DE102017118321B4 - Roller with protection device - Google Patents

Abstract

Roller (1) with protective device (2) for a traction mechanism drive (3), wherein the roller (1) has an axis of rotation (4) and an end face (5) transverse to the axis of rotation (4) and wherein the protective device (2) the end face ( 5) completely covered in a closed state and having a cap (7) and a base member (6) which is fixedly connected to the roller (1) and to the end face (5) towards an opening (8) which by means of Cap (7) is closable, characterized in that the cap (7) and the base member (6) are hinged together by means of a hinge member (9).

Description

The invention relates to a role with protection device for a traction mechanism, such a traction drive for a drive train and such a drive train.

Rolls with protective devices are known from the prior art, as for example in the DE 10 2004 037 202 A1 is disclosed. Such protections are used to protect the bearing from damage due to external influences. Such roles with protective device find use, for example, as pulleys, for example tension rollers in a traction drive. From the DE 10 2004 037 202 A1 It is known to rotatably arrange a protective element with an opening on the bearing outer ring of a roller bearing and the opening is closed by means of a loose protective cap. It has been found that the protective cap is often lost over the life of such a roller, whether due to vibration during operation or a forgetting to reinstall the cap during maintenance.

The DE 103 25 254 C5 shows a protective device with a ring and a lid which is held by a hinge on the ring.

The DE 695 18 596 T2 shows a belt pulley with a protective cover which is secured by a clip connection to the roller.

On this basis, the present invention has the object, at least partially overcome the known from the prior art disadvantages. The features of the invention will become apparent from the independent claims, to which advantageous embodiments are indicated in the dependent claims. The features of the claims may be combined in any technically meaningful manner, for which purpose the explanations of the following description as well as features of the figures may be consulted which comprise additional embodiments of the invention.

The invention relates to a roller with protection device for a traction mechanism drive, wherein the roller has an axis of rotation and an end side transverse to the axis of rotation, and wherein the protective device completely covers the front side of the roller in a closed state, wherein the protective device comprises a base member and a cap, and wherein the base member is fixedly connected to the roller and having an opening towards the end face of the roller, wherein the opening of the base member is closable by means of the cap.

The role with protective device is mainly characterized in that the cap and the base member are hinged together by means of a hinge member.

Here, a role is proposed, for example, a deflection roller, preferably a tensioning roller for a traction mechanism, for example, a belt drive, an internal combustion engine having a protective device. The protective device is easy to assemble and is not lost in a maintenance of the role, because the cap is firmly connected to a base member and the base member is in turn firmly connected to the roller. Although the cap can be opened, but not completely removed from the base member, because the cap is always connected via the hinge member to the base member. The hinge element is a movable connection between the cap and the base element, wherein the hinge element is flexible, for example articulated and / or bendable, executed.

The advantage of such a protective device on the roller is that maintenance work, such as lubrication of the roller can be done by simply opening the cap. The cap remains in an open state, that is, when the opening of the base member is not closed, while the maintenance work is always connected to the base member, which in turn is fixedly connected to the roller. Subsequently, by simply closing the cap, the protective function of the protective device is restored.

The roller comprises a rotary bearing, wherein the rotary bearing is for example a ball bearing, a roller bearing, a needle bearing and other rolling bearings, or a sliding bearing such as a solid bearing, hydrostatic and hydrodynamic bearing.

The base element is firmly connected to the roller. Preferably, the base member is attached directly to one of the rollers, or to an intermediate member attached thereto. The protective device covers the end of the roller so far that dirt-prone areas of the role are protected. The covering function is taken over by the base element or solely by the cap. In the latter case, the base element forms only a support, a seal and / or a closure element for the cap.

The base element has on the (a) end face, that is in the plane perpendicular to the axis of rotation, the roller on an opening, so that through the opening maintenance or assembly work on the roller or the rotation bearing to be protected can be performed. The opening is in the ready state of the roll closed by the cap, so that a foreign object entry is prevented in the role.

The cap is repeatedly releasably connectable to the base member such that the opening of the base member is completely closed. This causes a particularly good seal against external influences.

According to a further advantageous embodiment of the roller, the protective device is in one piece, and preferably made of a plastic.

According to a further advantageous embodiment of the roller, the roller comprises a rotary bearing with a bearing inner ring and a bearing outer ring and the protective device is fixedly connected to the bearing outer ring, wherein the opening of the base member has an opening diameter which is greater than the outer diameter of the bearing inner ring.

Such a rotary bearing is provided with a bearing gap, which must be protected from dust and water and other environmental influences in order to maintain functionality over a long service life. The bearing inner ring is connectable with bearing bolts and carries on its outer circumference the bearing outer ring. The bearing outer ring is rotatably supported on the bearing inner ring and preferably has on its outer diameter directly or indirectly a receptacle for a traction means.

In the embodiment proposed here, maintenance and installation of the bearing is particularly simple, because by opening the cap, the spaces between the bearing outer ring and the bearing inner ring are accessible and, for example, the bearing can be greased or oiled over these spaces. Furthermore, the bearing inner ring, depending on the design of the rotary bearing, are removed through the opening. In a rolling bearing are preferably still the rolling elements or even a bearing cage, preferably with Wälzköper, removable through the opening. It is therefore not necessary to dismantle the base element.

According to a further advantageous embodiment of the roller, the base element has an inner peripheral surface, within which the bearing outer ring is received, wherein preferably the base element has an outer peripheral surface, which is adapted to receive a traction means.

In this embodiment, the base member is performed as a sleeve-like component on the bearing outer ring of the role. The base member is positively and / or positively connected to the bearing outer ring. In a preferred embodiment, the base element forms with its outer circumferential surface a receptacle for a traction means, for example a roller surface with a suitable surface shape and / or suitable friction coefficient in interaction with the traction means.

According to a further advantageous embodiment of the roller, the base element has a snap device, by means of which the base element with the roller, preferably the bearing outer ring according to an embodiment according to the above description, by means of axial sliding firmly connected.

A snap device is adapted to be pushed onto the roller, wherein a snap hook or a plurality of snap hooks when pushed, preferably automatically, elastically deflected and after reaching a predetermined mounting position behind an undercut, for example, an edge or a recess, for example, a groove, snaps back snapping , Thus, the base member is secured axially secured to the roller. Preferably, the snap device is adapted for latching with the bearing outer ring according to an embodiment as described above. The snap device engages in one embodiment on the inside and in another outside in the bearing outer ring. Particularly preferably, the snap device engages in a corresponding joining device in the frontal surface of the bearing outer ring. As a result, the axially and / or radially required space is kept low.

According to a further advantageous embodiment of the roller, the cap with the base element forms on the outer circumference of the opening of the base element an axially extending cylinder, which comprises an inner cylinder and an outer cylinder, and wherein the inner cylinder and the outer cylinder form a seal in the closed state.

By means of the cylinder an axially aligned and therefore long executable sealing distance can be formed, whereby a very good sealing effect can be achieved. The seal preferably has a labyrinth and / or a plurality of corresponding sealing surfaces on the inner cylinder and the outer cylinder of the cylinder. In one embodiment, the outer cylinder is a component of the base member and the inner cylinder is part of the cap, in another embodiment, the assignment is reversed.

According to a further advantageous embodiment of the roller, the cap and the base element are connected by means of a preferably hand-detachable, Snap connection for closing the opening of the base member are connected to each other.

In this embodiment, a particularly easy closing of the opening of the base member is ensured. The snap connection is a positive and non-positive connection, which is non-destructively releasable again. For example, the cap and the opening of the base member form a corresponding toothing, so that the cap is easily pressed into the opening. Preferably, the cap is easily by hand, preferably without the use of tools, solvable, for example by means of radial pressure on the cap or alone fixed pulling on a relative to the hinge element arranged projecting edge of the cap.

• - ein Abtriebsrad zur Drehmomentabgabe;
• - ein Nebenrad zur Drehmomentaufnahme;
• - ein Zugmittel zum Übertragen eines Drehmoments zwischen dem Abtriebsrad und dem Nebenrad; und
• - eine Rolle nach einem der vorhergehenden Ansprüche, wobei bevorzugt die Rolle eine Umlenkrolle bildet.

According to a further aspect of the invention, a traction drive for a drive train is proposed which has at least the following components:

• a driven wheel for torque output;
• - A secondary wheel for torque absorption;
• a traction means for transmitting a torque between the output gear and the sub-wheel; and
• - A roller according to one of the preceding claims, wherein preferably the roller forms a guide roller.

The traction mechanism drive proposed here is set up to transmit a torque from a driven wheel to a secondary wheel by means of a traction means, for example a belt, preferably a V-belt. The output gear is connected, for example, with a crankshaft of an internal combustion engine. The auxiliary wheel is connected, for example, to the input shaft of a generator or an air-conditioning pump. The roller is preferably a deflection roller, for example a tension roller, by means of which the traction means is deflected and / or tensioned. The role proposed here facilitates ease of assembly and serviceability of the traction mechanism drive, it being ensured that the protection device is not lost and with great certainty re-assembled correctly. If the cap breaks off due to improper handling, the presence of incorrect assembly is obvious and can be quickly remedied.

According to a further aspect of the invention, a drive train is proposed, which has a drive unit with an output shaft, at least one auxiliary unit with a secondary shaft and a traction mechanism according to the above description, wherein the output shaft via the driven gear by means of the traction drive via the corresponding auxiliary wheel with the at least one Secondary shaft is connected to transmit torque.

The drive train proposed here has a drive unit with an output shaft, for example an internal combustion engine with a crankshaft, which drives the auxiliary shaft of an auxiliary unit by means of the traction drive, for example the drive shaft of a generator or an air-conditioning pump. With the role proposed here in zugmitteltrieb a small axial space relative to the axis of rotation of the output shaft of the drive unit is maintained, at the same time the safety of proper maintenance is increased.

Most motor vehicles today have a front-wheel drive and therefore preferably arrange the drive unit, for example an internal combustion engine, in front of the driver's cab and transversely to the main direction of travel. The space is particularly small in such an arrangement. The application is similar in motorized two-wheelers, for which a significantly increased performance is required with the same space.

This problem is exacerbated in passenger cars of the small car class according to European classification. The functional units used in a passenger car of the small car class are not significantly reduced compared to passenger cars larger car classes. Nevertheless, the available space for small cars is much smaller.

Passenger cars are assigned to a vehicle class according to, for example, size, price, weight and power, and this definition is subject to constant change according to the needs of the market. In the US market, cars of the class small cars and microcars are classified according to European classification of the class of Subcompact Car and in the British market they correspond to the class Supermini or the class City Car. Examples of the micro car class are a Volkswagen up! or a Renault Twingo. Examples of the small car class are an Alfa Romeo Mito, Volkswagen Polo, Ford Fiesta or Renault Clio.

• 1: eine konventionelle Umlenkrolle mit konventioneller Schutzvorrichtung;
• 2: eine Schnittansicht einer ersten Schutzvorrichtung für eine Rolle in geöffnetem Zustand;
• 3: eine Schnittansicht der ersten Schutzvorrichtung in geschlossenem Zustand;
• 4: eine perspektivische Ansicht der ersten Schutzvorrichtung in geöffnetem Zustand;
• 5: eine perspektivische Ansicht der ersten Schutzvorrichtung in geschlossenem Zustand;
• 6: eine Schnittansicht einer zweiten Schutzvorrichtung für eine Rolle in geöffnetem Zustand;
• 7: eine Schnittansicht der zweiten Schutzvorrichtung in geschlossenem Zustand;
• 8: eine perspektivische Ansicht der zweiten Schutzvorrichtung in geöffnetem Zustand;
• 9: eine perspektivische Ansicht der zweiten Schutzvorrichtung in geschlossenem Zustand; und
• 10: ein Antriebsstrang in einem Kraftfahrzeug mit Zugmitteltrieb.

The above-described invention will be explained in detail in the background of the relevant technical background with reference to the accompanying drawings, which show preferred embodiments. The invention is not limited by the purely schematic drawings in any way, it being noted that the drawings are not dimensionally accurate and are not suitable for the definition of size ratios. It is shown in

• 1 : a conventional pulley with conventional protection device;
• 2 a sectional view of a first protection device for a roll in the open state;
• 3 a sectional view of the first protection device in the closed state;
• 4 a perspective view of the first protection device in the open state;
• 5 a perspective view of the first protection device in the closed state;
• 6 a sectional view of a second protection device for a roll in the open state;
• 7 a sectional view of the second protection device in the closed state;
• 8th a perspective view of the second protection device in the open state;
• 9 a perspective view of the second protection device in the closed state; and
• 10 : a drive train in a motor vehicle with traction drive.

In 1 is a conventional pulley 37 with a rotation axis 4 shown in which a double row ball bearing as a rotary bearing 10 with a bearing inner ring 11 and a bearing outer ring 12 between which the rolling elements 41 (here: balls), are led in a bearing cage. The rolling elements 41 are here by means of bearing seals 42 sealed. Here is the rotation bearing 10 mirror-symmetrical to the axis of symmetry 52 executed, so that the rotation bearing 10 not with a specific orientation with the bolt receptacle 43 must be listed on a (not shown) bolt. Mirror symmetric here are the conventional Zugmittelaufnahme 40 with the bearing receiver 51 and the conventional protective cover 38 is two times on both ends of the conventional pulley 37 arranged. The conventional protective cover 38 has a slightly larger diameter 48 the conventional opening 44 on, as the outside diameter 47 of the bearing inner ring 11 , The conventional protective cover 38 is by means of a snap hook 46 by means of an engagement groove 45 with the bearing receiver 51 the conventional Zugmittelaufnahme 40 connected. The conventional opening 44 is on a front page 5 the conventional pulley 37 by means of a conventional cap 39 releasably closable, being between the conventional cap 39 and the conventional pulley 37 no permanent connection exists. The conventional cap 39 is only by means of a snap hook 50 by means of an engagement groove 49 with the conventional protective cover 38 releasably connected.

2 to 5 show a first embodiment of a protection device 2 , In 2 and in 3 are each a sectional view of the protection device 2 shown and in 4 and in 5 each a perspective view, wherein the protective device 2 in 2 and in 4 in the open state and in 3 and in 5 is shown in the closed state.

In 2 is the cap on the left in the illustration 7 shown, which by means of a hinge element 9 , here a bendable plastic element, with the base element 6 captive firmly connected. The basic element 6 is by means of a snap device 18 on a bearing outer ring 12 or a warehouse receipt 51 a conventional Zugmittelaufnahme 40 , for example as in 1 shown, fastened. This is in this example a snap device 18 for einklickenden connecting with a corresponding engagement groove 45 intended. In the 1 illustrated conventional protective cover 38 becomes at the front side 5 through the base element 6 replaced. Central at the axis of rotation 4 concentric with a rotary bearing 10 to arrange is an opening 8th provided, through which maintenance on the rotary bearing 10 can be made. In the embodiment shown here is on the outer circumference 19 the opening 8th an axially away from the rotary bearing 10 extending inner cylinder 21 provided on which an outer cylinder 22 by means of a snap connection 24 the cap 7 is clickable. In 3 is the cap on the inner cylinder 21 shown clicked, so that the inner cylinder 21 and the outer cylinder 22 together a cylinder 20 form, which preferably has an axially aligned seal 23 forms. In 4 and 5 the functional relationship is clarified again by means of a perspective representation and it is on the description with respect to 2 and the 3 directed.

In 6 to 9 is a role 1 with a protection device 2 or a protective device 2 shown in a second embodiment. In 6 and in 7 are each a sectional view of the role 1 shown and in 8th and in 9 in each case a perspective view of the protective device 2 , where the role 1 or protective device 2 in 6 and in 8th in the open state and in 7 and in 9 is shown in the closed state.

The basic element 6 is in 6 to 9 with one of the inner peripheral surface 15 on a bearing outer ring 12 a rotation bearing 10 , of which here only continue the bearing inner ring 11 is shown, applied and holds here preferably purely non-positively, for example by means of pressing associations. Preferably, the base element forms 6 on its outer peripheral surface 16 a tread for a traction means 17 , which is indicated here purely schematically. The protection device 2 is with its base element 6 concentric with the axis of rotation 4 of the rotation bearing 10 aligned. At the upper end in the illustration 5 is a cap 7 provided, which by means of a hinge element 9 closable. The hinge element 9 is for example as a tab of the cap 7 with swivel joint (not shown in detail) and with the base element 6 articulated firmly connected. This is the opening 8th completely coverable (compare 7 ). The opening 8th the protection device 2 here has a large opening diameter 13 on which here even larger than the bearing outer ring 12 is, but at least greater than the outer diameter 14 of the bearing inner ring 11 , In 7 is the relationship between the base element 6 and the cap 7 the protection device 2 illustrated by the representation of the closed state. Incidentally, the description regarding 6 directed.

In the 8th and 9 is a perspective view of the protective device 2 shown, by means of which the functioning of the protection device 2 is further illustrated, of which the rotary bearing 10 (see 6 and 7 ) only the bearing outer ring 12 is shown. In 8th is unlike the illustration in 6 and in 7 two further axially extending snap elements for a snap connection 24 shown, which in the closed state with the base element 6 positively and / or non-positively connected. This closes the cap 7 the opening 8th for sure.

In 10 is a powertrain 25 in a motor vehicle 32 with a traction drive 3 shown schematically. Here is a drive unit 28 , shown as a three-cylinder internal combustion engine, with its motor axis 36 transverse to the longitudinal axis 34 and in front of the driver's cab 33 of the motor vehicle 32 arranged. The output shaft 29 of the drive unit 28 is by means of a driven gear 26 set up as a drive for the traction drive. Alternatively, the output shaft 29 by means of the accessory 30 , For example, a starter generator, via the traction drive 3 drivable. For this purpose is a traction device 17 , For example, a belt provided, which around the secondary wheel 27 of the accessory 30 to the output gear 26 and in the same way for driving an (optional) air conditioning pump 35 curious; excited. This is at least a role 1 with protection device 2 (see 2 to 9 ) provided according to an embodiment according to the above description, which here for example as a tensioning roller for tensioning the traction means 17 is used.

By means of the roll with protective device proposed here, reliable protection of the rotary bearing of the roll over the entire service life and also after maintenance work is ensured.

LIST OF REFERENCE NUMBERS

1

role

2

guard

3

traction drive

4

axis of rotation

5

front

6

base element

7

cap

8th

opening

9

hinge element

10

rotary bearings

11

Bearing inner ring

12

Bearing outer ring

13

Opening diameter

14

outer diameter

15

Inner circumferential surface

16

Outer circumferential surface

17

traction means

18

snap device

19

outer periphery

20

cylinder

21

inner cylinder

22

outer cylinder

23

poetry

24

snap

25

powertrain

26

output gear

27

side gear

28

power unit

29

output shaft

30

accessory

31

spurious

32

motor vehicle

33

cab

34

longitudinal axis

35

air pump

36

motor axis

37

conventional pulley

38

conventional protective cover

39

conventional cap

40

conventional traction absorption

41

rolling elements

42

bearing seal

43

bolt Hole

44

conventional opening

45

Engagement groove for the conventional protection device

46

Snap hook of the conventional protection device

47

Outer diameter of the bearing inner ring

48

Diameter of the conventional opening

49

Engagement groove for the conventional cap

50

Snap hook of the conventional cap

51

bearing seat

52

axis of symmetry

Claims (9)

Roller (1) with protective device (2) for a traction mechanism drive (3), wherein the roller (1) has an axis of rotation (4) and an end face (5) transverse to the axis of rotation (4) and wherein the protective device (2) the end face ( 5) completely covered in a closed state and having a cap (7) and a base member (6) which is fixedly connected to the roller (1) and to the end face (5) towards an opening (8) which by means of Cap (7) is closable, characterized in that the cap (7) and the base member (6) are hinged together by means of a hinge member (9). Roll (1) to Claim 1 , wherein the protective device (2) is made in one piece and made of a plastic. Roll (1) to Claim 2 wherein the roller (1) comprises a rotary bearing (10) with a bearing inner ring (11) and a bearing outer ring (12) and the protective device (2) is fixedly connected to the bearing outer ring (12) and wherein the opening (8) of the base element (8) 6) has an opening diameter (13) which is larger than the outer diameter (14) of the bearing inner ring (11). Roll (1) to Claim 3 wherein the base member (6) has an inner peripheral surface (15) within which the bearing outer ring (12) is received, and an outer peripheral surface (16) adapted to receive a traction means (17). Roll (1) to Claim 3 or 4 , wherein the base element (6) has a snap device (18), by means of which the base element (6) with the bearing outer ring (12) is firmly connected by means of axial sliding. Roller (1) according to one of the preceding claims, wherein the cap (7) with the base element (6) on the outer circumference (19) of the opening (8) an axially extending cylinder (20) with an inner cylinder (21) and an outer cylinder ( 22) and wherein the inner cylinder (21) and the outer cylinder (22) form a seal (23) in the closed state. Roller (1) according to one of the preceding claims, wherein the cap (7) and the base element (6) are connectable to each other by means of a manually releasable snap connection (24) for closing the opening (8) of the base element (6). Traction drive (3) for a drive train (25), comprising at least the following components: - A driven gear (26) for torque output; - A secondary wheel (27) for receiving torque; - a traction means (17) for transmitting a torque between the output gear (26) and the secondary wheel (27); and - A roll (1) according to any one of the preceding claims, wherein the roller (1) forms a deflection roller. Drive train (25) comprising a drive unit (28) with an output shaft (29), at least one auxiliary unit (30) with a secondary shaft (31) and a traction mechanism drive (3) according to Claim 8 , wherein the output shaft (29) via the output gear (26) by means of the traction mechanism (3) via the corresponding auxiliary wheel (27) with the at least one auxiliary shaft (31) is connected to transmit torque.

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