Centrifugal pendulum with a radially inner stop damper

Abstract

The invention relates to a centrifugal pendulum (1) having, on its radially inner surface (25), a stop damper (11) capable of damping the stopping process of the pendulum mass (6) on one of the pendulum flanges (2, 3). The stop damper (11) has two through openings (19) into or through which the fixing elements (17, 8) extend. As a result, the stop damper (11) is easy to mount and pre-mount on the pendulum mass (6). If the pendulum mass (6) simultaneously has one or two friction elements (12), the stop damper (11) can be fixed to the pendulum mass by means of fixing elements (17, 18) preferably formed on the friction elements (12).

Description

[Technical Field]

[0001] The present invention relates to a centrifugal pendulum with a radially inner stopping damper. The centrifugal pendulum according to the invention is used in particular in the drive train of a motor vehicle to damp or counteract torsional vibrations. [Background technology]

[0002] Centrifugal pendulums for use in automotive drivetrains are known. These centrifugal pendulums function to damp vibrations in the drivetrain and are often used in conjunction with torsional vibration dampers. A centrifugal pendulum has at least one pendulum flange and a pendulum mass that can move relative to the pendulum flange over a predetermined path of travel under centrifugal force. The configuration of the pendulum mass and path of travel ensures that specific torsional vibration frequencies in the drivetrain are damped. When the pendulum mass reaches one end of its path of travel, it impacts the end of the path of travel. This can create noise in the drivetrain and stress and possibly wear the end of the path of travel.

[0003] Stop dampers are known to reduce this problem. For example, German Patent Application No. DE 10 2015 212 737 A1 discloses a stop damper configured as an elastic ball arranged on the radially inner surface of the pendulum mass. This embodiment has the disadvantage that the size of the ball is limited by the thickness of the pendulum mass. In particular, if the pendulum mass is relatively heavy, the damping that can be achieved thereby is no longer sufficient. Summary of the Invention [Problem to be solved by the invention]

[0004] Proceeding therefrom, the object of the present invention is to at least partially overcome the problems known from the prior art. [Means for solving the problem]

[0005] This object is achieved by the features of independent claim 1. The dependent claims specify further advantageous embodiments of the invention. The features individually recited in the dependent claims can be combined with one another in a technically meaningful manner, thereby defining further embodiments of the invention. Additionally, the features recited in the claims are specified and elaborated upon in the description, where further preferred embodiments of the invention are set forth.

[0006] The centrifugal pendulum according to the invention comprises two pendulum flanges, which are fixed so as not to rotate relative to each other and which are rotatable about a rotation axis and which define a pendulum mass receiving space between them in the direction of the rotation axis, and at least one pendulum mass, which is arranged in the pendulum mass receiving space and is movable relative to the pendulum flanges along at least one movement path defined by cutouts in the pendulum flanges and the pendulum mass, the roller bodies extending through the cutouts and a stop damper formed on each pendulum mass. The centrifugal pendulum is characterized in that the stop dampers are arranged on radial inner surfaces of the pendulum masses and have at least two through openings, and that fixing elements connecting the stop dampers to the pendulum masses extend into or even through the through openings.

[0007] Centrifugal pendulums are particularly used in automotive drivetrains that have an internal combustion engine as a torque source. In addition, the drivetrain may also have one or more electric motors as torque sources. Centrifugal pendulums damp or cancel specific vibration frequencies of torsional vibrations in the drivetrain. The stop damper prevents the pendulum mass from colliding with the pendulum flange, which would cause noise and / or wear on the pendulum flange and / or the pendulum mass. Due to the arrangement of the stop damper on the radial inner surface of the pendulum mass and its connection to the pendulum mass by fastening elements extending into or through through openings, a damping effect can be achieved that is independent of the thickness of the pendulum mass, i.e., the extent of the pendulum mass's extension in the direction of the rotation axis.

[0008] The stop damper strikes against a contact portion of another component, in particular one of the pendulum flanges. The stop damper can be easily mounted on the pendulum mass, in particular pre-mounted, so that the pendulum mass can then be mounted with the stop damper attached. The pendulum mass preferably has mounting cutouts on its inner surface radial to the rotation axis, the mounting cutouts being configured to correspond to the cutouts of the stop damper.

[0009] The fixing elements preferably comprise pin connections, which are formed by pins that are oversized compared to the through openings so that a pressure-fit and form-fit connection is formed between the pins and the through openings.

[0010] The fixing elements preferably form a snap-fit ​​connection, which is particularly preferred when there are two fixing elements which engage in the through opening from both sides and form a snap-fit ​​connection with each other, in which case each fixing element preferably has a snap-fit ​​hook.

[0011] Each pendulum mass preferably has at least one friction element formed on one side of the pendulum mass in the direction of the rotation axis and mounted on the pendulum mass. The friction element is in particular made of elastic plastic and interacts regularly with a corresponding friction element on one of the pendulum flanges to provide braking of the pendulum mass against the pendulum flange. Furthermore, in an advantageous embodiment, two friction elements are formed, which are formed on opposite sides of the pendulum mass with respect to the rotation axis.

[0012] Each friction element preferably has a snap-fit ​​element as a fastening element extending into or through the through opening of the stop damper. If two friction elements are formed on opposite sides of the pendulum flange, the snap-fit ​​elements of the two friction elements preferably cooperate to form a snap-fit ​​connection at the respective through openings. This allows for easy attachment of the stop damper and the friction elements.

[0013] The snap-fit ​​element is preferably formed integrally with the friction element, which allows for easy installation of the stop damper, which can be easily manufactured with the snap-fit ​​element made of plastic, for example, using an injection molding process.

[0014] Each friction element preferably has at least two pins that engage with corresponding notches in the pendulum mass, thereby forming a pin connection for securing the friction element to the pendulum mass. The pins are preferably oversized in a plane perpendicular to the axis of rotation compared to the corresponding notches in the pendulum mass.

[0015] The stop damper is preferably at least partially made from an elastic material, in particular the damping part of the stop damper, or alternatively the entire stop damper, is made of an elastomer.

[0016] Furthermore, a torsional vibration damper is proposed, which comprises an input part, an output part and a spring device, the input part and the output part being rotatable relative to one another about an axis of rotation against the action of the spring device, and the input part and / or the output part being connected in a non-rotatably fixed manner to the centrifugal pendulum according to the invention.

[0017] Herein, the input part is preferably connected or connectable directly or indirectly to the internal combustion engine, for example via a friction clutch for coupling and decoupling the internal combustion engine to and from the drive train. The output part is preferably connected in a non-rotatably fixed manner to the centrifugal pendulum. The torsional vibration damper preferably comprises a slip clutch on its radially inner surface as a torque limiter.

[0018] It should be noted that the numerical designations used herein (such as "first," "second," etc.) primarily (and only) serve to distinguish between several similar objects, sizes, or processes, and do not specifically designate a dependency and / or sequence of these objects, sizes, or processes on one another. If a dependency and / or sequence is required, it will be apparent to one skilled in the art upon reviewing the embodiments explicitly or specifically described herein.

[0019] Both the present invention and the technical field will be described in more detail below with reference to the figures. It should be noted that the present invention is not intended to be limited by the illustrated exemplary embodiments. In particular, unless explicitly stated otherwise, partial aspects of the subject matter illustrated in the figures may be extracted and combined with other components and knowledge from this specification and / or the figures. It should be noted that the figures, and in particular the illustrated proportions, are only schematic in nature. The same reference symbols indicate the same objects, so that, where applicable, descriptions from other figures may also be used. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a cross-sectional view of a torsional vibration damper having an example centrifugal pendulum. [Figure 2] FIG. 1 is a top view of a centrifugal pendulum. [Figure 3] 1 is a diagram of various parts of a pendulum mass of a centrifugal pendulum with a friction element. FIG. [Figure 4]1 is a diagram of various parts of a pendulum mass of a centrifugal pendulum with a friction element. FIG. [Figure 5] 1 is a diagram of various parts of a pendulum mass of a centrifugal pendulum with a friction element. FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 1 is an exploded view of a pendulum mass with a friction element and a stop damper. [Figure 10] FIG. 1 is a perspective view of a pendulum mass with attached friction elements and stop dampers. DETAILED DESCRIPTION OF THE INVENTION

[0021] FIG. 1 is a cross-sectional view of a torsional vibration damper 100. The torsional vibration damper 100 includes an input section 101 and an output section 102. The input section 101 and the output section 102 can rotate relative to each other about a rotation axis 104 against the action of a spring device 103. The input section is preferably connected directly or indirectly to an output shaft (not shown) of an internal combustion engine (not shown). A direct connection can be achieved, for example, by connecting the input section 101 to the crankshaft or flywheel of the internal combustion engine in a non-rotatably fixed manner. An indirect connection can be achieved by forming at least one additional element, such as a friction clutch, between the internal combustion engine and the torsional vibration damper 100.

[0022] The centrifugal pendulum 1 is connected in a fixed and non-rotatable manner to the output part 102 of the torsional vibration damper 100. The centrifugal pendulum 1 comprises a first pendulum flange 2 and a second pendulum flange 3, which can rotate about an axis of rotation 4 corresponding to the axis of rotation 104. The first pendulum flange 2 and the second pendulum flange 3 are connected to each other in a fixed and non-rotatable manner and define a pendulum mass receiving space 5 in the direction of the axis of rotation 4 between the first pendulum flange 2 and the second pendulum flange 3.

[0023] FIG. 2 is a top view of the centrifugal pendulum 1 of FIG. 1, viewed from the right. FIG. 2 shows only a portion of the second pendulum flange 3, as the pendulum masses 6 are located in the direction of the rotation axis 4 between the first pendulum flange 2 and the second pendulum flange 3. Overall, this example centrifugal pendulum 1 has three pendulum masses 6, which are evenly distributed around the circumference and lie in a common plane perpendicular to the rotation axis 4. Like the first pendulum flange 2, the second pendulum flange 3 also has a notch 7, while each pendulum mass 6 has a notch 8. Roller elements 9 are formed in the notches 7, 8 and allow the pendulum masses 6 to move relative to the first pendulum flange 2 and the second pendulum flange 3 in order to attenuate specific frequencies. The roller body 9 moves in the notches 7, 8 which form a movement path 10, which is defined in such a way as to allow the desired pendulum movement induced from the centrifugal force of the pendulum mass 6 against the pendulum flanges 2, 3.

[0024] On its radially inner surface, each pendulum mass 6 has a stop damper 11. The pendulum mass 6, the stop damper 11 and the second pendulum flange 3 are configured in such a way that the stop damper 11 damps the movement of the pendulum mass 6 at maximum deflection of the pendulum mass 6. By configuration on the radially inner surface, we mean that in the undeflected state as shown in Figure 2, the stop damper 11 projects radially inwardly beyond the pendulum mass 6 with respect to the rotation axis 4, so that contact can only occur with the stop damper 11 on the radial inner surface, but not with the pendulum mass 6. The stop damper 11 is preferably made of an elastic material.

[0025] A preferred example of the stopping damper 11 and its attachment to the pendulum mass 6 will be described below with particular reference to Figures 3 to 8. Unless expressly stated otherwise, these Figures will be described together below. Figures 3 to 6 show various parts of the pendulum mass 6. Figure 3 shows the part indicated as "III-III" in Figure 4, Figure 4 shows the part indicated as "IV-IV" in Figure 3, and Figure 5 shows the part indicated as "VV" in Figure 3.

[0026] In this example, the pendulum mass 6 is provided with two friction elements 12, which are mounted on longitudinal sides 13 of the pendulum mass that are opposite in the direction of the rotation axis 4. The friction elements 12 are shown in a perspective view in FIG. 6. The friction elements 12 have pins 14, three in this example. The friction elements 12 are connected to the pendulum mass 6 via the pins 14, which are press-fit into corresponding cutouts 15 in the pendulum mass 6, thus forming a form-fit and pressure-fit connection between the friction elements 12 and the pendulum mass 6. The pins 14 are appropriately oversized for the corresponding cutouts 15. The friction elements 12 also have cutouts 16 that correspond to the cutouts 8 of the pendulum mass 6 to form the movement path 10.

[0027] Furthermore, the friction elements 12 have two fixing elements 17 on their radially inner surface 27, which are configured as snap-fit ​​elements 18 with corresponding snap-fit ​​hooks 26. The stop damper 11 (see in particular Figures 7 and 8) has through openings 19, the position and spacing of which are selected so that the fixing means 17 engage through the through openings 19 when the friction elements 12, together with the stop damper 11, are mounted on the pendulum mass 6. In this example (see in particular Figure 5), two friction elements 12 are formed per pendulum mass 6, so that during assembly the snap-fit ​​hooks 18 of the two friction elements 12 extend through the through openings 19 of the stop damper 11 and form a snap-fit ​​connection.

[0028] When installed, the stop damper 11 has an outer surface 20 and an inner surface 21 that are convex in the radial direction relative to the rotation axis 4. The outer surface 20 corresponds to the mounting cutout 22 of the pendulum mass 6 (see in particular FIG. 3). The inner surface 21 has a damping portion 23 that, in particular, contacts a contact portion 24 of the second pendulum flange 3 to provide the damping function (see FIG. 1). The damping portion 23 has two recesses 28 whose positions correspond to the positions of the through-openings 19. This reduces the forces introduced into the area of ​​the through-openings 19 and thus into the area of ​​the fixing element 17 formed in the through-openings 19 upon impact of the shock damper 11, thereby protecting the fixing element 17 during operation.

[0029] Figure 9 is an exploded view of the pendulum mass 6 with the friction element 12, stop damper 11, and roller element 9. The radially inner surface 25 on which the mounting notch 22 is formed is shown on the pendulum mass 6. Figure 10 is a perspective view of the pendulum mass 6 with the friction element 12 and roller element 9 attached.

[0030] The centrifugal pendulum 1 has a stop damper 11 on its radial inner surface 25, which damps the stopping process of the pendulum mass 6 on one of the pendulum flanges 2, 3. The stop damper 11 has two through-openings 19 into which or through which the fixing elements 17, 18 extend. This allows the stop damper 11 to be easily mounted and pre-mounted on the pendulum mass 6. If the pendulum mass 6 simultaneously has one or two friction elements 12, the stop damper 11 can be fixed to the pendulum mass 6 by means of the fixing elements 17, 18, which are preferably formed on the friction elements 12. [Explanation of symbols]

[0031] 1. Centrifugal Pendulum 2 First pendulum flange 3 Second pendulum flange 4 rotation axes 5 Pendulum mass receptive space 6 Pendulum Mass 7 Notch 8 Notch 9 Roller body 10. Travel Route 11 Stop Damper 12 Friction elements 13 Longitudinal side 14-pin 15 Notch 16 Radial inner surface 17 Fixed Elements 18 Snap Fit Hooks 19 Through opening 20 Exterior 21 Inner 22 Mounting notch 23 Attenuation part 24 Contact area 25 Radial inner surface 26 Snap Fit Hooks 27 Radial inner surface 28 depression 100 Torsional vibration damper 101 Input section 102 Output section 103 Spring device 104 Rotational Axis

Claims

1. A centrifugal pendulum (1) comprising two pendulum flanges (2, 3) fixed so as not to rotate relative to one another and rotatable about a rotation axis (4), defining a pendulum mass receiving space (5) between the pendulum flanges (2, 3) in the direction of the rotation axis (4), and at least one pendulum mass (6) arranged in the pendulum mass receiving space (5), with at least one movement path (10) defined by cutouts (7, 8) in the pendulum flanges (2, 3) and the pendulum mass (6). and at least one pendulum mass (6) movable relative to the pendulum flanges (2, 3) on the roller bodies (9), the roller bodies (9) extending through the cutouts (7, 8), and a stop damper (11) formed on each pendulum mass (6), the stop damper (11) being arranged on a radial inner surface (25) of the pendulum mass (6) and having at least two through openings (19), and fixing elements (17, 18) connecting the stop damper (11) to the pendulum mass (6) extending into the through openings (19), Each pendulum mass (6) has at least one friction element (12), which is formed on one side of the pendulum mass (6) in the direction of the rotation axis (4) and is mounted on the pendulum mass (6); A centrifugal pendulum (1) characterized in that each friction element (12) has a snap-fit ​​element (18) as a fixing element (17) extending into the through opening (19) of the stop damper (11).

2. 2. The centrifugal pendulum (1) according to claim 1, wherein the fixing element (17) comprises a pin connection.

3. 2. The centrifugal pendulum (1) according to claim 1, wherein the fixing elements (17, 18) form a snap-fit ​​connection.

4. 2. The centrifugal pendulum (1) according to claim 1, wherein the snap-fit ​​element (18) is formed integrally with the friction element (12).

5. 2. A centrifugal pendulum (1) according to claim 1, wherein each friction element (12) has at least two pins (14) which engage in corresponding notches (15) of the pendulum mass (6).

6. 2. The centrifugal pendulum (1) according to claim 1, wherein the stopping damper (11) is at least partially made of an elastic material.

7. 1. A torsional vibration damper (100) comprising an input part (101), an output part (102) and a spring device (103), wherein the input part (101) and the output part (102) are rotatable relative to one another about a rotation axis (104, 4) against the action of the spring device (103), and wherein the input part (101) and / or the output part (102) are connected in a non-rotatably fixed manner to a centrifugal pendulum (1) according to claim 1.

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