DE102017122463A1 - torsional vibration dampers - Google Patents

Abstract

The invention relates to a torsional vibration damper (1) for damping torsional vibrations, in particular in the drive train of a motor vehicle, with a primary element (2) and with a secondary element (3), which are rotatable relative to each other against the restoring force of a spring damper (4), wherein the spring damper (4) spring elements (5) which are supported on the primary element (2) in the circumferential direction, wherein radially between the primary element (2) and the spring elements (5) sliding shells (7) are provided, to which the spring elements (5) supported in the radial direction, wherein the secondary element (3) has a flange (6) which is supported on the spring elements (5) in the circumferential direction, wherein the sliding shells (7) as a ring element (8) are formed interconnected and with the flange ( 6) of the secondary element (3) are rotatably connected and are arranged rotatable relative to the primary element (2).

Description

The invention relates to a torsional vibration damper, in particular for the drive train of a motor vehicle.

Torsional vibration dampers are widely known in the art, for example in the form of dual-mass flywheels or similar. In this case, a torsional vibration damper on a primary element and a secondary element, which are arranged rotatable relative to each other. Between the primary element and the secondary element, a spring damper device is arranged with spring elements, so that the secondary element is rotatable relative to the primary element against the restoring force of the spring elements.

The DE 10 2006 030 136 A1 and the DE 10 2007 011 779 A1 disclose that the spring elements, for example formed as bow springs, are supported radially on the outside radially supported by a sliding shell on the primary element. In this case, the spring element slides in a loading of a flange of the secondary element with its spring coils on the sliding shell, wherein it can be supported end to a peripheral stop of the primary element. In this case, the spring elements can rest directly on the sliding shell radially outside or with the interposition of a sliding shoe, as it DE 10 2006 030 136 A1 and the DE 10 2007 011 779 A1 reveal. In a torsional vibration damper according to the prior art, the spring elements, for example as bow springs, are in the sliding shell and are pushed by the flange through the sliding shell as a web, wherein the sliding shell is arranged stationary with the primary element.

In particular, in direct contact of the spring coils on the sliding shell, it may happen that the frictional force between the spring element and the sliding shell or the friction between the spring element and the sliding shell is greater than the acting force or as the acting torque of the flange on the spring element, so that the spring element could get stuck on the sliding shell.

After certain driving maneuvers, for example, a so-called acceleration pressure or so-called bouncing may occur. In this case, bouncing is a striking or knocking of the flange on a spring element. If the flange meets the tensioned in the spring channel spring element, such as a bow spring, it can bounce at a low engine torque on the spring element or accelerate the block as tensioned spring element when the friction torque is exceeded to push suddenly through the spring channel during acceleration, which is interpreted as acceleration , Both phenomena are also based on the friction between the spring element and the sliding shell. At high speeds, the torques occurring due to the frictional force depending on the embodiment of the torsional vibration damper may well be greater than 500 Nm.

It is the object of the present invention to provide a torsional vibration damper, which is improved in the appearance of such phenomena and yet simple in construction.

The object of the invention is achieved with the features of claim 1.

An embodiment of the invention relates to a torsional vibration damper for damping torsional vibrations, in particular in the drive train of a motor vehicle, with a primary element and a secondary element, which are rotatable relative to the restoring force of a spring damper relative to each other, wherein the spring damper spring elements, which extends to the primary element in the circumferential direction supporting, wherein radially between the primary element and the spring elements sliding shells are provided, on which the spring elements are supported in the radial direction, wherein the secondary element has a flange which is supported on the spring elements in the circumferential direction, wherein the sliding shells are formed interconnected as a ring element and are rotatably connected to the flange of the secondary element and are arranged rotatable relative to the primary element. This ensures that the sliding shells always rotate with the flange. If the sliding cup is designed as a ring and firmly connected to the flange, it always rotates with it. In the case of the acceleration pressure so stretched at high speeds spring element, such as bow spring, would no longer lie in a position change in the channel at its position until the engine torque is higher than the friction torque, but are taken from the sliding shell to the spring stop in the channel spring elements. Thus, a jerky and unexpected for the driver pushing through the spring element can be avoided. The effect of the bounce is also prevented because the motor excitation is transmitted not only by the contact of the flange on the spring element but, at high speeds, also on the frictional contact between co-rotating sliding shell and the spring element.

It is advantageous in one embodiment that the ring element is arranged at a distance from the primary element on the flange of the secondary element. This will cause a frictional contact between avoided the ring member and the primary element, which could adversely affect the torsional vibration damping.

It is advantageous if the rigidity of the ring element is so high that the deflection of the ring element due to centrifugal forces during operation of the torsional vibration damper is so low that the ring element does not contact touching the primary element in contact. In this case, the ring element can be optimized by its choice of material or its thickness in the stiffness such that the possible deflection occurring does not lead to a contact of the ring member to the primary element.

Alternatively, it is also advantageous if the radial element between the ring element and the primary element a sliding element is arranged, that the ring element is supported by centrifugal force on the sliding element. This reduces the friction in the case of touching.

The present invention will be explained in more detail below with reference to preferred exemplary embodiments in conjunction with the associated figures:

• 1 eine schematische Darstellung eines Drehschwingungsdämpfers gemäß der Erfindung.

Showing:

• 1 a schematic representation of a torsional vibration damper according to the invention.

The 1 shows a schematic representation of a torsional vibration damper 1 for damping torsional vibrations, in particular in the drive train of a motor vehicle.

The torsional vibration damper has a primary element 2 and a secondary element 3 on, with the primary element 2 preferably on the input side and the secondary element 3 is arranged on the output side, so that a torque preferably from the primary element 2 in train operation on the secondary element 3 is transmitted. Alternatively, the primary element 2 preferably also on the output side and the secondary element 3 Be arranged on the input side, so that a torque preferably from the secondary element 3 in train operation on the primary element 2 is transmitted.

Between the primary element 2 and the secondary element 3 is a spring damper 4 with spring elements 5 provided so that primary element 2 against the restoring force of the spring damper 4 relative to the secondary element 3 is rotatable.

The spring damper 4 has spring elements 5 on, on the one hand, on the primary element 2 supported in the circumferential direction. The secondary element 3 has a flange element 6 on, which is attached to the spring elements 5 supported on the other hand in the circumferential direction. By the rotation between primary element 2 and secondary element 3 or its flange element 6 become the spring elements 5 applied.

The spring elements 5 are preferably bow springs whose length in the circumferential direction is greater by a multiple than their diameter in the radial direction. Preferably, the bow springs are already curved, so that they already assume an arcuate contour in the relaxed, not acted upon state.

As in 1 it can be seen are radially between the primary element 2 and the spring elements 5 sliding shells 7 provided, on which the spring elements 5 supported in the radial direction. In this case, the spring elements 5 supported with their spring coils directly on the sliding shells or alternatively indirectly via sliding shoes.

Here are the sliding shells 7 as a ring element 8th formed interconnected, which forms a closed ring. The ring element 8th is with the flange element 6 or with the flange elements 6 of the secondary element 3 rotatably connected. Furthermore, the ring element 8th , which the sliding shells 7 forms, opposite the primary element 2 rotatably arranged.

In an advantageous embodiment, the ring element 8th radially spaced from the primary element 2 on the flange element 6 of the secondary element 2 arranged. This is possible because the ring element is held by the flange element of the secondary element. This is an at least small gap 9 between the ring element 8th and the primary element 2 before, so that the ring element 8th preferably not rubbing on the primary element.

It is particularly advantageous if the rigidity of the ring element 8th so high is that the deflection of the ring element 8th due to centrifugal forces, in particular the spring elements 5 on the ring element 8th , in the operation of the torsional vibration damper is so low that the ring element 8th not on the primary element 2 touchingly contacts.

Optionally, however, may be radially between the ring member 8th and the primary element 2 a sliding element 10 be arranged so that the ring element 8th under centrifugal force on the sliding element 10 can support.

LIST OF REFERENCE NUMBERS

1

torsional vibration dampers

2

primary element

3

secondary element

4

spring shock absorber

5

spring elements

6

flange

7

sliding shells

8th

ring element

9

gap

10

Slide

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102006030136 A1 [0003]
• DE 102007011779 A1 [0003]

Claims (4)

Torsional vibration damper (1) for damping torsional vibrations, in particular in the drive train of a motor vehicle, with a primary element (2) and with a secondary element (3), which are opposite to the restoring force of a spring damper (4) rotatable relative to each other, wherein the spring damper (4) spring elements (5), which are supported on the primary element (2) in the circumferential direction, wherein radially between the primary element (2) and the spring elements (5) sliding shells are provided, on which the spring elements (5) are supported in the radial direction, wherein the Secondary element (3) has a flange (6) which is supported on the spring elements (5) in the circumferential direction, characterized in that the sliding shells are formed as a ring element (8) connected to each other and with the flange (6) of the secondary element (3) are rotatably connected and are arranged rotatable relative to the primary element (2). Torsional vibration damper (1) after Claim 1 , characterized in that the ring element (8) spaced from the primary element (2) on the flange (6) of the secondary element (3) is arranged. Torsional vibration damper (1) after Claim 1 or 2 , characterized in that the rigidity of the ring member (8) is so high that the deflection of the ring member (8) due to centrifugal forces in the operation of the torsional vibration damper (1) is so small that the ring member (8) not on the primary element (2 ) touchingly contacts. Torsional vibration damper (1) after Claim 1 or 2 , characterized in that radially hissing the ring element (8) and the primary element (2) a sliding element (10) is arranged, that the ring element (8) under centrifugal force on the sliding element (10) is supported.

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