CN108368912B

CN108368912B - Centrifugal force pendulum

Info

Publication number: CN108368912B
Application number: CN201680069677.8A
Authority: CN
Inventors: W·齐尔默; J-P·布吕阿
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2015-12-17
Filing date: 2016-11-25
Publication date: 2020-11-27
Anticipated expiration: 2036-11-25
Also published as: DE102015225621A1; WO2017101929A1; CN108368912A; DE112016005785A5

Abstract

The invention relates to a centrifugal pendulum having pendulum mass carriers arranged so as to be rotatable about an axis of rotation and pendulum masses (1) distributed in the circumferential direction and received on the pendulum mass carriers by means of pendulum bearings of a predefined pendulum rail, wherein a helical compression spring (6) is arranged between each two pendulum masses (1) adjacent in the circumferential direction on the end side. In order to protect the helical compression springs (6) from damage due to contact with the pendulum masses (1) and to prevent noise, notches (3) are provided in each case in the end face ends of the pendulum masses (1), in which notches the plastic cage (4) receiving the end face regions (7) of the helical compression springs (6) is received in a loss-proof manner.

Description

Centrifugal force pendulum

Technical Field

The invention relates to a centrifugal pendulum having pendulum mass carriers, which are arranged in a manner rotatable about an axis of rotation, and pendulum masses, which are arranged distributed in the circumferential direction and are received on the pendulum mass carriers by means of pendulum bearings of a predefined pendulum rail, wherein a helical compression spring is arranged between each two pendulum masses adjacent in the circumferential direction on the end side.

Background

Centrifugal force pendulums are sufficiently known from the drive train of a motor vehicle. The pendulum mass carrier is received in a rotatable manner about an axis of rotation, for example, a crankshaft of an internal combustion engine, a transmission input shaft of a transmission or the like. Pendulum masses are arranged distributed over the pendulum mass carrier in the circumferential direction, said pendulum masses being suspended in a plane perpendicular to the axis of rotation in an oscillating manner relative to the pendulum mass carrier. By means of such a pendulum suspension, the pendulum masses form a rotational speed-adapted rotational vibration damper in the centrifugal force field of the rotating pendulum mass carrier, in that the pendulum masses draw energy from the drive train during torque peaks by means of a corresponding deflection and supply energy to the drive train when the torque is minimal.

As is known from WO2014/082629 a1, the pendulum masses can be arranged distributed in the axial direction between the two side parts forming the pendulum mass carrier in the circumferential direction, wherein these pendulum masses are held on a predefined pendulum rail by means of pendulum bearings in the centrifugal force field of the rotating pendulum mass carrier. In particular during the starting/stopping of the internal combustion engine, the pendulum masses are strongly deflected or displaced radially inward, so that a collision noise can occur. Thus, a centrifugal force pendulum is known from WO15/149789 a1, which has a pendulum mass carrier, which is formed by a central flange part and has pendulum masses arranged on both sides, wherein a helical compression spring is arranged in the circumferential direction between adjacent pendulum masses in the circumferential direction. Furthermore, a centrifugal force pendulum is known from WO15/144169 a1, in which a helical compression spring is arranged between two pendulum masses which are adjacent in the circumferential direction and which are arranged between two disks which form a pendulum mass carrier. Such helical compression springs elastically space adjacent pendulum masses apart from one another, so that the pendulum masses can be reduced or even prevented from colliding with one another. However, the helical compression springs are accelerated radially to the outside by centrifugal force, so that they can bend in the radial direction and can bear against the pendulum mass, which can cause noise and damage the helical compression springs.

From WO 2015/149789 a1, a centrifugal force pendulum is known, which has a pendulum mass carrier in the form of a pendulum flange with pendulum masses arranged on both sides, which have helical compression springs supporting one another in the circumferential direction, wherein the helical compression springs are prevented from buckling by a hinge connection extending in the helical compression springs.

Disclosure of Invention

The aim of the invention is to advantageously develop a centrifugal force pendulum of this type. The aim of the invention is, in particular, to prevent buckling of helical compression springs without coupling of adjacent pendulum masses in the circumferential direction. The object of the invention is also to provide a centrifugal force pendulum which is simple and easy to assemble.

The proposed centrifugal force pendulum device is provided in particular for a drive train of a motor vehicle having an internal combustion engine with rotational vibrations. The centrifugal force pendulum comprises a pendulum mass carrier, which is formed from two disks or as a pendulum flange and is arranged so as to be rotatable about an axis of rotation. The pendulum mass carrier can be arranged, for example, on the single mass flywheel, on the primary or secondary part of the dual mass flywheel, on the clutch disk, inside the hydrodynamic torque converter or outside the hydrodynamic torque converter, or the like. The pendulum mass carriers receive the pendulum masses distributed in the circumferential direction, which are received between the two disks or on both sides on the pendulum flange. The pendulum masses are held on a predetermined pendulum rail in the centrifugal force field of the rotating pendulum mass carrier by means of pendulum bearings on the disk or on the pendulum flange.

In this case, the pendulum mass is suspended eccentrically to the axis of rotation on a pendulum mass carrier by means of a pendulum bearing in a pendulum-type manner and assumes its operating position under the effect of centrifugal force, which shifts (vertemmen) as a result of the rotational vibrations absorbing energy, so that a damping effect occurs. Here, the pendulum bearings are formed by guide rails, which are formed complementary to one another, in the disk or pendulum flange and in the pendulum mass, on which the rolling bodies (for example pendulum rollers) each roll. The pendulum bearing thereby defines a predetermined pendulum movement which is embodied in the form of a circular arc or in almost any other desired shape, for example, offset from the circular arc shape, for example, at the end, a reduced radius may be provided, so that the pendulum masses cannot collide at the maximum oscillation angle. The pendulum bearings are placed, for example, by means of notches in the disk or in the pendulum flange and in the pendulum mass, wherein correspondingly configured guide rails are provided in the notches, on which guide rails rolling bodies (for example pendulum rollers or the like) that overlap the guide rails roll.

In the simplest case, the guide rail can form a single-wire suspension of the pendulum mass in the sense of a linear pendulum, but it has proven advantageous to form a double-wire suspension of the pendulum mass by means of two pendulum bearings spaced apart in the circumferential direction. Here, a pendulum movement corresponding to a parallel arrangement of cycloids can be provided. Preferably, a pendulum guide device is proposed in which the cycloids are arranged in accordance with a trapezoid, wherein the pendulum masses additionally rotate during the pendulum movement, so that an additional inertia and thus an improved isolation action can be provided.

In each case one helical compression spring is arranged on the end side on the pendulum masses adjacent in the circumferential direction, which helical compression springs prevent contact of the end sides of the pendulum masses adjacent in the circumferential direction in the case of large oscillation angles of the pendulum masses. In order to avoid buckling of the helical compression spring and at the same time to avoid noise generation and damage to the helical compression spring in the event of high rotational speeds and therefore high centrifugal forces and at the same time to avoid contact with the pendulum mass at a distance from one another in the circumferential direction and without substantially impeding the movement of the pendulum mass, notches are provided in the end faces of the pendulum mass in each case, in which notches the plastic cage receiving the end face regions of the helical compression spring is received in a loss-proof manner. Thereby, the end surface area of the helical compression spring is reliably received. The plastic cage prevents the helical compression spring from coming into direct contact with the pendulum mass and thus prevents noise and damage to the helical compression spring.

To receive the plastic cage in a loss-proof manner, it can be clipped into the pendulum mass or latched to it.

According to an advantageous embodiment, the plastic cage has a cylindrical, blind-hole opening which dips into the slot and in which the end face region of the helical compression spring is received. In order to further fix the plastic cage or to form the impact region on the end face of the pendulum mass, the plastic cage can have an abutment region which abuts against the end face of the pendulum mass.

In accordance with an advantageous embodiment of the centrifugal force pendulum, the pendulum mass carrier is designed as a pendulum flange on which the pendulum masses are arranged on both sides, wherein axially opposite pendulum masses are connected to form a pendulum mass unit by means of a connecting means which passes through a slot of the pendulum flange, wherein a helical compression spring arranged between two pendulum masses adjacent in the circumferential direction is arranged at least on one side of the pendulum flange.

In accordance with a further advantageous embodiment of the centrifugal force pendulum, the pendulum mass carrier is formed by two disks having a receiving region, on which the two disks are spaced apart from one another in the axial direction, wherein the pendulum mass is received in the receiving region.

In this case, the plastic cage can be widened in the axial direction with respect to the pendulum mass and the pendulum flange or the side part can be spaced apart from the pendulum mass in the axial direction. For example, in the case of a pendulum mass carrier designed as a pendulum flange, the plastic cage can be widened axially on one side in the direction of the pendulum flange, so that the axially opposite pendulum masses of the pendulum mass unit are positioned centrally on the pendulum flange. In the case of a pendulum mass carrier in the form of two disks, the plastic cage can be widened axially on both sides, so that the pendulum mass is positioned centrally between the two disks.

The pendulum mass can be formed, for example, from a plurality of layered plate disks, wherein at least one plate disk arranged between the outer plate disks has a groove, i.e., at least in the region of the end face of the pendulum mass, a smaller circumference or notch than the other plate disk, so that the plastic cage is recessed into the groove by means of the projection and can optionally form a clip connection or a latching connection. Alternatively, the projection can be pressed or clamped into the groove, and the plastic cage can therefore be connected frictionally to the pendulum mass.

Drawings

The invention is explained in detail on the basis of the embodiments shown in fig. 1 and 2. Shown here are:

FIG. 1 is a partial view of a pendulum mass of a centrifugal force pendulum with a plastic cage,

and

fig. 2 is a cross section of the pendulum mass of fig. 1.

Detailed Description

Fig. 1 shows a pendulum mass 1 in a view. The general structure of a centrifugal force pendulum is known from the cited prior art. The pendulum masses 1 are identically designed pendulum masses of a centrifugal pendulum distributed over the circumference.

The pendulum mass 1 has a slot 3 on its circumferential end face 2, into which a plastic cage 4 is inserted in a loss-proof manner on both sides. The plastic cage 4 has a cylindrical, blind-hole opening 5 into which an end surface region 7 of a helical compression spring 6 is inserted. This inhibits the coil pressure spring 6 from bending radially outward and contacting the pendulum mass 1. In the circumferential direction, further pendulum masses with the same plastic cage are arranged adjacent to the pendulum mass 1. The plastic cage 4 has an abutment region 8, which is widened relative to the opening 5 and which abuts against the end face 2 and which also serves as a collision damper for the pendulum masses 1 relative to one another when the helical compression spring 6 is fully compressed. The pendulum mass 1 is formed from three layered plate disks which are riveted to one another by means of rivets 9. The notches 15 arranged at intervals in the circumferential direction in the pendulum mass 1 each receive a rolling element 16 (for example a pendulum roller) which, when forming a pendulum bearing 17, rolls both on the guide rail 18 and in the notches of the following guide rails: the guide rails are arranged on two disks which axially surround the pendulum mass 1.

Fig. 2 shows pendulum mass 1 in a section through a plastic cage 4 with an opening 5, which receives a helical compression spring 6. The middle plate disc 10 is provided with a recess 13 in relation to the

outer plate discs

11, 12. For the axial fixing of the plastic cage in the pendulum mass 1, the plastic cage has a projection 14 which is sunk into the recess 13 and with which the projection can be latched, clipped, pressed or otherwise frictionally or positively connected for the fixing of the plastic cage 4.

In order to axially space the disks, not shown, of the pendulum mass carrier of the proposed centrifugal force pendulum, which disks are arranged on both sides of the pendulum mass 1, the plastic cage 4 has a widening 19 in the axial direction relative to the pendulum mass 1, which widening is, for example, 0.5mm to 1mm, preferably 0.8mm on each side, so that plastic spacers which are present on the disks or on the pendulum mass in any case can be omitted. The rolling bodies 16 are widened in the axial direction relative to the widened section 19 and engage in notches, not shown, of the disks arranged on both sides of the pendulum mass 1 and produce a rolling contact on rails that are configured complementarily to the rails 18 (fig. 1) of the pendulum mass 1.

List of reference numerals

1 pendulum mass

2 end side

3 notch

4 Plastic cage

5 opening

6 helical compression spring

7 end surface area

8 region of contact

9 rivet

10 plate type plate

11 plate type plate

12 plate type plate

13 groove

14 raised part

15 notch

16 rolling element

17 oscillating bearing

18 guide rail

19 widening section

Claims

1. A centrifugal force pendulum has a pendulum mass carrier and a pendulum mass (1), which are arranged so as to be rotatable about an axis of rotation, the pendulum masses are distributed in the circumferential direction and are received on the pendulum mass carrier by means of pendulum bearings of a predefined pendulum rail, wherein a helical compression spring (6) is arranged between each two pendulum masses (1) adjacent in the circumferential direction on the end side, characterized in that a slot (3) is provided in each case in the end face end of the pendulum mass (1), in which a plastic cage (4) receiving an end face region (7) of the helical compression spring (6) is received in a loss-proof manner, the plastic cage (4) has an axial widening (19) relative to the pendulum mass (1) and axially separates the pendulum flange or the side part from the pendulum mass (1).

2. Centrifugal force pendulum according to claim 1, characterized in that the plastic cage (4) is clipped into the pendulum mass (1).

3. Centrifugal force pendulum according to claim 1 or 2, characterized in that the plastic cage (4) has a cylindrical, blind-hole-like opening (5) which dips into the slot (3).

4. Centrifugal force pendulum according to claim 1, characterized in that the plastic cage (4) has an abutment region (8) which abuts against the end face (2) of the pendulum mass (1).

5. The centrifugal force pendulum according to claim 1, wherein the pendulum mass carrier is designed as a pendulum flange on which pendulum masses are arranged on both sides, wherein axially opposite pendulum masses are connected to form a pendulum mass unit by means of a connecting means which passes through a slot of the pendulum flange, wherein the helical compression spring arranged between two pendulum masses adjacent in the circumferential direction is arranged at least on one side of the pendulum flange.

6. The centrifugal force pendulum according to claim 1, characterized in that the pendulum mass carrier is formed by two disks having a receiving region, at which the two disks are spaced apart from one another in the axial direction, and in which the pendulum mass (1) is received.

7. Centrifugal force pendulum according to claim 1, characterized in that the pendulum mass (1) is formed by a plurality of layered plate disks (10, 11, 12), wherein at least one plate disk (10) arranged between the outer plate disks (11, 12) has a recess (13) into which the plastic cage (4) is sunk by means of a projection (14).