DE102017118233A1 - Ring tensioner with tensioning roller-positioning adjustment means - Google Patents

Abstract

The invention relates to a ring tensioner (1) for a motor vehicle starter-generator drive, comprising a first base body (2) on which a first tensioning roller (3) is rotatably connected for abutment with a belt (4), wherein a spring (6) between the first basic body (2) and a second basic body (5) is integrated so that the second basic body (5) is pushed away from the first basic body (2), so that a second tensioning roller (8) rotatably connected to the second basic body (5) tensioning the belt (4), wherein adjusting means (9) engage at least one of the tensioning rollers (3, 8) for determining the axial position of the tensioning roller (3, 8) to effect a change in the biasing force applied by the spring (6).

Description

The invention relates to a ring tensioner, which can also be referred to as pendulum tensioner or decoupling, for a motor vehicle starter-generator drive, with a first body to which a tensioner is rotatably connected to rest on a belt, wherein a spring between the first body and a second base body is so integrated that the second base body is pushed away from the first base body, so that a rotatably connected to the second base body second tensioning roller biases the belt, which wraps around a starter generator fixed role. In the case of decoupling clamps, in addition, the first or second basic body is preferably mounted so as to oscillate around the generator axis in a base plate which is fastened to the generator or base motor.

Adjacent prior art is from the documents DE 20 2008 002 279 U1 . FR 2 956 459 A1 and the EP 1 907 728 B1 known. Such ring clamps are traction mechanism, which are used in a traction drive. This traction mechanism drive has a primary drive shaft, such as an internal combustion engine or an electric motor, and one or more output shafts for driving ancillaries, such as generators, water pumps and air conditioning compressors on. Operationally, one of the output shafts may be temporarily driving, such as in starter-generator applications. In this case, the ring clamp comprises this output shaft, which can act as a drive shaft for a short time. It should be noted that ring clamps may have basic body, which are formed as a closed base plate.

Usually, those springs used in ring tensioners are designed as bow springs. A pendulum axis about which the ring tensioner oscillates is typically arranged concentrically with the axis of rotation of the starter-generator shaft. The oscillation must take place when the corresponding slack side of the belt, such as the dry belt, is tensioned. Depending on the operating state, that is, depending on whether the starter-generator is driven or drives, namely, the slack side changes. In one state, the empty strand is thus the Zugtrum, while in the other operating state is exactly vice versa. When changing the states oscillates the ring tensioner.

However, there are currently still disadvantages in the support. The resulting spring and Zugmittelvorspannung is unfortunately always different. This is due to the different tolerances. Thus, there are length tolerances in the belt, position and diameter tolerances on the tension rollers and tolerances on the spring. Operational variations in the length of the belt, such as due to temperature changes, must also be compensated. Due to the fluctuations and tolerances of the working range of the opening angle of the tensioner must be selected to be large enough to tension the traction means, so the belt, even in all operating conditions against dynamic vibrations and lead. Even with minimal opening angle but still a minimum required biasing force of the spring must be ensured, which is why the spring must be sized larger and the leverage is higher at a certain tolerance position. According to the spring characteristic, this results in a very high preload force at the largest opening angle.

It is the object of the present invention to avoid or at least alleviate the disadvantages known from the prior art. In particular, tolerances should be compensated.

It is therefore proposed that adjusting means engage at least one of the tension rollers for determining the axial position of the tension roller to pull a change in the biasing force applied by the spring by itself.

In other words, it is proposed that the manufacturer-induced fluctuations in the length of the belt and during assembly of the ring tensioner by a displacement of at least one tensioning roller relative to the respective base body, in particular to a housing lever or a ring lever, when setting - ie before the beginning of regular operation - to achieve.

Advantageous embodiments are the subject of the dependent claims and are explained in more detail below.

Thus, it is advantageous if the adjusting means have a setting eccentric or a slider, over or over which the spatial position of a tensioning roller to the other is adjustable. A greater or lesser tension of the belt is thereby forced preset. The use of the adjustment eccentric makes it possible to resort to known eccentric solutions, whereas the use of a sliding element makes it easier to use a relative to the eccentric solution, i. weight-optimized, solution allows.

In a further embodiment, it has proven useful if the first base body or the second base body has an eye, wherein on the one hand in the eye an eccentric is inserted, which has an eccentric to the outer contour tension roller bearing contour, mounted on the first tensioning roller or the second tensioning roller is, or on the other hand, in the eye, the slider, which is movable relative to the latter preferably perpendicular to its central axis, on which the first tensioning roller or the second tensioning roller is mounted, is inserted into the eye. In the first case, a cost-prefabricated eccentric roller can be used, whereas in the second case a fairly light, for example. Made of plastic slider is used in the manner of a sliding sleeve. This second variant is particularly weight-optimized.

The assembly is improved when the eccentric roller has a sleeve portion on which a hub of the tension roller is placed, wherein the sleeve portion is eccentric to a Augenkontaktierabschnitt.

The use of conventional fasteners, such as screws, is simplified when extending through the eccentric roller a hole for receiving a fastening screw. On the other hand, of course, there may be a thread for securing the tension roller to the eccentric roller, whereby the use of many items is reduced. Both leads to a cheaper and faster installation.

A stepless adjustment is particularly simple when the eye forms a slot along the longitudinal axis of the slide sleeve designed as a slider is movable to a position in which it is relative to the eye-facing base body fixed by a fixing means. Particularly cost is the use of an adjusting screw as a fixative.

This embodiment can also be developed by the fact that the longitudinal axis of the elongated hole is aligned in the direction of movement of the main body carrying the adjustable tension roller or aligned obliquely to it. An angle α of about 10 ° to about 20 ° is desirable.

A further embodiment is characterized in that in the adjustable tension roller bearing base body a lockable in its pivot position rotary joint is present, so that a tensioning roller-bearing body portion occupies a predetermined angle to the rest of the body. A ring and / or housing lever can be partially articulated, so that the pivotable area can be bent to the fixed area depending on the tolerance position. After adjustment, the joint is positively and / or non-positively fixed to produce a rigid connection between the two areas. Conceivable here would be the use of a Hirth toothing or other plan serration. The adjustment may be by means of a force-enhancing lever or other adjustment mechanism, e.g. be carried out using a set screw. For cost reasons, the use of an adjusting screw for locking advantage.

While in the embodiment with a swivel to achieve a kinking a particularly robust solution is proposed, the two other embodiments with the adjustment eccentric and the slider are in any case finer. In the former of these two exemplary embodiments, when the eccentric is rotated by means of a tool, the tensioning roller is displaced more or less in the direction of the belt until the desired spring preload is achieved by a corresponding deflection, for example secured by reaching a target marking. When tightening the tension roller screw, the clamping of the eccentric in the set position against the lever takes place at the same time. To hold the position can be mounted between the flange of the eccentric and the lever a detent, a micro-toothing or a coating. As tools offer Allen, Torx, hook or wrench tools.

As already explained, the eccentric can also be extended in the axial direction, that is to say comprise a type of threaded pin, namely as a replacement for a fastening screw on which a threaded nut with disks for clamping the tensioning roller and the eccentric can be fastened. The advantage here is that the adjustment tool and the wrench can be applied from the same page.

A mounting thread and a pin for centering the idler roller bearing are displaced with the eccentric, when the eccentric solution is selected with fastening screw. In the eccentric solution with thread only the bearing pin needs to be arranged eccentrically to the eye.

In the sliding piece inserting solution, an eye is included in the housing and / or ring lever, which is designed as a slot, by a slider is arranged along the long hole longitudinal axis, which includes the bearing pin and the mounting thread. The displacement of the tensioning roller is then preferably carried out in the installed state against the belt force by means of a screw or a lever, wherein a default setting with prior detection of the tolerance position is conceivable. The slot may be present in a position where the longitudinal axis of the slot is parallel to the direction of the biasing force or oblique, i. at an angle thereto, is arranged. In an angular arrangement, not all the biasing force of the translating force counteracts, whereby lower holding forces for holding the position during the setting process of the rolling are required.

An embodiment may also be characterized in that the adjusting means are driven by an electric motor, so as to adjust the Spannradposition embedded in a control loop during operation. Such an electromotive actuation may be desired, in particular if the tolerance of the belt pretension is also to be varied depending on load, temperature and / or wear.

• 1 eine Draufsicht auf einen erfindungsgemäßen Ringspanner in einem riemenspannenden Zustand,
• 2 eine Vergrößerung des Bereiches II aus 1, bei der eine Exzenterlösung dargestellt ist,
• 3 ein Querschnitt entlang der Linie III aus 2 durch das bei diesem Ausführungsbeispiel eingesetzte exzenternutzende Justiermittel,
• 4 eine Befestigungsschraube vermeidende Variante zum in 3 eingesetzten exzenternutzenden Justiermittel,
• 5 das Detail aus 1 in einem anderen Ausführungsbeispiel, bei der ein Gleitstück in einem als Langloch ausgebildeten Auges des Justiermittels verschieblich ist,
• 6 einen Querschnitt durch das in 5 gezeigte Ausführungsbeispiel entlang der Linie VI,
• 7 der Einsatz eines Montagehebels bei Einsatz des Ausführungsbeispiels der 5 und 6 während des Spannens in einer zu 1 vergleichbaren Darstellungsweise,
• 8 ein weiteres Ausführungsbeispiel während des Spannens in einer zur 1 vergleichbaren Darstellungsweise,
• 9 noch ein Ausführungsbeispiel, das ein Drehgelenk in einem der Grundkörper einsetzt, wobei jedoch das Drehgelenk im, verglichen zum Ausführungsbeispiel der 8, anderen Grundkörper enthalten ist und
• 10 eine weitere Ausführungsform in einer zur der in 3 dargestellten Ausführungsform vergleichbaren Weise, bei nur schematischer Ausgestaltung eines Untersetzungsgetriebes und eines Motors.

The invention will be explained in more detail with the aid of a drawing. Show it:

• 1 a top view of a ring tensioner according to the invention in a belt-tensioning state,
• 2 an enlargement of the range II out 1 , in which an eccentric solution is shown,
• 3 a cross section along the line III out 2 by the eccentric adjusting means used in this embodiment,
• 4 a fastening screw avoiding variant to in 3 inserted eccentric adjusting means,
• 5 the detail 1 in another embodiment, in which a slider is displaceable in an eye formed as a slot of the adjusting means,
• 6 a cross section through the in 5 embodiment shown along the line VI,
• 7 the use of a mounting lever when using the embodiment of 5 and 6 while relaxing in one too 1 comparable presentation,
• 8th Another embodiment during clamping in a for 1 comparable presentation,
• 9 Yet another embodiment, which uses a hinge in one of the base body, but wherein the hinge in, compared to the embodiment of 8th , other basic body is included and
• 10 another embodiment in one of the in 3 illustrated embodiment comparable manner, with only a schematic embodiment of a reduction gear and a motor.

In the 1 is a first embodiment of a ring tensioner according to the invention 1 shown. The ring tensioner 1 has a first basic body 2 , At the first body 2 is at a distal end a first tensioning roller 3 rotatably mounted. The first tensioner 3 is in contact with one as a belt 4 trained traction means.

Relative to the first basic body 2 is a second body 5 available. The second basic body 5 and the first body 2 limit a spring 6 , The spring thus exerts a biasing force on both the first body 2 , as well as on the second body 5 on. The feather 6 is as a bow spring 7 educated.

At the first base body 2 opposite end of the second body 5 is a second tensioner 8th rotatably arranged. The feather 6 urges the tension rollers 3 and 8th towards each other, to the belt 4 to stretch.

They are adjusting agents 9 but included in 1 not shown. This is more on the 2 to 9 directed. In the 1 only the position is indicated at which the adjusting means 9 can be used, wherein they in the 2 to 9 are outlined in more detail.

The ring tensioner 1 can be in pendulum direction 10 move and the second body 5 can basically be in biasing direction 11 move. In the embodiments of the 2 to 4 is on an eccentric solution for the adjustment 9 set.

Thus, in the embodiment of the 2 and 3 on the one hand and the embodiment of the 4 on the other hand, a setting eccentric 12 used. The adjustment eccentric 12 has an eccentric role 13 , This eccentric role 13 is in one eye 14 on the second base body 5 available. The eccentric role 13 has a tension roller bearing contour 15 , The tension roller bearing contour 15 is eccentric to an outer contour 16 the eccentric role 13 which in the eye 14 is used. The tension roller bearing contour 15 can be used in particular as a centering pin or centering collar 22 be formed and be a hole, in particular a through hole. In the hole, the reference numeral 17 can be referenced, a thread 18 for fixing a fixing screw 19 to be available.

On the tension roller bearing contour 15 is a hub 20 put on, for example, pressed on. The hub can then be a conventional rolling bearing 21 to have. It can be the centering collar 22 be included. It can be an approach 23 on the eccentric roller 13 be held to allow a tool insert, such as the use of a hook wrench or a wrench.

In 4 a mounting screwless eccentric roller design is reproduced, in which case a special thread 24 is held to be in the hub 20 to be screwed. A tool insert recess 25 is available to allow the use of an Allen key. Better, than the hub 20 on the thread 24 it is when only one fixing nut on the thread to screw 24 is screwed to the hub 20 on the eccentric role 13 set.

In the 5 to 7 is shown a further embodiment, which places on a Gleitzlösung instead of an eccentric solution. It is a slider 26 in the manner of a sliding sleeve 27 in the second body 5 used. The eye 14 in the second main body 5 is here as a slot 28 educated. A longitudinal axis 29 through the slot 28 in the eye 14 along which the slider 26 is movable at an angle α relative to the biasing force direction 30 which of the spring 6 is applied, aligned. The angle α can be between 10 and 20 °. On the slider 26 is the second tensioner 8th rotatably mounted, in particular, the hub 20 fixed there. This is a fixing screw 19 used, as in the 6 easy to recognize. On the slider 26 is a centering pin 31 present on which the hub 20 pressed.

Coming back to 2 and 5 it should be mentioned that a Einstellmarkierung 32 may be present, the conclusions on the spring 6 currently applied preload force allows. At this time, in the embodiment of the 5 to 8th an adjustment screw 33 positional fixing on the sliding sleeve 27 act.

The applied by the belt counterforce then drives the sliding sleeve 27 in the direction of the adjusting screw 33

Of the 7 is the use of a mounting lever to take during setting, this mounting lever by the reference numeral 34 is provided.

Deviating embodiments, namely those that use a swivel or buckling solution are in the 8th and 9 played. The local embodiments each put on a hinge 35 , once in the first main body 2 and once in the second main body 5 ,

The first variant is in the embodiment according to 8th reproduced, the second in the embodiment according to 9 is reproduced. In both cases, however, there is a fixed part 36 and a swiveling part 37 , The deflection or pivoting position is indicated by a dashed line, which by the reference numeral 38 is provided. The second caster 8th is in its deflected position. This encompasses the belt 4 a role 39 that stuck with a starter generator shaft 40 connected is.

In the 10 Another embodiment is shown in the ring tensioner 9 in the context of one of a motor 32 driven reduction gear 41 is used. It is in one area 43 a game provided.

LIST OF REFERENCE NUMBERS

1

ring Spanner

2

first basic body

3

first tension roller

4

belt

5

second basic body

6

feather

7

bow spring

8th

second tensioner

9

adjusting

10

the direction of swing

11

biasing direction

12

adjusting eccentric

13

eccentric

14

eye

15

Tensioner bearing contour

16

outer contour

17

hole

18

thread

19

fixing screw

20

hub

21

roller bearing

22

spigot

23

approach

24

thread

25

Tool insertion recess

26

slide

27

sliding sleeve

28

Long hole

29

longitudinal axis

30

Biasing force direction

31

spigot

32

setting mark

33

adjustment

34

mounting lever

35

swivel

36

fixed part

37

swiveling part

38

pivot position

39

role

40

Starter-generator shaft

41

Reduction gear

42

engine

43

play area

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 202008002279 U1 [0002]
• FR 2956459 A1 [0002]
• EP 1907728 B1 [0002]

Claims (10)

Ring tensioner (1) for a motor vehicle starter-generator drive, with a first base body (2) on which a first tension roller (3) for abutment with a belt (4) is rotatably connected, wherein a spring (6) between the first body (2) and a second base body (5) is so integrated that the second base body (5) is pushed away from the first base body (2) so that a second tensioning body (8) rotatably connected to the second base body (5) engages the belt (4 ), characterized in that adjusting means (9) on at least one of the tension rollers (3, 8) for determining the axial position of the tension roller (3, 8) engage to effect a change of the spring (6) applied biasing force. Ring tensioner (1) to Claim 1 , characterized in that the adjusting means (9) have a setting eccentric (12) or a slider (26), via or over which the spatial position of a tension roller (3, 8) to the other tensioning roller (8, 3) is adjustable. Ring tensioner (1) to Claim 1 or 2 , characterized in that the first base body (2) or the second base body (5) has an eye (14), wherein in the eye (14) an eccentric roller (13) is inserted, which has a to the outer contour eccentric tension roller bearing contour (15) on which the first tensioning roller (3) or the second tensioning roller (8) is mounted, or wherein in the eye a in this perpendicular to its central axis movable slider (26) is inserted, on which the first tensioning roller (3) or the second tensioning roller (8) is mounted. Ring tensioner (1) to Claim 3 , characterized in that the eccentric roller (13) has a sleeve portion on which a hub (20) of the tension roller (3, 8) is placed, wherein the sleeve portion is eccentric to a Augenkontaktierabschnitt. Ring tensioner (1) to Claim 3 or 4 , characterized in that by the eccentric roller (13) has a hole (17) for receiving a fastening screw (19) or a thread (18) for fixing the tensioning roller (3, 8) is present. Ring tensioner (1) to Claim 2 or 3 , characterized in that the eye (14) forms a slot (28), along the longitudinal axis (29) of the slider (26) is movable to a position in which it relative to the eye (14) having base body (2, 5) can be fixed by a fixing agent. Ring tensioner (1) to Claim 6 , characterized in that the fixing means is an adjusting screw (33). Ring tensioner (1) to Claim 6 or 7 , characterized in that the longitudinal axis (29) in the direction of movement of the adjustable tension roller (3, 8) carrying the base body (2, 5) is aligned or obliquely aligned with it. Ring tensioner (1) to Claim 1 characterized in that in which the adjustable tension roller (3, 8) carrying the base body (2, 5) a lockable in its pivot position rotary joint (35) is present, so that a tensioning roller (3, 8) supporting body portion a predetermined angle to the rest of the body occupies. Ring tensioner (1) to Claim 9 , characterized in that for locking an adjusting screw (33) is inserted and / or that the adjusting means (9) are driven by an electric motor, thus embedded in a control loop to adjust the Spannradposition during operation.

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