Torsional vibration damper, output assembly and flange for a torsional vibration damper

Abstract

The invention relates to a torsional vibration damper (1, 40) having an input assembly (2) and an output assembly (3, 41), wherein the input assembly (2) and the output assembly (3, 41) can be limitedly pivoted relative to one another about an axially oriented rotational axis (5) of the torsional vibration damper (1, 40) under the influence of an elastic spring resistance of at least one torsional vibration damper (4). The input assembly (2) has an input part (6) which is provided with a plurality of through-holes (7) distributed about the rotational axis (5). The output assembly (3, 41) has at least one first flange (8) with an entry opening (14, 48) and at least one second flange (18) which is in contact with the first flange (8). According to the invention, a measure is provided for protecting the torsional vibration damper (4) from fluid ingress. The measure provides a groove (16, 49) in the first flange (8), which is coupled with the entry opening (14, 48).

Description

Technical Field

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

[0002] A torsional vibration damper is known from DE 10 2020 112 350 A1. Summary of the Invention

[0003] The objective of this invention is to improve the sealing performance of torsional vibration dampers against water intrusion.

[0004] This task is solved by the torsional vibration damper according to claim 1.

[0005] At the contact area, the annular component and one of the flanges contact each other and are directly abutting each other. Preferably, the annular component and the flange contact each other in an axially planar manner at the contact area located in a radial plane. Optionally, the contact area also extends axially across multiple radial planes. One of the flanges, namely the first flange, is a secondary side flange with a hub, and is hereinafter referred to as the hub flange. The hub is a connecting element for connecting the torsional vibration damper to the vehicle clutch and / or vehicle transmission. According to the invention, at least one groove is formed on the hub flange, which is circumferentially connected to the contact area radially below it. The groove is formed in the hub flange in an axially recessed manner. Inlet holes formed in the hub flange are in fluid communication with each other through the groove. This advantageously ensures that water guided into the area by centrifugal force is guided to the inlet holes via the groove and discharged outwards and away from the contact area through the inlet holes.

[0006] In embodiments of the invention, the annular component is a second flange, hereinafter referred to as the output flange. Optionally, the annular component is a sealing ring or a friction ring. The output flange preferably has radially projecting flange wings, each flange wing acting on at least one arcuately arranged compression spring. The compression spring is preferably one or more helical springs of a torsional damper.

[0007] Another embodiment of the invention specifies that the annular component protrudes radially inward from the contact area in a direction toward the axis of rotation and extends beyond the contact area. This protrusion is preferably a disc-shaped portion extending around the axis of rotation, which is axially opposed to a groove formed in the hub flange. This advantageously forms a collection groove between the protrusion and the groove, in which fluid is collected and can flow from the collection groove through the groove to the inlet hole and from there to the outside.

[0008] This invention is particularly applicable to torsional vibration dampers having multiple compression springs. These compression springs are housed in an annular chamber extending about the axis of rotation. Because, in this arrangement, the contact area between the output flange and the annular component begins radially inward in the groove and ends radially outward in the annular chamber, the measure according to the invention ensures that water will not creep into the normally grease-filled annular chamber via the contact area.

[0009] The present invention also provides an output assembly for a torsional vibration damper, wherein a hub flange and an output flange are advantageously connected to each other by means of a riveting connection to form a pre-assembled unit of a secondary assembly. Here, the contact area between the hub flange and the output flange is formed in a radial plane at least around the rivets of the riveting connection.

[0010] Finally, the present invention provides a hub flange configured in a disc shape and preferably made of sheet metal by cold forming and stamping. Inlet holes distributed around its axis of symmetry have an inner profile that deviates from the shape of an inner cylinder. Therefore, the inlet holes extend radially into the groove and / or radially beyond the groove. Here, the inner profile of the inlet hole extends radially beyond the groove to such an extent that it is approximately at the same radial height as the bottom of the collection tank and / or the beginning of the contact area. The radial internal dimension of the inlet hole is greater in the radial direction than in the tangential direction. Where the various inlet holes and through holes are brought to a position such that they are aligned, the tangential dimension of the inlet hole is equal to or greater than the diameter of the through hole. Due to the radial extension of the through hole, the inlet hole advantageously has a dual function. On the one hand, the screw connection between the primary side of the shock absorber and the engine can be accessed via the inlet hole. For example, the screws and tightening tools required for this screw connection can be guided through the inlet hole. On the other hand, the inlet hole acts as a drainage opening, by which water collected in the radially outer groove or collection tank can be guided from the contact area to the outside.

[0011] The groove formed in the hub flange can be composed of groove segments, each segment located between two inlet holes and having an inlet hole on each side. Optionally, the groove is configured to be circumferential. In this case, the edge of the groove is interrupted at the height of the inlet hole on the side facing the inlet hole, such that the groove intersects the edge of the corresponding inlet hole.

[0012] The primary input assembly and the secondary output assembly are capable of limited relative oscillation around the rotation axis of the torsional vibration damper under the resistance of the elastic springs. In other words, during oscillation, the torsional damper forms an elastic connection between the input assembly and the hub flange around the rotation axis in opposite circumferential directions. The torsional damper preferably consists of multiple compression springs or groups of compression springs distributed circumferentially around the rotation axis.

[0013] The annular component is, for example, a flange for a centrifugal pendulum or an output flange with flange wings. Alternatively, the annular component can also be a clamp of an overload clutch that clamps the output flange. Combinations of the above arrangements are also conceivable. Rigid flange connections, such as the connection between the output flange and the hub flange, are preferably made of rivets and / or screws. A contact area can also be additionally or optionally formed between the output flange / hub flange and / or a sealing ring or a friction ring. In this contact area, the sealing ring and / or friction ring presses against one of the flanges. In the contact area, the surfaces of the two components that are clamped or rigidly connected to each other are in contact with each other.

[0014] The hub flange can rotate about the axis of rotation relative to the input component, such that one of the through holes and one of the inlet holes are axially aligned with each other. This requires that the hole patterns in the input component and the hole patterns on the output flange are identical in terms of circumferential pitch and radial distance to the axis of rotation. That is, the corresponding through hole corresponds axially to one of the inlet holes such that the through hole, or the screw head used to tighten or loosen the input component during assembly or disassembly, can be accessed via the inlet hole.

[0015] The axis of symmetry of the hub flange lies on the rotation axis of the output assembly, which corresponds to the rotation axis of the torsional vibration damper. Preferably, the contact area is configured as a planar surface located in a radial plane perpendicularly intersected by the rotation axis. Alternatively, the contact area may extend across multiple radial planes in a nested manner. The circumferential direction around the rotation axis refers to the direction along the circumference of an imaginary circle located in a radial plane. The center of this circle is perpendicularly intersected by the rotation axis. In fluid technology, this means, for liquids, preferably water, that it is permeable and conductive.

[0016] The through-hole is preferably constructed as an inner cylinder. The inlet has an inner profile that deviates from a circle, wherein the radially lower section of the inlet is defined by a section constructed of an inner cylinder. The starting point of the radius of the inner cylindrical section is preferably located on the imaginary axial extension of the centerline of the through-hole. Attached Figure Description

[0017] The present invention will be described below with reference to embodiments. The accompanying drawings are not to scale. The drawings show: Figure 1 The torsional vibration damper 1 is shown in a longitudinal sectional view along the rotation axis 10 of the torsional vibration damper 1. Figure 2 Showing the combination Figure 1 Magnified detail X of the torsional vibration damper 1 Figure 3Another embodiment of the torsional vibration damper 40 is shown, using a longitudinal sectional view along the rotation axis 5 of the torsional vibration damper 41. Figure 4 Show Figure 3 A magnified view of detail Y in the image. Figure 5 The hub flange 8′ is shown as a separate component. Figure 6 Show Figure 5 A magnified view of the detail Z marked in the middle, showing the orientation of groove 16. Figure 7 Show Figure 5 Another enlarged view of the detail Z marked in the middle, showing an alternative orientation of another embodiment with slot 49. Detailed Implementation

[0018] Figure 1 A torsional vibration damper 1 is shown, which consists of an input assembly 2 on the primary side and an output assembly 3 on the secondary side. The input assembly 2, i.e., the primary assembly, has an input part 6 with a shell-like structure and a cover 28. The output assembly 3 consists of a first flange 8 configured as a hub flange 8' and a second flange 18 configured as an output flange 18'.

[0019] In this example, the annular component 15 is the output flange 18', which abuts against the end of the coil spring 26 via flange wings 27. The hub flange 8' and the output flange 18' are rigidly connected by rivets 9 and firmly abut against each other at the contact area 13. Another contact area 13' is formed axially between another annular component 15' and the second flange 18. This other annular component 15' is a sealing ring / friction ring 19, which is axially clamped between the input component 6 and the output flange 18' and centered on the corner ring 31.

[0020] Input component 2 and output component 3 are capable of limited relative oscillation about the axially oriented rotation axis 5 of torsional vibration damper 1 under the resistance of the elastic springs of torsional damper 4. The torsional damper 4 is composed of multiple helical springs 26 arranged in an arc around the rotation axis 5 in a circumferential direction. The helical springs 26 are supported at their ends on input component 2 in one circumferential direction (not visible in the figure). In another direction, the helical springs 26 are supported on the flange wing 27 of output flange 18′. Input component 6 and cover 28 together define an annular chamber 20 in which the helical springs 26 are housed. Input component 6 has multiple through holes 7 distributed around the rotation axis 5. An axially penetrating screw hole 32 is axially abutted against input component 6. The through holes 7 and screw holes 32 are equidistant from the rotation axis 5 by a distance R corresponding to the radius R of the circle containing the holes. The holes are of the same size, so that after rotation, one of the through holes 7 is axially aligned with one of the screw holes 32, that is, their center lines coincide with each other and have the same distance R from the axis of rotation 5.

[0021] The output assembly 3 includes a hub flange 8' and at least one annular component 15 rigidly connected to the hub flange 8' in the form of an output flange 18' by means of rivets 9. The hub flange 8' includes a hub 30 for connection to a clutch or gearbox (not shown). The hub 30 extends into a connecting section 36 that connects the hub 30 to a rivet flange 39. The connecting section 36 has axially through entry holes 14 and is rotatable relative to the input component 6 about a rotation axis 5, such that each entry hole 14 is axially aligned with one of the screw holes 32 relative to one of the through holes 7.

[0022] The corresponding through hole 7 is constructed as an inner cylinder. The inlet hole 14 has an inner contour that deviates from a circle, wherein the radially lower arc segment 14a of the inlet hole 14 is an inner cylinder. The starting point P of the radius R1 of the arc segment 14a is preferably located on the imaginary axial extension of the centerline 34 of the through hole 7. The distance R between the centerline 34 of the corresponding through hole 7 and the axis of rotation 5 is equal to the distance between the starting point P of the radius R1 of the arc segment 14a and the axis of rotation 5. The distance R is also the radius of two identical hole circles surrounding the axis of rotation 5, on which the through hole 7 and the inlet hole 14 lie.

[0023] Figure 2- The annular component 15 axially abuts against the hub flange 8' on the side facing the input component 6. The first portion 11 of the hub flange 8' and the second portion 12 of the annular component 15 contact and abut against each other at a contact area 13 extending along an imaginary radial plane E. The contact area 13 begins radially below the rivet 9 and extends from there to radially below the sealing friction ring 24. The friction ring 24 is radially held on the cover 28 of the input component 6, but has limited axial movement, and is axially preloaded against the output flange 18' by means of a disc spring 37.

[0024] A collection trough 33 is advantageously formed between the disc-shaped portion 29 and the groove 16, in which fluid is collected and guided from the collection trough via the groove 16 to the inlet port 14 and can flow out from there. Here, the groove 16 opens into the inlet port 14. In addition, another contact area 13' extends between another annular component 15' configured as a sealing and / or friction ring 19 and the output flange 18'. This other annular component 15' is a sealing ring / friction ring 19 that is axially clamped between the input component 6 and the output flange 18' and radially guided on the corner ring 31. The contact area 13' extends to the edge of the annular chamber 20.

[0025] Figure 5 – Figure 5 An embodiment of a hub flange 8′ is shown, which is made from sheet metal by cold forming and stamping. The hub flange 8′ is configured as a cup shape and has a hub 30 at the bottom of the cup, on which internal teeth 38 for a shaft-hub connection (not shown) are formed. The edge of the cup is formed by a riveted flange 39 having riveted holes 39a. The riveted flange 39 and the hub 30 are connected to each other by a connecting section 36. The connecting section 36 is provided with an inlet hole 14 having an inner profile that deviates from a circle. However, each inlet hole 14 has an inner cylindrical arc segment 14a or an inner cylindrical segment 14a that connects radially inward to the hole circle L and is defined by a radius R1, such as Figure 5 The example below represents all the access holes 14. The starting point P of radius R1 lies on the hole circle L of the access hole 14 extending around the axis of rotation 5, which also lies on the through hole 7 and the screw hole 32 (see [reference]). Figure 1 On the hole circle.

[0026] Figure 6 The groove 16 is interrupted in the circumferential direction by the inlet hole 14. Therefore, the groove 16 is divided into a plurality of arcuate segments 16a, each arcuate segment extending from one inlet hole 14 to another. Each end of the arcuate segment 16a passes into one of two adjacent inlet holes 14 in the circumferential direction.

[0027] Figure 3A torsional vibration damper 40 is shown, which consists of an input assembly 2 on the primary side and an output assembly 41 on the secondary side. The input assembly 2, i.e., the primary assembly, has an input part 6 with a housing-type construction and a cover 28. The output assembly 41 consists of a first flange 8 constructed as a hub flange 8″ and a second flange 18 constructed as an output flange 18″.

[0028] The output flange 18″ rests against the end of the coil spring 26 via the flange wing 27. The hub flange 8″ and the output flange 18″ are rigidly connected and firmly abutted by rivets 9. An axial contact area 13 is formed between the annular component 15 and the second flange 18. The annular component 15 is a sealing ring / friction ring 50, which sits on the corner ring 42 and is axially clamped between the input component 6 or the corner ring 42 and the hub flange 8″, and presses against the output flange 18″ at the contact area 13.

[0029] Input component 2 and output component 41 are capable of limited relative oscillation about the axially oriented rotation axis 5 of the torsional vibration damper 40 under the resistance of the elastic springs of the torsional damper 4. The torsional damper 4 is composed of multiple helical springs 26 arranged in an arc shape around the rotation axis 5 in a circumferential direction. The helical springs 26 are supported at their ends on the input component 2 in a circumferential direction (not visible). In the other direction, a helical spring 26 is supported on the flange wing 27 of the output flange 18″. The input component 6 and the cover 28 together define an annular chamber 20 in which the helical spring 26 is housed. The input component 6 has a plurality of through holes 7 distributed around the axis of rotation 5. An angle ring 42 with an axially through screw hole 32 rests axially against the input component 6. A compensating washer 43 with a cylindrical hole 44 rests against the primary side of the input component 6. The inner cylindrical hole 44, the through holes 7, and the screw hole 32 are equidistant from the axis of rotation 5. The holes are of the same size, such that, in the position selected by the oscillation of the input component 2 relative to the output component 41, one of the through holes 7 is axially aligned with one of the screw holes 32 and one of the inner cylindrical holes 44, respectively, i.e., their centerlines coincide with each other and are equidistant from the axis of rotation 5.

[0030] The output assembly 41 includes a hub flange 8″ primarily formed by thermoforming and at least one output flange 18″ rigidly connected to the hub flange 8″ by means of rivets 9. The hub flange 8″ has a hub 45 for connection to a clutch or gearbox (not shown). The hub 45 extends into a connecting section 46 that connects the hub 45 to a rivet flange 47. The connecting section 46 has axially through entry holes 48 and is rotatable relative to the input component 6 about a rotation axis 5, such that each entry hole 14, together with one of the screw holes 32, is axially aligned with one of the through holes 7.

[0031] The corresponding through hole 7 is constructed as an inner cylinder. The inlet hole 48 has an inner contour that deviates from a circle, wherein the radially lower arc segment 48a of the inlet hole 48 is an inner cylinder.

[0032] Figure 3 and Figure 4 - A portion 35 of the sealing ring / friction ring 50 extends radially inward beyond the contact area 13 and is axially opposed to a groove 49 formed in the hub flange 8″. The groove 49 connects to the contact area 13 radially below and radially above the respective inlet holes 48 such that the inlet holes 48 are in fluid communication with each other radially outward on the edge side through the groove 49. A circumferential collection groove 51 is formed between the portion 35 and the groove 49.

[0033] Figure 7 - The inlet hole 48 has an inner profile that deviates from the shape of an inner cylinder, wherein the radial first internal dimension A of each inlet hole 48 is greater than the tangentially oriented second internal dimension B of each inlet hole 48.

[0034] Figure 4 and Figure 7 - The groove 49 is a circumferential groove that connects to the inlet hole 48 on the radially outer side, and its radially inner edge transitions at the radially outer edge 52 formed in each inlet hole 48 to the radially outer upper edge of the inlet hole 48.

[0035] List of reference numerals 1. Torsional vibration damper 2 Input Components 3 Output Components 4 Torsional vibration damper 5. Rotation axis 6 Input Components 7 Through holes 8 First flange 8′ Hub flange 8″ hub flange 9 Rivets 10 Flange connection 11. Wheel hub flange section 12. Disc-shaped component section 13 Contact Area 13′ Contact area 14. Entering hole 14a Circular arc segment / inner cylindrical segment 15. Ring-shaped components 15′ Ring component 16 slots The arc-shaped section of groove 16a 17 Compression Spring 18 Second Flange 18′ Output flange 18″ Output flange 19. Sealing ring / friction ring 20 Annular Chambers 21 Riveting connection 22 Rivets twenty three - 24 Friction Ring 25 - 26. Coil spring 27 Flange Wing 28. Cover of the input component 29. The disc-shaped part of the output flange 30-inch wheels 31. Corner Ring 32 Screw holes 33. Liquid collection tank 34. Centerline of the through hole 35. Part of the ring-shaped component 36 Connecting Section 37 Disc Spring 38 internal teeth 39 Riveted flange 39a Rivet Hole 40 Torsional Vibration Damper 41 Output Components 42 Corner Rings 43 Compensating Washers 44 Inner cylindrical hole 45 rims 46 Connecting Section 47. Riveted flange 48. Entry Hole 48a Circular arc segment 49 slots 50 Sealing ring / friction ring 51. Liquid collection tank 52 Edge A First Internal Dimension B Second internal dimension E Radial plane L-shaped hole R1 radius The starting point of radius P R Hole radius

Claims

1. A torsional vibration damper (1, 40) having an input component (2) and an output component (3, 41), wherein: The input component (2) and the output component (3, 41) are capable of limited relative oscillation about the axially oriented rotation axis (5) of at least one torsional vibration damper (4) under the resistance of an elastic spring. The input component (2) has an input part (6) with a plurality of through holes (7) distributed around the rotation axis (5). The output component (3, 41) consists of at least a first flange (8) and at least one second flange (18) in contact with the first flange (8). The first flange (8) has an axially penetrating inlet hole (14, 48). The first flange (8) and the input part (6) are capable of relative oscillation about the rotation axis (5) such that one of the through holes (7) and one of the inlet holes (14, 48) are respectively axially aligned with each other. An annular part (15, 15') is axially abutted on the axial side of at least one flange (8, 18) facing the input part (6). A first part (11) of one of the flanges (8, 18) and a second part (12) of the annular component (15, 15′) are in contact with each other and axially abut each other at a contact area (13, 13′), characterized in that at least one groove (16, 49) is formed on the first flange (8), wherein the groove (16, 49) is connected to the contact area (13, 13′) radially below the contact area (13, 13′) and is formed in the first flange (8) in an axially recessed manner, and the inlet holes (14, 48) are in fluid communication with each other through the groove (16, 49).

2. The torsional vibration damper (1) according to claim 1, characterized in that, The annular component (15) is a second flange (18), wherein the second flange (18) acts on at least one compression spring (17) of the torsional damper (4), and the second flange (18) is abutted against and rigidly connected to the first flange (8) at the contact area (13).

3. The torsional vibration damper (1) according to claim 1, characterized in that, The annular component (15′) is a sealing ring (19) and / or a friction ring (19), wherein the sealing ring (19) and / or the friction ring (19) press against one of the flanges (8, 18) at the contact area (13, 13′).

4. The torsional vibration damper (1) according to claim 1, characterized in that, The annular component (15) protrudes radially beyond the contact area (13, 13′) in the direction of the rotation axis (5), wherein the radial protrusion (35) of the annular component (15) and the contour of the groove (16, 49) define a radial collection groove (33, 51) disposed between the annular component (15) and the first flange (8) and restricted on both sides of the axial direction.

5. A torsional vibration damper (1) according to any one of claims 1, 2, 3 or 4, wherein the torsional vibration damper (4) has a plurality of compression springs (17) in an annular chamber (20), characterized in that, The contact area (13, 13′) begins at the groove (16, 49) and terminates at the annular chamber (20).

6. An output assembly (3, 41) for the torsional vibration damper (1, 40) of claim 1, characterized in that, The first flange (8) and the second flange (18) are connected to each other by means of a riveting connection (21), wherein a contact area (13) is formed in at least one radial plane (E) between the first flange (8) and the second flange (18), and is formed at least around the rivet (22) of the riveting connection (21).

7. A flange (8) of a torsional vibration damper (1, 40), which is a flange of the output assembly (3, 41) according to claim 6, or a flange of the torsional vibration damper (1, 40) according to any one of claims 1 to 5, having inlet holes (14, 48) distributed around its axis of symmetry consistent with the axis of rotation (5), characterized in that, The inlet holes (14, 48) have an inner contour that deviates from the shape of an inner cylinder, wherein the first radial internal dimension (A) of each inlet hole (14, 48) is greater than the second internal dimension (B) of each inlet hole (14, 48) oriented tangentially.

8. The flange (8) according to claim 7, characterized in that, The groove (16) is connected to the corresponding inlet hole (14).

9. The flange (8) according to claim 7 or 8, characterized in that, The groove (16) extends in the circumferential direction, wherein the extension path of the groove (16) is interrupted multiple times in the circumferential direction by the entry hole (14).

10. The flange (8) according to claim 7 or 8, characterized in that, The groove (49) is connected to the inlet hole (48) on the radially outer side.

Images