Rolling bearing cage

Description

Field of invention

[0001] The invention relates to a rolling bearing cage with a first side ring and a second side ring, wherein the two side rings are arranged axially spaced apart from each other and wherein a number of webs extend between the two side rings to form a number of receiving pockets for rolling elements corresponding to the number of webs, wherein first and second chamfers extending at an angle to the axial direction are formed on the radially inner surface of the cage in the axial region of the two side rings on the side rings and / or on the webs, the radius of the surface of the chamfers decreasing towards the axial center of the cage, wherein third chamfers extending at an angle to the axial direction are formed on the radially outer surface of the cage in the axial region of one of the two side rings, and wherein the chamfers extend in the axial direction.which is between 10% and 20%, preferably between 12% and 16%, of the width of the cage. Background of the invention

[0002] A rolling bearing cage with the features of the preamble of claim 1 is disclosed in US 3,784,268 A. A seal is attached to one axial end region, which is connected to the cage via a snap-fit ​​connection. The seal prevents lubricant from being injected into the area of ​​the rolling elements.

[0003] Otherwise, reference is made to DE 10 2010 009 331 A1, which shows a cage for a cylindrical roller bearing consisting of two axially supported side rings connected to each other by webs. A tapered roller bearing cage is described in DE 11 2009 001 651 B4.

[0004] JP 2000 320558 A discloses a rolling bearing cage of the type mentioned above.

[0005] Particularly in applications where the bearing needs to rotate very quickly, the previously known cage designs still have disadvantages with regard to good lubrication. Furthermore, the possibilities for injecting oil into the interior of the bearing, i.e., into the area of ​​the rolling elements, are limited. In some cases, this is only possible between the outer ring and the cage.

[0006] Furthermore, the manufacturing process for the cage is sometimes complex and expensive. This is especially true if the cage is to be manufactured from a ring-shaped part through machining. Object of the invention

[0007] The invention is therefore based on the objective of providing a cage for a rolling bearing, in particular for a cylindrical roller bearing, that is especially well suited for use at high speeds. The cage design is intended to facilitate lubrication of the bearing. Furthermore, it should be possible to have a wider selection of locations for oil injection into the interior of the bearing. In addition, a cost-effective and economical manufacturing method for the cage is being pursued. Description of the invention

[0008] The invention solves this problem by providing that the first bevel in the region of the first side ring runs at an angle between 8° and 20°, and the second bevel in the region of the second side ring runs at an angle between 35° and 55°. The first side ring preferably has a smaller radial extent than the second side ring.

[0009] The above-mentioned specification regarding the first and second chamfers means that the chamfers in the area of ​​the two side rings are oriented in opposite directions and decrease in diameter towards the bearing center.

[0010] The cage is preferably designed as an injection-molded part. It is preferably made of polyetheretherketone (PEEK).

[0011] Furthermore, it can be provided that on the radially outer surface of the cage in the axial area of ​​one of the two side rings, a further fourth chamfer is formed on the side rings and / or on the webs at an angle to the axial direction.

[0012] All of the aforementioned slopes are preferably designed as flat flattenings on the side rings or on the webs, which run at an angle to the axial direction of the cage in radial section.

[0013] The third and fourth bevels are preferably arranged in the same direction on the side rings and / or on the bridges - in contrast to the first and second bevels.

[0014] As already mentioned, a further training stipulates that the first side ring has a smaller radial extent than the second side ring.

[0015] The cage is preferably a component of a cylindrical roller bearing.

[0016] The proposed cage is particularly advantageous for cylindrical roller bearings that rotate at very high speeds during operation. A particularly preferred application is a spindle bearing arrangement where cylindrical roller bearings with the described cage are used.

[0017] Preferably, oil injection is provided in the area of ​​the rolling elements in order to maintain optimal operating conditions.

[0018] A cylindrical roller bearing equipped with the described cage can be operated at high speeds, ensuring high precision and robustness.

[0019] If the cage is manufactured by injection molding, as is preferred, rapid and cost-effective production is possible. The aforementioned angled surfaces facilitate the manufacturing process. Up to now, as mentioned above, cages of this type have often been manufactured by machining (turning and milling) from a ring-shaped blank made of... PEEK This machining process requires a long cycle time and is therefore costly. Injection molding eliminates these disadvantages, with the integrated slopes ensuring particularly advantageous demolding of the cage from the injection mold.

[0020] The proposed concept allows for an increase in rotational speed of up to 20% compared to previously known solutions.

[0021] Furthermore, it advantageously allows for greater freedom in lubricant injection. While previously it was often only possible to inject the lubricant between the inner ring and the cage or between the outer ring and the cage, the inventive design, with its described inclined surfaces, now offers injection possibilities in both the outer and inner ring regions. Inclined injection, particularly at the inner ring, is also possible. The inclined surfaces act as reflective or guiding surfaces, facilitating the introduction of the lubricant (oil) into the interior of the bearing, i.e., to the rolling elements.

[0022] The injection circuits are modified accordingly compared to the previously mentioned known solution. In particular, angled injection becomes possible with a relatively large axial displacement. The angled sections provided according to the invention thus ensure a higher degree of flexibility in the injection of lubricant (oil). Brief description of the drawings

[0023] A preferred embodiment of the rolling bearing cage designed according to the invention is explained in more detail below with reference to the accompanying drawings. These show: Figure 1 shows a radial section of a cylindrical roller bearing with a cage designed according to the invention, Figure 2 shows the radial section through the cage according to the invention. Figure 1 , showing a section in the area of ​​a recording pocket, and Figure 3 in perspective showing part of the cage. Detailed description of the drawings

[0024] In Figure 1Figure 11 shows a radial section of a cylindrical roller bearing, which has an inner ring 12 and an outer ring 13, between which cylindrical rollers 6 are arranged. The cylindrical rollers 6 are held in place by a bearing. fig 1 led. The cheese fig 1 has a special design, as can be seen from the combination with the other Figures 2 and 3 results.

[0025] In a manner initially known, the cheese fig 1 A first side ring 2 and a second side ring 3 are arranged at a distance from each other in the axial direction a. The connection between the two side rings 2 and 3 is effected by webs 4. The side rings 2 and 3, as well as two adjacent webs 4, define a receiving pocket 5 for a cylindrical roller 6.

[0026] As can be further seen from the figures, on the radially inner surface of the cheese figs 1Specifically, in the axial region of the two side rings 2 and 3, respectively, chamfers are provided on the side rings 2 and 3 and on the webs 4, namely a first chamfer 7 and a second chamfer 8. The first chamfer 7 is located on the first side ring 2 and extends over the entire circumference of the side ring 2. The second chamfer 8 is located on each of the webs 4. The first chamfer 7 and the second chamfer 8 are oriented in opposite directions to each other, i.e., towards the axial center M of the Kä. figs 1 The radius of the surface decreases along the respective slope.

[0027] As especially from Figure 2 As can be seen, the radial extent (in direction r) of the first side ring 2 is less than that of the second side ring 3. In combination with the described first and second chamfers 7 and 8, this results in a favorable injection possibility for lubricating oil into the area of ​​the receiving pockets 5.

[0028] In the exemplary embodiment, the angle α of the first slope 7 is approximately 13°. The angle β of the second slope 8 is approximately 45°.

[0029] In the exemplary embodiment, the extension of the first and second inclined planes 7, 8 in the axial direction a is approximately 12% to 15% of the width B of the chevron. figs 1 .

[0030] As can be further seen, additional chamfers are also arranged in the radially outer region of the side rings 2, 3 and the webs 4, namely a third chamfer 9 and a fourth chamfer 10. The third chamfer 9 preferably runs at an angle γ to the axial direction a, which is between 15° and 25°. The fourth chamfer 10, meanwhile, preferably runs at an angle δ to the axial direction a, which is between 35° and 55°. As can be seen from Figure 2 This also results in the first inclined planes 7 and the third inclined planes 9 being oriented such that in the radial section of the cage, as shown in Figure 2As shown, a pointed or arrow-shaped axial end region of the side ring 2 is formed.

[0031] The described cage is preferably used in a cylindrical roller bearing, which is intended for high-speed use in a spindle.

[0032] The arrangement of the described inclined surfaces enables flexible injection of lubricating oil into the interior of the bearing, i.e., into the area of ​​the receiving pockets 5 or the rolling elements 6. Reference symbol list

[0033] 1. Roller bearing cage (cylindrical roller bearing cage) 2. First side ring 3. Second side ring 4. Web 5. Mounting pocket 6. Rolling element (cylindrical roller) 7. First chamfer 8. Second chamfer 9. Third chamfer 10. Fourth chamfer 11. Roller bearing (cylindrical roller bearing) 12. Inner ring 13. Outer ring aaxial direction radial direction maxial center of the cage B width of the cage α Angle of the first slope 7 β Angle of the second slope 8 γ Angle of the third slope δ Angle of the fourth slope

Claims

1. A rolling bearing cage (1) having a first side ring (2) and a second side ring (3) spaced in the axial direction (a) therefrom, between which webs (4) extend, which form a number of receiving pockets (5) for rolling elements (6) corresponding to the number of webs (4), wherein first and second inclines (7, 8) are formed on the radially inner surface of the cage (1) in the axial region of the side rings (2, 3) on the side rings (2, 3) and / or on the webs (4), extending at an angle (α, β) to the axial direction (a), wherein the radius (r) of the surface of the inclines (7, 8) decreases towards the axial centre (M) of the cage (1) and wherein third inclines (9) are formed on the radially outer surface of the cage (1) in the axial region of one of the side rings (2, 3) on the side rings (2, 3) and / or on the webs (4), extending at an angle (γ) to the axial direction (a), characterised in that the inclines (7, 8, 9) have an extension in the axial direction (a), which is between 10% and 20%, preferably between 12% and 16%, of the width (B) of the cage (1), wherein the first incline (7) in the region of the first side ring (2) extends at an angle (α) between 8° and 20° and the second incline (8) in the region of the second side ring (3) extends at an angle (β) between 35° and 55°.

2. The cage (1) according to claim 1, characterised in that it is designed as an injection-moulded part.

3. The cage (1) according to claim 1 or 2, characterized in that it is made of polyetheretherketone (PEEK).

4. The cage (1) according to any one of claims 1 to 3, characterised in that further fourth inclines (10) are formed on the radially outer surface of the cage (1) in the axial region of one of the two side rings (2, 3) on the side rings (2, 3) and / or on the webs (4), extending at an angle (δ) to the axial direction (a).

5. The cage (1) according to claim 4, characterized in that the third and fourth inclines (9, 10) are arranged in the same direction on the side rings (2, 3) and / or on the webs (4).

6. The cage (1) according to any one of claims 1 to 5, characterized in that the first side ring (2) has a smaller radial extension than the second side ring (3).

7. The cage (1) according to any one of claims 1 to 6, characterised in that it is a cylindrical roller bearing cage.