WO2017206991A1

WO2017206991A1 - Centrifugal pendulum having radial guiding of the pendulum masses

Info

Publication number: WO2017206991A1
Application number: PCT/DE2017/100459
Authority: WO
Inventors: Uli Junker
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2016-06-03
Filing date: 2017-05-30
Publication date: 2017-12-07
Also published as: DE112017002751A5; DE102017111754A1

Abstract

The invention relates to a centrifugal pendulum (1) of a drive train of a vehicle driven by an internal combustion engine having pendulum masses (4) arranged so as to swivel relative to a support flange (2, 3) or between two axially spaced support flanges (2, 3). The pendulum masses (4) are guided over running rollers (9) which engage in guide tracks (8, 10) running in opposite directions to one another in the support flange (2, 3) and in the pendulum masses (4). For restriction of the freedom of movement of the pendulum masses (4) in the operating state, each pendulum mass (4) is supported at least by means of a radially inwardly oriented cam (14) on a corresponding counter-contour (15) directed radially outwards on the support flange (2, 3).

Description

Centrifugal pendulum with radial guidance of the pendulum masses

The invention relates to a centrifugal pendulum of a drive train of a combustion engine-driven vehicle with relative to a support flange or between two axially spaced support flanges of the centrifugal pendulum pendulum pendulum masses according to the features of the preamble of claim 1.

Due to combustion processes of the reciprocating internal combustion engine, a rotational nonuniformity occurs, which is transmitted to the drive train of the vehicle. As a measure to dampen the thereby induced adverse torsional vibrations or torsional vibrations, it is known to use a centrifugal pendulum or a centrifugal pendulum device. Preferably in combination with a dual-mass flywheel occurring oscillations in the drive train can be reduced by means of the centrifugal pendulum. During an accelerated rotational movement of a shaft, the centrifugal pendulum energy stores energy that is released again in a delayed rotational movement of the shaft. Known centrifugal pendulum pendulum masses, which are arranged movably in connection with rollers. For this purpose, each roller is guided in counter-rotating pendulum or slide tracks inserted in the pendulum mass and the carrier flange. Due to this arrangement, the pendulum mass can perform a relative movement to the support element in the operating state of the centrifugal pendulum. The structure and function of such a centrifugal pendulum are shown and described for example in DE 10 2006 028 552 A1.

In the operating state of the internal combustion engine of a vehicle, uncontrolled oscillatory movements with maximum deflections of the pendulum masses can occur, for example, in the low speed range. These lead to adverse rattling noises, which lead to a subjectively perceivable loss of driving and noise comfort. Furthermore, by the striking of the pendulum masses malfunctions of the centrifugal pendulum arise as well as an increased Wear that shortens the life of the centrifugal pendulum. As a measure to avoid these malfunctions is provided according to DE 10 2009 042 836, to arrange elastic stops made of plastic on the pendulum masses.

From DE 10 2014 217 460 A1, a centrifugal pendulum is known, to which a brake element is assigned, which is displaceable axially against the pendulum mass via a friction lining in order to decelerate the pendulum mass, if necessary. At the same time the freedom of movement of the pendulum masses can be limited by the braking element. By means of an external device via which the braking element is controllable, the deceleration of the pendulum masses can be done to override the function of the centrifugal pendulum.

The invention has for its object to provide a centrifugal pendulum in which a radial freedom of movement is limited, without negatively affecting primary eradication properties.

The object is achieved by a centrifugal pendulum with the features of claim 1. Preferred embodiments of the invention are specified in the subclaims, which individually or in combination represent further aspects of the invention.

The inventively constructed centrifugal pendulum provides that to limit the radial freedom of movement of the pendulum masses in the operating state each pendulum mass is supported at least temporarily via at least one radially inwardly directed cam on a radially outwardly directed corresponding mating contour of the support flange.

The invention reduces the radial mobility or the rotation of the pendulum masses by at least one cam or a nose of the pendulum mass during the pendulum movement along the corresponding mating contour on Flange or support flange is guided or supported. To ensure optimum guidance of the pendulum mass, the distance between the nose and the mating contour is designed to be as small as possible.

Due to the interaction of the cam of the pendulum mass with the mating contour of the support flange in the operating state, the radial mobility of the pendulum mass is advantageously restricted and thus avoided their adverse adjustment or swinging motion. The structurally simple design and cost feasible concept according to the invention ensures a permanent restriction of the radial freedom of movement and the avoidance at least but a reduction in the rotation of the pendulum masses. As a result, both a noise and a wear-optimized centrifugal pendulum can advantageously be realized. The primary structure of the centrifugal force pendulum is advantageously not adversely affected by the construction according to the invention. There is a continuing need to reduce noise in the driveline of the vehicle to increase comfort to the end user. This requirement meets the structurally simple and cost-effective, inventive, self-acting concept that effectively and fatigue at least restricts the radial freedom of movement of the pendulum mass, to realize a noise and wear-optimized centrifugal pendulum.

In hitherto known centrifugal pendulum pendulum masses is limited by the rollers in contrast to the invention, the radial freedom of movement. This arrangement allows a correspondingly large radial movement of the pendulum masses, which leads to a disadvantageous noise and at the same time causes adverse signs of wear. In particular, the rollers and their associated link or pendulum tracks, the elastic stop elements of the pendulum masses and if installed the coupling springs are exposed to increased wear. Advantageously, the invention is transferable both to conventional centrifugal pendulum with a central support flange and pendulum masses positioned on both sides and on double flange centrifugal pendulum with centrally arranged pendulum mass. Furthermore, it makes sense to combine the solution according to the invention with alternatively constructed constructions of centrifugal force pendulums.

The inventively designed components, the pendulum mass and the support flange can be inexpensively made without cutting by means of a forming or a stamping process of a steel sheet. At the same time, the method includes the molding or the production of the nose on the pendulum mass as well as the production of the counter contour on the support flange.

According to a preferred embodiment of the invention it is provided that each pendulum mass has two cams, which are associated with two mating contours on the carrier flange. Furthermore, it is advantageous to build the pendulum mass in several parts, consisting of an intermediate plate, which is assigned to both sides of a mass element. On an inner side of the intermediate plate two coincidentally rounded cams or lugs are provided, which are associated with two likewise rounded counter contours on the support flange. The cams are preferably angularly offset in the end zone region of the pendulum mass or its intermediate plate when viewed in the circumferential direction. In this case, both the cams and the mating contours are offset from the particular intended for the rollers slide tracks in the pendulum mass and the support flange positioned. The rounded, radially outwardly directed counter contours are provided in mutually angularly offset recesses of the potted carrier flange and the cams on an inner side of the disc-like intermediate plate of the pendulum mass.

A preferred structural embodiment of the invention provides for the cams of the pendulum mass or of the intermediate plate preferably to be designed as locally projecting rounded pegs. The counter contours on the support flange are advantageously designed as a circle segment or as a circle section, designed as the partial area of a circular area which is bounded by a circular arc and a chord. However, the invention is not limited to the aforementioned geometric shapes for the cams and the counter contours.

To achieve an optimum effect of the invention, each providing a small distance between the cam of the pendulum mass or the intermediate plate and the associated mating contour on the support flange, a maximum distance of <2 mm is provided. If necessary, the inventive concept can also provide a deviating distance. Furthermore, the invention preferably includes for the integrally connected with the intermediate plate cam a radial height, which largely coincides with a height of the mating contours on the support flanges.

As a measure to avoid wear between the directly interacting components, the pendulum mass or the intermediate plate and the support flange, it makes sense to coat the contact surfaces on the cam and the counter contours friction-reducing. For example, a PTFE coating is suitable for this purpose. In addition or as an alternative to this, a molybdenum coating is available for the contact surfaces, which offers both effective wear protection and also improves the friction behavior.

In the following the invention will be described in more detail with reference to the embodiments illustrated in the figures. However, the invention is not limited to the embodiments shown in the figures. It shows:

in a partial view of an inventive centrifugal pendulum, constructed as a double flange centrifugal pendulum; Fig. 2 is a sectional view of the centrifugal pendulum of FIG. 1;

Fig. 3, the centrifugal pendulum as shown in FIG. 1, with a pendulum mass

in a middle position;

Fig. 4, the centrifugal pendulum as shown in FIG. 1, with a pendulum mass

in an end position;

Fig. 5 in a simplified representation of the pendulum mass with

an associated support flange;

Fig. 6: in a single part drawing a pendulum mass;

Fig. 7: a carrier flange in a single part drawing.

FIGS. 1 to 4 show in partial views the basic structure of a centrifugal pendulum pendulum 1 according to the invention, which is intended for a drive train of a vehicle driven by an internal combustion engine (not shown) and which is associated with a rotary part of the drive train, for example a dual-mass flywheel. As shown in FIG. 2, the centrifugal pendulum 1 constructed as a double flange centrifugal pendulum pendulum comprises two plugged support flanges 2, 3, which are combined on the inside and axially spread apart on the outside for receiving a plurality of pendulum masses 4 arranged circumferentially. The pendulum mass 4, which is constructed in three parts and is movably inserted between the support flanges 2, 3, consists of an intermediate plate 5 or spacer, to which a mass element 6, 7 is assigned on both sides, these components being joined together to form a structural unit. FIG. 1 shows a section of a centrifugal pendulum pendulum 1 in perspective, the support flange 3 not being shown for clarification of the invention. In each mass element 6, 7 of the pendulum mass 4 two mutually offset curved slide tracks 8 are introduced, in each of which a roller. 9 engaged with play, which is simultaneously guided in a counter-rotating to the slide track 8 further slide track 10 of the support flanges 2, 3 play. The components of the pendulum mass 4, the mass elements 6, 7 and the intermediate plate 5 are joined together via riveted joints 13 to form a structural unit. All in the circumferential direction successively arranged pendulum masses 4 are resiliently connected as a compression spring coupling springs 1 1 connected to each other, which are each inserted into end-side recesses 12 of the intermediate plates 5.

The centrifugal pendulum 1 further comprises a measure for restricting the freedom of movement or reducing the radial mobility and / or rotation of the pendulum masses 4 in the operating state. For this purpose, radially inwardly aligned cams 14 are integrally formed on the intermediate plate 5 of the pendulum mass 4 on the inside in both end regions, which each interact with a radially outwardly facing corresponding counter contour 15 of the support flanges 2, 3.

The counter-contours 15 are placed in mutually angularly offset recesses 16 of the support flanges 2, 3, which are arranged radially offset in relation to the slide tracks 10 in the region of the potted portions in the support flanges 2, 3. Fig. 3 shows a central position of the pendulum mass 4 relative to the support flanges 2, 3, in which each cam 14 of the intermediate element 5 of the highest elevation of the introduced in the recesses 16 counter contour 15 faces. Notwithstanding this, the pendulum mass 4 is shown in Fig. 4 in an end position, wherein the rollers 9 are supported at end zones of the slide track 8, 10. In this position of the pendulum mass 4, the cams 14 connected to the intermediate plate 5 are positioned in the recess 16 in a non-impact-free manner and with play. To achieve a damped stop engages a fixed position in the pendulum mass 4, enclosed by an elastic sleeve pin 17 in a corresponding guide track 18 of the support flanges 2, 3, which is thus resiliently supported in the end position at the guide track end.

FIG. 5 illustrates, in a simplified representation, the interaction according to the invention of the pendulum mass 4 with the associated support flanges 2, 3. On the inside at both end regions of the intermediate plate 5 of the pendulum mass 4 radially inwardly directed, also as rounded pins or lugs to be designated cam 14 are formed. According to the neutral position of the centrifugal force pendulum 1 shown in FIG. 5, corresponding to each cam 14 is in each case assigned a counter-contour 15, which is connected radially integrally with the carrier flange 2, 3 and formed as a circular segment or circular segment. In the operating state, an occurring rotational nonuniformity of the internal combustion engine leads to a radial movement or rotation of the pendulum mass 4. The degree of freedom of the pendulum mass 4 is limited to a distance X which adjusts between the cams 14 of the intermediate plate 5 and the associated counter-contours 15. This prevents unacceptable large freedom of movement or excessive rotation of the pendulum mass 4. A preferred structural design provides that the cams 14 and the associated counter-contours 15 have a matching length or height S. As a measure to reduce wear, it makes sense to coat both the contact surfaces 19 of the cams 14 of the intermediate plate 5 and the contact surfaces 20 of the mating contours 15 of the support flanges 2, 3 friction-reducing.

In FIGS. 6 and 7, the intermediate plate 5 of the pendulum mass 4 and the support flange 2, 3 are shown in individual part drawings. According to FIG. 6, the recesses 21 intended for the rollers 9, the position of which coincides as far as possible with the slide tracks 8 of the mass elements 6, 7, are offset radially outwards relative to the cams 14 in the intermediate plate 5. Correspondingly, FIG. 7 shows the carrier flange 2, 3, whose recesses 16 are arranged with respective counter contour 15 allocated radially inwards to the slide tracks 10 of the rollers 9. LIST OF REFERENCE NUMBERS

centrifugal pendulum

beam flange

pendulum mass

intermediate plate

mass element

link path

caster

link path

coupling spring

recess

rivet

cam

mating contour

recess

pen

guideway

contact area

recess

Height of the cams and the counter contour Distance between the cams and the counter contour

Claims

P160753-01 WO 2017/206991 PCT/DE2017/100459 - 10 - Patent claims

1. Centrifugal pendulum of a drive train of an internal combustion engine-driven vehicle with pendulum masses (4) arranged pivotably relative to a carrier flange (2, 3) or between two axially spaced carrier flanges (2, 3), the pendulum masses (4) being mounted via rollers (9). are guided, which engage in opposing slide tracks (8, 10) of the support flange (2, 3) and the pendulum masses (4), with freedom of movement of the pendulum masses (4) being limited, characterized in that to restrict the freedom of movement of the pendulum masses ( 4) in the operating state, each pendulum mass (4) is supported at least temporarily via at least one radially inwardly directed cam (14) on a radially outwardly directed corresponding counter contour (15) of the carrier flange (2, 3).

2. Centrifugal pendulum according to claim 1, characterized in that each pendulum mass (4) has two cams (14), each of which is assigned a counter contour (15) of the carrier flange (2, 3).

3. Centrifugal pendulum according to one of the preceding claims, characterized

characterized in that the cams (14) of the pendulum mass (4) and the counter contours (15) on the support flange (2, 3) are arranged offset from the link tracks (8, 10) intended for the rollers (9).

4. Centrifugal pendulum according to one of the preceding claims, characterized

characterized in that the rounded, radially outwardly directed counter contours (15) are introduced into mutually angularly offset recesses (16) in the support flange (2, 3).

5. Centrifugal pendulum according to one of the preceding claims, characterized

characterized in that the cams (14) of the intermediate plate (5) are each designed as locally radially projecting rounded pins. P160753-01

WO 2017/206991 PCT/DE2017/100459

- 1 1 -

Centrifugal pendulum according to one of the preceding claims, characterized

characterized in that the multi-part pendulum mass (4) comprises an intermediate plate (5) to which a mass element (6, 7) is assigned on both sides, the cams (14) being provided on the inside of the intermediate plate (5).

Centrifugal pendulum according to one of the preceding claims, characterized in that the counter contours (15) of the support flanges (2, 3) are each designed as a circular segment.

Centrifugal pendulum according to one of the preceding claims, characterized in that a maximum distance (X) of < 2 mm is provided.

Centrifugal pendulum according to one of the preceding claims, characterized in that a radial height (S) of the cams (14) connected in one piece to the intermediate plate (5) and of the counter contours (15) of the support flanges (2, 3) match.

Centrifugal pendulum according to one of the preceding claims, characterized in that contact surfaces (19) of the cams (14) of the intermediate plate (5) and contact surfaces (20) of the counter contours (15) of the support flanges (2, 3) are coated to reduce friction.