and the illustrations. Character description

[0028] The invention is described in detail below with reference to the illustrations. These show, in detail: Fig. 1: A spatial cross-section of a torsional vibration damper in a special embodiment of the invention. Fig. 2: A spatial view of the torsional vibration damper made of Fig. 1. Fig. 3: A section of a side view of the torsional vibration damper in a neutral position. Fig. 4: A section of a side view of the torsional vibration damper at a maximum angle of rotation.

[0029] Fig. Figure 1 shows a three-dimensional cross-section of a torsional vibration damper in a specific embodiment of the invention. The torsional vibration damper 10 is arranged between a drive element, in particular an internal combustion engine, and an output element, in particular a transmission, to reduce torsional vibrations in a vehicle's drivetrain. The torsional vibration damper 10 comprises an inner component 14 rotatable about an axis of rotation 12 and connected to the internal combustion engine, several circumferentially spaced spoke springs 16, and an outer component 18 rotatably connected to the inner component 14 via the spoke springs 16 and rotatable relative to the inner component 14 against a spring force of the spoke springs 16, subject to limited rotation. The inner component 14 comprises a hub 20 and a support disc 22 rigidly connected thereto, and the spoke spring 16 is arranged axially between the hub 20 and the support disc 22.

[0030] The individual spoke spring 16 has a greater extension in the radial direction 24 than in the axial direction 26 and in the circumferential direction 28 and is connected radially to the other spoke springs 16 via an outer ring 30. The outer ring 30 and the spoke springs 16 are preferably formed in one piece. Thus, the spoke spring 16, together with the other circumferentially offset spoke springs 16 connected to it via the outer ring 30, forms a spoke spring disc 32.

[0031] The torsional vibration damper 10 comprises several such axially adjacent, and in particular axially abutting, spoke spring discs 32, which are radially connected to the outer component 18 via rivet elements 34. For this purpose, the spoke spring discs 32 have recesses 36 radially outside and radially inside the outer ring 30 for the passage of the rivet elements 34.

[0032] The outer component 18 is formed by the outer ring 30, a first side disc 38, and a second side disc 40, which is firmly connected to it via the rivet elements 34. The spoke spring washers 32 are arranged axially between the first and second side discs 38 and 40.

[0033] The torsional vibration damper 10 comprises a friction element 42, here a diaphragm spring 44, and a further friction element 46, also a diaphragm spring 44, axially offset to it, which are rigidly connected to the inner component 14 via further rivet elements 48. The spoke springs 16 are arranged axially between the friction element 42 and the further friction element 46. The friction element 42 and the further friction element 46 are arranged axially between the first and second side disks 38, 40. The friction element 42 bears against the first side disk 38 and the further friction element 46 against the second side disk 40 with an axial preload force effected by the respective diaphragm spring 44.

[0034] The spoke springs 16 are each coupled to the friction element 42 and the further friction element 46 by a clearance angle 50 that allows rotation between the respective spoke spring 16 and the friction element 42. For this purpose, the spoke spring 16 engages positively in a recess 52 in a bent section 54 on an outer circumference 56 of the friction element 42 and in a further recess 58 in a further bent section 60 of the further friction element 46, each forming the clearance angle 50. The recess 52 and the further recess 58 are open radially outwards. The positive engagement 61 is arranged to overlap the outer component 18 at least partially radially. The bent section 54 and the further bent section 60 can be non-contacting with each other.The coupling between the spoke spring 16 and the friction element 42, as well as between the spoke spring 16 and the further friction element 46, is a positive-locking connection that allows limited rotation within the clearance angle and, upon reaching the clearance angle, is a circumferentially effective positive-locking connection that prevents further rotation of the spoke spring 16 relative to the friction element 42 and the further friction element 46.

[0035] Fig. Figure 2 shows a spatial view of the torsional vibration damper made of Fig. 1. The spoke springs 16 are aligned here in a neutral position with respect to any rotation of the spoke springs 16 relative to the friction element 42. The second side disk 40 is shown broken out to illustrate the coupling. On the bent section 54 of the friction element 42, a stop surface is provided on an edge surface of the recess opposite the respective spoke spring 16 in the circumferential direction 28 for the contact of the spoke spring 16 at the maximum angle of rotation. On the further bent section 60 of the further friction element 46, a further stop surface 66 is provided on another edge surface 68 of the recess 52 opposite the respective spoke spring 16 in the circumferential direction 28 for the contact of the spoke spring 16 at the maximum angle of rotation.

[0036] Fig. Figure 3 shows a section of a side view of the torsional vibration damper in a neutral position and Fig. 4 at a maximum angle of rotation. In the neutral position of the spoke spring 16 relative to the friction element 42 in Fig. 3, and thus a neutral position of the outer component 18 relative to the inner component 14, the clearance angle 50, which defines the maximum rotation angle 70 between the inner component 14 and the outer component 18 in a first circumferential direction 72 and in a second circumferential direction 74, is the same in both circumferential directions. The spoke spring 16 can therefore rotate relative to the friction element 42 by the same amount in the first circumferential direction 72 as in the second circumferential direction 74.

[0037] The maximum angle of rotation 70 between the spoke spring 16 and the friction element 42 is determined by a stop 76 of the spoke spring 16 on the stop surface 78 of the friction element 42 during the positive engagement, as shown in Fig.Figure 4 shows the spoke spring 16 twisted in the first circumferential direction 72 up to the maximum angle of rotation 70 relative to the friction element 42 and bearing against the stop surface 78 of the recess 52 in the friction element 42. This prevents further deflection of the spoke spring 16 and protects the spoke spring 16 from overload. Reference symbol list 10 torsional vibration dampers 12 Rotation axis 14 Interior component 16 spoke springs 18 Exterior component 20 hub 22 Support disc 24 radial direction 26 axial direction 28 Circumferential direction 30 outer ring 32 spoke spring washer 34 rivet element 36 recess 38 first side window 40 second side window 42 Friction element 44 Diaphragm spring 46 additional friction element 48 additional rivet elements 50 free angles 52 recess 54 bent section 56 External circumference 58 more recesses 60 further bent section 61 Form-fitting intervention 66 additional stop surfaces 68 additional border area 70° maximum twist angle 72 first circumferential direction 74 second circumferential direction 76 attacks 78 Stop surface QUOTES INCLUDED IN THE DESCRIPTION

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

[0000] DE 10 2016 207 100 A1

[0002]

Claims

Torsional vibration damper (10) for reducing torsional vibrations in a drive train of a vehicle, comprising an inner component (14) rotatable about an axis of rotation (12), several circumferentially spaced spoke springs (16), an outer component (18) rotatably connected to the inner component (14) via the spoke springs (16) and rotatable to a limited extent against a spring force of the spoke springs (16) relative to the inner component (14), at least one friction element (42) arranged to provide friction between the inner component (14) and the outer component (18), characterized in that at least one of the spoke springs (16) is coupled to the friction element (42) in a manner that forms a free angle (50) allowing rotation between the spoke spring (16) and the at least one friction element (42). Torsional vibration damper (10) according to claim 1, characterized in that the spoke spring (16) engages in the friction element (42) in a form-fitting manner, forming the clearance angle (50). Torsional vibration damper (10) according to claim 1 or 2, characterized in that the clearance angle (50) specifies a maximum rotation angle (70) between the inner component (14) and the outer component (18). Torsional vibration damper (10) according to claim 3, characterized in that the maximum angle of rotation (70) between the spoke spring (16) and the friction element (42) is determined by a stop (76) of the spoke spring (16) on the friction element (42). Torsional vibration damper (10) according to one of the preceding claims, characterized in that the friction element (42) is rotationally fixed to the inner component (14) or the outer component (18) and is frictionally in contact with the outer component (18) or inner component (14). Torsional vibration damper (10) according to one of the preceding claims, characterized in that the coupling (61) is arranged at least partially radially overlapping with the outer component (18). Torsional vibration damper (10) according to one of the preceding claims, characterized in that the friction element (42) has at least one cranked section (54) with at least one recess (52) on an outer circumference (56), into which the spoke spring (16) engages in a form-fitting manner, forming the clearance angle (50). Torsional vibration damper (10) according to claim 7, characterized in that the recess (52) on the outer circumference (56) is open radially outwards. Torsional vibration damper (10) according to claim 7 or 8, characterized in that a stop surface (78) for contact of the spoke spring (16) at a maximum rotation angle (70) is provided on the cranked section (54) in circumferential direction (28) opposite the spoke spring (16). Torsional vibration damper (10) according to one of the preceding claims, characterized in that the friction element (42) is designed as a diaphragm spring (44) or disc spring.

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