DE102004037202A1 - Protective element for a bearing - Google Patents

Abstract

The invention relates to a bearing (1) with a bearing inner ring (2) and a surrounding outer bearing ring (3), which are rotatable relative to each other, and in which on the bearing outer ring (3) a non - rotatably mounted bearing outer part (4) is arranged on which a protective element (5) is axially mountable. DOLLAR A The object of the invention is to protect the bearing (1) regardless of a possibly already in the camp (1) provided bearing sealing ring (17) against the ingress of dust and the action of external influences such as rockfall. In this case, the determination of the bearing inner ring (2) on a bearing part even with already mounted protective element (5) should be possible. Next, the centricity and rigidity of the determination of the bearing inner ring (2) should not be affected by an additional element between the fastener and bearing inner ring (2) and a simple assembly of the protective element (5), in particular without making a radial alignment, be guaranteed. Next, the subject invention should be characterized by a geometric manufacturing technology simple design. DOLLAR A For this purpose it is provided that the protective element (5) is substantially rotationally symmetrical and has a circular opening (7) whose diameter is slightly larger than the outer diameter (8) of the bearing inner ring (2) and its center in the mounted state on the axis of rotation (12) of the bearing (1) is located.

Description

Territory of invention

The The invention relates to a bearing with a bearing inner ring and a this surrounding bearing outer ring, wherein these bearing rings are rotatable relative to each other, and in the one on the bearing outer ring non-rotatably mounted bearing outer part rotatably is arranged, on which a protective element is mounted axially.

background the invention

such Protective elements serve to protect the bearing from particulate matter and, in particular, coarse dust as well as from damage by rockfall or similar external influences. she especially in roller bearings for traction mechanism, for example for tension roller bearings for Automotive belt drives Use.

From the DE 297 11 143 U1 a bearing for a clamping device is already known, which carries a bearing outer part, on which a closed lid can be plugged. The lid is provided with a plurality of snap elements which cooperate with counter snap elements of the bearing outer part. When mounting the lid of this must be rotated until the snap elements are aligned with the Gegenschnappelementen, wel Ches difficult assembly. Due to the fact that the cover covers the entire bearing on the face side, it can only be mounted on a bearing journal or the like after assembly of the bearing. If this installation step is forgotten or if the cover is removed by any circumstance, the bearing is unprotected.

The EP 694 703 A1 discloses a lid assembly for protecting a bearing for a belt assembly for belt drives, which has substantially the same shortcomings as the aforementioned prior art. Again, a closed lid is provided, which is held by locking devices on a roll, and must be aligned before assembly by appropriate rotation to the role in order to lock the locking elements can. Due to the closed nature of the lid, the mounting of the lid on the roller is also possible only after the mounting of the bearing on a bearing journal and can therefore be easily forgotten.

The device according to the DE 43 43 429 C2 offers over the above-mentioned technical solutions the advantage that a protective cap disclosed here can be snapped onto an inner hub part of a tensioner without having to align beforehand locking elements by rotation to each other. However, the assembly of the protective cap is only possible here after a bearing fixing screw has been mounted in the inner ring of the bearing.

Of the Applicant is known a further technical solution in which a domed closed cap also on an inner hub part of a Tensioner can be snapped, without previously locking elements by To align rotation to each other. Also this protective cap but can only after the assembly of cooperating with the bearing inner ring Fastening element to be mounted.

A different construction of a seal for a rolling bearing of a roller shows the US 6,357,926 B1 , Here, a cylindrical bushing part is inserted into the inner ring of the bearing and the area bridged to the outer ring of the La gers by an integrally formed cranked disc. In this solution, the seal is rotatably mounted on the inner ring of the bearing and therefore has a fundamentally different construction than the said protective elements. Furthermore, there is a risk that the centricity and bending stiffness of the bearing fixing is negatively influenced by the lying between the bearing inner ring and one of the attachment of the bearing screw screw material of the socket.

The Applicant is finally known a similar solution, which is based essentially on a cap which is inserted with a sleeve-like portion in the bearing inner ring and the area between the bearing inner ring and bearing outer ring in the manner of a disc covers, wherein the edge of the disc can be so cranked in that the peripheral outer edge of the bearing outer ring is covered. An assembly of the bearing is possible even after mounting the cap by a recess in the bush-like area. Although this construction provides an improvement over the geometric conditions US 6,357,926 B1 However, does not solve the problems described above, in principle.

Task of invention

The invention has for its object to protect a bearing regardless of a possibly already provided in the bearing bearing ring against the ingress of dust and the action of external influences, such as rockfall. The attachment of the bearing inner ring to a bearing part should be possible even with already mounted protection element. Next is the Zentrizi The stiffness and the determination of the bearing inner ring are not affected by an additional element between a fastener and the bearing inner ring and a simple installation of the protective element, in particular without having to make a radial alignment, be guaranteed. In this case, the subject invention should be characterized by a geometric manufacturing technology simple design.

Summary the invention

Of the Invention is based on the finding that a faulty Assembly by omitting a protective element for a bearing can best be prevented by this protective element is already mounted before the final assembly of the camp, preferably still before delivery of the component in which the bearing is installed, to the final assembly point. The protective element is also intended for installation do not need to be removed. This is done by a circular Opening in the area of the bearing inner ring reached, the one Determining the bearing inner ring on another component also after the mounting of the protective element allowed. A negative influence the centricity and flexural rigidity of the mounting of the bearing inner ring is characterized avoided that the protective element on a bearing outer part is fastened, so for example, at the hub part of a sprayed onto the bearing outer ring Role.

The Asked task is according to the characteristics of the main claim is solved by a bearing in which a on the bearing outer ring non-rotatably mounted bearing outer part is provided, on which a protective element is axially mountable. This protective element is essentially rotationally symmetrical formed and has a circular opening, whose Diameter slightly greater than the outside diameter of the bearing inner ring, and its center in the assembled state lies on the axis of rotation of the bearing.

When Bearing comes with any suitable design such as ball bearings, Roller bearings, needle roller bearings and other rolling bearings, but also plain bearings such as solid bearings, hydrostatic and hydrodynamic bearings in Question.

The under claims describe preferred developments or refinements of Invention.

For the assembly Of the bearing, it is particularly advantageous if the largest axial Extension of the bearing inner ring of the bearing is greater than the maximum axial Extension of the protective element. In this case, the bearing can be without further intermediate elements, for example by means of a through the Bore of the bearing inner ring guided Bearing fixing screw or a bolt mounted on a flat surface be without the protective element in contact with this surface comes.

Other Embodiments are conceivable, but require an axial bearing surface for the bearing inner ring, which at no point so far over the outside diameter of the bearing inner ring protrudes, that there is a contact with the protective element comes. Possible are also corresponding intermediate elements between the bearing inner ring and the bearing surface.

The Bearing outer part The aforementioned bearing may preferably have a circumferential groove. The Protective element has in this case a peripheral edge with an annular bulge, in the mounted state of the protective element in the circumferential Nut snapped the bearing outer part is. this makes possible a particularly simple mounting of the protective element on the bearing outer part, because both joining surfaces are rotationally symmetrical are and therefore a radial alignment between the protective element and Bearing outer part eliminated.

These solution is also production technology particularly favorable, since a circumferential Groove relatively easy and, if necessary, even later on cost-effective attach a rotationally symmetrical part. Manufacturing technology still it is more advantageous, however, if the circumferential groove already in the manufacture of the bearing outer part arises in which, for example, the injection mold or casting mold an encapsulation or encapsulation of the bearing outer ring with the bearing outer part designed accordingly.

In a development of this embodiment, the bearing outer part also over have a circumferential groove and the protective element have a plurality of latching hooks, the snapped into the circumferential groove in the assembled state of the protective element are. The locking hooks can especially easy by the interruption of the circulating Ringes through breakthroughs be obtained, it is irrelevant whether initially a closed peripheral edge is made, in another Work step, for example, by machining into individual Snap hook is shared, or whether the edge region of the protective element already in the shaping, for example in an injection molding machine in Shape of latching hook is designed.

By dividing into individual snap-in hooks, a preferably resilient radial bend relative to the widening of a closed circumferential edge is considerably simplified. In addition, by the resulting, opposite one closed peripheral edge reduced joining force allows a choice of material with a higher strength and possible damage to the protective element during assembly by tearing of the peripheral edge excluded.

alternative to the two embodiments described above, the Outboard part over a annular Survey and the protective element has a circumferential recess in its circumferential Have edge, which in the assembled state of the protective element on the annular Survey is snapped. This solution is particularly favorable in the case that the bearing outer part already over a corresponding annular elevation features, which one for this can be used.

Also It may be easier to manufacture in an individual case, a bearing outer part subsequently with to provide a circumferential survey, in the simplest case by Attachment of a correspondingly shaped sleeve, as a subsequent one annular Deepening, which usually involves stretching to one Lathe required.

Also in this variant it is natural possible, that the bearing outer part over a annular elevation features, and that the protective element has a plurality of latching hooks, which in the assembled state of the protective element on the annular elevation are snapped. The resulting benefits are with already executed Advantages of the locking hook solution described above identical.

Of course they are also combinations of the aforementioned embodiments or obvious modifications conceivable. For example, a paragraph from a bigger up a smaller diameter of the hub portion of the bearing outer part fulfill the function of a circumferential groove.

One Bearing with a mounted on a bearing outer part protection element can in many cases in a first layer and in a rotated by 180 ° second layer be mounted, wherein the axis for the rotation of a normal forms the axis of rotation of the bearing. Therefore, it is particularly advantageous if the bearing and the bearing outer part are designed so symmetrical to a mirror axis, which includes a right angle to the axis of rotation of the bearing that the geometric relationships on both sides of the axis the mirror image montage of two allow identical protective elements.

On this way, the bearing according to the invention with mounted bearing outer part with two identical protective elements on both sides of the bearing be provided so that during assembly in any case, a protective element covering the side which is not covered by, for example, an engine block or another mounting surface protected is. The other protective element can remain in stock and optionally also on the side facing the mounting surface of the bearing an additional Unfolding protection, if the assembly of the bearing inner ring, for example takes place on an axis with an end-side paragraph.

Even for the Case that the end face of the bearing inner ring after mounting against an area is pressed, which protrudes the bearing outer ring on all sides, impaired the extra Protective element, in particular in the embodiment according to claim 2, the function of the warehouse in any way.

There also the manufacturing and assembly costs and the weight of the protective element are low, is the security, in any case, the open side of the To protect camp by protecting a protective element usually higher, as the low cost by the use of a second protective element per Camp. Should the removal of the protective element on one side or even wished or required on both sides of the camp, so the protective element with appropriate design of the joining elements between protective element and bearing outer part simple, non-destructive and eliminated without tools.

camp are common at the factory provided with sealing rings, the term sealing ring here as each Type of bearing seal as an integral part of a bearing or as special for the seal of a bearing provided for storage accessory understand is. Certainly also such bearings, which at least on one side with a sealing ring are provided with a protective element according to the invention. This is even a particularly desirable combination because the factory seals the bearing against the seal For example, take over fine dust can, that of a protective element according to the invention depending on the structural design partially made limited can be. The protective element according to the invention protects in this case, the bearing sealing ring from influences such as coarse dust, rockfall or the jet of a high-pressure cleaner, otherwise the sealing rings of the bearing are damaged could become.

Although the protective element described hitherto in many cases, in particular when using bearings with bearing seals, already provides sufficient protection of the bearing, it may be desirable in some cases, the protective effect of another barrier between camp and order increase again world.

For this purpose points the protective element in a particular embodiment, a first Joining area, which one for it is provided, with a second joining region of a protective cap co. By this constructively simple solution it is possible if necessary after assembly of the bearing inner ring on a bearing element to unlock a preferably closed cap, which then the camp Completely from the environment.

Of course, the Joining areas here analogous to those in the subclaims 3 to 6 mentioned design variants are formed. It can but also completely other joining methods, such as adhesive bonding or plastic welding become. Although the protective cap is preferably closed to a full Encapsulation of the bearing, it is also conceivable in the protective cap to provide at least one breakthrough, for example, a shaft or axis pass to be able to.

Finally results a particularly useful application of the protective element described, if the bearing outer part a role in a traction mechanism is. Be traction mechanism often in areas with a particularly high burden of dust, dirt, Rockfall or similar used. When used in motor vehicles, they serve, for example, in shape a V-belt or toothed belt drive to drive auxiliary equipment or the drive connection between the crankshaft and to produce the camshaft of an internal combustion engine.

Just in the engine compartment of a motor vehicle, the possible loads due to dust, dirt, Rockfall and also by cleaning with, for example, a high-pressure cleaner in a motor wash very big, and the claim as possible maintenance-free longevity of storage at the same time special high. Therefore, a protective member for a bearing of the present invention can be used here be used with particular advantage.

Short description the drawings

The Invention will now be described with reference to the accompanying drawings a special embodiment explained in more detail. In this demonstrate

1 a bearing with a Lagerabdeckkappe according to the prior art,

2 another known bearing cover,

3 a special embodiment of a bearing with a protective element according to the invention in a delivery state before final assembly, and

4 the special embodiment of a bearing according to 3 after final assembly.

Full Description of the drawing

1 shows a rolling bearing 1 which is of a known closed protective cap 16 is covered. This camp 1 includes a bearing inner ring 2 and a bearing outer ring 3 , wherein on the latter a bearing outer part 4 is rotatably attached. Between the two bearing rings 2 and 3 are rolling elements 22 arranged so that these bearing rings can be rotated against each other. The bearing outer part 4 has a circumferential groove 9 in which a protective cap 16 is snapped axially with an annular protrusion. The center of the protective cap 16 lies in the mounted state on the axis of rotation 12 of the camp 1 , The rotation axis 12 of the camp 1 leads through a central opening of the bearing inner ring 2 through which, for example, a fastening screw, not shown, can be guided.

The protective cap 16 protects the camp 1 and in particular a bearing seal 17 , and can only after the assembly of the bearing inner ring 3 on a the camp 1 carrying part are snapped. If this assembly step is forgotten, the bearing seal remains 17 unprotected.

2 also shows a known embodiment of a protective cap 16 , which with a bush-like designed section 18 in the inner ring 2 a warehouse 1 is held, and the bearing seal 17 of the camp 1 as well as the bearing outer ring 3 covered. Due to a symmetrical design here are both sides of the camp 1 with protective caps 16 provided, with the assembly of the protective caps 16 before a final assembly of the bearing on a journal is possible. However, the bush-like portion reduces 18 the rigidity of the bearing of the bearing inner ring 2 on a bearing journal or other carrier element.

The 3 shows a special embodiment of a bearing 1 with a protective element according to the invention, this special bearing being symmetrical to the axis 13 is constructed.

The warehouse 1 includes a bearing inner ring 2 a bearing outer ring 3 and interposed rolling elements 22 , a bearing seal 17 and a bearing outer part 4 , which is designed here as a pressure roller, the rotationally fixed by spraying or other methods on the bearing outer ring 3 buildin is done.

The bearing outer part 4 has a radially outer surface 21 on, which is designed according to the intended use and, for example, as shown here consists of a profileless cylinder section. For other uses, the outer surface 21 However, be profiled in the radial and / or axial direction, for example, to be able to interact with V-belt, timing belt, chains or flat rhymes. A protective element 5 engages with an annular bulge at a circumferential edge 10 in a korres pondierende circumferential groove 9 of the bearing outer part 4 and is thus safe on the outer bearing part 4 attached.

Basically come for the mounting of the protective element 5 on the bearing outer part 4 Other embodiments of the joining surfaces into consideration, as described for example in the dependent claims 3 to 5. In addition, however, also attachment types such as gluing or plastic welding are possible.

Other types of fastening such as screws, rivets or other embodiments of the connection are also possible in principle and can be advantageously applied in an individual case when a transmission of torque between the protective element 5 and the bearing outer part 3 a meaning should come. However, since this is not usually the case, the shapes of the joining surfaces according to the dependent claims 3 to 5 between the protective element 5 and the bearing outer part 4 the advantage that a radial alignment of the protective element 5 to the bearing outer part 4 Not necessary before mounting and mounting is particularly easy.

Because the diameter of the central recess 7 of the protective element 5 larger than the outer diameter 8th of the bearing inner ring 2 is, can the largest axial extent of the bearing inner ring 2 over the largest axial extent of the protective element 5 extend, creating a simple determination of the bearing inner ring 2 is possible on a flat contact surface, not shown.

The protective element 5 indicates on its outside, preferably in the region of the peripheral edge 10 , a first joining area 14 on, which with a second joining area 15 a protective cap 16 interacts. This protective cap 16 is intended, after assembly of the bearing inner ring 2 on a bearing support on the freely accessible side of the bearing 1 to be set up.

Of course, the protective cap 16 be placed already for storage and transport, for example, the bore of the bearing inner ring 2 to protect against contamination and / or damage. For this purpose, also two protective caps 16 on both sides of the camp 1 to be assembled. However, these must be before a final assembly of the camp 1 be removed again.

In 4 is the special embodiment of the protection device according to 3 shown mounted. For the description of the reference numbers, reference is made to the explanations 3 directed. In 4 is clearly seen that an assembly of the bearing inner ring 2 on a bearing surface, not shown, for example by means of the bearing mounting screw 20 is easily possible even with already mounted protection element. It can also be seen that due to the lower maximum axial extent 19 of the protective element 5 opposite the largest axial extent 6 of the bearing inner ring 2 even after the determination of the camp 1 through the bearing mounting screw 20 a contact between the bearing fixing screw 20 and the protective element 5 is excluded. In this mounted position is the protective cap 16 on the protective element 5 attached, wherein the connection by an interaction of the first and second joining areas 14 and 15 will be produced.

1

camp

2

Bearing inner ring

3

Bearing outer ring

4

Bearing outer part

5

protection element

6

Largest axial extent of the bearing inner ring 2

7

Circular opening

8th

Outer diameter of the bearing inner ring 2

9

Outstanding groove

10

All-round edge

11

Ring-shaped bulge

12

Rotation axis of the bearing 1

13

mirror axis

14

first joining area

15

second joining area

16

protective cap

17

Bearing seal

18

bush-like trained section

19

Largest axial extent of the protective element 5

20

Bearing mounting bolt

21

Outside surface of the Bearing outer part

22

rolling elements

Claims (10)

Camp ( 1 ) with a bearing inner ring ( 2 ) and a surrounding outer bearing ring ( 3 ), these bearing rings ( 2 . 3 ) rotatable relative to each other and on the bearing outer ring ( 3 ) an outer bearing part ( 4 ) is arranged rotationally fixed, on which a protective element ( 5 ) is axially mountable, characterized in that the protective element ( 5 ) is substantially rotationally symmetric and a circular aperture ( 7 ) whose diameter is slightly larger than the outer diameter ( 8th ) of the bearing inner ring ( 2 ), and its center in the mounted state on the axis of rotation ( 12 ) of the warehouse ( 1 ) lies. Bearing according to claim 1, characterized in that the largest axial extension ( 6 ) of the bearing inner ring ( 2 ) greater than the maximum axial extent ( 19 ) of the protective element ( 5 ). Bearing according to claim 1 or 2, characterized in that the bearing outer part ( 4 ) via a circumferential groove ( 9 ), and that the protective element ( 5 ) a peripheral edge ( 10 ) with an annular bulge ( 11 ), which in the assembled state of the protective element ( 5 ) in the circumferential groove ( 9 ) is snapped. Bearing according to claim 3, characterized in that the bearing outer part ( 4 ) via a groove ( 9 ), and that the protective element ( 5 ) has a plurality of latching hooks, which in the assembled state of the protective element ( 5 ) in the circumferential groove ( 6 ) are snapped. Bearing according to claim 1 or 2, characterized in that the bearing outer part ( 4 ) has an annular elevation, and that the protective element ( 5 ) a circumferential recess in its peripheral edge ( 10 ), which in the assembled state of the protective element ( 5 ) is snapped onto the annular survey. Bearing according to claim 5, characterized in that the bearing outer part ( 4 ) has an annular elevation, and that the protective element ( 5 ) has a plurality of latching hook, which in the assembled state of the protective element ( 5 ) are snapped onto the annular elevation. Bearing according to one of claims 1 to 6, characterized in that the bearing ( 1 ) and the bearing outer part ( 4 ) so symmetrical to a mirror axis ( 13 ) are formed such that they are at right angles to the axis of rotation ( 12 ) of the warehouse ( 1 ) and that the geometrical relationships on both sides of the mirror axis ( 13 ) the mirror image montage of two identical protective elements ( 5 ) enable. Bearing according to one of claims 1 to 7, characterized in that the bearing ( 1 ) at least on one side with a sealing ring ( 17 ) is provided. Bearing according to one of claims 1 to 8, characterized in that the protective element ( 5 ) a first joining area ( 13 ), which is intended, with a second joining region ( 14 ) a protective cap ( 15 ) to cooperate. Bearing according to one of claims 1 to 9, characterized in that the bearing outer part ( 4 ) is formed as a role in a traction mechanism.