DE102009013965A1 - Damping device for dual-mass flywheel in power train of motor vehicle i.e. hybrid vehicle, has intermediate elements that are movable relative to each other and arranged in series circuit between spring elements - Google Patents

Abstract

The device (40) has two spring arrangements provided with two spring elements (50, 52, 56, 58) that are connected to each other in a parallel manner. The spring arrangements are connected with each other in series by respective intermediate elements (46, 48). The intermediate elements are movable relative to each other and arranged in a series circuit between the spring elements. A friction contact is formed between the intermediate elements by a friction element (62). A spacer is arranged between the respective intermediate elements and the respective spring elements.

Description

The The invention relates to a damping device according to the preamble of claim 1.

to Reduction of consumption of an internal combustion engine is increasingly a driving style in a Untertertigenbereich derselbigen sought. this leads to to a high torsional excitation of the internal combustion engine and thus unacceptable hum at high gears of a corresponding transmission in the lower-speed driving range.

To decouple the torsional vibrations of the internal combustion engine damping devices in a drive train of a motor vehicle, in particular arranged between the internal combustion engine and a transmission, with low spring rate and low friction known. Such a damping device according to the prior art is in 1 shown.

1 shows a section of a front view of a damping device 10 for a powertrain of a motor vehicle and a schematic model 12 the damping device 10 to clarify their function. The damping device 10 is arranged, for example, between a torque converter of an automatic transmission of the motor vehicle and the automatic transmission and comprises a plurality of parallel about its circumference designed spring assemblies, of which representatively in 1 two spring packs 18 and 18 ' are shown. Such a spring package 18 respectively 18 ' is in turn made up of two springs connected in series 20 and 22 respectively 20 ' and 22 ' built up. For power transmission within the individual spring assemblies 18 and 18 ' is an intermediate ring 24 provided, which in its outer circumference recordings 26 for the springs 20 and 22 respectively 20 ' and 22 ' , what a 1 formed as helical springs, whereby a force from the spring 20 out on the spring 22 or from the spring 20 ' on the spring 22 ' is transferable. Due to a low friction of the damping device 10 occur resonances of the intermediate ring 24 on, which can only be reduced by a friction on the one hand to intermediate ring 24 and on the other hand at a damper input 14 or at a damper outlet 15 is attached. At the damper input 14 this is a connection to the above-mentioned torque converter, and at the damper output to a connection to the automatic transmission. It is also conceivable that it is the damper input 14 to a connection to a primary side of a two-mass flywheel, and at the damper output 15 is a connection to a secondary side of the two-mass flywheel. By this arrangement becomes parallel to one of the two springs 20 and 20 ' respectively 20 ' and 22 ' generates a friction which greatly reduces a decoupling effect of the respective spring and thus an insulating effect of the damping device 10 impaired. Thus, the torsional vibrations are not optimally decoupled and it comes to the noise mentioned above.

It is therefore an object of the present invention, a damping device of the aforementioned type such that a Reduction of a noise a flywheel allows is.

These Task is by a damping device solved with the features of claim 1. Advantageous embodiments with functional and nontrivial Further developments of the invention are specified in the dependent claims.

at such a damping device for one Powertrain of a motor vehicle with at least parallel connected Spring elements of a first spring arrangement and with at least two parallel spring elements of a second spring arrangement, wherein the spring arrangement by means of at least one intermediate element are connected in series, according to the invention at least two relative to each other provided movable intermediate elements, each between at least one of the respective spring elements of the first and the second spring arrangement are arranged in series.

This embodiment makes it possible for at least two intermediate elements movable relative to one another to be created which are completely decoupled from an input or an output of the damping device and nevertheless make possible said interconnection of the spring elements and of the spring arrangements. By this arrangement, a decoupling of torsional vibrations of a corresponding internal combustion engine is possible, whereby humming noises, especially in Untertertourigen driving areas of a corresponding internal combustion engine, are significantly reduced. Characterized in that the at least two intermediate elements adjacent to each other or are opposite, in particular in the longitudinal direction of a direction of extension of a drive train in which such a damping device is used, axially adjacent to each other, and move relative to each other, in particular rotate, is a generation of a frictional force between allows the two intermediate elements, whereby a damping of the torsional vibrations of the corresponding Ver combustion engine is enabled which has a reduction in humming noises result.

The Damping device according to the invention is preferably in the drive train of the motor vehicle between the internal combustion engine and an automatic transmission, and in particular can be arranged between a torque converter and the automatic transmission to reduce the torsional vibration and thus to reduce the Humming sounds. About that In addition, the damping device according to the invention also as a damping device for a at least two flywheel mass flywheel of the motor vehicle, and in particular for a two-mass flywheel, acting in which the damping device For example, in connection with the two-mass flywheel one hand on a primary side of the two-mass flywheel and on the other hand on a secondary side of the two-mass flywheel is connected.

The described advantages of the damping device also come to bear when, for example, between an electric machine and a transmission in a drive train a motor vehicle is arranged, as for example in hybrid vehicles the case may be.

A Increase this damping effect and thus a further reduction of the humming noise with simultaneous decoupling the torsional vibrations according to the invention thereby enables that over at least one friction element between at least one intermediate element and at least one further intermediate element formed a frictional contact is. In a relative movement of the intermediate elements arises a frictional force, causing the damping the torsional vibrations is increased. In this context can also be provided that provided a plurality of friction elements is. Because the damping the torsional vibrations is accompanied by a reduction in humming noises, is thereby a noticeable comfort gain for occupants of a motor vehicle with such damping device achieved, which is conducive to comfortable traveling, especially during long journeys.

at an advantageous embodiment The invention is a friction lining on at least one intermediate element intended. Thus, therefore, the frictional force between the intermediate elements possible by means of a friction lining, which, for example, applied directly to an intermediate element or can be provided on this. Thereby are additional and possibly space-consuming friction avoidable, so what on the one hand a required space for one such damping device as also a part number derselbigen reduced. Especially in space critical Areas, such as internal combustion engines and transmissions, in the context of such a damping device predominantly which is the case, this leads to greater flexibility Space utilization and thus to avoid package problems. The reduction of the number of parts results in a reduction of costs in the form of procurement and assembly costs, because only a small number of parts must be installed.

is between at least one intermediate element and the corresponding one Spring elements provided a spacing, this has the advantage that at load surges and fast load changes an additional Relative movement of the intermediate elements is achieved. This additional Relative movement and the resulting additional Friction leads to a quick decay of the fast load changes or the load shocks incurred Jerky vibrations, which is accompanied by a further increase in comfort. This spacing between the intermediate element and the corresponding one Spring elements thus refers to areas of the intermediate element, over which the aforementioned series connection of the respective spring elements the first and the second spring arrangement is realized. Concrete this means that, for example, in an initial state, the intermediate element with a recording for the realization of the series connection to a Spring element of a first spring arrangement is applied and by a spring element a second spring arrangement is spaced. With a movement of the intermediate element lifts the intermediate element from the spring element of first spring arrangement, whereupon a transition phase exists, in which the intermediate element with no spring element a contact received. Depending on the strength The movement forms a contact between the intermediate element and the spring element of the second spring arrangement. In any case is thereby an additional Realized relative movement between the at least two intermediate elements, because that further intermediate element always to the corresponding Spring elements is present or in contact with them. Through this additional Relative movement are all already described in this context Benefits achieved.

In a particularly advantageous embodiment of the invention, the spring elements connected in parallel on different spring stiffness, whereby the relative movement between the at least two intermediate elements is further favored to improve the damping of torsional vibrations while maintaining an optimal isolation of the torsional vibrations to avoid the humming noise. As already described goes with an increase in the frictional force an increase in the damping effect of the torsional vibrations, whereby the comfort of the occupants of the motor vehicle is further enhanced with such a damping device.

Thereby are realized different resonance frequencies of the intermediate elements, whereby at resonance of an intermediate element a large Relativweg to the non-resonating second intermediate element occurs. This results in an increase in the frictional force and thus in a damping the torsional vibrations and thus this unpleasant buzzing noise results to further increase comfort for the occupants of the motor vehicle.

As a result the reduction of torsional vibrations or the torsional vibrations are the humming noises reduced in all speed ranges and a waiver of cost- and weight-intensive absorbers avoided.

One Another advantageous aspect of the invention provides that at least a spring element for ensuring the friction contact is provided is. This means that by means of a spring element, for example two friction surfaces pressed on each other or pulled or the like, creating a steady contact this surfaces is realized. This is an attenuation of the torsional vibrations and thus a reduction of humming noise in all phases of operation Ensured, resulting in a further increase in comfort of the occupants of the motor vehicle results. It is also conceivable, a plurality to provide on spring elements. This is especially advantageous if, as described, a friction lining provided on an intermediate element is and this intermediate element by means of the spring element to the pressed second intermediate element becomes the safe, permanent formation of the friction contact. As well can be provided that it is the friction lining to a separate Component between the intermediate elements, and a composite component made of friction lining and intermediate elements by means of the spring element and optionally held a circlip in constant frictional contact becomes.

A essentially annular Training the intermediate element offers the advantage that thereby the intermediate element ideal to space conditions, as in particular occur in connection with internal combustion engine and transmission, is adapted and thus with a small space requirement as possible size surface is created to form a frictional contact.

One Two-mass flywheel with a damping device according to the invention according to one embodiment or according to a combination of embodiments, all of them described advantages with respect to the damping of torsional vibrations and reducing humming noises on. Is the damping device into the two-mass flywheel integrated, this results in a reduction of a required space and thus a reduction of package problems.

As already indicated, the advantages of the damping device according to the invention not only in conjunction with the damping device with a flywheel having at least two flywheel masses, as used for example in a manual transmission, for carrying, but also in particular in an arrangement of the damping device in a drive train of a motor vehicle between a torque converter and an automatic transmission, or even with an arrangement between an electric machine and a transmission that, for example has the form of an automatic transmission.

The means that the benefits mentioned in consequence of an insert the damping device according to the invention both in a conventional powertrain with an internal combustion engine and a transmission, in particular an automatic transmission, bring about, and especially in a powertrain of a hybrid vehicle, in which the described arrangement of the damping device between an electric machine and the transmission, in particular one Automatic transmission, extremely advantageous is.

Just related to the powertrain of the hybrid vehicle an arrangement of two damping devices in this drive train as particularly advantageous for the reduction of torsional vibrations and thus to reduce humming noises. In this case, the damping device for example, between an internal combustion engine and the electric machine and another damping device between the electric machine and the transmission, which in particular the Form of an automatic transmission has arranged. Another, especially larger, number at damping devices in a drive train according to the invention thereby conceivable without further notice.

Further advantages, features and details of the invention will become apparent from the following description of two preferred embodiments and from the drawing. The features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned in the following description of the figures and / or shown alone in the figures are not only attached in the respective case ben combination, but also in other combinations or alone, without departing from the scope of the invention.

The Drawings show in:

1 1 in sections a front view and a model of a damping device for a drive train of a motor vehicle according to the prior art,

2 a model of a damping device for a drive train of a motor vehicle in an alternative embodiment,

3 a front view of a damping device for a drive train of a motor vehicle according to the model in 2 with three spring packs and

4 a front view of a damping device for a drive train of a motor vehicle according to the model in 2 with four spring packs.

While the 1 shows a damping device for a drive train of a motor vehicle for damping torsional vibrations of an internal combustion engine, show the 2 to 4 an alternative embodiment of such a damping device with significantly improved insulation effect to avoid humming noises, especially in Untertertourigen areas of the internal combustion engine.

The 2 shows a model 40 a damping device for damping torsional vibrations of a corresponding internal combustion engine. The model 40 allows a good clarification of the function of the damping device. The damping device has a damper input 42 on, which is tied to a primary page. Furthermore, the damping device has a damper output 44 on, which is tied to a secondary page. At the damper input 42 it may be, for example, a connection to a primary side of a two-mass flywheel or even to a connection to a torque converter. At the damper output 44 it may be, for example, a connection to a transmission, in particular in connection with the torque converter to an automatic transmission, or else to a connection to a secondary side of said two-mass flywheel.

In the damping device according to the model 40 are two intermediate rings 46 and 48 provided, wherein the intermediate ring 46 between a spring 50 and a spring 52 a first spring package 54 is arranged and over which the springs 50 and 52 So are connected in series. The same applies to the second ring 48 that is between a spring 56 and a spring 58 a spring package 60 is arranged and over which so also the springs 56 and 58 of the spring package 60 are connected in series. The feathers 50 and 56 can also be a first and the springs 52 and 58 to summarize a second spring arrangement.

If the model is transferred to a specific embodiment of a corresponding damping device, then the two intermediate rings, which are movable relative to one another, are present 46 and 48 axially adjacent to each other, so that in a relative movement in the form of a relative rotation of the two intermediate rings 46 and 48 by a friction element arranged between them 62 a friction force is generated. In particular, in conjunction with the prior art according to 1 This makes it clear that an attenuation of torsional vibrations of a corresponding internal combustion engine is achieved by this arrangement while optimally insulating the torsional vibrations or torsional vibrations, since an elastic decoupling of the springs 50 . 52 . 56 and 58 is not affected by a parallel-connected friction element. Furthermore, by the friction element 62 or the friction between the intermediate rings 46 and 48 prevents resonance at an intermediate ring 46 or 48 high amplitudes occur.

The desired relative rotation between the intermediate rings 46 and 48 is favored by the fact that the spring 50 relatively soft and the spring 56 is designed relatively stiff while the spring 52 stiff and the spring 58 is designed relatively soft. Thus, so have the springs 50 and 56 respectively. 52 and 58 the respective spring arrangement against different spring rates. Besides these different spring stiffnesses of the springs, 50 . 52 . 56 and 58 have the intermediate rings 46 and 48 different rotational masses, whereby different resonance frequencies of the intermediate rings 46 and 48 be generated, whereby at resonance of an intermediate ring 46 respectively. 48 a large relative distance to the non-resonating second intermediate ring 48 respectively. 46 occurs. By this Relativweg the damping of the torsional vibration is again significantly improved.

The 3 shows a damping device 70 with a first intermediate ring 72 and a second intermediate ring 74 and with three spring packs 76 . 78 and 80 , The spring package 76 includes two springs connected in series 82 and 84 , the spring package 78 includes two springs connected in series 84 and 86 and the spring package 80 includes two springs connected in series 88 and 90 , The spring packages 78 and 80 are doing over a range of damping direction 50 connected in parallel. Like in the 3 The feathers are visible 82 and 84 of the spring package 76 about a recording 92 of the first intermediate ring 72 connected in series while each feather 84 and 86 about a recording 94 of the second intermediate ring 74 and the springs 88 and 90 of the spring package 80 about a recording 96 of the second intermediate ring 74 are connected in series. Between the spring 82 and the recording 92 In this case, a clearance angle α is provided, which in load surges and during rapid load changes to an additional relative movement between the intermediate rings 72 and 74 leads, whereby a frictional force for damping torsional vibrations can be realized. Like in the 3 to see through the section A to A is between the intermediate rings 72 and 74 a friction element 98 arranged, whereby in consequence of the relative movement of the intermediate rings 72 and 74 an attenuation of torsional vibrations over an entire speed range of a corresponding internal combustion engine is achieved. To ensure a steady contact even with any wear of the friction element 98 is a spring element 100 provided, which on the one hand on a retaining ring 102 and on the other hand on an intermediate ring 72 supports and thus both intermediate rings 72 and 74 and the friction element 98 compresses.

Furthermore, the intermediate rings 72 and 74 different rotating masses, whereby resonance frequencies of the intermediate rings 72 and 74 clearly apart. This occurs at resonance, for example, the intermediate ring 72 a large relative distance to the non-resonant intermediate ring 74 on, which in turn generates a frictional force and thus a damping effect of torsional vibrations or torsional vibrations.

Since at the in 3 shown embodiment of the damping device 70 with three spring packages 76 . 78 and 80 the intermediate ring 72 with the spring package 76 and the intermediate ring 74 with the parallel spring packs 78 and 90 are connected, there are significant differences in the spring stiffness, resulting in a relative rotation of the two intermediate rings 72 and 74 leads. Possible tension of the intermediate ring 72 By breaking one possibly with a counterweight can be prevented. In the 4 like reference characters designate like elements as in FIG 3 , A damping device 70 ' differs from the damping device 70 according to 3 in that now four spring packs 76 . 78 . 76 ' and 80 are provided, in 3 the intermediate ring 74 with the spring packages 78 and 80 is connected while an intermediate ring 72 ' according to 3 it differs in that he also with the spring package 57 but additionally with a second spring package 76 ' connected is. Accordingly, in the intermediate ring 72 ' now two clearance angles α are provided to achieve in this regard in 3 described advantages. The spring package 76 ' includes springs 82 ' and 84 ' ,

Regarding the operation of the damping device 70 ' that applies to 3 said analog. A relative rotation of the intermediate rings 72 ' and 74 in this damping device 77 ' is due to different stiffness of the spring packs 77 and 76 ' of the intermediate ring 72 ' and the spring packs 78 and 80 of the intermediate ring 74 achievable, whereby a friction force on the friction element 98 arises for damping the torsional vibrations.

Also for the damping device 70 ' all apply in connection with the damping device 70 ' according to 3 described advantages of optimal isolation of torsional vibrations or torsional vibrations while damping to avoid disturbing buzzing noise due to resonance and a possible elimination of a damper.

As already related to 2 indicated, are the damping devices 70 respectively. 77 ' of the 3 respectively. 4 both in conjunction with at least two flywheel masses having flywheels, as they are used in particular for manual transmissions used. Likewise, the advantages but also come in an arrangement between an internal combustion engine and a transmission to advantage if no such flywheel is provided. In particular, in a drive train with an internal combustion engine and an automatic transmission usually no flywheel is provided. Thus, the damping device 70 respectively. 70 ' between the internal combustion engine and the automatic transmission and in particular between a torque converter and the automatic transmission can be arranged to achieve all the advantages described.

Also in the context of a drive train of a hybrid vehicle is the damping device 70 respectively. 70 ' can be used to achieve all the advantages, in particular in an arrangement of two damping devices between an internal combustion engine and an electric machine and between the electric machine and a transmission, in particular an automatic transmission.

Claims (10)

Damping device ( 10 . 70 . 70 ' ) for a drive train of a motor vehicle with at least two parallel-connected spring elements ( 20 . 20 ' . 50 . 52 . 56 . 58 . 82 . 82 ' . 84 . 84 ' . 86 . 87 . 88 . 90 ) of a first spring arrangement and with at least two par allel switched spring elements ( 20 . 20 ' . 50 . 52 . 56 . 58 . 82 . 82 ' . 84 . 84 ' . 86 . 87 . 88 . 90 ) of a second spring arrangement, wherein the spring arrangements by means of at least one intermediate element ( 24 . 46 . 48 . 72 . 72 ' . 74 ) are connected in series, characterized in that at least two relatively movable intermediate elements ( 24 . 46 . 48 . 72 . 72 ' . 74 ) are provided, which in each case between at least one of the respective spring elements ( 20 . 20 ' . 50 . 52 . 56 . 58 . 82 . 82 ' . 84 . 84 ' . 86 . 87 . 88 . 90 ) of the first and the second spring arrangement are arranged in series connection. Damping device ( 10 . 70 . 70 ' ) according to claim 1, characterized in that via at least one friction element ( 27 . 62 . 98 ) between at least one intermediate element ( 24 . 46 . 48 . 72 . 72 ' . 74 ) and at least one further intermediate element ( 24 . 46 . 48 . 72 . 72 ' . 74 ) A frictional contact is formed. Damping device ( 10 . 70 . 70 ' ) according to claim 2, characterized in that on at least one intermediate element ( 24 . 46 . 48 . 72 . 72 ' . 74 ) A friction lining is provided. Damping device ( 10 . 70 . 70 ' ) according to one of the preceding claims, characterized in that between at least one intermediate element ( 24 . 46 . 48 . 72 . 72 ' . 74 ) and the corresponding spring elements ( 20 . 20 ' . 50 . 52 . 56 . 58 . 82 . 82 ' . 84 . 84 ' . 86 . 87 . 88 . 90 ) a spacing (α) is provided. Damping device ( 10 . 70 . 70 ' ) according to one of the preceding claims, characterized in that the spring elements ( 20 . 20 ' . 50 . 52 . 56 . 58 . 82 . 82 ' . 84 . 84 ' . 86 . 87 . 88 . 90 ) of a spring arrangement have different spring stiffnesses. Damping device ( 10 . 70 . 70 ' ) according to one of the preceding claims, characterized in that the intermediate elements ( 24 . 46 . 48 . 72 . 72 ' . 74 ) each have different rotational masses. Damping device ( 10 . 70 . 70 ' ) according to one of the preceding claims, characterized in that at least one spring element ( 100 ) is provided to ensure the frictional contact. Damping device ( 10 . 70 . 70 ' ) according to one of the preceding claims, characterized in that at least one intermediate element ( 24 . 46 . 48 . 72 . 72 ' . 74 ) is formed substantially annular. Dual mass flywheel with a damping device ( 10 . 70 . 70 ' ) according to any one of the preceding claims. Drive train of a motor vehicle with at least one damping device ( 10 . 70 . 70 ' ) according to one of claims 1 to 8.