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

Abstract

The invention relates to a torsional vibration damper (1, 40) comprising an input assembly (2) and an output assembly (3, 41), in which torsional vibration damper the input assembly (2) and the output assembly (3, 41) can be pivoted relative to one another to a limited extent about an axially oriented axis of rotation (5) of the torsional vibration damper (1, 40) counter to spring-elastic resistances of at least one torsional vibration damper (4). The input assembly (2) has an input component (6) having a plurality of through-holes (7) distributed about the axis of rotation (5). The output assembly (3, 41) comprises at least one first flange (8) having access holes (14, 48) and at least one second flange (18) that contacts the first flange (8). According to the invention, a measure protecting the torsional vibration damper (4) from the ingress of a fluid is provided. The measure provides a groove (16, 49) on the first flange (8), which groove is coupled to the access holes (14, 48).

Description

[0001] Torsional vibration damper, output assembly and flange of a torsional vibration damper

[0002] Field of the invention

[0003] The invention relates to a torsional vibration damper according to the preamble of claim 1.

[0004] Background of the invention

[0005] Such a torsional vibration damper is known from DE 10 2020 112 350 A1.

[0006] Description of the invention

[0007] The object of the invention is to improve the tightness of a torsional vibration damper against the ingress of water.

[0008] The object is achieved by a torsional vibration damper according to claim 1.

[0009] At the contact zone, the ring component and one of the flanges lie directly against one another, touching one another. The ring component and the flange preferably touch one another axially flat at a contact zone lying in a radial plane. Alternatively, the contact zone also extends axially over several radial planes. One of the flanges, the first flange, is a secondary-side flange with a hub and is referred to below as the hub flange. The hub is a connecting element for connecting the torsional vibration damper to a vehicle clutch and / or a vehicle transmission. According to the invention, at least one groove is formed on the hub flange, which adjoins the contact zone radially below the contact zone in the circumferential direction. The groove is formed axially recessed in the hub flange. The access holes formed in the hub flange are fluidly connected to one another by the groove.This advantageously ensures that water guided into the area by centrifugal force is guided via the groove to the access holes and via access holes to the outside and away from the contact zone.

[0010] Embodiments of the invention provide that the annular component is the second flange, referred to below as the output flange. Alternatively, the annular component is a seal or friction ring. The output flange preferably has radially projecting flange wings, each of which engages at least one arcuate compression spring. The compression spring is / are preferably one or more coil springs of the torsional vibration damper.

[0011] A further embodiment of the invention provides that the annular component protrudes radially inward from the contact zone in the direction of the rotational axis beyond the contact zone. The protruding part is preferably a disc section extending around the rotational axis, which is axially opposite the groove formed in the hub flange. This advantageously creates a collecting channel between the protruding part and the groove, in which the fluid is collected and from which it can flow via the groove to the access holes and from there to the outside.

[0012] The invention is particularly suitable for torsional vibration dampers in which the torsional vibration damper comprises several compression springs. The compression springs are housed in an annular chamber extending around the axis of rotation. Because the contact zone between the output flange and the annular component in such arrangements begins radially inward at the groove and ends radially outward at the annular chamber, the inventive measure ensures that no water can creep through the contact zone into the annular chamber, which is usually filled with grease.

[0013] The invention further provides an output assembly for a torsional vibration damper, in which the hub flange and the output flange are advantageously connected to one another by means of riveted joints to form a preassembled unit of a secondary assembly. The contact zone between the hub flange and the output flange is formed in a radial plane at least around the rivets of the riveted joint.

[0014] Finally, the invention provides a hub flange which is disc-shaped and preferably manufactured from sheet metal by cold forming and stamping. The access holes distributed around its axis of symmetry have an inner contour that deviates from an inner cylindrical shape. As a result, the access holes extend radially to the groove or radially beyond the groove. The inner contour of the access holes extends radially beyond the groove so far that they are approximately at the radial height of the base of the collecting trough and / or the beginning of the contact zone. The radial inner dimensions of the access holes are larger in the radial direction than in the tangential direction. Where the respective access hole has been positioned so that they are aligned with the through hole, the tangential dimensions of the access hole are equal to or larger than the diameter of the through hole.The radial extension of the through hole provides the access holes with a dual function. Firstly, the access holes provide access to the screw connection between the primary side of the damper and a motor. This allows, for example, the screws and tool required for the screw connection to be passed through the access holes. Secondly, the access holes serve as drainage openings through which the water collected in the radially outer groove or collecting channel can be directed outward, away from the contact zone.

[0015] The groove formed in the hub flange can consist of groove sections, each of which is located between two of the access holes and opens into one of the access holes on either side. Alternatively, the groove is formed circumferentially. The edge of the groove is interrupted on one side towards the access holes at the level of the access holes, so that the groove intersects the edge of the respective access hole. The primary-side input assembly and the secondary-side output assembly can be pivoted relative to one another about a rotational axis of the torsional vibration damper against spring-elastic resistances of the torsional vibration damper, i.e., when pivoting, the torsional vibration damper forms spring-elastic operative connections in opposite circumferential directions about the rotational axis between the input assembly and the hub flange.The torsional vibration damper is preferably formed by several compression springs or compression spring packages distributed around the circumference of the rotation axis.

[0016] The ring component is, for example, a flange for a centrifugal pendulum absorber or an output flange with flange vanes. Alternatively, the ring component can also be a jaw of an overload clutch clamping the output flange. Combinations of the above arrangement are also conceivable. A rigid flange connection, e.g. between the output flange and the hub flange, is preferably formed by rivets and / or screws. A contact zone can be formed simultaneously or alternatively between the output flange / hub flange and / or a seal or a friction ring. In this contact zone, the seal ring and / or the friction ring are pressed against one of the flanges. In the contact zone, surfaces of two of the aforementioned components that are clamped against one another or rigidly connected to one another touch.

[0017] The hub flange can be pivoted relative to the input component about the rotation axis such that one of the through holes and one of the access holes are axially aligned. This requires that the hole patterns in the input component and on the output flange are identical in terms of their circumferential pitch and their radial distance from the rotation axis. This means that the respective through hole is axially opposite one of the access holes such that the through holes or the screw heads for tightening or loosening the input component are accessible via the access holes during assembly or disassembly.

[0018] The axis of symmetry of the hub flange lies on the axis of rotation of the output assembly, which corresponds to the axis of rotation of the torsional vibration damper. The contact zone is preferably formed as a flat surface in a radial plane traversed perpendicularly by the axis of rotation. Alternatively, the contact zone can also extend across multiple radial planes. "Circularly around the axis of rotation" means following the direction of a circular line of an imaginary circle lying in a radial plane. The center of the circle is traversed perpendicularly by the axis of rotation. "Fluidically" means permeable and conducting for fluids, preferably water.

[0019] The through hole is preferably cylindrical in shape. The access hole has an inner contour that deviates from a circular shape, with a radially lower section of the access hole being defined by a section with an inner cylindrical shape. The insertion point for the radius of the inner cylindrical section preferably lies on an imaginary axial extension of the center line of the through hole.

[0020] Description of the characters

[0021] The invention is explained below using exemplary embodiments. The drawings are not to scale. They show:

[0022] - Figure 1 shows a torsional vibration damper 1 in a sectional view along the axis of rotation 10 of the torsional vibration damper 1,

[0023] - Figure 2 shows the enlarged detail X of the torsional vibration damper 1 described in Figure 1,

[0024] Figure 3 shows a further embodiment of a torsional vibration damper 40 in a sectional view along the axis of rotation 5 of the torsional vibration damper 41,

[0025] Figure 4 shows the detail Y from Figure 3 enlarged, Figure 5 shows a hub flange 8' as a single part,

[0026] - Figure 6 is an enlarged view of the detail Z marked in Figure 5 with the course of the groove 16,

[0027] - Figure 7 is a further enlarged view of detail Z marked in Figure 5 with an alternative course of an alternative design of a groove 49.

[0028] Figure 1 shows a torsional vibration damper 1, 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 a housing-like input component 6 with a cover 28. The output assembly 3 is formed from a first flange 8 designed as a hub flange 8' and a second flange 18 designed as an output flange 18'.

[0029] In this example, the annular component 15 is the output flange 18', which rests against the ends of coil springs 26 with flange wings 27. The hub flange 8' and the output flange 18' are rigidly connected to one another by rivets 9 and rest firmly against one another at a contact zone 13. Another contact zone 13' is formed axially between another annular component 15' and the second flange 18. The annular component 15' is a sealing ring / friction ring 19, which is clamped axially between the input component 6 and the output flange 18' and centered on an angle ring 31.

[0030] The input assembly 2 and the output assembly 3 can be pivoted relative to one another to a limited extent around an axially aligned axis of rotation 5 of the torsional vibration damper 1, against the spring-elastic resistance of a torsional vibration damper 4. The torsional vibration damper 4 is formed from a plurality of coil springs 26 arranged in an arc around the circumference of the rotation axis 5. The coil springs 26 are supported in one circumferential direction by their end on the input assembly 2 (not visible in the illustration). In the other direction, the coil springs 26 are supported on a flange wing 27 of the output flange 18'. The input component 6, with the cover 28, delimits an annular chamber 20 in which the coil springs 26 are accommodated. The input component 6 is provided with a plurality of through-holes 7 distributed around the rotation axis 5. An angle ring 31 is axially attached to the input component 6 and is provided with axially through screw holes 32.The through holes 7 and the screw holes 32 have equal distances R from the rotation axis 5, which correspond to the radius R of the hole circles on which the holes lie. The hole circles are the same size, so that one of the through holes 7 is axially aligned with one of the screw holes 32 after pivoting - i.e., their center lines lie on top of one another and have the same distance R from the rotation axis 5.

[0031] The output assembly 3 consists of a hub flange 8' and at least one annular component 15 in the form of the output flange 18', which is rigidly connected to the hub flange 8' via rivets 9. The hub flange 8' is provided with a hub 30, which is intended for connection to a clutch or gearbox (not shown). The hub 30 continues in a connecting section 36, which connects the hub 30 to a rivet hole flange 39. The connecting section 36 has axially through-passage holes 14 and is pivotable relative to the input component 6 about the rotation axis 5 such that each of the access holes 14, together with one of the screw holes 32, is axially aligned with one of the through-passage holes 7.

[0032] The respective through-hole 7 is formed with an internal cylinder. The access hole 14 has an inner contour that deviates from a circular shape, with a radially lower circular arc section 14a of the access hole 14 being internally cylindrical. The insertion point P for the radius R1 of the circular arc section 14a preferably lies on an imaginary axial extension of the center line 34 of the through-hole 7. The distance R of the center line 34 of the respective through-hole 7 to the axis of rotation 5 is equal to the distance of the insertion point P for a radius R1 of the circular arc section 14a to the axis of rotation 5. The distance R is also the radius of the two hole circles that are of equal size to the axis of rotation 5 and on which the through-holes 7 and access holes 14 are located. Figure 2 - The annular component 15 bears axially against a side of the hub flange 8' axially facing the input component 6.The first section 11 of the hub flange 8' and a second section 12 of the ring component 15 lie closely against one another, touching each other at a contact zone 13 extending in the imaginary radial plane E. The contact zone 13 begins radially below the rivet 9 and extends from there to radially below a sealing friction ring 24. The friction ring 24 is held radially on the cover 28 of the input component 6 but is preloaded axially against the output flange 18' by means of a disc spring 37 for limited axial movement.

[0033] Advantageously, a collecting channel 33 is formed between the disc section 29 and the groove 16, in which the fluid is collected and from which it is guided via the groove 16 to the access holes 14, from where it can flow out. The groove 16 opens into the access hole 14. Furthermore, a further contact zone 13' extends between a further annular component 15', designed as a sealing and / or friction ring 19, and the output flange 18'. The further annular component 15' is a sealing ring / friction ring 19, which is clamped axially between the input component 6 and the output flange 18' and guided radially on the angle ring 31. The contact zone 13' extends to the edge of the annular chamber 20.

[0034] Figure 5 - Figure 5 shows an embodiment of the hub flange 8', which is manufactured from sheet metal by cold forming and stamping. The hub flange 8' is cup-shaped and has the hub 30 at the bottom of the cup, on which an internal toothing 38 is formed for a shaft-hub connection (not shown). The edge of the cup is formed by a rivet-hole flange 39 with rivet holes 39a. The rivet-hole flange 39 and the hub 30 are connected to one another via the connecting section 36. The connecting section 36 is provided with access holes 14, which have an inner contour that deviates from a circular shape. However, each of the access holes 14 is described with an inner cylindrical circular arc section 14a or inner cylinder section 14a which adjoins the hole circle L radially inwards and is defined by a radius R1, as is described in Figure 5 using an example representative of all access holes 14.The insertion point P of the radius R1 lies on the hole circle L of the access holes 14 running around the rotation axis 5, which also lies on the hole circles of the through holes 7 and the screw holes 32 (see Fig. 1 ).

[0035] Figure 6 - The groove 16 is circumferentially interrupted by the access holes 14. As a result, the groove 16 is divided into several arcuate sections 16a extending from one of the access holes 14 to the other. Each end of the arcuate sections 16a opens into an access hole 14 of two circumferentially adjacent access holes 14.

[0036] Figure 3 shows a torsional vibration damper 40, 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 a housing-like input component 6 with a cover 28. The output assembly 41 is formed from a first flange 8 designed as a hub flange 8" and a second flange 18 designed as an output flange 18".

[0037] The output flange 18" rests with flange wings 27 on the ends of coil springs 26. The hub flange 8" and the output flange 18" are rigidly connected to one another by rivets 9 and lie firmly against one another. A contact zone 13 is formed axially between a ring component 15 and the second flange 18. The ring component 15 is a sealing ring / friction ring 50, which sits on the angle ring 42 and is clamped axially between the input component 6 or the angle ring 42 and the hub flange 8" and is pressed against the output flange 18" at the contact zone 13.

[0038] The input assembly 2 and the output assembly 41 can pivot relative to each other to a limited extent around an axially aligned rotational axis 5 of the torsional vibration damper 40, against the spring-elastic resistance of a torsional vibration damper 4. The torsional vibration damper 4 is formed from several coil springs 26 arranged in an arc around the circumference of the rotational axis 5. The coil springs 26 are supported in one circumferential direction by their ends on the input assembly 2 (not visible). In the other direction, the coil springs 26 are supported on a flange wing 27 of the output flange 18". The input component 6, with the cover 28, defines an annular chamber 20 in which the coil springs 26 are accommodated. The input component 6 is provided with several through holes 7 distributed around the rotation axis 5. An angle ring 42, which is provided with axially through screw holes 32, rests axially against the input component 6.On the primary side of the input part 6 there is a shim 43 which has a cylindrical hole 44. The inner cylindrical hole 44, the through holes 7 and the screw holes 32 are at equal distances from the axis of rotation 5. The hole circles are the same size so that one of the through holes 7 is axially aligned with one of the screw holes 32 and one of the inner cylindrical holes 44 in a position selected by pivoting the input assembly 2 against the output assembly 41 - ie their center lines lie on top of one another and are at the same distance from the axis of rotation 5.

[0039] The output assembly 41 is provided with a hub flange 8" formed primarily by hot forming and at least one output flange 18" rigidly connected to the hub flange 8" via rivets 9. The hub flange 8" is provided with a hub 45, which is intended for connection to a clutch or gearbox (not shown). The hub 45 continues in a connecting section 46, which connects the hub 45 to a rivet hole flange 47. The connecting section 46 has axially through access holes 48 and is pivotable relative to the input component 6 about the rotation axis 5 such that each of the access holes 14, together with one of the screw holes 32, is axially aligned with one of the through holes 7.

[0040] The respective through-hole 7 is formed with an internal cylindrical shape. The access hole 48 has an inner contour that deviates from a circular shape, with a radially lower circular arc section 48a of the access hole 48 being internally cylindrical.

[0041] Figures 3 and 4 - A portion 35 of the sealing ring / friction ring 50 extends radially inward beyond the contact zone 13 and lies axially opposite the groove 49 formed in the 8" hub flange. The groove 49 adjoins the contact zone 13 radially below the contact zone 13 and radially above the respective access hole 48 such that the access holes 48 are fluidically interconnected at the radially outward edge by the groove 49. A circumferential collecting channel 51 is formed between the portion 35 and the groove 49.

[0042] Figure 7 - The access holes 48 have an inner contour deviating from an inner cylindrical shape, wherein a radial first inner dimension A of the respective access hole 48 is larger than a tangentially oriented second inner dimension B of the respective access hole 48.

[0043] Figure 4 and Figure 7 - The groove 49 is a circumferential groove which adjoins the access holes 48 radially on the outside and whose radially inner edge merges into the radially outer upper edge of the access holes 48 at an edge 52 formed radially on the outside of the respective access hole 48.

[0044] List of reference symbols

[0045] Torsional vibration damper

[0046] Input module

[0047] Output module

[0048] Torsional vibration damper

[0049] axis of rotation

[0050] Input component

[0051] Through hole first flange ' hub flange “ hub flange

[0052] Rivet 0 Flange connection 1 Section of the hub flange 2 Section of the disc element 3 Contact zone 3' Contact zone 4 Access hole 4a Circular arc section / inner cylinder section 5 Ring component 5' Ring component 6 Groove 6a Arc sections of the groove 7 Compression spring 8 Second flange 8' Output flange 8" Output flange 9 Sealing ring / friction ring 0 Ring chamber 1 Rivet connection 2 Rivet Friction ring

[0053] coil spring

[0054] Flange wing

[0055] Cover of the input component

[0056] Disc section of the output flange

[0057] hub

[0058] Angle ring

[0059] screw holes

[0060] collecting trough

[0061] Centerline of the through hole

[0062] Share of the ring component

[0063] connecting section

[0064] Disc spring

[0065] Internal gearing

[0066] rivet hole flange a rivet hole

[0067] Torsional vibration damper

[0068] Output module

[0069] Angle ring

[0070] Shim with internal cylindrical hole

[0071] hub

[0072] connecting section

[0073] rivet hole flange

[0074] Access hole a circular arc section

[0075] Nut

[0076] Sealing ring / friction ring

[0077] collecting trough

[0078] Edge A first inner dimension R1 radius

[0079] B second inner dimension P insertion point of the radius

[0080] E Radial plane R Radius of the bolt circle

[0081] L bolt circle

Claims

Patent claims 1. Torsional vibration damper (1, 40) with an input assembly (2) and an output assembly (3, 41), wherein: - the input assembly (2) and the output assembly (3, 41) can be pivoted relative to one another to a limited extent against spring-elastic resistances of at least one torsional vibration damper (4) about an axially aligned axis of rotation (5) of the torsional vibration damper (1, 40), - the input assembly (2) has an input component (6) with a plurality of through holes (7) distributed around the axis of rotation (5), - the output assembly (3, 41) is formed from at least a first flange (8) and at least one second flange (18) touching the first flange (8), - the first flange (8) is provided with axially through access holes (14, 48), - the first flange (8) and the input component (6) are pivotable relative to one another about the rotational axis (5) in such a way that one of the through holes (7) and one of the access holes (14, 48) are axially aligned with one another, - an annular component (15, 15') axially bears against at least one of the flanges (8, 18) on a side axially facing the input component (6), - a first section (11) of one of the flanges (8, 18) and a second section (12) of the ring component (15, 15') lie axially against one another in contact at a contact zone (13, 13'), characterized in that at least one groove (16, 49) is formed on the first flange (8), wherein the groove (16, 49) adjoins the contact zone (13, 13') radially below the contact zone (13, 13') and is formed axially recessed in the first flange (8), and in that the access holes (14, 48) are fluidically connected to one another by the groove (16, 49).

2. Torsional vibration damper (1) according to claim 1, characterized in that the annular component (15) is the second flange (18), wherein the second flange (18) engages at least one compression spring (17) of the torsional vibration damper (4), and wherein the second flange (18) is rigidly connected to the first flange (8) in contact with the contact zone (13).

3. 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 friction ring (19) is pressed against one of the flanges (8, 18) at the contact zone (13, 13').

4. Torsional vibration damper (1) according to claim 1, characterized in that the annular component (15) projects radially beyond the contact zone (13, 13') in the direction of the axis of rotation (5), wherein the portion (35) of the annular component (15) projecting radially in the direction of the axis of rotation (5) and a contour of the groove (16, 49) delimit a radial collecting groove (33, 51) formed between the annular component (15) and the first flange (8) and axially delimited on both sides.

5. Torsional vibration damper (1), in which the torsional vibration damper (4) has a plurality of compression springs (17) in an annular chamber (20), according to one of the preceding claims 1, 2, 3 or 4, characterized in that the contact zone (13, 13') begins at the groove (16, 49) and ends at the annular chamber (20).

6. Output assembly (3, 41) for a torsional vibration damper (1, 40) according to claim 1, characterized in that the first flange (8) and the second flange (18) are connected to one another by means of riveted connections (21), wherein the contact zone (13) is formed in at least one radial plane (E) between the first flange (8) and the second flange (18) at least around rivets (22) of the riveted connection (21).

7. Flange (8) of a torsional vibration damper (1, 40) of an output assembly (3, 41) according to claim 6 or of a torsional vibration damper (1, 40) according to one of the preceding claims 1 to 5, which has the access holes (14, 48) distributed around its axis of symmetry coinciding with the axis of rotation 5, characterized in that the access holes (14, 48) have an inner contour deviating from an inner cylindrical shape, wherein a radial first inner dimension (A) of the respective access hole (14, 48) is larger than a tangentially oriented second inner dimension (B) of the respective access hole (14, 48).

8. Flange (8) according to claim 7, characterized in that the groove (16) opens into the respective access hole (14).

9. Flange (8) according to claim 7 or 8, characterized in that the groove (16) extends circumferentially, wherein the course of the groove (16) in the circumferential direction is interrupted several times by the access holes (14).

10. Flange (8) according to claim 7 or 8, characterized in that the groove (49) is connected radially to the outside of the access holes (48).

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