EP3593008A1

EP3593008A1 - Centrifugal pendulum and drive arrangement for a motor vehicle

Info

Publication number: EP3593008A1
Application number: EP18707622.9A
Authority: EP
Inventors: Björn Sieg; Steffen Lehmann; Evgenij Franz; Timm GMEINER; Martin HÄSSLER; Alain Rusch
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2017-03-09
Filing date: 2018-02-13
Publication date: 2020-01-15
Also published as: KR102523620B1; DE202018006321U1; DE102017104968A1; CN110382907A; WO2018161992A1; DE102017104968B4; KR20190124231A; CN110382907B

Abstract

The invention relates to a centrifugal pendulum for damping torsional vibrations having at least one pendulum flange (20) rotatable about a rotational axis (1) and a plurality of pendulum masses (10) slidably arranged on the pendulum flange (20) each for the execution of an oscillating movement (2) running substantially normal to the rotational axis, wherein a contact element (40), in particular a plastic element, is securely mechanically connected to each pendulum mass (10) and the centrifugal pendulum has at least one friction device (30) with which a normal force (Fn) acting substantially parallel to the rotational axis is created on each contact element (40), such that, on a movement of the pendulum mass (10) by reason of the loading with the first normal force (Fn), a frictional force (Fr) acting in opposition to this movement is generated on the contact element (40) of the particular pendulum mass (10). The centrifugal pendulum according to the invention proposed here can efficiently reduce or eliminate torsional vibrations, particularly in the drive trains of vehicles driven by internal combustion engine.

Description

Centrifugal pendulum and drive arrangement for a motor vehicle

The invention relates to a centrifugal pendulum for damping torsional vibrations and a drive arrangement for a motor vehicle, which comprises the centrifugal pendulum according to the invention.

Centrifugal pendulum contain at least one rotatable about a rotation axis pendulum and swing pendulum suspended there pendulum masses. These

Pendulum masses perform in the field of centrifugal acceleration vibrations on predetermined paths. Thus, they can Drehgleichuniformitäten, for example, by the torsional vibration-prone operation of

Internal combustion engines

be registered by being vibrated by themselves. These vibrations make the exciter vibration

Deprived of energy or supplied with energy, so it too

a calming or reduction of the oscillation amplitude of the excitation oscillation comes. The centrifugal pendulum acts as a result of increasing centrifugal force at increasing speeds as speed-adaptive torsional vibration damper, since both the natural frequency of the centrifugal pendulum oscillation and the excitation frequency are proportional to the speed.

From the prior art is that disclosed in DE 102006028552 A1

Coupling device with a clutch disc known which comprises a clutch hub. To the coupling device, in particular with regard to the im

built-in state of the coupling device occurring during operation

To optimize noise, is a pendulum mass support means of a centrifugal pendulum device comprising a plurality of pendulum masses, which at the

Pendulum mass support means are mounted relative to this movable, coupled to the clutch disc. The pendulum masses are on both sides of one

Flange element attached to this limited movable. At low speeds and the high occurring

Torque fluctuations of an internal combustion engine can cause it to hit the pendulum masses at the boundary of the resonant space. The function of a centrifugal pendulum is lost, so that no vibration isolation is given more.

In DE10201321 1391 are a speed-adaptive vibration damper and a

Torsional vibration damper disclosed with the vibration damper. The speed-adaptive vibration damper is equipped with a disc part rotating about an axis of rotation and a plurality of oscillating absorber masses arranged on the circumference along a first oscillation angle forced along an epicyclic first pendulum track to a predetermined first pendulum order. It is a center of gravity train with two pendulum orders

provided, wherein the second pendulum order is smaller than the first pendulum order. Since the second order no longer coincides with the motor excitation, the oscillation amplitude of the pendulum masses decreases.

Another way to reduce the amplitudes of the oscillatory movements of the pendulum masses is the generation of friction between pendulum masses and a carrier.

In DE102010049553 A1 discloses that in a centrifugal pendulum device, which is designed in particular for use in a drive train of a motor vehicle, with several pendulum masses which are mounted on a pendulum carrier and movable relative thereto, the operation of the

Centrifugal pendulum device is limited to a speed range above a minimum speed. This is achieved by a means that is at least one

Pendulum mass decelerates in its motion as a function of the speed. The effective direction of this agent is here radially on the pendulum mass.

In DE 10201421 171 1 A1 or WO2015192846 A1 is a centrifugal pendulum with a rotatable about a rotation axis pendulum and distributed over the circumference, in the pendulum in the centrifugal force field of the rotating pendulum pendulum hinged pendulum revealed. To prevent hard stops of the pendulum on the pendulum, the pendulum are biased axially against the pendulum. In this way, the pendulum masses can be kept in their radial positions by gravity under centrifugal force.

Proceeding from this, the present invention has the object to provide a centrifugal pendulum available, which provides a reliable eradication of excitation oscillations with a cost-effective design and a long

Lifetime combined.

This object is achieved by the centrifugal pendulum according to the invention according to claim 1 and in addition by the drive arrangement mentioned in claim 10 with the centrifugal pendulum. Advantageous embodiments of the invention

Centrifugal pendulum are given in the dependent claims 2-9. The features of the claims may be combined in any technically meaningful manner, for which purpose the explanations of the following description as well as features of the figures may be consulted which comprise additional embodiments of the invention. The terms radial, axial and circumferential direction in the context of the present invention always refer to the axis of rotation of the centrifugal pendulum.

The invention relates to a centrifugal pendulum for damping torsional vibrations, with at least one pendulum flange rotatable about a rotation axis and a plurality of oscillating masses displaceably arranged on the pendulum flange for executing a substantially perpendicular to the axis of rotation

Oscillatory motion. With a respective pendulum mass is a contact element, in particular a plastic element, mechanically firmly connected. The

Centrifugal pendulum has at least one friction device, with each one, acting in parallel to the axis of rotation normal force to a respective

Contact element is realized, so that upon movement of the pendulum mass on ground the load is generated with the normal force of the movement counteracting frictional force on the contact element of the respective pendulum mass.

In particular, the pendulum masses can be suspended pendelbar.

The contact element is mechanically, positively and / or materially mechanically connected to the pendulum mass, so that in any case there is a firm or rigid connection between the body of the pendulum mass and the contact element.

The applied by the friction device normal force acts substantially parallel to the axis of rotation and thus perpendicular to the direction of movement of the pendulum mass or perpendicular to a tangent of a rotational movement of the pendulum mass.

Due to the frictional force, the movement of the contact element and due to the mechanical connection of the contact element with the pendulum mass and the oscillatory motion of the pendulum mass itself braked and therefore damped a vibration amplitude of the pendulum mass.

A translational relative movement thus takes place between the moving contact element or the associated pendulum mass on the one hand and

on the other hand a rotationally fixed element instead, such as the friction device itself or the pendulum flange.

Due to the fact that during the movement of the pendulum mass whose distance to the friction device does not change, the pendulum mass or the contact element is subjected to a substantially constant normal force, so that a substantially constant friction force is formed.

Preferably, the friction device is designed substantially annular.

With an annular friction device can thus be applied substantially parallel to the axis of rotation in each case a force on all arranged pendulum masses or on the pendulum masses associated contact elements, so that when moving a pendulum mass, a frictional force on the pendulum mass or on this pendulum mass associated contact element against Movement of the pendulum mass works.

In this case, the friction device may have deviations from a circular ring shape in detail. In one embodiment of the centrifugal pendulum pendulum is provided that a respective pendulum mass has at least partially on its surface the contact element on which the force applied by the friction device normal force acts.

The resulting from the normal force frictional force thus acts between the

Friction device itself and the contact element.

In this embodiment, it is advisable that the contact element is formed by a plastic sheath which partially encloses the respective pendulum mass. That is, here e.g. a metal core of the pendulum mass is coated with plastic. In this case, this envelope may have different wall thicknesses on the opposite sides of the pendulum mass.

The friction device may in particular be a bending spring, such as an annular leaf spring, with which the normal force is effected on a respective contact element. Such an annular bending spring or leaf spring is also known as

Corrugated plate designated and is preferably made of a spring steel.

The spiral spring can be supported on the pendulum flange and have a plurality of convex portions extending in the axial direction, wherein at least one convex portion bears against the contact element of a respective pendulum mass and presses against it. In this way, the axially parallel acting normal forces are applied to the pendulum masses via the convex areas, which lead to the vibration-damping frictional forces. Sections of the spiral spring located between the convex portions are supported axially on the pendulum flange. That means that the

Friction on the one hand acts on the contact element of a respective pendulum mass and on the other hand is supported on a pendulum. The pendulum flange thus brings the corresponding counterforce to the normal force.

Thus, for example, the bending spring on the circumference as convex portions have three evenly distributed, axially protruding undulations on

Press appropriately positioned pendulum masses or contact elements.

A respective convex region or a respective corrugation can have a larger distance to the arrangement plane of the annular bending spring on the radial outer side of the annular form than on the radial inner side. The

Arrangement level is the standing substantially perpendicular to the axis of rotation Plane corresponding to the plane of the arrangement of the annular bending spring independent of the convex portions.

In a further embodiment of the annular bending spring is provided that it has axially projecting elements which are suspended in the pendulum, on which the bending spring is axially supported.

These outstanding elements ensure a certain angular position of the annular bending spring with respect to the pendulum flange, even when the counterforce of the force applied by the bending spring frictional force on the bending spring tangential to the rotational movement of the pendulum flanges.

The centrifugal pendulum according to the invention may have two pendulum flanges, so that the centrifugal pendulum next to the first-mentioned pendulum has a further, second pendulum, wherein the two pendulum flanges along the

Rotary axis are arranged opposite to each other and the pendulum masses are arranged between the pendulum flanges. The two pendulum flanges are designed to rotate together around the axis of rotation and the registered

Absorb vibrations and transfer them to the pendulum masses. The friction device may comprise one or two annular bending springs.

Thus, the centrifugal pendulum as a friction device only have an annular first bending spring between the first pendulum and the contact elements of the pendulum masses. By the generated by the individual bending spring

Normal forces acted on the pendulum masses on the other, second

Pendulum flange on.

In an alternative embodiment, the centrifugal pendulum as a friction device on two annular bending springs, wherein an annular first bending spring between the first pendulum and the contact elements of the pendulum masses is arranged, and an annular second bending spring between the other, second

Pendulum and the contact elements of the pendulum masses is arranged. In the first alternative, when the pendulum masses or their contact elements move, there are frictional forces between the contact element and the contact element

Biegefeder designed friction on the one hand, and on the other hand between the pendulum mass or its contact element and the second pendulum.

In the second mentioned alternative, the centrifugal pendulum has a friction device in the form of an annular spiral spring, in particular an annular leaf spring, with which a force is applied to the shaft substantially parallel to the axis of rotation

Pendulum masses or the associated contact element is applied, so that upon movement of a pendulum mass, a frictional force acts on the pendulum mass or its associated contact element against the movement of the pendulum mass. Thus, upon movement of the pendulum masses or their contact elements, there are frictional forces between the contact element and the first bending spring on the one hand, and between the pendulum masses or their contact elements and the second annular bending spring, which is supported axially on the second pendulum flange. In both cases, the equilibrium with the applied by the friction device or the bending springs normal forces by means of one or more

Pendulum flanges generated.

That is, the pendulum masses loaded axially with the forces from the friction device, on the other hand, are supported directly or indirectly on the further pendulum flange in order to create a static equilibrium in the axial direction.

In a further embodiment, it is provided that the friction device comprises a plurality of helical compression springs, which in openings or recesses in the

Pendulum masses are received and exert axially each a normal force on the respective pendulum mass associated contact element, so that it is pressed axially against at least one pendulum. A respective helical compression spring is thus received positively in the pendulum mass. The

Screw compression spring presses against the with a respective standard force axially

Contact element of the respective pendulum mass, which in turn against a

Swinging flange pushes. By a relative movement between the contact element and the pendulum creates between these components during movement of the Pendulum mass a frictional force, which is directed against this movement, so that a swinging motion of the pendulum mass is damped.

In the embodiment of the centrifugal pendulum in which two oppositely positioned pendulum flanges are present, the coil compression springs are supported axially on also axially opposite regions of the contact element or on opposite contact elements, which in turn axially to the

Support pendulum flanges.

To solve the problem, a drive arrangement for a motor vehicle is additionally provided, which a drive machine, in particular a

Combustion engine, as well as a vehicle transmission and an inventive centrifugal pendulum, wherein the centrifugal pendulum, the drive machine and the vehicle transmission rotatably mechanically interconnected. The centrifugal pendulum can be mounted in particular on the hub, or on the flange of a clutch disc or directly to a transmission input shaft. Thus, the centrifugal pendulum is part of an assembly on the output side of the

Friction clutch is provided and forms the input side of the transmission. The above-described invention will be explained in detail in the background of the relevant technical background with reference to the accompanying drawings, which show preferred embodiments. The invention is not limited by the purely schematic drawings in any way, it being noted that the embodiments shown in the drawings are not limited to the dimensions shown. It is shown in

FIG. 1: an overhead centrifugal pendulum according to the invention,

3 shows a sectional view along the section E-E indicated in FIG. 1, FIG. 4 shows the detail Z indicated in FIG. 1 in an enlarged view, FIG.

5 shows a sectional view along the section FF indicated in FIG. 1, FIG. 6 shows an exploded view of the centrifugal force pendulum according to the invention, FIG. 7: a top view of a bending spring,

FIG. 8 shows the side view of the spiral spring shown in FIG. 7,

FIG. 9 shows the detail X indicated in FIG. 8 in an enlarged view,

Figurl O: a perspective view of the spiral spring,

FIG. 11: a sectional view of a centrifugal pendulum pendulum according to the invention of a further embodiment,

FIG. 12 shows a detail representing a pendulum mass of the centrifugal pendulum pendulum; FIG. 13 shows a sectional view of a centrifugal pendulum pendulum according to the invention of a further embodiment.

The centrifugal pendulum according to the invention shown in the figures is constructed such that, as is apparent in particular from Figures 2,5, 6, 1 1 and 13, 2 along a rotation axis 1 parallel to each other arranged pendulum flanges, namely a first pendulum flange 20 and a second pendulum flange 21. In between pendulum masses 10 are suspended or swingable

arranged. These pendulum masses 10, the in Figs. 1 and 12

perform indicated vibrational movement 2, namely in particular about the axis of rotation 1 around. For this purpose, the pendulum masses 10 are connected to rollers 60 which are guided in guide slots 22 in the pendulum flanges 20,21 movable.

As can be seen in particular from FIGS. 2, 6, 11 and 13, a respective pendulum mass 10 is configured on its radially inner side 11 and partly on the axially delimiting side surfaces with a contact element 40, which is preferably a plastic element. This contact element 40 is fixedly connected to the body of a respective pendulum mass 10.

In the embodiment shown in Figure 2 it can be seen that the

Contact element 40 on both sides of the pendulum mass 10 has a same wall thickness 41. In contrast, it can be seen from FIG. 11 that the wall thicknesses 41 on both sides of the pendulum mass 10 can also be different. A centrifugal pendulum according to the invention has a friction device 30, which in the embodiment shown in FIG. 2 comprises a first spiral spring 31 and a second spiral spring 32. The two bending springs 31, 32 are arranged in the axial direction between the contact element 40 and the two pendulum flanges 20,21. The two spiral springs 31, 32 are based in the axial direction of the two pendulum flanges 20,21 and press axially on both sides against the contact element 40, on which thus the contact between the bending springs 31, 32 and the pendulum mass 10 is realized. Due to the respective normal forces Fn realized by the bending springs 31, 32 on the contact element 40, as can be seen, for example, in FIG. 2, corresponding frictional forces Fr arise there, as can be seen, for example, in FIG. 3, if a respective pendulum mass 10 follows accordingly also the associated

Contact element 40 moves. These frictional forces Fr counteract the oscillatory movements 2 of the pendulum masses 10 and thus reduce the oscillation amplitudes of the pendulum masses 10.

Thus, upon movement of the pendulum masses 10, a relative movement takes place between the bending springs 31, 32 fixed in relation to the pendulum flanges 20, 21 and the contact elements 40 movable with the pendulum masses 10.

In order to create a static equilibrium on the torsion springs 31, 32 and consequently counteract the frictional forces Fr arising have the

Bending springs 31, 32 axially projecting elements 34, the form cooperate conclusively with recesses in the pendulum flanges 20,21 to prevent a rotational displacement of the bending springs 31, 32 when commissioned with frictional force Fr. Such protruding elements 34 can be seen in particular in FIGS. 4, 5, 6 and 7.

From Figures 6-10, the preferred shape of the bending spring 31, 32 to be applied can be seen. As shown, such a bending spring 31, 32 is preferably configured with convex areas 33, which are also called corrugations. These convex portions 33 lead to the deviation of the shape of the bending spring 31, 32 from a plane.

It can be seen that a respective bending spring 31, 32 has a substantially annular shape, wherein the projecting elements 34 are arranged on the outer circumference of the bending spring 31, 32, differing from the ring shape. Accordingly, a respective bending spring 31, 32 has an inner diameter Di and an outer diameter Da. In FIGS. 8 and 9 it can be seen that a respective bending spring 31, 32 scarcely deviates from a plane configuration at its radially inner region, which is delimited by the inner diameter Di, but at the radially outer region which is defined by the outer diameter Da is limited, has relatively large convex portions 33 and consequently a relatively large deviation from a plane

Design.

The same is illustrated by Figure 9, where it can be seen that on the radially outer side of the distance to the arrangement plane Ha is much larger than on the radially inner side or as defined there distance to the arrangement level Hi. The convex portions 33 thus form the resilient regions of the torsion springs 31, 32, with which a respective normal force Fn is realized.

The centrifugal pendulum according to the invention is not on a symmetrical

Embodiment as shown in Figure 2 limited, but instead may only have a first bending spring 31 which presses against the contact member 40 on one side, which is supported on the axially opposite side of the second pendulum 21. The normal forces Fn are realized in this embodiment on the one hand by the first bending spring 31 and an axially opposite side by the system on the second pendulum 21, which applies the counterforce and thus also a normal force Fn to the contact element 40 applied by the first bending spring 31 normal force Fn , FIG. 13 shows a further specific embodiment, which differs from the embodiments shown in the preceding illustrations, in particular with regard to the friction device 30. In the illustrated in Figure 13

Embodiment, the centrifugal pendulum in openings 12 in the pendulum masses 10 arranged helical compression springs 50. A respective compression coil spring 50 presses axially against the both sides of the respective pendulum mass 10 existing

Contact element 40. Also in this embodiment, the contact element 40 is fixedly connected to the body of the pendulum mass 10. Due to the application of force by the helical compression spring 50, the contact element 40 presses axially on both sides of the pendulum mass 10 against the two pendulum flanges 20,21. As a result, the contact element 40 generates the normal forces on the two pendulum flanges 20,21, which in each case generates a corresponding frictional force on the respective pendulum flange 20,21 in a movement, such as a vibration movement 2, the pendulum mass 10 and consequently also the associated contact element 40 , which in turn reduces the oscillation amplitude.

With the centrifugal pendulum pendulum proposed here according to the invention, torsional vibrations can be achieved in an efficient manner, in particular

engine-driven motor vehicle drive trains reduced or

be eliminated.

LIST OF REFERENCE NUMBERS

1 rotation axis

2 oscillation movement

10 pendulum mass

1 1 radially inner side

12 opening

20 first pendulum flange

21 second pendulum flange

22 guide slot

30 friction device

31 first spiral spring

32 second spiral spring

33 convex area

34 outstanding element

40 contact element

41 wall thickness

50 screw compression spring

60 roll

Fn normal force

Friction force

Because outer diameter

Di inner diameter

Ha distance to the arrangement plane on the radially outer side

Hi distance to the arrangement plane on the radially inner side

Claims

claims

Centrifugal pendulum for damping torsional vibrations, with at least one about an axis of rotation (1) rotatable pendulum (20) and several on

Pendulum (20) displaceably arranged pendulum masses (10) for

Each embodiment of a substantially perpendicular to the axis of rotation vibration movement (2),

characterized in that with a respective pendulum mass (10) a

Contact element (40), in particular a plastic element, is mechanically firmly connected, and the centrifugal pendulum at least one friction device (30), with each of which a substantially parallel to the axis of rotation acting normal force (Fn) is realized on a respective contact element (40), so that during a movement of the pendulum mass (10) on the basis of the load with the first normal force (Fn), a frictional force (Fr) acting counter to the movement is produced on the contact element (40) of the respective pendulum mass (10).

Centrifugal pendulum according to claim 1, characterized in that the

Friction device (30) is designed substantially annular.

Centrifugal pendulum according to claim 2, characterized in that a respective pendulum mass (10) at least partially on its surface the

Contact element (40) on which the force applied by the friction device (30) normal force (Fn) acts.

Centrifugal pendulum according to claim 3, characterized in that the

Contact element (40) by a respective pendulum mass (10) partially enveloping plastic sheath is formed.

Centrifugal pendulum according to one of the preceding claims, characterized

characterized in that the friction device (30) comprises a bending spring (31, 32), in particular, an annular leaf spring is, with which the normal force (Fn) is effected on a respective contact element (40).

Centrifugal pendulum according to claim 5, characterized in that the

Biegefeder (31, 32) on the pendulum (20) is supported and a plurality of axially extending convex portions (33), wherein at least one convex portion (33) on the contact element (40) of a respective pendulum mass (10) and bears against this suppressed.

Centrifugal pendulum according to one of the preceding claims, characterized

characterized in that the centrifugal pendulum has a second pendulum flange (21), wherein the two pendulum flanges (20, 21) along the axis of rotation (1) are arranged opposite to each other and the pendulum masses (10) between the pendulum flanges (20, 21) are arranged.

Centrifugal pendulum according to claim 7, characterized in that the

centrifugal pendulum

i) as a friction device (30) has a first annular bending spring (31) between the first pendulum flange (20) and the contact elements (40) of the pendulum masses (10) and by the normal forces (Fn) applied to the pendulum masses (10) at the second, second Pendulum flange (21) abut; or

ii) as a friction device (30) has an annular first spiral spring (31) between the first pendulum flange (20) and the contact elements (40) of the pendulum masses (10), and an annular second bending spring (32) between the further, second pendulum flange (21 ) and the contact elements (40) of the pendulum masses (10).

Centrifugal pendulum according to claim 1, characterized in that the

Friction device (30) comprises a plurality of compression coil springs (50), in

Openings (12) are received in the pendulum masses (10) and the axially each have a normal force (Fn) on the respective pendulum mass (10) assigned contact element (40) exert, so that this is pressed axially against at least one pendulum flange (20, 21).

10. Drive arrangement for a motor vehicle, with a drive machine,

in particular an internal combustion engine, and with a

Vehicle transmission and a centrifugal pendulum according to one of claims 1 -9, wherein the centrifugal pendulum connects the drive machine and the vehicle transmission rotationally mechanically together.