DE102015211867A1 - Arrangement of a rotatably mounted element on a housing - Google Patents

Abstract

The invention relates to an arrangement of a rotatably mounted element on a housing. In an arrangement (10) according to the invention of a rotatably mounted element (14) on a housing (18), the bearing of the rotatably mounted element (14) takes place via a bearing element (40) arranged within the rotatable element (14). In this case, a separate, pin-like element (30), with a first longitudinal portion (34) and an opposite second longitudinal portion (36) is provided. The first longitudinal section (34) of an arrangement (10) according to the invention is fixed directly in the housing (18) in a force-locking, cohesively and / or positively locking manner. The second longitudinal section (36) is likewise fixed directly in the bearing element (40) in a force-locking, cohesively and / or positively locking manner. The arrangement (10) according to the invention has the advantage that in addition to the pin-like element (30) no further fastening elements are required and that the pin-like element (30) can be arranged to save space in the housing (18) and within the bearing element (40).

Description

The invention relates to an arrangement of a rotatably mounted element on a housing, in particular a rotatably mounted element of a traction mechanism drive, preferably in motor vehicles. Above all, the invention relates to the arrangement of a pulley, a gear or a pulley on a cylinder crankcase of an internal combustion engine of a motor vehicle. The invention also relates to a motor vehicle with such an arrangement.

Out DE 195 07 860 C2 It is known to screw a pulley, which is provided with a threaded through-hole, on a stub shaft of a machine shaft by one hand, the machine shaft held and on the other hand, the pulley is tightened with an attacking tool on the required torque on the machine shaft.

Out US 6,022,286 A It is known to unscrew a pulley on a free end of a drive shaft, the pulley for this purpose has a through hole and a partially extending over the length of the through hole internal thread. Drill key holes are provided on one end of the pulley to facilitate screwing the pulley onto the shaft.

Out DE 10 2009 004 862 A1 a tensioning device for a traction mechanism drive is known, in which a roller bearing, which has a bearing inner ring and a bearing outer ring and is part of a roller device, is pushed onto a support pin. The support pin is an integral part of a pivoting arm and has a threaded structure on which a nut member is screwed. On the nut member an axial bushing portion is formed, which has a dipping into the bearing inner ring of the rolling bearing cylindrical bearing seat for the bearing inner ring.

The invention has for its object to provide an arrangement of a rotatably mounted element on a housing, which is inexpensive and particularly space-saving feasible, in particular for implementation on a motor vehicle.

The object is achieved according to the invention with an arrangement and with a motor vehicle having the features of the independent claims. Further practical embodiments and advantages of the invention are described in connection with the dependent claims.

In an inventive arrangement of a rotatably mounted about an axis of rotation element on a housing, the storage of the rotatably mounted element via a disposed within the rotatable element bearing element. In this case, a separate, pin-like element with a first longitudinal portion and an opposite second longitudinal portion is provided. By opposite is meant in particular that the first longitudinal section comprises a first end of the pin-like element and the second longitudinal section comprises a second, opposite end of the pin-like element. The first longitudinal section of an arrangement according to the invention is direct, i. independently of other connecting elements, fixed non-positively, cohesively and / or positively in the housing. The second longitudinal section is also directly frictionally, cohesively and / or positively fixed in the bearing element. The arrangement according to the invention has the advantage that in addition to the pin-like element no further fastening elements are required and that the pin-like element can be arranged to save space in the housing and within the bearing element.

A particularly space-saving arrangement results when the second longitudinal portion of the pin-like element is disposed completely within the bearing element, i. when the pin-like element does not protrude in the axial direction with respect to an end of the bearing element facing away from the housing. In this case, no additional space is required for the arrangement on the side facing away from the housing of the bearing element, so that further elements, in particular traction means, such as. a chain or a belt, another Zugmittelgetriebes can be passed close to this side of the bearing element. This allows a dense and thus advantageous packaging, in particular in the field of an internal combustion engine of a motor vehicle.

In a further practical embodiment of an arrangement according to the invention, the first longitudinal section and / or the second longitudinal section comprises at least one external thread, wherein a corresponding internal thread is formed on the housing and / or on the bearing element. In this case, in particular a stud or a threaded pin can be used as a pin-like element, which are available at low cost as standard components. In this case, a threaded pin comprises a continuous thread which extends from the first longitudinal section to the second longitudinal section. On a stud usually two separate threaded portions are formed, which are separated from each other by an interposed shaft portion without thread. The use of grub screws has the advantage that they are easier to manufacture and thus less expensive. The use of studs has the advantage that the threaded sections are separated from each other and thus functionally independent. Moreover, with stud bolts, different diameters may also be formed in the first longitudinal section and in the second longitudinal section in order to create a particularly stable connection, for example in the region of a longitudinal section (eg in the region of the housing). Regardless of which threaded connection between the pin-like element and the bearing element is selected, the use of a threaded connection has the further advantage that the bearing element is already centered by the thread. A poor centering, as may occur, for example, in solutions in which a bearing element - yet uncentered - loosely pushed onto an axle or shaft and then clamped and centered by means of a screw, is excluded. In addition, additional elements are not required, such as, for example, axially constructing fastening nuts, screws with screw heads or clamping nuts, and in particular also nuts with an axial bushing section provided for centering and bearing.

If at least one attack profile for a clamping element is formed on the end face on the bearing element on the side facing away from the housing, the bearing element can be easily mounted in the housing by means of a corresponding clamping element. This applies in particular to arrangements in which the pin-like element comprises a first longitudinal section with an external thread and in the housing a corresponding internal thread for screwing the pin-like element is formed. As attack profile on the bearing element are in particular a hexagon socket, a Torx profile, a slot profile, a cross-slot profile and at least two recesses, which are formed in the end faces of the bearing element into consideration. Preferred are all such profiles, by means of which the effective length of the internal thread in the bearing element is not shortened. These are of the above-mentioned profiles in particular slot profiles, Phillips and two or more wells, which are designed exclusively frontally.

In principle, the bearing element may be both a sliding bearing (for example in the form of a plain bearing bush) and a rolling bearing. In particular, due to the low friction, roller bearings are preferred, wherein in such arrangements, the bearing element, which is fixed to the pin-like element, a bearing inner ring of a rolling bearing is.

The advantages of an arrangement according to the invention come into play particularly when the arrangement as a whole is to be arranged within a very small installation space. This is particularly the case when the length l _{L of} the bearing element in the area adjacent to the pin-like element is smaller than twice the inner diameter d _{L of} the bearing element, in particular if it is at most 1.5 times, 1.2 times or only 1.0 times the inner diameter d _{L of} the bearing element is. Because in this case, a sufficiently strong connection between the bearing element and the pin-like element in individual cases can only be made if the length l _{L of} the bearing element is fully or almost completely used for the connection, for example, over the full length l _{L of} the bearing element an internal thread is formed, which is in engagement with a corresponding external thread of a pin-like element.

Likewise, the invention is of particular advantage when the outer diameter of the bearing inner ring is smaller than 3 times the diameter of the second longitudinal portion of the pin-like element, preferably less than 2.5 times the diameter.

An arrangement according to the invention has been found, in particular, for rotatably mounted elements, e.g. Pulleys, gears, pulleys etc, developed that are part of traction drives. Such traction drives are part of almost every internal combustion engine of motor vehicles.

The advantages of an arrangement according to the invention are particularly of high relevance when the rotatably mounted element is part of a first traction mechanism, which is arranged adjacent to a second traction mechanism drive. The named first traction mechanism drive may be, for example, a timing drive of an internal combustion engine and the second traction drive may be an accessory drive. Such traction drives are often arranged in parallel planes close to each other, especially when a cover is required between the traction mechanism drives, wherein the distance of the planes to each other (despite the cover) may be partially only a few millimeters. For example, the distance between two elements of the two traction drives maximum 20 mm, preferably not more than 10 mm. In individual cases, the nominal distance between two traction drives is also less than 10 mm, in particular 5 mm or 7 mm.

If the first traction mechanism drive and / or the second traction mechanism drive has at least one element that changes the traction means, space problems can arise, in particular in the case of alterations or new designs, which can easily be remedied with an arrangement according to the invention.

As already explained above, the invention also relates to a motor vehicle with an arrangement as described above, in particular a motor vehicle, which is driven by an internal combustion engine, which comprises two mutually parallel control drives, which are arranged adjacent to each other.

Further practical embodiments of the invention are described below in conjunction with the drawings. Show it:

1 a first embodiment of an arrangement according to the invention in a sectional view,

2 the in 1 marked with II area in an enlarged view,

3 a second embodiment of an arrangement according to the invention in a sectional view,

4 the arrangement 3 in a perspective view according to the arrow IV in 3 .

5a / b Two illustrations of a complete traction drive with a pivotable element, which in the 5a and 5b shown in two different positions, and

6 a schematic representation of an internal combustion engine of a motor vehicle with two mutually adjacent traction mechanism drives.

1 shows an arrangement according to the invention 10 one rotatable about an axis of rotation 12 stored element 14 wherein it is in the rotatably mounted element 14 in the embodiment shown, a roller bearing roller 16 with a bearing inner ring 20 and a bearing outer ring 22 is. Between bearing inner ring 20 and bearing outer ring 22 are rolling elements in a known manner 28 arranged so that the bearing outer ring 22 relative to the bearing inner ring 20 around the axis of rotation 12 is rotatable. The bearing inner ring 20 is therefore within the rotatably mounted element 14 arranged bearing element 40 ,

The pulley 16 is part of a first traction mechanism, not shown, which is arranged in a plane perpendicular to the plane of the plane. The outer surface 24 of the bearing outer ring 22 acts as a contact surface in the embodiment shown 26 for a likewise not shown traction means of the traction mechanism drive, with which the deflection roller 16 in contact. The pulley 16 is in this respect integral with the bearing outer ring 22 educated.

The bearing of the bearing inner ring 20 the rotatably mounted element 14 takes place by means of a separate, pin-like element 30 on a housing 18 which is a cylinder crankcase in the embodiment shown. In the embodiment shown, the pin-like element is 30 around a stud 32 with a first longitudinal section 34 and an opposite second longitudinal section 36 , The first longitudinal section 34 is in the embodiment shown directly in the housing 18 screwed. The second longitudinal section 36 is also directly by means of a screw in the bearing inner ring 20 established. Between the first longitudinal section 34 and the second longitudinal section 36 indicates the stud 32 a shaft portion 38 on.

As in the 1 and 2 is recognizable, is the second longitudinal section 36 completely within the bearing element 40 arranged, ie the longitudinal section 36 protrudes in the axial direction (along the axis of rotation 12 considered) in particular on the housing 18 opposite side 42 not opposite to that as a bearing element 40 serving bearing inner ring 20 out.

On the pen-like element 30 is in the range of the first longitudinal section 34 a first external thread 44 formed, with a on the bearing element 40 trained internal thread 46 corresponds. On the pen-like element 30 is in the range of the second longitudinal section 36 a second external thread 48 formed, with one in the housing 18 trained internal thread 50 corresponds.

As in particular in 2 Good to see, one can on the case 18 opposite side arranged lid 52 in the area close to the pulley 16 be passed. In an embodiment known from practice, in which the deflection roller 16 by means of one opposite the opposite side 42 of the bearing inner ring 20 protruding in the axial direction, the lid had to 52 - As shown by dashed lines - have a recess to the outside, resulting in unchanged construction in a new generation of an internal combustion engine to a collision with a pulley 54 would have led a parallel second traction drive.

For mounting the bearing inner ring 20 on a second longitudinal section 36 is as an attack profile 56 at the housing 12 opposite end face 64 of the bearing inner ring 20 a Torx profile 58 trained (see 2 ).

The 3 and 4 show a second embodiment of an inventive arrangement, for whose at least functionally equivalent elements in the following, the same reference numerals as in the 1 and 2 be used. In the 3 and 4 are just a pin-like element 30 and a rotatably mounted element 14 shown. In the 3 and 4 not shown are a housing and the attachment of the pin-like element 30 in such a housing. This is done as already in connection with the 1 and 2 described. In the rotatably mounted element 14 In the present case, this again concerns a bearing outer ring 22 , which by means of rolling elements 28 rotatable relative to a bearing inner ring 20 is stored. The bearing inner ring 20 is in turn about one in the bearing inner ring 20 trained internal thread 46 with one in the second longitudinal section 36 trained external thread 44 engaged and thus with the second longitudinal section 36 as a stud 32 trained pin-like element 30 screwed. In the second embodiment is on the bearing outer ring 22 a separate gear 62 rotatably mounted, in particular by pressing. The bearing outer ring 22 and the gear 62 thus together form a rotatably mounted element 14 that is using the rolling elements 28 as the bearing element 40 serving bearing inner ring 20 can turn. The bearing inner ring 20 itself is non-rotatably fixed to the housing, not shown.

For mounting the bearing inner ring 20 on the second longitudinal section 36 is as an attack profile 56 on the housing (not shown) facing away from the end face 64 of the bearing inner ring 20 a Torx profile 58 trained (see 2 ). In addition, as a second attack profile 56 also in the housing facing away from the front side 64 two depressions 60 designed for a Spannschlüssel.

It is alternatively possible, only the wells 60 on or in the housing facing away from the end face 64 train and the torx profile 58 omit. In this case, the in 3 Additional length indicated by I _Z , which in the embodiment shown is for the Torx profile 58 was used for the formation of a female thread 46 and an additionally elongated threaded connection between the pin-like element 30 , eg a stud 32 , and the bearing element 40 , eg a bearing inner ring 20 , be used. This is particularly advantageous if the length l _{L of} the bearing element 40 in relation to the inner diameter d _{L of} the bearing element 40 in the region of the second longitudinal section 36 of the pin-like element 30 is small, in particular less than 1.5 times or less than 1.2 times.

In the 5a and 5b is a traction mechanism, in which as a traction means a belt 66 is used. This traction mechanism is a so-called accessory drive of an internal combustion engine of a motor vehicle.

The 5a and 5b show two different positions of a clamping element 68 and a pulley 70 , which are part of the traction mechanism and about a pivot axis 72 are pivotally mounted. The different positions which, for example, during engine start ("generator start position" position in 5a ) and can be taken after the engine start in normal engine operation ("generator load position" position), lead to a different course of the traction device. This different course leads to an enlarged area, especially where the clamping element 68 and the pulley 70 be moved during pivoting, may not collide with other elements.

As in 6 is shown schematically, are in some motor vehicles on an outside of an internal combustion engine 74 a first traction drive 76 and a second traction drive 78 arranged, wherein it is in the first traction drive 76 around an accessory unit, as in the 5a and 5b represented, acts and at the second traction drive 78 to a timing drive of the internal combustion engine 74 , The distance a between the first traction drive 76 and the second traction drive 78 is partially less than 10 mm, in particular only about 7-8 mm. The use of an arrangement according to the invention enables this particularly tight arrangement between the first traction mechanism drive 76 and the second traction drive 78 although the first traction drive 76 with the clamping element 68 and the pulley 70 (Clamping element and pulley are only in the 5a and 5b shown) has a Zugmittelverlauf changing element and thus has an increased space requirement.

The features of the invention disclosed in the present description, in the drawings and in the claims may be essential both individually and in any desired combinations for the realization of the invention in its various embodiments. The invention may be varied within the scope of the claims and in consideration of the knowledge of the person skilled in the art.

LIST OF REFERENCE NUMBERS

10

arrangement

12

axis of rotation

14

rotatably mounted element

16

idler pulley

18

casing

20

Bearing inner ring

22

Bearing outer ring

24

outer surface

26

contact surface

28

rolling elements

30

pin-like element

32

stud

34

first longitudinal section

36

second longitudinal section

38

shank portion

40

bearing element

42

Side (facing away from the housing)

44

first external thread

46

inner thread

48

second external thread

50

inner thread

52

cover

54

pulley

56

attack profile

58

Torx

60

deepening

62

gear

64

front

66

belt

68

clamping element

70

idler pulley

72

swivel axis

74

Internal combustion engine

76

first traction drive

78

second traction drive

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 19507860 C2 [0002]
• US 6022286 A [0003]
• DE 102009004862 A1 [0004]

Claims (10)

Arrangement of a about a rotation axis ( 12 ) rotatably mounted element ( 14 ) on a housing ( 18 ), wherein the mounting of the rotatably mounted element ( 14 ) via a within the rotatable element ( 14 ) arranged bearing element ( 40 ), characterized in that a separate, pin-like element ( 30 ) with a first longitudinal section ( 34 ) and an opposite second longitudinal section ( 36 ) with the first longitudinal section ( 34 ) directly frictionally, cohesively and / or positively in the housing ( 18 ) and with the second longitudinal section ( 36 ) directly frictionally, cohesively and / or positively in the bearing element ( 40 ). Arrangement according to the preceding claim, characterized in that the second longitudinal section ( 36 ) completely within the bearing element ( 40 ) is arranged. Arrangement according to one or more of the preceding claims, characterized in that the first longitudinal section ( 34 ) and / or the second longitudinal section ( 36 ) at least one external thread ( 24 ) and on the housing ( 18 ) and / or on the bearing element ( 40 ) a corresponding internal thread ( 50 ) is trained. Arrangement according to one or more of the preceding claims, characterized in that on the bearing element ( 40 ) on the housing ( 18 ) facing away ( 42 ) at least one attack profile ( 56 ) is designed for a clamping element. Arrangement according to one or more of the preceding claims, characterized in that the bearing element ( 40 ) a bearing inner ring ( 20 ) of a rolling bearing ( 28 ). Arrangement according to one or more of the preceding claims, characterized in that the length l _{L of} the bearing element ( 40 ) is less than twice the inner diameter d _{L of} the bearing element ( 40 ). Arrangement according to one or more of the preceding claims, characterized in that the rotatably mounted element ( 14 ) Part of a traction drive is. Arrangement according to one or more of the preceding claims, characterized in that the rotatably mounted element ( 14 ) Part of a first traction mechanism drive ( 76 ) which is adjacent to a second traction drive ( 78 ) is arranged. Arrangement according to the preceding claim, characterized in that the first traction mechanism drive ( 76 ) and / or the second traction drive ( 78 ) Has at least one the Zugmittelverlauf changing element. Motor vehicle with an arrangement ( 10 ) according to one or more of the preceding claims.

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