DE102019119755A1 - Vibration damper with wear indicator marking for functional checking - Google Patents

Abstract

The invention relates to a vibration damper (1) for a motor vehicle drive train, with a hub (3) rotatably arranged around an axis of rotation (2) and a disc element (5) connected to the hub (3) via an elastic plastic connector (4), with a wear indicator marking (7) is attached to a common axial side (6) of the hub (3) and the disk element (5) in such a way that a first part (8) of the wear indicator marking (7) provided on the hub (3) in a radial direction offset from the axis of rotation (2) and overlapping in the circumferential direction with respect to a second part (9) of the wear indicator marking (7) provided on the disk element (5).

Description

The invention relates to a vibration damper for a motor vehicle drive train (preferably driven by an internal combustion engine), with a hub rotatable about an axis of rotation and a disc element connected to the hub via an elastic plastic connector. The vibration damper is typically implemented directly as a crankshaft vibration damper.

Generic crankshaft vibration dampers, which are often designed as single-mass flywheels, are in principle subject to a certain amount of wear. In particular, the plastic connectors used, which are usually made of elastomer, are strongly influenced by the ambient conditions during operation of the motor vehicle in the engine compartment. B. leads to considerable aging of the material. It is precisely the thermal stress and the high dynamic load that lead to accelerated aging, which even by adding appropriate aging inhibitors cannot be prevented, but only slowed down. In addition, existing crankshaft vibration dampers have so far not been taken into account in the maintenance plan at the corresponding maintenance intervals. Although some sales organizations in the automotive aftermarket recommend checking the crankshaft vibration damper after a service life of 60,000 km and replacing it after about 120,000 km (or at the latest 10 years), the check to be carried out has so far been hardly practicable and therefore involves a lot of effort.

It is therefore the object of the present invention to remedy the disadvantages explained above and to provide a vibration damper which, when installed on the drive train side, can be checked with the least possible effort with regard to its state of wear.

This is achieved according to the invention by the subject matter of claim 1, wherein a wear indication mark is attached to a common axial side of the hub and the disk element in such a way that a first part of the wear indication mark provided on the hub is offset in a radial direction of the axis of rotation and overlaps in the circumferential direction (ie in the circumferential direction at least in sections at the same height) is arranged to a second part of the wear indicating marking provided on the disk element.

By means of such a marking, the state of wear of the vibration damper can be easily checked in a corresponding test process. To do this, the vehicle only needs to be driven a few kilometers to then check whether the two parts of the wear indicator mark have shifted, i.e. are no longer aligned in a radial direction. It can thus be easily determined whether the vibration damper needs to be replaced.

Further advantageous designs are claimed with the subclaims and explained in more detail below.

If the two parts of the wear indication marking are implemented as graduation lines arranged radially aligned with one another, the wear indication marking can be applied in a simple manner, for example in the form of a paint or some other coating.

If the two parts of the wear indicator mark have different widths measured in the circumferential direction, tolerance-related fluctuations are taken into account and, consequently, the decision to replace the vibration damper is made easier for the maintenance personnel.

In this context, it is also useful if the second part has a greater extent in the circumferential direction than the first part.

The first part is advantageously arranged in the circumferential direction in the center of the second part. In further versions, an asymmetrical arrangement in coordination with the radial load (direction of rotation of the drive) is also conceivable.

It is also advantageous if the two parts of the wear indicator marking have the same width measured in the circumferential direction.

Preferably, the first part is located radially inside the second part.

In other words, a wear indicator is thus implemented according to the invention on a torsional vibration damper / crankshaft vibration damper (vibration damper). A suitable marking is applied during manufacture, which serves as a wear indicator and thus as direct evidence of the loss of function. A marking (e.g. in the form of a line) is applied to the hub (/ hub) and the pully (/ disc) of the torsional vibration damper exactly opposite, so that the status / function of the torsional vibration damper is immediately displayed in a simple manner, preferably visually, can be checked.

The invention will now be described below with reference to two preferred exemplary embodiments.

• 1 eine Vorderansicht eines erfindungsgemäßen Schwingungsdämpfers nach einem ersten Ausführungsbeispiel, wobei zwei an einer Nabe sowie einem Scheibenelement angebrachte Teile einer Verschleißindikationsmarkierung als radial fluchtende Striche mit gleicher Breite umgesetzt sind, sowie
• 2 eine Vorderansicht eines erfindungsgemäßen Schwingungsdämpfers nach einem zweiten Ausführungsbeispiel, wobei nun der an dem Scheibenelement vorgesehene Teil der Verschleißindikationsmarkierung breiter als der an der Nabe vorgesehene Teil umgesetzt ist.

Show it:

• 1 a front view of a vibration damper according to the invention according to a first embodiment, with two parts of a wear indicator marking attached to a hub and a disk element being implemented as radially aligned lines with the same width, and
• 2 a front view of a vibration damper according to the invention according to a second embodiment, the part of the wear indicator marking provided on the disk element now being implemented wider than the part provided on the hub.

The figures are merely of a schematic nature and are used exclusively for understanding the invention. The same elements are provided with the same reference symbols.

A vibration damper according to the invention 1 according to a first embodiment is in 1 easy to recognize with regard to its basic structure. The vibration damper used as a crankshaft vibration damper 1 is typically non-rotatably connected in its operation to a crankshaft of an internal combustion engine, not shown here for the sake of clarity. Thus the vibration damper is used 1 in the operation of the motor vehicle in a typical way to eliminate the torsional vibrations generated by the internal combustion engine. The vibration damper 1 is implemented as a so-called single TVD (/ simple damper).

The vibration damper 1 has a central one about an axis of rotation 2 (in 1 running into the image plane) mounted hub 3 on. The hub 3 is typically via a plastic connector 4th with a disc element 5 connected. The disc element 5 is in the 1 in terms of its radially outside the hub 3 running area. The disc element 5 is thus over the annular plastic connector 4th with the hub 3 connected.

The plastic connector 4th typically consists of an elastomer. The plastic connector 4th is implemented as a sleeve and radially between the hub 3 and the disc element 5 arranged. The plastic connector 4th thus forms a kind of connecting layer between the hub 3 and the disc element 5 . The plastic connector 4th is via a press fit on the hub 3 as well as the disc element 5 held. Accordingly, the plastic connector is 4th on an outer radial surface of the hub 3 pressed on and into a radial inner surface of the disk element 5 pressed in. As an alternative to this, according to further embodiments of the invention, the plastic connector is 4th on the hub 3 or the disc element 5 or both on the hub 3 as well as the disc element 5 vulcanized on, the corresponding outer surface and / or inner surface having a surface quality / pretreatment suitable for vulcanization, preferably in the form of a surface structure (such as roughness).

To determine whether the plastic material of the plastic connector 4th is subject to a certain wear during operation and exceeds a corresponding wear limit, according to the invention is a wear indicator marking 7th at the hub 3 and the disc element 5 appropriate. The wear indication mark 7th is to the in 1 shown common axial side 6 / Front side attached. The wear indication mark 7th consists of two parts 8th , 9 . In the first embodiment there is a first part 8th the wear indication mark 7th realized as the first division, whereas a second part 9 the wear indication mark 7th is realized as a second division.

The two parts 8th , 9 / Tick marks are (when new and unworn) in the radial direction of the central axis of rotation 2 viewed in alignment with one another and along a perpendicular to the axis of rotation 2 outwardly extending imaginary radial line arranged radially offset from one another. The first part 8th is at the hub 3 attached and radially inward of the on the disc element 5 attached second part 9 arranged. The two parts 8th , 9 thus overlap / overlap in a circumferential direction of the axis of rotation 2 , ie in a (tangential) direction along one about the axis of rotation 2 circular line running coaxially around.

In the first embodiment, the two parts 8th , 9 an equal extent in the circumferential direction, ie an equal width. Are the two parts 8th , 9 after a certain service life and use in a motor vehicle due to wear of the plastic connector 4th Shifted relative to one another in the circumferential direction, this gives the corresponding maintenance personnel an indication to replace the vibration damper 1 .

The in 2 illustrated vibration damper according to the invention 1 of the second exemplary embodiment is essentially similar in structure to the vibration damper 1 of the first embodiment, so that only the differences between these two embodiments are described for brevity. As in 2 you can see the one on the disk element 5 attached, second part 9 the wear indication mark 7th now larger than the one at the hub 3 intended, first part 8th . This enables a corresponding tolerance range.

The second part 9 can be designed optically different. The second part 9 is like in 2 indicated, highlighted by hatching, but other patterns can also be implemented. Also is the second part 9 Can be attached as a fully colored rectangle. The first part 8th viewed in the circumferential direction is central to the second part 9 aligned.

In further versions, the one is also on the disk element 5 attached, second part 9 the wear indication mark 7th narrower than the one at the hub 3 intended, first part 8th . As long as these fields overlap in some way in the radial direction, there is no need to replace the vibration damper 1 .

The two parts 8th , 9 are typically implemented as color markings. The two parts 8th , 9 are preferably the same color.

In other words, according to the invention, a suitable marking is already provided during manufacture 7th on the crankshaft vibration damper 1 applied, which serves as a wear indicator and thus as direct evidence of the loss of function or functional restrictions. On the hub 3 and the pulley 5 of the crankshaft vibration damper 1 is exactly opposite a mark 7th (e.g. in the form of a line). The condition / function of the crankshaft vibration damper can then be checked immediately in the workshop without any “further inconvenience” 1 be checked.

List of reference symbols

1

Vibration damper

2

Axis of rotation

3

hub

4th

Plastic connector

5

Disc element

6th

axial side

7th

Wear indication mark

8th

first part

9

second part

Claims (7)

Vibration damper (1) for a motor vehicle drive train, with a hub (3) rotatably arranged about an axis of rotation (2) and a disk element (5) connected to the hub (3) via an elastic plastic connector (4), with a wear indicator marking (7) such is attached to a common axial side (6) of the hub (3) and the disk element (5) that a first part (8) provided on the hub (3) of the wear indicator mark (7) in a radial direction of the axis of rotation (2 ) is arranged offset and overlapping in the circumferential direction with respect to a second part (9) of the wear indicator marking (7) provided on the disk element (5). Vibration damper (1) Claim 1 , characterized in that the two parts (8, 9) of the wear indicator marking (7) are implemented as graduation lines arranged radially in alignment with one another. Vibration damper (1) Claim 1 or 2 , characterized in that the two parts (8, 9) of the wear indicator marking (7) have different widths measured in the circumferential direction. Vibration damper (1) according to one of the Claims 1 to 3 , characterized in that the second part (9) has a greater extent in the circumferential direction than the first part (8). Vibration damper (1) Claim 4 , characterized in that the first part is arranged in the circumferential direction centrally to the second part. Vibration damper (1) Claim 1 or 2 , characterized in that the two parts (8, 9) of the wear indicator marking (7) have the same width measured in the circumferential direction. Vibration damper (1) according to one of the Claims 1 to 6 , characterized in that the first part (8) is located radially inside the second part (9).

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