Torsional vibration damper with centrifugal pendulum

Abstract

The invention relates to a torsional vibration damper (10) with a centrifugal pendulum, which is in a drive train of a vehicle and is used for reducing torsional vibrations, the torsional vibration damper having: a spring element (40) which acts on a spring action radius (42); a damper component (44, 24) which is rotatable about an axis of rotation (20), the damper component comprising at least one spring engagement element (26) for transmitting force between the damper component (44, 24) and the spring element (40); a centrifugal pendulum (46) which comprises at least one pendulum mass (48) which is supported on the damper component (44, 24) so ​​as to be movable along a pendulum path, the pendulum mass having a pendulum mass center of gravity (54), wherein the spring element (40) is arranged offset in the axial direction relative to the pendulum mass (48), and the damper component (44, 24) has an axially protruding curved section (60), on which the spring engagement element (26) is arranged.

Description

Technical Field

[0001] The invention relates to a torsional vibration damper. Background Art

[0002] Torsional vibration dampers are known, for example, from DE 10 2018 115 945 A1. A torsional vibration damper having an input part and an output part is described therein. When the input part and the output part rotate relative to each other about the axis of rotation, a spring device acting in the circumferential direction 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 a pendulum flange. A pendulum mass is arranged on both sides of the pendulum flange, and the pendulum mass is accommodated on the pendulum flange in a swingable manner along a predetermined swinging track in the centrifugal force field of the output part that can rotate about the axis of rotation via a swing bearing.

[0003] WO 2014 005 902 A1 describes a torsional vibration damper having two axially spaced disks, which surround another damping component in the axial direction. Here, one disk is extended radially outward to form a pendulum flange of a centrifugal pendulum. The pendulum flange is integrated in the disk and is a component of the centrifugal pendulum. The pendulum flange of the centrifugal pendulum accommodates two axially oppositely arranged pendulum masses in a radially outer section, which are connected to each other via a spacer pin, wherein the spacer pin passes through the pendulum flange through an arc-shaped opening. Summary of the invention

[0004] 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 designed to be more cost-effective and more compact.

[0005] 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 is used to reduce torsional vibrations and has: a spring element, which acts on a spring action radius; a damper component that can rotate about a rotation axis, the damper component comprising at least one spring engagement member for transmitting force between the damper component and the spring element; a centrifugal pendulum, which comprises at least one pendulum mass member supported on the damper component in a limited manner along a swing track, the pendulum mass member having a pendulum mass center of gravity, wherein the spring element is arranged axially offset relative to the pendulum mass member and the damper component has an axially extending curved section, the spring engagement member being arranged on the curved section. As a result, the rotational inertia of the pendulum mass member of the torsional vibration damper can be increased, and thus sufficient damping capacity of the spring element can be provided. Torsional vibrations in the drive train can be better reduced. The structural space requirement of the torsional vibration damper can be reduced. The pendulum mass member support that is implemented separately from the damper component can be omitted. The cost for the torsional vibration damper can be reduced. The number of components can be reduced.

[0006] The torsional vibration damper can be installed in the drive train of a motor vehicle. The torsional vibration damper can be a dual mass flywheel with a primary side and a secondary side. The torsional vibration damper can be a hybrid damper, which is in particular connected upstream of a hybrid module. The hybrid damper can be arranged upstream of a hybrid module or in the hybrid module. The torsional vibration damper can be arranged upstream of a clutch. The clutch can be a wet-running or dry-running dual clutch.

[0007] The damper component may be a damper input component. A primary mass component may be arranged or constructed on the damper input component. The damper input component may be limitedly rotatable relative to the damper output component via the action of a spring element. The damper component may be a damper output component. A secondary mass component may be arranged or constructed on the damper output component. The damper output component may be limitedly rotatable relative to the damper input component via the action of a spring element. This may effectively reduce, for example, torsional vibrations of a drive element, in particular an internal combustion engine. The damper component may be fixedly connected to the driven hub, for example, by riveting.

[0008] The centrifugal pendulum can be designed for a specific excitation order of a drive element, such as an internal combustion engine. The centrifugal pendulum can be used as a speed-adapting damper.

[0009] 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. At least two pendulum masses can be arranged offset on the circumference. Here, the pendulum mass can overlap with the spring element on the circumference.

[0010] In a preferred embodiment of the invention, the bent section is designed in one piece with the damper component. The damper component can be designed in a disk-like shape, and the bent section can protrude axially from the plane of the damper component.

[0011] In a special embodiment of the invention, the bending section is arranged offset relative to the pendulum mass on the circumference. As a result, the pendulum mass can provide sufficient freedom of movement on the circumference. Two bending sections arranged offset on the circumference can be arranged. Two pendulum masses can also be arranged offset on the circumference. The pendulum mass can be arranged between the bending sections on the circumference.

[0012] In another special embodiment of the present invention, the spring engagement member is arranged offset relative to the pendulum mass only on the circumference. In the area extending radially above and / or below the pendulum mass, no spring engagement member is arranged. The spring engagement member can be arranged circumferentially between the two pendulum mass members. The two spring engagement members can be arranged offset on the circumference.

[0013] In a preferred embodiment of the present invention, the center of gravity of the pendulum mass is radially located within the spring action radius. The spring element can be arranged radially outside the pendulum mass, thereby providing sufficient vibration damping capacity of the spring element.

[0014] In an advantageous embodiment of the invention, the pendulum mass center of gravity and the spring center of the spring element are arranged axially offset. In a section plane containing the rotation axis and cutting through the spring element arranged in the torsional vibration damper, the spring center can be the center point of the outer contour of the spring coil.

[0015] In a special embodiment of the invention, the spring engagement element is arranged radially outside the center of gravity of the pendulum mass. The force action center between the spring engagement element and the spring element can be arranged radially outside the center of gravity of the pendulum mass.

[0016] In a preferred embodiment of the present invention, the spring engagement member is arranged offset relative to the pendulum mass member in the axial direction. The bending section can cause an axial offset between the spring engagement member and the pendulum mass member. The spring engagement member can act on the spring element in the middle in the axial direction.

[0017] In a special embodiment of the present invention, the spring engagement piece protrudes radially from the curved section. The spring engagement piece has an extension on the circumference which is smaller than the extension on the circumference of the curved section.

[0018] In a preferred embodiment of the present invention, the damper component has at least one opening, in which the pendulum mass is movably supported. The opening may have at least one track profile, on which the pendulum wheel of the centrifugal pendulum can roll. The pendulum mass may be composed of at least two mass halves, which are movably supported on both sides of the damper component in the axial direction. The pendulum mass may also be equipped with another mass component, which can move together with the pendulum mass in the axial direction within the damper component. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Further advantages and advantageous embodiments of the invention are apparent from the description of the drawings and the figures.

[0020] The present invention is described in detail below with reference to the accompanying drawings. The accompanying drawings specifically show:

[0021] Figure 1a A side view of a torsional vibration damper is shown in a special embodiment of the invention.

[0022] Figure 1b Shown along Figure 1a A three-dimensional sectional view of the torsional vibration damper along the cutting line AA.

[0023] Figure 2a Shows Figure 1aSide view of a torsional vibration damper.

[0024] Figure 2b Shown along Figure 2a A three-dimensional sectional view of a torsional vibration damper along the cutting line BB.

[0025] Figure 3 A perspective view of a detail of the torsional vibration damper from FIG. 1 is shown.

[0026] Figure 4 Shows Figure 3 A three-dimensional view of a portion of a torsional vibration damper. DETAILED DESCRIPTION

[0027] Figure 1a A side view of a torsional vibration damper 10 in a special embodiment of the invention is shown. The torsional vibration damper can be arranged in a drive train of a vehicle. The torsional vibration damper 10 can be used to reduce torsional vibrations introduced into the drive train from a drive element, for example an internal combustion engine.

[0028] The torsional vibration damper 10 has a damper input part 12, which is coupled to a damper output part via two spring elements, each of which is arranged in a spring receptacle 14. The damper output part is in turn riveted to an output hub 16. The output hub 16 has a toothing 18 on its inner circumference for connection to a driven shaft.

[0029] exist Figure 1b It is shown along Figure 1a . The damper input part 12, which can rotate about an axis of rotation 20, is designed in two parts. The two parts are fixedly connected to each other at the periphery. The damper input part 12 is operatively connected to two spring elements (not visible here), which are each arranged in a spring receptacle 14 of the damper input part 12. The damper input part 12 has a spring coupling 22 for transmitting force between the damper input part 12 and the spring element.

[0030] The damper input part 12 is connected to the damper output part 24 via the action of two spring elements. The damper output part 24 can be rotated in a limited manner relative to the damper input part 12. The damper output part 24 has a spring joint 26 on a radially outer section, by means of which force is transmitted between the damper output part 24 and the spring element.

[0031] The damper output component 24 is riveted to the driven hub 16. A disc spring 30 is arranged between the driven hub 16 and the damper input component 12, the disc spring is riveted to the driven hub 16, and the disc spring can rotate relative to the damper input component 12 and abuts against the damper input component 12. A spacing element 32, such as a plastic ring, is also arranged between the driven hub 16 and the damper input component 12.

[0032] Torsional vibration damper 10 is designed as a dual mass flywheel, wherein damper input part 12 is designed as primary side 34 and damper output part 24 is designed as secondary side 36. A primary mass 38 is attached to damper input part 12 for increasing the moment of inertia of primary side 34.

[0033] Figure 2a Shows Figure 1a Side view of a torsional vibration damper.

[0034] exist Figure 2b It is shown along Figure 2a 3D sectional view of the torsional vibration damper 10 along the section line BB. The spring element 40 is implemented 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 in the torsional vibration damper 10 in a circumferentially offset manner. The damper output part 24 forms a damper component 44, and a centrifugal pendulum 46 is arranged on the damper component. A pendulum mass 48 of the centrifugal pendulum 46, which can be supported in a limited manner along the swing track, is accommodated on the damper component 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.

[0035] The damper component 44 has at least one opening 52, in which at least one pendulum of the centrifugal pendulum 46 is rollably received. The pendulum mass 46 can move along the pendulum path by being supported via the pendulum and the correspondingly shaped opening 52, thereby reducing torsional vibrations as a speed-adapted damper in addition to the effect of the spring element 42. The centrifugal pendulum 46 can be designed for a specific excitation order of a drive element, such as an internal combustion engine.

[0036] The spring element 40 is arranged axially offset 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 pendulum mass center of gravity 54 which is radially located within the spring action radius 44. The spring element 40 is arranged radially outside the pendulum mass 48. The pendulum mass center of gravity 54 and the spring center 56 of the spring element 40 are arranged axially offset at an axial spacing 58.

[0037] Figure 31 shows a perspective view of a section of the torsional vibration damper 10. The damper component 44 formed by the damper output part 24 has two circumferentially offset spring engagement elements 26 on the radial outer section. The spring engagement elements 26 are each formed in one piece by the damper component 44.

[0038] The damper component 44 accommodates two pendulum masses 48 of the centrifugal pendulum 46, which are arranged offset on the circumference and can be limitedly moved relative to the damper component 44. The spring engagement parts 26 are respectively arranged offset only on the circumference relative to the pendulum masses 48. The spring engagement parts 26 are respectively arranged between the two pendulum masses 48 on the circumference.

[0039] The pendulum mass 48 has a pendulum mass center of gravity 54. The spring engagement member 26 is arranged radially outside the pendulum mass center of gravity 54. The spring engagement member 26 protrudes radially from a curved section 60, which is integrally formed by the damper component 44 and protrudes axially from the damper component. Two curved sections 60 are formed on the damper component 44 and are arranged offset on the circumference. The pendulum mass 48 is located between the curved sections 60 on the circumference. The corresponding curved sections 60 cause an axial offset between the spring engagement member 26 and the pendulum mass 48. Therefore, the pendulum mass 48 and the spring element can be arranged on a sufficiently large radius. As a result, the rotational inertia of the pendulum mass of the torsional vibration damper 10 can be increased and thus provide a sufficient damping capacity of the spring element.

[0040] exist Figure 4 It is shown in Figure 3 3D view of a portion of a torsional vibration damper 10. The damper component 44 formed by the damper output part 24 has an opening 52 for each pendulum mass (not shown here), in which two balance wheels can be accommodated, and the pendulum mass parts are supported on the damper component 44 via the balance wheels and can move along the pendulum track. For this purpose, each opening 52 has two track profiles 62 for the balance wheels. Here, the shape of the track profile 62 affects the pendulum track. Through the appropriate design of the track profile 62, the desired pendulum track can be achieved in combination with the balance wheel and the support of the balance wheel in the pendulum mass.

[0041] Reference numerals list

[0042] 10 Torsional vibration damper

[0043] 12 Damper input component

[0044] 14 Spring receiving portion

[0045] 16 Driven hub

[0046] 18 Teeth

[0047] 20 Rotation axis

[0048] 22 Spring joint

[0049] 24 Shock absorber output part

[0050] 26 Spring joint

[0051] 30 Coil Spring

[0052] 32 Spacer element

[0053] 34 Primary side

[0054] 36 Secondary side

[0055] 38 Primary quality parts

[0056] 40 Secondary quality parts

[0057] 42 Spring action radius

[0058] 44 shock absorber components

[0059] 46 Centrifugal Pendulum

[0060] 48 Pendulum mass

[0061] 50 mass half

[0062] 52 Opening

[0063] 54 Pendulum mass center of gravity

[0064] 56 Spring Center

[0065] 58 Axial spacing

[0066] 60 Bend Section

[0067] 62 Track Profile

Claims

1. A torsional vibration damper (10) for reducing torsional vibrations in a drive train of a vehicle, the torsional vibration damper comprising: a spring element (40) acting on a spring action radius (42); A damper component (44, 24) rotatable about an axis of rotation (20), the damper component comprising at least one spring engagement member (26) for transmitting force between the damper component (44, 24) and the spring element (40); A centrifugal pendulum (46) comprising at least one pendulum mass (48) supported on the damper component (44, 24) in a limited manner along a pendulum path, the pendulum mass having a pendulum mass center of gravity (54), The invention is characterized in that the spring element (40) is arranged axially offset relative to the pendulum mass (48) and the damper component (44, 24) has an axially protruding curved section (60) on which the spring engagement element (26) is arranged.

2. The torsional vibration damper (10) according to claim 1, characterized in that The bent section (60) is designed in one piece with the damper component (44, 24).

3. The torsional vibration damper (10) according to claim 1 or 2, characterized in that: The curved section (60) is arranged offset on the circumference relative to the pendulum mass (48).

4. The torsional vibration damper (10) according to claim 1 or 2, characterized in that: The spring engagement element (26) is arranged offset only on the circumference relative to the pendulum mass element (48).

5. The torsional vibration damper (10) according to claim 1 or 2, characterized in that: The center of gravity (54) of the pendulum mass member is located radially within the spring action radius (42).

6. The torsional vibration damper (10) according to claim 1 or 2, characterized in that: The center of gravity (54) of the pendulum mass and the spring center (56) of the spring element (40) are arranged axially offset.

7. The torsional vibration damper (10) according to claim 1 or 2, characterized in that: The spring engagement element (26) is arranged radially outside the center of gravity (54) of the pendulum mass element.

8. The torsional vibration damper (10) according to claim 1 or 2, characterized in that: The spring engagement element (26) is arranged offset in the axial direction relative to the pendulum mass element (48).

9. The torsional vibration damper (10) according to claim 1 or 2, characterized in that: The spring engagement member (26) protrudes radially from the bent section (60).

10. The torsional vibration damper (10) according to claim 1 or 2, characterized in that The damper component (44, 24) has at least one opening (52) in which the pendulum mass (48) is movably mounted.

Images