CN111981088A - Torsional vibration damper with centrifugal pendulum - Google Patents

Abstract

The invention relates to a torsional vibration damper (10) with a centrifugal pendulum for reducing torsional vibrations in a drive train of a vehicle, the torsional vibration damper having a spring element (40) which acts on a spring action On radius (42); damper members (44, 24) rotatable about the axis of rotation (20), damper members included for interposition between the damper members (44, 24) and the spring element (40) At least one spring engagement element (26) for transmitting force; centrifugal pendulum (46) comprising at least one pendulum mass (48) supported on damper members (44, 24) for limited movement along a swing track , the pendulum mass has a center of gravity ( 54 ) of the pendulum mass, wherein the spring element ( 40 ) is arranged axially offset relative to the pendulum mass ( 48 ) and the damper elements ( 44 , 24 ) have axially projecting A curved section (60) on which the spring engagement member (26) is arranged.

Description

Torsional vibration damper with centrifugal pendulum

technical field

The present invention relates to a torsional vibration damper.

Background technique

Torsional vibration dampers are known, for example, from DE 10 2018 115 945 A1. There is described a torsional vibration damper having an input part and an output part. During relative rotation of the input part and the output part about the axis of rotation, a circumferentially acting spring arrangement is arranged between the input part and the output part. The centrifugal pendulum is arranged on the output part in a rotationally fixed manner via the pendulum flange. A pendulum mass is arranged on both sides of the pendulum flange and is accommodated on the pendulum flange via a swivel bearing so as to be swivelable along a predetermined swivel path in the centrifugal force field of the output part rotatable about the axis of rotation.

In WO 2014 005 902 A1, a torsional vibration damper is described which has two disks spaced apart in the axial direction, the two disks enclosing a further damping component in the axial direction. Here, a disk element extends radially outward to form the pendulum flange of the centrifugal pendulum. The pendulum flange is integrated in the disc and is an integral part of the centrifugal pendulum. The pendulum flange of the centrifugal pendulum accommodates, in a radially outer section, two pendulum masses arranged axially opposite each other, which are connected to one another via spacer pins, wherein the spacer pins extend through the pendulum flange through arcuate openings.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to improve a torsional vibration damper. In particular, the torsional vibration damper should be constructed more cost-effectively and more compactly.

At least one of the technical problems is achieved by a torsional vibration damper in a drive train of a vehicle. The torsional vibration damper serves to reduce torsional vibrations and has: a spring element, which acts on the radius of action of the spring; at least one spring engagement for transmitting forces between elements; a centrifugal pendulum comprising at least one pendulum mass having a pendulum mass center of gravity, supported on a damper member for limited movement along a pendulum track, In this case, the spring element is arranged offset in the axial direction relative to the pendulum mass and the damper component has an axially protruding bending section on which the spring engaging element is arranged. As a result, the moment of inertia of the pendulum mass of the torsional vibration damper can be increased, and thus a sufficient damping capacity of the spring element can be provided. Torsional vibrations in the drive train can be better reduced. The installation space requirement of the torsional vibration damper can be reduced. The pendulum mass support, which is embodied separately from the damper member, can be dispensed with. Costs for torsional vibration dampers can be reduced. The number of components can be reduced.

Torsional vibration dampers can be installed in the drive train of a motor vehicle. The torsional vibration damper may be a dual mass flywheel with a primary side and a secondary side. The torsional vibration damper can be a hybrid damper, which is connected in particular upstream of the hybrid module. The hybrid damper can be arranged before or in the hybrid module. Torsional vibration dampers can be arranged upstream of the clutch. The clutch may be a wet-running or dry-running dual clutch.

The damper member may be a damper input member. The primary mass can be arranged or formed on the damper input part. The damper input part can be rotatably limited relative to the damper output part via the action of the spring element. The damper component may be a damper output component. The secondary mass can be arranged or formed on the damper output part. The damper output part can be rotatably limited relative to the damper input part via the action of the spring element. As a result, for example, torsional vibrations of the drive element, in particular of the internal combustion engine, can be effectively reduced. The damper member can be fixedly connected, for example riveted, to the driven disk hub.

The centrifugal pendulum can be designed for a specific excitation order of a drive element, eg an internal combustion engine. The centrifugal pendulum can be used as a buffer to match the rotational speed.

The spring element can be a helical spring, in particular a bow spring. At least two spring elements can be arranged offset on the circumference. The at least two pendulum masses can be arranged offset on the circumference. Here, the pendulum mass can overlap the spring element circumferentially.

In a preferred embodiment of the invention, the bending section is embodied in one piece with the damper component. The damper member can be embodied in the shape of a disk, and the curved section can project axially out of the plane of the damper member.

In a particular embodiment of the invention, the curved sections are arranged circumferentially offset relative to the pendulum mass. As a result, the pendulum mass can provide sufficient freedom of movement on the circumference. Two circumferentially offset curved sections can be arranged. The two pendulum masses can also be arranged offset on the circumference. A pendulum mass can be arranged on the circumference between the curved sections.

In a further special embodiment of the invention, the spring engaging element is arranged offset relative to the pendulum mass element only on the circumference. No spring engagement element is arranged in the region that spreads radially above and/or below the pendulum mass. The spring engagement member may be arranged circumferentially between the two pendulum mass members. The two spring engagement elements can be arranged offset on the circumference.

In a preferred embodiment of the invention, the center of gravity of the pendulum mass lies radially within the radius of action of the spring. The spring element can be arranged radially outside the pendulum mass. As a result, a sufficient damping capacity of the spring element can be provided.

In an advantageous embodiment of the invention, the center of gravity of the pendulum mass and the spring center of the spring element are arranged offset in the axial direction. The spring center can be the midpoint of the outer contour of the spring coil in a section plane containing the axis of rotation and sectioning through the spring element arranged in the torsional vibration damper.

In a particular embodiment of the invention, the spring engagement element is arranged radially outside the center of gravity of the pendulum mass. The center of force application between the spring engaging part and the spring element can be arranged radially outside the center of gravity of the pendulum mass.

In a preferred embodiment of the invention, the spring engaging element is arranged offset in the axial direction relative to the pendulum mass element. The curved section can cause an axial misalignment between the spring engagement member and the pendulum mass. The spring engaging means can act axially on the spring element in the middle.

In a particular embodiment of the invention, the spring engaging element protrudes radially from the curved section. The spring engaging element has a circumferential extension that is smaller than the circumferential extension of the curved section.

In a preferred embodiment of the invention, the damper member has at least one opening in which the pendulum mass is movably mounted. The opening can have at least one track profile on which the balance of the centrifugal pendulum can roll. The pendulum mass can be formed by at least two mass halves, which are mounted on the damper member so as to be movable on both sides in the axial direction. It is also possible to provide the pendulum mass with another mass part which is axially movable together with the pendulum mass within the damper element.

Description of drawings

Further advantages and advantageous configurations of the invention can be derived from the description of the drawings and the figures.

The present invention will be described in detail below with reference to the accompanying drawings. The accompanying drawings specifically show:

Figure 1a shows a side view of a torsional vibration damper in a particular embodiment of the present invention.

Figure 1b shows a perspective cross-sectional view along section line A-A of the torsional vibration damper of Figure 1a.

Figure 2a shows a side view of the torsional vibration damper of Figure 1a.

Figure 2b shows a perspective cross-sectional view along the section line B-B of the torsional vibration damper of Figure 2a.

FIG. 3 shows a partial perspective view of the torsional vibration damper of FIG. 1 .

FIG. 4 shows a partial perspective view of the torsional vibration damper of FIG. 3 .

Detailed ways

Figure 1a shows a side view of a torsional vibration damper 10 in a particular embodiment of the present invention. Torsional vibration dampers may be provided in the drive train of the vehicle. Torsional vibrations introduced into the drive train from a drive element, such as an internal combustion engine, can be reduced by the torsional vibration damper 10 .

The torsional vibration damper 10 has a damper input part 12 which is coupled to the damper output part via two spring elements which are each arranged in a spring receptacle 14 . The damper output part is in turn riveted to the driven disk hub 16 . The driven disk hub 16 has teeth 18 on the inner circumference for connection with the driven shaft.

A perspective cross-sectional view along section line A-A of the torsional vibration damper of FIG. 1 a is shown in FIG. 1 b. The damper input part 12 , which is rotatable about the axis of rotation 20 , is embodied in two parts. The two parts are fixedly connected to each other at the outer circumference. The damper input part 12 is operatively connected to two spring elements (not visible here), which are each arranged in spring receptacles 14 of the damper input part 12 . In this case, the damper input part 12 has spring joints 22 for force transmission between the damper input part 12 and the spring element, respectively.

The damper input part 12 is connected to the damper output part 24 via the action of two spring elements. The damper output member 24 is rotatably limited relative to the damper input member 12 . The damper output part 24 has, on the radially outer section, a spring engagement part 26 , by means of which a force transmission takes place between the damper output part 24 and the spring element.

The damper output member 24 is riveted to the driven disc hub 16 . A coil spring 30 is arranged between the driven disk hub 16 and the damper input part 12 , the coil spring is riveted to the driven disk hub 16 and is rotatable relative to the damper input part 12 and bears against the damper on the input part 12 . A spacer element 32 , for example a plastic ring, is also arranged between the driven disk hub 16 and the damper input part 12 .

The torsional vibration damper 10 is designed as a dual-mass flywheel, wherein the damper input part 12 is designed as the primary side 34 and the damper output part 24 is designed as the secondary side 36 . A primary mass 38 for increasing the moment of inertia of the primary side 34 is fastened to the damper input part 12 .

Figure 2a shows a side view of the torsional vibration damper of Figure 1a.

A perspective cross-sectional view along section line B-B of the torsional vibration damper 10 of FIG. 2a is shown in FIG. 2b. The spring element 40 is embodied as a bow spring and is accommodated in the spring receptacle 14 in the damper input part 12 . The spring element 40 has a spring action radius 42 . A total of two spring elements 40 are arranged circumferentially offset in the torsional vibration damper 10 . The damper output part 24 forms a damper member 44 on which a centrifugal pendulum 46 is arranged. A pendulum mass 48 of the centrifugal pendulum 46 , which is mounted so as to be movable along a swivel path, is accommodated on the damper element 44 . The pendulum mass 48 consists of two mass halves 50 . Here, the two mass halves 50 are connected to each other, for example, via at least one spacer pin.

The damper member 44 has at least one opening 52 in which at least one balance wheel of the centrifugal pendulum 46 is rollably received. The pendulum mass 46 can be moved along the oscillating path by means of the bearing via the balance wheel and the correspondingly shaped opening 52 , whereby in addition to the action of the spring element 42 , it also acts as a rotational speed-adapted damper to reduce torsional vibrations. The centrifugal pendulum 46 can be designed for a specific excitation order of a drive element, eg an internal combustion engine.

The spring element 40 is arranged offset in the axial direction relative to the pendulum mass 48 . As a result, the moment of inertia of the pendulum mass 48 and the damping capacity of the spring element can be increased. The pendulum mass 48 has a center of gravity 54 of the pendulum mass located radially within the spring action radius 44 . The spring element 40 is arranged radially outside the pendulum mass 48 . The center of gravity 54 of the pendulum mass and the spring center 56 of the spring element 40 are arranged axially offset by an axial distance 58 .

FIG. 3 shows a partial perspective view of the torsional vibration damper 10 of FIG. 1 . The damper component 44 formed by the damper output part 24 has, on a radially outer section, two spring joints 26 which are arranged circumferentially offset. In this case, the spring joints 26 are each formed in one piece by the damper elements 44 .

The damper member 44 accommodates two pendulum masses 48 of the centrifugal pendulum 46 , which are arranged offset on the circumference and are movable in a limited manner relative to the damper member 44 . The spring engagement elements 26 are each arranged offset only circumferentially relative to the pendulum mass element 48 . The spring engaging elements 26 are respectively arranged circumferentially between the two pendulum mass elements 48 .

The pendulum mass 48 has a pendulum mass center of gravity 54 . The spring engagement member 26 is arranged radially outside the center of gravity 54 of the pendulum mass. The spring engagement piece 26 protrudes radially from a curved section 60 which is formed in one piece from the damper member 44 and projects axially from the damper member. Two curved sections 60 , which are arranged offset on the circumference, are formed on the damper component 44 . There are pendulum masses 48 on the circumference between the curved sections 60 . The corresponding curved section 60 causes an axial misalignment between the spring engagement member 26 and the pendulum mass 48 . Thus, the pendulum mass 48 and the spring element can be arranged on a sufficiently large radius. As a result, the moment of inertia of the pendulum mass of the torsional vibration damper 10 can be increased and thus a sufficient damping capacity of the spring element can be provided.

FIG. 4 shows a partial perspective view of the torsional vibration damper 10 of FIG. 3 . The damper element 44 formed by the damper output part 24 has an opening 52 for each pendulum mass (not shown here), in which opening two balance wheels can be accommodated, by which the pendulum masses are supported on the damper. The vibrator member 44 is movable along the swing track. For this purpose, each opening 52 has two orbital profiles 62 for each balance wheel. Here, the shape of the track profile 62 influences the oscillating track. The desired oscillating track can be achieved in conjunction with the support of the balance wheel and the balance wheel in the pendulum mass by means of a suitable design of the track profile 62 .

List of reference signs

10 Torsional vibration dampers

12 Shock absorber input part

14 Spring receiver

16 Driven hub

18 teeth

20 Rotation axis

22 Spring joint

24 Shock absorber output part

26 Spring joint

30 coil spring

32 Spacer elements

34 Primary side

36 Secondary side

38 Primary quality parts

40 sub-quality parts

42 Spring action radius

44 Shock absorber components

46 Centrifugal Pendulum

48 pendulum pieces

50 mass halves

52 openings

54 Center of gravity of pendulum mass

56 Spring Center

58 Axial spacing

60 Bend section

62 Track profile

Claims (10)

1. A torsional vibration damper (10) for reducing torsional vibrations in a drive train of a vehicle, the torsional vibration damper having: a spring element (40) acting on the spring action radius (42); A damper member (44, 24) rotatable about an axis of rotation (20), said damper member comprising for interposition between said damper member (44, 24) and said spring element (40) at least one spring engagement member (26) for transmitting force; Centrifugal pendulum (46) comprising at least one pendulum mass (48) supported on said damper member (44, 24) for limited movement along a pendulum track, said pendulum mass having a pendulum mass center of gravity (54), It is characterized in that the spring element (40) is arranged offset in the axial direction relative to the pendulum mass (48) and the damper element (44, 24) has an axially protruding curved section (60). ), the spring engagement piece (26) is arranged on the curved section. 2 . The torsional vibration damper ( 10 ) according to claim 1 , wherein the bending section ( 60 ) is embodied in one piece with the damper component ( 44 , 24 ). 3 . 3 . The torsional vibration damper ( 10 ) according to claim 1 , wherein the bending section ( 60 ) is arranged circumferentially offset relative to the pendulum mass ( 48 ). 4 . 4 . The torsional vibration damper ( 10 ) according to claim 1 , characterized in that the spring engagement element ( 26 ) is only circumferentially offset relative to the pendulum mass element ( 48 ). 5 . . 5 . The torsional vibration damper ( 10 ) according to claim 1 , wherein the pendulum mass center of gravity ( 54 ) is located radially within the spring action radius ( 42 ). 6 . 6 . The torsional vibration damper ( 10 ) according to claim 1 , wherein the center of gravity ( 54 ) of the pendulum mass and the spring center ( 56 ) of the spring element ( 40 ) are along the Axially offset. 7 . The torsional vibration damper ( 10 ) according to claim 1 , wherein the spring engagement element ( 26 ) is arranged radially outside the center of gravity ( 54 ) of the pendulum mass. 8 . . 8 . The torsional vibration damper ( 10 ) according to claim 1 , wherein the spring engagement element ( 26 ) is arranged axially offset relative to the pendulum mass element ( 48 ). 9 . 9 . The torsional vibration damper ( 10 ) according to claim 1 , wherein the spring engagement element ( 26 ) protrudes radially from the bending section ( 60 ). 10 . 10. Torsional vibration damper (10) according to any one of the preceding claims, characterized in that the damper member (44, 24) has at least one opening (52), the pendulum mass (48) is movably supported in the at least one opening.

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