Torque transmission device for an automotive drivetrain

Abstract

The present invention relates to a torque transmission device (1) for a drive train of a motor vehicle, the torque transmission device (1) comprising an input element (5) which can be screwed onto a crankshaft of an internal combustion engine of the motor vehicle, a torque limiter (3) following the input element (5) and a following output element (6) which is connected to the torque limiter (3) in a non-rotatable manner by means of a form-fit connection (13), the output element (6) being biased against the torque limiter (3) in the axial direction (A) of the torque transmission device (1) by the force of an application means (14), in particular a spring. The present invention relates to a torque transmission device (1) that is held in a first position (15) and is displaceable in an axial direction (A) against the force of an application means (14), and as the output element (6) is displaced in the axial direction (A), it can take a second position (16) in which the form-fit connection (13) continues to exist, and as the output element (6) is displaced in the axial direction (A), it can take a third position (17) in which the form-fit connection (13) is released and the output element (6) is rotatable relative to the torque limiter (3).

Description

[Technical field]

[0001] The present invention relates to a torque transfer device for an automotive drivetrain. [Background technology]

[0002] From DE 10 2019120220 A1 a torque transmission device for the drive train of a motor vehicle is known which comprises an input-side torsional vibration damper, a subsequent torque limiter and a subsequent centrifugal pendulum device, the input side of which is connected non-rotatably to the output side of the torque limiter. Summary of the Invention [Problem to be solved by the invention]

[0003] SUMMARY OF THE DISCLOSURE It is an object of the present invention to provide a torque transmission device for a drive train of a motor vehicle which can be removed and subsequently reinstalled in a simple manner. [Means for solving the problem]

[0004] According to the invention, this problem is solved by a torque transmission device for a drive train of a motor vehicle as claimed in claim 1. Preferred embodiments of the invention are defined in the dependent claims.

[0005] A torque transmission device for a drive train of a motor vehicle comprises an input element that is screwable to a crankshaft of an internal combustion engine of the motor vehicle, a torque limiter following the input element, and a following output element that is non-rotatably connected to the torque limiter by means of a form-fit connection, the output element being held in a first position in the axial direction of the torque transmission device by the force of an application means, in particular a spring, and being axially displaceable against the force of the application means, the output element being able to assume a second position in which the form-fit connection continues to exist as it is displaced axially, and a third position in which the form-fit connection is released and the output element is rotatable relative to the torque limiter as it is displaced axially, whereby in particular the crankshaft thread is accessible after the torque limiter has been activated by a torque peak during operation of the motor vehicle, which facilitates the removal and subsequent installation of the torque transmission device.

[0006] Preferably, the input element comprises a torsional vibration damper, in particular a bow spring damper, whose input flange is screwable or is screwed to the crankshaft of the internal combustion engine and whose output flange forms the input side of the torque limiter. In particular, the torsional vibration damper, preferably the bow spring of the torsional vibration damper, is arranged outside the torque limiter in the radial direction of the torque transmission device, and the torsional vibration damper and the torque limiter preferably overlap in the axial direction.

[0007] The output element, which is non-rotatably connected to the torque limiter using a form-fit connection, preferably comprises a hub which is non-rotatably connectable or connected to an output shaft. The output shaft may be a transmission input shaft or an intermediate shaft of a hybrid drivetrain of a motor vehicle. The non-rotatable connection is preferably made using a plug-in toothing. For this purpose, the hub is preferably provided with inner toothing extending radially inwards.

[0008] It is furthermore advantageous if the output element is provided with a torsional vibration absorber, in particular a centrifugal pendulum device, which is non-rotatable. For this purpose, preferably at least one first centrifugal pendulum flange is connected to the hub. Preferably, the centrifugal pendulum device is a so-called two-flange pendulum, in which the circumferentially distributed pendulums are axially pivotably arranged on rollers between two centrifugal pendulum flanges, which are spaced apart from each other by spacer bolts. The first of these centrifugal pendulum flanges is non-rotatably connected to the hub, preferably riveted, while the second of these centrifugal pendulum flanges is non-rotatably connected to the first centrifugal pendulum flange by a spacer bolt, preferably riveted.

[0009] However, the centrifugal pendulum device can also be a so-called one-flange pendulum, in which the circumferentially distributed pendulum pairs are arranged axially on either side of a single, central centrifugal pendulum flange, with a first weight of the pendulum pair being arranged on the side of the centrifugal pendulum flange facing the input side of the torque transmission device, whereas a second weight of the pendulum pair is arranged on the side of the centrifugal pendulum flange facing the output side of the torque transmission device.

[0010] Preferably, the output element has at least one threaded through hole aligned with a corresponding threaded through hole in the input element for threadedly engaging the input element with a crankshaft of the internal combustion engine, thereby making the crankshaft threads accessible in particular after the torque limiter has been activated by a torque peak during operation of the motor vehicle, thereby facilitating removal and subsequent installation of the torque transmission device.

[0011] Preferably, the input flange of the torsional vibration damper has threaded holes distributed in the circumferential direction, through which the input flange can be screwed to the crankshaft of the internal combustion engine. Similarly, the output element, preferably a hub, has threaded through-holes distributed in the circumferential direction on the same radius and in the same number, which are aligned with the threaded through-holes for attaching the torque transmission device to the crankshaft. Preferably, the diameter of the threaded through-holes is at least equal to the diameter of the threaded hole aligned with the threaded through-hole, in particular larger than the diameter of the threaded hole aligned with the threaded through-hole.

[0012] The torque limiter is preferably configured as a friction clutch, so that the crankshaft thread is in particular accessible after the torque limiter has been activated by a torque peak during operation of the motor vehicle, which facilitates the removal and subsequent installation of the torque transmission device.

[0013] Preferably, the torque limiter is a friction clutch with a counter pressure plate, the position of which is fixed in the axial direction, and a pressure plate, to which a force is applied in the axial direction by a disk spring. Preferably, the output flange of the torsional vibration damper is frictionally sandwiched between the counter pressure plate and the pressure plate of the friction clutch, respectively, in the axial direction under the intermediate layer of friction linings. It is then advantageous if one of the substantially annular friction linings is fixed to the counter pressure plate at least in the circumferential direction of the torque transmission device, and the other of the substantially annular friction linings is fixed to the pressure plate at least in the circumferential direction. Furthermore, the friction clutch preferably has a side plate, which is fixedly connected to the counter pressure plate in a non-rotatable manner and in the axial direction, and which is also connected to the pressure plate in a non-rotatable manner. The pressure plate is arranged in the axial direction between the counter pressure plate and the side plate. A disk spring is supported on the side plate and applies a force to the pressure plate in the direction of the counter pressure plate against the output flange of the torsional vibration damper. The aforementioned plates are preferably formed as sheet metal parts.

[0014] It is furthermore advantageous if the input flange of the torsional vibration damper has a centering device by means of which the torque limiter is centered and supported, in particular supported.Preferably, the annular counter pressure plate of the friction clutch is supported by its inner edge on the centering device which projects in the axial direction of the input flange.Preferably, the centering device is formed on the input flange so as not to rotate relative to it, in particular has a threaded hole which is aligned with the threaded hole of the input flange.

[0015] Preferably, the form-fit connection allows for axial displacement of the output element relative to the torque limiter, is arranged between the torque limiter and the output element and is formed as a plug-in tooth, which allows access in particular to the crankshaft thread after the torque limiter has been activated by a torque peak during operation of the motor vehicle, thereby facilitating removal and subsequent installation of the torque transmission device.

[0016] It should be noted that in that case the form-fitting part must extend at least in the circumferential direction and be able to transmit torque and is preferably formed by a corresponding tooth or tooth surface of the plug-in toothing, i.e. the form-fitting connection between the torque limiter and the output element is at least non-rotatable. Preferably, due to the output element being in contact with the counter pressure plate, the annular counter pressure plate extends further inwards in the radial direction R than the side plate connected to the counter pressure plate, limiting the possible displacement of the output element in the axial direction, more precisely towards the input side of the torque limiter. This device defines a first position of the output element.

[0017] It is advantageous if the spring is supported on a support ring which is connected non-rotatably to the output side of the torque limiter and is preloaded against a flange part of the output element, which is preferably provided on its outer periphery with an external toothing of a plug-in tooth, so that after the torque limiter has been activated by a torque peak during operation of the motor vehicle, in particular the crankshaft thread is accessible, which facilitates the removal and subsequent installation of the torque transmission device.

[0018] The flange portion is preferably a radially outer portion of the hub. An external toothing on the outer periphery of the flange portion preferably meshes with a corresponding internal toothing formed on the inner periphery of the annular side plate of the friction clutch. It should be noted that at least in the region of the plug-in teeth, the thickness of the axial flange portion is preferably greater than the thickness of the axial side plate. It should further be noted that in the region of the plug-in teeth, the thickness of the axial flange portion is preferably less than the combined thickness of the axial side plate and the support ring. This preferred embodiment allows that in the second position of the output element, when the output element is no longer in contact with the counter pressure plate, a form-fit connection can still exist between the torque limiter and the flange portion of the output element or hub.

[0019] Preferably, the spring is configured as a disk spring, which holds the output element in a first axial position relative to the torque limiter, so that after the torque limiter has been activated by a torque peak during operation of the motor vehicle, the crankshaft thread is in particular accessible, which facilitates the removal and subsequent installation of the torque transmission device.

[0020] The disk spring preferably rests in its inner region against the flange portion of the hub and in its outer region against the support ring. In the first position of the output element the disk spring preferably has a conical shape, while in the second position of the output element the disk spring is flat and preferably rests in its inner region in a plane against the surface of the flange portion of the hub facing the output side of the torque transmission device.

[0021] It is advantageous if the disk spring is limitedly rotatable in the circumferential direction of the torque transmission device relative to the torque limiter, preferably held in a limited rotational manner by a support ring, so that after the torque limiter has been activated by a torque peak during operation of the motor vehicle, the crankshaft thread is in particular accessible, which facilitates the removal and subsequent installation of the torque transmission device.

[0022] Advantageously, the disk spring forms a type of spring-loaded bayonet lock, which prevents the form-fit connection in the circumferential direction, and in particular the non-rotatable connection, between the torque limiter and the output element from being maintained in the axial direction only by the force of the disk spring in the form of a preload. To be precise, the bayonet lock is also used for a form-fit in the axial direction in the second position of the output element, which prevents the form-fit from making it possible to release the non-rotatable connection between the torque limiter and the output element without additional measures.

[0023] Preferably, in an initial position, the disk spring spatially limits the axial displacement of the output element to a second position, and in a rotational position rotated relative to the initial position, the disk spring releases the spatial limitation and allows the output element to be displaced to a third position in the axial direction, thereby making the crankshaft threaded portion particularly accessible after the torque limiter has been activated by a torque peak during operation of the vehicle, thereby facilitating removal and subsequent installation of the torque transmission device.

[0024] Preferably, the spatial constraint coincides with the form fit in the axial direction by preventing the flat-pressed disc spring from moving the flange portion of the hub further away from the counter pressure plate.

[0025] It is advantageous if the disc spring has a long disc spring tongue and a short disc spring tongue on its outer periphery, the disc spring being supported by the long disc spring tongue on the support ring in both the initial position and in the rotated position, and the disc spring being supported by the short disc spring tongue on the support ring, preferably on a protrusion of the support ring extending radially inwardly of the torque transmission device, in the initial position, which limits the axial displacement of the disc spring such that the disc spring spatially limits the displacement of the output element beyond the second position, and the short disc spring tongue allows the axial displacement of the disc spring in the rotated position of the disc spring, by being no longer supported by the support ring, preferably on a protrusion extending radially inwardly, thereby spatially releasing the displacement of the output element to the third position. This allows access in particular to the crankshaft threads after the torque limiter has been activated by a torque peak during operation of the vehicle, thereby facilitating removal and subsequent installation of the torque transmission device.

[0026] In the third position, the disk spring is still pressed flat and additionally together with the flange portion of the hub is axially slightly further away from the input side of the torque transmission device than in the second position, or the disk spring has taken on an inversely conical shape compared to the first position. In both cases, it is advantageous to disengage the tooth mesh formed by the inner toothing on the inner circumference of the annular side plate of the friction clutch and the outer toothing on the outer circumference of the flange portion of the hub.

[0027] It is furthermore advantageous if the output element is provided with a centrifugal pendulum device having at least one first centrifugal pendulum flange, which has an opening on a radius of the disk spring, preferably in the form of an elongated hole, through which a tool can be inserted for rotating the disk spring, so that the crankshaft thread is in particular accessible after activation of the torque limiter by a torque peak during operation of the motor vehicle, which facilitates the removal and subsequent installation of the torque transmission device.

[0028] Advantageously, in that case the disc spring can be rotated using its long or short disc spring tongues.

[0029] Furthermore, the centrifugal pendulum device is preferably equipped with at least one first centrifugal pendulum flange rotatable about a rotation axis, at least one pendulum displaceably mounted on the first centrifugal pendulum flange to counteract rotational irregularities, and at least one hub connected to the first centrifugal pendulum flange in a non-rotatable manner, the hub being arranged in a radial area relative to the rotation axis and overlapping the radial area in which the pendulum is arranged and having a connection part formed for connection to a torque transmission device, the first centrifugal pendulum flange having a first tool through hole formed in the first centrifugal pendulum flange in the radial area of ​​the connection part, whereby accessibility of the connection part is ensured by penetrating the centrifugal pendulum flange, which facilitates the mounting and dismounting of the centrifugal pendulum device.

[0030] The connecting portion may be integrally formed with the hub, but may also be formed as a separate component, the spatial relationship of the separate component with the hub being finally determined only during preparation for connection with the torque transmission device or during the specific connection process.

[0031] The hub is non-rotatably connectable or connected to an output shaft, which may be a transmission input shaft or an intermediate shaft of a hybrid drivetrain of a motor vehicle. The non-rotatable connection is preferably made using a plug-in toothing. For this purpose, the hub is preferably provided with an internal toothing extending radially inwards of the centrifugal pendulum device.

[0032] Preferably, the centrifugal pendulum flange has an additional alignment opening which can be used to align the centrifugal pendulum device during installation.

[0033] Preferably, the connecting part has a connecting hole, which is aligned with the first tool through hole in the axial direction of the centrifugal pendulum device, thereby ensuring the accessibility of the connecting part by penetrating the centrifugal pendulum flange, which facilitates the installation and removal of the centrifugal pendulum device.

[0034] Aligned in this context means that a tool, for example a screwing or riveting tool, can be inserted into the first tool through-hole and the connecting means can be attached by means of this tool or that in the connection hole the torque transmission device can be connected in the process of attachment, for example screwed or riveted. This means that the first tool through-hole is usually larger than the connection hole. In particular, aligned therefore means that the connection hole is completely inside the outer edge of the first tool through-hole, when viewed in the axial direction of the centrifugal pendulum device. Thus, for example, it is possible for two connection holes to be inside the outer edge of the respective first tool through-hole and aligned with the respective first tool through-hole.

[0035] The contours or shapes of both openings may be different. Preferably, the connecting hole is annular, while the first tool through-hole has at least a circular contour portion, in particular also completely annular. It is particularly advantageous if the first tool through-hole has an imaginary or interpolated diameter, if necessary, that is at least 11 mm larger than the diameter of the connecting hole.

[0036] It is advantageous if the connection part is formed as a support ring that is not fixedly connected to the hub, and the connection hole of the support ring is only axially aligned with the first tool through-hole when the centrifugal pendulum device is actuated by the torque transmission device, whereby accessibility of the connection part is ensured by passing through the centrifugal pendulum flange, which facilitates the installation of the centrifugal pendulum device.

[0037] For example, the support ring slides on the hub or is centered by the hub, not fixedly, in particular rotatably. Likewise, the support ring can be indirectly frictionally aligned with the hub by a further component, for example by a disk spring, so that the support ring can still be rotated with respect to the hub during preparation for connection with the torque transmission device. There is preferably no form-fit or material-fit connection with the hub. The support ring may have support parts that are axially offset with respect to the connection hole, which support parts serve to axially support the disk spring. These support parts may have radially inwardly projecting projections, in particular for forming a bayonet lock with the disk spring.

[0038] Preferably, the connection hole is provided by punching, and preferably the punch sag is formed on the opposite side when mounting to the remaining torque transmission device already previously mounted or on the opposite side from the first centrifugal pendulum flange. The punch sag facilitates the insertion of the connection means from the direction of the torque transmission device, thereby facilitating the mounting of the centrifugal pendulum device.

[0039] Correspondingly, a punch burr is preferably formed on the side facing the first centrifugal pendulum flange. The support ring is preferably a sheet metal part, while the hub is preferably a forged or sheet metal part.

[0040] Preferably, the pendulum at least partially covers the first tool through-hole when the pendulum's center of gravity is displaced radially inwards of the centrifugal pendulum device, and conversely, it is advantageous if the tool through-hole is not blocked when the pendulum's center of gravity is displaced maximally radially outwards, thereby facilitating the mounting and dismounting of the centrifugal pendulum device.

[0041] Preferably, a plurality of tool through holes are formed in the first centrifugal pendulum flange distributed circumferentially around the centrifugal pendulum device, preferably at the same radius and / or evenly spaced, which facilitates mounting and dismounting of the centrifugal pendulum device.

[0042] It is particularly advantageous if each first tool through-hole is arranged in the circumferential direction between two adjacent pendulums, and in particular if three pendulums are attached to the first centrifugal pendulum flange and are arranged evenly distributed in the circumferential direction, i.e. offset by 120° from one another.

[0043] It is advantageous if a second centrifugal pendulum flange is arranged offset in parallel to the first centrifugal pendulum flange, the second centrifugal pendulum flange having a second tool through-hole aligned with the first tool through-hole in the axial direction of the centrifugal pendulum device, the pendulum being displaceably mounted between both centrifugal pendulum flanges. The aligned tool through-holes facilitate the mounting and dismounting of the centrifugal pendulum device.

[0044] The above description of the first tool through hole applies equally to the second tool through hole. Preferably, the first centrifugal pendulum flange has a burst protection for the pendulum on its periphery, while the second centrifugal pendulum flange can use an optional balancer on its periphery, preferably using a balance hole and, if necessary, a balance rivet mounted therein, to balance the centrifugal pendulum device separately from the rest of the torque transmission device.

[0045] Preferably, the second centrifugal pendulum flange is connected to the first centrifugal pendulum flange in a manner that prevents relative rotation, whereby the accessibility of the connection part is ensured by penetrating the centrifugal pendulum flange, which facilitates the installation and removal of the centrifugal pendulum device.

[0046] It is advantageous if the spacer bolt connects the first centrifugal pendulum flange to the second centrifugal pendulum flange, preferably in the region of the tool through-hole, so that the accessibility of the connection is ensured by passing through the centrifugal pendulum flange, which facilitates the mounting and dismounting of the centrifugal pendulum device.

[0047] Preferably, the spacer bolt forms a stop for limiting the swing angle of the pendulum, whereby the accessibility of the connection part is guaranteed by penetrating the centrifugal pendulum flange, which facilitates the installation and removal of the centrifugal pendulum device.

[0048] Furthermore, a torque transmission device for a drive train of a motor vehicle comprises an input-side torsional vibration damper according to one of the above-mentioned embodiments, a subsequent torque limiter and a subsequent centrifugal pendulum device, the connection part of the torque limiter is connected to the output side of the torque limiter in a non-rotatable manner and is preferably riveted by a support ring rivet attached to a connection hole of a support ring, whereby the accessibility of the connection part is ensured by penetrating the centrifugal pendulum flange, which facilitates the installation and removal of the centrifugal pendulum device.

[0049] The present invention will be described in detail below using preferred embodiments in combination with the associated figures. [Brief description of the drawings]

[0050] [Figure 1] 2 is a perspective schematic view of an embodiment of a torque transmission device without a centrifugal pendulum device yet attached or with the centrifugal pendulum device removed; FIG. [Diagram 2] FIG. 2 is a half sectional view of a torque transmission device with a centrifugal pendulum device attached thereto; [Diagram 3] FIG. 2 shows a top view of the centrifugal pendulum device without a support ring, with the second centrifugal pendulum flange installed in the upper region and with the second centrifugal pendulum flange removed in the lower region. [Figure 4] FIG. 2 is a top view of a centrifugal pendulum device with a support ring and a torque limiter connected to the support ring on the input side. [Figure 5a] FIG. 2 is a half-sectional view of a torque transmission device with a centrifugal pendulum device attached, with the output element of the torque transmission device in a first position. [Figure 5b] FIG. 2 is a detailed view of the torque transmission device with the centrifugal pendulum device attached, with the output element of the torque transmission device in a second position. [Figure 5c] FIG. 2 is a half-sectional view of a torque transmission device with a centrifugal pendulum device attached, in which the output element of the torque transmission device is in a second position. [Figure 5d]FIG. 2 is a top view of the torque transmission device with the centrifugal pendulum device attached, with the disk spring of the centrifugal pendulum device in its initial position; [Figure 6a] 5b shows the same half-section as FIG. 5a of the torque transmission device with the centrifugal pendulum device mounted, with the output element of the torque transmission device in a first position; [Figure 6b] FIG. 2 is a detailed view of the torque transmission device with the centrifugal pendulum device attached, with the output element of the torque transmission device in a third position. [Figure 6c] FIG. 2 is a half-sectional view of a torque transmission device with a centrifugal pendulum device attached, in which the output element of the torque transmission device is in a third position. [Figure 6d] FIG. 2 is a top view of the torque transmission device with the centrifugal pendulum device mounted, with the disk spring of the centrifugal pendulum device in a rotated position; [Figure 7a] FIG. 2 is a top view of the torque transmission device with the centrifugal pendulum device attached. [Figure 7b] FIG. 7b is a detail view taken from FIG. 7a with the disc spring in the initial position. [Figure 7c] FIG. 7b is a detail view taken from FIG. 7a with the disk spring in rotated position. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0051] In figures 1 to 7c an embodiment of a centrifugal pendulum device 4 for a torque transmission device 1 and an embodiment of a torque transmission device 1 for a drive train of a motor vehicle with a torsional vibration damper 2, a torque limiter 3 and a centrifugal pendulum device 4 are shown. Features not described in the following description as essential to the invention are to be understood as optional.

[0052] 1 to 7c show an embodiment of a centrifugal pendulum device 4 for a torque transmission device 1 and an embodiment of a torque transmission device 1 with a torsional vibration damper 2, a torque limiter 3 and a torsional vibration absorber for a drive train of a motor vehicle, in particular with the aforementioned centrifugal pendulum device 4. Features not described in the following description as essential to the invention are to be understood as optional.

[0053] The torque transmission device 1 has an input element 5 which can be or is screwed to a crankshaft of an internal combustion engine of a motor vehicle. Furthermore, the torque transmission device 1 has an output element 6 which can be or is non-rotatably connected to an output shaft. The output shaft can be a transmission input shaft or an intermediate shaft of a hybrid drivetrain of the motor vehicle.

[0054] In the illustrated embodiment, the input element 5 has a torsional vibration damper 2, which is in particular configured as a bow spring damper, and whose input flange 7 can be or is screwed onto the crankshaft of the internal combustion engine. An output flange 8 of the torsional vibration damper 2 forms the input side 39 of the torque limiter 3. In particular, the torsional vibration damper 2, preferably the bow spring 11 of the torsional vibration damper, is arranged outside the torque limiter 3 in the radial direction R of the torque transmission device 1, and the torsional vibration damper 2 and the torque limiter 3 preferably overlap in the axial direction A of the torque transmission device 1. The bow spring 11 is guided in a spring groove 10, preferably in a sliding shell, which spring groove 10 is formed by the input flange 7 and the cover disk 12. Furthermore, a centering device 9 is provided on the input flange 7, by means of which the torque limiter 3 is centered and supported, in particular supported.

[0055] The output element 6 is connected to the torque limiter 3 in a non-rotatable manner using a form-fit connection 13, the output element 6 being held in a first position 15 by the force of an application means 14, in particular a spring, in the axial direction A relative to the torque limiter 3, as shown in particular in Figures 2, 5a and 6a, and being displaceable in the axial direction A against the force of the application means 14, as shown in particular in Figures 5b, 5c, 6b and 6c. As the output element 6 is displaced in the axial direction A, it can assume a second position 16, as shown in Figures 5b and 5b, in which the form-fit connection 13 continues to exist. Furthermore, as the output element 6 is displaced in the axial direction A, it can assume a third position 17, as shown in Figures 6b and 6c, in which the form-fit connection 13 is released and the output element 6 is rotatable relative to the torque limiter 3.

[0056] The output element 6 has a hub 23, which is non-rotatably connectable or connected to the output shaft. In the illustrated embodiment, the non-rotatable connection is effected by means of a plug-in toothing. For this purpose, the hub 23 is provided with an internal toothing 32 extending radially inwards in the direction R.

[0057] A first centrifugal pendulum flange 37 of the centrifugal pendulum device 4 is connected non-rotatably to the hub 23. In the illustrated embodiment, the centrifugal pendulum device 4 is a so-called two-flange pendulum, in which the pendulums 41, which are distributed in the circumferential direction U of the torque transmission device 1, are arranged axially rotatably on rollers between two centrifugal pendulum flanges 37 and 38, which are spaced apart from one another by spacer bolts 42. The first of these, the centrifugal pendulum flange 37, is connected non-rotatably to the hub 23, preferably riveted, while the second of these, the centrifugal pendulum flange 38, is connected non-rotatably to the first centrifugal pendulum flange 37 by means of a spacer bolt 42, preferably riveted.

[0058] The output element 6 has at least one threaded through hole 35, which is aligned with a corresponding threaded hole 34 in the input element 5 for screwing the input element 5 to the crankshaft of the internal combustion engine. In particular, the input flange 7 of the torsional vibration damper 2 has threaded holes 34 arranged in a circumferential direction U, through which the input flange 7 can be screwed to the crankshaft of the internal combustion engine. Similarly, the output element 6, in particular the hub 23, has threaded through holes 35 arranged on the same radius and in the same number and distributed in the circumferential direction U, which are aligned with the threaded holes 34 for attaching the torque transmission device 1 to the crankshaft. Preferably, the diameter of the threaded through hole 35 at least corresponds to the diameter of the threaded hole 34 aligned with the threaded through hole 35, in particular is larger than the diameter of the threaded hole 34 aligned with the threaded through hole 35.

[0059] In the illustrated embodiment, the torque limiter 3 is a friction clutch with a counter pressure plate 18 fixed in position in the axial direction A and a pressure plate 19 to which a force is applied in the axial direction A by a disk spring 21. The output flange 8 of the torsional vibration damper 2 is respectively sandwiched in the axial direction A below an intermediate layer of friction linings 22 between the counter pressure plate 18 and the pressure plate 19 of the friction clutch in a friction fit manner. One of the substantially annular friction linings 22 is fixed at least in the circumferential direction to the counter pressure plate 18, and the other of the substantially annular friction linings 22 is fixed at least in the circumferential direction U to the pressure plate 19.

[0060] The friction clutch further comprises a side plate 20 which is fixedly connected to the counter pressure plate 18 in a non-rotatable manner and in the axial direction A, and which is also connected to a pressure plate 19 in a non-rotatable manner. The pressure plate 19 is arranged in the axial direction A between the counter pressure plate 18 and the side plate 20. A disk spring 21 is supported on the side plate 20 and applies a force to the pressure plate 19 in the direction of the counter pressure plate 18 against the output flange 8 of the torsional vibration damper 2. The aforementioned plates 18, 19, 20 are preferably formed as sheet metal parts.

[0061] In the embodiment shown, the annular counter pressure plate 18 of the friction clutch is supported by its inner edge on a centering device 9 which projects in the axial direction A of the input flange 7. The centering device 9 is formed non-rotatably on the input flange 7 and has, in particular, a threaded hole 34 which is aligned with a threaded hole 34 of the input flange 7.

[0062] The form-fit connection 13 allows the output element 6 to be displaced in the axial direction A relative to the torque limiter 3 and is arranged between the torque limiter 3 and the output element 6 and is formed as a plug-in toothing. It should be noted that the form-fit must then extend at least in the circumferential direction U and be capable of transmitting torque and is preferably formed by corresponding teeth or tooth flanks of the plug-in toothing, i.e. the form-fit connection 13 between the torque limiter 3 and the output element 6 is at least non-rotatable relative to one another.

[0063] In the illustrated embodiment, as can be seen in particular from Figures 2, 5a and 6a, the output element 6 is in contact with the counter pressure plate 18, so that the annular counter pressure plate 18 extends further inwards in the radial direction R than the lateral plate 20 to which it is connected, limiting the possible displacement of the output element 6 to the left in the axial direction A, more precisely towards the input side 39 of the torque limiter 3. This device defines a first position 15 of the output element 6.

[0064] The spring is supported on a support ring 24 which is connected non-rotatably to the output side 40 of the torque limiter 3 and is preloaded against a flange portion 27 of the output element 6. The flange portion 27 is provided on its outer periphery with an external toothing 26 of a plug-in toothing. The flange portion 27 is in particular the part of the hub 23 which is provided radially outward in the direction R. The external toothing 26 on the outer periphery of the flange portion 27 preferably meshes with a corresponding internal toothing 25 which is formed on the inner periphery of the annular side plate 20 of the friction clutch.

[0065] It should be noted that at least in the region of the plug-in teeth, the thickness of the flange portion 27 in the axial direction A is preferably greater than the thickness of the side plate 20 in the axial direction A. Furthermore, it should be noted that in the region of the plug-in teeth, the thickness of the flange portion 27 in the axial direction A is preferably less than the combined thickness of the side plate 20 and the support ring 24 in the axial direction A. This embodiment allows that in the second position 16 of the output element 6, when the output element 6 is no longer in contact with the counter pressure plate 18 (see FIG. 5c), the form-fit connection 13 can still be present between the torque limiter 3 and the flange portion 27 of the output element 6 or the hub 23.

[0066] The spring is configured as a disc spring 28, by means of which the output element 6 is held in the first position 15 in the axial direction A relative to the torque limiter 3. In its inner region the disc spring 28 bears against the flange portion 27 of the hub 23 and in its outer region against the support ring 24. In the first position 15 of the output element 6 the disc spring 28 has a conical shape (see Figures 5a and 6a), whereas in the second position 16 of the output element 6 the disc spring 28 is flat and, in particular in its inner region, bears in a plane against the surface of the flange portion 27 of the hub 23 facing towards the output side 40 of the torque transmission device 1, to the right with respect to Figure 5c.

[0067] The disk spring 28 is held by the support ring 24 so as to be limitedly rotatable in the circumferential direction U relative to the torque limiter 3. In particular, the disk spring 28 forms a kind of spring-loaded bayonet lock, which prevents the force of the disk spring 28 in the form of a preload from continuing the form-fit connection, more specifically a non-rotatable connection, in the circumferential direction U between the torque limiter 3 and the output element 6 in the axial direction A. To be precise, the bayonet lock is also used for a form fit in the axial direction A at the second position 16 of the output element 6 (see Figures 5b and 5c), which prevents that the non-rotatable connection between the torque limiter 3 and the output element 6 can be released without additional measures.

[0068] In the initial position shown in Fig. 5d, the disk spring 28 spatially limits the displacement of the output element 6 in the axial direction A to the second position 16. The spatial limit corresponds to a form fit in the axial direction A, by preventing the flat-pressed disk spring 28 from moving the flange portion 27 of the hub 23 away from the counter pressure plate 18 further to the right in relation to Fig. 5c. In a rotated position shown in Fig. 6d relative to the initial position, which is reached by rotation starting from Fig. 5d in the direction of the arrow, the disk spring 28 releases the spatial limit and allows the output element 6 to be displaced to a third position in the axial direction A (see Figs. 6b and 6c).

[0069] The disk spring 28 has a long disk spring tongue 29 and a short disk spring tongue 30 on its outer periphery. The disk spring 28 is supported by its long disk spring tongue 29 on the support ring 24 in the initial position as well as in the rotated position. The disk spring 28 is supported by its short disk spring tongue 30 on the support ring 24 in the initial position, in particular on a projection 33 of the support ring 24 extending inwardly in the radial direction R, which limits the displacement of the disk spring 28 in the axial direction A, such that the disk spring 28 spatially limits the displacement of the output element 6 beyond the second position 16 (see Figures 5b and 5c). The short disc spring tongues 30, in the rotated position of the disc spring 28, are no longer supported by the support ring 24, in particular by the protrusions 33 extending inward in the radial direction R, thereby allowing the disc spring 28 to be displaced in the axial direction A such that the disc spring 28 spatially releases the displacement of the output element 6 to the third position 17 (see Figures 6b and 6c), whereby the centrifugal pendulum device 4 can be rotated relative to the remaining torque transmission device 1 until the threaded holes 34 and the threaded through holes 35, which are no longer aligned during operation of the vehicle, are realigned due to the release of the torque limiter 3, whereby the crankshaft threaded part can be released using a corresponding tool and the entire torque transmission device 1 can be removed from the crankshaft.

[0070] In the embodiment shown, the support ring 24, which is riveted to the counter pressure plate 18 and to the side plate 20 using the support ring rivet 31, is aligned with the output element 6 displaced in the third position 17 or with the centrifugal pendulum device 4 displaced in the third position 17 via the inner edge of the support ring 24, preferably via a supporting portion protruding in the axial direction A, which is simultaneously used to support the disc spring 28 in the axial direction A.

[0071] In the third position 17, the disk spring 28 is still pressed flat and, additionally, together with the flange portion 27 of the hub 23, is either a little further in the axial direction A from the input side 39 of the torque transmission device 1 than in the second position 16, or the disk spring 28 has assumed an inversely conical shape compared to the first position 15. In both cases, the tooth mesh formed by the inner toothing 25 against the inner circumference of the annular side plate 20 of the friction clutch and by the outer toothing 26 against the outer circumference of the flange portion 27 of the hub 23 can be released.

[0072] In order to rotate the disc spring 28 from the outside, the first centrifugal pendulum flange 37, in particular the two centrifugal pendulum flanges 37, 38, have an opening, preferably in the form of an oblong hole 36, on a radius of the disc spring 28, through which a tool can be inserted for rotating the disc spring 28. Preferably, the disc spring 28 can then be rotated using its long disc spring tongue 29 or its short disc spring tongue 30, as illustrated in figures 7a to 7c.

[0073] With particular reference to FIGS. 1 to 4, the mounting of the centrifugal pendulum device 4 to the remaining torque transmission device 1, which is pre-supported in the torque path leading from the internal combustion engine, is described below.

[0074] As already mentioned to some extent above, the centrifugal pendulum device 4 has at least one first centrifugal pendulum flange 37, which is rotatable around the rotation axis D of the centrifugal pendulum device 4 or the torque transmission device 1. At least one pendulum 41 is displaceably mounted on the first centrifugal pendulum flange 37 in order to counteract rotational irregularities. The hub 23 is connected to the first centrifugal pendulum flange 37 in a non-rotatable manner and has a connection part 43, which is arranged in a radial area relative to the rotation axis D, which overlaps with the radial area in which the pendulum 41 is arranged. The connection part 43 is further formed for connection to the torque transmission device 1. The connection part 43 can be formed integrally with the hub 23, but can also be formed as a separate component, the spatial relationship of which with the hub 23 is finally determined only during preparation for connection to the torque transmission device 1 or during the specific connection process.

[0075] The first centrifugal pendulum flange 37 has a first tool through hole 45, which is formed in the radial area of ​​the connection portion 43 in the first centrifugal pendulum flange 37. Preferably, the centrifugal pendulum flange 37 has an additional centering opening, which can be used to align the centrifugal pendulum device 4 during installation.

[0076] The connecting part 43 has a connecting hole 44, which is aligned with the first tool through hole 45 in the axial direction A of the centrifugal pendulum device 4. Aligned in this context means that a tool, for example a screwing or riveting tool, can be inserted into the first tool through hole 45 and the connecting means can be attached by means of this tool or that in the connection hole 44 the torque transmission device 1 can be connected in the process of attachment, for example screwed or riveted. This means that the first tool through hole 45 is usually larger than the connection hole 44. In particular, aligned therefore means that, viewed in the axial direction A of the centrifugal pendulum device 4, the connecting hole 44 is completely inside the outer edge of the first tool through hole 45. Thus, it is possible, for example, for two connecting holes 44 to be inside the outer edge of the respective first tool through hole 45 and aligned with the respective first tool through hole.

[0077] The contours or shapes of both openings may be different. Preferably, the connecting hole 44 is annular, while the first tool through-hole 45 has at least a circular contour portion, in particular also completely annular. It is particularly advantageous if the first tool through-hole 45 has an optionally imaginary or interpolated diameter that is at least 11 mm larger than the diameter of the connecting hole 44.

[0078] In the illustrated embodiment, the connection part 43 is formed as a support ring 24 that is not fixedly connected to the hub 23, the connection hole 44 of the support ring 24 being permanently aligned in the axial direction A with the first tool through hole 45 only after the centrifugal pendulum device 4 is actuated by the torque transmission device 1. For example, the support ring 24 slides on the hub 23 without being fixed, in particular rotatably, or is centered by the hub 23. Likewise, the support ring 24 can be indirectly aligned in a friction-fit manner to the hub 23 by a further component, for example by the disk spring 28, so that the support ring 24 can still be rotated relative to the hub 23 during preparation for connection to the torque transmission device 1. A form-fit or material-fit connection with the hub 23 is preferably not present. The support ring 24 has support parts that are offset in the axial direction A with respect to the connection hole 44, which can be used to support the disk spring 28 in the axial direction A. These support parts may have projections 33 projecting inwards in the radial direction R, in particular for forming a bayonet lock with the disk spring 28 .

[0079] During installation, the connection part 43 is connected to the output side 40 of the torque limiter 3 in a non-rotatable manner and is preferably riveted by a support ring rivet 31 mounted in a connection hole 44 of the support ring 24. The connection hole 44 in the support ring 24, together with the entire support ring 24, is preferably provided by a stamping process. A stamping sag is formed on the side facing away from the first centrifugal pendulum flange 37, i.e. on the left side with respect to FIG. 1. Correspondingly, a stamping burr is formed on the side facing the first centrifugal pendulum flange 37, i.e. on the right side with respect to FIG. 1. The support ring 24 is preferably a sheet metal part, while the hub 23 is preferably a forged or sheet metal part.

[0080] The pendulum 41 at least partially covers the first tool through-hole 45 when the center of gravity of the pendulum 41 is displaced inward in the radial direction R of the centrifugal pendulum device 4. A number of tool through-holes 45 are formed in the first centrifugal pendulum flange 37, distributed in the circumferential direction U of the centrifugal pendulum device 4, preferably at the same radius and / or evenly spaced apart. Each first tool through-hole 45 is arranged in the circumferential direction U between two adjacent pendulums 41. In particular, three pendulums 41 are mounted on the first centrifugal pendulum flange 37, which are arranged evenly distributed in the circumferential direction U, i.e. offset by 120° from each other.

[0081] In the illustrated embodiment, the second centrifugal pendulum flange 38 is arranged offset in parallel to the first centrifugal pendulum flange 37. The second centrifugal pendulum flange 38 is connected to the first centrifugal pendulum flange 37 in a non-rotatable manner. The second centrifugal pendulum flange 38 has a second tool through hole 46, which is aligned with the first tool through hole 45 in the axial direction A of the centrifugal pendulum device 4. The pendulum 41 or pendulums 41 are displaceably mounted between both centrifugal pendulum flanges 37 and 38. The previous explanations regarding the first tool through hole 45 apply analogously to the second tool through hole 46.

[0082] Preferably, the first centrifugal pendulum flange 37 has burst protection for the pendulum 41 on its outer periphery, while the second centrifugal pendulum flange 38 can use any balancer on its outer periphery, preferably using balance holes and, if necessary, balance rivets mounted therein, to balance the centrifugal pendulum device 4 separately from the rest of the torque transmission device 1.

[0083] The spacer bolt 42 preferably connects the first centrifugal pendulum flange 37 to the second centrifugal pendulum flange 38 in the region of the tool through-holes 45, 46. In particular, the spacer bolt 42 forms a stop for limiting the oscillation angle of the pendulum 41.

[0084] The aforementioned embodiment relates to a torque transmission device 1 for a drive train of a motor vehicle, comprising an input element 5 which can be screwed onto a crankshaft of an internal combustion engine of the motor vehicle, a torque limiter 3 following the input element 5, and a following output element 6 which is non-rotatably connected to the torque limiter 3 by means of a form-fitting connection 13, in which the output element 6 is held in a first position 15 relative to the torque limiter 3 in the axial direction A of the torque transmission device 1 by the force of an application means 14, in particular a spring, and is displaceable in the axial direction A against the force of the application means 14, in which as the output element 6 is displaced in the axial direction A, it can assume a second position 16 in which the form-fitting connection 13 continues to be present and in which as the output element 6 is displaced in the axial direction A, it can assume a third position 17 in which the form-fitting connection 13 is released and the output element 6 is rotatable relative to the torque limiter 3. [Explanation of symbols]

[0085] 1. Torque transmission device 2 Torsional vibration damper 3 Torque limiter 4. Centrifugal pendulum device 5. Input Elements 6 Output elements 7 Input flange 8 Output flange 9 Centering device 10 Spring groove 11 Bow spring 12 Cover Disc 13 Form-fit connections 14 Application means 15 1st position 16 Second position 17 Third position 18 Counter pressure plate 19 Pressing plate 20 Side Plate 21 Disc spring 22 Friction Lining 23. Hub 24 Support Ring 25 Inner teeth 26 Outer teeth 27 Flange part 28 Disc spring 29 Long disc spring tongue 30 Short disc spring tongue 31 Support Ring Rivet 32 Inner teeth 33 Protrusion 34 screw holes 35 screw through hole 36 Slot 37 First centrifugal pendulum flange 38 Second centrifugal pendulum flange 39 Input side 40 Output side 41 Pendulum 42 Spacer bolt 43 Connection part 44 Connection hole 45 First tool through hole 46 Second Tool Through Hole A Axial direction R Radial direction U Circumferential direction D Rotational Axis

Claims

1. A torque transmission device (1) for a drive train of a motor vehicle, said torque transmission device (1) comprising an input element (5) having a threaded hole (34) for fastening to a crankshaft of an internal combustion engine of said motor vehicle, a torque limiter (3) following said input element (5), and a following output element (6) connected to said torque limiter (3) in a non-rotatable manner using a form-fit connection (13), said output element (6) being supported by a disk spring in an axial direction (A) of said torque transmission device (1) relative to said torque limiter (3). the output element (6) is held in a first position (15) by the force of a disk spring (28) and is displaceable in an axial direction (A) against the force of the disk spring (28), the output element (6) as it is displaced in the axial direction (A) can assume a second position (16) in which the form-fit connection (13) continues to exist, and the output element (6) as it is displaced in the axial direction (A) can assume a third position (17) in which the form-fit connection (13) is released and the output element (6) can rotate relative to the torque limiter (3); The torque transmission device (1), wherein the disk spring (28) is capable of limited rotation relative to the torque limiter (3) in a circumferential direction (U) of the torque transmission device (1).

2. 2. The torque transmission device (1) according to claim 1, wherein the output element (6) has at least one threaded through hole (35), the threaded through hole (35) being aligned with the threaded hole (34) of the input element (5).

3. 3. The torque transmission device (1) according to claim 1, wherein the torque limiter (3) is configured as a friction clutch.

4. 4. The torque transmission device (1) according to claim 1, wherein the form-fit connection (13) allows the output element (6) to be displaced in the axial direction (A) relative to the torque limiter (3), is arranged between the torque limiter (3) and the output element (6), and is formed as a plug-in tooth.

5. 5. The torque transmission device (1) according to claim 4, wherein the disk spring (28) is supported by a support ring (24) which is connected non-rotatably to the output side (40) of the torque limiter (3) and is preloaded against a flange portion (27) of the output element (6), the flange portion (27) being provided on its outer periphery with an external toothing (26) of the plug-in teeth.

6. The torque transmission device (1) according to claim 5, wherein the disk spring (28) is held by the support ring (24) so ​​as to be capable of limited rotation relative to the torque limiter (3) in the circumferential direction (U) of the torque transmission device (1).

7. 7. The torque transmission device (1) according to claim 6, wherein the disk spring (28) in an initial position spatially limits the displacement of the output element (6) in the axial direction (A) so as not to exceed the second position (16) at the initial position, and the disk spring (28) releases the spatial limitation at a rotated position rotated relative to the initial position, allowing the displacement of the output element (6) to the third position (17) in the axial direction (A).

8. The disc spring (28) has a long disc spring tongue (29) and a short disc spring tongue (30) on its outer periphery, and the disc spring (28) is supported by the support ring (24) by the long disc spring tongue (29) in both the initial position and the rotated position, and the disc spring (28) is supported by the short disc spring tongue (30) at the support ring (24) in the initial position, at a protrusion (33) of the support ring (24) extending inward in the radial direction (R) of the torque limiter (3), and the disc spring (28) is supported by the short disc spring tongue (30) at the support ring (24) in the initial position, and at a protrusion (33) of the support ring (24) extending inward in the radial direction (R) of the torque limiter (3), 8. A torque transmission device (1) according to claim 7, wherein the displacement of the disc spring (28) in the axial direction (A) is limited so as to spatially limit the displacement of the output element (6) so as not to exceed the second position (16), and the short disc spring tongue (30) allows the displacement of the disc spring (28) in the axial direction (A) such that, in the rotational position of the disc spring (28), the disc spring (28) is no longer supported by the support ring (24) by the protrusion (33) extending radially inwardly (R), thereby spatially releasing the displacement of the output element (6) to the third position (17).

9. 9. The torque transmission device (1) according to claim 6, wherein the output element (6) is provided with a centrifugal pendulum device (4) having at least one first centrifugal pendulum flange (37), said first centrifugal pendulum flange (37) having an opening in the form of an elongated hole (36) through which a tool can be inserted for rotating the disk spring (28).

Images