Torsional vibration damper with a vibration damper and a viscous medium

Abstract

The invention relates to a torsional vibration damper (10) for reducing torsional vibrations, comprising a housing (14) surrounding an interior space (12) and, within the interior space (12), a vibration damper (18) rotatable about an axis of rotation (16) with a radially outer mass element (32), with a radially inner mounting area (34), and with several circumferentially distributed and each extending mainly radially and connecting the mass element (32) to the mounting area (34), wherein the mass element (32) is rotatable relative to the mounting area (34) at least against the spring force of the spoke springs (36), wherein a viscous medium (22) is received in the interior space (12), at least partially surrounding the vibration damper (18), for damping the relative rotational movement between the vibration damper (18) and the housing (14), and the interior space (12) is sealed with respect to the viscous medium (22).

Description

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

[0002] DE 10 2015 213 653 A1 describes a torsional vibration damper for reducing torsional vibrations, comprising a housing surrounding an interior space and, within the interior space, a vibration absorber rotatable about a rotational axis, having a radially outer flywheel ring, a radially inner connecting section and a plurality of spoke springs distributed around the circumference and each extending mainly radially and connecting the flywheel ring to the connecting section, wherein the flywheel ring is rotatable to a limited extent relative to the connecting section, at least counter to the spring force of the spoke springs.

[0003] The objective of the present invention is to dampen torsional vibrations more effectively. The torsional vibration damper should be space-saving, quiet, cost-effective, and reliable.

[0004] At least one of these objects is achieved by a torsional vibration damper having the features of claim 1. This allows critical material stresses in the torsional vibration damper to be reduced. The torsional vibration damper can be designed more reliably and cost-effectively, and has a longer service life. Furthermore, the vibration absorber can be better protected against rust. Axial vibrations of the vibration absorber can also be reduced.

[0005] The torsional vibration damper can be arranged on a drive element, in particular an internal combustion engine. The torsional vibration damper can be arranged inside or outside a drive housing of the drive element. The drive housing can be an engine housing, in particular a crankshaft housing.

[0006] The torsional vibrations can originate from the drive element.

[0007] The housing can be directly connected to a torque-transmitting component or form a torque-transmitting component. The torque-transmitting component can be connected to a crankshaft of the internal combustion engine. The housing can be connected to the crankshaft in a torque-transmitting manner.

[0008] The vibration damper can have a single natural frequency or multiple natural frequencies with respect to a torsional vibration of the mass element relative to the mounting area. At least one natural frequency of the vibration damper can be adapted to a resonant frequency of the torsional vibrations present at the mounting area.

[0009] The spoke spring has a cross-section perpendicular to a main extension direction of the spoke spring, the maximum dimension of which is many times smaller than the extension of the spoke spring along the main extension direction. The spoke spring can have an extension along the main extension direction that is many times, in particular more than 5, preferably more than 10 times greater than a maximum extension of the spoke spring in a direction perpendicular to the main extension direction. The main extension direction can correspond to the radial direction or at least form an angle with the radial direction of less than 45°.

[0010] The viscosity medium can be a liquid, in particular an oil, preferably a silicone oil or a grease. The viscosity medium can be filled during assembly of the housing. The viscosity medium can be filled after assembly of the housing, for example, through at least one filling opening in the housing.

[0011] The damping of the relative rotational movement between the vibration absorber and the housing can mainly take place between the mass element and the housing.

[0012] During damping, the kinetic energy of the relative rotational movement can be converted primarily into heat energy by the viscous friction of the viscous medium. Viscous friction can depend on shear stresses in the viscous medium and thus also on the relative rotational speed between the housing and the mass element, the viscous medium and the adjacent materials, and / or the geometry.

[0013] The housing can be constructed from several parts, consisting of several housing components. The housing can have at least one sealing element for sealingly receiving the viscous medium. The sealing element can be arranged radially and / or axially between the housing components.

[0014] In a preferred embodiment of the invention, it is advantageous if a gap is present between the mass element and the housing, which gap can be at least partially filled with the viscosity medium. The gap can be completely filled with the viscosity medium. The filling of the gap with the viscosity medium can depend on a rotational movement of the vibration damper about the axis of rotation. During a rotational movement of the vibration damper, the gap can be filled with the viscosity medium and can be unfilled when the vibration damper is not rotating. If the entire interior is filled with the viscosity medium, the gap can be filled independently of the rotational movement of the vibration damper.

[0015] In a specific embodiment of the invention, it is advantageous if the gap is formed radially between the housing and the mass element. The gap can be formed radially outside the mass element. The gap can be arranged between an outer circumference of the mass element and an inner circumference of the housing.

[0016] The mass element can be disc-shaped with a constant outer diameter in the axial direction. The housing can have a constant inner diameter radially opposite the mass element in the axial direction. The gap can be radially formed between the inner diameter and outer diameter.

[0017] In a preferred embodiment of the invention, it is advantageous if the gap is formed axially between the housing and the mass element. The gap can be formed axially on both sides of the mass element between the mass element and the housing. The gap can be continuous or interrupted in the circumferential direction. The gap can be extended to a limited extent in the circumferential direction.

[0018] The gap can be axially arranged between the housing and the spoke spring axially opposite the housing.

[0019] In an advantageous embodiment of the invention, the vibration damper is constructed from at least two axially adjacent damper elements, each comprising a mass component, several spoke spring components, and a fastening component. The mass components form the mass element, the spoke spring components form the spoke springs, and the fastening component forms the fastening area. The damper elements can be axially adjacent to one another. To form the spoke springs, the spoke spring components can be axially aligned or circumferentially offset from one another and thus axially non-aligned.

[0020] In a preferred embodiment of the invention, it is advantageous if the first and second damper elements are designed as identical parts. This allows the vibration damper to be designed more cost-effectively.

[0021] A preferred embodiment of the invention is advantageous in which the damper elements are axially clamped together by a clamping connection at the fastening area. The damper elements can be caulked together and / or to a connecting component. The damper elements can be connected to each other and / or to a connecting component in a form-fitting, force-fitting, and / or material-fitting manner. The damper elements can be screwed together by at least one screw element. The connecting component can be firmly connected to the housing.

[0022] The mounting area can be firmly connected to the housing by the clamp connection.

[0023] In a preferred embodiment of the invention, it is advantageous if the clamping connection is established by the tensioning force of at least one connecting element. The connecting element can be arranged radially inside the spoke springs, radially overlapping the spoke springs, or radially outside the spoke springs. The connecting element can be arranged in the fastening area. The connecting element can extend through at least one through-opening in the fastening area.

[0024] A preferred embodiment of the invention is advantageous in which the housing has at least two housing components that are symmetrical to one another with respect to a radial direction. This allows the torsional vibration damper to be designed more cost-effectively. The housing can be formed primarily by the two housing components.

[0025] A preferred embodiment of the invention is advantageous in which the mass element is mounted relative to the housing by at least one bearing element. This allows for better absorption of adverse effects of axial vibrations on the gap. The mass element can be mounted axially relative to the housing by the bearing element. The bearing element can be a rolling bearing, a plain bearing, or in particular a plastic ring. The bearing element can be mounted centrally on the mass element or the housing.

[0026] Further advantages and advantageous embodiments of the invention emerge from the description of the figures and the illustration. Character description

[0027] The invention is described in detail below with reference to the figure. It shows: Fig. 1 to 5: A cross section of a torsional vibration damper, each in a specific embodiment of the invention.

[0028] In Fig. 1 shows a torsional vibration damper in a specific embodiment of the invention. The torsional vibration damper 10 comprises a housing 14 surrounding an interior space 12 and, within the interior space 12, a vibration absorber 18 rotatable about a rotation axis 16. The housing 14 is formed by two housing components that are symmetrical to one another with respect to a radial direction 20 and that delimit the interior space 12. The interior space 12 is at least partially filled with a viscosity medium 22 and is sealed with respect to the viscosity medium 22 by a radially outer first sealing element 24 and a radially inner second sealing element 26. The first and second sealing elements 24, 26 are arranged axially between the first housing component 28 and the second housing component 30 of the housing components and are preferably designed as a sealing ring.

[0029] The vibration damper 18 comprises a radially outer mass element 32, a radially inner fastening region 34 and a plurality of spoke springs 36 distributed around the circumference and each extending mainly radially and connecting the mass element 32 to the fastening region 34. The mass element 32 is rotatable to a limited extent relative to the fastening region 34, at least counter to the spring force of the spoke springs 36.

[0030] The vibration damper 18 is constructed from a plurality of axially adjacent damper elements 38, which are in particular designed as identical parts, each comprising a mass component 40, a plurality of circumferentially distributed spoke spring components 42, and a fastening component 44. The mass components 40 form the mass element 32, the spoke spring components 42 form the spoke springs 36, and the fastening component 44 forms the fastening region 34. The damper elements 38 are axially clamped to one another and to the housing 14 by a clamping connection at the fastening region 34.

[0031] The first and second housing components 28, 30 are firmly connected to one another by connecting elements 46, and the damper elements 38 are axially clamped to one another by the connecting element 46, and the fastening area 34 is axially clamped to the housing 14. As a result, the fastening area 34 is firmly connected to the housing 14. The clamping connection is established by the clamping force of the connecting elements 46, with the connecting elements 46 being arranged radially inside the fastening area 34 and the spoke springs 36.

[0032] The viscosity medium 22 present in the interior 12, in particular an oil, preferably a silicone oil, at least partially surrounds the vibration damper 18. During operation of the torsional vibration damper 10, when the interior 12 is partially filled with the viscosity medium 22 due to the rotational movement of the housing 14 and the vibration damper 18, the viscosity medium 22 is present in the radially outer region of the interior 12.

[0033] A gap 48 is present between the mass element 32 and the housing 14, which gap is at least partially filled with the viscosity medium 22 during operation of the torsional vibration damper 10. The gap 48 is formed radially on the one hand and, adjacently, axially between the housing 14 and the mass element 32. The gap 48 extends axially on both sides of the mass element 32. A relative rotational movement between the housing 14 and the mass element 32 is dampened by the viscosity medium 22 in the gap 48.

[0034] Fig. Figure 2 shows a torsional vibration damper 10 in a further specific embodiment of the invention. The structure of the torsional vibration damper 10 is similar to that of Fig. 1 except for the following differences. The mass element 32 is axially supported relative to the housing 14 by a first bearing element 50 and a second bearing element 52. This allows the mass element 32 to be axially guided relative to the housing 14. The first bearing element 50 is arranged directly between the vibration damper 18 and the first housing component 28, and the second bearing element 52 is arranged directly between the vibration damper 18 and the second housing component 30. The first and second bearing elements 50, 52 each have a centering section 54 radially outside of the mass element 32 for radial centering on the mass element 32. The centering section 54 can also be omitted.

[0035] In Fig. 3 shows a torsional vibration damper 10 in a further specific embodiment of the invention. The structure is similar to that of Fig. 2 except for the following differences. The first and second bearing elements 50, 52 have the centering section 54 radially inward of the mass element 32.

[0036] Fig. Figure 4 shows a torsional vibration damper 10 in a further specific embodiment of the invention. The structure of the torsional vibration damper 10 is similar to that of Fig. 1 except for the following differences. The connecting element 46 extends through the fastening area 34 and penetrates a first through-opening 56 in the first housing component 28 and an axially opposite second through-opening 58 in the second housing component 30. The fastening area 34 has a through-opening 60 for receiving the connecting element 46. The first through-opening 56 is arranged by a sealing ring 62, in particular between the first housing component 28 and a closure head of the connecting element 46, in order to seal the interior 12 with respect to the viscous medium 22. The second through-opening 58 is also sealed by a further sealing ring 64.

[0037] Fig. Figure 5 shows a torsional vibration damper 10 in a further specific embodiment of the invention. The structure of the torsional vibration damper 10 is similar to that of Fig.1 except for the following differences. The first and second housing components 28, 30 are firmly connected to one another by a connecting element (not shown here). The connecting element, in particular, fastens the first and second housing components 28, 30 to a connecting component (not shown here), for example, a crankshaft. Thus, the connecting element fastens the first and second housing components 28, 30 to one another on the one hand, and also fastens the torsional vibration damper 10 to the connecting component on the other. List of reference symbols 10 torsional vibration dampers 12 Interior 14 housings 16 axis of rotation 18 vibration dampers 20 radial direction 22 Viscosity medium 24 first sealing element 26 second sealing element 28 first housing component 30 second housing component 32 mass element 34 Mounting area 36 spoke spring 38 absorber element 40 Mass component 42 Spoke spring component 44 Fastening component 46 connecting element 48 gap 50 first bearing element 52 second bearing element 54 Centering section 56 first passage opening 58 second passage opening 60 passage opening 62 sealing ring 64 additional sealing ring 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] DE 10 2015 213 653 A1

[0002]

Claims

[1] Torsional vibration damper (10) for reducing torsional vibrations, comprising a housing (14) surrounding an interior space (12) and within the interior space (12) a vibration damper (18) rotatable about a rotational axis (16) with a radially outer mass element (32), with a radially inner fastening region (34) and with a plurality of circumferentially distributed and each extending mainly radially and connecting the mass element (32) to the fastening region (34), wherein the mass element (32) is rotatable to a limited extent relative to the fastening area (34), at least against the spring force of the spoke springs (36), characterized by , that in the interior space (12) a viscosity medium (22) which at least partially surrounds the vibration damper (18) is accommodated for damping the relative rotational movement between the vibration damper (18) and the housing (14), and the interior space (12) is sealed with respect to the viscosity medium (22). [2] Torsional vibration damper (10) according to claim 1, characterized by that between the mass element (32) and the housing (14) there is a gap (48) which can be at least partially filled with the viscosity medium (22). [3] Torsional vibration damper (10) according to claim 2, characterized by that the gap (48) is radially formed between the housing (14) and the mass element (32). [4] Torsional vibration damper (10) according to claim 2 or 3, characterized by that the gap (48) is formed axially between the housing (14) and the mass element (32). [5] Torsional vibration damper (10) according to one of the preceding claims, characterized bythat the vibration damper (18) is constructed from at least two axially adjacent damper elements (38) each having a mass component (40), a plurality of spoke spring components (42) and a fastening component (44), wherein the mass components (40) form the mass element (32), the spoke spring components (42) form the spoke springs (36) and the fastening component (44) forms the fastening region (34). [6] Torsional vibration damper (10) according to claim 5, characterized by that the first and second damper elements (38) are designed as identical parts. [7] Torsional vibration damper (10) according to claim 5 or 6, characterized by that the damper elements (38) are axially clamped together by a clamping connection on the fastening area (34). [8] Torsional vibration damper (10) according to claim 7, characterized bythat the clamping connection is constructed by the clamping force of at least one connecting element (46), wherein the connecting element (46) is arranged radially inside the spoke springs (36). [9] Torsional vibration damper (10) according to one of the preceding claims, characterized by that the housing (14) has at least two housing components (28, 30) which are symmetrical to one another with respect to a radial direction (20). [10] Torsional vibration damper (10) according to one of the preceding claims, characterized by that the mass element (32) is mounted relative to the housing (14) by at least one bearing element (50, 52).

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