DE102017127140A1 - Sliding tray for the bow spring arrangement of a dual-mass flywheel - Google Patents

Abstract

The invention relates to a dual mass flywheel (1), which is used in a drive train of an internal combustion engine driven vehicle, consisting of a primary part (2) and a secondary part, arranged axially spaced and connected via a bow springs (3) bow spring assembly (4) and connected to a Rotatable axis and against a restoring force of the bow springs (3) are rotatable relative to each other and the bow springs (3) in a spring chamber (5) are used, the drive side and outside of the primary part (2) and the output side of a primary to the part (2) connected lid (6) is limited, wherein the bow springs (3) via two trained as half shells, waisted sliding shells (7) are radially outwardly supported on the primary part (2), the symmetrically arranged on both sides protruding guide lugs (8, 9) of equal length include, the circumferentially offset from each other positioned laterally to stepless Fun Ktionsflächen (10, 11) of the lid (6) and the primary part (2) are guided.

Description

The invention relates to a dual-mass flywheel, which is used in a drive train of an internal combustion engine-driven vehicle, consisting of a primary part and a secondary part, which are arranged axially spaced and connected via a bow spring bow spring arrangement, and about a rotational axis and against a restoring force of the bow springs relative to each other are rotatable. The bow springs are used in a spring chamber, the drive side and the outside of the primary part and the output side is limited by a lid connected to the primary part. The bow springs are supported by two half shells running, wear protection elements forming sliding shells radially outward on the primary part.

A, also called torsional vibration damper called dual mass flywheel (DMF) is well known, which is used for damping torsional vibrations or torsional vibrations in drive trains of internal combustion engine-powered vehicles. Due to combustion processes of the reciprocating internal combustion engine, a rotational irregularity sets, which is transmitted to the drive train of the vehicle and thereby leads to loss of comfort. The dual-mass flywheel dampens the vibrations emanating from the internal combustion engine relative to the drive train and thus increases ride comfort.

From the DE 10 2009 039 997 A1 as well as the DE 10 2011 015 637 A1 are dual-mass flywheels with a primary part and a secondary part known, which are arranged relatively rotatable against the resistance of bow springs. The bow springs are supported by wear protection elements forming sliding cups on the primary part. The, partially the bow springs outside enclosing sliding cups rotationally fixed to the primary part are fixed in position.

The invention has for its object to ensure optimum lateral guidance of the sliding shells in the spring space for the bow springs by means of a simple feasible, cost-effective measure, even if the functional surfaces on the primary side as a whole, or for example in the lid are partially broken.

The solution according to the invention is characterized by the features of claim 1. Advantageous embodiments of the invention are the subject of the dependent claims.

According to the invention, the dual-mass flywheel includes waisted sliding shells, which include guide lugs arranged symmetrically on both sides and circumferentially offset from each other. The sliding shells are guided over guide lugs with equal lengths laterally to functional surfaces. In this case, the guide lugs are offset in relation to remote embossings and / or recesses in the functional surfaces of the lid and / or the primary part with play.

A significant advantage of the invention is that it ensures a desired improved, accurate lateral guidance of the sliding shells on the functional surfaces, which is partially interrupted and consequently not designed to be continuous all around. Such functional surfaces are particularly advantageous in the manufacturing process of the sliding shell, for example by means of a chipless forming process or by means of a complementary milling or turning economically produced.

Due to the waisted design weight-optimized sliding cups can be realized, which can be positioned or installed by means of a simple installation. Furthermore, by an appropriate processing or reworking of relevant components, the invention designed sliding cups can be integrated into existing ZMS concepts.

Furthermore, the invention includes a defined arrangement or position of the guide lugs of the sliding shells in the range of partial depressions, forms or embossments of the functional surface. For targeted support comprises the waisted sliding shell designed as a twin lugs guide lugs which are offset from the depressions or forms on the functional surface of the lid are supported. The twin lugs also improve the guiding function, which has a positive effect on the installation position of the sliding shells.

For safe and uniform lateral guidance is further provided that each sliding has on both sides five staggered guide lugs. Preferably, the guide lugs are at least approximately at the same distance or with the same angular distance from each other, for each of which a length of ≥ 5 mm is provided.

The substantially semi-annular shaped sliding shells are preferably made of a metallic material, for example a steel sheet. The sliding shells, which are preferably designed as a shaped sheet metal part, can be produced, for example, by means of a non-cutting shaping or deep-drawing process. As an alternative to a metallic material, the slide shells according to the invention can be produced from a wear-resistant and heat-resistant plastic or a composite material. For cost-effective production offers It is about to produce the sliding shells made of plastic by means of an injection molding process.

The structural design of the present invention designed sliding also simplifies a hardening process in the post-processing of the sliding shell. About the wider projecting lugs, especially the twin lugs, the individual sliding bowl can be advantageously absorbed and held exactly in a hardening tool. Thus, the sliding cup designed according to the invention also ensures improved handling in order to achieve optimum hardening, in particular of the contact zone, on which the bow spring is supported and guided in the installed state.

Furthermore, the inventive concept includes a cover of the primary part, which has on the side facing away from the spring chamber side, the output side of the dual mass flywheel, axially projecting lugs. These outside projections are produced in particular by a local non-cutting material deformation of the cover, in which recesses in the functional surface are adjusted. The protruding projections form a defined system for the sprocket of the dual mass flywheel and thereby enable a material saving on the lid.

• 1: einen Ausschnitt eines Zweimassenschwungrades mit einer erfindungsgemäßen Gleitschale;
• 2: einen Deckel des Zweimassenschwungrades mit einer zugehörigen Gleitschale;
• 3: in einer vergrößerten Abbildung einen Ausschnitt der Gleitschale, die über Zwillingsnasen an einer Funktionsfläche des Deckels abgestützt ist;
• 4: in einer Einzelteilzeichnung die Gleitschale in einer Perspektive.

In the following the invention will be described in more detail with reference to an embodiment shown in four figures. However, the invention is not limited to the embodiment shown in the figures. It shows:

• 1 a section of a dual-mass flywheel with a sliding shell according to the invention;
• 2 a lid of the dual-mass flywheel with an associated slip bowl;
• 3 in an enlarged illustration a section of the sliding shell, which is supported by twin lugs on a functional surface of the lid;
• 4 : in a single item drawing the slip bowl in a perspective.

The 1 shows in a partial section or in a partial view of the structure of an inventive, also called torque limiter dual-mass flywheel 1 used in a power train of a vehicle (not shown) between an internal combustion engine and a friction clutch. The dual mass flywheel 1 includes internal combustion engine side, also referred to as an input part primary part 2 and on the output side also called an output part secondary part (not shown). The primary part 2 and the abutment are over a bow springs 3 enclosing, a spring damper forming bow spring assembly 4 connected and rotatable about an axis of rotation (not shown) rotatable and limited relative to each other. The one hand on the primary part 2 and on the other hand on the secondary part supported bow springs 3 are in a spring room 5 introduced, the drive side and the outside of the primary part 2 and on the output side of a material fit to the primary part 2 attached lid 6 is limited. A relative rotation of the secondary part relative to the primary part 2 takes place counter to a spring force direction of the bow springs 3 ,

For improved wear protection of the spring elements or bow springs 3 and the primary part 2 closes the dual mass flywheel 1 Wear protection elements forming sliding shells 7 one which radially outward between the bow springs 3 and the primary part 2 are arranged. The dual mass flywheel 1 includes two separately positioned sliding cups 7 , which are preferably made of a hardened metallic material, in particular a sheet metal. Each semi-circumferential, semi-circular sliding shell 7 extends outside almost the entire length of the curved bow spring 3 , Here are the bow springs 3 in the a cup-like cross-sectional profile having, limited circumferential sliding shells 7 axially in both directions exclusively over oppositely directed guide lugs 8th . 9 held.

Due to the locally arranged guide tabs 8th . 9 can be a waisted, narrow and therefore weight-optimized sliding shell 7 be realized, in conjunction with the guide lugs 8th . 9 the profile of the bow spring 3 encloses almost 120 ° on the outside. When installed, the guide lugs 8th . 9 and thus the slip bowl 7 laterally on functional surfaces 10 . 11 of the primary part 2 and the lid 6 guided. For non-rotating mounting position of the sliding cup 7 this is in each case at the end in 2 shown attacks 12 . 13 of the lid 6 or the primary part 2 supported. In the lid 6 are on the spring room 5 pointing side partially also embossments called depressions 14 brought in. On the output side, they form, for example, by a chipless stamping or deformation of the functional surface 11 formed depressions 14 axially projecting lugs 15 , where a the dual mass flywheel 1 associated sprocket 16 is applied.

In 2 and 3 are to illustrate the invention items or a detail on an enlarged scale of the dual mass flywheel 1 shown. The semicircular slip bowl 7 is thereafter at two staggered by 180 ° attacks 12 . 13 supported at the end. The slip bowl 7 includes two closely spaced on both sides guide tabs 8th . 9 , each with twin noses 17 . 18 form.

In this case, an arrangement is provided in which a support of the twin lugs 17 . 18 offset to recessed areas of the functional area 11 , the recess 14 in the lid 6 established.

The 4 shows in a perspective the slip bowl 7 as a single item, with the guide tabs 8th a page are visible. The waisted slip bowl 7 closes five guide tabs on each side 8th one whose length L coincidentally ≥ 5 mm.

LIST OF REFERENCE NUMBERS

1

Dual Mass Flywheel

2

primary part

3

bow spring

4

Arch spring assembly

5

spring chamber

6

cover

7

sliding

8th

guide nose

9

guide nose

10

functional surface

11

functional surface

12

attack

13

attack

14

deepening

15

approach

16

sprocket

17

twin nose

18

twin nose

L

Length (guide nose)

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 102009039997 A1 [0003]
• DE 102011015637 A1 [0003]

Claims (9)

A dual-mass flywheel, which is used in a drive train of an internal combustion engine-driven vehicle, consisting of a primary part (2) and a secondary part arranged axially spaced and connected via a bow springs (3) bow spring assembly (4) and rotatable about a rotational axis and against a restoring force the bow springs (3) are rotatable relative to each other and the bow springs (3) in a spring chamber (5) are used, the drive side and the outside of the primary part (2) and the output side of a primary part (2) connected to the lid (6) limited is, wherein the bow springs (3) via two half-shells, anti-wear elements forming sliding shells (7) are radially outwardly supported on the primary part (2), characterized in that the waisted sliding shells (7) symmetrically arranged on both sides projecting guide lugs (8, 9) of equal length, the circumferentially zuei Positioned nander offset, laterally on continuous functional surfaces (10, 11) of the lid (6) and the primary part (2) are guided. Two-mass flywheel after Claim 1 , characterized in that the guide lugs (8, 9) of the sliding shell (7) offset to partial recesses (14) on the functional surface (11) of the lid (6) are guided. Dual-mass flywheel according to one of the preceding claims, characterized in that the sliding shell (7) in the region of the partial recesses (14) of the functional surface (11) as a twin lugs (18) formed guide lugs (9). Dual-mass flywheel according to one of the preceding claims, characterized in that each sliding shell (7) includes on both sides five staggered guide lugs (8, 9). Dual-mass flywheel according to one of the preceding claims, characterized in that a length (L) of ≥ 5 mm is provided for the guide lugs (8, 9) of the sliding shell (7). Dual mass flywheel according to one of the preceding claims, characterized in that the sliding shell (7) is made of a metallic material. Dual mass flywheel according to one of the preceding claims, characterized in that the sliding shell (7) is designed as a sheet-metal shaped part and is produced at least by one of the following non-cutting methods, such as punching and subsequent embossing; Separating and subsequent forming. Dual-mass flywheel according to one of the preceding claims, characterized in that during a hardening process the sliding shell (7) is received and held in a hardening tool via the twin lugs (16, 17). Dual-mass flywheel according to one of the preceding claims, characterized in that the cover (6) has on the side facing away from the spring chamber (5) in the region of the partial recesses (14) axially projecting lugs (15).

Images