DE102006017548B3 - Torsional vibration damper e.g. rotary mass damper, for crankshaft of motor vehicle engine, has tooth contour introduced in hub and/or pulley and fixing damping ring in axial direction, and asymmetrical groove designed in saw-tooth shape - Google Patents

Abstract

The damper has a damping ring (12) made of an elastomer material, which is enclosed between a hub (11) and a pulley (10). A tooth contour (14) is introduced in the hub and/or the pulley and fixes the damping ring in an axial direction. The contour has asymmetrical grooves, where one of the asymmetrical grooves is designed in a saw-tooth shape and another asymmetrical groove is designed in a nose shape. The pulley and/or the hub includes an end stop extended in a radial direction. The tooth contour is extended in a circumferential direction of the hub and/or the pulley.

Description

The The invention relates to a torsional vibration damper, with a hub and a Pulley and a damping ring made of an elastomeric material between the hub and pulley is injected, being in the hub and / or the pulley a contour is incorporated, which defines the damping ring in the axial direction.

Become torsional vibration damper Also called rotary Tilger. They are preferably used on crankshafts of motor vehicle engines. By the time uneven torque development in the engine and the Drehheonanz the crankshaft vibrations. These Vibrations are reduced by the torsional vibration damper before the Torque over one on the belt support surface adjacent belt to other units such as a Generator is passed.

Around to prevent that between the hub and the pulley injected elastomeric spring body while the operation emanates from the space between hub and pulley, Various methods are known from the prior art.

From the DE 197 49 421 C2 is a torsional vibration damper and a method for its production is known in which between the hub and pulley connecting these rubber body is injected. In order to enable a fixation of the injected rubber body, a bell-shaped fastening contour is formed both on the hub and on the pulley. However, it has been shown that there is no sufficient axial fixation of the rubber body without additional measures.

The DE 44 04 255 C2 discloses a method of manufacturing a torsional vibration damper in which the hub and pulley contact surfaces are coated with an adhesive. When injecting the elastomer body of the adhesive is activated and then cured either at up to 90 ° C within a few minutes or at room temperature within 24 hours. The hub and the pulley of the torsional vibration damper are made fat-free before processing by chemical use, which makes the production more difficult.

Next is in the DE 196 53 856 C2 a method is described in which the injected rubber compound is cured for up to 24 hours at up to 170 ° C. This production step is called tempering. Again, a degreasing of the components is necessary.

The DE 195 25 305 C2 discloses a torsional vibration damper with a hub and at least two flywheels. The flywheel rings are each connected to the hub by at least one separately produced spring element made of rubber and can be rotated relative to one another and to the hub. The rotatability of at least one of the flywheels is limited by at least one stop of the flywheel and a counter-stop to a certain angular extent. The spring elements are arranged unbound between the hub and the flywheels. An installation space of the first spring element is formed in the axial direction bell-shaped, whereby axial displacements of the flywheel ring can be avoided.

The EP 1 307 669 B1 shows a torsional vibration damper with a hub and an outer ring and a pressed therebetween elastomeric body. The voltage applied to the elastomeric body peripheral surfaces of the hub and the outer ring have circumferential in the circumferential direction and extending in the axial direction waves.

From the GB 1,203,999 is to take a torsional vibration damper, whose hub is constructed in two parts. Furthermore, the elastomeric spring facing surface of the pulley has a wedge-shaped cross-section. To mount the torsional vibration damper, the elastomer spring is enclosed by both hub parts and then the hub parts are joined together by welding or riveting.

task The invention is therefore the fixation of the injected damping ring To ensure and the creation of a torsional vibration damper simplify and thus cheaper to design.

to solution this object is proposed in a torsional vibration damper of the above type, that the contour incorporated in the pulley and / or the hub a tooth contour is the at least one asymmetric notch having.

This tooth contour defines the damping ring in the axial direction, so that it can not emigrate from the torsional vibration damper, even under heavy load. A torsional vibration damper, in which the tight fit of the damping ring is ensured by a toothing contour according to the invention, can be produced without the use of adhesives or adhesives. This shortens the production time. Time-consuming and material-intensive work steps such as tempering and vulcanization can be dispensed with. At the same time, the means of production are kept free of adhesive or adhesive marks, so that the time required for acidification is reduced. Likewise, by eliminating the grease removers previously used to prepare for injection, compliance with environmental regulations and occupational safety is simplified. Through these advantages, a torsional vibration damper according to the invention can be produced in a simple manner and at low cost.

advantageous Embodiments are the subject of the dependent claims.

In Another advantageous embodiment is the notch in cross section sawtooth or nose-shaped executed. If several indentations are used, it is also conceivable to use different shapes to use, for example, to facilitate the Einschiessen or for adaptation on material properties of the items.

Advantageous may be provided on the pulley and / or the hub an end stop, the damper ring in addition in an axial direction protects against emigration end.

to further support of the interference fit, the pulley and / or the hub in another advantageous embodiment, a concave or convex fastening contour on which the tight fit of the damping ring additionally improved.

Around the tight fit of the damping ring in the circumferential direction, is in a further advantageous Design an anti-rotation provided for the damping ring. Especially can the rotation by a extending in the axial direction Notch formed in the pulley and / or the Hub is introduced.

In a first embodiment of the invention, the toothing contour is incorporated in the metal of the pulley. This has the advantage that no additional production step is needed. For example, if the pulley, as in the DE 44 08 427 C2 is rolled, only the toothing contour must be included in the rolled profile.

In a second embodiment of the invention, a plastic coating is applied to the metal of the pulley. This is basically in the DE 10 2004 022 050 A1 described in the same applicant. In this plastic coating, the tooth contour is incorporated. The main advantage of this embodiment is to ensure the corrosion resistance of the affected metal surface, without having to apply special corrosion coatings. Furthermore, a post-processing on a plastic surface is unnecessary.

following the invention will be explained in more detail by means of embodiments which are shown schematically in the drawings. Show it:

1 a vertical section through a torsional vibration damper according to the invention;

2 the detail X out 1 with tooth contour 14 ;

3 the detail X out 1 with tooth contour 14 and end stop 13 ;

4 the detail X out 1 with tooth contour 14 and double-sided end stop 13 ;

5a the detail Y off 2 with a sawtooth-shaped toothing contour 14a ;

5b the detail Z out 2 with a nose-shaped tooth contour 14b ;

6a the detail as in 5a , wherein the tooth contour 14a in a plastic coating 15 is formed;

6b the detail as in 5b , wherein the tooth contour 14b in a plastic coating 15 is formed;

7 a side view of the pulley 10 a torsional vibration damper 9 and

8th the detail W off 7 , in which an axial rotation is shown.

The in 1 illustrated torsional vibration damper 9 consists of a pulley 10 , a damping ring 12 and a hub 11 , which are each rotationally symmetric. The pulley 10 and the hub 11 Made of metal, while the damping ring 12 made of an elastomeric material.

The hub 11 includes mounting holes 21 for fastening the hub 11 on the crankshaft of an engine.

The pulley 10 has on its outer peripheral surface a poly-V profile 20 which is made by turning. However, it is also conceivable to obtain a corresponding profile by rolling the corresponding profile.

The poly V profile 20 picks up a belt to drive vehicle aggregates.

For the production of the torsional vibration damper 9 be the pulley 10 and the hub 11 arranged concentrically to each other and the damping ring 12 interposed.

In operation of the torsional vibration damper 9 act on the damping ring 12 in particular forces in the circumferential direction and in the axial direction. Gives the damping ring 12 position changing according to these forces, so the torsional vibration damper 9 unusable. So if the damper ring 12 not on pulley anymore 10 and hub 11 adheres, it may, for example, in the axial direction of the space between the hub 11 and pulley 10 emigrate. A failure of the damping ring 12 During operation, damage to the engine compartment may result. This is to be avoided in any case.

The tight fit of the damping ring 12 is inventively by in 2 shown toothing contour 14 ensured. The tooth contour 14 includes at least one notch on the inner surface of the pulley 10 runs in the circumferential direction. This notch preferably has an asymmetrical cross section around the damping ring 12 to allow it to move past it when shooting in one direction, but to prevent it from moving in the opposite direction.

A preferred notch cross section is in 5a shown. The notch 14a is formed like a sawtooth and leaves a movement of the damping ring 12 only in an axial direction while pushing the damping ring 12 with a movement in the opposite direction undercuts and thereby blocks the way.

Another preferred notch cross section is in 5b shown. The notch 14b is nose-shaped. Their effect corresponds to that of the notch 14a , According to the material properties of the damping ring 12 are also other cross sections than those mentioned here conceivable.

In order to simplify the machining of the surface, in another method for producing a pulley 10 also a flywheel with a plastic encapsulated. In this plastic layer then the poly-V profile 20 and the inner surface incorporated, so that correspondingly a pulley 10 results. The 6a and 6b show according to a formation of the notches 14a and 14b in an applied plastic layer.

To the tight fit of the damping ring 12 to ensure in the axial direction, according to the invention to the toothing contour 14 an end stop 13 , as in 3 shown, consulted. This end stop 13 becomes axially in the sliding direction of the toothing contour 14 end preferably on the pulley 11 arranged. As a result, one obtains an arrangement in which the damping ring 12 can be injected, but in which he is reliably fixed in the axial direction.

Depending on the characteristics of the in the damping ring 12 used material can be the end stop 13 also, as in 4 shown on the hub 11 and the pulley be formed.

Even if the damping ring 12 does not emigrate, but starts to slide in the circumferential direction, the torsional vibration damper loses 5 its effect. Because the pulley 10 usually an OT mark is introduced for engine control, this would lead to a malfunction of the engine electronics.

7 shows a pulley 10 with an anti-twist device according to the invention 16 , The tight fit of the damping ring 12 in the circumferential direction is inserted through a pulley 10 in the form of axial notches 17 incorporated anti-twist device 16 ensured, which are arranged offset in the circumferential direction. A single notch 17 as detail W off 7 is in 8th shown.

The damping ring 12 bulges after shooting in the notches 17 in and is prevented by these on a movement in the circumferential direction.

The inventive toothing contour of the damping ring 12 securely set. Adhesives and adhesives for fixing the damping ring can be dispensed with.

9

torsional vibration dampers

10

pulley

11

hub

12

damping ring

13

end stop

14

tooth contour

14a

Sawtooth notch

14b

Nose-shaped notch

15

Plastic coating

16

twist

17

notch

20

Poly-V-profile

21

mounting holes

Claims (10)

Torsional vibration damper with a hub ( 11 ), a pulley ( 10 ) and a damping ring ( 12 ) made of an elastomeric material between Hub ( 11 ) and pulley ( 10 ), whereby in the hub ( 11 ) and / or the pulley ( 10 ) a contour ( 14 ) is incorporated, which the damping ring ( 12 ) in the axial direction, characterized in that the contour as a tooth contour ( 14 ) is formed, the at least one asymmetric notch ( 14a . 14b ) having. Torsional vibration damper according to claim 1, characterized in that the notch ( 14a ) is executed like a sawtooth. Torsional vibration damper according to claim 1; characterized in that the notch ( 14b ) is nose-shaped. Torsional vibration damper according to one of the preceding claims, characterized in that the pulley ( 10 ) and / or the hub ( 11 ) has a radially extending end stop ( 13 ) having. Torsional vibration damper according to one of claims 1 to 4, characterized in that the pulley ( 10 ) and / or the hub ( 11 ) has a concave or convex fastening contour. Torsional vibration damper according to one of claims 1 to 5, characterized in that the toothed contour ( 14 ) in the circumferential direction of the hub ( 11 ) and / or the pulley ( 10 ). Torsional vibration damper according to one of claims 1 to 6, characterized in that for the damping ring ( 12 ) an anti-twist device ( 16 ) is provided. Torsional vibration damper according to claim 7, characterized in that the rotation ( 16 ) is an axially extending notch, which the damping ring ( 12 ) secures against rotation in the circumferential direction. Torsional vibration damper according to one of claims 1 to 8, characterized in that the toothed contour ( 14 ) and / or the anti-twist device ( 16 ) in the metal of the pulley ( 10 ) or the hub ( 11 ) is incorporated. Torsional vibration damper according to one of claims 1 to 9, characterized in that the toothed contour ( 14 ) and / or the anti-twist device ( 16 ) in a plastic coating ( 15 ) formed on the metal of the pulley ( 10 ) or the hub ( 11 ) is applied.