ARRANGEMENT FOR ANTIFRICTION BEARINGS

The present invention relates to the storage of rotating machine parts. Specifically is a of sub-control-maintaining said rotor assembly wanders slowly serving Arrangement for Rolling Bearing The subject of this invention.

Particularly wherein the changeable loaded rolling of web-manufacturing machines, particularly of machinery for manufacturing fibrous sheets, such as of paper and/or board making machine, there may be load situations come, under the minimum load where the load of the rolling bearing, in the typical case about 2% of the dynamic load-bearing capacity of the the Rolling Bearing is, remains.

In the bearing rollers roll substantially normal loading situation without sliding between the bearing rings, and is located at the bearing circumference on the opposite side a to the resulting load Range, in which the rollers not between the bearing rings pressed are. This area, however is so short that no significant deceleration the rotation speed of the roller occurs. Depending on the load it may, however, cause problems that turn, where that section, in the rollers are not in compression therebetween, such an extension undergoes, that during camp circulation to slow down the speed of rotation of the of the rollers comes. If the now slower roll again in the loaded area, so they abruptly accelerated on roll rate, what at the point of contact a shearing stress effected as a result of the sliding, which together with the growing pressure to a failure of the lubricant film and to contact of metal on metal and further to a local surface defect leads. Will thereafter the operation under normal loading, i.e. high load continued, so these minor surface damage acts as exit point for a actual fatigue damage of the bearing, would grow and, for example, in the form of local Chipping off the surface can express, that spans the entire periphery and finally continue the breakage of a bearing ring or to lead role break can.

In Following a loading situation "O-load" is to be understood under the terminus, in which the rotation speed of the roller significantly reduce pressing range can speed up and then abruptly at the beginning of the. Such O-load is typically under 2% of the dynamic load-bearing capacity of the bearing. This Limit , however, will depend on by many variables from, inter alia, from the bearing clearance, from the camp number of revolutions, from the lubricant, from the Inventory Type, from the [...], and so on. Typical, however is, that the life of the bearing significantly by O-load-situation shorten can.

In O-load-situation reduces the risk of damaging of the rolling bearing to substantially, because the rolling bodies located between inner and outer ring, such as e.g. the balls, rollers or the like, not necessarily further roll or is in its roll rate with respect to the outer ringcamp inside -and- significantly slow down, in which case on the rolling elements and/or the bearing rings a frictional load acts, as a consequence, along the rolling surface of the Rolling element and/or of the rotating bearing ring upon failure of the lubricating film to small local Damage comes, the highly detrimental effect to the life of the bearing may have an effect. Such frictional Load, it is especially then, when the rolling elements again to the speed the counter surfaces accelerate, whether as a result increase the load or because the rolling bodies at the Reach bearing circumference to a site, where a sufficient pressing between inner and outer ring prevails. The rolling elements and/or the rolling surface of the inside/outer ring of the rolling bearing can gradually Be damaged, and it may then the destruction of the Bearing come, when the operation under normal load conditions is continued.

During the aforesaid local Harm than initial place for the functions damage mechanism, enter O-load-situation and O-load-risk only under certain, usually short operating situations for the material web-manufacturing machine on, for example, when starting up, downward motion and wherein web tear, where with fall in the outer load the strain resulting of the bearing approaches zero.

Known is already, by use of plain bearings that the O-load-risk to avoid. Sliding Bearing are, however, so much more expensive than rolling bearing in the purchase, that for their use other reasons as avoiding O-load-risk to be present at the same time.

A of the challenges of this invention is, with roller bearings to eliminate or at least significantly connected O-load-risk to reduce. Furthermore, it is intended to a new with the invention, inventive step having Arrangement for Rolling bearing, with which the rotor assembly wanders slowly allows it to be held under control, provided be.

Met be the set tasks with an arrangement for rolling bearings, with which the rotor assembly wanders slowly allows it to be held under control, roughly in the shape of that the roller bearing an additional bearing is associated with, their load changed or regulated/ to a desired Value can be adjusted.

In Regard to the rules/changing/setting the load it is according to the invention displayed that the load be changed by as much with the additional bearing assembly can that the minimum load of the rolling bearing under all operating situations exceeded is. The auxiliary load can either constant or of predetermined Size or be variable so that it only to cross the minimum load is applied.

realised the additional bearing assembly can be-after the after the antifriction bearing technology or-an advantageous sliding bearing technology, because the sliding bearing in restrained space housed can be.

Under of the invention for example, with a spring or can the load on the additional bearing assembly magnetically or based on thermal expansion or with a Jack, such as for example a pneumatic power cylinder or preferably with a hydraulic jack, i.e. a Hydraulic cylinder be implemented. The regulating the load is based on the respective loading of the actual rolling bearing, and the stress may be controlled in the desired manner. For the production of the controllable force serves preferably a hydraulic cylinder, but also the other above-mentioned means for this come Purpose in question.

Besides also with this invention are the attainment of the primary objectives Advantages connected, to which only the following be said: The Size of the with the additional bearing assembly in relation to the can to effecting auxiliary load Viability the actual rolling bearing be kept low, so that the may be auxiliary camp of low construction size. Since the O-load-situation usually only occurs in certain transient operating phases, can for eliminating of the O-load-risk the only in these auxiliary camp short operating phases are loaded, wherein the power requirements and the additional friction to maintain a low, which in turn substantially reducing the servicing need and energy consumption means. One advantage is also that the auxiliary camp in the same oil chamber as the real roller bearing can be arranged, so that in conjunction with a very low Space requirements also additional Seals superfluous.

In Will be described in detail below to be advantageous if found embodiment a of the invention, without the present invention is to be limited to, with reference to the attached [...] described in detail.

It show:

<!--<figref idref="s21">- -> 1 <!--</figref>- -> a Cross-section of the storage according to the invention a roll of a web-manufacturing machine, Roll axis rotatably;

<!--<figref idref="s21">- -> 2 <!--</figref>- -> a according to the invention storage frontally seen a roll of a web-manufacturing machine;

<!--<figref idref="s22">- -> 3 <!--</figref>- -> a Cross-section of the storage according to the invention a roll of a web-manufacturing machine, Roll axis in a stationary manner.

In the embodiment of <!--<figref idref="s21">- -> 1 <!--</figref>- -> and <!--<figref idref="s21">- -> 2 <!--</figref>- -> is the rotating axis 1 of the Roll of the web-manufacturing machine via the Rolling bearings 2, 3, 4 to the frame mounted, wherein the roller bearing a at the fixed A framework as joined, non-movable outer bearing ring 2, 1 arranged on the rotating axis and with this a rotating inner race 3 as well as between the two Rings in a ring 4 comprises roller bodies arranged. The rolling bodies are made in the in <!--<figref idref="s21">- -> 1 <!--</figref>- -> and <!--<figref idref="s21">- -> 2 <!--</figref>- -> shown Embodiment of spheres, but they could also from cylindrical or conical or barrel-shaped or sleeve-like or generally consist of rotationally symmetrical elements.

It it should be stressed here that the present invention storage concepts can be applied also on, in which the axis inner race of the bearing are stationary and the member provided thereon and the outer ring of the bearing rotates. Here, then against the to the rotating outer ring of the sliding face, which is a on the stationary auxiliary camp Inner ring arranged sliding shoe pressed.

According to the general Principle of the present invention is an additional bearing roller bearings fastened 8, 9, 10, 11 associated with, their load to a desired Value set or of the respective loading situation corresponding to can be regulated. This controllable additional bearing assembly can if required a such auxiliary load are generated that the dynamic minimum load the actual Antifriction bearing 2, 3, 4 of the Axis 1 exceeded is.

As from <!--<figref idref="s21">- -> 1 <!--</figref>- -> clearer about is according to the invention additional bearing assembly 8, 9, 10, 11 in axial direction between the rolling bearing 2 so, 3,4 of the Axis with the axis 1 and the rotating body, for example, a roller, arranged that it is immediately adjacent to the roller bearing the axis is located. The additional bearing assembly can also on the other Side of the actual rolling bearing or, for example, symmetrically, on both sides of the actual rolling bearing be arranged.

As in <!--<figref idref="s21">- -> 2 <!--</figref>- -> dashed is illustrated, the generated Additional bearing a load, whose line of action F symmetrically through the axis 1 and the rolling bearing 2, 3, 4 of the Axis runs. This line of action runs further most preferably perpendicular to the central axis of rotation of the axis. The auxiliary load may either to be generated with the additional bearing assembly the same direction as the normal resultant load on the actual rolling bearing have deviate or of their direction.

Under of the invention the additional bearing assembly after the can-after the antifriction bearing technology or-an advantageous sliding bearing technology be implemented.

In the embodiment of <!--<figref idref="s21">- -> 1 <!--</figref>- -> and <!--<figref idref="s21">- -> 2 <!--</figref>- -> is on the additional bearing assembly sliding bearing basis realized. Here auxiliary camp a comprises the 1 arranged on the rotating axis, with the axis rotating inner frame or ring part 6 5 with a sliding surface, the more in a ring and symmetrically at regular mutual Intervals 10mit cavities arranged in each one fitted, movable piston part 8 has. Here forms each of said cavities a cylinder part 9 together with its piston part, from the, of a pressurized medium loaded, the piston part extends radially inwardly against the sliding surface, wherein the piston portion 8, when bound to the sliding surface rests on the sliding surface and slides, works as a bearing shoe.

The Cavity 8 form 10 and the bearing shoe therein such a jack, by a pressure medium actuated, i.e. is driven, its delivery line 11 via a not by the piston part with the rotating part 8 with its Back Side closed, above cavity located 10, the Working space of the power cylinder is in communication.

The Bearing shoe 8, by using a known technique function as a hydrodynamic or in the form of a hydrostatic shoe. In the latter case, to direct pressure oil into the pocket between shoe and mating surface 6. The Pressure Oil for example, a matching source can be removed, or it can have its own pump arranged in connection with the storage be, the the oil for example, from the oil circuit takes out of the rolling bearing and it under pressure into the pocket transported, from where it in the oil circuit of the rolling bearing flowing back.

To of the above-mentioned sliding surface 6 is note that it not strictly necessary to form the slide face is, on the axle 5 to arrange a special inner frame part 1, but that also the outer surface of the Axis 1 as a sliding surface the support shoe can serve 8.

The Cylinder part 9 and the bearing shoe 8 form internally within the container a jack is driven by a pressure medium, its delivery line 11 with the 8 with its rear side closed by the piston part, above of the piston part 10 of the power cylinder located working space in communication. The type of the power cylinder is from the point of view the functioning of the invention, does not make the most essential element, and in this way, because according to the invention the regulation of the load on the additional bearing assembly according to the invention with a mating jack, such as for example a pneumatic power cylinder or, an advantageous, a hydraulic jack, i.e. a hydraulic cylinder be implemented. Instead with a jack may, when present invention the load where necessary by solid or adjustable spring loading or by magnetic load on thermal expansion or by -based load be implemented.

Zum Sealing of the working space 10 has the annular side wall of the piston part, the 8 forms the bearing shoe, a piston seal 7. In the in <!--<figref idref="s21">- -> 1 <!--</figref>- -> shown embodiment, there is a piston seal advantageously of an elastic material. An even better seal in the direction of movement of the piston part To to achieve, can also a plurality of piston seals are mounted; in the example in <!--<figref idref="s21">- -> 1 <!--</figref>- -> is only present a piston seal.

In the embodiment of <!--<figref idref="s21">- -> 1 <!--</figref>- -> are the actual rolling bearing 2, 3, 4 and according to the invention additional bearing assembly 5, 8, 9 in the same oil chamber arranged, such that for the additional bearing assembly no additional Seals are necessary.

In <!--<figref idref="s22">- -> 3 <!--</figref>- -> is storage concept of another embodiment of the invention the shown. In this embodiment are the axis 1' and the 3 inner race fixedly disposed thereon, during the Bearing outer race 2 rotates. The on the axle mounted rotating body, for example, a roll shell, to the rotating outer ring is here of the bearing assembled. The rolling bodies 4 have by the embodiment of <!--<figref idref="s22">- -> 3 <!--</figref>- -> of spheres, but they could also from cylindrical or conical or barrel or sleeve-like or generally consist of rotationally symmetrical elements.

According to the general Principle of this invention is in connection with the rolling bearing 2, 3, 4 a Additional bearing assembly 8 ', 9', 10 ', 11' arranged, their load to a desired Value set or of the respective loading situation ent [...] speaking can be regulated. This controllable additional bearing assembly can if required a such auxiliary load are generated that the dynamic minimum load the actual Antifriction bearing 2, 3, 4 of the Axis 1' exceeded is.

As Sliding Surface in the additional bearing assembly 8 ', 9', 10 ', 11' serves now the Inner surface 6' of the together with the rotating outer ring rotating inner frame-or ring part 9' or the inner surface of the rotating roll jacket, against which the piston part 8', to the stationary axle 1' or on the fixed axis located on the frame part 5' arranged is, radially outwardly is pressed. The piston part functions as a sliding shoe so the additional bearing assembly.

As in the embodiment in <!--<figref idref="s21">- -> 1 <!--</figref>- -> and <!--<figref idref="s21">- -> 2 <!--</figref>- -> is also here the additional bearing assembly 8 ', 9', 10 ', 11' after the sliding bearing technology realized. The essential difference is that the additional bearing assembly a on the non-rotating axis 1' arranged, not rotating inner frame or ring part 5' has, at the in a ring-like configuration and symmetrically at regular mutual Intervals Cavities 10' with a respective fitted movable piston part 8 'are formed, wherein the cavity 10' and the piston part together are each a cylinder part 9' form. With a printing medium acted upon, the piston part from the cavity and can then as the bearing shoe, located on the sliding surface 6' is supported and slides on this, act. The cavity 10' and in this existing bearing shoe 8' thus form a jack, is driven by a pressure medium, whose delivery line 11' on the non-rotating spindle 1' with the from the back of the piston part 8' closed, underlying cavity 10', the working space of the power cylinder, in communication. Zur sealing of the working space 10' it is appropriate, that said annular Side wall of the the shoe forming piston part 8' with at least a piston seal is provided.

In the embodiments of <!--<figref idref="s21">- -> 1 <!--</figref>- ->, <!--<figref idref="s21">- -> 2 <!--</figref>- -> and <!--<figref idref="s22">- -> 3 <!--</figref>- -> is the From the point of view of the operation of the invention of the power cylinder type viewed not the most essential element, and in this way, because according to the invention the regulation of the load on the additional bearing assembly according to the invention with a mating jack, such as for example a pneumatic power cylinder or, an advantageous, a hydraulic jack, i.e. a Hydraulic cylinder be implemented. Instead with a jack can also in the present invention the load by a constant or adjustable spring loading or by magnetic load or optionally by to thermal expansion -based load be implemented.

The Bearing shoe 8,8 ' can using a known technique as a hydrodynamic or in the form of a hydrostatic shoe work. In the latter case, in the pocket between shoe and mating surface 6,6 ' to direct pressure oil. The Pressure Oil either a matching source can be removed, or it can have its own pump arranged in connection with the storage be, the the oil for example, from the oil circuit of the rolling bearing transported and delivered under pressure into the pocket, from where it in the oil circuit flowing back of the rolling bearing.

The Invention has been previously described as an example only, attempt to make it but by no means be limited to such a single example. Therefore, within the framework of the inventive defined in claims Idea many alternative solutions, variations and equivalent functional other Solutions possible.

Thus is therefore also the case in question that both the axis and the body mounted thereto, for example, a roll shell, are rotatable. This could then the Urging the slide shoe against the sliding surface, for example, via a annular channel formed on the frame part on the rotating axis/arrival.