DE102006050132B3 - Static redundant bearing for power supply unit of motor vehicle, has drive assembly supported on vehicle chassis over five assembly bearings, which are assigned to assembly bracket fixed on drive assembly - Google Patents

Abstract

The bearing has the drive assembly supported on a vehicle chassis over five assembly bearings (12), which causes the static redundancy of the bearing, and are assigned to an assembly bracket (14) fixed on the drive assembly. The brackets, each having a through hole (18), allows a screw (16) to pass, over which a force-locked joint is made between assembly bearings and assigned assembly bracket. A sleeve has fastening unit, over which the sleeve is detachably connected, its axial position fixed, with the through hole of each assembly bracket.

Description

The The invention relates to a statically overdetermined storage of a Drive unit of a motor vehicle according to the preamble of claim 1 specified type.

generally known be over the storage of the drive unit the engine forces, here especially the weight and the dynamic forces of the engine, intercepted. As a rule, the drive unit of the motor vehicle is by means of this a so-called statically determined three-point storage stored. This is the gearbox flanged directly behind the engine mainly in the area of the tunnel with its own traverse directly on the body supported while the engine over two bearings is supported on a subframe. Through this three-point storage the system is statically determined, i. H. each bearing becomes according to the bearing characteristic and the center of gravity of the unit a corresponding altitude taking. Such, statically determined three-point storage becomes current z. B. installed in the current model of RUDI A 4.

One Problem of statically determined aggregate storage described exists in that for that Engine due to the few bearings only low attenuation achievable is what leads to vibration-enhancing comfort (stucco).

Around this has been avoided, especially in the area of premium vehicles, a statically overdetermined Storage of the drive unit enforced. That is, in such Premium vehicles not only the drive unit at three points, but now at five Supported points is to better cushioning to achieve. An over-determined, five bearing points having aggregate storage is for example in the current Audi A 8 installed. Since it is due to the now five bearing points a statically overdetermined System acts and also tolerances from a more complex tolerance chain to be added, will be in a statically overdetermined aggregate storage unlike statically determined storage usually never the corresponding altitude and therefore the right level for the required Preload for give the aggregate bearings.

The resulting after putting the drive unit on the unit bearing altitude is in 1 and 2 exemplified at a bearing point on the basis of the two conceivable extreme cases "oversize" and "game": 1 and 2 each show a gear bearing, which are connected in a known manner via a screw connection with a gear support of a non-illustrated drive unit of the motor vehicle. While in 1 the bearing point gearbox bearing / gearbox support for the extreme case "oversize" is shown, shows 2 the bearing point for the extreme case "game". In the first case, in this case, the biasing force is too large, while in the second case due to the game, the gear support does not reach the bearing core of the gearbox bearing and thus no biasing force is present.

The Consequence of this is that, in order to adjust the bearing preload to enable the Bearing aggregate bearing / drive unit support even with unfavorable Tolerances should be interpreted as that between the unit bearing and drive unit support always Game is available. In the existing gap must then after investigation the gap dimension a corresponding spacer will be placed, which ultimately the necessary Bias generated.

• – ein erstes Aufsetzen des Antriebsaggregats auf die fünf Aggregatlager;
• – Ermittlung des Spaltmaßes für die einzulegenden Distanzscheiben;
• – Anheben des Antriebsaggregats und Einlegen der Distanzscheiben, ein Anheben ist hierbei zwingend erforderlich, da, um eine Lagervorspannung zu erzielen, die Distanzscheiben in jedem Fall dicker als das Spaltmaß sein müssen und daher nicht radial einschiebbar sind;
• – ein Zweites Aufsetzen des Antriebsaggregat auf die fünf Aggregatlager;
• – Verschraubung der Lagerstellen.

The assembly process of a drive unit mounted via a statically overdetermined bearing therefore looks like this:

• - A first putting the drive unit on the five engine mounts;
• - Determination of the gap dimension for the shims to be inserted;
• - Lifting the drive unit and inserting the spacers, a lifting is hereby absolutely necessary because, in order to achieve a bearing preload, the spacers in each case must be thicker than the gap and therefore are not radially inserted;
• - a second putting the drive unit on the five engine mounts;
• - Screwing the bearings.

Of the described assembly process proves due to the required twice lifting the drive unit as cumbersome and time consuming.

From the DE 691 12 586 T2 discloses a system for securing a carrier to two parts of a mechanism, in particular the cylinder block and the cylinder head of an internal combustion engine. The system includes at least first and second points for attachment of the carrier to first and second separate parts of a mechanism, respectively, wherein each attachment point comprises a pin housed in a through-bore in the carrier with play and into the corresponding one Part of the mechanism can be screwed. The system is characterized in that the first attachment point further includes a bush divided into two parts by means of an oblique section made in a plane which forms an angle different from a right angle with the symmetry axis of the bushing, wherein the bushing is slidably inserted into the diarrhea bore and receives the bolt therein and a first end which has a shoulder is provided, which can receive a abutting head of the bolt, and has a second end, which is opposite to the first and abuts the part of the mechanism. In use, the parts are fastened by the bolt between the first part of the mechanism and the head of the bolt in such a way that they deform elastically and fix an axial locking of the first bush in the second bushing.

Of the Invention is based on the object, a statically overdetermined Storage of a drive unit of a motor vehicle according to the preamble of claim 1 specified type while avoiding the said Disadvantages continue to form such that a simplified assembly of the drive unit allows is.

These The object is achieved by the characterizing features of claim 1 solved in conjunction with its generic features.

The under claims form advantageous developments of the invention.

Of the The invention is based on the finding that a simplified Setting the bearing preload the assembly process of the drive unit considerably simplified.

For this purpose points the motor vehicle is a statically overdetermined Storage of the drive unit, in which the drive unit via at least five engine mounts is mounted on a vehicle body of the motor vehicle. The the static over-determination The bearing bearings causing accumulation are each one Assigned to the drive unit specified aggregate support. The aggregate supports point in each case one of a screw durchdurch through passage opening, over the a non-positive Connection between unit warehouse and the respectively assigned one Physical support of the drive unit is made. According to the invention is in the passage opening the aggregate supports one sleeve each introduced, which is axially movable with respect to the passage opening and on the axial position in the respective passage opening by means of a unit bearing facing and engageable with the unit bearing in operative connection face a Lagerervor voltage is adjustable, wherein the sleeve has fastening means over which the sleeve, fixing their axial position, undetachable with the respective passage opening of the Physical support is connectable.

On a simple way is now a statically overdetermined one Storage of a drive unit of a motor vehicle provided, at the after putting the drive unit on the bearing points by an appropriate adjustment of the axial position of the sleeves the required bias of the unit bearing is adjustable. One costly lifting the drive unit is not now more required. Another advantage is that after Production of insoluble Connection between sleeve and aggregate support a unique piece is created, which can only be assigned to one storage location is, this is a swapping of any spacers in customer service not possible is. In addition, through the sleeve is a individual and sensitive Adjustment of the Bearing preload available posed, which is reflected directly positive in the vehicle acoustics.

Preferably has the passage opening the respective aggregate supports an internal thread and the sleeve a correspondingly designed external thread on. This has the Effect that the axial positioning of the sleeve se to adjust the required Bearing preload by means of a screwing very targeted feasible. In addition, when screwing by means of a known type and simultaneously performing torque measurement set an exact bias of the corre sponding unit bearing become.

Around a simple axial positioning of the sleeve in the corresponding passage opening of the unit support means to allow a screwing movement has the sleeve preferably a hexagon socket. The formation of the inner surface of Sleeve as Hexagon socket has the further advantage that thereby an optimal Force distribution between sleeve and a corresponding trained trained tool is, so a correspondingly high torque transmission for the axial movement of the sleeve and thus provided for adjusting the bearing preload.

According to one embodiment The invention is the sleeve as a steel sleeve educated. The use of a steel sleeve proves to be advantageous as these are inexpensive is guaranteed and a long life.

According to one particularly advantageous embodiment According to the invention, the fastening means of the sleeve are on the end region facing away from the end face the sleeve arranged and comprise a plurality of flap-shaped segments, the with the passage opening the aggregate support positive and / or cohesive are connectable. The positive and / or cohesive connection between the fastening element and passage opening can by means of embossing or flipping or spreading of the flap-shaped segments respectively. This can be done both by hand and with an automatic Device performed become.

Further Advantages, features and applications of the invention result from the following description in connection with in the drawing illustrated embodiment.

The Invention will be described below with reference to the drawing embodiment described in more detail.

In the description, in the claims, in the abstract and in the drawing are the ones listed below the reference numerals used terms and associated reference numerals used. In the drawing mean:

1 A sectional view of a transmission bearing a statically overdetermined unit storage according to the prior art for the first extreme case "oversize";

2 the gearbox bearing 1 for the second extreme case "game";

3 a schematic sectional view of an inventively designed bearing point of a statically overdetermined aggregate storage, wherein the left half of the sleeve represents the state before the stamping and the right half of the tube state after stamping;

4 an enlarged view of the detail X from 3 .

5 a schematic perspective view of the sleeve for adjusting the bearing preload, and

6 a plan view of the sleeve 5 ,

1 and 2 each show in a sectional view a bearing point of a statically overruled aggregate bearing 10 According to the state of the art.

For clarity, is from the unit storage 10 only one designed as a gearbox bearing unit 12 represented, via an appropriately assigned unit support 14 , here in the form of a gear support, a drive unit, not shown, is supported. The aggregate support 14 indicates one of a screw 16 enclosed passage opening 18 on, over the aggregate support 14 and thus the drive unit are positively connected with each other.

At the in 1 The case shown is due to the "oversize" between unit bearings 12 and aggregate support 14 the bearing preload force too large, which could possibly lead to destruction of the corresponding bearing point. On the other hand, in the case of 2 illustrated case due to the clearance between the unit bearing 12 and aggregate support 14 no preload force available, ie to adjust the required preload force corresponding spacers must be in the gap between the unit bearing 12 and aggregate support 14 be introduced, which, as already stated, requires a renewed lifting of the entire drive unit.

In the 3 illustrated inventive trained storage of a statically overdetermined aggregate storage 10 avoids the above-mentioned disadvantage of the prior art. Below are the corresponding components with the same reference numerals 5 characterized.

In the present case is the aggregate bearing 12 only the bearing core represented, in which the screw 16 is screwed. In the passage opening 18 support the unit 14 is a sleeve 20 introduced, with respect to the passage opening 18 the aggregate support 14 is axially movable. For this purpose, the passage opening 18 the aggregate support 14 an internal thread and the sleeve 20 a corresponding thereto designed external thread, so that by a corresponding screwing movement of the sleeve 20 in the passage opening 18 the aggregate support 14 an axial positioning of the sleeve 20 is possible.

For easy positioning of the sleeve 20 in the passage opening 18 the aggregate support 14 to allow, and to achieve a positive fit for the setting tool A is the inner surface of the sleeve 20 designed as a hexagon socket.

By a corresponding axial positioning of the sleeve 20 in the passage opening 18 the aggregate support 14 is the sleeve 20 over her face 22 with the bearing core of the unit bearing 12 be brought into operative connection, ie by taking a corresponding axial position of the sleeve 20 the preload force is now adjustable.

At her the face 22 remote end region has the sleeve 20 several flap-shaped segments 24 on, over which the sleeve 20 , fixing its axial position, undetachable with the passage opening 18 the aggregate support 14 is connectable. The permanent connection between sleeve 20 on the one hand and passage opening 18 on the other hand takes place here by a thorn of the flap-shaped segments 24 , In this case, a plastic material deformation takes place both on the flap-shaped segments 24 as well as in the passage opening 18 instead of. The sleeve 20 can thus no longer twisted or in relation to the passage opening 18 be moved axially, whereby the setting is maintained permanently; shell 20 and aggregate support 14 become practically a part of it.

3 shows an example of the state of the sleeve 20 before making the permanent bond and after making the permanent bond: while the left part of the sleeve 20 the sleeve 20 and in particular the flap-shaped segments 24 before thorn shows, is in the right part of the sleeve 20 with the ragged flap-shaped segments 24 shown.

As in particular from 4 is apparent, is only considered in the axial direction a lower portion of the passage opening 18 the aggregate support 14 provided with an internal thread, while the upper region, ie the flap-shaped segments 24 the sleeve 20 assigned area as free routing 26 is trained. As a result, after the thorns an optimal form and / or material connection between the flap-shaped segments 24 the sleeve 20 and the through hole 18 the aggregate support 14 ensured.

A detail view of the sleeve 20 with their flap-shaped segments 24 is in again 5 shown while from the in 6 illustrated plan view of the sleeve 20 the formation of the inner surface of the sleeve 20 is clearly visible as a hexagon socket.

• – Aufsetzen des Antriebsaggregats auf die Aggregatlager 12. Hierbei befinden sich die Hülsen 20 bereits in den Durchgangsöffnungen 18 der entsprechenden Aggregatstützen 14. Die Hülsen 20 sind dabei so angeordnet, dass ihre Stirnflächen 22 bündig zur Unterkante der jeweiligen Aggregatstütze 14 ausgerichtet sind.
• – Einführen eines entsprechenden Schraubwerkzeuges mit integriertem Drehmomentensensor in das Innensechskant der Hülse 20 und Einstellung der erforderlichen Lagervorspannung.
• – Herstellung der unlösbaren Verbindung durch Aufdornen der lappenförmig ausgebildeten Segmente 24 der Hülse 20
• – Verschraubung der Lagerstellen.

As a result of the embodiment according to the invention, the assembly process of a drive unit mounted via a statically overdetermined mounting is considerably facilitated and comprises the following steps:

• - Place the drive unit on the unit bearings 12 , Here are the sleeves 20 already in the through holes 18 the corresponding aggregate supports 14 , The pods 20 are arranged so that their faces 22 flush with the lower edge of the respective unit support 14 are aligned.
• - Inserting a corresponding screwing tool with integrated torque sensor in the hexagon socket of the sleeve 20 and setting the required bearing preload.
• - Preparation of the permanent connection by thorns of the flap-shaped segments 24 the sleeve 20
• - Screwing the bearings.

One cumbersome Lifting and reassembly of the drive unit to the unit bearing is therefore no longer necessary.

10

Physical storage

12

engine mounts

14

Physical support

16

screw

18

Through opening

20

shell

22

face

24

Attachment / flap-shaped segments

26

Free-cutting

a

axial direction

Claims (5)

Static overdetermined storage ( 10 ) of a drive unit of a motor vehicle, in which the drive unit via at least five engine mounts ( 12 ) is mounted on a vehicle body of the motor vehicle, wherein the static over-determination of the bearing causing aggregate bearing ( 12 ) each one of the drive unit fixed aggregate support ( 14 ), and the aggregate supports ( 14 ) one each from a screw ( 16 ) through-passage ( 18 ), via which a frictional connection between aggregate bearings ( 12 ) and the respective associated unit support ( 14 ) is made of the drive unit, wherein in the passage opening ( 18 ) of the aggregate supports ( 14 ) one sleeve each ( 20 ), which in relation to the passage opening ( 18 ) is axially movable and about the axial position in the respective passage opening ( 18 ) by means of an aggregate bearing ( 12 ) and with the aggregate bearing ( 12 ) operatively engageable face ( 22 ) a bearing preload is adjustable, characterized in that the sleeve ( 20 ) Fastening means ( 24 ), over which the sleeve ( 20 ), fixing its axial position, indissoluble with the passage opening ( 18 ) of the respective unit support ( 14 ) is connectable. Aggregate storage ( 10 ) according to claim 1, characterized in that the passage opening ( 18 ) of the respective aggregate supports an internal thread and the sleeve ( 20 ) has a correspondingly formed external thread. Aggregate storage ( 10 ) according to claim 2, characterized in that the sleeve ( 20 ) has a hexagon socket. Aggregate storage ( 10 ) according to claims 1 to 3, characterized in that the sleeve ( 20 ) is formed as a steel sleeve. Aggregate storage ( 10 ) according to one of the preceding claims, characterized in that the fastening means of the sleeve ( 20 ) at the Face ( 22 ) facing away from the end portion of the sleeve ( 20 ) are arranged, and a plurality of flap-shaped segments ( 24 ), which with the passage opening ( 18 ) of the respective unit support ( 14 ) are positively and / or cohesively connectable.