WO2012031835A1

WO2012031835A1 - Lubricating oil supply device for a rolling bearing

Info

Publication number: WO2012031835A1
Application number: PCT/EP2011/063330
Authority: WO
Inventors: Bernhard Jakob; Stefan Kleiber; Christian SCHÄFER
Original assignee: Schaeffler Technologies Gmbh & Co. Kg
Priority date: 2010-08-21
Filing date: 2011-08-03
Publication date: 2012-03-15
Also published as: DE102010035058A1

Abstract

The invention relates to a lubricating oil supply device for a rolling bearing with at least one bearing ring (2) or the like forming a raceway (4) for the rolling bearings, comprising an oil duct (22) which passes through the bearing ring, is connected to an oil feed line and opens into the interior of the bearing, and a metering device (6) arranged upstream of the oil duct in the feeding direction of the lubricating oil. The metering device (6) comprises two intersecting oil guiding ducts (8, 10) or the like, of which at least one is connected to the oil feed line, and of which one is connected to the oil duct (22), wherein, in the intersecting region of the two oil guiding ducts (8, 10), a blocking body (12) is fixedly arranged and shaped in such a manner that said blocking body partially bears against an intersecting curve (28), which is assigned to the oil duct (22), of the two oil guiding ducts, i.e. with a defined passage gap being subjected to a load.

Description

Name of the invention

Lubricating oil supply device for a roller bearing Description

Field of the invention

The invention relates to a lubricating oil supply device for a rolling bearing having at least one bearing for the rolling elements forming bearing ring or the like, comprising a bearing ring passing through, connected to an oil supply line and opening into the bearing interior oil passage, and arranged in the feed direction of the oil in front of the oil passage metering device. The term "bearing ring or the like" basically also includes a component provided with a track of the environmental structure of the bearing, for example a housing or a shaft.

BACKGROUND OF THE INVENTION A lubricating oil supply device of the abovementioned type should be able to supply, in particular, high-speed rolling bearings with a lubricating oil quantity which is precisely matched to the lubricating oil requirement, in order, for example, to avoid unnecessary consumption of lubricating oil, churning losses and the like (minimum quantity lubrication). Preferably low-viscosity lubricating oils are used, so that a risk of clogging and a temperature dependence of the function of the device are very low. The metering device arranged in the oil feed path to the rolling bearing can only pass the amount of oil, which is generally very small, which corresponds to the lubricating oil requirement. These are, for example, lubricating oil flows in the effective order of magnitude of 0.1 to 100 μΙ / h, which are to be distributed over as many supply cycles as possible with small intervening pauses. Further requirements for lubricating oil supply devices of the above type are a simple, functionally reliable and space-saving design to integrate the metering device, for example, directly in the bearing ring, as well as avoiding idling of the lubricating oil supply device in the cycle breaks. From DE 694 33 065 T2, a lubricating oil supply device of the type mentioned in the preamble of claim 1 is already known, in which the downstream of a lubricating oil pump metering device is formed for example as an externally controlled valve, which is opened from time to time. Such an arrangement is structurally and structurally very complicated, in particular because of the required control and the high demands on the switching speed of the valve, and requires a relatively large installation space.

OBJECT OF THE INVENTION It is the object of the invention to provide a lubricating oil supply device of the type mentioned in the preamble of claim 1 with a metering device which is structurally and structurally simple and requires a small installation space. Summary of the invention

The invention is based on the finding that structurally simple solutions can be achieved via simple machining operations, such as, for example, turning or drilling operations, and the use of simple, marketable components, such as, for example, balls, cylinders or the like.

The invention is therefore based on a lubricating oil supply device for a rolling bearing with at least one raceway for the rolling elements forming bearing ring or the like, comprising a bearing ring passing through, connected to an oil supply line and opening into the bearing interior Ölka- channel, and in the feed direction of the lubricating oil before the metering device arranged the oil passage. It is provided according to the invention that the metering device tion comprises two intersecting oil guide channels or the like, at least one of which is connected to the oil supply, and one of which is in communication with the oil passage, and that in the intersection of the two oil guide channels a locking body is arranged and fixed and shaped so that he partially at a the oil passage associated Verschneidungskurve the two oil guide channels, that is under load of a defined passage gap. The term "oil guide channels" are any structures to understand that can lead to lubricating oil. The metering device can be arranged, for example, in the bearing ring itself, in which case the oil drain of this metering device is in communication with the oil channel or merges into it. But it can also be arranged in the bearing ring receiving the surrounding structure or in a separate, the bearing associated housing, wherein the oil drain of the metering device is in turn connected to the oil passage of the bearing.

The intersection of the two oil guide channels forms a specific, given by the geometry of these oil guide channels spatial intersection curve. The voltage applied to this intersection curve blocking body is chosen in terms of its size and shape so that its outer contour does not conform to all sides of the Verschneidungskurve, but leaves defined passage gaps, which then pass with continuous or discontinuous oil supply a defined amount of oil. When intersecting two holes of different diameters, for example, a Verschneidungs- curve that does not follow a spherical surface, so that it meets the above conditions in conjunction with a ball as a locking body.

Thus, it is provided in a particularly simple embodiment of the invention that the oil guide channels are formed as intersecting holes, preferably a first bore has a smaller diameter than the second bore crossing them, and wherein the locking body is a ball with a the Inner diameter of the second, larger bore substantially corresponding outer diameter.

The ball is placed on a cross-section of the two boreholes, leaving an approximately crescent-shaped gap. The holes intersect, for example, at a right or a different angle. The holes can be produced with extremely simple machining operations. The ball is inserted into the second bore and brought to the intersection curve by suitable means.

According to a preferred embodiment of the invention, the first bore is formed as a bearing bore from the outer circumference to the bearing interior radially passing through hole and radially outwardly closed by a sealing plug, and the second bore is formed as gerger in an end face of the bearing blind bore and the input side equipped with a connecting piece for connection to the Olzuführleitung, wherein the ball is pressed by a spring supported on the sealing plug on the Verschneidungskurve. The spring is designed so that it presses the ball securely against the intersection curve under all operating conditions and in all mounting positions.

According to another favorable embodiment of the invention, it is provided that one of the oil guide channels is designed as an annular groove arranged in one end face or peripheral surface of the bearing ring and connected to the oil feed line, and that the other oil guide channel is formed by a bore passing through the bearing ring, on the one hand cuts the annular groove and on the other hand is in communication with the oil passage and passes into this. The annular groove itself is in turn connected to the Olzuführleitung in connection, so that the lubricating oil enters via the Olzuführleitung in the annular groove and from there via the bore in the oil passage, which opens into the bearing interior. The bore and the oil passage can merge into one another or form a single bore extending from the annular groove to the bearing bore, as an exemplary embodiment shows. In this described embodiment of the invention, the locking body may be formed, for example, as a resting on the Verschneidungskurve between the annular groove and bore, clamped in the annular groove plate.

In order to prevent emptying and outflow of lubricating oil in breaks between Zuführzyk- len, it is provided according to a further embodiment of the invention that in the Ölzuführweg the device is arranged a blocking in one of the feed direction blocking check valve. This check valve may be arranged in the feed direction in front of or behind the metering device.

Instead of a check valve, according to another embodiment of the lubricating oil supply device invention may be provided that in the Ölzuführweg the lubricating oil supply means a blocking constriction is provided by capillary forces a backflow of the lubricating oil against the Zuführ- direction, an idling of the device and / or a subsequent flow of the lubricating oil Gravity influence prevents ..

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be explained in more detail below on the basis of the attached drawing of some embodiments. It shows

1 schematically shows a partial longitudinal section through an outer bearing ring with an integrated therein, formed of two intersecting bores dispensing device, 2 is a view similar to FIG. 1 with a different arrangement of the holes,

3 shows a partial longitudinal section through an outer bearing ring with an annular groove formed as an opening and formed as a bore, and

4 shows a partial cross section through the metering device according to FIG. 3. DETAILED DESCRIPTION OF THE DRAWINGS FIG

Fig. 1 thus shows schematically a partial longitudinal section through the outer bearing ring 2 of a ball bearing with a raceway 4 for the balls, not shown, serving as rolling elements.

Integrated into the outer bearing ring 2 is a generally designated by the reference numeral 6 metering device, which consists essentially of two intersecting oil guide channels 8 and 10 and a arranged in the intersection of these two oil guide channels locking body 12. The first Ölführungska- channel 8 is a the bearing ring 2 from the outer periphery 14 to the bearing inside radially passing through hole 16, and the second oil guide channel 10 is an introduced into an end face 18 of the bearing ring 2 blind bore 20 which crosses the through hole 16 at right angles. The through hole 16 merges into the opening into the bearing oil passage 22.

As a blocking body 12 is a ball 24 which is pressed by a spring 26 to the oil passage 22 associated with the intersection curve 28. The spring is supported on a closure plug 30 which closes the oil guide channel 8 radially outward.

As can be seen from FIG. 1, the through bore 16, which is also referred to here as the first bore, has a smaller diameter than that which crosses it, than two The diameter of the smaller-diameter through-hole 16 has a value between 20% and 99% of the diameter of the larger diameter blind bore 20. The outer diameter of the ball 24 substantially corresponds to the inner diameter of the blind bore 20, so that they are inserted into this exact fit, but can not fall into the through hole 16.

The blind bore 20 is equipped on the input side with a connecting piece 32 for connection to an oil feed line, not shown. Oil is supplied continuously or discontinuously via the oil supply line, which oil reaches the bearing interior in a defined quantity via the passage gaps remaining between the ball 24 and the intersecting curve 28 and the oil passage 22. The passage column ideally has only a few micrometers at its widest point, for example between 1 μm and 200 μm.

Although the passage column according to the intersection curve 28 always remains the same size during operation, the proposed construction advantageously avoids the production of a through-bore 16 with such a small passage cross-section as the passage column forms. In other words, the proposed metering device can be inexpensively manufactured with bores of comparatively large diameter, since the very small passage cross section is produced by means of the blocking body 12, 24.

A further advantage of the small passage cross-section formed by means of a blocking body is the fact that the risk of clogging is lower because of the greater extent of expansion than in the case of a capillary or a diaphragm.

In order to prevent lubricating oil supplied to the bearing from running back, for example during cycle pauses, a non-return valve 34 blocking the direction of supply in the through-bore 16 is arranged or formed. As already explained above, such a non-return valve can also be located at any other point in the oil supply path of the inlet. be arranged direction. In addition to the described running back of the lubricating oil and the idling or the post-flow of the lubricating oil by gravity in the lubricating oil supply device is advantageously prevented. Fig. 2 shows an arrangement similar to that in Fig. 1, but with a first, formed as a through hole 35 Olführungskanal 36 has a larger diameter than this crossing, designed as a blind bore 37 second Olführungskanal 38. The ball 41 serving as a blocking body 40 substantially corresponds in its outer diameter to the inner diameter of the passage bore 35, which is closed by a closing stopper 42 after insertion of the ball 40. The ball 40 is pressed by a spring 44, which is supported on the bottom of the blind bore, facing away from the spring 44 intersection curve 46 between the through hole 35 and the blind bore 37, which form again defined passage gaps between the ball 40 and the intersection curve 46.

Figures 3 and 4 show schematically an outer bearing ring 48 of a rolling bearing, in which a first Olführungskanal 50 is formed as incorporated in an end face 52 annular groove 51 which intersects with a second Olführungskanal 54, which merges into the opening into the bearing oil passage 56. As the figures show, the second Olführungskanal 54 and the oil passage 56 form a single, the bearing ring 48 from the annular groove 50 through to the bearing interior passing hole. As a blocking body is shown in Fig. 4, clamped in the annular groove 50 plate 58, which abuts the Verschneidungskurve 60 between the annular groove 50 and the Olführungskanal 54, leaving passage gaps.

The annular groove 50 is suitably connected to an oil supply line, not shown, formed, for example, in an environmental structure receiving the bearing, but may in each case also be formed in this surrounding structure. LIST OF REFERENCE NUMBERS

2 outer bearing ring

4 career

6 metering device

8 Olführungskanal

10 Olführungskanal

12 locking bodies

14 outer circumference

16 through hole

18 front side

20 blind hole

22 oil channel

24 ball

26 spring

28 Intersection curve

30 sealing plugs

32 connecting pieces

34 check valve

35 through hole

36 First oil duct

37 blind hole

38 Second Olführungskanal

40 locking bodies

41 ball

42 sealing plugs

44 spring

46 Intersection curve

48 Outer bearing ring

50 First oil duct

51 ring groove front

Second Olführungskanal oil channel

plate

Verschneidungskurve

Claims

claims

Lubricating oil supply device for a rolling bearing having at least one bearing ring (2) or the like forming a raceway (4) for the rolling bodies, comprising an oil channel (22) passing through the bearing ring (2) and connected to an oil supply line and opening into the bearing interior, and a metering device (6) arranged in the feed direction of the lubricating oil in front of the oil passage (22), characterized in that the metering device (6) comprises two intersecting oil guide channels (8, 10) or the like, at least one of which is connected to the oil feed line, and one of which is in communication with the oil passage (22), and in that in a intersection region of the two oil guide channels (8, 10) a locking body (12) is arranged and fixed and shaped to be associated with the oil passage (22) Verschneidungskurve (28) of the two oil guide channels (8, 10) partially, so under load of a defined passage gap abuts t.

Lubricating oil supply device according to claim 1, characterized in that the two oil guide channels (8, 10) are formed as intersecting holes.

Lubricating oil supply device according to claim 2, characterized in that a first bore (16) has a smaller diameter than the second bore (20) intersecting the latter, and in that the locking body (12) has a ball (24) with an inner diameter of the second bore (20 ) is substantially corresponding outer diameter.

Lubricating oil supply device according to claim 3, characterized in that the first bore formed as a bearing ring (2) from the outer periphery to the bearing interior radially passing through hole (16) and radially outward by a sealing plug (30) off. is closed, and that the second bore is formed as in a front side (18) of the bearing ring (2) introduced blind bore (20) and on the input side with a connection piece (32) for connection to the Ölzuführlei- device, wherein the ball (24) by a on the closure plug (30) supporting spring (26) is pressed against a Verschneidungskurve (28).

Lubricating oil supply device according to claim 1, characterized in that one (50) of the oil guide channels as one in an end face (52) or the peripheral surface of the bearing ring (48) arranged, connected to the oil supply line annular groove (51) is formed, and that the other Oil guide channel (54) merges into the oil passage (56) passing through the bearing ring.

Lubricating oil supply device according to claim 5, characterized in that the locking body as on the intersection curve (60) between the annular groove (51) and the second oil guide channel (54) resting, clamped in the annular groove plate (58) is formed.

Lubricating oil supply device according to one of claims 1 to 6, characterized in that in the Olzuführweg the device is arranged in a direction opposite to the feed direction blocking check valve (34).

Lubricating oil supply device according to one of claims 1 to 6, characterized in that in the Olzuführweg the device a blocking constriction is provided which prevents by capillary forces a backflow of the lubricating oil against the feed, emptying of the device and / or a subsequent flow of the lubricating oil by gravity.