WO2015078461A1

WO2015078461A1 - Planetary roller bearing

Info

Publication number: WO2015078461A1
Application number: PCT/DE2014/200612
Authority: WO
Inventors: Thomas Stahl; Ulrike Weisskopf; Andreas Staudigel; Sascha Moser
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2013-11-28
Filing date: 2014-10-31
Publication date: 2015-06-04
Also published as: DE102013224462A1

Abstract

The invention relates to a planetary roller bearing (1), comprising an outer ring (2) having a groove-like profile, at least sectionally, on the inner peripheral side, comprising an inner ring (3) having a groove-like profile, at least sectionally, on the outer peripheral side, and comprising a number of rolling bodies (5), which are arranged in a rolling body receiving space (4) formed between the outer ring (2) and the inner ring (3), and which are groove-like profiled on the outside, at least sectionally. In the outer ring (2) and/or the inner ring (3), at least one lubricant supply channel (10) for supplying lubricants to the rolling body receiving space (4) is formed.

Description

Description of the invention Planetary rolling bearing

description

Field of the invention

The invention relates to a planetary roller bearing, comprising an inner peripheral side at least partially grooved profile outer ring, an ßenumfangsseitig at least partially groove-like profiled inner ring and a number of arranged in a formed between the outer ring and the inner ring Wälzkörperaufnahmeraum, on the outside at least partially groove-like profiled rolling elements.

Background of the invention

Such Planetenwälzlager, which are sometimes referred to as a roller bearing, are known per se and serve to accommodate axial and possibly additional radial forces. An essential feature of corresponding planetary roller bearings is the engagement of a profiling, which is formed at least partially on the outer side of the rolling element, into profiled portions of the outer ring or inner ring, at least in sections, on the inner peripheral side or outer peripheral side. It is customary that corresponding planetary roller bearings are provided with cages, which cages serve the leadership or storage of the rolling elements.

The problem with such planetary roller bearings may be their lubrication, ie the introduction of a certain amount of lubricant in the Wälzkörperaufnahmeraum formed between the outer ring and the inner ring. INS special is a relubrication, which is regularly required due to a made due to the high stress during operation degradation of the lubricant, difficult or cumbersome. This is due, in particular, to the fact that due to the largely closed design of corresponding planetary roller bearings due to corresponding cages for guiding or supporting the rolling elements, an axial introduction of lubricant into the rolling body receiving space is (only) difficult.

Summary of the invention

The invention has for its object to provide an easy to lubricate or easy to be lubricated planetary roller bearing.

The object is achieved by a planetary roller bearing of the aforementioned type, which according to the invention is characterized in that in the outer ring and / or the inner ring at least one Schmiermittelzuführkanal is formed for supplying lubricant into the Wälzkörperaufnahmeraum.

The planetary roller bearing according to the invention, which can also be referred to as a roller-roller bearing, usually comprises an outer ring, an inner ring and a number of rolling elements rolling in a rolling element receiving space formed between the outer ring and the inner ring. The outer ring is at least partially profiled on the inner peripheral side, ie at least partially profiled, the inner ring is at least partially profiled on the outer peripheral side, ie at least partially provided with a groove-like profiling, the rolling elements are on the outside, ie in particular in the area of their Wälzbereiche - or Wälzflächen, profiled at least in sections, ie at least partially provided with a groove-like profiling. The groove-like profiling of the rolling elements typically engages in the groove-like profiling of the outer ring and the inner ring. The planetary roller bearing according to the invention is now provided on the outer ring and / or on the inner ring with at least one lubricant feed channel for supplying lubricant, ie for example lubricating grease and / or lubricating oil, into the rolling body receiving space. Consequently, the outer ring and / or the inner ring has at least one lubricant feed channel in the sense of an inner channel-like structure or is penetrated by at least one corresponding lubricant feed channel, via which a supply of lubricant into the Wälzkörperaufnahmeraum for the purpose of lubrication or relubrication of Planetenwälzlagers is possible ,

Thus, if an outer ring is provided with a corresponding lubricant supply channel, the lubricant supply channel generally extends from an outside of the outer ring that does not directly bound the Wälzkörperaufnahmeraum, d. H. in particular the outer diameter or outer circumference or an axial edge of the outer ring, up to the Wälzkörperaufnahmeraum directly limiting inner diameter or inner circumference of the outer ring. Accordingly, if an inner ring is provided with a corresponding lubricant supply channel, the lubricant supply channel generally extends from an outer side of the inner ring which does not directly delimit the Wälzkörperaufnah- meraum, d. H. in particular the inner diameter or inner circumference or an axial edge of the inner ring, up to the Wälzkörperaufnahmeraum directly limiting outer diameter or outer circumference of the inner ring. The lubrication or relubrication of the planetary roller bearing is therefore, in particular in the case in which the planetary roller bearing with corresponding cages for guiding or supporting the rolling elements, d. H. so-called rolling bearing cages, is provided, which largely complete the planetary roller bearing to the outside, greatly simplified.

The planetary roller bearing according to the invention associated outer ring or inner ring can of course have several corresponding Schmiermittelzuführkanäle which uniformly or non-uniformly axially, radially or arranged circumferentially distributed over the outer ring or inner ring.

In the context of the invention, groove-like profiling generally refers to any type of regular or irregular surface profiling of the inner diameter or inner circumference of the outer ring, the outer diameter or outer circumference of the inner ring and the outer sides, ie in particular the Wälzbereiche - or Wälzflächen, the rolling elements. The respective surface profilings are typically matched to one another such that engagement of the rolling body-side surface profiling in the outer or inner ring-side surface profilings is possible. Under a groove-like profiling fall, for example, thread or tooth-like surface profiling. In the simplest case, the lubricant supply channel may be a bore passing radially through the outer ring and / or the inner ring. The at least one lubricant supply channel can therefore extend radially through the outer ring and / or inner ring. Preferably, the Schmiermittelzuführkanal extends centrally relative to the axial dimensions of the outer ring and / or the inner ring through the outer ring or the inner ring. The at least one, radially extending through the outer ring and / or the inner ring Schmiermittelzuführkanal is therefore axially considered in a central or centric position, ie formed in a central or central region of the outer ring and / or the inner ring. As a result, a central or centric lubrication or relubrication of the planetary roller bearing is possible, which z. B. is advantageous in view of a uniform distribution of the lubricant within the rolling body receiving space. Of course, it is also possible to provide corresponding axially axially extending or eccentrically provided lubricant feed channels extending radially through the outer ring or the inner ring. It is expediently possible to form on the outer diameter or outer circumference of the outer ring at least one circumferentially at least partially circumferential groove into which the at least one lubricant feed channel opens radially and / or at least one circumferentially at least partially circumferential groove is formed on the inner diameter or inner circumference of the inner ring which at least one lubricant feed channel opens radially. The provision of a corresponding groove is particularly advantageous from two perspectives. Firstly, the groove can be used as a distributor channel, in which lubricant to be introduced into the planetary roller bearing can be distributed circumferentially, before it reaches the rolling body receiving space via respective lubricant supply channels which are arranged distributed circumferentially and radially into the groove. Thus, it is possible due to the formation of a corresponding groove to introduce lubricant circumferentially only at a certain point in the groove to distribute circumferentially in the groove and distributed over circumferentially distributed, radially opening into the groove Schmiermittelzuführkanäle in the Wälzkörperaufnahmeraum. Second, the groove facilitates attachment of a lubricant supply device, such. B. a grease nipple of a Planetenwälzlager receiving housing part, to the outer ring or inner ring. A corresponding groove does not necessarily have to be circumferentially formed circumferentially. Therefore, a plurality of grooves each extending over a fraction of a circumference may be provided circumferentially. Of course, viewed axially, a plurality of grooves may be provided side by side.

Expediently, it may further be provided that no groove-like profiling is provided in the area of the inner diameter or inner circumference of the outer ring into which the lubricant feed channel opens, and / or none in the area of the outer diameter or outer circumference of the inner ring into which the lubricant feed channel opens groove-like profiling is provided. Correspondingly, the respective region of the inner circumference of the outer ring or of the outer circumference of the inner ring into which the lubricant supply channel leads opens, facing the rolling body receiving space. cut not provided with an appropriate profiling. By means of the space formed by the respective recess of the inner circumference of the outer ring and the outer circumference of the inner ring with a corresponding profiling space integrated in the planetary roller bearing lubricant or lubricant reservoir can be realized, which additionally improves the lubrication of the planetary roller bearing.

A corresponding lubricant supply channel does not necessarily have to extend exclusively radially through the outer ring or inner ring. It is only essential that the Schmiermittelzuführkanal extends between a corresponding Wälzkörperaufnahmeraum not immediately limiting outer side of the outer ring or inner ring and the Wälzkörperaufnahmeraum directly limiting inner diameter or inner circumference of the outer ring respectively the Wälzkörperaufnahmeraum directly limiting outer diameter or outer circumference of the inner ring.

For this reason, it is possible, for example, for at least one lubricant supply channel, viewed in cross-section, to extend obliquely and thus inclined with respect to a central bearing (symmetry) axis through the outer ring or the inner ring. A lubricant supply channel may extend obliquely with respect to an outer ring from the outer circumference or an axial edge thereof to the inner circumference of the outer ring. Relative to an inner ring, a lubricant supply channel may extend obliquely extending from the inner circumference thereof or an axial edge up to the outer circumference of the inner ring. If a plurality of cross-section considered inclined Schmiermittelzuführkanäle are provided, the inclination angle with respect to the central bearing (symmetry) axis may be the same or different.

Furthermore, it is therefore also possible for at least one lubricant feed channel to have at least two differently aligned, overlapping lubricant feed channel sections, at least one first Schmiermittelzuführkanalabschnitt axially through the outer ring and / or inner ring and at least a second Schmiermittelzuführkanalabschnitte radially through the outer ring and / or inner ring extends. A lubricant supply channel may accordingly be subdivided into at least two differently oriented lubricant supply channel sections, which communicate with each other in such a way that a lubricant supply channel results which differs from a corresponding outside of the outer ring or inner ring which does not directly bound the roller body receiving space Wälzkörperaufnahmeraum immediately limiting inner circumference of the outer ring or outer circumference of the inner ring extends.

It is conceivable that at least one circumferentially at least partially circumferential groove is formed at an axial edge of the outer ring into which the at least one first Schmiermittelzuführkanalabschnitt axi al opens and / or formed on an axial edge of the inner ring at least one circumferentially at least partially circumferential groove is, in which the at least one first Schmiermittelzuführkanalabschnitt opens axially. Here, the above statements in connection with the formation of a corresponding circumferentially at least partially circumferential groove in a radially extending through the outer ring or inner ring Schmiermittelzuführkanal analog.

BRIEF DESCRIPTION OF THE DRAWING An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it:

Figures 1 - 4 each a schematic diagram of a planetary roller bearing according to an embodiment of the invention; and

Figure 5 shows an outer ring of a Planetenwälzlagers according to an embodiment of the invention. Detailed description of the drawing

FIGS. 1-4 each show a schematic diagram of a planetary roller bearing 1 according to an embodiment of the invention. It is in the figures 1 to 4 each show a cross section of a planetary roller bearing 1 sectional views. The central bearing (symmetry) axis is marked A in all figures.

As can be seen, the planetary rolling bearing 1, which can also be referred to as a grooved roller bearing, comprises an outer ring 2, an inner ring 3 and rolling elements 5 arranged in a rolling body receiving space 4 formed between the outer ring 2 and the inner ring 3, typically barrel-shaped or cylindrical.

As can be seen, the outer ring 2 is provided with an inner circumferential groove-like profiling 6 and the inner ring 3 is provided with an outer peripheral groove-like profiling 7. The rolling elements 5 are in the region of their outsides, d. H. in particular in the region of their lateral surfaces, as well provided with a groove-like profiling 8. The rolling body-side groove-like profiling 8 engages in the outer or inner ring side groove-like profilings 6, 7 a. The planetary roller bearing 1 is thus particularly adapted to absorb axial forces.

The planetary roller bearing 1 further comprises cages 9, of which in FIGS. 1-4 each only sections extending radially between radially opposite axial edges of the outer ring 2 and of the inner ring 3 are shown. The cages 9 are provided in known per se with Wälzkör- per receiving areas (not shown), which serve the leadership or storage of the rolling elements 5. In the embodiment shown in Figure 1, the outer ring 2 with a radially completely passing through this Schmiermittelzuführkanal 10 for supplying lubricant, such as. As lubricating oil, provided in the Wälzkörperaufnahmeraum 4 (see, in this context, Figure 5). On the Schmiermittelzuführkanal 10 is a simple lubrication or relubrication of the planetary roller bearing 1 possible.

The lubricant supply channel 10 is arranged axially or centrally, viewed axially, so that a central or centric lubrication or regreasing of the planetary roller bearing 1, in particular with regard to a uniform distribution of a lubricant within the rolling body receiving space 4, is possible. In the outer ring 2, a circumferentially completely circumferential groove 1 1 is incorporated on the outer peripheral side, in which the Schmiermittelzuführkanal 10 opens radially on the outer peripheral side. The groove 11 serves in particular for a circumferential distribution of lubricants introduced into it. The groove 1 1 can therefore be considered or used as an outer ring-side distribution channel for the distribution of lubricant. The geometry of the groove 1 1, d. H. the geometry of the groove flanks or of the groove base, is in this case to a lubricant supply means (not shown), such as. B. a grease nipple of the planetary roller bearing 1 receiving housing part (not shown), adapted so that a preparation of a corresponding lubricant supply means for the purpose of lubrication or relubrication of the planetary roller bearing 1 is easily possible.

It can also be seen that no groove-like profiling 6 is provided in the region of the inner circumference of the outer ring 2, in which the lubricant supply channel 10 opens radially. Accordingly, the region of the inner circumference of the outer ring 2, in which the Schmiermittelzuführkanal 10 opens radially, recessed by a corresponding profiling 6, whereby an integrated into the Planetenwälzlager 1 respectively in the Wälzkörperaufnahmeraum 4 lubricant reservoir or lubricant reservoir 12 is realized, which is the lubrication of Planetenwälzlagers 1 additionally improved.

It can be seen from the embodiment shown in FIG. 2 that a corresponding lubricant supply channel 10 also extends radially through the inner ring 3 can extend. Strichliert is also indicated that appropriate Schmiermittelzuführkanäle 10 may be provided both on the outer ring 2 and on the inner ring 3. Dashed line is further, merely exemplified for the outer ring 2, indicated that a plurality of corresponding lubricant supply channels 10 may be provided in axially adjacent arrangement.

It can be seen from the exemplary embodiment shown in FIG. 3 that a corresponding lubricant supply channel 10 can also be subdivided into a plurality of differently oriented or oriented lubricant supply channel sections 10a, 10b. In this case, an axially extending through the outer ring 2 first Schmiermittelzuführkanalabschnitt 10a is provided, which merges into a perpendicular projecting therefrom, radially extending through the outer ring 2 second Schmiermittelzuführkanalabschnitt 10b. The second Schmiermittelzuführkanalabschnitt 10b opens into the Wälzkörperaufnahmeraum 4. Strichliert is indicated that the second Schmiermittelzuführkanalabschnitt 10b also obliquely, d. H. angularly with respect to the bearing (symmetry) axis A of the planetary rolling bearing 1 inclined, can extend.

As can be seen, the first lubricant supply channel section 10a opens axially into a groove 11 that extends peripherally circumferentially in an axial edge of the outer ring 2. The geometry of this groove 1 1 essentially corresponds to the groove 11 shown in FIGS. 1, 2, which is circumferentially circumferentially formed on the outer peripheral side. On the basis of the embodiment shown in Figure 4 it can be seen that a corresponding Schmiermittelzuführkanal 10 also obliquely, ie angularly with respect to the bearing (symmetry) axis A of the Planetenwälzlagers 1 inclined, can extend through the outer ring 2. The lubricant supply channel 10 extending axially to the left in FIG. 4 extends from an axial edge region of the outer ring 2 to the inner circumference of the outer ring 2. The lubricant supply channel 10 is inclined at an angle α relative to the bearing (symmetry) axis A of the planetary roller bearing 1. In FIG. 4, looking axially further to the right or further in the center, lubricating The feed channel 10 extends from the outer periphery of the outer ring 2 to the inner periphery of the outer ring 2. The Schmiermittelzuführkanal 10 is inclined at an angle ß> α with respect to the bearing (symmetry) axis A of the planetary roller bearing 1.

In principle, all the embodiments of a lubricant supply channel 10 described or shown in connection with the outer ring 2 are analogous to the inner ring 3, and vice versa.

LIST OF REFERENCE NUMBERS

1 planetary roller bearing

2 outer ring

3 inner ring

4 rolling element receiving space

5 rolling elements

6 profiling

7 profiling

8 profiling

9 cage

10 lubricant supply channel

10a lubricant supply passage section

10b Schmiermittelzuführkanalabschnitt 1 1 groove

12 lubricant reservoir

A bearing (symmetry) axis

Claims

Patent claims

Planetary rolling bearing (1), comprising an outer ring (2) with a groove-like profile at least in sections on the inner circumference, an inner ring (3) with a groove-like profile at least in sections on the outer circumference, and a number of rolling body receiving spaces (3) formed between the outer ring (2) and the inner ring (3). 4) arranged rolling elements (5) which are profiled in a groove-like manner on the outside at least in sections, characterized in that in the outer ring

(2) and/or the inner ring

(3) at least one lubricant supply channel (10) for supplying lubricant into the rolling element receiving space

(4) is formed.

Planetary rolling bearing according to claim 1, characterized in that the at least one lubricant supply channel (10) extends radially through the outer ring (2) or inner ring (3).

Planetary rolling bearing according to claim 2, characterized in that the at least one lubricant supply channel (10) extends centrally through the outer ring (2) or inner ring (3) in relation to the axial dimensions of the outer ring (2) and/or inner ring (3).

Planetary rolling bearing according to claim 2 or 3, characterized in that on the outer circumference of the outer ring (2) at least one circumferentially at least partially circumferential groove (1 1) is formed, into which the at least one lubricant supply channel (10) opens radially and / or on the inner circumference of the inner ring (3) at least one circumferentially at least partially circumferential groove (1 1) is formed, into which the at least one lubricant supply channel (10) opens radially.

5. Planetary rolling bearing according to one of the preceding claims, thereby characterized in that in the area of the inner circumference of the outer ring (2) into which the lubricant supply channel (10) opens, no groove-like profiling (6) is provided and/or in the area of the outer circumference of the inner ring (3) into which the lubricant supply channel (10) opens. Channel (10) opens out, no groove-like profiling (7) is provided.

6. Planetary rolling bearing according to one of the preceding claims, characterized in that at least one lubricant supply channel (10), viewed in cross section, extends obliquely through the outer ring (2) or the inner ring (3), at least in sections.

7. Planetary rolling bearing according to one of the preceding claims, characterized in that at least one lubricant supply channel (10) has at least two differently aligned lubricant supply channel sections (10a, 10b), at least a first

Lubricant supply channel section (10a) extends axially through the outer ring (2) or inner ring (3) and at least one second lubricant supply channel section (10b) extends radially through the outer ring (2) or inner ring (3).

8. Planetary rolling bearing according to claim 7, characterized in that on an axial edge of the outer ring (2) at least one circumferentially at least partially circumferential groove (1 1) is formed, into which the at least one first lubricant supply channel section (10a) opens axially and / or an axial edge of the inner ring (3) at least one circumferentially at least partially circumferential groove (1 1) is formed, into which the at least one first lubricant supply channel section (10a) opens axially.

9. Planetary rolling bearing according to one of the preceding claims, characterized in that a plurality of axially, radially or circumferentially distributed lubricant supply channels (10) are provided on the outer ring side and / or inner ring side.