DE102005055618A1 - Cage for roll bodies has at least one web made so that contact between it and the roll body in longitudinal direction of web is interrupted at least once - Google Patents

Abstract

The cage (1) has two edging strips (2, 3) parallel to each other, and several parallel webs (5) between them and connected to both of them. Roll bodies can be fitted in pockets (9) between the webs. At least one of the webs is made so that contact between it and the roll body in the longitudinal direction of the web is interrupted at least once.

Description

Territory of invention

The The invention relates to a cage for rolling elements and in particular a Cage, the at radial rolling bearings Application finds. In this case, the invention with reference to describes a cylindrical roller bearing, which has an outer ring and / or having an inner ring and guided between these rings rolling elements. Such cages for rolling elements are known from the prior art. They are in rolling bearings arranged between the inner ring and the outer ring and serve the rolling elements, for example To hold cylindrical rollers in certain positions.

These cages have two shelves in the prior art, which limit the individual rolling elements in the longitudinal direction. In addition, a plurality of webs is arranged between the rims, which can be touched by the rolling elements in their circumferential direction. From the DE 196 12 307 A1 a radial rolling bearing is known, which has such a cage. The known from the prior art cages for rolling elements can be produced inexpensively and work satisfactorily. Nevertheless, there is a need to improve the known cages, in particular with regard to the guidance of the individual rolling elements and the lubricant supply.

Of the The present invention is therefore based on the object, a Wälzkörperkäfig for disposal to provide, which allows a better lubricant supply of the bearing. In addition, an improved roller guide should be achieved. This is inventively the subject of the independent Achieved. Advantageous embodiments and developments are the subject of the dependent claims.

Of the inventive cage for rolling elements has a first board, as well as a second board leading to the first Board is essentially parallel. Furthermore, a variety of substantially mutually parallel webs provided between arranged on the first board and the second board and with both shelves are connected. It can arranged in pockets between the webs rolling elements become. At least according to the invention a bridge designed in such a way that a contact between this web and the rolling body in the longitudinal direction of this web at least once interrupted. Preferably, the shelves and the webs executed in one piece.

As stated above touched while the operation of the rolling elements at least at times the mentioned Bag bounding webs. This contact or contact takes place in the prior art substantially along the full longitudinal direction of these bridges. By providing interruptions to this contact can preferred in those areas where the interruptions contact occurs, the rolling element lubricant supplied become. The improvement of the lubricant throughput in turn leads to a reduction in temperature during operation of the bearing and thus to a reduced susceptibility to wear.

Besides may be due to the broken contact, especially in one area of pocket corners of pockets formed by the webs and shelves, realized an enlarged pocket corner radius and thereby reduces voltage spikes in the enlarged pocket corner radius become.

Under two parallel shelves is understood to mean that the planes, in which the two shelves extend, substantially parallel to each other, d. H. are laterally offset from each other in parallel.

at the ribs are preferably annular bodies, between which the extend said webs. The webs extend between the two Borden so that they are in the circumferential direction of the shelves arranged and thus are substantially parallel to each other. By the shelves or inner surfaces the shelves on the one hand and two adjacent bars are the Formed pockets in which arranged the rolling elements can be.

Under an interrupted contact between the web and the rolling element is understood that this contact essentially over the entire lifetime of the cage is interrupted. Preferably follows an area of the web, in which at least temporary contact with the rolling elements, longitudinal of the land a second substantially contactless area and on this at least a second contact area. It can too several contact areas and non-contacting areas one behind the other be provided.

In a further preferred embodiment, at least one web is designed such that the contact between this web and the rolling body is possible substantially along the entire height of this web. In this case, the height of the web is understood as the direction by which the width of the pockets formed by the webs and the shelves is determined in the radial direction of the cage. By the execution of the web such that the rolling body substantially along the entire height thereof can be brought into contact is achieved, it is achieved that along the entire height of the web, the contact between this web and the rolling elements in the longitudinal direction of the web is interrupted at least once.

Preferably are provided on at least one web contact means in contact stand with the rolling element, wherein these contact means are arranged such that the contact longitudinal the bridge is interrupted at least once. With these contact agents These can be raised areas to curved or angled surfaces of the Stegs and the like act.

Preferably At least one contact means extends substantially over the entire height of the footbridge. In this way, in turn, that essentially achieves along the entire height the web of contact between the web and the rolling element in longitudinal direction the bridge is interrupted at least once.

Preferably is at least one contact means on a rolling body surface facing the Footbridge arranged. Thus, the rolling element is also with this contact means or the outer surface of this Contact agent in contact.

at a further preferred embodiment are each two contact means on the rolling bodies facing surfaces of a Variety of webs arranged. This means that to those Surfaces, those of the above Each bag facing two contact means are arranged. In this way, the rolling element is in radial direction respectively with two contact means of a web and also with two other contact means of a web adjacent to this Stegs in contact. Preferably, two bars are on each bar Contact means arranged on the rolling elements facing surfaces. These contact means are opposite to the surface the webs a predetermined height and thus are raised above these surfaces. In a further preferred embodiment, the corner radius the pockets formed by the webs and shelves of this height of the contact means dependent. Specifically, the corner radius of the pockets is chosen so that no contact with the Rolling elements in the corners of these bags occurs. This means that at one greater height of the contact means across from the surface Also, the corner radius of the pockets can be made larger, causing voltage peaks, especially in the mentioned corner areas, counteracted can.

at a further preferred embodiment at least one contact means has a substantially rectangular shape on. This rectangular The shape extends from a lower edge of the web to a Top edge of the bridge d. H. above the essentially complete corner height. The Width of the contact agent in the longitudinal direction the bridge is chosen so that there is enough free space between the contact means to achieve a satisfactory lubrication of the rolling elements.

at a further preferred embodiment is a surface facing the rolling element at least a contact means substantially flat. This surface is especially for an on-board roller bearing suitable. In a further preferred embodiment, one of the rolling bodies facing surface at least one contact means at least partially curved or angulated. This embodiment is especially for a rolling body guided rolling bearing suitable. Here is the curvature this contact means particularly preferably adapted to the curvature of the rolling element.

at a further preferred embodiment is at least one bridge and are preferred at all webs Holding means, in particular retaining lugs and / or projections, arranged, at least the rolling elements time wise towards the Keep the cage.

Out The rolling element cages known from the prior art often have a large rolling element slack on, d. H. the rolling elements fall inside the bag by gravity down. The mentioned retaining lugs cause that at least during the initial assembly the rolling elements against the Caged become. Therefore, the retaining lugs are particularly preferably filigree or deformable, so after mounting the bearing after a few bearing rotations sets a normal operating clearance between the rolling elements and the cage. This means that the retaining lugs after a few turns of the Rolling elements like that Worn out or deformed, giving it another movement the rolling elements in no longer hinder the bags.

Especially preferred are the holding means, in particular the retaining lugs and / or the projections, arranged on the contact means. For example, to the Contact means or areas of the same as the lower areas the contact means holding means may be provided. It would be, however also possible, to arrange the holding means in areas of the web outside of the contact means.

Preferably, the projections extend in the longitudinal direction of the cage or in the longitudinal direction of the webs. Furthermore, it can preferably be provided that the retaining lug extends substantially perpendicular to the longitudinal direction of the web and / or in the vicinity or on the projection is arranged.

at a further preferred embodiment is the cage made of a plastic. Basically, the present Invention, however, also on cages made of metal.

at a further preferred embodiment are in the gaps formed between the webs respectively Arranged rolling elements. These means that between the Borden a predetermined number of webs extends and an equal number of rolling elements respectively is arranged between two adjacent webs.

at a further preferred embodiment has at least one web and preferably have all webs along their Longitudinal recesses on. By this Stegausnehmung on the one hand, the elasticity of the web elevated and on the other hand you can uniform cross sections and thus a reduced residual stress can be achieved. Besides The recesses also serve to reduce weight.

The Recesses are preferably on the radially outer surfaces of the Webs arranged.

at a further preferred embodiment at least one board is ribbed. This ribbing is special preferably on an outer surface of the Bords provided. By this ribbing is also the stiffness of the board and thus of the entire cage increased. In addition, the Ribs or the spaces between them associated with these ribs Contribute to the ribs to reduce weight of the bearing. at a further preferred embodiment is in at least one board a substantially circular groove arranged. Also this circular Groove is preferably provided on an outer surface of the board. at a further preferred embodiment Such a groove is provided in both Borden preferably in their outer surfaces. Also through this groove can increase the stiffness as well a weight reduction can be achieved.

Preferably if the warehouse is an on-board warehouse. In this case is, as stated above, the contact means with a Wesentli chen flat surface executed. In another embodiment If the bearing is a rolling body-guided bearing. In this case is the contact surface the contact means performed substantially curved.

The The present invention is further directed to a radial rolling bearing having at least one outer ring an inner ring and a plurality of between the outer ring and the inner ring arranged rolling elements, being a cage the type described above is provided in the pockets of which the rolling elements are guided.

Preferably are the rolling elements as Rollers, in particular cylindrical rollers, executed.

Further Advantages and embodiments emerge from the attached Drawing:

These shows:

1 a partial view of a cage according to the invention; and

2 a partial view of a cage according to the invention in a further embodiment.

1 shows a cage according to the invention 1 , In this case, the reference numeral refers 2 on a first board and the reference number 3 on a second board. These two shelves are designed like a ring and parallel to each other. Between the two shelves 2 and 3 extends a variety of webs 5 substantially perpendicular to the plane of the shelves. Here are the shelves 2 . 3 formed integrally with these webs. The individual bridges 5 are arranged substantially uniformly in the circumferential direction of the cage.

The reference number 8th refers to a contact means that on a (not shown) rolling elements, such as a roller, in particular a cylindrical roller, facing surface 5a of the footbridge 5 is arranged. At the in 1 shown embodiment are on all surfaces 5a arranged two contact means. These contact agents 8th are substantially rectangular in shape and extend, as in 1 shown along the entire height H of the individual bars 5 ,

Between the two contact agents 8a . 8b the contact between the rolling element and the web is interrupted. Similarly, in the areas of the webs, the left of the left contact means 8b or right of the right contact means 8a are shown, the contact between the (not shown) rolling elements and the web 5 interrupted. As stated above, this interruption of contact achieves a better supply of lubricant. Also, the roller guide is improved in the unloaded zone of the camp.

The webs indicate at the in 1 shown embodiment, a radially inwardly radially outwardly increasing width B on. The real one bag 9 , each with two bars 5 and the two shelves 2 and 3 is formed, is due to the design of the webs 5 formed such that their side wheels are substantially perpendicular to each other.

In a further embodiment, the webs themselves are formed substantially cuboid. In this embodiment, the pockets widen 9 from the inside out.

The reference number 12 refers to retaining means or retaining lugs, which prevent the rolling elements from falling out of the pockets during the assembly process. These retaining lugs 12 wear off quickly during use of the warehouse. The retaining lugs 12 are on further holding means, in this case projections 13 , provided in turn to the contact means 8th are arranged. The projections 13 thus also fulfill the function of a rolling bearing inner holder.

The projections 13 extend in the longitudinal direction of the cage or in the longitudinal direction of the webs 5 , They prevent falling out of the rolling elements and also fulfill a snap function when mounting the rolling elements. Depending on the type of guide of the cage, ie inboard, outboard or rolling body-guided cage, the snap-action function is conceivable from the inside as well as from the outside of the cage. This holding function is in contrast to the retaining lug 12 designed to last.

The retaining lugs 12 extend substantially perpendicular to the longitudinal direction of the webs. Through these retaining lugs 12 the initial installation and the blind assembly is facilitated. This bracket is designed so that it works in the operation of the camp.

Accordingly, it would also be possible, the projections 13 at the top of the contact means 8th to arrange and the holding means according to the upper edge of the contact means. In this case, the holding means act as Wälzkörperaußenhalterung.

The reference number 14 refers to an annular groove in the outer surfaces 3a of the board 3 is provided.

The reference number 7 refers to a corner area of the bag 9 , This corner region is rounded, wherein the radius of curvature of this rounding to the degree of protrusion of the respective contact means 8th opposite the jetty 5 is adjusted. More specifically, the radius of curvature is in the corner areas 7 such that the rolling element (not shown) does not contact this corner area. The reference number 6 refers to a arranged in the individual webs recess 6 , This excerpt 6 serves, as mentioned above, to improve the elasticity of the web. In addition, the residual stresses due to the more uniform cross sections are reduced.

2 shows a further embodiment of the bearing cage according to the invention. The main difference to the in 1 embodiment shown is that in the in 2 shown embodiment, in the two Borden no annular grooves are arranged, but instead ribbing 11 , These ribs 11 serve on the one hand, as mentioned above, the weight reduction and on the other hand, an increase in the elasticity of the board.

All Features disclosed in the application documents are considered to be essential to the invention as long as they are individually or in combination with respect to State of the art are new.

1

Cage

2

first shelf

3

second shelf

3a

Outside surface of the Bords

5

web

5a

the rolling body facing surface of the web 5

6

recess of the footbridge

7

corner

8th, 8a, 8b

contact means

9

bag

11

ribbing

12

holding means

13

head Start

14

ring groove

H

Height of the jetty

B

width of the footbridge

Claims (24)

Cage for rolling elements with a first board ( 2 ), a second to the first board ( 2 ) essentially parallel board ( 3 ), a plurality of substantially parallel webs ( 5 ) between the first board ( 2 ) and the second board ( 3 ) and with two Borden ( 2 . 3 ), in pockets ( 9 ) between the bridges ( 5 ) Rolling elements can be arranged, characterized in that at least one web ( 5 ) is designed such that a contact between this web ( 5 ) and the rolling element is interrupted at least once in the longitudinal direction of this web. Cage according to claim 1, characterized in that at least one web ( 5 ) is designed such that the contact between this web ( 5 ) and the rolling element substantially along the entire height of this web ( 5 ) can occur. Cage according to at least one of the preceding claims, characterized in that at least one web contact means ( 8th ) are provided, which are in contact with the rolling elements, wherein these contact means are arranged such that the contact between the web ( 5 ) and the rolling element is interrupted at least once in the longitudinal direction of the web. Cage according to claim 3, characterized in that at least one contact means ( 8th ) extends substantially over the entire height of the web. Cage according to at least one of the preceding claims 3-4, characterized in that at least one contact means ( 8th ) on a surface facing the rolling element ( 5a ) of the bridge ( 5 ) is arranged. Cage according to claim 5, characterized in that in each case two contact means ( 8th ) on the rolling bodies facing surfaces ( 5a ) a plurality of webs ( 5 ) are arranged. Cage according to at least one of the preceding claims 5-6, characterized in that the contact means ( 8th ) with respect to the rolling elements facing surfaces ( 5a ) are sublime. Cage according to at least one of the preceding claims 3-7, characterized in that at least one contact means ( 8th ) has a substantially rectangular shape. Cage according to at least one of the preceding claims 5-8, characterized in that a rolling body facing surface of at least one contact means ( 8th ) is substantially flat. Cage according to at least one of the preceding claims 3-8, characterized in that a rolling body facing surface of at least one contact means ( 8th ) is at least partially curved and / or angled. Cage according to at least one of the preceding claims, characterized in that at least one web ( 5 ) and preferably at all webs holding means, in particular a holding nose ( 12 ) and / or a lead ( 13 ) are arranged, which hold the rolling elements at least temporarily against the cage. Cage according to claim 11, that the holding means, in particular the retaining lugs ( 12 ), are performed filigree or deformable, that after a few bearing rotations a normal operating clearance between the rolling elements and the cage adjusts. Cage according to at least one of claims 11-12, characterized in that the holding means ( 12 . 13 ) at the contact means ( 8th ) are arranged. Cage according to at least one of claims 11-13, characterized in that the retaining lug ( 12 ) in the vicinity or at the projection ( 13 ) is arranged. Cage at least one of the preceding claims, characterized that the cage made of a plastic. Cage according to at least one of the preceding claims, characterized in that in between the webs ( 5 ) formed spaces each rolling elements are arranged. Cage according to at least one of the preceding claims, characterized in that at least one web ( 5 ) and preferably all webs ( 5 ) along its longitudinal recesses ( 6 ) exhibit. Cage according to claim 17, characterized in that the recesses ( 6 ) on a radial outer surface of the webs ( 5 ) are arranged. Cage according to at least one of the preceding claims, characterized in that at least one board ( 2 . 3 ) is ribbed. Cage according to at least one of the preceding claims, characterized in that in at least one board ( 2 . 3 ) is arranged a substantially circular groove. radial bearings with at least one outer ring an inner ring and a plurality of between the outer ring and the inner ring arranged rolling elements and a cage according to at least one of the preceding claims. radial bearings according to claim 21, characterized in that the rolling bodies as Rollers, in particular cylindrical rollers, are formed. radial bearings according to at least one of the preceding claims, characterized that the rolling bearing an on-board rolling bearing is. Radial rolling bearing according to at least one of the preceding claims, characterized in that the rolling bearing a wälzkörpergeführ tes rolling bearing is.