DE102020100507A1 - Torsional vibration damper with torque limiter - Google Patents

Abstract

The invention relates to a torsional vibration damper (1) which is constructed as a dual-mass flywheel and which comprises a primary part (2) and a secondary part (3) which are arranged together so as to be rotatable about an axis of rotation (4) and rotatable relative to one another and between which in the torque flow a spring damper device (5) is arranged, the multi-part secondary part (3) including a torque limiter (12) designed as a slip clutch, the carrier flange (10) and drive plate (16) of which are connected via at least one friction lining (17, 18) The drive plate (16) is coupled to an output hub (11) and a centrifugal pendulum device (24) and the primary part (2) is screwed to a crankshaft of an internal combustion engine by means of screws (29) which pass through openings (36) in at least one component of the secondary part (3) can be used in bores (30) of the primary part (2). The output hub (11) is axially guided on a support disk (15) assigned to the carrier flange (10) and is positively connected to a drive disk (16) via a toothing (31), the toothing (31) being axially displaced by the output hub (11). at least one compression spring (34) can be released against the spring force and then the output hub (11) can be rotated to match the position of the openings (36) in the output hub (11) and the bores (30) of the primary part (2).

Description

The invention relates to a torsional vibration damper which is constructed as a two-mass flywheel and comprises a primary part and a secondary part, which are arranged together so as to be rotatable about an axis of rotation and rotatable relative to one another and between which a spring damper device is arranged in the torque flow, the multi-part secondary part being a slip clutch includes executed torque limiter and whose carrier flange and drive plate are connected via at least one friction lining and the drive plate is coupled to an output hub and a centrifugal pendulum device and the primary part is attached to a crankshaft of an internal combustion engine by means of screws, which through openings of at least one component of the secondary part in bores of the Primary part can be used.

In motor vehicles that are driven by internal combustion engines, a non-continuous torque in the form of torsional vibrations is transmitted to the drive train from the crankshaft due to the way the internal combustion engine works. To dampen the torsional vibrations, torsional vibration dampers constructed as dual mass flywheels (DMF) are known from the prior art. For example, the DE 10 2012 202 255 A1 a torsional vibration damper of this type which can be used for absorption or damping and which can be used in drive trains between the crankshaft of the internal combustion engine and, for example, a shift disconnect clutch upstream of the manual transmission.

To improve the isolation effect, the torsional vibration damper can be combined with a centrifugal pendulum device (CPP), which is preferably assigned to the secondary part and with which the vibration energy is damped by pivoting pendulum masses in opposite directions to the vibrations to be eliminated. Such centrifugal pendulum devices are for example from DE 10 2006 028 556 A1 and the DE 10 2009 042 836 A1 known, which include several circumferentially distributed bifilar pendulum masses or pendulum mass packages arranged on both sides of a carrier flange, movably arranged via step bolts guided in link or guide tracks.

Furthermore, torsional vibration dampers are often supplemented by a torque limiter (DMB), which in particular protects downstream components of the drive train, for example a transmission, from occurring torque peaks or limits the torque that can be transmitted by the torsional vibration damper. Such a torsional vibration damper is in the DE 10 2017 119 375 A1 disclosed. This comprises a primary part which is arranged to be rotatable about an axis of rotation and a secondary part which is arranged so as to be rotatable to a limited extent against the action of a spring damper device housed in an annular chamber of the primary part. Between a hub part of the secondary part and the spring damper device, a torque limiter is accommodated in an annular chamber together with the spring damper device.

In the DE 10 2014 217 853 A1 A torsional vibration damper constructed as a two-mass flywheel is shown, with a primary part that can be rotated about an axis of rotation and a secondary part that can be rotated relative to the latter against the action of a spring damper device about the axis of rotation, as well as a torque limiter connected in series with the spring damper device. In addition, a centrifugal pendulum device is arranged on the output side, the torque limiter and the centrifugal pendulum device forming structural units placed radially inside the dual-mass flywheel. The torque limiters, which act as a slip clutch, are often provided with an oil bath or otherwise lubricated, and these require an expensive seal.

A common structural design of the torsional vibration damper provides that the primary part is screwed on the drive side, the fastening screws being introduced both through openings in the secondary part and through bores in the primary part of the torsional vibration damper. During the initial assembly, the openings are aligned with the holes so that the fastening screws can be inserted unhindered. If, in the operating state, the torque limiter acting as a slip clutch is activated or triggered due to a set maximum torque being exceeded, a component of the secondary part rotates relative to the primary part of the torsional vibration damper. Associated with this, there is an offset between the openings and the bores, as a result of which, due to the lack of alignment, dismantling of the torsional vibration damper is not possible or requires great assembly effort.

It is the object of the present invention to create a structurally and / or functionally improved torsional vibration damper with an integrated torque limiter constructed as a slip clutch, which enables simple dismantling and assembly of the torsional vibration damper even after a torque limiter has been triggered.

The aforementioned object is achieved according to the invention by one of the features of the claim 1 enclosing torsional vibration damper released. Preferred embodiments of the invention are specified in the subclaims and the following description.

The inventive concept provides for a torsional vibration damper in which the output hub of the secondary part is axially guided on a support disk assigned to the carrier flange and is positively connected to the drive disk via a toothing. Against the spring force of at least one compression spring, the output hub is axially displaceable and detachable from the toothing and then rotatable to a limited extent. By rotating the output hub relative to the drive plate, a position match can be achieved in which the openings of the output hub are aligned with the bores in the primary part and the corresponding threaded bores of the crankshaft, which are intended for fastening screws of the torsional vibration damper.

The structural design enables the toothing to be released by pulling or axially displacing the output hub against a compression spring force, the tooth profile of which, in the operating state, locks positively into a counter-toothing of the drive plate in the torque-transmitting position. In a position axially removed from the support disk and offset from the toothing, the output hub can be rotated relative to the drive disk up to a position in which a matching position or an identical hole pattern is set between the openings of the output hub and the fastening screws with which the Torsional vibration damper is screwed to the crankshaft. By loosening the toothing there is the possibility, after a triggered or activated torque limiter, to bring the output hub or the secondary part into a position in which the openings of the output hub are aligned with the bores of the primary part.

After releasing, the loss of the axial force, the output hub moves automatically by the compression spring force into the starting position, in which the output hub is toothed in a torque-transmitting position with the drive plate. The twisted, changed position of the output hub enables unhindered access to the fastening screws through the openings in the output hub, which simplifies dismantling and reassembly of the torsional vibration damper. The toothing is separated by moving the secondary part from the primary part rigidly attached to the internal combustion engine, for example by pulling on the housing of the centrifugal pendulum device located upstream.

The invention decisively simplifies dismantling and reassembly of the torsional vibration damper. In previous secondary components that were screwed on, for example, a relative rotation of the output hub with respect to the fastening screws, due to a triggered or activated torque limiter, required a high level of installation effort or the use of special tools in order to bring the output hub back into a position that enables unhindered access to the screws. In contrast to this, with the concept according to the invention, the position of the output hub and the fastening screws can be matched by means of a simple measure that does not require a special tool.

In a preferred embodiment of the invention it is provided that the pressure springs supported on the primary part side on the drive plate in a circumferentially distributed manner each enclose a stepped bolt fixed in position in a housing of the centrifugal pendulum device. In order to enable relative rotation when a set torque of the torque limiter is exceeded, each stepped bolt in the drive plate is guided with play in a kidney-shaped curved slot. The elongated holes ensure that the step bolt including the compression spring can rotate almost unhindered in the circumferential direction of the torsional vibration damper. The length of the elongated holes is chosen so that the secondary side can be rotated until there is an alignment between the openings in the output hub and the fastening or crankshaft screws.

According to a further embodiment of the invention, the components of the secondary part, the carrier flange and a support disk, by means of cranked sections directed axially outward, delimit an inverted U-shaped, radially downwardly open drying space. The dry space formed by the interconnected, preferably riveted components is intended for receiving or guiding components of the torque limiter. A preferred embodiment of the torque limiter according to the invention provides that the driver plate is assigned a friction lining on both sides within the drying chamber and a plate spring supported on the driver plate acts on the friction linings via an intermediate plate. Due to this arrangement, the friction linings are in a protected position, which has a positive effect on the service life of the torque limiter. A suitable material for the dry, solvent-free and asbestos-free friction linings is, for example, a sintered material or a friction lining made of organically bound, fiber-reinforced materials. For the drive plate as well as the support plate that comes with the dry If friction linings are in an operative connection, a wear-resistant steel material is preferably suitable.

In a preferred embodiment of the invention it is provided that the pendulum masses of the centrifugal pendulum device are pivotably mounted on a pendulum flange in a largely closed housing. The centrifugal pendulum device thus forms a structural unit which is axially offset from the secondary part of the torsional vibration damper and which is connected to the drive plate via the step bolt on the one hand, and to the output hub on the radially inner side, preferably via a toothing, in a form-fitting manner.

Furthermore, according to an advantageous embodiment, the invention offers the possibility of providing the housing of the centrifugal pendulum device with a wall section which is bent at right angles and which surrounds the pendulum masses at a radial distance to form a burst protection. In addition or as an alternative to this, the housing of the centrifugal pendulum device can include one or more circumferentially positioned balancing rivets that allow simple balancing of the centrifugal pendulum device and / or the torsional vibration damper.

Another preferred embodiment of the invention provides for the spring damper device to be integrated in a spring space largely enclosed by the primary part and an associated primary cover, this being sealed radially on the inside by means of a sealing arrangement. The two sealing rings of the sealing arrangement are supported in an axially pretensioned manner on the carrier flange or the support disk of the secondary part, for example by means of a plate spring. On the opposite side, a first sealing ring is arranged on the primary part and the further sealing ring is fixed in position on the primary cover of the primary part. Due to this sealing arrangement, the dry friction linings of the torque limiter are shielded in such a way that contact with the lubricant of the spring damper device including the arc springs is avoided and the friction linings are thus effectively protected from a negative influence of grease.

The torsional vibration damper, which is designed to be easy to dismantle and assemble according to the invention and includes a torque limiter and a centrifugal pendulum device, is preferably suitable for hybrid applications. Such a torsional vibration damper, also known as a hybrid module, is integrated in a drive train of a motor vehicle, which is alternatively driven by an internal combustion engine or an electric motor or is driven simultaneously by both drive sources. Motor vehicle manufacturers require torque limiters especially for DHT hybrid applications (dedicated hybrid transmission) in order to protect components within the transmission from overload.

In a preferred embodiment of the invention it is provided that at least the components of the secondary part such as the carrier flange, the drive plate, the support plate and the output hub and also the individual parts of the housing of the centrifugal pendulum device are designed as a formed part or stamped part. With this method, these components can advantageously be manufactured without cutting at low cost, and they also have a weight advantage over comparably shaped cast parts.

Another aspect of the invention relates to a method with which the torsional vibration damper can be dismantled and also mounted on the crankshaft of an internal combustion engine. A first method step provides for a toothing between two components of the secondary part to be released by means of an axial displacement. For this purpose, the output hub including the associated centrifugal pendulum device is first displaced with respect to a drive plate by pulling an axial force directed against a spring force. A subsequent method step provides for the output hub to be rotated up to a position in which a positional correspondence is established between the recesses in the output hub and the fastening screws of the torsional vibration damper. Without an axial force, the output hub moves automatically in the direction of the drive plate, whereby these components are again connected in a rotationally fixed form-fitting manner via the toothing. In this position, the fastening screws can be loosened by means of a normal tool guided through the recesses of the output hub. In addition, this output hub position enables the torsional vibration damper to be mounted again.

• 1 eine Ausführungsform von einem erfindungsgemäß aufgebauten Drehschwingungsdämpfer in einem Halbschnitt;
• 2 ein Detail Z der 1 in einer vergrößerten Darstellung;
• 3 eine Mitnehmerscheibe des in 1 gezeigten Drehschwingungsdämpfers in einer Perspektive; und
• 4 Einzelheiten der Mitnehmerscheibe gemäß 3 in einer vergrößerten Darstellung.

The invention is explained below on the basis of a preferred embodiment with reference to the accompanying figures. However, the invention is not restricted to the exemplary embodiment shown. The same components are identified by the same reference symbols in the figures. Show:

• 1 an embodiment of a torsional vibration damper constructed according to the invention in a half section;
• 2 a detail Z of 1 in an enlarged view;
• 3 a drive plate of the in 1 torsional vibration damper shown in a perspective; and
• 4th Details of the drive plate according to 3 in an enlarged view.

The 1 shows an example of a torsional vibration damper designed as a dual mass flywheel 1 with a primary part 2 and a secondary part 3 around the axis of rotation 4th are rotatable together and rotatable to a limited extent relative to one another. Between the primary part 2 and the abutment 3 is a spring damper device 5 with as bow springs 6th executed mechanical energy storage effective. The torsional vibration damper intended for a drive train of a motor vehicle driven by an internal combustion engine, in particular for a DHT hybrid application 1 has the task of damping rotational irregularities in the drive train caused by the internal combustion engine.

The primary part 2 comprises a flange element 7th , which is one piece radially on the outside with a primary cover 8th is connected, which together have one to accommodate the bow springs 6th certain spring space 9 enclose. There are the bow springs 6th with one spring end on stops (not shown) of the primary part 2 and with the other spring end on a carrier flange 10 of the multi-part secondary part 3 supported.

The primary part is in the installed state 2 the torsional vibration damper 1 by means of a variety of screws 29 attached to a crankshaft (not shown) of an internal combustion engine, which is in associated bores 30th of the flange element 7th from the primary part 2 are used. The abutment 3 is via an output hub 11 for example connected to a transmission input shaft (not shown). The torsional vibration damper 1 has a torque limiter designed as a friction device 12th on, which is provided, in particular the torsional vibration damper 1 to limit downstream components to a torque that can be reliably transmitted. Using the in the abutment 3 between the beam flange 10 and the output hub 11 integrated torque limiter 12th is a torque up to a maximum torque frictionally engaged between the primary part 2 and the abutment 3 transferable. As soon as the torque is greater than the maximum torque, torque is transmitted through the torque limiter 12th interrupted.

The torque limiter 12th includes a radial in the direction of the axis of rotation 4th open, U-shaped drying room 13th axially from a cranked section 14th of the beam flange 10 as well as a cranked support disc 15th is limited to that of riveted joints 23 are joined together. The drying room 13th serves to hold a drive plate 16 , which has a dry friction lining on both sides 17th , 18th is assigned, one indirectly on the drive plate 16 supported disc spring 19th Via an axially displaceable, rotationally fixed intermediate plate 20th the friction linings 17th , 18th force applied. As a measure to the dry friction linings 17th , 18th of the torque limiter 12th The spring chamber, which is at least partially filled with a lubricant, is to be protected from a negative influence of grease 9 the spring damper device 5 sealed. For this purpose, one of two axially pretensioned sealing rings is used 21 , 22nd existing sealing arrangement provided. The first sealing ring 21 is between the primary part 2 and the support disc 15th inserted and the second sealing ring 22nd is axially preloaded between the primary cover by means of a disc spring 8th and the carrier flange 10 positioned in a fixed position.

The torsional vibration damper 1 is one axially in front of the abutment 3 positioned centrifugal pendulum device 24 assigned as a separate unit with the drive plate 16 and the output hub 11 connected is. The centrifugal pendulum device 24 includes several in a largely closed housing 25th integrated pendulum masses pivoted on a pendulum flange (not shown) 26th . A radially outer, angled wall section 27 of the housing 25th forms a burst protection for the pendulum masses 26th . The housing also closes 25th at least one rivet 28 one that simplifies balancing of the torsional vibration damper 1 enables.

To dismantle the torsional vibration damper 1 Components of the secondary part are to be simplified by the crankshaft of the internal combustion engine 3 detachable so that the output hub 11 compared to the primary part 2 is adjustable to a limited extent. This can be done on the support disc 15th guided output hub 11 together with the centrifugal pendulum device 24 in the direction of the arrow against the direction of force of a compression spring 34 are shifted axially, creating a toothing 31 between the output hub 11 and the drive plate 16 solves.

The 2 illustrated in an enlarged illustration of the detail Z according to FIG 1 further design details that an axial displacement of the output hub 11 and an associated loosening of the toothing 31 enable. These are in the housing 25th the centrifugal pendulum device 24 several step bolts 32 fixed in position, each in an elongated hole 33 the drive plate 16 intervention. On the primary part side are on the drive plate 16 circumferentially distributed compression springs 34 supported, each one through an elongated hole 33 guided step bolts 32 enclose and at the same time at one end disc 35 of the step bolt 32 are fixed. After an axial displacement of the output hub 11 allow the elongated holes 33 twisting of the step bolts 32 including associated compression springs 34 up to a coincidence of openings 36 the output hub 11 with holes 30th in the primary part 2 (shown in 1 ). The length of the elongated holes 33 is designed so that the output hub 11 Can be rotated unhindered to the extent that there is an alignment between the openings 36 in the output hub 11 and the screws 29 adjusts, eliminating the screws 29 for the purpose of dismantling the torsional vibration damper 1 can be released without a special tool. After the force applied for the axial displacement has ceased to exist, the drive hub becomes 11 by the compression springs 34 automatically in the starting position, ie in the toothing 31 with the drive plate 16 postponed. Due to the changing positioning of the drive hub 11 opposite drive plate 16 can also simplify assembly of the torsional vibration damper 1 respectively.

The 3 and 4th show in particular the position and size of the step bolts for receiving and guiding the step bolts 32 certain elongated holes 33 in the drive plate 16 . Every elongated hole 33 is in a locally axially projecting tab 37 the drive plate 16 brought in. As in 3 shown, the drive plate closes 16 three elongated holes offset by 120 ° to each other, each curved in a kidney shape 33 a.

List of reference symbols

1

Torsional vibration damper

2

Primary part

3

Abutment

4th

Axis of rotation

5

Spring damper device

6th

Bow feather

7th

Flange element

8th

Primary cover

9

Spring room

10

Girder flange

11

Output hub

12th

Torque limiter

13th

Drying room

14th

section

15th

Support disc

16

Drive plate

17th

Friction lining

18th

Friction lining

19th

Disc spring

20th

Intermediate plate

21

Sealing ring

22nd

Sealing ring

23

Riveted connection

24

Centrifugal pendulum device

25th

casing

26th

Pendulum mass

27

Wall section

28

Balancing rivet

29

screw

30th

drilling

31

Interlocking

32

Step bolts

33

Long hole

34

Compression spring

35

disc

36

opening

37

Tab

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102012202255 A1 [0002]
• DE 102006028556 A1 [0003]
• DE 102009042836 A1 [0003]
• DE 102017119375 A1 [0004]
• DE 102014217853 A1 [0005]

Claims (10)

Torsional vibration damper (1), constructed as a dual-mass flywheel with a primary part (2) and a secondary part (3), which are rotatably arranged together about an axis of rotation (4) and rotatable relative to one another and between which a spring damper device (5) is arranged in the torque flow , wherein the multi-part secondary part (3) includes a torque limiter (12) and whose carrier flange (10) and drive plate (16) are connected via at least one friction lining (17, 18) and the drive plate (16) with an output hub (11) and a centrifugal pendulum device (24) is coupled and the primary part (2) is fastened to a crankshaft of an internal combustion engine by means of screws (29) which pass through openings (36) of at least one component of the secondary part (3) in bores (30) of the primary part (2 ) can be used, characterized in that the output hub (11) is axially guided on a support disk (15) assigned to the carrier flange (10) and a the drive plate (16) with the output hub (11) positively connecting toothing (31) by an axial displacement of the output hub (11) against the spring force of at least one compression spring (34) and then the output hub (11) to match the position of the openings (36) is rotatable in the output hub (11) and the bores (30) of the primary part (2). Torsional vibration damper (1) Claim 1 , Characterized in that the primary part side circumferentially distributed on drive plate (16) supported compression springs (34) each enclosing a fixed position in a housing (25) of the centrifugal device (24) stepped bolt (32), wherein the stepped bolt (32) in the curved running slots (33 ) the drive plate (16) are guided with play. Torsional vibration damper (1) Claim 1 , characterized in that a cranked section (14) of the carrier flange (10) together with the cranked support disc (15) axially delimit a drying space (13) intended to accommodate components of the torque limiter (12). Torsional vibration damper (1) Claim 3 , Characterized in that the drive plate (16) within the drying compartment (13) on both sides of a friction lining (17, 18) is assigned to and one on the drive plate (16) supported plate spring (19) via an intermediate plate (20), the friction linings (17, 18) is subject to force. Torsional vibration damper (1) Claim 1 , characterized in that the centrifugal pendulum device (24) which is integrated in a largely closed housing (25) and has pendulum masses (26) pivotably mounted on a pendulum flange forms a structural unit which is axially offset to the secondary part (3) and which with the drive plate (16) and is connected to the output hub (11). Torsional vibration damper (1) Claim 5 , characterized in that a wall section (27) of the housing (25) which is beveled at right angles and enclosing the centrifugal pendulum device (24) at a radial distance forms a burst protection for the pendulum masses (26) and / or includes at least one balancing rivet (28). Torsional vibration damper (1) according to one of the Claims 1 to 6th , characterized in that the spring damper device (5) is integrated in a spring chamber (9) which is largely enclosed by the primary part (2) and an associated primary cover (8) and which is sealed radially on the inside by means of a sealing arrangement enclosing two sealing rings (21, 22) . Torsional vibration damper (1) according to one of the Claims 1 to 7th , Characterized in that the torsional vibration damper (1) with built-in torque limiter (12) and a centrifugal device (24) for hybrid applications, in particular DHT hybrid applications, is provided. Torsional vibration damper (1) according to one of the Claims 1 to 8th Characterized in that at least the components of the secondary part (3) and the housing (25) of the centrifugal device (24) are designed as a formed part or a stamped part. Method for dismantling and assembling a torsional vibration damper (1), which is connected to a crankshaft of an internal combustion engine, according to one of the Claims 1 to 9 , characterized in that the output hub (11) can be rotated into a position by an axial displacement of the output hub (11) including the centrifugal pendulum device (24) against a spring force of the compression spring (34), wherein in a position match between the opening (36) the Output hub (11) and an arrangement of the screws (29) with which the torsional vibration damper (1) is attached, a dismantling or assembly of the torsional vibration damper (1) can take place.

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