DE102004006577A1 - Belt drive for auxiliary unit for motor vehicle engine, includes adjustable position part for assisting belt installation - Google Patents

Abstract

At least one part of the auxiliary unit drive (6) in working contact with the belt (4) has a variable position. The adjustable position part is an auxiliary unit, preferably an alternator (14), or a belt guide roll (12).

Description

Field of the invention

The The invention relates to a belt drive for the accessory drive a Internal combustion engine of a motor vehicle, in which a Elastriemen the internal combustion engine and drivable ancillaries drive effective connects with each other.

background the invention

It are diverse Belt drives are known in which the tensioning of the belt over its lifetime is accomplished by means of separate clamping devices. Such Clamping devices are consistently expensive constructions and consequently expensive to produce, require separate cultivation and may need being repaired.

At least with simply executed Riementrieben was therefore already dispensed with these fixtures and a so-called Elastriemen used which a limited Has elasticity. Here, the problem may occur that the belt during assembly relatively strong to be stretched, to hang up easily of the belt to ensure the belt pulleys of the belt drive. Often the belt is overstretched, which to a previous damage lead the still new belt can. About that In addition, such an assembly procedure is cumbersome, time consuming and requires special tools.

One typical example of a comparatively complex Assembly procedure is known from Volkswagen, type "beetle", where the V-belt wraps around a pulley on the driving crankshaft and another Pulley on the alternator. For mounting the V-belt It is planned, one half the divided pulley of the alternator, so that The belt can be laid tension-free. Then must after inserting one of the prescribed belt tension corresponding number of spacers the pulley half again to be assembled.

A device for pre-stretching of drive belt is from the DE 38 21 369 C2 known. In this case, the belt to be mounted is first taken up in a separate tensioning device and loaded dynamically, which sets a pre-stretch. Subsequently, the belt is mounted in the still warm state in the belt drive of the motor vehicle. The disadvantage is the overall high effort by the separate stretching device.

Task of invention

In front The invention is therefore based on the object to design a tensioner-free belt drive such that a easy assembly of a Elastriemens is guaranteed and an increase in lifespan for this entry.

Summary the invention

The Invention is based on a belt drive for the auxiliary drive a Internal combustion engine of a motor vehicle, in which a Elastriemen the internal combustion engine and the drivable ancillary drives connects with each other. To the solution the task is also provided that at least one from the Elastriemen acted upon component of the accessory drive location changed is stored.

This has the advantage that when applying the Elastriemens on the pulleys the belt drive does not have to be stretched. The portable Component allows the belt loose over all of this acted upon To lay components of the auxiliary drive and then by locomotion said component a tightening of Elastriemens in the ready for operation State to bring about.

Under Elimination of the known complex tensioner systems, Predominant or assembly procedures is thus a fast and easy to carry out Assuring assembly due to the comparatively gentle treatment of the belt too a lifetime increase leads, which in turn has cost advantages. In addition, by means of the local variable Component after a certain period of operation and a concomitant elongation the belt retensioning the same are performed.

In Advantageous embodiment may be provided that the spatially variable Component a fixed attachment point and a portable Attachment point has. As a result, the component during assembly of the belt drive over the Fixed mounting point always secured and does not have to be completely removed from be removed from his position. The portable attachment point allows the provision of the necessary clearance for tension-free Placing the belt drive on the components looped by it of the belt drive.

In this case, it can be provided in a further embodiment that the component is designed to be pivotable about the fixed attachment point, which is to accomplish comparatively simple measures and so ensures an overall cost-effective solution.

Prefers In this case, an adjusting means is provided, which at the location variable Attachment point of the component attacks. Is this actuating means then stored itself pivotally, it can be replaced by z. B. manual attack transmitted to the actuating means whose pivotal movement on the component be, whereby this in turn is pivoted.

Advantageous can be provided that the actuating means as a backdrop exhibiting scenery piece is formed, wherein the location adjustable attachment point engages the component in this backdrop and is guided by this. In a preferred embodiment are over end stops the scenery an assembly and a working position of the component established.

alternative For this purpose, the design can also be chosen so that at initial assembly a continuously adjustable intermediate position between the end stops for sufficient Ensures belt tension and while the further operating time towards the second end stop is delivered.

In another preferred embodiment has the adjusting means in the region of its pivotal mounting preferably steplessly deliverable actuator in this bearing point on, the component associated with the end of the link guide has.

The local variable Component is designed as an accessory, especially as a light machine can but also as a deflection roller arranged in the course of the belt drive be educated. Both the accessory and the pulley can either by means of the end stops defining backdrop design or the actuator having Backdrop improvement area be pivoted.

So is according to one Embodiment of the invention provided that the backdrop axially slidably mounted and preferably dreenktkoppelt of one Threaded rod is position adjustable. In addition, the threaded rod while swivel-mounted in a warehouse.

Short description the drawings

to Clarification of the invention, the description is a drawing accompanied based on these embodiments the invention with further features and advantages will be explained in more detail below. Show in it

1 a first embodiment of a belt drive in a mounting position,

2 a working position of the belt drive according to 1 .

3 a second embodiment of a belt drive in a mounting position, and

4 a working position of the belt drive according to 3 ,

detailed Description of the drawings

A motor vehicle, not shown, has an internal combustion engine, not shown in detail in the figures, with a belt drive 2 an accessory drive 6 on. In this belt drive 2 are several vehicle aggregates through a Elastriemen 4 drive technology connected to each other, which is guided on the pulleys of these units. These include one of the crankshaft of the engine associated and the Elastriemen 4 driving disc 8th , a drive pulley 10 on the drive shaft of an air conditioning compressor, one of an alternator 14 associated disc 16 and as a further component a deflection roller 12 ,

As 1 and 2 clarify pointing the alternator 14 according to a first embodiment of an inventively designed belt drive 2 a fixed attachment point 18 on, on which the alternator 14 is held on a console, not shown, of the internal combustion engine. Furthermore, it has a location-adjustable attachment point 20 with a threaded stud 22 on. This stud 22 intersperses a backdrop 24 one for a warehouse 26 pivoting gate piece 28 , where the scenery 24 is designed as a parabolic elongated hole.

According to 1 is the stud bolt 22 at an end stop 30 the scenery 24 and thus establishes a mounting position. A nut, not shown, is loosened on the stud 22 put on, so that the scenery piece 28 counterclockwise around his bearing 26 can be pivoted.

The Elastic belt 4 can in this position without problems on all components and units of the belt drive 2 be hung up. A pretension to stretch the belt 4 does not have to be applied to it; it runs approximately along the in 1 shown unstressed contour.

After applying the Elastriemens 4 becomes the scenery piece 28 pivoted counterclockwise. It becomes rigid with the alternator 14 connected studs 22 along the scenery 24 forcibly guided, which leads to a pivoting movement of the generator 14 counterclockwise about their fixed attachment point 18 leads. At the end of this movement comes the stay bolt 22 for contact with another end stop 32 the scenery 24 ,

The relative position of the bearing 26 in relation to the end stop 32 in the in 2 shown position is chosen so that after applying the force necessary for Ver pivoting and reaching the working position according to 2 a self-locking against swinging back the alternator 14 between the stud 22 and the scenery 24 is present. The case of the belt tension on the disc 16 transmitted force direction advantageously has the center of this disc 16 regarding the scenery piece 28 at the camp 26 ; the end stop 32 is to the right of it.

The Elastic belt 4 is according to the predefined geometry of the scenery 24 in the in 2 stretched position shown and is close to the components in the course of the belt drive 2 at. The stud 22 assigned nut can therefore be tightened and thus ensures permanently the working position of the alternator 14 ,

The second embodiment of an inventive belt drive is in 3 and 4 shown. In this belt drive is as a variable component, the deflection roller 12 present around the fixed attachment point 18 ' is eccentrically displaceable.

The scenery piece 28 ' instructs in a leadership 34 linear deliverable and here as threaded rod 36 trained adjusting means. The threaded rod 36 embraces her 38 twisted backdrop 24 ' the portable attachment point 20 ' , The scenery piece 28 ' is also around the camp 26 ' rotatably held by the around the attachment point 18 ' caused circular motion to follow.

According to 3 is the pulley 12 pivoted by means of the actuating means in a position indicating the mounting position of the belt drive position, so that the Elastriemen 4 tension-free over the components in the course of the belt drive 2 can be placed. Subsequently, the threaded rod 36 as far as twisted that by the Zustellbewegung from the backdrop 24 ' on the attachment point 20 ' transmitted movement to pivot the pulley 16 clockwise around the attachment point 18 ' leads. Here is this role 16 on the Elastriemen 4 and tensions it to the required level. The belt drive is then in the in 4 shown working position.

2

belt drive

4

Elastic Belts

6

Accessory drive

8th

disc

10

sheave

12

idler pulley

14

alternator

16

disc

18

attachment point

18 '

attachment point

19

attachment point

19 '

attachment point

22

studs

24

scenery

24 '

scenery

26

camp

26 '

camp

28

scenery piece

28 '

scenery piece

30

end stop

32

end stop

34

guide

36

threaded rod

38

rotary decoupling

Claims (12)

Belt drive ( 2 ) for the accessory drive ( 6 ) an internal combustion engine of a motor vehicle, in which a Elastriemen ( 4 ) connects the internal combustion engine and drivable ancillary units with one another in an effective manner, characterized in that at least one of the elastric belts ( 4 ) acted upon component of the auxiliary drive ( 6 ) is stored in a variable position. Belt drive according to claim 1, characterized in that the component has a fixed attachment point ( 18 . 18 ' ) and at least one portable attachment point ( 20 . 20 ' ) having. Belt drive according to claim 2, characterized in that the component around the fixed attachment point ( 18 . 18 ' ) is formed pivotable. Belt drive according to claim 3, characterized by at the location-adjustable attachment point ( 20 . 20 ' ) attacking actuating means. Belt drive according to claim 4, characterized that the adjusting means is pivotally mounted. Belt drive according to claim 5, characterized ge indicates that the actuating means act as gate piece ( 28 . 28 ' ), and the portable attachment point ( 20 . 20 ' ) in a scenery ( 24 . 24 ' ) of the gate piece ( 28 . 28 ' ) is guided. Belt drive according to claim 6, characterized in that end stops ( 30 . 32 ) the scenery ( 24 ) define a mounting position and a working position, wherein in the mounting position, the component about the fixed attachment point ( 18 ) is pivotable. Belt drive according to one of the preceding claims, characterized in that the movably mounted component an accessory or a pulley ( 12 ). Belt drive according to one of the preceding claims, characterized in that the movably mounted component as an alternator ( 14 ) is trained. Belt drive according to one of the preceding claims, characterized in that the scenery ( 24 ' ) Is mounted axially displaceable. Belt drive according to claim 10, characterized in that the scenery ( 24 ' ) rotates ( 38 ) from a threaded rod ( 36 ) is position adjustable. Belt drive according to claim 10 or 11, characterized in that the threaded rod ( 36 ) in a warehouse ( 26 ' ) is pivotally mounted.