DE102020127093B3 - Pulley decoupler with a carrier plate of a vibration absorber supported on a centering piece - Google Patents

Abstract

The invention relates to a belt pulley decoupler (1) for a motor vehicle drive train, having a hub component (2) designed to be attached to a crankshaft of an internal combustion engine, a traction element disk (3) supported in a spring-damped manner relative to the hub component (2), and a vibration damper (4), the Vibration absorber (4) has a carrier plate (5) and this carrier plate (5) extends radially outwards from a plate section (19) supported axially on the hub component (2) to a collar region (8) accommodating at least one mass body (7), and the carrier plate (5) forming a sleeve area (6) radially outside the plate section (19) and radially inside at least one spring element (9) supporting the hub component (2) relative to the traction mechanism disc (3), which sleeve area (6) has an interference fit (21) on a centering piece (18) attached to the hub component (2).

Description

The invention relates to a pulley decoupler for a motor vehicle drive train, e.g. H. a drive train of a motor vehicle, with a hub component designed for (preferably direct) attachment to a crankshaft of an internal combustion engine, a traction mechanism disk supported in a spring-damped manner relative to the hub component, and a vibration absorber, the vibration absorber having a support plate and this support plate extending from a hub component ( directly or indirectly) supported plate section extends radially outwards to a collar area receiving at least one mass body.

A generic pulley decoupler 1' known from the prior art is, for example, DE 10 2011 086 093 A1 to be taken and is in the 3 and 4 shown. It is clear from these figures that previously when assembling the belt pulley decoupler 1' on the internal combustion engine, a separately manufactured counterholder G was kept available, via which a counterholder tool was used to set a rotational alignment of a vibration absorber 4' relative to a hub component 2' of the belt pulley decoupler 1'. For this purpose, the counter-holder G is attached to the support plate 5' by means of a riveted connection N. However, it turned out that this connection of the separate counter-holder G has a negative influence on the maximum torque that can be transmitted.

A belt pulley decoupler is known from publication US 2019/0 063 546 A1, in which a carrier plate of the vibration absorber is held by means of a press fit on a centering piece attached to a hub component.

The documents DE 43 22 710 A1 and JP 2011 - 220 389 A disclose pulley decouplers with a press fit which respectively connects the hub to the traction pulley.

It is therefore the object of the present invention to provide a belt pulley decoupler that is easier to manufacture and assemble and has the most robust construction possible.

According to the invention, this is achieved in that the carrier plate forms a sleeve area radially outside the plate section and radially inside at least one spring element supporting the hub component relative to the traction mechanism disk, which sleeve area is held by a press fit on a centering piece attached to the hub component.

As a result, the carrier plate and the hub component are easily assembled and at the same time connected to one another as robustly as possible. In particular, a fastening force that takes place during operation is supported as directly as possible by a central screw.

That interference fit is understood in particular to mean a connection which ensures that the support plate resists the external forces acting during transport of the assembled belt pulley decoupler and before final assembly on the crankshaft and remains connected to the hub component. During the final assembly of the belt pulley decoupler on the crankshaft, a central screw then preferably assumes the fastening function of the hub component and the support plate on the crankshaft.

Further advantageous embodiments are claimed with the dependent claims and explained in more detail below.

Accordingly, it is also advantageous if the centering piece is ring-shaped and is pushed radially from the outside onto the sleeve area. As a result, the centering piece is designed to be as stable as possible and can be easily connected to the carrier plate.

If the centering piece is connected by means of a rivet connection to a main body of the hub component that supports the traction mechanism disk, it is accommodated using means that are already available. This keeps the structure as simple as possible.

In this regard, it is also expedient if the hub component also has a flange part that is supported directly on the at least one spring element, the main body and the flange part being connected to one another by means of the rivet connection. This also further simplifies the structure.

This positive effect is further intensified if a friction device is effectively inserted between the hub component and the traction disk, the friction device having a friction ring in frictional contact with the traction disk and a disk spring pressing the friction ring against the traction disk, and the disk spring also using the rivet connection is received on the hub component.

It is also advantageous if the support plate forms a planar support area radially outside of the sleeve area, spaced axially from the hub component and having at least one locking bore. A support area is thus provided for receiving a counter-holding tool, which is already formed integrally/in one piece of material with the carrier plate. This avoids the separate manufacture of a separate counter-holder.

It is also expedient if the sleeve area is/are provided with a surface structure, such as ribbing or knurling, or teeth on its support surface contacting the centering piece and/or the centering piece on its counter-support surface contacting the sleeve area.

The assembly of the vibration absorber on the hub component is further simplified if the hub component has a through-hole that completely penetrates it radially at the height of the support area of the carrier plate. This makes it possible to fix the carrier plate and the hub component directly relative to one another in the direction of rotation.

Furthermore, it is expedient if the through hole is arranged at the same radial height as the at least one pegging hole. Then the hub component and the carrier plate can be fixed directly to one another by means of a single mounting pin. It is also advantageous in this respect to design the pegging bore and the through hole with the same diameter, at least in sections. According to further embodiments, the through-hole can also be designed with a different, preferably smaller, diameter than the pegging bore. If the through-hole is implemented in a stepped manner, a stop for the mounting pin is simply implemented.

Furthermore, it is advantageous if the carrier plate is supported at least in sections directly and/or at least in sections indirectly via an intermediate piece on the main body of the hub component. This allows a screw clamping length to be set individually.

The connection between the carrier plate and the flange part is further strengthened if a wart projected on the carrier plate (preferably on the plate section) is accommodated in a recess of the flange part, preferably pressed into this recess.

In other words, according to the invention, a special centering of a torsional vibration damper (vibration absorber) is implemented via a retaining plate (centering piece) on a pulley decoupler without riveting. The inner circumference of the primary plate is clamped by a central screw in a mounted state on the internal combustion engine side and centered by means of a centering piece (piece of waste from a cover of the belt pulley decoupler) and held by pressing. The inner diameter of the centering piece can be toothed, ribbed or profiled if required. The screw clamp length can be varied by changing the length of the spacer. The disk spring is held flat by the centering piece, which prevents rippling and leakage.

The invention will now be explained in more detail below with reference to figures, in which connection different exemplary embodiments are also described.

• 1 eine Längsschnittdarstellung eines erfindungsgemäßen Riemenscheibenentkopplers nach einem ersten Ausführungsbeispiel, wobei der Gesamtaufbau des Riemenscheibenentkopplers gut zu erkennen ist,
• 2 eine Längsschnittdarstellung eines Detailbereiches eines erfindungsgemäßen Riemenscheibenentkopplers nach einem zweiten Ausführungsbeispiel, wobei sich ein Trägerblech nun nicht mehr, wie in 1 direkt in Anlage mit einem Hauptkörper eines Nabenbestandteils befindet, sondern indirekt über ein Zwischenstück an diesem Hauptkörper abgestützt ist,
• 3 eine Längsschnittdarstellung eines aus dem Stand der Technik bereits bekannten Riemenscheibenentkopplers, sowie
• 4 eine perspektivische Darstellung des aus dem Stand der Technik bekannten Riemenscheibenentkopplers nach 3 in einer Vollansicht.

Show it:

• 1 a longitudinal sectional view of a pulley decoupler according to the invention according to a first embodiment, the overall structure of the pulley decoupler being clearly visible,
• 2 a longitudinal sectional view of a detail area of a belt pulley decoupler according to the invention according to a second embodiment, with a carrier plate now no longer moving, as in 1 is directly in contact with a main body of a hub component, but indirectly supported on this main body via an intermediate piece,
• 3 a longitudinal sectional view of a pulley decoupler already known from the prior art, and
• 4 1 is a perspective view of the prior art pulley decoupler 3 in a full view.

The figures are only of a schematic nature and therefore only serve to understand the invention. The same elements are provided with the same reference numbers.

With 1 1 is a belt pulley decoupler 1 according to the invention, designed according to a first exemplary embodiment, which can be seen clearly in terms of its overall structure. The pulley decoupler 1 typically comprises a pulley 3 which, in use, is rotationally connected to an endless traction means, namely a belt. This pulley 3 can be rotated relatively on a main body 12 of a hub component 2 supported / stored. For this purpose, the main body 12 has a bearing 35 on an axial projection 34, which supports the pulley 3 towards the radial inside.

It should be pointed out in general that the directional information used here in the axial, radial and circumferential direction relates to a central axis of rotation 45 of the belt pulley decoupler 1 . The term axial/axial direction means a direction along/parallel to the axis of rotation 45, the term radial/radial direction means a direction perpendicular to the axis of rotation 45 and the circumferential direction means a direction along an imaginary circular line running concentrically to the axis of rotation 45.

Furthermore, the hub component 2 has a flange part 13 which is firmly connected to the main body 12 via a rivet connection 14 . In 1 a riveted connection 14 with forming rivet bolt 15 can be seen in section. A plurality of these riveted bolts 15 for implementing the riveted joint 14 are distributed in the circumferential direction.

Towards a radial outside of the projection 34 , the flange part 13 is resiliently supported relative to the pulley 3 via a plurality of spring elements 9 distributed in the circumferential direction. The spring elements 9 allow the flexible disk 3 to be twisted elastically relative to the hub component 2 by a certain twisting angle range. A peripheral first end of the respective spring element 9 is directly in contact with the flange part 13; a peripheral second end of the respective spring element 9 is in direct contact with the pulley 3 . Those spring elements 9 are implemented as compression springs, more preferably as arc springs or as straight compression springs.

Furthermore, it is off 1 It can be seen that the riveted bolt 15 / the riveted joint 14 also includes a friction device 20 . The friction device 20 has a friction ring 36 and a disk spring 37 that presses this friction ring 36 axially against the traction mechanism disk 3 . The disk spring 37 is also fixed to the hub component 2 by means of the rivet bolt 15 / the rivet connection 14 .

A centering piece 18 used according to the invention, as described in more detail below, serves to support the disk spring 37. The disk spring 37 is held/clamped axially between the centering piece 18 and the flange part 13 in the region of the rivet connection 14. The friction ring 36, which is thus also accommodated on the hub component 2 and is pressed into frictional contact by means of the disc spring 37 against the traction disk 3, results in a spring-damped support of the traction disk 3 relative to the hub component 2.

Furthermore, a vibration damper 4 is attached to the hub component 2 . In this embodiment, this vibration damper 4 is designed as a so-called elastomer damper; in other versions, however, can also be realized in other ways. The vibration damper 4 always has a carrier plate 5 which is attached to the hub component 2 .

For axial support on the hub component 2 , the support plate 5 has a plate section 19 that runs exclusively radially toward its radial inner side. In the first exemplary embodiment, the plate section 19 is located directly axially in planar contact with an axial side of the main body 12.

From the plate section 19 , the carrier plate 5 merges into an axially running sleeve area 6 . The sleeve area 6 forms an axial projection of the support plate 5 and is connected to the centering piece 18 .

In this context it should be noted that the sleeve area 6, as realized in this embodiment, is fixed by means of a press fit 21 on a radial inner side 27 of the centering piece 18, namely on an axially running cup area 25 of the centering piece 18. In this regard, it should be pointed out that this results in a non-positive connection of the carrier plate 5 with the hub component 2 .

As in 1 also indicated, in this embodiment a surface structure 24 is formed on the centering piece 18 on the part of a support surface 22 of the sleeve region 6 and a counter-support surface 23 directly in contact with the support surface 22 . This surface structuring 24 is designed, for example, as knurled teeth/knurling or corrugation. A toothing is therefore preferably implemented on each component of the interference fit 21 , ie both on the support surface 22 and on the counter-support surface 23 , via which the carrier plate 5 is also held relative to the hub component 2 . At the same time as the non-positive connection, a positive connection between the carrier plate 5 and the centering piece 18 is therefore also implemented as a function of the connection forces in the interference fit 21 .

From the sleeve area 6, the carrier plate 5 runs further outwards in the radial direction, towards its collar area 8, which accommodates a mass body 7. The collar area 8, which at the same time forms the radial outside of the entire carrier plate 5, consequently serves to accommodate the mass body 7 converting an absorber mass. The vibration absorber 4 is therefore listed as an elastomer absorber.

Furthermore, a (plate-shaped) support area 10 extending exclusively in the radial direction is provided radially outside the plate section 19 and the sleeve area 6 and radially inside the collar area 8 and at an axial distance from the hub component 2 . That support area 10 is located approximately axially in the center of the mass body 7. The support area 10 is consequently arranged centrally between the end faces 44a, 44b of the mass body 7 that face away from one another. The support area 10 is also arranged radially inside the spring elements 9 .

The support area 10 has at least one, preferably a plurality of locking bores 11 distributed in the circumferential direction, such as in 1 hinted at. The carrier plate 5 can be supported in a desired rotational position relative to the hub component 2 by the respective locking bore 11 when the belt pulley decoupler 1 is mounted on a crankshaft.

An additional positioning opening 40 is preferably formed on the main body 12, into which a counterholding tool can engage during assembly on the crankshaft side. With the help of this positioning opening 40 and the respective locking bore 11, the hub component 2 is supported relative to the carrier plate 5.

In connection with the details drawn in dashed lines, it should be pointed out that more preferably, instead of the positioning opening 40 on a radial outside of the main body 12 , the hub component 2 is also equipped with a through hole 32 at the radial height of the respective locking bore 11 . In this embodiment, that through hole 32 penetrates the hub component 2 completely, i.e. both the main body 12 and the flange part 13 as well as the centering piece 18. If the disc spring 37 is provided, this through hole 32 also penetrates the disc spring 37 axially.

Furthermore, it should be pointed out that the locking bore 11 and the through hole 32 are positioned radially at the same height. The through hole 32 is more preferably either, as in 1 converted, designed with a constant diameter, or alternatively designed as a stepped bore, with those sections of the through hole 32, as provided in the flange part 13 and in the centering piece 18 and the plate spring 37, having a larger diameter than one introduced in the main body 12 Section.

The centering piece 18 therefore preferably has both the function of accommodating the carrier plate 5 on the hub component 2 and the function of supporting the disc spring 37 on the hub component 2 . The centering piece 18 is formed from sheet metal.

According to the invention, torque during operation is consequently conducted without additional friction-increasing measures in each joint from the central screw 47 to the disk area 33, which preferably has a Hirth toothing on its axial side facing away from the vibration absorber 4. This is achieved in that the torque is transferred to the flange part 13 and the main body 12 via the carrier plate 5 together with the sleeve area 6 and the plate section 19 . In addition, the torque flow is divided in a non-positive manner (clamping force of the centering screw 47 and the interference fit 21) and more preferably in a positive manner (rivet bosses, not shown for the sake of clarity, and the rivet connection 14 of the flange part 13 and the main body 12).

With 2 A further preferred exemplary embodiment of the pulley decoupler 1 according to the invention can then be seen, the structure of the pulley decoupler 1 of the second exemplary embodiment corresponding to the structure of the first exemplary embodiment. For the sake of brevity, therefore, only the differences between these exemplary embodiments are described below.

With the second embodiment of the 2 It is indicated that an intermediate piece 16 accommodated axially between the main body 12 and the support plate 5 can be dimensioned as desired. The intermediate piece 16, which is preferably designed as a continuous, circumferential ring, is positioned in a receiving space 17, which is open radially inward, between the main body 12 and the carrier plate 5/the plate section 19. That receiving space 17 is delimited on a first axial side by the carrier plate 5 / the plate section 19, on a second axial side opposite this by a disk area 33 on the main body 12 and on a radial outside by an axial space between the disk area 33 and the Support plate 5 / flange part 13 extending wall area 43 of the main body 12.

while in 1 the carrier plate 5 / the plate section 19 is supported both directly on the intermediate piece 16 and on the main body 12, the carrier plate 5 / the plate section 19 is in 2 supported in the axial direction only indirectly via the intermediate piece 16 on the main body 12.

In other words, according to the invention, a primary plate (support plate 5) of a torsional vibration damper (vibration absorber 4) is to be clamped with its inner circumference (plate section 19) by the central screw 47 and by a centering piece 18, which comes as a waste piece from a cover of the belt pulley decoupler 1 center and hold by pressing.

The inner diameter of the centering piece 18 can be toothed, corrugated or profiled if required.

The screw clamping length can be varied by the length of the intermediate piece 16.

The disk spring is held flat by the centering piece 18; this prevents buckling and leakage.

Reference List

1

Pulley decoupler

2

hub component

3

pulley

4

vibration damper

5

support plate

6

sleeve area

7

mass body

8th

collar area

9

spring element

10

support area

11

staking hole

12

main body

13

flange part

14

rivet connection

15

rivet bolt

16

spacer

17

recording room

18

centering piece

19

plate section

20

friction device

21

press bandage

22

support surface

23

counter support surface

24

surface texturing

25

bowl area

27

inside

32

through hole

33

disk area

34

head Start

35

warehouse

36

friction ring

37

disc spring

39

elastomer layer

40

positioning hole

43

wall area

44a

first face

44b

second face

45

axis of rotation

47

central screw

Claims (10)

Pulley decoupler (1) for a motor vehicle drive train, with a hub component (2) designed to be attached to a crankshaft of an internal combustion engine, a traction mechanism disk (3) supported in a spring-damped manner relative to the hub component (2), and a vibration damper (4), the vibration damper (4) has a carrier plate (5) and this carrier plate (5) extends radially outwards from a plate section (19) supported axially on the hub component (2) to a collar area (8) accommodating at least one mass body (7), characterized in that the The carrier plate (5) forms a sleeve area (6) radially outside the plate section (19) and radially inside at least one spring element (9) supporting the hub component (2) relative to the traction mechanism disc (3), which sleeve area (6) has a press fit (21 ) on a centering piece (18) attached to the hub component (2). Pulley decoupler (1) after claim 1 , characterized in that the centering piece (18) is ring-shaped and is pushed radially from the outside onto the sleeve area (6). Pulley decoupler (1) after claim 1 or 2 , characterized in that the centering piece (18) is connected by means of a riveted connection (14) to a main body (12) of the hub component (2) supporting the pulley (3). Pulley decoupler (1) after claim 3 , characterized in that the hub component (2) also has a flange part (13) supported directly on the at least one spring element (9), the main body (12) and the flange part (13) being connected to one another by means of the rivet connection (14). Pulley decoupler (1) after claim 3 or 4 , characterized in that between the hub component (2) and the traction disk (3) a friction device (20) is effectively inserted, the friction device (20) having a friction ring (36) in frictional contact with the traction disk (3) and a friction ring (36) has a cup spring (37) pressing on the traction mechanism disc (3), and wherein the cup spring (37) is also held on the hub component (2) by means of the rivet connection (14). Pulley decoupler (1) according to one of Claims 1 until 5 , characterized in that the support plate (5) radially outside of the sleeve area (6) forms a planar support area (10) which is axially spaced from the hub component (2) and has at least one locking bore (11). Pulley decoupler (1) according to one of Claims 1 until 6 , characterized in that the sleeve area (6) is provided with a surface structure (24) on its support surface (22) contacting the centering piece (18) and/or the centering piece (18) on its counter-support surface (23) contacting the sleeve area (6). /is. Pulley decoupler (1) according to one of Claims 6 until 7 , characterized in that the hub component (2) radially at the level of the support area (10) of the carrier plate (5) has a through hole (32) that completely penetrates it. Pulley decoupler (1) after claim 8 , characterized in that the through hole (32) is arranged at the same radial height as the at least one locking bore (11). Pulley decoupler (1) according to one of claims 3 until 9 , characterized in that the support plate (5) is supported at least in sections directly and/or at least in sections indirectly via an intermediate piece (16) on the main body (12) of the hub component (2).

Images