Centrifugal force pendulum and torsional vibration damper having the same

Abstract

A centrifugal pendulum (1) and a torsional vibration damper having the centrifugal pendulum, the centrifugal pendulum having a pendulum flange (2) arranged so as to be rotatable about a rotation axis (d) and a pendulum mass (3) received on the pendulum flange so as to be oscillating along a predetermined pendulum path in a centrifugal field of the pendulum flange rotatable about the rotation axis (d) by means of two pendulum bearings (8) spaced apart in the circumferential direction, the pendulum mass consisting of an intermediate block (6) received in a recess (5) of the pendulum flange and forming the pendulum bearing (8) together with the pendulum flange, and a mass disk (4) arranged on both sides of the pendulum flange and connected to the intermediate block. In order to reduce the axial installation space of the centrifugal pendulum and thus the torsional vibration damper having the centrifugal pendulum or to increase its ability to isolate torsional vibrations, the recess has a through-hole (16) radially outwardly, into which a radially widened portion (18) of the intermediate block extends.

Description

Technical Field

[0001] The present invention relates to a centrifugal pendulum and a torsional vibration damper having the centrifugal pendulum, the centrifugal pendulum comprising a pendulum flange arranged so as to be rotatable about a rotation axis and a pendulum mass received on the pendulum flange so as to be able to swing along a predetermined pendulum path in a centrifugal force field of a pendulum flange rotating about the rotation axis by means of two pendulum bearings spaced apart in the circumferential direction, wherein the pendulum mass is formed by an intermediate block received in a recess of the pendulum flange and forming a pendulum bearing together with the pendulum flange, and a mass disk arranged on both sides of the pendulum flange and connected to the intermediate block respectively. Background Art

[0002] This type of centrifugal pendulum is known from document DE 10 2017 124 005 A1, which has a pendulum flange and a pendulum mass that can be accommodated in a centrifugal field along a pendulum track relative to the pendulum flange. The pendulum mass is composed of an intermediate block and a mass disk. The intermediate block is accommodated in a closed recess and forms two pendulum bearings spaced apart in the circumferential direction with the guide rails made on the wall of the recess, wherein complementary guide rails are made on the intermediate block in the same axial plane and radially inside the guide rails, and pendulum rollers roll on the radially opposite guide rails. The mass disks that overlap the recess on both sides of the pendulum flange are connected to the intermediate block.

[0003] Furthermore, a torsional vibration damper for torsional vibration isolation by means of a spring device for transmitting torque from an input member to an output member is known, wherein a centrifugal pendulum is connected downstream in order to improve the degree of isolation of the spring device. The arrangement of the centrifugal pendulum can be, for example, as shown in document DE 10 2013 205 675 A1, provided with a pendulum mass arranged substantially at the same radial height as the spring device outside an annular chamber for receiving the spring device. Alternatively, as in documents DE 10 2018 113 085 A1 and DE 10 2018 124 735 A1, the centrifugal pendulum can be received radially inside the annular chamber and axially in the installation space of the spring device or axially spaced from the spring device. Summary of the invention

[0004] The object of the present invention is to provide a centrifugal pendulum and a development of a torsional vibration damper having a centrifugal pendulum. In particular, the object of the present invention is to provide a centrifugal pendulum which is narrow in the axial direction or has an improved degree of isolation due to the increased mass of the pendulum mass and a torsional vibration damper having such a centrifugal pendulum.

[0005] The proposed centrifugal pendulum comprises a pendulum flange arranged around an axis of rotation, on which pendulum masses distributed in the circumferential direction are arranged, which are received on the pendulum flange by means of pendulum bearings. The pendulum bearings are formed by complementary guideways in the pendulum flange and in the pendulum mass, on which pendulum rollers roll. The selection of the curvature of the guideway (which predetermines the corresponding pendulum track of the pendulum mass), the design of the pendulum rollers, the distance of the center of gravity of the pendulum mass from the axis of rotation and the like predetermine the properties of the centrifugal pendulum, in particular the damping step with respect to the main excitation step of the internal combustion engine. Here, due to the pendulum flange rotating around the axis of rotation, the pendulum mass is accelerated radially outward in the centrifugal field and is transferred by torsional vibrations to a smaller radius that damps the torsional vibrations, so that the torque acting on the pendulum mass support is damped in a manner dependent on the centrifugal force and therefore adapted to the number of revolutions.

[0006] The pendulum mass comprises an intermediate block which is placed in a recess of a pendulum flange, wherein, in order to form preferably two pendulum bearings spaced apart in the circumferential direction, guide rails in the recess and on the intermediate block are arranged in the same axial plane and radially one above the other. Here, the pendulum roller rolls between the pendulum flange and the guide rails of the intermediate block in the axial installation space of the pendulum flange. Due to the radial intersection of the recess with the mass disk arranged on both sides on the pendulum flange, connected to the intermediate block, and in one piece or in a multi-piece stack, the pendulum roller is captively received in the corresponding pendulum bearing.

[0007] In order to increase the mass of the pendulum mass without requiring additional installation space and thus improving the degree of isolation of the centrifugal pendulum or to produce a centrifugal pendulum that is axially narrower while maintaining the same degree of isolation, the recess has a through-hole radially outwardly, into which the radial expansion of the intermediate block extends. By radial expansion of the intermediate block, which is limited in the circumferential direction relative to the through-hole so that the set oscillation angle of the pendulum mass along the pendulum mass remains constant, the total mass of the pendulum mass and thus the degree of isolation of the centrifugal pendulum can be increased without, for example, expanding the centrifugal pendulum in the axial direction by thickening the mass disk. In this case, the radial installation space of the expansion is limited only by radial boundaries formed by other components of the environment of the centrifugal pendulum. In this case, it can be advantageous to expand the expansion radially outwardly of the outer circumference of the pendulum flange in the circumferential direction in order to achieve an additional increase in the mass of the pendulum mass.

[0008] For example, the opening can be arranged in a preferred manner centrally between the two pendulum bearings of the pendulum mass in the circumferential direction. For example, a pendulum flange-side guide rail of one of the pendulum bearings can be arranged on the projections generated by the opening and directed toward each other in the circumferential direction. For this purpose, a pendulum mass-side guide rail can be arranged on the intermediate block, which is opposite to the pendulum flange-side guide rail and is arranged radially inside the pendulum flange-side guide rail. Here, the pendulum rollers roll on the radially opposite guide rails. The guide rails and pendulum rollers of the pendulum bearings constructed in this way are arranged in the same plane in the axial direction and can therefore be constructed to be narrow in the axial direction.

[0009] In order to protect the pendulum roller from impermissible movements, in particular when so-called impacts with large peak moments are introduced into the centrifugal pendulum, the pendulum roller can be guided with play relative to the pendulum mass by means of end-side pins that fit in elongated holes configured correspondingly to the pendulum track. The elongated holes are designed in an arc shape with a minimum radially inner portion, so that when the pendulum mass is displaced relative to the pendulum flange between the end positions of the pendulum track, the pendulum roller performs a corresponding movement.

[0010] According to a particularly advantageous embodiment, the pendulum mass can be received in two segments on the pendulum flange. Other segments, such as three or four segments, are also encompassed by the concept of the invention.

[0011] The object is also achieved by a torsional vibration damper having an input part that can be rotated about an axis of rotation and an output part that can be rotated relative to the input part about the axis of rotation counter to the action of a spring device, the output part having the proposed centrifugal force pendulum. The torsional vibration damper can be designed as a dual-mass flywheel with an output part as an output hub, which is connected in a rotationally locked manner to a downstream drive train device (e.g. a dual clutch) that takes on at least part of the secondary flywheel mass or a friction clutch arranged on the output part. The torsional vibration damper can also be designed as a clutch disk of a friction clutch, as a torsional vibration damper inside a hydrodynamic torque converter, as a pulley damper and / or the like.

[0012] Here, an advantageous embodiment of the torsional vibration damper provides an output member and a centrifugal pendulum received on the output member, wherein the proposed centrifugal pendulum is arranged on the output side outside the annular chamber that receives the spring device. Here, the centrifugal pendulum runs dry and the pendulum mass is preferably arranged at the radial height of the spring device and axially spaced apart from the spring device. It is understood that in order to save axial installation space, the pendulum mass can also be arranged radially inside the spring device and at least partially axially intersecting the spring device, wherein the annular chamber is correspondingly delimited radially inwardly on the side of the centrifugal pendulum.

[0013] In another embodiment, the torsional vibration damper is provided with an input part that can be rotated about an axis of rotation and an output part that can be arranged relative to the input part and can be rotated about the axis of rotation in opposition to the action of the spring device, wherein the proposed centrifugal force pendulum is arranged radially inside the spring device and inside the annular cavity. For example, the pendulum flange can be formed by a flange part that is connected to the output hub, for example in one piece or in parts, and which loads the spring device radially outside on the output side. In this case, the arms that load the spring device are respectively arranged in the circumferential direction between the openings of the pendulum flange, so that the division of the helical compression spring (for example, a curved spring) that forms the spring device and the division of the pendulum mass are the same.

[0014] According to another advantageous embodiment of a torsional vibration damper having an input part that can be twisted about an axis of rotation and an output part that can be arranged relative to the input part and can be twisted about the axis of rotation in opposition to the action of a spring device, the proposed centrifugal force pendulum can be received in an annular cavity that receives the spring device, spaced axially from the spring device. In this case, in order to achieve an axially narrow installation space, the centrifugal force pendulum is arranged essentially radially inside the spring device and can at least partially intersect the spring device in the radial direction. The centrifugal force pendulum can face the drive side or the driven side relative to a section extending through the spring device and arranged perpendicular to the axis of rotation. In this case, for example, a disk of the input part connected to the crankshaft of the internal combustion engine constitutes the drive side and for example, an output hub of the output part constitutes the driven side. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] According to Figures 1 to 5 The embodiment shown in the figure explains the present invention in more detail. It shows:

[0016] Figure 1 Partial view of the centrifugal pendulum,

[0017] Figure 2 Figure 1 The pendulum flange of the centrifugal pendulum,

[0018] Figure 3 The upper part of the torsional vibration damper is arranged in cross section about the axis of rotation and has Figure 1 The centrifugal force pendulum,

[0019] Figure 4 In cross section relative to Figure 3 The upper part of the torsional vibration damper which is arranged so as to be rotatable about the rotation axis and has a Figure 1 The centrifugal force pendulum, and

[0020] Figure 5 In cross section relative to Figure 3 and 4The upper part of the torsional vibration damper which is arranged so as to be rotatable about the rotation axis and has a Figure 1 The centrifugal force pendulum. DETAILED DESCRIPTION

[0021] Figure 1 A centrifugal pendulum 1 is shown in a partial view, which has a pendulum flange 2 arranged so as to be rotatable about an axis of rotation and pendulum masses 3 arranged on the pendulum flange in a distributed manner in the circumferential direction. The pendulum masses 3 are each composed of two mass disks 4 arranged on both sides of the pendulum flange 2 and an intermediate mass 6 received in a recess 5 of the pendulum flange 2 in the plane of the pendulum flange 2, the mass disks and the intermediate mass being connected to one another by means of rivets 7. For a better view, the front mass disk 4 has been removed.

[0022] The pendulum mass 3 can be accommodated on the pendulum flange 2 in a swingable manner in the centrifugal force field of the pendulum flange 2 rotating about the axis of rotation by means of two pendulum bearings 8 spaced apart in the circumferential direction. The pendulum bearings 8 are respectively composed of guide rails 9, 10 made on the pendulum flange 2 and the intermediate block 6 and pendulum rollers 11 rolling thereon. The pendulum rollers 11 are captively accommodated between the mass disks 4 and are guided with play in the elongated holes 13 of the mass disk 4 by means of bolts 12 extending at the end sides.

[0023] The intermediate block 6 has radially inside a stop buffer 14 extending in the circumferential direction, preferably made of plastic or rubber, which is connected to the intermediate block by means of a pin 15. The stop buffer 14 prevents the intermediate block 6 from metallically stopping against the wall and from making noises when the pendulum mass 3 is not sufficiently held on the pendulum bearing 8 by centrifugal force. The contours of the intermediate block 6, the recess 5 and the stop buffer 14 imitate the pendulum path of the pendulum mass.

[0024] The recess 5 has an opening 16 radially on the outside in the circumferential direction between the pendulum bearings 8. The projections 17 remaining on both sides of the opening 16 contain the guide rails 9, wherein the projections 17 are arranged statically in accordance with the centrifugal force loads acting on them by the pendulum masses 3.

[0025] In the respective openings 16, the expansion 18 of the intermediate piece 6 extends radially outwards, so that the mass of the pendulum mass is increased overall without affecting the installation space and the degree of isolation of the centrifugal pendulum 1 can be increased. The radial expansion 18 is adapted in its circumferential direction to the oscillation angle of the pendulum mass 3 between the two end positions and can serve as a hard stop for the projection 17 relative to the end positions, such as the end position shown, in order to protect the stop buffer 14 in the event of excessive loads due to impacts.

[0026] Figure 2 Shown in view Figure 1The invention discloses a centrifugal pendulum 1 of a pendulum flange 2 that can be rotated about an axis of rotation d. The pendulum flange 2 is designed to have two pendulum masses that are opposite to each other for two parts and has a recess 5 that is open radially to the outside and includes a through-hole 16 and a projection 17 including a guide rail 9. The opening 19 is used to reduce the mass of the pendulum flange 2 that is ineffective for torsional vibration damping adapted to the number of revolutions. The opening 20 is used to fix the centrifugal pendulum in a drive train device, such as a torsional vibration damper. The pendulum flange 2 can be configured to configure additional functional areas in a modified design, for example, radially extending arms of a spring device for loading the torsional vibration damper are provided between the recesses 5 in the circumferential direction.

[0027] Figure 3 The upper part of a torsional vibration damper 100 which is arranged to be rotatable about an axis of rotation d is shown in cross section. The torsional vibration damper 100 comprises an input member 101 and an output member 102 and a spring device 103 which acts in the circumferential direction between them and is composed of arc springs 104 which are arranged distributed in the circumferential direction. The arc springs 104 are placed in an annular cavity 105 formed by the input member 101. The output member 102 is arranged with a spring device 103 which is arranged distributed in the circumferential direction. Figure 1 A centrifugal pendulum 1 with a pendulum flange 2 is shown, wherein a pendulum mass (not shown) is arranged in an axial installation space-saving manner in the axial direction in an axial installation space 106. Here, the pendulum mass is arranged substantially at the radial height of the spring device 103 and is arranged axially spaced apart therefrom outside the annular chamber 105. Radially outside the axial installation space 106, a burst protection 107 is connected to the input member 101.

[0028] The pendulum flange 2 is connected to the flange part 108 for loading the spring device 103 and the output hub 109 on the output side.

[0029] Figure 4 The cross section shows the structure which is arranged to rotate about the rotation axis d relative to the Figure 3 The torsional vibration damper 100 is changed to the upper portion of the torsional vibration damper 200. Different from the torsional vibration damper 100, Figure 1 The centrifugal pendulum 1 is arranged radially inside the spring device 203 and in the annular chamber 205 formed by the input member 201. The arc spring 204 of the spring device 203 is arranged in two parts. The pendulum flange 2 of the centrifugal pendulum 1, which is configured as a flange member 208, has two radially extended arms 210 for this purpose so as to load the arc spring 204 on the output side. The arms extend between the two recesses of the pendulum flange 2 when viewed in the circumferential direction, and a pendulum mass is arranged in two parts and placed in the installation space 206 on the recess. The pendulum flange 2 is connected to the output hub 209 by forming the output member 202.

[0030] Figure 5The upper part of a torsional vibration damper 300 which is arranged so as to be rotatable about an axis of rotation d is shown in section. Figure 3 and 4 Torsional vibration damper 100, 200, Figure 1 The centrifugal pendulum 1 is arranged in an annular cavity 305 formed by an input member 301, on the axial side of the spring device, facing the fixed side of the torsional vibration damper on the crankshaft of the internal combustion engine. The installation space 306 for the pendulum mass of the centrifugal pendulum 1 intersects the arc spring 304 of the spring device 303 in the radial direction and the axial direction. The pendulum flange 2 of the centrifugal pendulum 1 is connected to the flange member 308 so as to load the arc spring 304 on the output side and load the output hub 309 for forming the output member 302.

[0031] Reference numerals list

[0032] 1 Centrifugal Pendulum

[0033] 2 swing flange

[0034] 3 Pendulum quality

[0035] 4 quality discs

[0036] 5 hollow

[0037] 6 Middle Block

[0038] 7 Rivets

[0039] 8. Pendulum bearing

[0040] 9 rails

[0041] 10 rails

[0042] 11 Swing roller

[0043] 12 bolts

[0044] 13 Long holes

[0045] 14 Stop buffer

[0046] 15 pins

[0047] 16 hole

[0048] 17 Protrusion

[0049] 18 Extension

[0050] 19 Opening

[0051] 20 openings

[0052] 100 Torsional Vibration Damper

[0053] 101 Input

[0054] 102 output parts

[0055] 103 Spring device

[0056] 104 arc spring

[0057] 105 Ring Cavity

[0058] 106 Installation Space

[0059] 107 Explosion Protection

[0060] 108 flange

[0061] 109 output hub

[0062] 200 Torsional Vibration Damper

[0063] 201 Input

[0064] 202 output

[0065] 203 Spring device

[0066] 204 arc spring

[0067] 205 Ring Cavity

[0068] 206 installation space

[0069] 208 flange

[0070] 209 output hub

[0071] 210 Arm

[0072] 300 Torsional Vibration Damper

[0073] 301 Input

[0074] 302 output

[0075] 303 Spring Device

[0076] 304 arc spring

[0077] 305 Ring Cavity

[0078] 306 installation space

[0079] 308 flange

[0080] 309 output hub

[0081] dRotation axis

Claims

1. A centrifugal pendulum (1), comprising a pendulum flange (2) arranged so as to be rotatable about an axis of rotation (d) and a pendulum mass (3) received on the pendulum flange so as to be swivellable along a predetermined pendulum path in a centrifugal field of the pendulum flange (2) rotatable about the axis of rotation (d) by means of two pendulum bearings (8) spaced apart in the circumferential direction, wherein: The pendulum mass (3) is composed of an intermediate piece (6) received in a recess (5) of the pendulum flange (2) and forming the pendulum bearing (8) together with the pendulum flange, and a mass disk (4) arranged on both sides of the pendulum flange (2) and connected to the intermediate piece (6) in each case, characterized in that the recess (5) has a through-opening (16) radially outwardly, into which a radial widening (18) of the intermediate piece (6) extends, and the pendulum roller (11) is guided with play relative to the pendulum mass (3) by means of end-side pins (12) which engage in elongated holes (13) of the mass disk (4) configured corresponding to the pendulum track.

2. The centrifugal pendulum (1) according to claim 1, characterized in that: The apertures (16) are arranged in the circumferential direction respectively between two pendulum bearings (8) of the pendulum mass (3).

3. The centrifugal pendulum (1) according to claim 1 or 2, characterized in that: A guide rail (9) on the pendulum flange side of one of the pendulum bearings (8) is arranged on projections (17) generated by the apertures (16) and directed toward each other in the circumferential direction.

4. The centrifugal pendulum (1) according to claim 3, characterized in that: A pendulum mass-side guide rail (10) is arranged on the intermediate block (6), opposite the pendulum flange-side guide rail (9) and arranged radially inwardly of the pendulum flange-side guide rail.

5. The centrifugal pendulum (1) according to claim 4, characterized in that: The respective pendulum rollers (11) roll on radially opposite guide rails (9) on the pendulum flange side and guide rails (10) on the pendulum mass side.

6. The centrifugal pendulum (1) according to claim 1 or 2, characterized in that: The pendulum mass (3) is received in two parts on the pendulum flange (2).

7. A torsional vibration damper (100, 200, 300), comprising an input member (101, 201, 301) which can be rotated about a rotation axis (d) and an output member (102, 202, 302) which can be relatively rotated relative to the input member (101, 201, 301) about the rotation axis (d) in opposition to the action of a spring device (103, 203, 303), characterized in that: The centrifugal pendulum (1) according to any one of claims 1 to 6 is arranged on the output side in association with the output element (102, 202, 302).

8. The torsional vibration damper (100, 200, 300) according to claim 7, characterized in that: The centrifugal pendulum (1) is arranged outside or inside an annular chamber (105, 205, 305) that receives the spring device (103, 203, 303).

9. The torsional vibration damper (100, 200, 300) according to claim 7 or 8, characterized in that: The pendulum mass (3) of the centrifugal pendulum (1) is received radially inside the spring device (103, 203, 303) or at the same height as the spring device (103, 203, 303) in the radial direction.

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