Torsional vibration damper

Abstract

The invention relates to a torsional vibration damper having a damper input part (2) and a damper output part (3), which are connected to one another via a spring damper device (4) and can be rotated relative to one another, according to the invention, one or more axially projecting stop elements (15) are provided on the ring-disc-shaped section, said stop elements being formed by partial molding of the section and limiting an axial movement of the damper output part (3) relative to the damper input part (2) by stopping on the damper input part (2).

Description

Technical Field

[0001] The invention relates to a torsional vibration damper having a damper input part and a damper output part, which are connected to one another via a spring-damper arrangement and can rotate relative to one another. Background Art

[0002] Such a torsional vibration damper, as disclosed, for example, in EP 2 396 566 B1, is used, for example, in the powertrain of a motor vehicle. For example, a drive shaft, such as the crankshaft of an internal combustion engine, is connected to the damper input part, while the damper output part is connected to a driven shaft, such as the input shaft of a transmission. Vibrations and rotational irregularities occurring on the input side can be damped by means of a spring damper arrangement connected between the damper input part and the damper output part. The spring damper arrangement couples the damper input part to the damper output part so that they can rotate together. However, the damper input part and the damper output part can also be torsionally damped relative to one another by means of the spring damper arrangement, so that any vibrations or rotational irregularities on the input side are absorbed by the damper arrangement, and a nearly vibration-free or uniform rotational motion is achieved at the damper output part.

[0003] The damper input part and the damper output part are rotatable about a common axis and thus axially engaged. A spring diaphragm is sometimes positioned between the damper input part and the damper output part. The spring diaphragm is fastened to the damper output part and rests frictionally against the damper input part. The spring diaphragm closes an annular receiving area, which accommodates the spring damper arrangement and is located on the damper input part. Operating errors or during transport of the torsional vibration damper can cause the damper input part to axially deflect or tilt relative to the damper output part. This can result in undesirable axial forces acting on the spring diaphragm, which can plastically deform or even damage the spring diaphragm. Summary of the Invention

[0004] The invention is based on the problem of specifying an improved torsional vibration damper.

[0005] In order to solve the problem, according to the invention, in a torsional vibration damper of the type mentioned at the outset, one or more axially protruding stop elements are provided on an annular disk-shaped section at the damper output part, formed by local shaping of the section, and the stop elements limit the axial movement of the damper output part relative to the damper input part by abutting against the damper input part.

[0006] The torsional vibration damper according to the present invention is characterized by having one or more stop elements that protrude axially from an annular disk-shaped section of the damper output member in the form of a transition, i.e., a localized deformation, extending toward a stop surface of the damper input member. The one or more stop elements serve to limit possible axial movement of the damper output member relative to the damper input member, which could result from operating errors or possible movement during transport, by abutting against the damper input member. In other words, only limited, defined axial mobility of the damper input member relative to the damper output member is provided. This limited axial mobility thus reduces axial deflection or tilting to a level that ensures that undesirable, excessive forces, such as a spring diaphragm, do not act on other components, such as the spring diaphragm, which could damage the spring diaphragm. Since the one or more stop elements are integrally formed on the annular disk-shaped section of the damper output member, i.e., on a section that is already part of the damper output member, no additional stop mechanism is required to form or provide the stop elements. More precisely, one or more stop elements are formed directly on the annular disk-shaped section of the shock absorber output component, for which purpose the section is correspondingly shaped. Preferably, the one or more stop elements are formed by a transfer, that is, by being pressed into the section on one side using a suitable tool, so that a corresponding, axially protruding stop element is formed on the other side.

[0007] The torsional vibration damper according to the invention is therefore characterized by an integrated safety mechanism, which can limit and prevent excessive axial movement or tilting in a simple and effective manner. Furthermore, the torsional vibration damper according to the invention is also characterized by the simplicity of integrating the safety or limiting mechanism, since one or more stop elements are arranged according to the invention as a single-piece element directly on an inherently provided portion of the damper output component, namely, the annular disk-shaped section.

[0008] Preferably, a plurality of stop elements distributed equidistantly around the circumference are provided on the section. This embodiment offers the possibility of supporting or fixing the two components relative to each other at a plurality of locations around the circumference.

[0009] It is particularly preferred that the annular disc-shaped section is formed by a flange component, and the stop element is formed on the flange component by an axial transfer. The flange component, which is part of the shock absorber output part, forms a corresponding support section, on which the shock absorber spring is supported in the circumferential direction. One end of the shock absorber spring rests on the flange component, i.e., the shock absorber output part, while the other end of the shock absorber spring rests on a corresponding support section on the shock absorber input part. To this end, the shock absorber input part has a radially surrounding, channel-shaped receiving area, in which the shock absorber spring is received, and into which the flange component extends with its corresponding support section. The flange component is therefore an integral component of the shock absorber output part, which is additionally shaped or transferred accordingly to form one or more stop elements.

[0010] Preferably, the flange component has two or more radially extending support sections, on which the spring of the spring-damper arrangement is supported, with axially protruding stop elements being provided on some or all of the support sections. For example, two support sections may be provided, on which the ends of two arc-shaped damper springs, typically coil springs, are supported. In this case, two stop elements would be provided. Of course, more than two support sections may also be provided around the circumference of the flange component, and accordingly, more damper springs may also be provided, such as further stop elements at other locations as needed.

[0011] As described, one or more stop elements abut corresponding stop sections of the damper input component to limit axial movement. To this end, the damper input component preferably has an annular cover member against which the one or more stop elements abut. The cover member delimits the already described spring channel, in which the damper spring of the spring-damper arrangement is accommodated. The cover member now also serves as a stop member, meaning that an already existing component now has an additional purpose.

[0012] The stop element or elements themselves are expediently designed as pin-shaped, preferably circular, projections. As designed, the stop element is formed as a transition, i.e., it is pressed into the section or flange component on one side by means of a suitable forming tool, which results in a corresponding projection, i.e., the stop element, being formed on the other side.

[0013] The stop element itself should protrude axially by at least half the thickness of the segment or flange component. The segment or flange component is a metal component or sheet metal element with a corresponding thickness of several millimeters, so that one or more stop elements are also raised axially by a few millimeters from the surface of the segment.

[0014] As described, a spring diaphragm can be provided, which is arranged at the shock absorber output element and rests against the shock absorber input element. The spring diaphragm seals the interior of the shock absorber, and in particular the space of the spring-shock absorber arrangement, and rests directly and slidingly against the shock absorber input element, or against a slip ring provided at the shock absorber input element. As embodied, the shock absorber input element has a cover component that delimits the spring channel and preferably serves as a stop element, in which case the spring diaphragm also rests against this stop element. Thus, viewed radially, one or more stop elements extend further outward than the outer circumference of the spring diaphragm, so that the one or more stop elements can directly abut against the cover component. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be described below with reference to the accompanying drawings based on embodiments. The accompanying drawings are schematic diagrams and show:

[0016] Figure 1 A schematic diagram showing a section of a torsional vibration damper according to the invention,

[0017] Figure 2 Shows something like Figure 1 A sectional view of a shock absorber spring not shown,

[0018] Figure 3 In the first view, a perspective view of the flange component of the shock absorber output part is shown, and

[0019] Figure 4 Show Figure 3 A three-dimensional view of the other side of the flange component. DETAILED DESCRIPTION

[0020] Figure 1 The torsional vibration damper 1 according to the invention is shown, having a damper input part 2 and a damper output part 3, which are connected to one another via a spring damper arrangement 4. The torsional vibration damper 1 serves to transmit a torque introduced via an input part 5, such as the crankshaft of an internal combustion engine, to an output part 6, such as the input shaft of a transmission. Any vibrations or rotational irregularities at the input part 5 can be damped via the spring damper arrangement 4, so that a virtually vibration-free and uniform rotation is provided at the output part 6.

[0021] The damper input part 2 has an annular input flange part 7, on which an annular cover component 8 is arranged radially on the outside. The input flange part and the cover component jointly delimit a spring channel 9, in which the spring-damper arrangement 4 or its damper spring 10 is accommodated in a manner known per se. The damper output part 3 has a flange component 11, which is connected to a hub component 13 via a riveted connection 12. The hub component is in turn coupled to the output part 6 via a toothed connection. Furthermore, a spring diaphragm 14 is fastened to the damper output part 3 via a riveted connection 12 comprising a plurality of individual rivets distributed in the circumferential direction. The spring diaphragm rests in a sliding, spring-loaded manner on a slip ring 19 arranged on the cover component 8 of the damper input part 2.

[0022] The function of the torsional vibration damper 1 is to provide rotational motion to the damper input part 2 via the input part 5. The damper input part 2 is coupled to a damper spring 10 via corresponding support sections extending into the spring channel 9. The damper spring is, in turn, supported on further support sections formed on a flange component 11, which in turn is part of the damper output part 3. In other words, the damper input part 2 and the damper output part 3 are coupled to each other via the spring-damper arrangement 4 or its damper spring 10, but can rotate relative to each other within the range of the spring elasticity. Vibrations input via the damper input part 2 are thus absorbed by the damper spring 10, resulting in a nearly or completely vibration-free rotational motion being provided to the damper output part 3. The basic structure and basic function of this torsional vibration damper 1 are known.

[0023] To prevent excessive axial movement of the damper output part 3 relative to the damper input part 2, i.e., axial deflection or tilting, caused by possible operating errors or movements during transport or during installation, corresponding securing means are provided that limit the axial mobility of the damper input part 2 relative to the damper output part 3. For this purpose, a plurality of stop elements 15 are preferably provided on the damper output part 3. These stop elements 15 axially limit the movement of the damper output part 3 relative to the damper input part 2, so that any axial deflection or tilting is only possible in a defined and restricted manner. Excessive axial deflection or tilting can, for example, negatively affect the spring diaphragm 14, which can be deformed or even damaged.

[0024] In order to realize the fixing mechanism including the stop element 15, the stop element 15 is formed in one piece, that is, integrally, at the flange component 11, such as Figure 1 , but there are Figure 2The stop element is designed as an axial transition, that is, a corresponding press-in 16 is provided on the side of the flange component 11 that is directed toward the damper input part 2, which is introduced by means of a forming tool, and which in turn leads to an axial projection on the opposite side of the flange component 11, namely the stop element 15, which protrudes axially toward the cover component 8, as shown. Figure 1 and Figure 2 This is shown intuitively. The stop element 15 ends shortly before the cover member 8, so that only a small distance is provided between the stop element 15 and the cover member 8, which ultimately defines the maximum axial mobility. Therefore, if the stop element 15 is moved against the cover member 8, the axial movement is limited, specifically to such an extent that, for example, the spring diaphragm 14 is not damaged.

[0025] Figure 3 and Figure 4 Two perspective views of the flange component 11 are shown from respective sides. Figure 4 The side with the corresponding press-in portion 16 is shown, and Figure 3 The side pointing to the cover component 8 is shown, at which a corresponding pin-shaped and circular stop element 15 protrudes axially. The press-in portion 16 is introduced by means of a corresponding tool, which is designed so that the stop element 15 is formed in the desired geometry at the other side.

[0026] The depth of the press-in portion 16 is dimensioned such that the resulting stop element 15 projects axially, preferably laterally, by at least half the thickness of the section, here of the flange component 11 .

[0027] Figure 3 and Figure 4 In a more detailed illustration, a flange component 11 is shown, which is connected to a hub component 13 in the installed position via a riveted connection 12. As described, the damper spring 10 is supported on the flange component 11. To this end, the flange component 11 has two radially extending support sections 17 in the example shown, on which corresponding stop sections 18 are formed on both sides, against which the damper spring 10, usually a helical spring, is supported in the circumferential direction. In the example shown, two stop elements 15 are formed at the two support sections 17. It is conceivable that, instead of only two such support sections 17, a plurality of support sections 17 can also be provided, which are then distributed equidistantly around the circumference and, if necessary, are connected to a corresponding number of stop elements 17.

[0028] Therefore, the stop element 17 is formed as an integral part of the flange component 11, which is already a mandatory functional component of the torsional vibration damper 1. In other words, the already existing component is additionally used to integrate the axial securing mechanism. This is because the stop element 15 is formed by the simple shaping of the flange component 11. The cover component 8, which is already present and serves to complete the annular spring channel 9, is also used within the scope of the axial securing mechanism. That is, after the stop element can abut against the cover component to limit axial movement, the cover component also performs the additional function of serving as a stop surface. Thus, the present invention integrates the axial movement limiting mechanism without having to integrate a separate, additional component for this purpose.

[0029] Reference Signs List

[0030] 1 Torsional vibration damper

[0031] 2 Shock absorber input component

[0032] 3 Shock absorber output components

[0033] 4 Spring damper device

[0034] 5 Input components

[0035] 6 Output components

[0036] 7 Input flange parts

[0037] 8 Cover member

[0038] 9 Spring channel

[0039] 10 Shock absorber spring

[0040] 11 Flange components

[0041] 12 Riveting connection device

[0042] 13 hub component

[0043] 14 Spring diaphragm

[0044] 15 Stop element

[0045] 16 Press-fit portion

[0046] 17 Support section

[0047] 18 Stop section

[0048] 19 slip ring.

Claims

1. A torsional vibration damper comprising a damper input part (2) and a damper output part (3), the damper input part and the damper output part being connected to each other via a spring damper arrangement (4) and being capable of rotation relative to each other, characterized in that One or more axially protruding stop elements (15) formed by local shaping of the segment are provided on the annular disc section of the damper output component (3), and the stop elements limit the axial movement of the damper output component (3) relative to the damper input component (2) by stopping at the damper input component (2).

2. The torsional vibration damper according to claim 1, characterized in that A plurality of stop elements (15) are provided on the section and are distributed equidistantly around the circumference.

3. The torsional vibration damper according to claim 1 or 2, characterized in that: The annular disk-shaped section is formed by a flange component (11), on which the stop element (15) is formed by an axial transition.

4. The torsional vibration damper according to claim 3, characterized in that The flange component (11) has two or more radially extending support sections (17), on which the spring (10) of the spring-damper device (4) is supported, wherein axially protruding stop elements (15) are provided on some or all of the support sections (17).

5. The torsional vibration damper according to any one of the preceding claims, characterized in that The damper input part (2) has a cover component (8) in the form of an annular disk, against which one or more stop elements (15) abut.

6. The torsional vibration damper according to any one of the preceding claims, characterized in that The stop element (15) is designed as a pin-shaped, preferably circular, projection in cross section.

7. The torsional vibration damper according to any one of the preceding claims, characterized in that The stop element (15) protrudes axially by at least half the thickness of the segment.

8. The torsional vibration damper according to any one of the preceding claims, characterized in that A spring diaphragm (14) is provided, which is arranged at the shock absorber output component (3) and is supported against the shock absorber input component (2).

Images